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Патент USA US2411103

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‘ Nov. 1-2, 1946.
A. E. MQREILLON ET AL
'
2,411,103
PRIMING OF INTERNAL-COMBUSTION ENGINES
Filed Feb. 15, 1945
2 Sheets-Sheet v1
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J. lAvHUNT
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NOV- 12, 1945-
A. E. MOREILLON ET AL
'
2,411,103
PRIMING OF INTERNAL-COMBUSTION ENGINES ‘
Filed Feb. 15, 1945.
’ VZD'SheetS-Sheet 2"
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Patented Nov. 12, 1946
2,411,103
UNITED‘ STATES“ PATENT OFFICE,
' 2,411,103
PRIMING 0F INTERNAL-COMBUSTION
ENGINES
Albert Edmund Moreillon and Joseph‘ Anthony
Hunt, Redditch, England, assignors to The
Heywood Compressor Company Limited, Red
ditch, England, a British company
Application February 15, 1945, Serial No. 578,098
In Great Britain September 1, 1944
4 Claims.
1
,
(Cl. (123-180)
This invention has for its object to provide
improved means for priming internal combustion
engines and particularly the engines of aircraft.
It is important that the quantity of petrol or
2
piston a upwards to effect delivery. Such com
pressed air also holds the atmospheric or ex
haust valve g on its seat. The valve 9 is loaded
by a spring it within a bobbin i which has an
fuel injected shall be de?nitely known and that 5 annular rib 9' therearound which cooperates with
it can be proportioned by the operator or pilot
to suit the engine requirements.
a spring loaded ball I; to constitute a snap de
vice to hold the bobbin down on the valve g or
to hold it raised with the valve lifted‘cl‘ear of
In accordance with our present invention, we
provide a, pneumatically operated petrol pump
its seat. The stem m of the valve g has a cross
for priming purposes which is so controlled that 10 pin 11. therein which when the bobbin i is raised
it must perform one complete delivery and re
is engaged by the bobbin in order to lift the valve
turn stroke at each operation and cannot be '
g off its seat. There is a stem 0 secured to the
caused to commence a second delivery stroke
top of the bobbin 2' and this stem projects through
until the return stroke is completed.
The invention further consists in a priming
the piston a into the space p where the stem
has a nut or collar q adjustably secured thereon.
system for an internal combustion engine com
When the piston a is forced upwards by com
prising a pneumatically operated piston type fuel
pressed air in the space 1* in order to effect petrol
pump with a spring return or suction stroke,
delivery, the valve g is held on to its seat by the
with the piston coupled to the compressed air
air pressure until the internal shoulder s in the
exhaust valve in combination with a snap action 20 piston abuts against the collar q on the stem 0,
mechanism for such valve, so that the valve is
when the piston raises the stem 0, which in turn
opened only at the end of the piston delivery
raises the bobbin 2' and the stem m of the valve 9.
stroke and closed only at the end of the piston
The latter is therefore opened and the compressed
suction stroke.
air allowed to escape to exhaust. The spring I)
The invention further consists in a priming 25 now depresses the piston or which draws petrol
system for an internal combustion engine, in
into the cylinder 0 past the inlet valve 11. As the
which the exhaust valve is held closed by the
piston approaches the end of its suction stroke,
compressed air and the snap action mechanism,
it presses on the shoulder u of the stem 0 and
opened by the piston through a lost motion con
forces the bobbin 1' downwards to close the valve
nection at the end of its delivery stroke and 30 9. When the bobbin 2' is raised, the rib 9' de
closed by the piston which overcomes the snap
presses the ball k which then snaps back on the
‘ action mechanism at the end of the suction
opposite side of the rib. When the bobbin is low
stroke.
ered, a reverse action takes place and the ball
The invention further consists in a priming
returns to the position shown in the ?gure where
system for an internal combustion engine, hav 35 the bobbin is held down on to the valve g. ri‘he
ing a push button operated compressed air valve
valve 9 is therefore opened only when the pump '
for delivering compressed air to the priming pump
a completes its delivery stroke and closed when
to effect the delivery stroke of the latter, the suc
the pump completes its suction stroke.
tion stroke being effected by spring pressure, a
The control of the flow of compressed air to
piston ,operatively connected to the compressed 40 the pump inlet 7‘ is effected by a valve 11 loaded
air valve retaining such valve open so long as air
by a spring w and pushed off its seat by a stem an
pressure is maintained in the delivery connection
attached to a piston y which is held in its raised
from valve to pump, the latter being operatively
position by a spring .2 and is depressed by a push
connected to the compressed air exhaust valve.
button 2 and stem 3. The air inlet to the valve
45 ?tting is at 4. When the valve '0 is open, air
In the accompanying drawings:
Figure 1 is a diagram of an engine priming
passes not only to the outlet pipe 5 but also by
system arranged in one convenient form in ac
Way of the passage 6 to the top of the piston "I,
cordance with this invention.
so that such piston is held in the depressed po~
Figure 2 is a sectional view of the priming
jsition to which it is moved by the push button 2
pump and its control device shown in Figure 1.
50 so long as there is compressed air in the pipe 5,
The piston a of the priming pump is loaded
that is so long as the piston a of the petrol pump
by the spring I) in the petrol cylinder 0 which
is on its delivery stroke. Immediately the valve
has a petrol inlet valve at d and a petrol outlet
9 is opened and the air pressure released, the
valve at e,
spring a raises the piston y and with it the stem
Compressed air is admitted at f to force the 55 :1: so that the valve 1; is allowed to close.
2,411,103
3
4 .
the suction stroke, with the piston coupled to
It follows therefore that once the push button
2 has been depressed, the valve 2; is held open by
the piston y until the pump piston a has com
a compressed air exhaust valve in combination
with a snap action mechanism for such valve,
pleted its delivery stroke and opened the exhaust
so that the valve is opened only at the end of '
valve g.
the piston delivery stroke-and closed only at the
j
'
'
The delivery from the pump valve e is to
priming sprayers or injectors 8 in the engine _,
induction manifold 9, and in Figure 1, l 0 indicates
the priming fuel supply tank, and H a com
pressed air supply vessel.
,
With our improvement, the operator or pilot
will give as many effective pushes to his push
button as he requires strokes of petrol tobe in
jected for priming purposes and he‘ cannot give
half or partial strokes to his priming pump.
10
15
end of the piston suction stroke.
Y
3. A priming system for an internal combus
tion engine as claimed in claim 2, in which the
exhaust valve is held closed by the compressed
air and the snap action mechanism, opened by
the piston through a lost motion connection at
the end of its delivery stroke and closed by the
piston which overcomes the snap action mechanism at the end of the suction stroke.
4. In a priming system for an internal com
bustion engine according to claim 2, a push but
ton operated compressed air valve for delivering
1. A priming system for an internal combus
compressed air to said fuel pump to e?ect the
tion engine comprising a pneumatically operated
delivery stroke of the latter, the suction stroke
fuel pump with a spring return for the suction
stroke, and a control device so arranged that the 20 being effected by spring pressure in said ‘pump.
a piston operatively connected to the compressed
pump must perform one complete delivery and
air valve retaining such valve open so long as air
'return stroke at each operation and cannot be
,pressure is maintained in the delivery connection
caused to commence a second delivery stroke
from valve to pump, the latter being operatively
until the returnstroke is completed.
2. A priming system for an internal combus 25 connected to said compressed air exhaust valve.
What we claim is:
, tion engine comprising a pneumatically operated
piston type fuel pump with a spring return for
ALBERT EDMUND MOREILLON.
JOSEPH ANTHONY HUNT.
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