초록 ▼

The pump described herein provides a potentially lower cost alternative to conventional high-pressure pumps by providing a head, a plunger, and a control valve assembly. The head defines a valve bore having a first diameter, a plunger bore having a second diameter, and an intermediate chamber having

The pump described herein provides a potentially lower cost alternative to conventional high-pressure pumps by providing a head, a plunger, and a control valve assembly. The head defines a valve bore having a first diameter, a plunger bore having a second diameter, and an intermediate chamber having a third diameter. The plunger is configured to reciprocate within the plunger bore. The plunger, the plunger bore, and the intermediate chamber at least partially define a pumping chamber. The control valve assembly is coupled to the head and includes an actuator moveable in response to an input signal and a valve element coupled to the actuator. The valve element is received within the valve bore and moveable between an open and a closed position. The valve element includes a body having a fourth diameter and a valve head having a fifth diameter. The first diameter is no larger than the second diameter.

대표청구항 ▼

What is claimed is: 1. A pump comprising: a housing; a driven member coupled to the housing; a head coupled to the housing and defining a valve bore having a first diameter, a plunger bore having a second diameter, and an intermediate chamber having a third diameter, the intermediate chamber being

What is claimed is: 1. A pump comprising: a housing; a driven member coupled to the housing; a head coupled to the housing and defining a valve bore having a first diameter, a plunger bore having a second diameter, and an intermediate chamber having a third diameter, the intermediate chamber being located between the valve bore and the plunger bore; a plunger configured to reciprocate within the plunger bore, the plunger, the plunger bore, and the intermediate chamber at least partially defining a pumping chamber; and a control valve assembly coupled to the head, the control valve assembly including an actuator moveable in response to an input signal and a valve element coupled to the actuator, the valve element being received within the valve bore and being moveable between an open position and a closed position and including a body having a fourth diameter and a valve head having a fifth diameter; wherein the first diameter is no greater than the second diameter. 2. The pump of claim 1, wherein the fifth diameter is no greater than the second diameter. 3. The pump of claim 2, wherein the fifth diameter is greater than the first diameter. 4. The pump of claim 1, wherein the valve element includes a stem between the valve head and the body, the stem having a sixth diameter less than the fourth diameter and the fifth diameter. 5. The pump of claim 1, wherein the first diameter is smaller than the second diameter. 6. The pump of claim 1, wherein the valve head includes a first sealing surface and the head includes a second sealing surface, the first sealing surface cooperating with the second sealing surface to form a sealed interface when the valve element is in the closed position. 7. The pump of claim 6 wherein the head defines a fuel inlet passage and wherein when the valve element is in the closed position, the sealed interface is engaged and the pumping chamber is fluidly disconnected with the fuel inlet passage, and when the valve element is in the open position, the sealed interface is disengaged and the pumping chamber is fluidly connected with the fuel inlet passage. 8. The pump of claim 7, wherein the movement of the actuator causes the valve element to move between the open position and the closed position. 9. The pump of claim 8, wherein the actuator is selectively actuatable to control fluid communication between the fuel inlet passage and the pumping chamber. 10. The pump of claim 1, wherein the valve bore of the head receives the body of the valve element. 11. The pump of claim 1, wherein the head is integrally formed as a single unitary body. 12. The pump of claim 1, wherein the valve bore, the plunger bore, and the intermediate chamber sharing a common axis. 13. The pump of claim 1, wherein the plunger is coupled to the driven member and configured to reciprocate within the plunger bore in response to the movement of the driven member. 14. A pump comprising: a housing; a driven member coupled to the housing; a head coupled to the housing and defining a first sealing surface, a valve bore having a first diameter, a plunger bore having a second diameter, and an intermediate chamber having a third diameter, the intermediate chamber being located between the valve bore and the plunger bore; a plunger configured to reciprocate within the plunger bore, the plunger, the plunger bore, and the intermediate chamber at least partially defining a pumping chamber; and a control valve assembly coupled to the head, the control valve assembly including an actuator moveable in response to an input signal and a valve element coupled to the actuator, the valve element being received within the valve bore and being moveable between an open position and a closed position and including a body having a fourth diameter and a valve head having a fifth diameter, the valve head including a second sealing surface; wherein when the valve element is in the closed position, the first sealing surface and the second sealing surface cooperate to form a sealed interface. 15. The pump of claim 14, wherein the first sealing surface defines a portion of the intermediate chamber. 16. The pump of claim 14 wherein the first diameter is no greater than the second diameter. 17. The pump of claim 14, wherein the head defines a fuel inlet passage and wherein when the valve element is in the closed position the pumping chamber is fluidly disconnected with the fuel inlet passage and when the valve element is in the open position the pumping chamber is fluidly connected with the fuel inlet passage. 18. The pump of claim 14, wherein the head is integrally formed as a single unitary body. 19. The pump of claim 14, wherein the fifth diameter is no greater than the second diameter. 20. The pump of claim 19, wherein the fifth diameter is greater than the first diameter. 21. A method of assembling a pump comprising the steps of: providing a head having a valve bore, a plunger bore, and an intermediate chamber between the valve bore and the plunger bore; providing a valve element including a body and a valve head; installing the valve element within the head by sliding the body of the valve element into the plunger bore, then into the intermediate chamber, and then into the valve bore so that when the valve element is installed the valve body is received within the valve bore and the head of the valve element is received within the intermediate chamber. 22. The method of claim 21, wherein the step of providing a head further comprises the step of providing a head with a valve bore having a first diameter and a plunger bore having a second diameter, the first diameter being no greater than the second diameter. 23. The method of claim 22, wherein the step of providing a valve element further comprises the step of providing a valve element with a valve head having a third diameter, the third diameter being greater than the first diameter. 24. The method of claim 21, wherein the step of providing a head further comprises the step of providing a head with a first sealing surface, and wherein the step of providing a valve element further comprises the step of providing a valve element with a second sealing surface, the first sealing surface and the second sealing surface being configured to cooperate to form a sealed interface.