[특허]Fuel injection pump

Ford Motor Company

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Fuel injection pump

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02M-041/00 F02M-059/00
미국특허분류(USC)	123/506; 123/458; 123/451; 417/505; 417/516
출원번호	US-0689270 (1985-01-07)
발명자 / 주소	Schechter, Michael M. Simko, Aladar O.
출원인 / 주소	Ford Motor Company
대리인 / 주소	Sadler, Clifford L.McCollum, Robert E.
인용정보	피인용 횟수 : 8 인용 특허 : 7

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A fuel injection pump of the radial plunger, spill port type includes electromagnetic means for opening and closing the spill port to control the pressurization of fuel for injection of fuel to the individual engine cylinders; a single solenoid assembly controlling the flow of fuel to and from a pair of pumping plungers in response to the movement of a shuttle valve mechanism; in one embodiment, a single retraction type delivery valve is used in connection with each pumping plunger and, in a separate embodiment, a single retraction type delivery valve is...

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1. A fuel injection pump of the multiple plunger spill port type for an automotive type internal combustion engine, the pump including a housing having a central cavity therein receiving a rotatable engine driven camshaft, a pair of axially spaced stationary pump plunger bores each projecting radially through the housing from the camshaft and each reciprocably mounting a plunger engageable with the camshaft for movement thereby upwardly through a fuel pumping stroke and downwardly through a fuel intake stroke, each bore defining a fuel chamber contiguous to the plunger end opposite to that engaged by the camshaft, each bore having a fuel inlet/spill passage through the wall of the bore contiguous to each chamber for the supply of fuel to and the spill of fuel therefrom, a fuel discharge passage containing fuel pressure responsive means therein connecting each of the chambers individually to an engine cylinder, a source of low pressure fuel, fuel supply lines connecting the source to each of the fill/spill passages and fuel chambers, a low pressure fuel return line, a spill port in the line connected in parallel fuel flow relationship to each of the fill/spill passages, and spill port fuel flow control valve means moveably associated with the supply and return lines to block or permit flow therethrough to control the pressurization of fuel in one of the fuel chambers and its discharge line while supplying fuel at low pressure to another of the chambers, and vice versa, the valve means including a single spill control valve movable to block or unblock the spill port, electromagnetic means energizable to move the spill valve to a spill port blocking position, and a shuttle valve reciprocably movable between a first position connecting one of the pair of fill/spill passages to the supply line and source and the other of the pair of fill/spill passages to the spill port and return line, and vice versa for a second position, the shuttle valve being fuel pressure movable to its reciprocable positions as a function of the pumping movement of the respective plungers associated therewith directing fuel against various opposite portions of the shuttle valve. 2. A pump as in claim 1, the shuttle valve including a valve bore having an outlet connected to the spill port and a pair of inlets connected one to each of the fill/spill passages, the selective energization of the electromagnetic means closing the spill port during the pumping stroke of one of the pair of plungers to effect pressurization of its associated fuel chamber and the discharge of fuel to the engine cylinder associated therewith simultaneous with the intake stroke of the other of the pair of plungers supplying fuel to its respective fuel chamber. 3. A pump as in claim 1, wherein each bore contains a retraction type fuel delivery valve contiguous to its fuel chamber and concentrically arranged within the bore to close one end thereof, the delivery valve connecting the latter chamber and discharge passage and being openable upon the attainment of a predetermined fuel pressure in the chamber to supply fuel to the engine cylinder. 4. A pump as in claim 1, including a preloaded retraction type delivery valve in the discharge passage upstream of the engine cylinder openable above a predetermined fuel pressure in the fuel chamber to supply fuel to the cylinder. 5. A pump as in claim 1, wherein the electromagnetic means includes a solenoid having a movable armature secured to the spill valve, and spring means lightly biasing the spill valve to a position closing the spill port and effecting a pressure buildup in the fuel chamber connected at that time thereto by the shuttle valve. 6. A pump as in claim 1, wherein the electromagnetic means includes a solenoid having a movable armature secured to the spill valve, spring means lightly biasing the spill valve to a position closing the return line effecting a pressure buildup in the fuel chamber connected at that time thereto by the shuttle valve, the force of the spring means being below the predetermined opening pressure force of the delivery valve to effect opening of the return line prior to opening of the delivery valve as long as the solenoid is deenergized. 7. A pump as in claim 2, the valve bore including fuel plenums at opposite ends of the shuttle valve constituting the fuel inlets each connected to a different plunger fuel chamber, the spill port being connected to the valve bore between the plenums to direct fuel to and receive fuel from either plenum as a function of the position of the shuttle valve, the fuel pressure differential between plenums urging the shuttle valve in one direction or the other as a function of the position of the shuttle valve. 8. A pump as in claim 2, the source of fuel including a pair of fuel supply lines connected to the valve bore on opposite sides of the spill port to supply fuel to the individual fuel chambers as a function of the position of the shuttle valve. 9. A pump as in claim 8, including a spring loaded check valve associated with the supply lines to maintain a minimum fuel pressure in the lines against the spill valve and shuttle valve biasing the spill valve open and the shuttle valve in one direction. 10. A pump as in claim 1, including a spring closed check valve in the return line downstream of the spill valve establishing a minimum fuel pressure force against the shuttle valve biasing the shuttle valve in one direction in response to fuel pressure thereagainst by fuel from a plunger moving through its pumping stroke. 11. A pump as in claim 4, including a spring closed check valve in the return line downstream of the spill valve establishing a minimum fuel pressure force against the spill valve biasing the spill valve open, the force biasing the spill valve open being less than the predetermined fuel pressure level for opening the delivery valve. 12. A pump as in claim 1, the shuttle valve including a housing having a bore defining a fuel plenum at opposite ends, each fuel plenum being connected to a different plunger fuel chamber, a centrally located fuel annulus fuel connected to the spill port and return line, and a plurality of fuel supply annuli between the plenums essentially equally spaced on opposite sides of the centrally located annulus, the bore reciprocably receiving therein the shuttle valve consisting of a sleeve type valve having a central partition dividing the valve into two axially extending bores each open to a different plenum, a pair of inlets through the sleeve contiguous to the partition and on opposite sides thereof whereby movement of the valve in one direction or the other aligns one of the inlets with the fuel spill port while aligning the other of the pair of inlets with one of the fuel supply annuli for the supply of fuel to the plenum and plunger fuel chamber associated therewith, and vice versa when the valve is moved in the opposite direction, the force of the fuel under pressure in one plenum during the pumping stroke of the plunger associated therewith creating a pressure differential between plenums biasing the shuttle valve to the position connecting the pressurized fuel to the spill port return line whereupon simultaneous energization of the electromagnetic means closes the return line and permits further pressurization of the fuel in the fuel chamber associated with the respective plenum. 13. A pump as in claim 1, the spill valve being movable into the spill port to a closed position blocking the return line, the fuel pressure acting on the spill valve in its closed position opposing the force of the electromagnetic means that forces the spill valve closed, the spill valve having a central bore therein directing fuel from the end blocking the return line to an opposite differential area end of the spill valve to apply fuel pressure thereto to balance the fuel pressure force on the opposite end and thereby reduce the force of the electromagnetic means necessary to a force only slightly greater than the means biasing the spill valve to an open position. 14. A pump as in claim 12, the shuttle valve sleeve having a pair of annular fuel grooves located one to each side of the spill port, a further conduit connected at one end to the spill port having branch passages connected in parallel flow relationship to each of the annular fuel grooves, a fuel delivery valve in the conduit upstream of the branch passages, the pair of fuel grooves being alignable one at a time with further fuel passages each connected to an engine cylinder as a function of movement of the shuttle valve in one direction or the other to deliver pressurized fuel past the delivery valve first to one cylinder and subsequently to the other upon reciprocatory movement of the shuttle valve. 15. A pump as in claim 1, wherein a single retraction type delivery valve assembly is operatively fluid associated with the shuttle valve for controlling fuel flow from a pair of plungers to a pair of engine cylinders on a one-to-one basis in response to reciprocatory movement of the shuttle valve, the delivery valve assembly including a single fuel inlet line connected to the plunger fuel chambers in one flow path through the shuttle valve and a pair of branch outlet lines each connected to a separate discharge passage in another path past the shuttle valve.

이 특허에 인용된 특허 (7)

이 특허를 인용한 특허 피인용횟수: 8

이 특허와 함께 이용한 콘텐츠

[특허] Injection pump for fuel injection systems with control led injectors for i.c. engines 함께 이용한 콘텐츠

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Fuel injection pump

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이 특허에 인용된 특허 (7)

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Fuel injection pump

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이 특허에 인용된 특허 (7)

이 특허를 인용한 특허 피인용횟수: 8

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