Fuel injection pump

Claim 2

A fuel injection pump for an air throttled internal combustion engine comprising in combination: a housing; fuel supply means communication with the housing; means forming a plurality of fuel receiving bores within the housing and including fluid discharge communication means between said bores and said engine and further including a plurality of spill passage means for communicating the bores with the fuel supply means; a plurality of plungers received within the bores in a one-toone relationship therewith; a metering valve means arranged to close the spill passage means in a selected sequence; drive means adapted to be driven by the engine and including means for driving said metering valve to thereby sequentially close said spill passage means in the selected sequence and means for reciprocating said plungers within said bores; and means responsive to the engine, operable to control the quantity of fuel pumped to the engine by said plungers; said engine responsive means including speed responsive means within said housing operatively coupled to said metering valve and arranged to controllably vary the phase relationship between spill passage means closure events and engine operation whereby the spill passage means closure event may be advanced with increasing engine speed over selected ranges of engine operation; said means for reciprocating the plungers including rotary drive means arranged to engage said plungers, operative upon rotation to reciprocate said plungers within said bores; said rotary drive means including a contoured cam actuating surface for engagement with said plungers, the contour of said cam actuating surface being selected to provide plunger displacement velocities which do not decrease for drive means rotational positions corresponding to substantially all possible rotational positions of spill port closure by said metering valve means, whereby the cam actuating surface cooperates with the advance of the metering valve means and the concomitant advance of the spill passage means closure events to provide a Fuel delivery characteristic which closely matches the air flow characteristic of the engine over substantially the entire speed range of the engine.

Claim 3

The fuel injection pump of claim 1 wherein said cam actuating surface is contoured to provide for an increasing velocity of plunger displacement for a major portion of the angular rotation of said rotary drive means prior to attainment of plunger top dead center within the plunger bore.

Claim 4

The fuel injection pump of claim 1 wherein the cam actuating surface is arranged to provide for a maximum velocity of plunger displacement at an angular position substantially corresponding to the angular position of the spill port closing event most closely approaching plunger top dead center.

Claim 5

The fuel injection pump of claim 3 wherein the cam actuating surface is arranged to provide for a velocity of plunger displacement which is increasing for substantially all of the cam means angular rotation corresponding to the total potential spill port closure.

Claim 8

A fuel injection pump assembly, for an air throttled internal combustion engine comprising, in combination: a stationary housing having a central bore and a source of fluid under pressure connected to said bore; a rotatable drive shaft member mounted in said bore; drive shaft driven fluid pumping means having a plurality of fluid discharge passages each connected in parallel to a fluid discharge injection line and to a fluid spill line communicating with said bore, said spill line receiving fluid from and spilling fluid into said bore; a drive shaft driven fluid metering valve member slidably and rotatably mounted in said bore between said source and said spill lines; means connecting said metering and drive shaft members for limited relative axial and rotational movements therebetween; said metering member having fluid flow control portions thereon variably controlling the flow of fluid through said spill lines as a function of the axial and rotative movements of said metering member; movable external control means; means responsive to movement of said external control means in one direction for moving said drive shaft and metering members axially in a spill line closing direction; and speed responsive governor means coaxially disposed about and driven by said drive shaft member for moving said metering member axially in an opposite, spill line opening, direction; said limited movement connection between said metering and drive shaft members including a cam elemenT and cam follower element operably engaged and connected respectively one element to each of the said metering and shaft members whereby rotation of said drive shaft member above a first predetermined speed effects a relative rotation between said members to vary the scheduling of control of said spill lines by said metering member; said drive shaft driven fluid pumping means including a plurality of piston members arranged for reciprocation within a plurality of pumping cylinders and a rotary piston actuator having contoured drive surface, said drive surface having a fluid pumping segment for providing a piston displacement velocity which does not decrease for rotation of the drive surface through angular positions of rotation corresponding with substantially all possible scheduling of the control of the spill lines by said metering member whereby said fluid pumping segment and said limited motion connection may be made cooperative to provide a rate of fluid pumping substantially proportional to the rate of air consumption by the engine.

Claim 9

A fuel injection pump assembly, for an air throttled internal combustion engine comprising, in combination: a stationary housing having a central bore and a source of fluid under pressure connected to said bore; a rotatable drive shaft member mounted in said bore; drive shaft driven fluid pumping means having a plurality of fluid discharge passages each connected in parallel to a fluid discharge injection line and to a fluid spill line communicating with said bore, said spill line receiving fluid from and spilling fluid into said bore; a drive shaft driven fluid metering valve member slidably and rotatably mounted in said bore between said source and said spill lines; means connecting said metering and drive shaft members for limited relative axial and rotational movements therebetween; said metering member having fluid flow control portions thereon variably controlling the flow of fluid through said spill lines as a function of the axial and rotative movements of said metering member; movable external control means; means responsive to movement of said external control means in one direction for moving said drive shaft and metering members axially in a spill line closing direction; and speed responsive governor means coaxially disposed about and driven by said drive shaft member for moving said metering member axially in an opposite, spill line opening, direction; said limited movement connection between said metering and drive shaft members including a cam elemenT and cam follower element operably engaged and connected respectively one element to each of the said metering and shaft members whereby rotation of said drive shaft member above a first predetermined speed effects a relative rotation between said members to vary the scheduling of control of said spill lines by said metering member; said drive shaft driven fluid pumping means including a plurality of piston members arranged for reciprocation within a plurality of pumping cylinders and a rotary piston actuator having contoured drive surface, said drive surface having a fluid pumping segment for providing a piston displacement velocity which does not decrease for rotation of the drive surface through angular positions of rotation corresponding with substantially all possible scheduling of the control of the spill lines by said metering member whereby said fluid pumping segment and said limited motion connection may be made cooperative to provide a rate of fluid pumping substantially proportional to the rate of air consumption by the engine.

Claim 10

A fuel injection pump assembly for an air-throttled internal combustion engine comprising, in combination: a centrally bored housing; a source of fluid in fluid communication with said bore; an axially movable rotatable drive shaft member extending through said bore; drive shaft driven fluid pumping means arranged to be driven by the engine in relation to engine operational events and having a plurality of fluid spill lines connected at one end to discharge outlets and at their other ends to said bore to receive fluid from said source and to spill fluid into said bore; a valve member slidably and rotatably mounted in said bore surrounding said drive shaft member and having a lost motion connection thereto; said valve member having a fluid metering helix portion thereon variably closing said spill lines as a function of the axial and rotative movements of said valve member to control flow volume of fluid to said outlets; movable external control means connected to said drive member for moving it and said valve member axially; speed responsive governor means coaxially disposed about and driven by said drive shaft member for moving said valve member axially, said lost motion connection providing a relative rotation between said valve member and said drive member upon movement of said speed responsive means in a selected speed range to provide a variable control of the phasing of the closure event of said spill lines by said valve member with respect to engine operational events, whereby the discharge of fluid by the pump may be advanced in time with respect to engine operation; said drive shaft driven fluid pumping means further including a plurality of pumping cylinders having plungers disposed therein and a rotary actuator driven in synchronism with said drive member; said rotary actuator having an actuating surface arranged to reciprocate said plungers within their cylinders and contoured to provide a velocity of plunger displacement which does not decrease for substantially all possible spill port closure events whereby said fluid pumping segment and said limited motion connection may be made cooperative to provide a rate of fluid pumping substantially proportional to the rate of air consumption by the engine.

Claim 11

A fuel injection pump assembly for an air-throttled internal combustion engine comprising, in combination: a centrally bored housing; a source of fluid in fluid communication with said bore; an axially movable rotatable drive shaft member extending through said bore; drive shaft driven fluid pumping means arranged to be driven by the engine in relation to engine operational events and having a plurality of fluid spill lines connected at one end to discharge outlets and at their other ends to said bore to receive fluid from said source and to spill fluid into said bore; a valve member slidably and rotatably mounted in said bore surrounding said drive shaft member and having a lost motion connection thereto; said valve member having a fluid metering helix portion thereon variably closing said spill lines as a function of the axial and rotative movements of said valve member to control flow volume of fluid to said outlets; movable external control means connected to said drive member for moving it and said valve member axially; speed responsive governor means coaxially disposed about and driven by said drive shaft member for moving said valve member axially, said lost motion connection providing a relative rotation between said valve member and said drive member upon movement of said speed responsive means in a selected speed range to provide a variable control of the phasing of the closure event of said spill lines by said valve member with respect to engine operational events, whereby the discharge of fluid by the pump may be advanced in time with respect to engine operation; said drive shaft driven fluid pumping means further including a plurality of pumping cylinders having plungers disposed therein and a rotary actuator driven in synchronism with said drive member; said rotary actuator having an actuating surface arranged to reciprocate said plungers within their cylinders and contoured to provide a velocity of plunger displacement which does not decrease for substantially all possible spill port closure events whereby said fluid pumping segment and said limited motion connection may be made cooperative to provide a rate of fluid pumping substantially proportional to the rate of air consumption by the engine.