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Патент USA US2110314

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March 8, 1938.
R. WISNER
2,110,314 .
PUMP FOR INJECTION ENGINES
Filed Nov. 29, 1935
2 SheetsQSheet l
Il./1lik’)
6
727 Mlswer”
W-MQ
I
March 8, 1938.
R. wlsNER
2,110,314
‘ PUMP FOR INJECTION ENGINES
Filed Nov. 29. 1955
2 Sheets—Sheet 2
Patented
's, 1938
I
'
2,110,314 I
UNITED STATES ‘PATENT OFFICE
rum FOR. INJECTION ENGlNES
René Wisner, Paris, France, assignor to Sociétév
Anonyme André Citroen, Paris, France,
Application November 29, 1935, Serial No. 52,221
'
France December 3, 1934 \
3 Claims..- (Cl. 103.—41) ,
This invention relates to improvements in ‘ cylinderf2l during longitudinal movement of'the
pumps for injecting liquid vfuel into internal com-1 pull member 3 and thereby varies the‘ angular
bustion engines of the type in which the quantity position of the inclined wall 23 to one of the
of fuel injected into each cylinder of the engine‘ inlet ports‘ 24.
'_ _ '
,
5 for one stroke of. the corresponding piston of the ~ ‘ The pull member 3 ‘is normally urged tothe
feed pump is controlled by a pull member. Or-
left by a spring; not shown, and ordinarily a
dinarily the pull member whether operated man-
?xed stop is provided for limiting the movement
ually or automatically to control the output of
the pump is associated with a ?xed stop against
10 which the pull member is constantly urged in
the direction to adjust the pump for increasedv
output.
_
of the member 3 and thereby limiting the extent
of turning movement of the'piston 22 to deter
mine the maximum output of the pump for nor- 10
mal running conditions of the engine.
‘
According to, the present invention, the usual
If the ?xed stop is ‘positioned to limit the move-
?xed stop is dispensed with and a movable stop
g, merit oi‘ the ‘pull member to the position of maxi- 4 member ‘I is positioned in the guide I for the pull
15 mum output ofr the pump for normal operation
of the engine at full power, difficulty is frequent1y experienced in starting the engine.
' '
' The object of the present invention is td‘pr'ovide a regulating device by which the stop mem-
member 3. The stop member 1 is provided with 15
a threaded stem 6v slidably'mounted in a support
4 rigidly connected with the guide I. A spring
5 arranged about the stem 6 is con?ned between
the support '4 and the stop member ‘I and -nor-/
20 her may be manually displaced beyond its posi- ' mally urges the latter to the right in opposition 20
tion of normal maximum output of the pump so
as to afford a rich fuel mixture suitable for quick-
tothe action of the spring, not shown, ‘acting
upon the pull member 3. The normal ‘position
ly “starting the engine.
of the stop member 1 is determined by a stop nut
,
,
e
In the accompanying drawings wherein an ap- 8 ?tted on- the-threaded end of the stem 6 and
25 proved embodiment ‘of the invention is illus- ' engageable with the terminal of the support 4, 25
trated:-—
Y
, >
Figure 1 is an elevation of a pump partly in
a lock ‘nut 9 being provided to secure the stop
nut in adjusted position.
a
'
.
section and showing the application of the in- ‘
vention thereto, the regulating device occupying
The extreme end of the stem'B is provided with
a pin l0 ‘engaging in-_a~slot ll, of a lever l2 piv
3 0 its normal position in which the maximum quan- - otally mounted at 13 on‘ an arm‘ I: oLthe-sup- 30
tity of fuelznecess'ary for normal operation of the
‘ enginevat all working speedsis supplied. .
Fig. 2 is a ‘view similar to Fig. 1 showing the
port 4. The end l5- of the lever 12 is adapted
’ to be connected by a suitable operating .device,
not shown, located conveniently near the oper
regulating device adjusted to increase the out- ator-of the engine, the operatingdevicebeing
35 put of the pump to facilitate starting of the en- ' capable of retaining the lever 12. in several dif- 35
gine.
.
v
'
iferent positions of adjustment.
.
.
.
Fig. 3 is a section on the line 37-3 of Fig. 1.
As shown in Fig. 1, the stop member 1 is moved
Referring to the drawings in detail, the ml- to the right-under the in?uence of the spring 5 .
meral 2| indicates one of the cylinders of the until the‘ stop nut 8 tests against the support
‘,0 pump desienated'generally at 2. the output or r 4 and the movement of the pull member 3 is thus ,40
which is controlled by a pull member 3 in the limited for the adjustment of the pistons 22 for
form of a rack connected with the accelerating the normal operation of the engine. -With this
pedal of the engine or a regulator which latter adjustment the e?ective ‘stroke of the piston is
is ‘not shown but is well known in the art. A designated A in Fig. 1. When it is desired to
45 piston 22 is-mounted in each cylinder 2| and is supply a rich fuel mixture‘for the purpose of 45
adapted during reciprocation to cover and un- starting the engine, the lever I2 is moved to the
cover the inlet ports 24 in the cylinder 2|. The ‘position shown in Fig. 2 and the stop member 1'
piston 22 is provided with a recess having an in- is displaced to -'the left thereby permitting the
clined wall 23 terminating in an’axial passage pull member 3 to follow the stop member and ad-’
.
50 26 adapted to establish communication between just the pistons" to the position to increase the 50
one of the inlet ports 24 and the pressure chamber 25 of the pump cylinder. ‘The teeth otthe
pull member 3 mesh with a toothed member 21
connected with the piston 22 whereby the latter
l v is turned about its longitudinal axis within the
e?ective strokes as‘ indicated at B in Fig. v2.
'WhatI claim is:
t -
1
'
‘
.
1. In a regulating device for a pump for in
jecting liquid fuel in- internal combustion engines
in which a sliding pull member is constantly 55
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