Патент USA US2411103код для вставки
‘ 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 /l/ k \ 63 ' INv ENTQRS A .E. MORE \ LLQN $0 J. lAvHUNT ATTYS. NOV- 12, 1945- A. E. MOREILLON ET AL ' 2,411,103 PRIMING OF INTERNAL-COMBUSTION ENGINES ‘ Filed Feb. 15, 1945. ’ VZD'SheetS-Sheet 2" 1 6/ Fig.2 3 ' 11% v elm/Logos . ' I 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.