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Патент USA US3093133

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June 11, 1963
G. R. NORTH
3,693,125
FUEL INJECTION PUMPS
Filed 001. 20. 1960
2 Sheets-Sheét 1
INVENTO/L
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4rramE/I
June 11, 1963
G. R. NORTH
3,093,125
FUEL INJECTION PUMPS
Filed 001:. 20. 1960
2 Sheets-Sheet 2
a
WWI/M
United States Patent 0 rice
3,993,125
Patented June 11, 1963
1
2
3,093,125
One end of the control rod .11 is connected by means
of a coupling piece 12 to a pneumatic governor 13 which
is a modi?ed form of the type known commercially as
“Simms” type GP. The coupling piece 12 is secured
FUEL INIECTION PUMPS
Geoffrey Robson North, London, England, assignor to
Simms Motor Units Limited, London, England, a
Eritish company
Filed Oct. 20, 1960, Ser. No. 63,359
5 Claims. (Cl. 123—140)
' to the control rod ‘11 by means of a grub screw 44 and
has a channel portion 45 ‘which cooperates with a guide
rod 46.
The pneumatic governor 13 comprises a chamber 14
which is closed at one end by a ?exible diaphragm >15
The invention relates to fuel injection pumps for sup
plying fuel to the combustion chambers of internal com 10 and has an air inlet 16 and an outlet 17 which are con
nected respectively to the air intake of the engine, in
bustion engines e.g. diesel engines.
'
the region of the throttle valve, the air inlet 16 com
The invention provides a device for controlling a fuel
municating with the chamber 14 by way of a damping
injection pump for supplying fuel to ‘an internal com—
valve 18. The ‘diaphragm 15 is biassed to the left (as
bustion engine, which device comprises a control rod
which is movable longitudinally (eg by a governor) 15 viewed in FIGURE 1) by a compression spring 19, so
that when the engine is stationary the spring 19 positions
to control the rate of supply of fuel by the pump, a ?rst
the control rod '11 so that the pump is set for supplying
control member rotatable about an axis to move the
fuel at the normal maximum rate.
control rod longitudinally, an abutment carried by the
That normal maximum rate is determined by a con
control rod ‘for movement therewith, a second control
member movable along the said axis between a normal 20 trol member in the form of a maximum fuel stop lever
21 carried by a shaft ‘24 and having two arms 22, 23.
limiting position, in which it lies in the path of the abut
The arm 22 abuts against a stop 25 which is screw
ment to prevent the rate of supply of fuel exceeding
threaded through the casing at 26 and is provided with
a normal maximum rate, and an excess fuel position, in
a locking nut 27 so that the position of the stop 25
which it permits the abutment to be carried past the
said second control member by the control rod to per 25 may be adjusted to determine the value of the normal
maximum rate. The arm 23 of the lever 21 is engaged
mit an excess rate of fuel supply for starting the engine,
by a member 28 which secures the coupling piece 12 to
a pawl carried by the abutment or the control rod and
a rod 29 which is in turn secured to the diaphragm 15
biassed transversely of the direction of movement of
of the governor 13. The member 28, the rod 29 and the
the control rod and abutment to a limiting position in
which it co-operates with the second control member, 30 nut 29a are formed integrally and are secured to the’
diaphragm '15 by screwing the nut 29w onto the threaded
when it is in its excess fuel position, to prevent the rate
rod which passes through the centre of the diaphragm
of fuel supply from exceeding a predetermined value
15. A yoke, of which the part 43 forms one arm, ?ts
(which is preferably equal to or less than the normal
around the rod 29 between the member 28 and the nut
maximum rate), the arrangement being such that in
moving from its normal limiting position to its excess 35 29a.
The shaft 24 passes through a short hollow shaft 31
fuel position when the engine is to be started the second
which carries another control member (the engine stop
control member moves the pawl against its bias and
lever) 32 ‘for limited rotational movement about van
away from its limiting position, thereby to permit the
axis of the shaft 24. The hollow shaft 31 has secured
said excess rate of fuel supply, the pawl moving under
its bias to its limiting position when the control rod sub 40 to it a lever 35 so that the engine stop lever 32 may
be rotated in the anti-clockwise direction (as viewed in
sequently moves to reducethe rate of fuel supply to a
FIGURE 1) to abut against the coupling piece 12 to move
value equal to or less than the said predetermined value.
the control rod 11 to the right (as viewed in FIGURE
A speci?c construction of apparatus embodying the
1) for the purpose of stopping the engine. When the
invention will now be described by way of example and
with reference to the accompanying drawings in which: 45 control rod 11 is moved to its limit position to the right
it cuts off supply of fuel to the pump.
FIGURE 1 is a longitudinal sectional View,
The shaft 24 carrying the maximum fuel stop lever
FIGURE 2 is a part-sectional view on the line 2-2 of
21 is biassed to the left (as viewed in FIGURE 2) by
FIGURE 1,
a compression spring 36, and the end 37 of the shaft
FIGURE 3 is a part-sectional view on the line 3—3
24 projects to form ‘a push button. When that push
of FIGURE 2,
button is pressed it moves the shaft 24 against the action
FIGURE 4 is a part sectional view similar to FIG
of the spring 36 and carries the maximum fuel stop lever
URE 3 showing the apparatus in an excess fuel posi
21 to an excess fuel position which is shown in broken
tion, and
lines at 21a. The coupling piece 12 has pivoted to it
‘FIGURE 5 is a section with some parts omitted on the
line 5——5 of FIGURE 2.
55 at 38 a pawl 39 having an arm 39w ?xed at 3% to a
rod which forms the pivot at 38, and a lateral projecting
In this example the apparatus controls a fuel injec
head 41. One end of a spring 42 is clamped at 42a
tion pump of the type known commercially as “Simms”
(see FIGURE 5) to the rod to which is attached arm
type SPE-M or type SPE-A or type PA or type SPE-B, or
39a of the pawl 39, and the other end 4211 of the spring
as described in British patent speci?cation No. 827,678.
In these pumps the effective pumping strokes of the 60 42 (see FIGURE 2) projects into a hole in the coupling
plungers, and consequently the rate of supply of fuel
member ‘12. The pawl 39 is biassed by the spring 42
to a position in which the head 41 ‘abuts against the
part 43 of the coupling member 12, as shown in FIG
URE 2. When the maximum fuel stop lever 21 moves
segments either on the sleeves in which the plungers
reciprocate, or on the plungers, or (b) carries forks 65 from its normal limiting position to its excess fuel posi
tion 21a it moves the pawl 39 against its bias (as shown
engaging with radial arms on those sleeves or plungers,
in FIGURE 4), so that when the maximum fuel stop
so as to cause relative rotation between the plungers
lever reaches its excess fuel position it lies out of the
and sleeves when the control rod is moved longitudinally.
path of movement of the coupling member 12, and the
A helical port on the plunger cooperates with a spill
port in the sleeve so that the length of each injection 70 control rod 11 is thus moved further to the left (as
viewed in FIGURE 1) by the spring 19 and the pump
by the pump, is controlled by means of ‘a control rod
11 which is either (a) in toothed engagement with gear
period is determined by the angular relationship of the
plunger relative to the sleeve.
can then supply fuel at a rate in excess of the normal
3,093,125
maximum rate, for the purpose of starting the engine.
4
in which it is in the path of the pawl when the pawl is
As soon as the engine starts, the pneumatic governor
adjacent the abutment member, whereby longitudinal
13 then exerting minimum vacuum with lowest engine
movement in the said one direction of the control rod is
speed, pulls the control rod to the right (as viewed in
limited by abutment of the pawl against the second
FIGURE 1), and then the pawl 39 is carried ‘beyond 5 control member the pawl being at least as near as the
the maximum fuel stop lever 23 the pawl 39 is returned
abutment member to the second control member, in the
by its spring 42 back into its limiting position, as shown
longitudinal direction of the control rod, the pawl being
in FIGURE 2. With increase in engine speed the vac
moved against its bias away from its position adjacent the
uum of the pneumatic governor decreases and the spring
abutment member when the second control member is
19 then tends to push the control rod 11 to the left (as 10 moved from abutment with the abutment member along
viewed in FIGURE 1). Consequently, if the push button
the axis as aforesaid, whereby movement in the said
37 is maintained in its pressed position, or is pressed
one direction of the pawl and the abutment member
while the engine is running, the maximum rate of sup
vpast the said second control member is permitted tem
ply of fuel by the pump is determined by abutment of
porarily, and a single casing forming a continuation of
the pawl 39 against the arm 23 of the maximum fuel
the governor chamber, which casing contains the con
stop lever and, owing to the thickness of the pawl 39,
trol members, the abutment member, the pawl, the bias
that maximum rate is less than the normal maximum
sing means, and part of the control rod, the control rod
rate.
The apparatus thus permits temporarily an excess rate
of fuel delivery by the pump to the engine when the
projecting through the casing.
4. In combination with an internal-combustion engine,
a governor for controlling the speed thereof and a fuel
engine is started, but ensures that the excess rate of fuel
supply cannot be maintained or obtained once the engine
has started.
The invention is not restricted to the details of the
injection pump for supplying fuel to the engine, a control
device comprising, a control rod movable longitudinally
in both directions to control the rate of supply of fuel to
the engine, which control rod is moved under control of
I claim:
1. A control device comprising, in combination, a
control rod movable longitudinally in both directions, a
of fuel supply and in the other direction to decrease it,
foregoing example.
?rst control member rotatable about an axis to move
the control rod longitudinally, an abutment member car
the governor to move in one direction ‘to increase the rate
a ?rst control member rotatable about an axis to move
the control ‘rod longitudinally in the said other direction
to cut off the fuel supply to stop the engine, ‘an abutment
ried by the control rod for movement therewith, a pawl 30 member carried by the control rod for movement there
movable with the said abutment member, means biassing
the pawl towards a position adjacent the abutment mem
ber, a second control member normally in the path of
the abutment member, whereby longitudinal movement
in one direction of the control rod is limited by abut
ment of the abutment member against the said second
control member, the said second control member being
movable along the said axis to a position in which it is
with, a pawl movable with ‘the said ‘abutment member,
means biasing the pawl towards a position adjacent the
abutment member, a second control member normally in
‘the path of the abutment member, whereby longitudinal
movement in the said one direction of the control rod is
limited by abutment of the abutment member against
the said second control member thereby to limit the rate
of fuel supply to a normal maximum rate, the said second
control member being movable along the said axis to a
in the path of the pawl when the pawl is adjacent the
abutment member, whereby longitudinal movement in 40 position in which it is in the path of the pawl when the
the said one direction of the control rod is limited by
abutment of the pawl against the second control mem
pawl is adjacent the abutment member, whereby longi
her the pawl being at least as near as the abutment mem
rod is limited by abutment of the pawl vagainst the second
ber to the second control member, in the longitudinal
control member the pawl being at least as near as the
direction of the control rod, the pawl being moved against
its bias away from its position adjacent the abutment
member when the second control member is moved from
abutment with the abutment member along the axis as
aforesaid, whereby movement in the said one direction
of the pawl and the abutment member past the said
second control member is permitted temporarily.
tudinal movement in the said one direction of the control
abutment member to the second control member, in the
longitudinal direction of the control rod, whereby when
the pawl abuts against the second control member the
maximum rate of fuel supply ‘is not greater than the said
normal maximum rate, the pawl being moved against
its bias ‘away from‘ its position adjacent [the abutment
2. A control device as claimed in claim 1, in which
the said second control member is pivoted on the said
axis and has two arms, one of the said arms being nor
member when the second control member is moved from
‘abutment with the abutment member along the axis as
aforesaid, whereby movement in the said one direction
of the pawl and the abutment member past the said second
mally in the path of the abutment member and the other
of the said arms abutting against an adjustable stop,
mit temporarily an excess rate of fuel supply in starting
whereby the position of the said one arm relative to the
control member is permitted temporarily thereby to per
the engine.
abutment member is adjustable.
5. In combination with an internal combustion engine,
a governor for controlling the speed thereof, which gov
control rod movable longitudinally in both directions, 60 ernor includes a governor chamber for containing ?uid
3. A control device comprising, in combination, a
a governor chamber for containing ?uid, a pressure re
and a pressure responsive member responsive to pressure
sponsive member responsive to pressure of fluid in the
governor chamber, the said control rod being connected
to the pressure responsive member for longitudinal move
of ?uid in the governor chamber, and a fuel injection
pump for supplying fuel to the engine, a control device
ment thereby, a ?rst control member rotatable about an
axis to move the control rod longitudinally, an abutment
member carried by the control rod ‘for movement there
with, a pawl movable with the said abutment member,
means biassing the pawl towards a position adjacent the
abutment member, a second control member normally
in the path of the abutment member, whereby longitudi
nal movement in one direction of the control rod is
comprising, a control rod movable longitudinally in both
directions to control the rate of supply of fuel to the
engine, the said control rod being connected to the said
pressure responsive member to move in one direction to
increase the rate of fuel supply and in the other direction
to ‘decrease it, a ?rst control member rotatable ‘about an
arms to move the control rod longitudinally in the said
other direction to cut off the fuel supply to stop the engine,
an abutment member carried by the control rod for move
limited by abutment of the abutment member against
ment therewith, a pawl movable with the said abutment
the said second control member, the said second control
member, means biasing the pawl towards a position adja
member being movable along the said axis to a position 75
cent the abutment member, a second control member
3,093, 125
5
normally in the path of the abutment member, whereby
longitudinal movement in the said one direction of the
control rod is limited by abutment of the abutment mem
ber against the said second control member thereby to
limit the rate of fuel supply to a normal maximum rate,
the said second control member being movable along the
said axis to a position in which it is in the path of the.
pawl when the pawl is adjacent the abutment member,
whereby longitudinal movement ‘in the said one direction
of the control rod is limited by abutment of the pawl 10
‘against the second control member the pawl being at least
as near as the abutment member to the second control
member, in the longitudinal direction of the control rod,
whereby when the pawl abuts against the second control
member the maximum rate ‘of fuel supply is not greater 15
than (the said normal maximum rate, the pawl being
moved against its bias away from its position ‘adjacent
the ‘abutment member when the second control member is
6
moved from ‘abutment with ‘the abutment member along
the axis as aforesaid, whereby movement in the said one
direction of the pawl and the abutment member past the
said second control member is permitted temporarily
thereby to permit temporarily an excess rate of ‘fuel supply
in starting the engine, and a single casing forming a con
tinuation of the governor chamber, which casing con
tains the control members, the abutment member the
pawl, the biasing means, and part of the control rod, the
control rod projecting through the casing.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,588,560
2,716,901
2,905,020
Nicolls ______________ __ Mar. L1, 1952
Howe ________________ __ Sept. 6, 1955
Ziesche et a1 __________ __ Sept. 22, 1959‘
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