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Патент USA US3068859

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Dec. 18, 1962
R. H. THORNER
3,068,849
SPEED REGULATING MECHANISM
Filed May 22, 1959
38
)
50
36
/
62
IN VEN TOR.
£05527 6.’ imp/v52
BY QM
United States Patent O??ce
3,068,849
Patented Dec. 18, 1962
1
2
3,663,849
combination of elements set forth in the following de
tailed description, de?ned in the appended claims and
SPEED REGULATH‘JG MEQHANISM
Robert H. Thomer, 19754 Monte ‘Vista, Detroit 21, Mich.
Filed May 22, 1959, Ser. No. 815,177
31 Claims. ((11. 123-103)
The present invention relates to speed regulators, par
ticularly but not necessarily, for automotive engines, and
is particularly directed to novel ?uid servo~mechanisms.
The present application is a continuation-in-part of
my applications, Serial No. 754,736, ?led August 13,
1958, entitled “Engine Governor” (now Patent No. 2,887,
999); Serial No. 743,542, ?led June 23, 1958, entitled
“Fluid Powered Governor”; and Serial No. 683,318, ?led
September 11, 1957, entitled “Fluid Pressure Sensing 15
Governor.”
In regulators having a ?uid servo-motor controlled by
a pilot valve, such as speed regulators, the elimination of
undesirable ?uid static and dynamic forces acting on the
valve has always been a puzzling problem. This prob
lem is signi?cant in modulating type pilot valve struc
tures, and is most severe in the environment of the single
acting type servo-motor. When a “closed-loop” regula
tor is responsive to a controlled condition, it is usually
desirable for the pilot valve to respond to changes in the
illustratively exempli?ed in the accompanying drawings,
in which:
FIG. 1 is a schematic view of one form of speed regula
tor embodying the present invention operatively related
to a carburetor and engine manifold or intake;
PEG. 2 is a schematic view similar to FIG. 1, showing
modi?ed means for compensating for variations in the
source pressure of a ?uid-servo type regulating device;
and
FIG. 3 is a modi?ed form of the servo-mechanism
shown in F168. 1 and 2 in which the novel constant force
pilot valve is illustrated in a double acting servo-motor. ‘
Referring to FIG. 1, a speed regulator 1 for an auto
motive vehicle is shown to illustrate the concepts of the
present invention. In FIG. 1 there is shown a conven
tional carburetor 16 in an engine intake passage or mani
fold l1 and including a throttle 12 with a lever 13,
operated by an accelerator 14 through a linkage 16, all‘
biased towards an idle speed direction by an idle spring
18. The lever 13 and throttle 12 are operated by the
regulator by means of an override member 20 having a
slot 22 cooperating with a pin 24 carried by lever 13.
The override member 2a is actuated by a servo-motor
controlled condition substantially independent of static
such as diaphragm 24, or the like, having atmospheric
in the preceding paragraph, and which compensating
spectively.
pressure on one side thereof in chamber 26 and modu
and ?uid dynamic forces acting on the valve.
lated vacuum on the other side in chamber 28. The
The disturbing or unbalancing ?uid forces acting on a
vacuum-derived force of diaphragm 24 is biased or op
pilot valve, as above discussed, are produced by at least
posed by a spring 30 which tends to close the throttle 12
two basic factors. One important factor is the variation
when the regulator is in operation. The vacuum in
in the source pressure acting on the pilot valve, particu
chamber 28 is modulatingly controlled by a pilot valve
larly when such variation is signi?cant in relation to the
32 supported for frictionless movements by a pair of leaf
sensing or signal forces which actuate the pilot valve.
springs 34 and 36 suitably secured to a body 38. The
Another factor, for a constant value of the source pres
pilot valve controls a ?uid circuit in which air ?ows
sure, comprises the two ?uid force variations acting on
through an inlet 40 into an atmospheric chamber 42,
the pilot valve as the valve travels throughout its operat
through
an inlet ori?ce or restriction 44, a Valve chamber
ing range; one of these ?uid force variations comprises
46, an outlet ori?ce or restriction 48, vacuum chamber
the changes in force produced by the static pressure act
5%}, and through a passage 52 to the intake manifold 11.
ing on the uncompensated but varying area of the pilot
<10
The pilot valve, in the form shown, includes a cylin
valve which is exposed to the source pressure; the second
drical valve face 58 which cooperates with a conical valve
of these force variations is the ?uid dynamic (Bernoulli)
seat 56 to comprise the inlet valve for chamber 46. The
elfect produced on the pilot valve by the changing velocity
pilot valve also includes a conical valve face 60 which
of the controlled ?uid as the valve changes its travel
cooperates with a cylindrical valve seat 62 of ori?ce 48
position.
45 to comprise the outlet valve for chamber 46. The pres~.
A principal object of the present invention is to pro
sure in chamber 46 is transmitted to chamber 28 through,
vide a ?uid servo-type regulating device, such as a speed
a passage 64 so that the pressure in chamber 46 is sub->
regulator, including a pilot valve, in which novel means
stantially the same as in chamber 28. When the pilot
are provided to compensate for variations in the source
valve moves from the seated inlet valve position to the
pressure acting on the pilot valve.
50 seated outlet valve position, the pressure in chambers 46‘
Another object of the present invention is to provide
and 28 varies gradually from the value of pressure in
a speed regulator for an internal combustion engine,
chamber 50 to the value of pressure in chamber 42, re
which includes the novel compensating means mentioned
A small compensating disc 66 is secured to an exten-;
means is utilized in cooperation with the variation in
sion of the pilot valve by suitable means, as by soldering.
engine vacuum resulting from changes in the throttle
The disc is disposed within a bore of a housing member
opening to provide any desired speed—droop or regulation.
68 to provide a small perimetrical clearance therebetween,
Another object of the present invention is to provide a
such as .004" to .006" diametrically, for example. Such
speed regulator for an internal combustion engine of the
clearance is maintained by the leaf springs 34 and 36 to'
type described in the preceding paragraph in which the 60 provide
frictionless movement of the entire pilot valve
elements of the combination are arranged to produce
assembly since the elements thereof are suspended within;
greater stability than otherwise obtained.
the ?uid controlled thereby without any sliding surface
Another object of the present invention is to provide
contact. The manifold vacuum in chamber 50 and pas-1
a pilot valve in a ?uid servo-type regulating device, in
sage 52 causes air to ?ow through the inlet 70 into chaml
which the con?guration of the pilot valve and its seating
her 72, through the small clearance between disc 66 and
members compensate for or eliminate the variations of
bore 63 where it joins the ?ow through the pilot valve,
the ?uid static and dynamic forces acting on the pilot
the combined air-?ow then passing through passage 52‘
valve throughout its travel, by maintaining a constant
to intake passage 11.
,
Frictionless speed-sensing means are provided to effect
force acting on the pilot valve.
These and other objects which will appear more clearly 70 movements of the pilot valve in response to changes in‘
the speed of the engine or vehicle. In the form shown,
as the speci?cation proceeds, are accomplished, accord
such speed-sensing means includes a sensing diaphragm
ing to the present invention, by the arrangement and
3,068,849
'
s‘)
74 which produces forces acting on the pilot valve in
response to pressure in a chamber 7 6 varying as a function
of vehicle (or engine) speed in a manner to be described.
droop which produces violent surging of the engine. This
surging action is prevented by the compensating disc 66.
For a constant value of any working ?uid, such as
The forces of diaphragm 74 are opposed and ‘balanced by
a, biasing spring 78 which is manually adjusted by a shaft
manifold vacuum, the static unbalance force acting on
the exposed area of a pilot valve of any ?uid-servomecha
80.
The ‘frictionless speed-sensing means also includes a
' signal unit or pressure generator unit, shown by way of
nism may vary throughout its travel, since the e?‘ective
exposed area varies. Similarly, ?uid-dynamic forces
illustration, which is generally indicated by the numeral
servomechanism by the ?ow of the working ?uid, past
(Bernoulli forces) are produced on a pilot valve of any
82 and produces the pressure in chamber 75 which varies 10 the valve; and such ?uid-dynamic forces sometimes vary
as a function of speed, in this instance. The signal unit
undesirably as the pilot valve travels through its range.
is of the same type as disclosed in my ‘co-pending appli
I have found that the con?guration of the pilot valve and
cation, Serial 'No. 683,318, ?led September 11, 1957.
its seats in the servomechanism illustrated in FIG. 1 pro
duces a net total of static and dynamic ?uid forces which
used, this signal unit has particular utility in the regulator 15 remains substantially constant throughout the travel range
combination shown in FIG. I, particularly whenused as
of the pilot valve. This desirable result is obtained by
an “automatic. throttle” for substantially constant speed
the cylindrical valve face and conical seat for the inlet
operation of automobiles. This type of signal unit com
valve, and the conical valve face and cylindrical seat for,
prises a rotary vane member 84 driven ‘by the vehicle
the outlet valve. Thus, with this constant-force pilot valve "
or engine, such as by the ?exible speedometer shaft (not
construction, there is substantially no variation in the
shown), and having one or more vanes for moving liquid
unbalancing ?uid forces so that the pilot valve is respon- '
86 in a circular path in a cylindrical housing 88. The
sive substantially solely to the signal changes, which in
liquid is supplied from an air-vented reservoir 89 through
the example shown in vehicle speed. 7
passage .90 to a vane chamber inlet }tla located near the
It is important to appreciate that both of, the foregoing _'
While any of my frictionless speed-sensing means may be
j center of the vane chamber.
Liquid pressure developed 25 two features, (1) disc compensation for source-pressure
by the centrifugal force of the revolving liquid is trans
mitted to the diaphragm 74 by means of a pressure con
verter or transmitter chamber 91 through a body of air
trapped in a passage 94 between the liquid in the, trans
mitter chamber and the sealed sensing diaphragm 74.
Rotation of the vane element 84 at a faster rate produces
more centrifugal force of the revolving liquid and hence
more air pressure on’ diaphragm 74, and conversely.
, A valve member 243 is slidable in a cylinder 241 to
variation and (2) constant force pilot valve, are applicable
to any kind of ?uid servomechanism using any kind'rof
?uid, such as air or liquid, in response to any kind'or
7 condition of a signal, such as speed, temperature, pressure, ‘
velocity, level, attitude, humidity, etcr
,
However, the combination of elements comprising’the
automotive speed regulator shown in FIG. lhas particu
lar utility in cooperation vwith an internal combustion en;
ine having a throttle in an intake passage. If the speed ,
open and close passage 52 for activating or inactivating 35 droop of the regulator of FIG. 1 is too broad, then the _
the regulator as required. The valve 243 is actuated in
a closing direction by a ?exible shaft 244 sliding in a
sheath 246 in response to movements of the brake actu
ating mechanism (not shown). The valve 243 is opened
by hand-operated means to activate the governor mecha
nism. The structure and operation of this valve mecha
nism is disclosed in more detail in my co-pending appli
' ‘cation, Serial No. 712,847, ?led February 3, 1958, and
corresponding elements are indicated by the same nu
merals; also, this reference application discloses, a more,
' detailed operation of the override member 216 in relation
to throttle 12.
'
7 When the; rotary speed of the vehicle and vane men‘..- '
area of the disc 66 is made slightly smaller (as illustrated)
than the exposed area of the pilot valve at ori?ce 48.
Then, as the speed increases to move the pilot valve right
Wardly as above described, the resulting reduced throttle,
opening increases the throttle vacuum.
Since the ex
posed valve area is slightly larger than the disc, the pilot
valve is moved slightly more to the right which effects
slightly more throttle closure, which in turn, reduces the . p
speed droop. I have found that the regulator corrected j, "
in this manner will remain stable even with isochronous
regulation._ '1 have also encountered a situation’in which
the speed droop was reverse or negative when the disc
and exposed valve area were. equal; This might have
her 84 increases, diaphragm 74 applies more force on
been produced ‘by severe aerodynamic'forces on the throt
pilot valve, 32 which then moves towards'the right in 50' tle 12. In this instance, the disc area is made slightly
FIG. 1 to increase the opening of the inlet valve at ori?ce
" larger than the exposed
area of the pilot valve. Then
5
44 and simultaneously and gradually decrease the open
whenthe speed’increases and the pilot valve moves to a’ _
ing of the outlet valve at ori?ce 48. ' This action de
position to. the right, the throttle opening reduces to in
creases the vacuum in chambers 46 and 28 so that spring
crease the manifold vacuum, but since. the area of the ,
‘30, moves throttle 12 in_a.closing direction tending to 55 :disc is slightly larger than the exposed area of the pilot' '
restore the regulated speed. When the vehicle (or en
valve in this instance, the increased vacuum causes the .
1 gine) speed decreases, the regulating action is the I‘e- ‘ valve to assume aposition slightly; to the left of its posi-,
verse of that above described.
‘
'
. .
Y
.
tion with a balanced disc. Hence, with this construction,
The disc 66 is subjected to the same vacuum existing
the throttle, 12 does not close as much when the engine
in chamber 5!) as the area of the pilot valve exposed
load decreases. .This' transposition of the pilot valve in-'
through ori?ce 48. If the area of the‘ disc’ is’ substanp
creases progressively, as the throttle closes. (and vacuum.
tially ,equal to this'rexposed valve area, then the force
increases) which tends to decrease the negative droop.
,duerrto any vacuum: in chamber 50 acting on the'valve,
The disc area is Worked outl'so that at least isochronous
is. opposed and balanced by the force of the vacuum act-. ' regulation is obtained at which point the governor'is
a ' ing on the disc, ‘In this manner the pilot-‘valve is. made , 65
7' s'ubstantiallyindependent of the variations of manifold
'_ ~yacuurn produced by changes in throttle’ ‘position and
_: (acting on the pilot valve. ,Without the disc’ 66, when
" the pilot valve moves towards tlie'right as' the speed in- I
'creases, .the opening of throttle 12 reduces which iii-~70
creases the vacuum acting on-the pilot valve. This 'in' crease inf‘throttle” vacuum causes the pilot valverto move
even more to‘ the right which further closes the throttle,
~ 12, which further increases the vacuum 011 the pilot valve,
,stable;¥if, inthis instance, the disc area is madeiprogres
s'ively larger, then any desired positive droop can be ob
tained; Thus, by proper sizing, of the disc 66, substan
tially any’ desired speed (droop may be obtained byithis
“reset” action, regardless of any disturbing factors.
, 7
The particular‘ form of theregulator shownin FIG. 1;
has further utility in cooperation with an internal'com- .f
bustion engine, having a' throttle in the air intake manifold
to produce unusually stable regulation. Such stability is’
achieved because of the single-acting servomotor con-7
and so on." This condition results in a severe reversespeed 75 struction shown in FIGQI. in cooperation with the balanc‘
'
3,068,849
5
ing action of the disc 66 and the air pumping character
istics of the engine. In FIG. 1, the servomotor spring
30 tends to close the throt?e and the modulated vacuum
acting on diaphragm 24 tends to open the throttle. While
the regulator mechanism is in operation, for any?xed
pilot valve position, if the throttle suddenly moves slightly
open for any reason, the vacuum in chamber 59 reduces
slightly; as a result the vacuum in chambers 46 and 28
6
symmetrically arranged in relation to the valve body 32
for simultaneous and opposite control of similar ori?ces
48a and 44a in a branch circuit from the inlet 40”‘ to
the outlet 52°. The valve body 32a controls the pressure
in chamber 122 through passage 64a to vary oppositely
from that in chamber 120. Either pressure-?uid can be
supplied to passage 40EL or vacuum can be applied to
outlets 52b and 52°.
In operation, if the signal from the sensor S increases,
the
pilot valve moves rightwardly against spring 78 to
10
close the throttle until the diaphragm vacuum and mam
increase the pressure in chamber 120 (assuming pressure
fold vacuum are restored to their original values. Con
at inlet 46%) and decrease the pressure in chamber 122,
versely, if the throttle suddenly closes slightly for any
so that piston 116 closes throttle 112, and conversely.
reason, with the pilot valve in a ?xed position, the vacuum
Each portion of the pilot valve is subjected to the same
in chamber 50 increases which etfects a corresponding
source pressure (in passage 40*‘), and the ?uid dynamic
but lesser increase in vacuum in chambers 46 and 28,
and static forces in each‘ portion of the pilot valve are
which in turn, opens the throttle until the original mani
equal and substantially constant throughout its travel.
fold vacuum is restored. Thus the device acts as a pres
Hence this double acting pilot valve is inherently bal
sure regulator in which the servomotor maintains the
anced and is substantially independent of source pressure
throttle in a position to maintain substantially constant
variations
without the disc 66 of FIG. 1 or the pressure
values of diaphragm and manifold vacuum for any posi
regulator 1% of FIG. 2; and the novel constant force
tion of the pilot valve; and when the pilot valve assumes
pilot valve con?guration makes this pilot valve inde
another position, the throttle automatically maintains an
pendent
of variations in ?uid dynamic and static forces as
other value of manifold vacuum. This type of reset
reduce correspondingly to permit the diaphragm 24 to
the valve travels.
'
operation is extremely smooth and stable since it rapidly
When the terminology in the claims recite the principles
restores the throttle position, and is made possible by the 25
disclosed herein in terms of engine speed, it should be
balancing and reset action of the disc 66 in the construc
understood that vehicle speed and engine speed are to be
tion shown in FIG. 1.
interpreted vsynonyrnously in construing the invention de
FIG. 2 is a modi?cation of FIG. 1, which shows an
lined by these claims. This is true,‘ particularly for
other means for compensating for variations in the
source pressure in any ?uid servomechanism. In FIG. 30 so-called “automatic throttle” devices for constant road
speed operation as shown in FIG. 1, since at higher
2, the elements common with those in FIG. 1 are so
cruising speeds, the slippage of an automatic transmission
numbered. The only modi?cation is that the disc 66 and
is very slight so that engine speed is very nearly propor
air inlet 76 have been eliminated and replaced by a pres
tional to road speed.
'
sure regulator 100 installed in the main vacuum passage
I wish it understood that my invention is not limited
52 between the pilot valve 32 and intake passage 11. The 35
to any speci?c construction, arrangement or form of the
pressure regulator maintains a substantially constant
parts, and is capable of numerous modi?cations and
vacuum (or pressure) at the exposed area of the pilot
valve irrespective of variations of pressure anywhere in
changes without departing from the spirit and scope of
the claims.
What I claim is:
The pressure regulator illustrated in FIG. 2 40
the air circuit, such as variations at the source (manifold
vacuum).
is of the “series” type and comprises a diaphragm 102
connected to actuate a ball valve 104 and biased by an
1. In a regulating device for controlling the speed of
an internal combustion engine having an intake passage
extension spring 196 for setting the predetermined regu
for the flow of air therethrough, a throttle operatively
diaphragm 102 (and at the pilot valve) tends to reduce,
the regulator valve 194 automatically is opened by the
throttle comprising, a pressure responsive member oper
atively connected to said throttle for actuation thereof,
spring 106 until the vacuum in chamber 59 is restored,
and conversely. Thus the combination of the constant
a vacuum circuit for the flow of air therethrough com
municating with said pressure responsive member on one
mounted in said passage whereby closure of said throttle
lated vacuum such as 5 inches of mercury, for example.
The diaphragm is exposed on one side to the vacuum 45 increases the vacuum in said passage on the downstream
side of the throttle and conversely, the combination of
in chamber 59 and on the other side to the atmosphere.
means to effect speed controlling movements of said
Thus when the vacuum in chamber 50 acting on the
force pilot valve, the pressure regulator, and the elements
to comprise a single-acting servomotor provide particular
utility for any type of ?uid servomechanism using liquid
side thereof and having its outlet communicating with
said intake passage on the downstream side of said
throttle, valve means in said circuit for controlling vacuum
or air under vacuum or pressure, and with any type of 55 therein acting only on said one side of said pressure
signal such as speed, temperature, velocity, etc.
FIG. 3 illustrates the application of the constant force
pilot valve to any kind of double acting servomechanism
110 operated by any kind of signal or sensor S. The
elements in FIG. 3 corresponding to those of FIGS. 1 or
responsive member for effecting movements thereof, bias
ing means acting on said pressure responsive member to
oppose the forces produced by said last named vacuum,
sensing means responsive to changes in the speed of said
engine to produce forces acting on said valve means for
2 are so numbered. In FIG. 3, a throttle or other control
effecting speed regulating movements of said throttle,
member 112 regulates the condition being controlled,
second biasing means acting on said valve means to
such as by controlling the ?ow in a passage 114, which
might be the intake passage of an engine. The throttle
is operated by a double acting servomotor comprising a
piston 116, or its equivalent, movable in a cylinder 118
and dividing the cylinder into two chambers 120 and 122.
The ?uid enters the circuit at 40a'and ?ows through
ori?ces 44 and 48 and out through passage 52b as de
scribed in relation to FIGS. 1 and 2; the con?guration
and construction of the pilot valve body 32, and its seats
are the same as in FIG. 1, which in FIG. 3 controls the
oppose said sensing forces, a vacuum chamber having
an aperture and communicating with vacuum in said air
circuit between said valve means and said intake passage‘,
said valve means including a portion exposed to said air
circuit vacuum and adversely affected by changes in
force produced on said valve portion by variations of
said passage vacuum corresponding to changes of throttle
position, a rigid pressure sensitive member associated
with said valve means and disposed within said aperture
to comprise a movable portion of a Wall or" said chamber,
pressure in chamber 120 through passage 64. However,
said rigid member having an area exposed to said air
in FIG. 3, the pilot valve, which is supported by leaf
circuit vacuum to produce forces tending to compensate
springs 34 and 36, also includes a second valve body 32a 75 for said adverse forces, means to mount said rigid mem
3,068,849
‘7
8
ber to provide a predetermined clearance space between
in the variable condition to produce forces varying'as a
its perimetrical surface and the adjacent surface forming
function thereof and acting on said valve means for effect
ing movements of said movable member, a chamber ex
posed to said varying circuit pressure and having an aper
said aperture, the air which acts on said rigid member
passing through said clearance space under the in?uence
of said passage vacuum, said mounting means including 5 ture therein, a pressure sensitive member producing forces
substantially frictionless swingable means imparting
acting on said valve means to compensate for said adverse
rigidity in all except one direction and acting to support
effects of said ‘forces and disposed within said aperture 7
said rigid member and to maintain said perimetrical clear
to, comprise a movable portion of a wall of said chamber,
ance in all operative positions of said rigid member for
meansto mount said pressure sensitive member and to
substantially frictionless movements in said one direction.
position same to provide a predetermined restrictive clear-l
2. The combination of elements de?ned in claim 1, in '
ance sp'ace'between its perimetrical surface and the adja
which said vacuum acting on said pressure responsive
' cent surface forming said aperture, said ?uid which acts
member tends to open said throttle and said ?rst named
on said pressure sensitive member being induced to'pass
through said clearance space by said source pressure to
biasing means tends to close said throttle, whereby at
?xed positions of said ‘valve means any closure of said
throttle increases said vacuum acting on said pressure
produce said compensating forces, said mounting means
responsive member to move the throttle in an opening
parting rigidity inrall except one direction and acting
including substantially frictionless swingable means im- 7
direction to substantially its original position until the
to support said member and to maintain said’ perimetrical '
vacuum acting on said pressure responsive member is
clearance in all, operative positions of said member for a‘
substantially restored, and conversely. 7
20 substantially frictionless movements in said one direction.
3. In a regulating device for controlling the speed of
5. In a mechanism including a ?uid circuit havinga
an internal combustion engine having an intake passage
source of ?uid pressure to produce a ?ow of ?uid there
for the ?ow of air therethrough, a throttle operatively
mounted in said passageiwhereby closure of said throttle
through, said circuit including inlet and outlet ori?ces in
series therein, valvemeans in said circuit for modulating ‘
' increases thervacuum‘in said passage on the downstream 25 the apertures of said two ori?ces ,oppositely and simul
side of’ the throttle and conversely, the combination of
taneously to control vpressure'irrsa'id circuit between said
means to effect speed controlling movements of said throt-1
two ori?ces, the improvement comprising/a movable
tle comprising, a pressure responsiveimember operatively
valve member included in said valve means, and having
connected to said. throttle for actuation thereof, a vacuum
circuit for the‘ ?ow of
_a;pair’ of spaced valve faces’ cooperating with said inlet
therethrough'communicating 30 and outlet ori?ces, respectively, said inlet ori?ce including
with said pressure responsive member on one side thereof
' and having its outlet communicating with said intake pas
sage on the downstream side of said throttle, valve means
a conically shaped valve seat, the valve face which‘ co, ,
operates with said conical valve seat being cylindrically'i '
in said circuit for controlling pressure therein acting only
tact seating surface; the other of said valve faces being ,
shaped to provide a circular and substantially line con
on said one side of said pressure responsive member for 35 conically shaped, and the outlet ori?ce which vcooperates
effecting movements thereof, biasing means acting on said
pressure responsive member to oppose the forces pro
shaped valve seat to provide a circular and substantially " 7
duced'by said last named pressure, sensing means re
line contact seating surface, for maintaining substantially
with said conical valve face including a cylindrically
sponsive to changes in the speed of said‘ engine to pro
‘constant the-sum of the static and dynamic ?uid forces
duce forces acting on said valve means for effecting 40 produced on said valve means by said source pressure and
speed regulating movements of said throttle, second bias
the resulting ?ow of ?uid therefrom, respectively, through
ing means acting on said valve means to oppose said sens~ ‘
out the entire travel of said valve means;
7 ing forces, a vacuum chamber having an aperture and
* communicating with vacuum in said air circuit between
nected'to said movable member to effect >movementsf thereof, a ?uid circuit having a source of ?uid pressure ‘
vacuum'and adversely affected by changes inlforce pro- ,
,duced-on said 'valve portion by variations of said passage
*vacuum corresponding'to changes of throttle position, a
. pressure‘ sensitive member associated with- said valve
to produce a flow of ?uid therethrough and including
inlet and outlet, ori?ces. therein, saidpressure responsive
member communicating on at least one side thereof with
; means and disposedwithin said aperture to comprise’ a
said circuit at a point between said two ori?ces, valve" '
means in said circuit to control pressure therein acting a’
movable ‘portion of a wall of said chamber, said pressure ,
sensitive member having an area exposedto'said air cir
cuit' vacuum to produce forces tending to compensate
on said pressure, responsive member to e?iectimovements
thereof in response to movements of said valve, means;
sensing means responsive to changes in the variablecon
‘ ~ for, said adverse forces, said area of said pressure sensi
tive member being di?erent from said exposed area of ,
"dition to produce forces varyingias a function thereof and
said valve means, said circuit vacuum acting on said two
a
a
'
,
acting on said valve means foi'leifecting'rnovements of, I
areas to effect a vacuum-produced force differential acting
on said valve means and varying as a function of throttle’
,
‘
tion of a pressure responsive member operatively con
means'iincluding a; portion exposed to 'saidair circuit
,_ing any desired speed-droop.
‘
' response to changes in a variable condition, the combina- '
said valve means and said intake passage, said valve
, position to reset said valve means to positions produc
'
6. In a fluid device to operate a movable member in
,_
said movable member, a movable ,valve memberi-in- a, ' ‘
'rcludediin said valve meansrand having a
60
o,
of’ spaced ‘
valve faces cooperatingiwith said, inlet ‘and outlet ‘ori?ces,
respectively, said inlet‘ori?ceiincludiug a sonically shared 7
, '4.‘ In a '?uid device tooperate a movable member in, t '
V valve'seat, thewalve face which cooperates twith'saidn __
' ' . responsertochanges in a variable condition, the combina- ; V calrvalve seat being cylindrically shapedt'o provide a‘ 1r- '
.tion of aipressure' responsive member 'operatively con
cular and-substantially line contact seating‘ surface; the
nected to said movable member toeifect movements, , 65 other of said valve faces being clinically, shapéd, and t5? F
7 thereof, a?uid' circuit having a source of varying ?uid
pressure to produce a ?ow of ?uid therethrough and
‘communicating with said pressure responsive member,
valve means in said; circuit to control pressures therein
acting on, said pressure responsive member to effect move’.
'ments thereof in response to movements of said valve
,
outlet ori?ce which cooperates with’said conical valve
7 face including a cylindricallyshaped valve seattor provide >7 ' V " 7'
a circular and ‘substantially line contact seating surface,
for-maintaining substantially constant the sum of 'the
staticand dynamic?uid forces ‘produced on said valve '
, gmeans by said source'pressure and the resulting "?ow of
means, said valve meansincluding a portion exposed/to
?uid therefrom, respectively, throughout theentire travel
said, circuit pressure and adversely'a?’ected by changes’
of said valve means. 7
'
a
1 .
'
in force producedion said portionby, said variations, of
7. The combination of means de?ned inclaim ,6,“ and
said circuit pressure, sensing means responsive to changes, 75 said ?uid circuit having a pair of parallel branch circuits;; 1
,7ii '
3,068,849
b
the ?rst of said branch circuits including said ?rst named
inlet and outlet ori?ces, and said second branch circuit
including second inlet and outlet ori?ces having corre
sponding valve seats shaped similarly to those in said
ori?ces in said ?rst branch, and said valve member in
cluding a second pair of spaced valve faces shaped simi
larly to said ?rst named corresponding pair of faces and
correspondingly arranged in relation to their respective
10
pressure, and biasing means acting on said regulator valve
member to oppose the forces of said diaphragm for es
tablishing the values of said regulated pressures in said
circuit.
11. In a control device for regulating the speed of an
internal combustion engine having an intake passage for
the ?ow of air therethrough, a throttle operatively mount
ed in said passage whereby closure of said throttle in
creases the vacuum in said passage on the downstream side
valve seats in said second branch to provide a constant
sum of the static and dynamic ?uid forces on said por 10 of the throttle and conversely, the combination of means
tion of said valve member in said second branch through
out its travel to counterbalance said ?rst named sum of
to effect speed controlling movements of said throttle
comprising, a pressure responsive member operatively
said static and dynamic fluid forces in said ?rst branch,
connected to said throttle for actuation thereof, a vacuum
said pressure responsive member communicating on the
other side thereof, at a point between said two ori?ces in
with said pressure responsive member on one side thereof
said second branch, whereby movement of said valve
means in one direction increases the opening at said inlet
ori?ce of said ?rst branch and at the outlet ori?ce of said
circuit for the ?ow of air therethrough communicating
and having its outlet communicating with said intake pas
sage only on the downstream side of said throttle, valve
means in said circuit for controlling vacuum therein act
ing only on said one side of said pressure responsive mem
second branch while decreasing the opening at said inlet
ori?ce of said second branch and the outlet ori?ce of said 20 ber for effecting movements thereof in a direction to open
said throttle, said valve means including a movable valve
?rst branch, and conversely, to vary the pressures oppo
member and a mating member cooperable therewith,
sitely on reverse sides of said pressure responsive member
spring
biasing means acting on said pressure responsive
for effecting movements thereof.
,
member in a direction tending to close said throttle to
8.,The combination of means de?ned in claim 4, in
which said ?uid circuit includes inlet and outlet ori?ces 25 oppose the forces produced by said last-named vacuum,
the con?guration of said valve member in relation to said
therein, and a movable valve member included in said
mating member adapted to produce modulated pressures
valve means and having a pair of spaced valve faces
acting on said pressure responsive member to e?i'ect move
cooperating with said inlet and outlet ori?ces, respec
tively, said inlet ori?ce including a conically shaped valve
ment thereof as a function of the movement of said valve
member, sensing means responsive to changes in the
30
seat, the valve face which cooperates with said conical
speed of said engine to produce forces acting on said
valve seat being cylindrically shaped to provide a circular
valve means for effecting speed-regulating movements of
and substantially line contact seating surface; the other
said throttle, whereby at ?xed positions of said valve mem
of said valve faces being conically shaped, and the outlet
ber any closure of said throttle increases said vacuum act
ori?ce which cooperates with said conical valve face
ing on said pressure responsive member to move the
including a cylindrically shaped valve seat to provide a 35 throttle in an opening direction until the vacuum acting on
circular and substantially line contact seating surface,
said pressure responsive member is substantially restored,
for maintaining substantially constant the sum of the
and conversely.
static and dynamic ?uid forces produced on said valve
12. In a control device for regulating the speed of an
means by said source pressure and the resulting flow of
internal combustion engine having an intake passage for
40
?uid therefrom, respectively, throughout the entire travel
the ?ow of air therethrough, a throttle operatively mount
of said valve means.
ed in said passage whereby closure of said throttle in
9. The combination of means de?ned in claim 6, and
creases the vacuum in said passage on the downstream side
said source pressure varying in operation to produce ad
of the throttle and conversely, the combination of means
verse force variations acting on said valve means, and
to effect speed controlling movements of said throttle com
pressure regulating means in said ?uid circuit between
prising, a pressure responsive member operatively con
said source and said valve means to maintain a substan
tially constant pressure differential acting thereon.
10. In a self-regulating control mechanism for auto
matically controlling a variable condition, control means
to regulate said controlled condition, the combination of
means for effecting controlled condition-regulating move
ments of said control means comprising, a ?rst pressure
nected to said throttle for actuation thereof, a vacuum cir
cuit for the ?ow of air therethrough and having inlet
and outlet restrictions therein, said circuit communicat
ing with said pressure responsive member on one side
thereof at a point between said two restrictions, and hav
ing its outlet communicating with said intake passage only
on the downstream ‘side of said throttle, valve means in
said circuit for controlling vacuum therein acting only on
means for actuation thereof, a ?uid circuit connected to a
said one side of said pressure responsive member for effect
source of varying ?uid pressure to produce a flow of ?uid 55 ing movements thereof in a direction to open said throttle,
responsive member operatively connected to said control
therethrough and communicating with said ?rst pres
sure responsive member, valve means in said ?uid circuit
for controlling pressure therein acting on said ?rst pres
spring biasing means acting on said pressure responsive
member in a direction tending to close said throttle to op
pose the forces produced by said last-named vacuum, said
sure responsive member for effecting condition regulat
valve means including a movable valve member cooperat
ing movements thereof, sensing means responsive to 60 ing with at least one of said two restrictions to vary the
changes in the controlled condition to produce forces
restrictive effect thereof for modulating said vacuum act
varying as a function thereof and acting on said valve
ing on said pressure responsive member to effect move
means to effect condition regulating movements of said
ment thereof as a function of the movement of. said
valve means and said control means, pressure regulator
valve
member, sensing means responsive to changes in
means controlling pressure in said circuit acting on said 65
the
speed
of said engine to produce forces acting on said
valve means to compensate for the effects thereon of said
valve means for effecting speed-regulating movements of
variations of said pressure in said circuit, said pressure
said throttle, whereby at ?xed positions of said valve
regulator comprising a diaphragm subjected on one side
member
any closure of said throttle increases said vacuum
thereof to the regulated circuit pressure adjacent said valve
means and on the other side thereof to a different pressure, 70 acting on said pressure responsive member to move the
throttle in an opening direction until the vacuum acting on
regulator valve means including a movable regulator valve
member, said diaphragm acting on said regulator valve
said pressure responsive member is substantially restored,
and conversely.
'
member to e?ect movements thereof in a direction to
13. The combination of elements de?ned in claim 3,_in
control the pressure acting on said valve means in any
desired manner irrespective of variations of said source 75 which said vacuum acting on said pressure responsive
3,068,849
11
12
member tends to open said throttle, and said ?rst-named
substantially parallel leaf spring- members, variable-force
biasing means tends to close said throttle.
?rst biasing means acting on said pressure responsive
member to oppose the forces thereon produced by said
internal combustion engine having an intake passage for
pressure in said circuit, the force of said ?rst biasing
the ?ow of air therethrough, a throttle operatively mount 5 means tending to vary as a function of the position of
ed in said! passage whereby closure of said throttle in~
said'pressure responsive member, said valve means con
creases the vacuum in said passage onlthe downstream
trolling pressure on only one side of said pressure re
14. In a control device for regulating the speed of an
side of the throttle and conversely, the combination of
sponsive member, the con?guration of said valve member
~ means to effect speed controlling movements of said throté
in relation to other elements of said valve means adapted
tle comprising, a pressure responsive member operatively
connected to said throttle for actuation thereof, a vacuum
responsive member to eifect movement thereof as a fIlHC-r
circuit for the ?owlof air therethrough communicating
tion of the position of said valve member, second biasing
with said pressure responsive member on one side thereof
means acting on said valve member to oppose the forces
and having its outlet communicating with said intake
passage on the downstream side of ‘said throttle, valve
provided by said sensing means, .the force of said second
to produce modulated pressures acting on said pressure
biasing means tending to vary as a function of the posi- '
means in said circuit for controlling vacuum therein act
tion of said valve member.
_
ing only on said one side of said pressure responsive
18. In a self-regulating control mechanism for auto—
member for effecting movements thereof in a direction to
matically controlling a variable'condition, the combina
open said throttle, said valve means including a mov
' tion of, control means to regulate said controlled con
able valve member and a mating member cooperable 20 dition, a pressure responsive member operatively con
therewith, biasing means acting on said pressure respon
nected to said control means for actuating thereof, a ?uid
sive member in 'a' direction tending to close said throttle
circuit having a ?ow of ?uid therethrough and communi
to oppose the forces produced by said last-named vacuum,
cating with said pressure responsive member, valve means
said valve member including a portion exposed to said
including a movable valve member in said circuit for con
air circuit vacuum and adversely affected by changes in 25 trolling pressure therein acting on said pressure responsive
force produced on said portion by said variations of said
member for effecting movements thereof, sensing means
passage vacuum corresponding to changes of throttle
responsive to changes in said controlled condition and
position,'means associated withsaid'air circuit and sub.
providing forces actingron said valve member to elfect
jected to said circuit-vacuum to compensate for said ad
movements thereof for producing controlled-condition
verse effects of said last-named forces, sensing means re 30 regulating movements of said pressure'responsive meni- '
sponsive to changes in’ the speed of said engine to pro
her and said control means, a ?uid chamber having an
duce forces acting on said valve means for effecting speed
aperture therein, a pressure sensitive member associated’
regulating movements of said throttle.
with said valve member to apply forces acting thereon for
15. The combination of elements de?ned in claim 14,
a?ecting the positioning thereof and disposed within said
in which the con?guration of said, valve member in rela
aperture to comprise a movable portion of a wall of said '
tion to said mating member is adapted to produce modu
chamber, means to mount said pressure sensitive mem- ,
lated pressures acting on said pressure responsive mem
her to position same within said aperture to provide a
ber to effect movement thereof as a function of the move
predetermined clearance space between its perimetrical V ‘
ment'of said valve member.
' 16. In. a self-regulating control, mechanism for auto
40
surface and the adjacent surface forming said aperture,
said mounting means including substantially frictionless
matically controlling a variable condition, the combina
swingable means’ imparting rigidity in all except one direc- ,
tion of, control means to regulate said controlled con
tion and acting to support said pressure sensitive mem
Qditio'n, a pressure responsive member operatively con-y
ber and to-maintain said perimetrical clearance in all
’ operative positions of said member for substantially fric
nected to said control means for actuation thereof, a
?uid circuit having a flow of ?uid therethrough and com
tionless movements in said one direction.
,
municating with said pressure responsive, member, valve
meansrincluding armo'vable valve member in said circuit
wherein said swingable means comprises a pair of spaced
for controlling pressure therein acting on said pressure
substantially parallel leaf spring members. -.
19. The combination of elements de?ned in claim 18,
, responsive member for'e?ecting movements thereof, sens
ing means responsive to'changes in said controlled cone 50
dition and providing forces acting on said valve member
'
20. The combination of means de?ned in claim 4; and
said swingable means’ comprising a pair of spacedisub
stantially parallel leaf spring members and said valve
to effect movements thereof'for producing controlled-V
7 means including a movable valve membensaid pair of i
condition regulating movements of said pressure respon
~sive member and said control means, a fluid chamber
having anaperture therein, a pressure sensitiyemernber
associated with said, valve means for producing reset
I forces acting on said valve member to aifect the regula
leaf spring members also acting to support said valve
55
tion?of said mechanism and disposed within said aperture’
to'comprise a movable, portion of a wall of said chamber,
member for substantially frictionless movements in said
‘one direction by maintaining said valve'rnember sus
pended within the ?uid controlled thereby completely free
of surface contact other than ?uid contact during opera
tional movements thereof
7
.
21. The combination oflmeans de?ned in claim 18,
means ‘to mount said pressure sensitive member to posi 60, and said circuit, communicating with said pressure re
, tion same within said aperture toiprovidc a predetermined V
sponsive member on only one side thereof, said valve’ ,
" clearance spacebetween its perimetrical'surface and the
member. controlling pressure therein acting vonly on said
adjacentsurface‘forming said aperture, said mounting ' one side offsaid pressure responsive member, spring bias? '7 7
means includingrsubstantially‘frictionless swingable means 'mg means acting on said ‘pressure responsive member to'
imparting ,rigidityin all except one direction and acting
65
oppose. the forces produced by, said lasténamed pressure.
~_to?support said‘ pressure sensitive member and To main- ~
> 22. In a self-regulating control mechanism'for’aiuto
' tain
of said
saidperimetrical
member: for substantially
clearance ‘infrictionless
all‘operative
‘movement's
positions ‘ , matically controlling a variable conditionfthe combinaail '7
tion of, control means toldregulate said controlled condi
‘in said one ,directi'o'mand said control means including
tion, a pressure responsive member operatively connected;
' means for'causing a ?uid pressure to vary as a function 7.0 to said control means for actuation thereof, a ?uid circuit
of-‘the position oflsaid control means to act on said pres-7
having a source of varying ‘?uid pressure its produceea 7?’
{sure sensitive member to provide said reset forces acting ' ?ow of ?uid therethrough' and communicating with said:
on said valve means.
. 7
do
a
a
s
pressure responsive member, two, restrictions in series
' 1,7; The combination of‘elements de?ned in claim 16,
said circuit, one of said pair of restrictions" being exposed
‘ iwhereinlsaid sningable means includes a‘pair'of Spaced 75 to said varying sparse Pressure, valve means imaging;
3
"
3,068,849
13
movable valve member in said circuit cooperating with
said last-named restriction for controlling pressure therein
acting on said pressure responsive member for effecting
movements thereof, said valve member having a portion
exposed to said varying pressure and adversely affected
by changes in force produced on said valve portion by
variation in said source pressure, sensing means respon
sive to changes in said controlled condition and providing
forces acting on said valve member to effect movements
thereof for producing controlled-condition regulating
movements of said pressure responsive member and said
control means, a ?uid chamber having an aperture there
in, a pressure sensitive member associated with said valve
member to apply forces acting thereon to compensate for
said adverse forces and disposed within said aperture to
comprise a movable portion of a wall of said chamber,
means to mount said pressure sensitive member to posi
tion same ‘within said aperture to provide a predetermined
clearance space between its perimetrical surface and the
adjacent surface forming said aperture, said mounting
means including substantially frictionless swingable means
imparting rigidity in all except one direction and acting
to support said pressure sensitive member and to main
tain said perimetrical clearance in all operative positions
of said member for substantially frictionless movements
in one direction.
23. The combination of means de?ned in claim 1, and
said swingable means comprising a pair of spaced sub
stantially parallel leaf spring members, and said valve
14
to said throttle for actuation thereof, an air circuit con
nected to the vacuum in said passage on the engine side
of said throttle, valve means in said circuit for control
ling vacuum therein transmitted to said pressure respon
sive member for effecting movements thereof, pressure
regulator means in said circuit between said engine and
said valve means for maintaining a predetermined vac
uum to said valve means irrespective of the vacuum in
said passage and the position of said throttle, and irre
10 spective of the value of the air pressure elsewhere in said
circuit, said pressure regulator means including a mov
able element exposed and responsive to the vacuum being
controlled in said circuit adjacent said valve means, said
vacuum transmitted to said pressure-responsive member
tending to open said throttle when said last named vac
uum increases and conversely, biasing means adapted to
act on said pressure responsive member tending to close
said throttle, means to produce forces varying as a func
tion of the speed of a rotating element in said vehicle and
acting on said valve means to effect movements thereof
for decreasing said vacuum acting on said pressure re
sponsive member as said speed increases, and conversely,
to produce speed-correcting movements of said throttle.
27. In a self regulating control mechanism for auto
matically regulating the speed of an internal combustion
engine included in an automotive vehicle, said engine
having an intake passage for the ?ow of air therethrough
and a throttle in said passage in which closure of said
throttle increases the vacuum in said passage on the en
gine side of the throttle and conversely, the combination
means including a movable valve member, said pair of 30 of, a pressure responsive member operatively connected
leaf spring members also acting to support said valve
member for substantially frictionless movements in said
one direction by maintaining said valve member sus
pended within the ?uid controlled thereby completely
to said throttle for actuation thereof, an air circuit con
nected to the vacuum in said passage on the engine side
of said throttle, at least two restrictions in said circuit,
said pressure-responsive member including means com
free of surface contact other than ?uid contact during 35
operational movements thereof.
24. The combination of means de?ned in claim 1, in
which said ?rst-named biasing means comprises a spring,
and the con?guration of said valve means in relation to
other elements of said valve means adapted to produce
modulated pressures acting on said pressure responsive
member to effect movement thereof as a function of the
municating with said circuit at a point between said two
restrictions, valve means in said circuit to vary the re
strictive effect of at least one of said two restrictions for
modulating the vacuum in said circuit between said re
strictions transmitted to said pressure responsive member
for effecting movements thereof, pressure regulator means
in said circuit between said engine and said valve means
for maintaining a predetermined vacuum to said valve
position of said valve member.
means irrespective of the vacuum in said passage and
25. In a self regulating control mechanism for auto
the position of said throttle and irrespective of the value of
matically regulating the speed of an internal combustion 45 the air pressure elsewhere in said circuit, 'said pressure
engine having an intake passage for the flow of air there
regulator means including a movable element exposed and
through and a throttle in said passage to control said air
responsive to the vacuum being controlled in said circuit
?ow, the combination of, a pressure responsive member
adjacent said valve means, said element including means
adapted to be connected to said throttle for actuation
controlling the entire ?ow of air passing by said valve
thereof, an air circuit connected to said intake passage on 50 means during said pressure-regulating action, said vacuum
the engine side of said throttle, valve means in said cir
transmitted to said pressure-responsive member tending to
cuit for controlling pressure therein transmitted to said
open said throttle when said last-named vacuum increases
pressure responsive member for effecting movements
and conversely, biasing means adapted to act on said
thereof, pressure regulator means in said circuit for main
pressure responsive member tending to close said throttle,
taining a predetermined air pressure at said valve means 55 means to produce forces varying as a function of the
irrespective of the value of the air pressure elsewhere in
speed of a rotating element in said vehicle and acting on
said circuit, said pressure regulator means including a
said valve means to effect movements thereof for decreas
movable element exposed and responsive to the air pres
ing said vacuum acting on said pressure responsive mem
sure being controlled in said circuit adjacent to said valve
means, said element including means controlling the en
tire flow of air passing by said valve means during said
pressure regulating action, and means to produce forces
varying as a function of the speed of said engine and act
ing on said valve means to effect speed-responsive move
ments thereof for producing corresponding movements of
said pressure responsive member with ampli?ed forces for
moving said control means in a speed-correcting direction.
26. In a self regulating control mechanism for auto
ber as said speed increases, and conversely, to produce
speed-correcting movements of said throttle.
'
28. In a self regulating control mechanism for auto
matically regulating the speed of an automotive vehicle
including an internal combustion engine having an intake
passage for the ?ow of air therethrough and a throttle in
said passage to control said air ?ow and producing a vac
uum on the engine-side of the throttle which increases
as the throttle closes, and conversely, said vehicle hav
ing accelerator means including a linkage operatively con
nected to actuate said throttle, spring means acting on
matically regulating the speed of an internal combustion
engine included in an automotive vehicle, said engine 70
said accelerator means tending to move said throttle in a
having an intake passage for the ?ow of air therethrough
closing direction, the combination of, a vacuum-respon
and a throttle in said passage in which closure of said
throttle increases the vacuum in said passage on the en—
sive member adapted to act on said accelerator means to
eifect an increase in the opening of said throttle as the
gine side of the throttle and conversely, the combination
of, a pressure responsive member operatively connected 75 vacuum acting on said member increases, and conversely,
aoeasee
15
15
-
said connection of said throttle and said vacuum respo - '
in all operative positions of- said member for substantially
sive member including a lost motion mechanism compris
frictionless movements insaid ‘one direction. '
ing means connected to said vacuum responsive member
30. The combination of means de?ned in claim 29,
for abutting said accelerator means in a throttle-opening
direction to permit said throttle to be opened unrestrict
and said swingable means comprising a pair of spaced sub
stantially parallel leaf'spring members, said pair of leaf
spring members also acting to support said valve member
edly at anytime by operating said accelerator means ir
respective ofsthe position of said vacuum responsive mem
for substantially frictionless movements in said one direc
ber, an air circuit connected to said intake passage on the
tion by maintaining said valve member suspended Within
engine side of said throttle and'communicating with said
the ?uid controlled thereby completely free'of surface
vacuum responsive’ member, valve means in said circuit '10 contact other than ?uid contact during operational move:
for controlling vaccum therein transmitted to said
ments thereof.
7
vacuum-responsive member for effecting movements
31. In a self-regulating control mechanism for auto
thereof, said valve means being adversely a?iected by the
matically controlling a variable condition, the combina
' variations of said intake-passage vacuum accompanying
tion of, control means to regulate said controlled con
dition, a pressure responsive member operatively con
nected to said control means for actuation thereof, 7a
changes in throttle position, means associated with said
circuit to compensate’ for said adverse effects producible
on said valve means by variation of the vacuum anywhere
in said circuit, and means to produce forces varying as a
function of the speed of a rotating element in said vehicle
?uid circuit having a ?ow of fluid, therethrough and com
municating with said pressure responsive member to’ pro- >
vide ?uid pressure acting thereon always tending to move’
and acting on said valve meansto effect speed-responsive
movements thereof for producing corresponding, move-7
ments of said vacuum responsive member with ampli?ed
' responsive member always tending to decrease the mag- '
forces for moving said control means in a speed-correcting
nitude of the controlled condition, valve means includ
direction.
'
-
said control means to increase the magnitude of the CO‘H-'
trolled condition, biasing ‘means acting on said pressure
ing a movable valve member in said circuit for controlling ,
said ?uid pressure therein acting on said pressure respon- V
'
29. In a self-regulating control mechanism for vauto
matically controlling a variable condition, the combina
sive member for eifecting movement's thereof, sensing
means responsive to changes in said controlled condi
tion of, control means to regulate said controlled condi
tion, a pressure responsive member operatively connected
tionrand‘ providing forces acting on said valve member to said control means for actuation thereof, a ?uid circuit
conditions-regulating
e?fect movementsmovements
thereof forof producing
said pressure
controlled;
‘respona
having a ?ow of ?uid therethrough and communicating so to
'with said pressure responsive member, valve means in
sive member and said control means, means ‘associated 1
cluding a movable valve member in saidv circuit for con
with said control means for causing'?uid pressure in said'
trolling ?uid pressure therein acting on said pressure re
sponsive member for effecting movements thereof, sens
ing means responsive to changes in said controlled condi
trol means, a pressure sensitive member subjected to said '
tion and providing forces acting on said, valve member to
‘varying, ?uid pressure in a direction opposite’ from said N
circuit acting on an area of'said valve member in a ?rst‘
direction to vary as a function of the position of said con-V
effect movements thereof for producing controlled-condi
?rst direction, said pressure sensitive member having a
predetermined area in relation to said valve-member-area
member and said control means, means associated with
and being operatively connected to said valve member‘,
said control means for causing ?uid pressure in said cir 40 to act thereon for providing compensating forces, whereby
cuit acting on an area of said valve member in a ?rst,
at ?xed positions of said valve member, any movement
direction to vary as a function of the position of said con
of said controlvmeaus which tends tolchange the magni4
trol means, a ?uid chamber in said circuit having an aper
tude of the controlled condition causes the pressure act-y
ture therein, a pressure sensitive member subjected to said
ing on said, pressure responsive 'memb‘erto' e?ect move
' varying ?uid pressure in’ a direction opposite from said 45 ment of said control means inv a directiontending to re
tion-regulating movements of said pressure responsive
?rst direction and disposed Within ‘said aperture to com
prise a movable portion of a wall of said chamber, said
pressure sensitive member having a predetermined area 1
in relation to said-valve-member-Varea and ‘being ‘opera~
store said last-named pressure and the magnitude of said"
'
controlled
condition.
'1
t ‘
"
‘
V s ' References €ited in'the file of thispatent ' '
s.
-
s
is i '
tively connected to said valve member to act thereon for
' providing reset forces varying as‘ a function of the posi
' tion ofrsaid control means, means to mount said pressure
sensitive member to position same within said aperture
to provide a predetermined clearance space between its"
perimetr-ical surface and the adjacentsurface formingsaid
' aperture, said mounting means including substantially
frictionless swingable 'means imparting rigidity in all ex
. cept one direction and acting to'support said pressure sen-o
‘sitive member and to maintain said 'perimetrical clearance
, UNITED srAras V PATENTS’ fr
2,431,816
' 2,505,292.
Mallory ____ __'__'____i____ ,DecLZ,
,
Mallory ___’____s__>_e-__ Aprle'2i5, 1950
2,621,482
Meade _'______‘__
__ Decjl6, 1952
2,671,542
Robnett 2.
___.. Mar. 9, 1954
2,708,979
2,835,237
2,912,910
Reynoldson ______ __ __ May ‘24,1955’
Thorner _____________ __ May 20, 1958
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