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Патент USA US3062156

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Nov. 6, 1962
s. a. KEEVIL, ‘JR
3,062,150
FUEL PUMP
Filed Feb. 23, 1960
JNVENTOR.
SIDNEY G. KEEVIL. JR
wwm
ATTORNEY
Free,
United States atet
3,062,150
Patented Nov. 6, 1962
1
2
3,062,150
which extends through coaxial bearings 7———7 in the side
?anges 8—8 of the rocker arm, the ends of the pin being
securely mounted on the side walls of the housing 2.
The outer end 9 of the rocker arm 4 is adapted to slidably.
FUEL PUMP
Sidney G. Keevil, .Ir., Arnold, Mo., assignor to ACF In
dustries, Incorporated, New York, N.Y., a corporation
'of New Jersey
Filed Feb. 23, 1960, Ser. No. 10,504
6 Claims. (Cl. 103—-38)
This invention relates to fuel pumps and, more par
engage a cam 11 provided on a camshaft 12 driven by the
engine.
The inner end 13 of the rocker arm 4 is bifurcated to
receive one end of a pull rod 14 having a head 16 and
washers 17 thereon for engagement by the rocker arm.
ticularly, to engine driven diaphragm pumps adapted to 10 The pull rod 14 extends into a spring housing 18 which
is preferably formed integral with the rocker arm housing
continuously supply fuel from a fuel tank to a car
2 and provided with an annular shoulder 19 to engage
buretor in sufficient quatities to satisfy engine require
the
marginal portion of a ?exible oil sealing member 21
ments.
having a central aperture to snugly receive the pull rod.
Engine driven diaphragm fuel pumps have hereto
fore been provided with a rocker arm pivotally mounted 15 A spring seat member 22 is secured to the end of the pull
intermediate its ends, one end of the arm being disposed
to engage a pull rod secured to the diaphragm, and the
other end of the arm being biased against a cam on an
engine driven camshaft by means of a compression spring
rod 14 for engagement by a helical rocker arm biasing
spring 23 seated on a spring retainer 24 which, in turn,
is seated against the marginal portion of the sealing mem
ber 21, said spring being normally under compression to
interposed between said other end of the arm and a rocker
arm housing. During operation of the pump, the cam
acts through the rocker arm and pull rod to move the
diaphragm in one direction to draw fuel from the tank
past an inlet valve into a pump chamber, the diaphragm
maintain the outer end of the rocker arm in engagement
arm against an engine driven cam.
46, respectively. A cover 47 is bolted to the valve cas
with the cam 11.
The spring seat member 22 is formed with diametrically
opposed slots 26-26 to receive arms 27—-2'7 formed on
a connecting link 28, each arm being formed at its end
being moved in the opposite direction by a compression 25 with laterally extending ears 29—29 for abutting engage~
ment against the spring seat member to limit movement
spring to discharge fuel from the pump chamber past an
of the link 28 in one direction relative to the pull rod.
outlet valve to the carburetor at a substantially constant
The link 28 is secured to the central portion of a ?exible
pressure.
pump diaphragm 30 by means of a rivet 31 which also
An object of the present invention resides in the
serves to secure backing plates 32 and 33 against oppo~
provision of an engine driven diaphragm fuel pump
site sides of the diaphragm. The spring seat member 22
wherein the rocker arm biasing spring is mounted within
and connecting link 28 thus provide a lost motion con
the ‘spring housing and acts through the pull rod to bias
nection between the pull rod 14 and the pump diaphragm
the rocker arm against the engine driven cam.
30.
Another object of the invention resides in the provision
The marginal portion of the pump diaphragm 30 is
of a fuel pump wherein the biasing spring acts to bias 35
clamped between annular ?anges 36 and 37 on the spring
the rocker arm transversely of the pivot pin to thereby
housing and a valve casing 38, respectively, by means of
reduce noise due to wear of the pivot pin and the pin re
cap screws 39. The diaphragm 30 and valve casing 38
ceiving hearings on the rocker arm.
de?ne a pump chamber 41. The valve casing 38 is pro
A further object of the invention resides in the pro
vided with inlet ports 42 and outlet ports 43 which are
vision of a fuel pump wherein the biasing spring is dis
normally closed by spring biased check valves 44 and
posed to exert its maximum force in biasing the rocker
ing 38 with a resilient gasket 48 therebetween to de?ne
Another object of the invention resides in the provision
of a fuel pump wherein the usual spring retaining tang 45 a fuel inlet chamber 49 and a pulsation chamber 51.
The cover 47 is provided with a fuel inlet 52 connected
‘is omitted from the rocker arm.
to a fuel tank T by means of a conduit 53, and the valve
Another object of the invention resides in the provision
casing 38 is provided with a fuel outlet 54 connected to
of a diaphragm fuel pump having a lost motion connec
a conventional carburetor C by means of a conduit 56.
tion between the diaphragm and the pull rod.
The invention embodies other novel features, details 50 A diaphragm biasing compression spring 57 is seated on
the spring retainer 24 to engage and bias the diaphragm
of construction and arrangement of parts which are here
upwardly toward the pump chamber 41 to discharge fuel
inafter set forth in the speci?cation and claims and illus
therefrom on the discharge stroke of the pump.
During operation of the fuel pump to supply fuel from
wherein:
FIG. 1 is a vertical section illustrating a fuel pump 55 the tank T to the carburetor C, the rocker arm 4 is ?rst
pivoted in a clockwise direction on the intake stroke, as
embodying features of the invention, the pump being
viewed in FIG. 1, to pull the pull rod 14 and diaphragm
shown as applied to an internal combustion engine to
30 downwardly to draw fuel from the tank T past the
supply fuel from a tank to a carburetor.
intake valve 44 into the pump chamber 41.
FIG. 2 is an enlarged fragmentary section, partly in
On the discharge stroke of the pump,'the rocker arm
elevation, illustrating the lost motion connection between
trated in the accompanying drawing, forming part thereof,
the diaphragm and the pull rod.
FIG. 3 is a detail section taken along the line 3—3
of FIG. 2.
FIG. 4 is a fragmentary section, corresponding to FIG.
‘2, illustrating a modi?ed form of lost motion connection 65
between the diaphragm and the pull rod.
Referring now to the drawing for a better understand
ing of the invention, the fuel pump is shown as compris
ing a rocker arm housing 2 adapted to be detachably se
biasing spring 23 acts through the spring seat member
22 and pull rod 14 to pivot the rocker arm 4 in a counter
‘clockwise direction, as viewed in FIG. 1, to maintain the
outer end 9 of the rocker arm in abutting engagement
against the cam 11. The diaphragm biasing spring 57
then acts to urge the diaphragm 30 upwardly to force
fuel from the pump chamber 41 past the outlet check
valve 46 into the pulsation chamber 51 and thence through
the outlet 54 and conduit 56 to the carburetor.
Throughout the operating cycle of the fuel pump, it
cured to an internal combustion engine 3 by means of 70
will be noted that the rocker arm biasing spring 23 acts
screws. A rocker arm 4 of generally channel section is
to exert an upward force on the rocker arm 4, as viewed
pivotally mounted intermediate its ends on a pivot pin 6
3,062,150
3
4
in FIG. 1, to maintain the bearings 7—7 in contact at all
times against the underside A of the pivot pin 6 to thereby
reciprocable pumping element mounted in said housing
eliminate the slapping or clicking noise usually associated
with conventional diaphragm fuel pumps when the pivot
pin and rocker arm bearings become worn, as pointed
out in US. Patent 2,919,654 issued January 5, 1960‘ to
Alfred C. Korte.
to move ?uid through said pumping chamber, a pull rod
in said housing, a lost motion connection between said
pull rod and pumping element, a rocker arm pivotally
mounted intermediate its ends in said housing, one end
of said arm adapted to engage said cam and the other
end engaging said pull rod, whereby said pumping ele
FIG. 4 illustrates a modi?ed form of the invention
ment may be pulled in one direction to draw fuel into
wherein the pull rod 55 is provided with a spring seat
said pumping chamber responsive to rotation of said cam,
portion 58 for engagement by the rocker arm biasing 10 a ?rst helical compression spring engaged between said
spring 23, the rod having an axial bore 59 to receive the
housing and said pull rod to bias said one end of the
lower end of a connecting link 61 formed with a slot 62
to receive a pin ‘63 mounted at its ends in the spring seat
rocker arm against said cam, a second he‘lical compres
portion 58. In this form of the invention, the upper end
ing element to urge said element in a direction to dis
of the link 61 may be peened over at 64 to secure the link,
charge fuel from said pumping chamber responsive to
rotation of said cam, said pumping element comprising
a ?exible diaphragm forming one wall of said pumping
chamber, said lost motion connection comprising a head
on said pull rod engaged by said ?rst spring, and a link
secured to said diaphragm for engagement with said head.
4. A fuel pump for an internal combustion engine hav~
backing ptlates 32-33, and diaphragm 30‘ in assembled
relationship. This embodiment of the invention is other—
wise similar in construction and operation to the form
illustrated in FIGS. 1 and 2.
Certain structures have been shown and described here
in which will ful?ll all the objects of the present inven
tion, but it is contemplated that other modi?cations will
be obvious to those skilled in the art which come within
sion spring engaged between said housing and said pump
ing a rotatable pump actuating cam, said fuel pump com
prising a housing having a pumping chamber therein, a
reciprocable pumping element mounted in said housing
the scope of the invention as de?ned by the appended
claims.
I claim:
1. A fuel pump for an internal combustion engine hav
ing a rotatable pump actuating cam, said fuel pump com
prising a housing having a pumping chamber therein, a
to move ?uid through said pumping chamber, a pull rod
in said housing, a lost motion connection between said
pull rod and pumping element, a rocker arm pivotally
mounted intermediate the ends thereof in said housing,
one of said ends of said rocker arm adapted to engage
reciprocable pumping element mounted in said housing
30 said cam and the other of said rocker arm ends engaging
to move ?uid through said pumping chamber, a pull rod
in said housing, a lost motion connection between said
pull rod and pumping element, a rocker arm pivotally
mounted intermediate its ends in said housing, one end
said pull rod, whereby said pumping element is pulled
of said arm adapted to engage said cam and the other
rod to bias said one end of the rocker arm against said
end engaging said pull rod, whereby said pumping ele
cam, a second helical compression spring engaged be
tween said housing and said pumping element to urge
ment may be pulled in one direction to draw fuel into
said pumping chamber responsive to rotation of said cam,
in one direction to draw fuel into said pumping chamber
responsive to rotation of said cam, a ?rst helical com
pression spring engaged between said housing and said pull
said element in a direction to discharge fuel from said
a ?rst helical compression spring engaged between said
pumping chamber responsive to rotation of said cam, said
pumping element comprising a ?exible diaphragm form
ing one wall of said pumping chamber, said lost motion
sion spring engaged between said housing and said pump
connection comprising a spring seat member on said pull
ing element to urge said element in a direction to dis
rod engaged by said ?rst spring, a link secured to said
charge fuel from said pumping chamber responsive to
diaphragm for engagement with said seat member, said
rotation of said cam, said ?rst and second springs being 45 link having spaced arms straddling said seat member,
coaxial with said pull rod, and a spring retainer member
and ears on the ends of said arms for ‘abutting engage
mounted on said housing for engagement by said ?rst
ment with said seat member.
and second springs.
5. A fuel pump for an internal combustion engine hav
housing and said pull rod to bias said one end of the
rocker arm against said cam, a second helical compres
2. In a fuel pump for an internal combustion engine
ing a rotatable pump actuating cam, said fuel pump com
having a rotatable pump actuating cam, a housing hav 50 prising a housing having a pumping chamber therein, a
ing a pumping chamber therein, a reciprocable pumping
reciprocable pumping element mounted in said housing
element mounted in said housing to move ?uid through
to move ?uid through said pumping chamber, a pull rod
said pumping chamber, a pull rod in said housing, a
in said housing, a lost motion connection between one
lost motion connection between said pull rod and pump
end of said pull rod and said pumping element, a rocker
ing element, a rocker arm pivota'lly mounted intermedi 55 arm pivotally mounted intermediate its ends in said hous
ate its ends in said housing, one end of said arm engag
ing, one end of said rocker arm adapted to engage said
ing said cam and the other end engaging said pull rod,
cam and the other end of said rocker arm engaging the
whereby said pumping element is pulled in one direction
other end of said pull rod, whereby said pumping element
to draw fuel into said pumping chamber responsive to
is pulled in one direction to draw fuel into said pump
rotation of said cam, a ?rst helical compression spring 60 ing chamber responsive to rotation of said cam, a ?rst
engaged between said housing and said pull rod to bias
helical compression spring engaged between said housing
said end of the rocker arm against said cam, a second
and said pull rod to bias said one end of the rocker arm
helical compression spring engaged between said housing
against said cam, a second helical compression spring
and said pumping element to urge said element in a di
engaged between said housing and said pumping element
rection to discharge fuel from said pumping chamber 65 urging said element in a direction to discharge fuel from
responsive to rotation of said cam, said ?rst and second
said pumping chamber responsive to rotation of said cam,
springs being coaxial with said pull rod, a spring re
said pumping element comprising a ?exible diaphragm
tainer member mounted on said housing for engagement
forming one wall of said pumping chamber, said lost
byv said ?rst and second springs, and a ?exible gasket en
motion connection comprising a head on said one, pull
gaged between said spring retainer member and housing 70 rod end engaged by said ?rst spring, said one pull rod
and provided with a central aperture to receive said pull
end formed with a bore coaxial therewith, a link secured
rod.
to said diaphragm and having one end thereof positioned
3. A fuel pump for an internal combustion engine hav
within said bore for telescopic engagement with said
ing a rotatable pump actuating cam, said fuel pump com
head, said link having a slot therein, and a pin mounted
prising a housing having a pumping chamber therein, a 75 on said head and extending through said slot.
3,062,150
5
arm adapted to engage said cam and the other end there
responsive to rotation of said cam, said pumping element
comprising a ?exible diaphragm forming one wall of said
pumping chamber, said lost motion connection compris
ing a link ‘secured to said diaphragm and having a slot
therein, a pin mounted on said one pull rod end and ex
tending through said slot, and backing plates on oppo
site sides of said diaphragm, said link including means
clamping said backing plates against said diaphragm.
10
of engaging the other end of said pull rod whereby said
pumping element is pulled in one direction to draw fuel
into said pumping chamber responsive to rotation of
said cam, a ?rst helical compression spring engaged be
tween said housing and said pull rod to bias said one 15
end of the rocker arm against said cam, a second helical
compression spring engaged between said housing and
said pumping element urging said pumping element in
6
a direction to discharge fuel from said pumping chamber
6. A fuel pump for an internal combustion engine
having a rotatable pump actuating cam, said fuel pump
comprising a housing having a pumping chamber there
in, a reciprocable pumping element mounted in said
housing to move ?uid through said pumping chamber,
a pull rod in said housing, means forming a lost motion
connection between one end of said pull rod and said
pumping element, a rocker arm pivotally mounted inter
mediate its ends in said housing, one end of said rocker
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,749,367
1,919,040
1,919,496
1,981,667
Zubaty ______________ __
Rockwell ____________ _._
Babitch _____________ __
Rockwell ____________ __
Mar. 4,
July 18,
July 25,
Nov. 20,
1930
1933
1933
1934
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