Distributor type fuel injection pump

In a fuel injection pump having a non-rotating pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a cam axis, a plunger mounted in each plunger bore for reciprocation, with an inner end face of the plunger facing inwardly toward the pumping chamber, annular cam means surrounding the plungers and rotatable about the cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber and delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, a dual purpose valve member, valve actuating means for actuating the valve member for supplying intake charges of fuel to the pumping chamber during the intake phases and spilling fuel from the pumping chamber during the pumping phases, a plurality of distributor outlets and a delivery system for delivering a high pressure charges of fuel from the pumping chamber to the distributor outlets;

• the improvement wherein the pumping chamber has at least four of said plunger bores, wherein a plurality of the plungers serve as distributor valves in sequence, connecting the distributor outlets in sequence directly to the pumping chamber;
• wherein the delivery system comprises separate and independent passage means for each distributor valve for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets;
• the separate and independent passage means for the plurality of distributor valves comprising a plurality of distributor ports for the plurality of distributor outlets respectively, each in a distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for each respective distributor port and forming the sole means, in each distributor position thereof, opening the distributor port to the pumping chamber adjacent said inner end face of the distributor valve for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet;
• wherein the annular cam means is operable during each pumping phase to position one distributor valve in a distributor position thereof to distribute the high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet and to actuate at least two of the remaining plungers to deliver a high pressure charge of fuel from the pumping chamber;
• wherein the pump body has a coaxial valve bore, wherein the plunger bores extend radially inwardly to the valve bore, and wherein the dual purpose valve member is mounted in the valve bore between the inner ends of the plunger bores and is axially shiftable in the valve bore between open and closed axial positions thereof.

A fuel injection pump having a non-rotating pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a cam axis, a plunger mounted in each plunger bore for reciprocation, with an inner end face of the plunger facing inwardly toward the pumping chamber, annular cam means surrounding the plungers and rotatable about the cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber and delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, a plurality of the plungers serving as distributor valves in sequence, connecting the distributor outlets in sequence directly to the pumping chamber;

• a dual purpose valve member, valve actuating means for actuating the valve member for supplying intake charges of fuel to the pumping chamber during the intake phases and spilling fuel from the pumping chamber during the pumping phases, a plurality of distributor outlets and a delivery system, comprising separate and independent passage means for each distributor valve, for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets, the separate and independent passage means for the plurality of distributor valves comprising a plurality of distributor ports for the plurality of distributor outlets respectively, each in a distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for each respective distributor port and forming the sole means, in each distributor position thereof, opening the distributor port to the pumping chamber adjacent said inner end face of the distributor valve for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet;
• the annular cam means and plungers cooperating to distribute the high pressure charges of fuel from the pumping chamber, via the distributor valve bores and distributor ports, directly to the distributor outlets;
• the pump body having a coaxial valve bore between the plunger bores, the plunger bores extending radially inwardly to the valve bore, and the dual purpose valve member being mounted in the valve bore between the inner ends of the plunger bores and being axially shiftable in the valve bore between open and closed axial positions thereof by the valve actuating means.

In a fuel injection pump having a non-rotating pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a cam axis, a plunger mounted in each plunger bore for reciprocation, with an inner end face of the plunger facing inwardly toward the pumping chamber, annular cam means surrounding the plungers and rotatable about the cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber and delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, a valve member, actuating means for selectively actuating the valve member for supplying an intake charge of fuel to the pumping chamber during the intake phase, a plurality of distributor outlets and a delivery system for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets;

• the improvement wherein the pumping chamber has a t least four plunger bores and wherein at least four plungers serve as distributor valves in sequence, connecting the distributor outlets in sequence directly to the pumping chamber;
• wherein the delivery system comprises separate passage means for each distributor valve, for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets, the separate passage means for the distributor valves comprising a plurality of distributor ports for the plurality of distributor outlets respectively, each in a different distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for the respective distributor port and forming the sole means, in the distributor position thereof, opening the distributor port directly to the pumping chamber adjacent the inner end face of the distributor valve for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet;
• wherein the annular cam means and plungers cooperate to distribute the high pressure charges of fuel from the pumping chamber, via the distributor valve bores and distributor ports, directly to the distributor outlets in sequence;
• wherein the pump body has a coaxial throughbore providing a coaxial valve bore between the plunger bores, and wherein the valve member is axially shiftable in the valve bore between open and closed axial positions thereof by the valve actuating means.

In a fuel injection pump having a non-rotating pump body with a pumping chamber with a plurality of plunger bores, a plunger mounted in each plunger bore for reciprocation, with one end face of the plunger facing toward the pumping chamber, rotary cam means rotatable about a cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber and delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, valve means for supplying intake charges of fuel to the pumping chamber during the intake phases, a plurality of distributor outlets and a delivery system for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets;

• the improvement wherein a plurality of the plungers serve as distributor valves in sequence, connecting the distributor outlets in sequence directly to the pumping chamber;
• wherein the delivery system comprises a plurality of distributor ports for the plurality of distributor outlets respectively, each in a different distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for the respective distributor port and, in its distributor position, at least partly uncovering the distributor port at said one end face of the distributor valve to open the port to the pumping chamber for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet;
• wherein a plurality of the plungers serve as pumping plungers;
• and wherein the rotary cam means is operable during each pumping phase to actuate a plurality of the pumping plungers to deliver a high pressure charge of fuel from the pumping chamber and to position one distributor valve in the distributor position thereof to distribute the high pressure charge of fuel to the respective distributor outlet.

A fuel injection pump having a non-rotating pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a cam axis, a plunger mounted in each plunger bore for reciprocation, with an inner end face of the plunger facing inwardly toward the pumping chamber, annular cam means surrounding the plungers and rotatable about the cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber an delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, a plurality of distributor outlets, the plungers serving as distributor valves in sequence connecting the distributor outlets in sequence directly to the pumping chamber;

• a plurality of distributor ports for the plurality of distributor outlets respectively, each in a different distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for the respective distributor port and forming the sole means, in the distributor position thereof, at least partly uncovering the distributor port at said inner end face of the distributor valve to open the port to the pumping chamber for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet;
• the annular cam means and plungers cooperating to distribute the high pressure charges of fuel from the pumping chamber, via the distributor valve bores and distributor ports, directly to the distributor outlets;
• the pump body having a coaxial through bore providing a valve bore between the plunger bores, a valve member mounted in the valve bore between the plunger bores and axially shiftable in the valve bore between open and closed axial positions thereof;
• and valve actuating means for selectively axially shifting the valve member to its open position for supplying an intake charge of fuel to the pumping chamber.

In a fuel injection pump having a pump body with a pumping chamber with a plurality of plunger bores angularly spaced around and having axes extending generally radially outwardly from a cam axis, a plunger mounted in each plunger bore for reciprocation, with an inner end face of the plunger facing inwardly toward the pumping chamber, annular cam means surrounding the plungers and rotatable about the cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber and delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, valve means selectively operable for supplying an intake charge of fuel to the pumping chamber during the intake phase and spilling fuel from the pumping chamber during the pumping phase, a plurality of distributor outlets and a delivery system for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets;

• the improvement wherein a plurality of the plungers serve as distributor valves in sequence, connecting the distributor outlets in sequence directly to the pumping chamber;
• wherein the delivery system comprises a plurality of distributor ports for the plurality of distributor outlets respectively, each in a distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for each respective distributor port and forming the sole means, in each distributor position thereof, opening the distributor port to the pumping chamber adjacent said inner end face of the distributor valve for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet;
• wherein the annular cam means and plungers cooperate to distribute the high pressure charges of fuel from the pumping chamber, via the distributor valve bores and distributor ports, directly to the distributor outlets;
• wherein the pump body has a coaxial bore forming a valve bore between the plunger bores, wherein the plunger bores extend radially inwardly to the valve bore, and wherein the valve means comprises a valve member mounted in the valve bore and axially shiftable in the valve bore between open and closed axial positions thereof.

In a fuel injection pump having a fixed pump body with a pumping chamber with a plurality of plunger bores, a plunger mounted in each plunger bore for reciprocation, with one end face of the plunger facing toward the pumping chamber, rotary cam means rotatable about a cam axis for reciprocating the plungers to provide alternating intake and pumping phases of operation for respectively supplying an intake charge of fuel to the pumping chamber and delivering a charge of fuel from the pumping chamber at high pressure for fuel injection, valve means for supplying intake charge of fuel to the pumping chamber during the intake phases, a plurality of distributor outlets and a delivery system for delivering the high pressure charges of fuel from the pumping chamber to the distributor outlets;

• the improvement wherein the pumping chamber has at least four of said plunger bores, wherein all of the plungers serve as distributor valves in sequence, connecting the distributor outlets in sequence directly to the pumping chamber;
• wherein the delivery system comprises a plurality of distributor ports for the plurality of distributor outlets respectively, each in a distributor valve bore, for connecting the bore to the respective distributor outlet;
• each distributor valve having a distributor position for each respective distributor port and forming the sole means, in each distributor position thereof, opening the distributor port to the pumping chamber at said one end face of the distributor valve for connecting the respective distributor outlet directly to the pumping chamber for delivering a high pressure charge of fuel from the pumping chamber, via the distributor valve bore and distributor port, directly to the respective distributor outlet;
• wherein all of the plungers serve as pumping plungers;
• and wherein the rotary cam means is operable during each pumping phase to actuate a plurality of the pumping plungers to deliver a high pressure charge of fuel from the pumping chamber and to position one distributor valve in a distributor position thereof to distribute the high pressure charge of fuel to the respective distributor outlet.