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Патент USA US2408163

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Sept. 24, 1946;; _
_
I ' ~
SPEED
GOVERNOR
'- Filed June 9,
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2,408,161
R. c; DARNELL
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19.44
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2 Sheets-Sheet 1 '
Sept. 24, 1946.
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R. c, DARNELL ‘
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2,403,151
~ SPEED GOVERNOR
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Fiflyed June 9, 1944
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Patented Sept. 24, 1946
2,408,161
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2,408,161
isrnnnv Gov-Emma I
"RtexJCQDarnélhAnn
‘Arbor, Mich, assignor ‘to
I Kmg-‘Seeley Corporation, ~Ann ArybonMichq a
, corporation of Michigan .
, Application-dune 9, 1944*,’Serial No. 589,493
is Claims.‘ (01.137953)
I fllhisjinvention relatesito speed governors vfor
tion‘ I change; but very little with an increase, in
I-spE6d,'and jfor thisreason the-loading :curveror
I internal combustion engines, andimore particu
glarlyjo governors ~ofv the]‘»‘velocity’.’-v or ‘I‘mixture
loading characteristic of such _,gIovernorsIhas,I-i;n ‘
flow” Itype. {Such governors ,eonsist essentially
of I a valve or throttle, plate mounted on
the past, departed considerably ‘from ‘the desired
rotata
straight line- curve under» conditions ofelight ‘load
ble shaft extendingitransverse'ly of the »' intake
or no dead, resulting IinI-a considerableincrease of
I speedunder such-light load or nolloard conditions.
This undesirable increase in'speed whas, hereto
manifoldII-of therengine'torbeigovernedi said shaft
(being @off theicenter linerofvithejmanifold passage,
whereby the forces exerted‘on the throttle plate
fore, been; tolerated as I essential to ,producef-the
Viby-Ithe passage of :fuel-mixturethrough themani- I
IneeessaryIIforce __to close the valve.
1-fold tend-Ito move the-plate 'fromopen' towards
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' I’I‘he'IgeneralIIobject-oi'I Itheq'present ‘invention; is
closed eposition,‘ said gfOI'CES' ‘having varying Ival
Ines as the plate changesrposi-tion. ~A'reac'tance
‘the provision of I an IIimproved :speed governor a‘ of
the velocity or mixture-‘?ow Ity-pe,-lin which the
device in the form ‘of a springorcombinati‘on of
springsconnected to the-throttle :platej spindle I
force Inecessaryior proper-governor valve closure ,
or ‘shaft through .a suitable-linkage, is employed
to ‘produce, a balanced condition :of theplate, in
resorting to engine speedvincrease, whereby-abet
under 'no :load ~Iconditions =is-produced1witho’ut
ter loading I characteristic oriload-speed curvei's
all positions-at governed speedjthepositions' of
obtained.
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- IVA= further Iobjectis the provision or? algovernor I
of the ,Itypedescribed in which, when the gov
the throttle‘ pil‘ateand hence-the amount ‘of fuel
-émixture~passing_ to theengine, II-being dependent
upon the load imposed upon‘ the engine.
tain variation'hetween full load speed'and no load
er-nor {valve mapproacheseclosed i_posi'tion due {to
reductioniri-load, a jforceinaddit'ion'to those nor
mally Iactingupon the governor valve is employed
speed, which variation must be permitted. in,or-'
for urging theJatter towardvclose'd' position. I .I
{In all velocity type governors, :thereis-aper
derito- secure proper functi'o‘ning'of ‘the governor, t r,
_is well understoodin the-art. "This increase
noPl'oad speed as compared with ‘full load speed -
_-;Another object isthe :provision of -a governor
Iof_;t‘he IItypeI described-in which special Lrneans,
lsubjectIto the engine vacuum below‘ the governor
is *preferably less ‘than’ 10% of the governed
'valveI ‘are, gemployed to move ‘the, valve toward
is-p'eed; and‘ is 2known as “the <regulation” of , the
closed-position.-
:governor. Theoretically, the rate of increase "1
@rinygovernedspeed‘betweenfull load and no-load
Iconditionsis-uniform, and-if plotted ‘in terms of
IR.~~ P,;IM». Versus 'brakerhorsepower, would give’a
straight/line‘ “loadingm-urve” ‘or “loadispeed
I-curve.” i-loweveryinypracti'ce, this desirable re
wsultwhas - been; achievedv only in: part.
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~Another objectis the-provision of wanLimproved
~governorj-accordingto ;the last stated “object, in '
whichI/thelspecial-valve closing ineans are ‘actu
atedI onlyIwhen theengine vacuumexceeds apro
,deteIiI-in'inedvalue.
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' _ IA Ifurther objectis the provision of agovernor
of the type described in which the ‘anti-steal
vI-IIn a‘ velocity type governor, ‘the fforces acting
piston usually associated with such governor‘sis
éupon‘the throttle plate;~due~to the passage 'of‘fuel
caused tome-actuated as theagove'fnor valveiap
mixture through the intake conduit have'been
proachesclosed'position, to urge the valvejinf'a
‘considered as 'tWo-fold',-namely, impingement of 9;;
closing
Another-abject
direction@Iis'the provision
7 of a. ‘modi?ed
or
:‘the ffueli mixture upon ‘the di?‘erential exposed
throttle plate. “As {is *rwell known, xthe ‘pressure
:form I; of the? invention
‘which .means ioperable
upomamredetern?ned decrease V in. external at.
inosph'eric I pressure are employed .Tfor' urgingg'the
upstream of “the throttle {plate is substantially
atmospheric when‘t-he carburetor-throttle valve
governor valve‘ltowardolo‘se'd position, "such modi
?cationebeingIespeciallyadapted {for use .at high
"is-in oprenposit-ion,v as is-the‘c'a-se ~when ‘the en
altitudesras- inthe caseof aircraft.
' areas-ofpthe throttleplate, and the differencein
r?uid ,pressure . upstreamvand downstream of the
gine gis-fbein‘g operated under control :of the gov
ernonjj EPh'ei'pressure Ilbeloweor downstream, of
the ‘(governor \valve, ?at ‘governed. speed, changes
with ~theload,varying from a value‘in the neigh-_
' b'orhoorl of’ 2" ofTHg at Tful-lrloadto perhaps --20"
of Hg :atn'ogload. ' Inth'e higher vacuum ranges,
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A further obj eetis --the_ provision ofIaI governor
such-as I~described~in ‘the last Istated Iobject_,y-.in
which the - conventional- anti-steal I pistongis I,actu-_
ated at no "load ~and upon ‘a predetermined de
crease Iin‘atmospheric pressure, to urge the gov
ernor va'lveinaclosinguirectiont,
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say'aboved'if'vof :Hg',"the=forces acting upon the
I ~ "A fdrtherwbject is the: provision, Iimaegovernor
I governor valve vto‘ »~:move it towards F closed ; liOSif
" according-tomeilastrstatedebject;in which means
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are provided for compensating said valve closing
means for changes in temperature.
Other and further objects, features, and ad
vantages will be noted from the description which
follows, taken in connection with the accompany
ing drawings in which
Figure 1 is a sectional viewr of a governor con
structed in accordance with the present inven
tion, on a plane including the axis of the fuel
mixture passage and normal to the throttle valve.
shaft;
4
speed, at engine vacuums representing substan
tial loads on the engine, the forces acting on the
throttle valve increase at a relatively high rate,
thus increasing the forces acting on the governor
valve accordingly and effecting proper governing
action.
On the ‘contrary, as the governor valve
approaches closed position and the engine vac
uum increases further, the curve swings away
from the vertical, indicating that such further
increase in vacuum is achieved only through an‘
undesirable increase in engine speed.
In order to overcome the described de?ciencies
in the velocity type governors heretofore used,
the present invention employs an additive force,
Figure 3 is a curve illustrating the change in 15 derived from the engine vacuum below the gov
ernor valve, which force comes into play as the
engine vacuum (below the governor valve) with
governor valve approaches closed position (i. e. in
wide open carburetor throttle valve; plotted
the higher vacuum range) which force, when
against engine speed;
added to those caused by mixture ?ow past the
Figure 4 is a curve showing engine speed, in
governor valve, serves to move the latter ‘to ‘closed
R. P. M., plotted against load in brake-horse
position, thus eliminating the undesirable speed
power, the substantially vertical portion of the
Figure 2 is a fragmentary sectional view, simi
lar to Figure 1, illustrating a modi?cation ,of the
device of Figure 1;
curve being hereinafter referred to as the loading
curve, and showing speed variation between full
increase above noted.
‘
Referring now to Figure 1, the embodiment
there illustrated comprises ‘a governor body Ill
load and no load conditions;
Figure 5 is a sectional View, similar to Figure 1, 7
illustrating a modi?cation of the present inven
tion especially adapted for high altitude opera- ~
enclosing a fuel mixture conduit II. The gov
ernor body is intended to be inserted in the in
pensating device of Figure 6.
mounted eccentrically with respect to the shaft
I3, whereby the upstream portion of the throttle
take manifold between the carburetor and the
engine, and with the conduit ll aligned with said
tion;
.
manifold passage, the direction of ?ow of fuel
Figure 6 is a fragmentary sectional view show
ing a portion-of'Figure 5 on an enlarged scale; 30 mixture being indicated by the arrows in Figure
1. The governor valve consists of a throttle plate
Figure '7 is a detailed view‘showing the bi
l2 secured upon a shaft l3 extending transversely
metallic temperature compensating device of
through
the fuel conduit. It will be noted that
Figure 6 in end elevation; and
the shaft I3 is mounted eccentrically with respect
Figure 8 is a detail view, in perspective, of one
of the bi-metallic springs of the temperature com 35 to the fuel conduit, and the throttle plate I2 is
In order to facilitate an understanding of the
plate is considerably larger in area than the
invention, reference is made to the embodiments
downstream portion. The shaft I3 is connected
thereof shown in the accompanying drawings,
and detailed descriptive language is employed. It 40 through suitable linkage to a spring balancing
mechanism, which linkage and spring balancing
willnevertheless be understood that no-limita
mechanism are not shown for the reason that
tion of the invention is thereby intended and
they are conventional and well understood in the
that various changes and alterations are contem
art.
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plated such as would ordinarily occur to one
skilled in the art to which the invention relates. 45. The throttle plate l2 is'provided with a project
ing arm M, for cooperation with the end l5 of
Referring now to Figure 4, the straight line
the piston rod l6 of the conventional anti-steal
ACD denotes a theoretically correct loading curve
piston I‘! mounted in the cylinder l8 formed in
in which there is a slight, constant increase of
the governor body. The piston I1 is subjected
speed with reduction in load._ In practice, the
actual loading curve ACB follows the line ACD 50 on its outer face to atmospheric pressure through
the vent l9 and ?lter 2B, and on its inner face
as far as the point C, which corresponds roughly
to the manifold vacuum above the governor valve
to an engine vacuum, below the governor valve,
through the groove 2| formed in the piston rod
of 17” of Hg. From this point onward, as'the
iii. The piston is normally maintained in its out
load is reduced, and due to the previously men
tioned fact that the forces exerted upon the un 55 ward position’ by a light spring22. The groove
2| may be suitably contoured both transversely
balanced governor valve by the mixture ?ow
and longitudinally, to produce a variable con
change‘ but little with increasing speed in the
trolled air bleed depending upon the position of
higher vacuum ranges, the loading curve ACB de
rod l5.
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parts at an increasing rate from the line ACD, the
The conventional functioning of the anti-steal
actual departure at no load varying from 200 60
piston is‘well understood in the art and will not
R. P. M., in the case of well designed governors,
be described, except to point out that, ordinarily,
to very much larger values in less carefully de
the piston rod ‘I6 is in physical engagement with
signed governors. The reason for this departure
the projecting arm M of the throttle plate l2
may bemore readily appreciated by consideration
of Figure 3 which illustrates the values of engine 65 only when the latter is at or near full open posi
tion and the carburetor throttle is partly closed,
vacuum below the governor valve, plotted against
thus introducing the engine vacuum to the space
R. P. M. It will be seen that when the governor
between the two throttle-plates. During the
valve is wide open (i. e., the engine is running at
intermediate portion of the travel of the throttle
below governed speed), the engine vacuum in
plate 12, the piston rod [6 is normally retracted
creases very slowly with increase in engine speed.
as shown in Figure l and, except for the present
As thenengine approaches governed speed and
invention, the same would be true as the throttle
the governor valve begins ‘to close, the increase
in vacuum with increase in R. P. M. occurs at a
plate approached closed position. However, in
accordance with the present invention, the anti
much higher-rate, the curve becoming nearly ver
tical. Thus, for a relatively slight increase in 75 steal piston is made use of during the latter por—
2,408,161
‘5
tion of vthe :throttle .plate travel toward closed
vantage since such :increase in. speed automat
icallyicompensated, ‘toza ‘.degree‘, the-‘loss ‘of engine
powerincidentrtosthe'reduction in. air density and
position, .f0r "exerting ther‘a'dditiye iorceihereto
‘fore mentioned.
.
. To e?ect the above stated purpose, the inner
.Iatm'osph'eric > pressure.
end of the'cylinder I8 is connected with the duel
mixture conduit H. through passages 23 and 24,
the latter opening into the conduit‘ H at :a ‘point
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{Under 'ipres'ent :day conditions, however, in
which‘lzhe-engine'speeds have become'higheriand
.the manifold pressures and resultant'iuel veloci
zties change but‘ slightly with speed, the reduction‘
.in'atmosphericipressure and density with .alti
below the downstream edge of the throttle ‘plate
12 ‘when the latter is "-at or near closed position. 10 .tude-meduces the ‘forces ranting-on the governor
Thus, when the engine is under :load and‘the
‘valve 'to'su'ch an extent :as to materially reduce
below the valve shaft [3 and so disposed as tollie
throttle plate I2 is substantially open, the vac
:the'zelosingeffortenzthervalve,fandthusiincreases
uum below the‘plate is'substantially equalt‘o that
theme load‘ speed‘ftmaharm'ful vextent. For ex‘
‘ample ,ritgis' :kn'own. that'an; engine equipped with a
‘above the plate, andmthe vacuum communicated
to the cylinder 18 through the passages Hand‘
velocity 'type governorrsetioria'no'load speed at
23 is {so :largely reduced. by air entering through a
zse'at'levél of 130G09- RLtPJJM. to 320.0 ‘R. tP. :M."will,
Jatihi'ghaltitudes, reach am vloadispeedas high
.as 4ii0llrtbc45liil
TB. M., aspe'e‘d :in the ‘order-of
the groOVeZl as to be insu?icient to ‘overcome
the .force of spring 22. Accordingly, the ‘governor
operates in a normal manner, without ‘hindrance
from the piston rod 16.
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‘30% iii'gherithanithatjat which ‘the manufac'
20 eturer'interrded" the engine to operate.‘ ‘Bymeans
. ofs-the'zp-resent invention, in the‘ form now to
However, as the load decreases and the throttle
plate I2 aproaches closed ‘position the vacuum
<described;'this "tendency is overcome so that the
no load speed of an engine remaina'substantially
:constant "regardless for the altitude at‘ ‘which it
below the plate increases and, at the same‘tirne,
the passage 24~is, in effect, transferred from the
upstream to the downstream side of the throttle . '
plate and is subjected to the relatively high vac
uum existing below the latter under such condi
tions. The vacuum thus communicated to the
cylinder 18 is only partially reduced by the air
entering through groove 2|, and is su?‘icient to
vantages, iit-isrdesirabie{that the‘ correctionshall
be con?ned to the *no "load eri'd'of the curve.
fR-eferringrnow' to Figure ~15, the “governor "body
30
'-Z6',.';fuel"-conduit v21,ithro'ttle‘plate 28, ‘shaft ‘29,
' andstl-irottl'e plate arm, ~84! correspond :exaotly'to
overcome the force of the spring 22 and to cause
the piston I7 and the piston rod IE to move in
thoseillustrated in Figure :1‘ andrdescribed‘in connection tl'zerewith;v 'Theybo'dy ‘26' is likewise pro
wardly (to the left inF'igure 1), thus causing the
.end l5 of the piston rod to impinge upon the
'vided~with"a cylinder :33 corresponding to ‘cylin
der ' I 8‘ 'of Figure ’1',"»whi'ch cylinder communicates
'at its :outer {end with " the external "atmosphere
1through"vent132 and "?lter 133. A piston T34 is
:slidably ‘mounted Within ‘the cylinder 3i *and :is
arm M of the throttle .plate with a force urging
the latter in the closing direction. In this way,
the forces normally. actingppon the throttle plate
to close it are augmented su?ciently' so that the
"provided iwi'th‘ia‘ipis'ton rod. '35 adapted to make
{contact 11Hdé1“jCBI‘t8.in conditions with the ‘throt
‘undesirable speed increase represented by the
lower po'rtionof the curve ACB of Figure 4 is '
avoided.
is opera’tirig.~~-:At‘the same time-since an increase
in aful‘l 'rlo'ad nspeedxat 'high altitudes has some ad
tleplate‘iarmi?; ‘EI‘he piston 34‘is'normally main
‘
tame-d; in its puterp'osition by va‘spring '36.
,
- :‘I‘he pistonwrod i'35'is 'formed with a groove/31
Figure 2 illustrates a modi?cation in which
.valving means are provided in order that the cyl
inder 18 shall not be subjected to the enginervac
uum until the latter exceeds a predetermined ,
.‘pr‘oviding' communication‘ ‘between the inner" end
of'the ccy'linder 39 and the *fuel conduit upstream
eff-thegovernor-valve. The ‘piston vrod is also
value. ‘In this way, the piston rod fl 6 is prevented
from coming into contact with the throttle plate
:formed ‘1 with . ai'second groove 38, ‘ which, when‘ the
{piston is-in its iinward position, ‘as illustrated in
arm l4 during the intermediate ,portion of the
Figure: :5; ' provides ‘ communication between ‘the
throttle plate travel, i. e., under .normallload con
ditions. In order to effect this purpose, the pets 50 cylinder SI and the‘passage 39 ‘formed'inthe
‘governor'body. ' The passage 39 communicatesv at
sage 24’, which otherwise correspondsto th'e‘pas
its lower end with ‘a passage M opening 'int'o'lthe
sage '24 ,of Figure 1, is‘provided with a spring
fuel conduit '21- at 'a point ‘downstream of the
pressedball check valve 25, which is adapted to‘
valve shaft 29 and so ‘disposed .as to ‘be down
open only when the vacuum‘below the-throttle
plate exceedsa predetermined value, .say‘ '137’_" of 5.5 stream of the lower edge "of-the governor valve
plate 28>when the latter ‘is 'at or'near closed'posi
Hg. The arrangements of both Figure ‘1 and’E'ig
tion.
ure 2 will serve functionally to meetthe require
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The open end of the passage 40 is maintained,
normally closed by vmeans of a 'valveF'M "having
a stem 4i ’, [which valve is ‘normally ‘held in closed
ments as set "forth above. However, it is believed
that the arrangement of Figure 1, under certain
operating conditions, ‘might be more di?icult to 60
position by a resilient device 42, the latter being
calibrate than that of Figure 2, which latter may
‘ housed in a recess 43 formed'inv the governor
therefore possessadvantages' in certain circum
stances.
body. A sealed, gas-?lled, expansible .cartridge
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44 .is likewise housed within the recess :43, .one
end of said cartridge being in engagement with
the outer end of stem 4|'-of the'valve 4|. It'is
‘Referring now to Figures "5 to 8 inclusive, ‘.there
is illustrated a modi?cation of the invention which .
is especially .adaptedffor use with engines'operat—
ing athigh altitudes. ‘It has‘been recognized that
the speed ‘of ‘an engine controlled ‘by a velocity
governor changes as the engine operates indiffer
ent altitudes. Thus, 'bo'th'theIiull load and no
load .speeds of an engine so governed increase
with altitude. In the past,,n0 particular im
portance has been attached to this phenomenon,
it being considered, particularly insofar as ;'full
load speed is’ concerned, actuallytto; be an ad;
intended ‘that the cartridge '54 be ?lled, in un
stressed condition, with a gas such as ‘air; at
normal sea level atmospheric pressure.
The
recess Hi3 is open to the atmosphere by‘means of
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passages
45,15’;
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As- ‘previously explained, the vacuum existing
between the engine ‘and the governor valve is of
a rather high order, extending ‘up- to
high as
18 to.20"v ‘of Hg. at high 'speedszunder noload; 'ilt
isvproposedito'employ this .fOI'Ce'ltO create aniaddi-v
2,408,161
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tive closing effort on the throttle valve under no
load conditions when operating at high altitudes,
which efforts, however, shall be removed at nor
mal levels. Thus, when operating at normal
levels under a no load condition when the engine CR
ure 6) and connected at their outer ends by'a
grooved washer 41 which also serves to connect
them to the valve stem 45, the washer 41 being
retained on the valve stem 4|’ by means of a
clip 48. The springs 42 are so constructed that
they tend to expand upon an increase in tem
vacuum will be of the order of 20" of Hg, the
tendency of the valve 4| to open in response to
such engine vacuum will be resisted by the spring '
perature, and are so calibrated as to exactly off
junction with the high vacuum on the head of
tion engines, a governor body enclosing a fuel
sets the tendency of the cartridge 44 to expand
upon a like increase in temperature.
42, and the engine vacuum is thus prevented from
Having thus described the invention, what is
being communicated to the cylinder 3 l. However, 10
claimed as new and desired to be secured by
at relatively high altitudes, the entrapped air
in the cartridge 44, being at a pressure higher
Letters Patent is:
1. In a speed governor for internal combus
than that existing in recess 43, will tend in con
valve 4| to expand the cartridge 44, overcoming 15 mixture conduit, an unbalanced throttle plate
pivoted in said conduit and having the larger
the force of the spring 42 and opening the valve
4|. The engine vacuum is thus communicated
of its unbalanced areas disposed upstream of its
to the passage 39, groove 33, and cylinder 3|.
pivot axis, means including a pressure responsive
The force thus exerted upon the piston 34 is com
element for urging said throttle plate toward
municated through the piston rod 35 to the throt
closed position, and means for subjecting ‘said
tle plate 3|] and becomes the above mentioned ad
element to the engine vacuum when said throttle
ditive force for urging the throttle plate’28 to
plate is near its closed position.
closed position.
If, however, while operating under the above
described conditions, an additional load is
2. In a speed governor for internal combustion
engines, a governor body enclosing a fuel mix
ture conduit, an unbalanced throttle plate piv
thrown on the engine, the engine speed, will de
oted in said conduit and having the larger of its
crease somewhat, reducing the forces normally
unbalanced areas disposed upstream of its pivot
acting on the throttle valve, and the spring re
axis, means including a pressure responsive ele
actance will partially open the latter, forcing the
ment for urging said throttle plate toward closed
piston rod 35 outwardly and interrupting com 30 position, and means for subjecting said element
munication between the groove 38 and passage
to the engine vacuum when said throttle plate
39. The cylinder 3| is thus cut off from the en
is near its closed position, said last means com
gine vacuum below the governor valve, and the
prising a passage extending from said element
additive closing force thus removed from the
to a point in said fuel mixture conduit down
- latter, thus permitting the engine to run in a 35 stream from said throttle plate.
normal manner, even though the lower edge of
3. In a speed governor for internal combustion
the throttle plate is still above the valve 4|. As
engines, a governor body enclosing a fuel mix
greater load is imposed on the engine, and the
ture conduit, an unbalanced throttle plate piv
governor valve opens wider, the lower edge of the
oted in said conduit and having the larger of its
throttle plate 28 gradually passes below the valve 40 unbalanced areas disposed upstream of its pivot
4|, transferring the latter to the upstream side
axis, means including a pressure responsive ele
of the throttle valve and enabling the spring 42
ment for urging said throttle plate toward closed
to retract the valve 4| on to its seat. The com
position, and means for subjecting said element
bination of the interruption of communication
to the engine vacuum when said throttle plate
between groove 38 and passage 39, and the trans
is near its closed position, said last means com
fer of the valve 4| from the downstream to the 4:5 prising a passage extending from said element to
upstream side of the throttle plate, enables the
a point in said fuel mixture conduit, said last
governor to operate at high altitudes, in the
point being located below the downstream edge
heavier load positions of the throttle plate in the
of said throttle plate when the latter is near its
same manner as at low altitudes.
It will, of course, be appreciated that in order 50 closed position.
4. In a speed governor for internal combustion
to obtain a gradual transfer of forces it may be
engines, a governor body enclosing a fuel mix
necessary to provide progressive areas of regis
ture conduit, an unbalanced throttle plate piv
tration between the groove 38 and the passage
oted in said conduit and having the larger of its
39 and also progressive areas of communication
unbalanced areas disposed upstream of its pivot
between the fuel conduit 21 and the groove 31
axis, means including a pressure responsive ele
so as to eliminate sudden changes of force and
ment for urging said throttle plate toward closed
produce, instead, a gradual transfer at such a
position, and means for subjecting said element
rate as will bring about a proper functioning of
to the engine vacuum When said throttle plate
the device as a Whole. This may be accomplished
by suitably contouring the grooves 3‘! and 38 60 is near its closed position, said last means com
prising a passage extending from said element
to a point in said fuel mixture conduit down
stream from said throttle plate, and valve means
in said passage adapted to open when the engine
vacuum exceeds a predetermined value.
that if the cartridge is sealed at a normal out
5. In a speed governor for internal combustion
door temperature of say 70° F., as its temperature
engines, a governor body enclosing a fuel mix
rises due to engine heat, the enclosed entrapped
ture conduit, an unbalanced throttle plate piv
air will rise in pressure and the force acting to
oted in said conduit and having the larger of its
open the valve 4| will be thus increased. In order 70 unbalanced areas disposed upstream of its pivot
axis, means including a pressure responsive ele
to offset this factor, the springs 42 are formed of
ment for urging said throttle plate toward closed
bi-metallic strips of serpentine configuration, al
position, and means for subjecting said element
though otherbimetal arrangements would be fa
to the engine vacuum when said throttle plate
miliar to those schooled in the art, secured in
the governor body at their inner ends (46,, Fig 75 is near its closedposition, said last means com
‘by empirical methods.
The foregoing description has not taken into
account the effect of the variation in temperature
upon the cartridge 44. It will be appreciated 65
2,408,161
10
prising a passage extending from said element
to a point in said fuel mixture conduit down
stream from said throttle plate, valve means in
said passage, and spring means for maintaining
said valve in closed position during normal oper
ation under load.
6. In a speed governor for internal combustion
engines, a governor body enclosing a fuel mix
C1.
projecting into said conduit and adapted to en
gage said throttle plate arm.
11. The combination de?ned in claim 10, said
piston rod being formed to provide a communi
cating passage between said cylinder and said
conduit.
12. The combination de?ned in claim 10, said
piston rod being formed to provide a communi
cating passage between said cylinder and said
ture conduit, an unbalanced throttle plate piv
oted in said conduit and having the larger of its 10 conduit, the cross-sectional area of said passage
varying along its length, whereby the area of
unbalanced areas disposed upstream of its pivot
the opening between said rod and said body var~
axis, means including a pressure responsive ele
ies with movements of said piston.
ment for urging said throttle plate toward closed
13. In a speed governor for internal combus
position, and means for subjecting said element
to the engine vacuum when said throttle plate 15 tion engines, a governor body enclosing a fuel
mixture conduit, an unbalanced throttle plate
is near its closed position, said last means com
pivoted in said conduit and having the larger
prising a passage extending from said element
of its unbalanced areas disposed upstream of
to a point in said fuel mixture conduit down
its pivot axis, said throttle plate having a pro
stream from said throttle plate, valve means in
said passage, spring means for maintaining said 20 jecting arm, a cylinder associated with said gov
ernor body, a piston in said cylinder subjected
valve in closed position during normal operation
to atmospheric pressure on its outer end, said
under load, and meansfor opening said valve
against the pressure of said spring when the
piston having an extension projecting into said
conduit and adapted to engage said throttle plate barometric pressure of the surrounding atmos
phere becomes substantially less than normal 25 arm, said extension being formed to provide a
communicating passage between said cylinder
sea-level barometric pressure.
and said conduit and a second passage extend
7. The combination de?ned in claim 6, said
ing from said cylinder into said governor body,
valve opening means comprising a sealed, gas
spring means for urging said piston toward its
?lled expansible cartridge, one wall of said car
tridge operatively engaging said valve.
30 outward position, a passage opening into said
conduit at a point downstream from said throttle
8. The combination de?ned in claim 6, said
plate and extending in said valve body to a point
valve opening means comprising a sealed, gas
adjacent said piston extension, whereby said last
?lled expansible cartridge, one wall of said car
tridge operatively engaging said valve, and said
passage and said second passage intercommuni
spring being of temperature-compensating con 35 cate when said piston is in an inward position,
a valve in said last mentioned passage, spring
struction to counterbalance the effect of atem
perature increase on said cartridge.
means for maintaining said valve normally closed,
and means for opening said valve against the
9. The combination de?ned in claim 6, said
pressure of said spring when the barometric
valve opening means comprising a sealed, gas
pressure of the surrounding atmosphere becomes
?lled expansible cartridge, one wall of said car
substantially less than normal sea-level baromet
tridge operatively engaging said valve, and said
ric pressure.
spring being of serpentine, bimetallic construc
14. The combination de?ned in claim 13, said
tion to counterbalance the effect of a temperature
increase on said cartridge.
valve opening means comprising a sealed, gas
10. In a speed governor for internal combus-'
tion engines, a governor body enclosing a fuel
mixture conduit, an unbalanced throttle plate
pivoted in said conduit and having the larger,
of its unbalanced areas disposed upstream of
its pivot axis, means including a pressure re
sponsive element for urging said throttle plate
?lled expansible cartridge, one wall of said car
tridge operatively engaging said valve.
15. The combination de?ned in claim 13, said
valve opening means comprising a sealed, gas
?lled expansible cartridge, one wall of said car
tridge operatively engaging said valve, and said
spring being of temperature-compensating con-
toward closed position, and means for subjecting
' struction to counterbalance the effect of a tem
perature increase on said cartridge.
said element to‘the engine vacuum when said
throttle plate is near its closed position, said
16. The combination de?ned in claim 13, said
throttle plate having a projecting arm, and said 55 valve opening means comprising a sealed, gas
pressure responsive element comprising a cylin
?lled expansible cartridge, one wall of said car
tridge operatively engaging said valve, and said
der associated with said governor body, a piston
in said cylinder and subjected to atmospheric
spring being of serpentine, bimetallic construc
tion to counterbalance the effect of a temperatuie
pressure on its outer end, and spring means for
urging said piston toward its outward position, 60 increase on said cartridge.
said piston having a rod extending through and
closely ?tting a bore in said governor body and
REX C. DARNELL.
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