A pump has a housing defining a first pumping chamber and a second pumping chamber. The pump also has a first plunger and a second plunger. The pump additionally has at least one driver operatively engaged with at least one of the first and second plungers to move the at least one of the first and
A pump has a housing defining a first pumping chamber and a second pumping chamber. The pump also has a first plunger and a second plunger. The pump additionally has at least one driver operatively engaged with at least one of the first and second plungers to move the at least one of the first and second plungers between first and second end positions. The pump further has a common spill passageway fluidly connectable to the first and second pumping chambers and a selector valve disposed between the common spill passageway and the first and second pumping chambers. The selector valve has a body and a ball valve member operably disposed within the body. The ball valve member is movable between a first and a second ball valve member position to selectively fluidly connect the first and second pumping chambers to the common spill passageway.
대표청구항▼
What is claimed is: 1. A pump comprising: a pump housing including; a first pumping chamber, a second pumping chamber substantially parallel to the first pumping chamber, a substantially cylindrical bore, located between the first and the second pumping chamber, extending from an outside surface of
What is claimed is: 1. A pump comprising: a pump housing including; a first pumping chamber, a second pumping chamber substantially parallel to the first pumping chamber, a substantially cylindrical bore, located between the first and the second pumping chamber, extending from an outside surface of the housing into the housing, the bore being substantially parallel to the first and the second pumping chamber and having a curved side wall and an end face; a first fluid passageway coupling the first pumping chamber with the bore, the first fluid passageway intersecting the curved sidewall of the bore; a second fluid passageway coupling the second pumping chamber to the bore, the second fluid passageway intersecting the curved sidewall of the bore; a common spill passageway extending coaxially from the end face of the bore into the housing; and a substantially cylindrical selector valve fixedly coupled to the bore, the selector valve including; a curved external surface forming a mating surface with the curved surface of the bore, a through fluid passageway extending from one side of the curved external surface to an opposite side of the curved external surface, the through fluid passageway coupling the first and second fluid passageway and being substantially coaxial with the first and second fluid passageway; a third fluid passageway coupling the through fluid passageway to the common spill passageway, the third fluid passageway being substantially perpendicular to the through fluid passageway; and a ball valve member disposed in the through fluid passageway, the ball valve member being movable between a first and a second ball valve position to selectively couple one of the first and second fluid passageways to the common spill passageway. 2. The pump of claim 1, wherein the third fluid passageway includes a first section proximate the ball valve member and a second section proximate the end face of the bore, the second section having a larger diameter than the first section. 3. The pump of claim 2, further including a spill control valve extending from the common spill passageway and configured to move in the second section from a first spill control valve position to a second spill control valve position, the first spill control valve position being a position where the third fluid passageway is fluidly coupled with the common spill passageway and the second spill control valve position being a position where the spill control valve mates with the end face of the bore and fluidly decouples the third fluid passageway and the common spill passageway. 4. The pump of claim 1, wherein the selector valve further includes: a first valve seat; and a second valve seat, the ball valve member being disposed between the first and second valve seats and configured to selectively engage the first and second valve seats. 5. The pump of claim 4, wherein the first valve seat is a separate part that is attached to the selector valve. 6. The pump of claim 5, wherein the second valve seat is integral with the selector valve. 7. The pump of claim 5, wherein the first valve seat is attached to the selector valve by one of pressing, threaded fastening, welding and chemical bonding. 8. The pump of claim 4, wherein the first valve seat has at least one point of contact with the housing. 9. The pump of claim 1, further including a high-pressure outlet in fluid communication with the first and second pumping chambers. 10. The pump of claim 1, wherein the selector valve is fixedly coupled to the bore by one of pressing, threaded fastening, welding, or chemical bonding. 11. The pump of claim 1, further including a first plunger slidably disposed within the first pumping chamber and a second plunger slidably disposed within the second pumping chamber, the first plunger and the second plunger configured to assist in pressurizing a fluid. 12. The pump of claim 11, wherein the first plunger is configured to reciprocate out of phase with the second plunger. 13. The pump of claim 11, further including a first driver engaged with the first plunger to reciprocate the first plunger between two end points of the first pumping chamber, and a second driver engaged with the second plunger to reciprocate the second plunger between two end points of the second pumping chamber. 14. The pump of claim 13, wherein the first driver and the second driver are each one of a cam, a solenoid actuator, a piezo actuator, a hydraulic actuator, and a motor. 15. The pump of claim 13, wherein a rotation of the first driver results in a reciprocatory motion of the first plunger, and a rotation of the second driver results in a reciprocatory motion of the second plunger. 16. The pump of claim 1, further including a low pressure gallery in selective fluid communication with the first pumping chamber and the second pumping chamber. 17. The pump of claim 16, further including a first inlet check valve between the first pumping chamber and the low pressure gallery, the first inlet check valve being configured to allow flow of a fluid from the low pressure gallery to the first pumping chamber. 18. The pump of claim 17, further including a second inlet check valve between the second pumping chamber and the low pressure gallery, the second inlet check valve being configured to allow flow of the fluid from the low pressure gallery to the second pumping chamber. 19. The pump of claim 1, further including a high pressure gallery in selective fuel communication with the first pumping chamber and the second pumping chamber. 20. The pump of claim 19, further including a first outlet check valve between the first pumping chamber and the high pressure gallery and a second outlet check valve between the second pumping chamber and the high pressure gallery, the first outlet check valve configured to allow flow of a fluid from the first pumping chamber to the high pressure gallery and the second outlet check valve configured to allow flow of the fluid from the second pumping chamber to the high pressure gallery.
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