Fuel injection pump

Claim 2

A fuel injection pump comprising, in combination, housing means having a central bore closed at one end and a conduit in communication with said bore and connectable to a source of fuel, a plurality of pumping means each having a fluid passage connected to a fuel discharge line and to a fuel spill passage, each of said fuel spill passages being in communication with said bore, a drive shaft journaled in said housing and operatively connected to said pumping means, a speed responsive hydraulic governor controlled metering means including a speed responsive means and a metering valve, said metering valve being slideably and rotatably mounted in said bore, said metering valve having fluid control portions thereon operable in said bore to form therewith a fluid supply chamber in communication with said conduit, a fluid spill chamber, and a control chamber at one end of said fluid metering valve adjacent to and in communication with said fluid spill chamber, said fluid spill chamber and said control chamber being connectable to the source of fuel bypassing said fluid supply chamber, said fluid control portions including a metering helix portion cooperable with said fuel spill passages to control the flow of fluid therefrom, and a central portion separating said supply chamber from said fluid spill chamber to control the flow of fluid from said supply chamber to said spill passages and the discharge of fluid from said spill passages to said spill chamber, and said speed responsive means slideably connecting said metering valve to said drive shaft for rotation therewith and for effecting limited rotation of said metering valve relative to said drive shaft.

Claim 3

A fuel injection pump according to claim 1 wherein said speed responsive hydraulic governor controlled metering means includes biasing means connected to said metering valve for normally moving said metering valve axially in one direction and a throttle valve in fluid communication with said control chamber and directly with the source of fuel bypassing said conduit and said supply chamber to regulate the pressure of fluid in said control chamber acting on said metering valve against the biasing action of said biasing means.

Claim 4

A fuel injection pump according to claim 1 wherein said speed responsive means includes coupling means positioned coaxially relative to said drive shaft and slideably secured to said metering valve, drive means rotatably supported on said drive shaft in driving engagement with said coupling means, a flyweight governor means secured to said shaft for rotation therewith, said flyweight governor means iNcluding a pair of flyweights operatively connected to said drive means to rotate said coupling means through said drive means with said drive shaft and relative thereto in a first direction and spring means operatively connected to said coupling means to rotate said coupling means relative to said drive shaft in a second direction.

Claim 5

A fuel injection pump comprising, in combination, housing means having a central bore closed at one end to form a valve sleeve and a conduit in communication at one end with said valve sleeve and connectable at its other end to a source of fuel, a plurality of pumping means equally spaced radially around said bore, each of said pumping means having a pump chamber connected to a fuel spill passage in communication with said bore, and to a fuel discharge conduit, a drive shaft journaled in said housing and operatively connected to said pumping means, a fluid control valve axially and rotatively journaled in said sleeve, speed responsive means slideably connecting said fluid control valve to said drive shaft for rotation therewith and for limited rotation relative thereto, biasing means connected to said control valve for biasing said control valve in one direction, said fluid control valve having fluid control portions thereon operable in said sleeve to form therewith a fluid supply chamber in communication with said conduit, a fluid spill chamber and, a control chamber between one end of said fluid control valve opposite said biasing means and adjacent to the closed end of said sleeve, said fluid flow portions including a portion between said fluid supply chamber and said fluid spill chamber controlling the flow of fuel into said spill passages from said fluid supply chamber and variably controlling the flow of fluid from said spill passages to said spill chamber and passage means in said fluid control valve connecting said spill chamber and said control chamber and throttle controlled variable size orifice means positioned to control the discharge of fluid from said fluid spill chamber to the source of fuel and bypassing said conduit and said fluid supply chamber to thereby control the pressure of fluid in said control chamber acting on said control valve against the force of said biasing means.

Claim 6

A fuel injection pump comprising, in combination, housing means having a central bore closed at one end to form a valve sleeve and a conduit in communication at one end with said valve sleeve and connectable at its other end to a source of fuel, a plurality of pumping means equally spaced radially around said bore, each of said pumping means having a pump chamber connected to a fuel spill passage in communication with said bore, and to a fuel discharge conduit, a drive shaft journaled in said housing and operatively connected to said pumping means, a fluid control valve axially and rotatively journaled in said sleeve, speed responsive means slideably connecting said fluid control valve to said drive shaft for rotation therewith and for limited rotation relative thereto, biasing means connected to said control valve for biasing said control valve in one direction, said fluid control valve having fluid control portions thereon operable in said sleeve to form therewith a fluid supply chamber in communication with said conduit, a fluid spill chamber and, a control chamber between one end of said fluid control valve opposite said biasing means and adjacent to the closed end of said sleeve, said fluid flow portions including a portion between said fluid supply chamber and said fluid spill chamber controlling the flow of fuel into said spill passages from said fluid supply chamber and variably controlling the flow of fluid from said spill passages to said spill chamber and passage means in said fluid control valve connecting said spill chamber and said control chamber and throttle controlled variable size orifice means positioned to control the discharge of fluid from said fluid spill chamber to the source of fuel and bypassing said conduit and said fluid supply chamber to thereby control the pressure of fluid in said control chamber acting on said control valve against the force of said biasing means.

Claim 7

A fuel injection pump according to claim 4 wherein said means slideably connecting said fluid control valve to said drive shaft includes torsion means to normally rotatively bias said control valve in one direction with respect to said drive shaft and a speed responsive advance mechanism driven by said drive shaft for driving said control valve and for effecting limited relative rotational movement of said control valve with respect to said drive shaft as a function of the rotational speed of said drive shaft.

Claim 8

A fuel injection pump according to claim 5 wherein said speed responsive advance mechanism includes flyweights operatively connected to said drive shaft and spring means normally biasing said flyweights to an inoperative position with respect to said control valve.