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Патент USA US3071134

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Jan. 1, 1963
3,071,124
T. F. CRAMER
DIAPHRAGM CONTROLLED AIR FLOW LIMITING
VALVE FOR ENGINE GOVERNING
Filed Oct. 20, 1958
2 Sheetsdheet 1
INVENTOR.
TH OM AS F- CRAMER
BY
A”
/M%CM
ATTOR NEYS
Jan. 1, 1963
3,071,124
T. F. CRAMER
DIAPHRAGM CONTROLLED AIR FLOW LIMITING
VALVE FOR ENGINE GOVERNING
Filed Oct. 20, 1958
2 Sheets-Sheet 2
FIG- 2-
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INVENTOR.
THOMAS F- CRAMER
BY
,
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nitd grates Patent G??ce
1
.‘2
3,673,124
valve means connecting the diaphragms and movable by
the diaphragms to restrict the atmospheric air modi?ca
tion of an engine vacuum for controlling the governing
Thomas F. (Iramer, Warren, Mich, assignor to Hailey
Qarburetor Company, Van Dyire, Mich, a corporation
its lighter spring at a ?rst vacuum pressure to move the
DEAPHRA‘GM CUNTRGLLEYD AIR FLOW LEMITENG
VALVE Fm)‘; ENGENE GOVERNING
of Michigan
‘
Filed Get. 2d, 195%, Ser. No. 768,416
8 Ciaims. (Ql. 123‘-—103)
mechanism; the smaller diaphragm being movable against
valve in one direction with the second larger diaphragm
being responsive to an increased vacuum to move the
‘ valve in an opposite direction.
These and other objects and advantages will become
This invention pertains to a diaphragm controlled air 10 more apparent during the description of this invention
?ow limiting valve for engine governing which is used to
in connection with the drawings, in which:
control available engine vacuum for establishing the ac
FIG. 1 is a side elevational view with portions thereof
tuating force to govern the engine.
in cross section of a four-barrel carburetor provided with
In motor vehicle governing systems, the engine carbu
a governor embodying the invention taken on line 1——1
retor barrel is provided with a venturi for supplying a 15 of FIGURE 3;
speed responsive vacuum to which is metered atmos
FIG. 2 is a side elevational view with the portions
pheric air in an inverse ratio to engine speed so that, as
thereof in cross section taken on the plane of line 2-—2
the speed increases, a greater percentage of the venturi
of FIG. 1;
vacuum is avialable to actuate the engine governing mech
FIG. 3 is a bottom view taken from the direction of
anism. However, with the advent of larger air intakes
arrows 3—-3 of FIG. 1 showing the four barrels of the
in modern engine design, the modi?ed venturi Vacuum
carburetor;
is insu?cient to actuate the governing mechanisms at the
FIG. 4 is an enlarged schematic view of valve mecha
desired time.
nism of this invention which is also shown schematically
This invention overcomes this problem by providing a
in FIG. 1; and
.
valve which, at the speed to be governed, will move from
FIG. 5 is a partial elevational view of the lost motion
an initial position to reduce the metered atmospheric air
connection between the cone valve and diaphragm shown
in FIG. 4.
to the venturi vacuum to a very small value so that sub
stantially all of the venturi vacuum is available for actu
Referring now to FIG. 1, a four-barrel carburetor 10,
ating the governing mechanism for a short period of
of the type referred to above, and having an air intake
time. During this period, the governing function is ini
12, is sectioned to expose one of the primary barrels 14
tiated, and afterwards, when the vacuum condition is at
and one of the secondary barrels 16. The primary barrel
a point where it can control the governing mechanism,
14 is provided with a restriction or venturi throat l8 and
the valve of this invention automatically returns to its
a conventionally operated throttle plate 20 mounted on
initial position.
the shaft 22 which extends through the other primary
The apparatus for accomplishing this includes a pair 03 Or barrel in which is mounted a throttle plate identical to
of opposed spring loaded vacuum operated diaphragms
plate 26. The secondary barrel 16 is also provided with
between which is connected a valve for modifying the
a venturi throat 2.4 and a throttle plate 26 mounted on
atmospheric air to the venturi vacuum. One diaphragm
the shaft 23 which extends through the other secondary
has a smaller area and lighter spring than the other. As
barrel in which is mounted another secondary plate.
the vacuum increases to a predetermined point, the 40
While a particular four-barrel carburetor is shown for
smaller diaphragm will be attracted against its lighter
purposes of illustration, it will be apparent that the inven
spring to move the valve to a closing position and, as
tion is equally applicable to other carburetor construc
the vacuum further increases, the larger diaphragm will
tions.
oppose its heavier spring and the smaller diaphragm to
A vacuum device 3%), commonly referred to as a gover
return the valve to its open position so that the valve is
nor diaphragm assembly, is mounted on the boss 32 ex
closed for a relatively short period of time during which
tending from the carburetor throttle body 34. The assem
the governing function is initiated.
bly 39 includes a ‘body 36 formed to provide recesses 38
it is therefore an object of this invention to provide
and 40. The recess fit? is covered by means of a flexible
an air ?ow valve which is actuable to change the opening
' diaphragm 42 which is secured to the body 36 by means
for air ?ow at a predetermined air pressure and will re
turn the opening to its initial position at a further incre
ment of pressure.
It is an object of this invention to provide an air flow
valve which is ?uid pressure actuable to reduce the open
ing for air ?ow at a predetermined fluid pressure and
will return the opening to its initial position at a further
increment of pressure.
Another object is to provide in an engine governing
system wherein the governing force is derived from an
engine vacuum modi?ed by atmospheric air in inverse
proportions to engine speed, a valve means for reducing
of a cover member 4-4» formed to provide an air-tight
chamber 46 of which the ?exible diaphragm 42 forms a
wall. The cover member may be secured by any suitable
means such as screws 47.
As shown by FIGS. l and 2, the diaphragm 42 has
‘secured to the center thereof in a conventional manner
a rod ‘i8 passing through passage 5% in the body 36 and
having a laterally extending end 52 pivotally secured to
the lever 54 which is rigidly secured to the end 56 of
the primary throttle shaft '22 extending into the chamber
38. The shaft 22 is mounted in an anti-friction bearing
39‘, and a spring 41 is disposed between the bearing 39
and the steel and leather washers 43 and 45 to provide
the atmospheric air, in order to initiate the engine gov
a seal. A tension spring 58 attached between the ad
erning function and then to return the modi?cation of 65 justable pin 60, mounted in one of the holes 62 in the
the vacuum by the atmospheric air at a point where the
‘body 36, and the ?xed pin 64, secured to the lever 54,
modi?ed vacuum is su?icient to operate the governing
tends to hold the primary throttle plate 20 in the open
mechanism.
position. An atmospherically vented cover plate 66 may
A further object is to provide in an engine governing
be secured by screws 63 to housing 36, thereby protect
system a pair of opposed vacuum responsive spring 70 ing the mechanism within chamber 38.
loaded diaphragms, with one diaphragm being smaller
The ori?ce 72 at the primary venturi throat 18 and
than and having a lighter spring than the other, and with
the ori?ce 74- beiow the primary throttle plate 20 are
to a very small value the modi?cation of the vacuum by
8,071,121
41
3
connected by means of the passages 76 and 78 having
?xed restrictions 80 and 82 respectively with the pas
sage 84 in the body member 36 and the passage 86 in
the cover member 44;- which lead to the chamber 46.
A passage 88 connecting with passage 84 terminates in
an opening in the body 36 adapted to receive a threaded
?tting 96’.
A secondary throttle diaphragm assembly 124 is
mounted at the opposite side of the throttle ‘body 34.
163 and has a lost motion connection at the other end
to diaphragm 162. As best seen in FIGS. 4 and 5, the
left end of cone 169 is provided with a slotted member
171 in which pin 172 rides, which pin is ?xed to bifurcated
extension 173 of diaphragm 162. The cone 169 as shown
is in an open position and rightward movement of di
aphragm 163 will move cone 169 and slot 171 right
Wardly over pin 172 without moving diaphragm 162.
As seen, assembly 161 is provided with vacuum cham
This assembly comprises a body 126 having a recess 128v 10 bers 176, 177 which are connected through conduit 131,
vented to the atmosphere through a plate 136 secured by
to Venturi vacuum passage 202 and manifold vacuum
passage 2%. Placed centrally in assembly 161 on either
side of wall 167 are pressure chambers 182, 183 which
136 which is secured to the body 126 by means of a
are connected respectively to threaded ?tting 96 through
cover 138 formed to provide oppositely disposed cham
bers 146 and 1412 between which the ?exible diaphragm 15 conduit 184, and to assembly 92 through conduit 122,
with the two chambers being connected through the a
136 forms a movable wall. The chamber 142 contains
clearance between opening 168 and cone 169.
a compression spring 144 positioned between the cover
The function of valve assembly 161 is to modify the
138 and the rod 146, which is secured to the center of
atmospheric
bleed through conduit 122 to chamber 46
the diaphragm 136, so that the spring 144 urges the rod
of
the
governing
mechanism so that at the initiation of
20
146 upwardly to rotate the lever 14% secured rigidly to
the governing function the bleed is reduced to a very
the secondary throttle shaft 28 counterclockwise, as in
small value so that substantially all of the vacuum force
screws 132 and a recess 134 closed by a flexible diaphragm
FIGURE 3, and close the secondary throttle plates 26.
A conduit 156 extending between the chamber 142 and
the vacuum passages 152 and 154 opening to the primary
and secondary venturi throats 18 and 24 enables primary
and/or secondary venturi vacuum to evacuate the cham
her 142 and displace the diaphragm 136 downwardly,
as in FIG. 1, against the spring 144 to open the secondary
throttle 26. The force of the spring 144 is selected so
that the secondary throttle plate 26 will be open at any
predetermined venturi vacuum.
Located at any desired position on the engine is a
governor valve assembly 92 comprising a stationary hous
ing 94 adapted to be mounted on the engine and contain
ing a shaft 96 driven in any suitable manner in propor
tion to engine or vehicle speed. Mounted for rotation
with the shaft 96 is a laterally extending sleeve 98 having
a spring 100 mounted within the axial passage 102 in the
sleeve by attachment at the end to internally threaded 40
member 164, which is keyed in passage 102. Spring 100
is adjustable axially of sleeve 98 by turning the adjust
is available for actuating diaphragm 42 and, shortly there
after, the bleed from conduit 122 is returned to chamber
4,6 at a point where the vacuum is suf?cient to maintain
the diaphragm 42 in an actuated position.
This is done in the following manner. As governed
speed is approached, the vacuum in conduit 181 increases
and the force created by the differential across diaphragm
163 causes the diaphragm and valve 169 to move to the
right. The force created by the pressure differential
across diaphragm 162 may be greater; however, it is in
effective to move the diaphragm and member 173 to the
left because of lost motion at 171 and the higher spring rate
of spring 164. As cone 169 starts its travel rightwardly,
the clearance between cone 169 and opening 168 is
progressively reduced, decreasing the atmospheric bleed
of chamber 46, thus moving throttle plate 20 towards
closed position and increasing manifold vacuum thereby,
further increasing the pressure differential across dia
phragm 163. When diaphragm 163 has reached its right
wardmost position, the clearance between opening 168
ment screw 106 which is reached by removing the access
screw 198. The other end of the spring 109 is secured
to the governor weight 110 movable axially within the
and cone 169 is at a minimum and substantially all the
vacuum developed in passage 84 is available to actuate
diaphragm 42. As the vacuum in conduit 181 increases,
chamber 112 against the spring 166 and having at the 45 the force created by the pressure dilferential across dia
free end thereof a valve 114 adapted to close the ori?ce
phragm 162 becomes suf?cient to overcome the force of
116 when the weight 116 is forced outwardly due to
spring 164 and the opposing pressure differential across
diaphragm 163 and thereby move the diaphragm to the
the rotation of the shaft ‘96 and the sleeve 98 in accord
ance with engine speed. The engine or vehicle speed at
left causing the conical valve 169 to also move to the
which the ori?ce 116 will be closed is dependent, of course, 50 left by means of member 173 and pin 172. As valve
169 moves to the left to its initial position, the vacuum
upon the adjustment of the spring 100. It is apparent,
system is permitted to function normally.
also, that some other governor valve structure may be
If desired, of course, all or any part of the structure
employed.
A vacuum balancing air bleed is provided through ‘ shown herein may be incorporated into a single, com
assembly 92 to a valve assembly 161 (later described) 55 pact carburetor unit adapted for placement in a vehicle
when ori?ce 116 is uncovered. Conduit 118 between alr
engine compartment.
The drawings and the foregoing speci?cation consti
intake 12 of the carburetor 1t) and the housing 94 and
tute a description of the improved diaphragm controlled
conduit 122 between the housing 94 and the passage 88
air ?ow limiting valve for engine governing in such full,
in the body 36 are provided so that when the engine or
vehicle is operating at a speed insuf?cient to close the 60 clear, concise and exact terms as to enable any person
skilled in the art to practice the invention, the scope of
ori?ce 116, engine vacuum will draw clean air through
which is indicated by the appended claims.
the conduit 118, into the housing 94, through the ori?ce
What I claim as my invention is:
116 and into the chamber 112, through the passage 102
1. An engine governing mechanism comprising a car
and the axial passage 12% in the shaft 96 and thence
through the conduit 122 to the valve assembly 161. When 65 buretor body situated on an engine intake manifold and
having a barrel With a throttle plate pivotable therein,
the engine reaches governed speed, the ori?ce 116 is closed
venturi means being located in said barrel for providing
and the air bleed through conduit 122 is cut off.
a vacuum, means connected to said manifold for supply
As shown in FIGS. 1 and 4, valve assembly 161 has
ing a vacuum, a ?uid motor connected to said throttle
mounted therein opposed diaphragms 162, 163 which are
loaded respectively by adjustable springs 164, 165 with 70 for actuating same, opposed vacuum chambers separated
diaphragm 163 being smaller than diaphragm 162 and
spring 165 being lighter than spring 164. Formed cen
from connected pressure chambers by spring loaded dia
phragms of different areas, with the smaller of said
diaphragms having a lighter spring than the larger of
trally in the assembly 161 is a wall 167 having an open‘
said diaphragms, a diaphragm connected cone being in
ing 168 formed therein through which is inserted a cone
169 which is ?xedly connected at one end to diaphragm 75 serted through the connection between the pressure cham~
5
3,071, 124
bers, said cone decreasing the connection as the smaller
diaphragm is moved against its spring, said venturi and
manifold vacuum means connected to said vacuum
chambers and to the pressure chamber adjacent said
larger diaphragm, means responsive to engine speed for
metering atmospheric air in inverse proportion to engine
speed to the pressure chamber adjacent said smaller dia
phragm, means connecting the aforesaid vacuums and the
metered atmospheric air to said ?uid motor, said cone
6
tion upon the attainment of the predetermined decreased
change in said predetermined value of vacuum.
5. An engine governing system for an internal com
bustion engine comprising a carburetor having a throttle,
a venturi and a manifold, a ?uid motor connected to said
throttle for actuating same, passage means connected to
said venturi to provide a source of variable vacuum,
speed responsive means for providing a metered source
of atmospheric air, and valve means including a variable
being movable by said smaller diaphragm as said venturi 10 ori?ce for connecting the speed responsive metered air
and manifold vacuums reach predetermined values to‘v
decrease the aforesaid connection, due to the greater
pressure drop thereacross as compared to said larger dia~
and the vacuum to form an actuating ?uid pressure for
operating said motor, said valve means being movable
in response to the attainment of a predetermined value of
said vacuum to change the size of said ori?ce between said
phragm, and said cone being movable in a reverse direc
tion as the venturi and manifold vacuums increase and 15 vacuum and said speed responsive metered air, said valve
the pressure drop across said larger diaphragm becomes
means being further movable in response to the attain
greater.
ment of a predetermined decrease change in said predeter
2. An engine governing system for an internal com
mined value of said vacuum to return said ori?ce to its
bustion engine comprising a carburetor having a throttle,
a venturi and a manifold, a ?uid motor connected to said 20
throttle, passage means connecting said venturi and mani
fold to provide a source of speed responsive vacuum,
speed responsive means for providing a metered source of
atmospheric air, and valve means including a variable
original size.
6. An engine governing system for an internal com
bustion engine comprising a carburetor having‘ a throttle,
a venturi and a manifold, a ?uid motor connected to said
throttle for actuating same, passage means connected to
said manifold to provide a source of variable vacuum,
ori?ce for connecting the speed responsive metered air 25 speed responsive means for providing a metered source of
and the vacuum to form an actuating ?uid pressure for
atmospheric air, and valve means including a variable
operating said motor, said valve means being movable in
ori?ce for connecting the speed responsive metered air
response to the attainment of a predetermined value of
and the vacuum to form an actuating ?uid pressure for
said vacuum to change the size of said ori?ce between
operating said motor, said valve means being movable in
said vacuum and said speed responsive metered air, said 30 response to the attainment of a predetermined value of
valve means being further movable in response to the
said vacuum to change the size of said ori?ce between
attainment of a predetermined decrease change in said
said vacuum and said speed responsive metered air, said
predetermined value of said vacuum to return said ori?ce
valve means being further movable in response to the
to its original size.
attainment of a predetermined decrease change in said
3. An engine governing system for an internal com 35 predetermined value of said vacuum to return said ori?ce
bustion engine comprising a carburetor having a throttle,
a venturi and a manifold, a ?uid motor connected to said
throttle to close said throttle, passage means connecting
said venturi and manifold to provide a source of speed
to its original size.
7. A governing system for an engine comprising a speed
control member, a ?uid motor operatively connected to
said member for actuating same, means in said engine
responsive vacuum, speed responsive means for providing 40 for establishing a source of vacuum which is variable in
a metered source of atmospheric air, and valve means
response to the speed of the engine, speed. responsive
including a variable ori?ce for connecting the speed
means for metering atmospheric air, and valve means
responsive metered air and the vacuum to form an actu
providing a variable connection between the speed respon
ating ?uid pressure for operating said motor, said valve
sive vacuum and the speed responsive metered air so as
means being movable in one direction in response to the
to form an actuating pressure for operating said motor,
attainment of a predetermined value of said vacuum to 45 said valve means being movable in one direction in re
decrease the size of said ori?ce between said vacuum and
sponse to the attainment of a predetermined value of the
said speed responsive metered air, said valve means being
aforesaid vacuum to change the aforesaid connection be
further movable in the opposite direction in response to
tween the vacuum and the metered atmospheric air, and
the attainment of a predetermined decrease change in
said valve means being returnable to its original position
said predetermined value of said vacuum to return said 60 in response to the attainment of a predetermined decreased
ori?ce to its original size.
change in said predetermined value of vacuum to return
4. An engine governing system for an internal com
the connection to its original size.
bustion engine comprising a carburetor having a throttle,
8. An engine governing system for an internal com
a venturi and a manifold, a ?uid motor connected to said
bustion engine comprising a carburetor having a throttle,
throttle for actuating same, means connecting said venturi 55 a venturi and a manifold, a ?uid motor connected to said
and said manifold to provide a speed responsive vacuum,
throttle, passage means connecting said venturi and mani
speed responsive means for metering atmospheric air,
fold to provide a speed responsive vacuum source, speed
valve means providing a connection between the speed
responsive means for providing a metered source of at
responsive metered air and the speed responsive vacuum
mospheric air, and valve means including a variable ori?ce
so as to form an actuating pressure for operating said 60 for connecting the speed responsive metered air and the
?uid motor, said valve means being movable in response
vacuum to form an actuating ?uid pressure for operating
to the attainment of a predetermined value of the afore
said motor, said valve means being operable to change the
said vacuum to change the aforesaid connection between
size of said ori?ce upon the attainment of a predetermined
the vacuum and the metered atmospheric air, said valve
value of the vacuum.
means beingretnrnable to its original position in response 65
References Cited in the ?le of this patent
to the attainment of a predetermined decreased change
in said predetermined value of vacuum to return the con
nection to its initial opening, said valve means comprising
a pair of opposed vacuum responsive spring loaded dia
phragms for moving a valve member, one of said dia 70
pbragms having a smaller area and a lighter spring than
the other of said diaphragms for moving the valve mem
ber in one direction upon the attainment of said predeter
mined value of vacuum, and said other diaphragm being
adapted to move said valve member in the opposite direc~ 75
UNITED STATES PATENTS
2,317,271
Higley et a1 __________ _.2 Apr. 30, 1943
2,333,805
Matheson ____________ _.. Nov. 9, 1943
2,359,231
Mallory ____ ___ _______ __ Sept. 26, 1944
2,381,429
2,431,816
2,664,867
Bell _________________ _.. Aug. 7, 1945
Mallory ______________ .._ Dec. 2, 1947
Hartzell ______________ __ Jan. 5, 1954
2,736,305
Kennedy ..__............__.___ Feb. 28, 1956
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