Fuel injector pump and limiting speed governor for internal combustion engine

Claim 2

In the combination of a variable delivery rate fuel injector pump and a speed-limiting governor for an engine having desired maximum no-load and full-load operating speeds, with said maximum full-load speed being approximately midrange between the engine''s idling speed and said maximum no-load speed; said pump having a rotatively adjustable plunger with a helix determinative of the Pump delivery rate in accordance with the adjusted rotative position of the plunger; said helix having a first angle of inclination effecting the determination of pump delivery rate over the relatively lower portion of the range of delivery rate of the pump, and having a second angle of inclination effecting said determination over the relatively higher portion of the range of pump delivery rate; and a plunger-rotating rack movable through the range from minimum to full pump delivery rate; said governor comprising engine speed-sensing means, a member movable by said sensing means in response to change in engine speed, and resilient means yieldingly opposing increasing engine speed movements of said member above said maximum full-load speed; said rack being connected to said member for actuation in response to movement of said member by said sensing means; said resilient means having sufficient stiffness to prevent movement of said member by said sensing means in response to increasing engine speed up to said maximum full-load speed, and a load-deflection rate accommodating sufficient movement of said member by said sensing means to actuate the rack to the end of its range for minimum pump delivery rate at said maximum no-load speed.

Claim 3

The invention of claim 1, wherein said first angle of inclination of said helix is substantially steeper than said second angle of inclination thereof.

Claim 4

In the combination of a plunger-type fuel injector pump and a speed-limiting governor for a compression ignition engine having an idling speed and a maximum desired speed; the pump having a fuel supply chamber, a plunger having a circumferentially extending metering groove spaced from one end thereof and a passage connecting said end to the groove, a cylinder surrounding the plunger with upper and lower side ports connected to the fuel supply chamber, and a plunger-rotating rack having a range of movement transversely of the plunger between a minimum pump delivery rate position and a maximum rate position; said ports being located such that during the plunger-pumping stroke the groove sequentially moves out of registry with the upper port to initiate fuel injection and into registry with the lower port to end injection; said groove having its upper port-controlling edge inclined whereby movement of the rack in one direction results in relatively earlier closing of the upper port for increased fuel delivery during the plunger-pumping stroke, and movement of the rack in the opposite direction results in relatively later closing of the upper port for decreased fuel delivery; the inclination of said upper port-controlling edge being relatively greater for the circumferentially extending portion thereof traversed by said upper port when the rack is within the relatively lower fuel delivery portion of its range of movement, than the inclination of that portion of said upper port-controlling edge traversed by said upper port when the rack is within the relatively higher fuel delivery portion of its range of movement; said governor comprising engine speed-sensing means, a member movable by said means in response to increasing engine speed, and a spring yieldingly opposing increasing engine speed movements of said member above a predetermined speed approximately midrange between the engine-idling speed and said maximum desired speed; said rack being actuatable by said member in the fuel-decreasing direction in response to movement of said member by said engine speed-sensing means; said spring having sufficient stiffness to prevent movement of said member by said sensing means in response to increasing engine speed up to said predetermined speed, and a load-deflection rate accommodating sufficient movement of said member by said sensing means to actuate the rack to its minimum pump delivery rate position at said maximum desired speed.

Claim 5

In the combination of a plunger-type fuel injector pump and a speed-limiting governor for a compression ignition engine having an idling speed and a maximum desired speed; the pump having a fuel supply chamber, a plunger having a circumferentially extending metering groove spaced from one end thereof and a passage connecting said end to the groove, a cylinder surrounding the plunger with upper and lower side ports connected to the fuel supply chamber, and a plunger-rotating rack having a range of movement transversely of the plunger between a minimum pump delivery rate position and a maximum rate position; said ports being located such that during the plunger-pumping stroke the groove sequentially moves out of registry with the upper port to initiate fuel injection and into registry with the lower port to end injection; said groove having its upper port-controlling edge inclined whereby movement of the rack in one direction results in relatively earlier closing of the upper port for increased fuel delivery during the plunger-pumping stroke, and movement of the rack in the opposite direction results in relatively later closing of the upper port for decreased fuel delivery; the inclination of said upper port-controlling edge being relatively greater for the circumferentially extending portion thereof traversed by said upper port when the rack is within the relatively lower fuel delivery portion of its range of movement, than the inclination of that portion of said upper port-controlling edge traversed by said upper port when the rack is within the relatively higher fuel delivery portion of its range of movement; said governor comprising engine speed-sensing means, a member movable by said means in response to increasing engine speed, and a spring yieldingly opposing increasing engine speed movements of said member above a predetermined speed approximately midrange between the engine-idling speed and said maximum desired speed; said rack being actuatable by said member in the fuel-decreasing direction in response to movement of said member by said engine speed-sensing means; said spring having sufficient stiffness to prevent movement of said member by said sensing means in response to increasing engine speed up to said predetermined speed, and a load-deflection rate accommodating sufficient movement of said member by said sensing means to actuate the rack to its minimum pump delivery rate position at said maximum desired speed.

Claim 6

In the combination of a plunger-type fuel injector pump and a speed-limiting governor for a compression ignition engine having an idling speed and a maximum desired speed; the pump having a fuel supply chamber, a plunger having a circumferentially extending metering groove spaced from one end thereof and a passage connecting said end to the groove; a cylinder surrounding the plunger with upper and lower side ports connected to the fuel supply chamber, and a plunger-rotating rack having a range of movement transversely of the plunger between a minimum pump delivery position and a maximum rate position; said ports being located such that during the plunger pumping stroke the groove sequentially moves out of registry with the upper port to initiate fuel injection and into registry with the lower port to end injection; said groove having its lower port-controlling edge inclined whereby movement of the rack in one direction results in relatively later opening of the lower port for increased fuel delivery during the plunger-pumping stroke, and movement of the rack in the opposite direction results in relatively earlier opening of the lower port for decreased fuel delivery; the inclination of said lower port-controlling edge being relatively greater for the circumferentially extending portion thereof traversed by said lower port when the rack is within the relatively lower fuel delivery portion of its range of movement, than the inclination of that portion of said lower port-controlling edge traversed by said lower port when the rack is within the relatively higher fuel delivery portion of its range of movement; said governor comprising engine speed-sensing means, a member movable by said means in response to increasing engine speed, and a spring yieldingly opposing increasing engine speed movements of said member above a predetermined speed approximately midrange between the engine-idling speed and said maximum desired speed; said rack being actuatable by said member in the fuel-decreasing direction in response to movement of said member by said engine speed-sensing means; said spring having sufficient stiffness to prevent movement of said member by said sensing means in response to increasing engine speed up to said predetermined speed, and a load-deflection rate accommodating sufficient movement of said member by said sensing means to actuate the rack to its minimum pump delivery rate position at said maximum desired speed.

Claim 7

In the combination of a plunger-type fuel injector pump and a speed-limiting governor for a compression ignition engine having an idling speed and a maximum desired speed; the pump having a fuel supply chamber, a plunger having a circumferentially extending metering groove spaced from one end thereof and a passage connecting said end to the groove; a cylinder surrounding the plunger with upper and lower side ports connected to the fuel supply chamber, and a plunger-rotating rack having a range of movement transversely of the plunger between a minimum pump delivery position and a maximum rate position; said ports being located such that during the plunger pumping stroke the groove sequentially moves out of registry with the upper port to initiate fuel injection and into registry with the lower port to end injection; said groove having its lower port-controlling edge inclined whereby movement of the rack in one direction results in relatively later opening of the lower port for increased fuel delivery during the plunger-pumping stroke, and movement of the rack in the opposite direction results in relatively earlier opening of the lower port for decreased fuel delivery; the inclination of said lower port-controlling edge being relatively greater for the circumferentially extending portion thereof traversed by said lower port when the rack is within the relatively lower fuel delivery portion of its range of movement, than the inclination of that portion of said lower port-controlling edge traversed by said lower port when the rack is within the relatively higher fuel delivery portion of its range of movement; said governor comprising engine speed-sensing means, a member movable by said means in response to increasing engine speed, and a spring yieldingly opposing increasing engine speed movements of said member above a predetermined speed approximately midrange between the engine-idling speed and said maximum desired speed; said rack being actuatable by said member in the fuel-decreasing direction in response to movement of said member by said engine speed-sensing means; said spring having sufficient stiffness to prevent movement of said member by said sensing means in response to increasing engine speed up to said predetermined speed, and a load-deflection rate accommodating sufficient movement of said member by said sensing means to actuate the rack to its minimum pump delivery rate position at said maximum desired speed.

Claim 8

In the combination of a plunger-type fuel injector pump and a speed-limiting governor for a compression ignition engine having an idling speed and a maximum desired speed; the pump having a fuel supply chamber, a plunger having a circumferentially extending metering groove spaced from one end thereof and a passage connecting said end to the groove, a cylinder surrounding the plunger with upper and lower side ports connected to the fuel supply chamber, and a plunger-rotating rack having a range of movement transversely of the plunger between a minimum pump delivery rate position and a maximum rate position; said ports being located such that during the plunger pumping stroke the groove sequentially moves out of registry with the upper port to initiate fuel injection and into registry with the lower port to end injection; said groove having its upper and lower port-controlling edges oppositely inclined whereby movement of the rack in one direction results in both relatively earlier closing of the upper port and relatively later opening of the lower port for increased fuel delivery during the plunger-pumping stroke, and movement of the rack in the opposite direction results in relatively later closing of the upper port and relatively earlier opening of the lower port for decreased fuel delivery; the inclinations of said control edges being relatively greater for those circumferentially extending portions of each thereof traversed by said ports when the rack is within the relatively lower fuel delivery portion of its range of movement, than the inclinations of those portions of said control edges traversed by the ports when the rack is within the relatively higher fuel delivery portion of its range of movement; said governor comprising engine speed-sensing means, a member movable by said means in response to increasing engine speed, and a spring yieldingly opposing increasing engine speed movements of said member above a predetermined speed approximately midrange between the engine-idling speed and said maximum desired speed; said rack being actuatable by said member in the fuel-decreasing direction in response to movement of said member by said engine speed-sensing means; said spring having sufficient stiffness to prevent movement of said member by said sensing means in response to increasing engine speed up to said predetermined speed and a load-deflection rate accommodating sufficient movement of said member by said sensing means to actuate the rack to its minimum pump delivery rate position at said maximum desired speed.

Claim 9

In the combination of a plunger-type fuel injector pump and a speed-limiting governor for a compression ignition engine having an idling speed and a maximum desired speed; the pump having a fuel supply chamber, a plunger having a circumferentially extending metering groove spaced from one end thereof and a passage connecting said end to the groove, a cylinder surrounding the plunger with upper and lower side ports connected to the fuel supply chamber, and a plunger-rotating rack having a range of movement transversely of the plunger between a minimum pump delivery rate position and a maximum rate position; said ports being located such that during the plunger pumping stroke the groove sequentially moves out of registry with the upper port to initiate fuel injection and into registry with the lower port to end injection; said groove having its upper and lower port-controlling edges oppositely inclined whereby movement of the rack in one direction results in both relatively earlier closing of the upper port and relatively later opening of the lower port for increased fuel delivery during the plunger-pumping stroke, and movement of the rack in the opposite direction results in relatively later closing of the upper port and relatively earlier opening of the lower port for decreased fuel delivery; the inclinations of said control edges being relatively greater for those circumferentially extending portions of each thereof traversed by said ports when the rack is within the relatively lower fuel delivery portion of its range of movement, than the inclinations of those portions of said control edges traversed by the ports when the rack is within the relatively higher fuel delivery portion of its range of movement; said governor comprising engine speed-sensing means, a member movable by said means in response to increasing engine speed, and a spring yieldingly opposing increasing engine speed movements of said member above a predetermined speed approximately midrange between the engine-idling speed and said maximum desired speed; said rack being actuatable by said member in the fuel-decreasing direction in response to movement of said member by said engine speed-sensing means; said spring having sufficient stiffness to prevent movement of said member by said sensing means in response to increasing engine speed up to said predetermined speed and a load-deflection rate accommodating sufficient movement of said member by said sensing means to actuate the rack to its minimum pump delivery rate position at said maximum desired speed.

Claim 10

The invention of claim 5, wherein said oppositely inclined portions of said upper and lower port control edges traversed by said ports when the rack is within said relatively lower fuel portion of its range of movement are symmetrical with each other in their relation to said ports, and said oppositely inclined portions thereof traversed by said ports when the rack is within said relatively higher fuel delivery portion of its range of movement are likewise symmetrical with each other in their relation to said ports.