A high-pressure fuel pump for an internal combustion engine. The high-pressure fuel pump includes an improved configuration that beneficially simplifies certain features of the high-pressure fuel pump. The fuel pump possesses an inlet check valve positioned along an inlet fuel circuit and an outlet
A high-pressure fuel pump for an internal combustion engine. The high-pressure fuel pump includes an improved configuration that beneficially simplifies certain features of the high-pressure fuel pump. The fuel pump possesses an inlet check valve positioned along an inlet fuel circuit and an outlet fuel circuit of the high-pressure pump that provides a path for a low-pressure inlet fuel flow to and a path for a high-pressure output fuel flow from a pumping chamber of the fuel pump. Because of the configuration of the inlet check valve and the outlet check valve, the complexity of high-pressure fuel pump is beneficially reduced, decreasing the cost of components and assembly and improving the life and reliability of high-pressure fuel pump.
대표청구항▼
1. A fuel pump for an internal combustion engine, comprising: a pump housing; anda pumping unit mounted in the pump housing and including a pumping barrel having a longitudinal axis,a barrel bore extending along the longitudinal axis,a pumping plunger positioned within the barrel bore to form a pump
1. A fuel pump for an internal combustion engine, comprising: a pump housing; anda pumping unit mounted in the pump housing and including a pumping barrel having a longitudinal axis,a barrel bore extending along the longitudinal axis,a pumping plunger positioned within the barrel bore to form a pumping chamber, the pumping plunger mounted for reciprocal movement through an intake stroke to receive fuel in the pumping chamber and a pressure stroke to pump fuel under high pressure from the pumping chamber,an inlet check valve cavity in fluid communication with the pumping chamber, andan inlet check valve positioned in the inlet check valve cavity, the inlet check valve including an inlet check valve plunger mounted for movement in the inlet check valve cavity away from the pumping chamber during the pumping plunger intake stroke, the inlet check valve cavity being positioned to receive an inlet flow of fuel for delivery to the pumping chamber during the pumping plunger intake stroke and positioned to receive high-pressure fuel from the pumping chamber during the pumping plunger pressure stroke;wherein the inlet check valve plunger includes a passage extending into the inlet check valve plunger at an angle relative to the longitudinal axis to receive the high pressure fuel from the pumping chamber during the pumping plunger pressure stroke. 2. The fuel pump of claim 1, wherein the inlet check valve cavity is positioned to receive high-pressure fuel at one end and to discharge high pressure fuel at an opposite end. 3. The fuel pump of claim 1, wherein the inlet check valve plunger is mounted to move along an axis positioned in coaxial alignment with the longitudinal axis of the barrel bore. 4. The fuel pump of claim 3, the pumping unit further including an outlet check valve plunger mounted to move along an axis positioned in coaxial alignment with the longitudinal axis of the barrel bore. 5. The fuel pump of claim 1, wherein the inlet check valve plunger moves along a reciprocation axis, and further including an outlet check valve plunger mounted to move along an axis positioned in coaxial alignment with the reciprocation axis. 6. The fuel pump of claim 1, wherein the inlet check valve further includes a bias spring mounted in the inlet check valve cavity a spaced distance from a flow path of high-pressure fuel flowing through the inlet check valve cavity. 7. The fuel pump of claim 6, further including a bias spring cavity to receive the bias spring, the inlet check valve plunger being sized and positioned to block fuel flow into the bias spring cavity. 8. The fuel pump of claim 1, the pumping unit further including an outlet fitting and the inlet check valve cavity is positioned within the outlet fitting. 9. The fuel pump of claim 1, the pumping unit further including an outlet check valve and an outlet fitting secured to the pumping barrel, and the inlet check valve and the outlet check valve are positioned in the outlet fitting. 10. The fuel pump of claim 9, the inlet check valve including a longitudinal axis and the outlet check valve including a longitudinal axis, and inlet check valve axis is coaxial with the outlet check valve axis. 11. The fuel pump of claim 1, wherein the passage extends into a side wall of the inlet check valve plunger and is spaced apart from a proximate end of the inlet check valve plunger adjacent the pumping chamber. 12. A pumping unit for a fuel pump of an internal combustion engine, comprising: a pumping plunger positioned in a bore extending along a longitudinal axis of the pumping unit to form a pumping chamber, the pumping plunger mounted for reciprocal movement through an intake stroke to receive fuel in the pumping chamber and a pressure stroke to pump fuel from the pumping chamber;an inlet check valve cavity; andan inlet check valve positioned in the inlet check valve cavity, the inlet check valve including an inlet check valve plunger mounted for movement in the inlet check valve cavity away from the pumping chamber during the pumping plunger intake stroke, the inlet check valve cavity being positioned to receive an inlet flow of fuel for delivery to the pumping chamber during the pumping plunger intake stroke and positioned to receive a flow of high-pressure fuel from the pumping chamber during the pumping plunger pressure stroke; anda bias spring mounted in the inlet check valve cavity;wherein an end of the inlet check valve plunger extends through the bias spring. 13. The pumping unit of claim 12, further including an outlet fitting and the inlet check valve cavity is positioned within the outlet fitting. 14. The pumping unit of claim 13, the outlet fitting further including an outlet check valve cavity having a longitudinal axis, the inlet check valve cavity positioned in a proximate end of the outlet fitting and the outlet check valve cavity positioned in a distal end of the outlet fitting. 15. The pumping unit of claim 14, the inlet check valve cavity having a longitudinal axis and the outlet check valve cavity longitudinal axis is coaxial with the inlet check valve cavity longitudinal axis. 16. The pumping unit of claim 14, the inlet check valve cavity having a longitudinal axis and at least two of the inlet check valve cavity longitudinal axis, the pumping unit longitudinal axis, and the outlet check valve cavity longitudinal axis are coaxial. 17. The fuel pump of claim 12, further including an outlet fitting and an outlet check valve, and the inlet check valve and the outlet check valve are positioned within the outlet fitting. 18. A fuel pump for an internal combustion engine, comprising: a bore extending along a longitudinal axis;a pumping plunger positioned in the bore to form a pumping chamber;a high-pressure fuel outlet;an inlet fuel circuit connected to the pumping chamber to provide an inlet flow of fuel to the pumping chamber;an outlet fuel circuit connecting the pumping chamber to the high pressure fuel outlet to provide an outlet flow of high-pressure fuel from the pumping chamber;an outlet check valve positioned along the outlet fuel circuit downstream from the pumping chamber and upstream from the high-pressure fuel outlet; andan inlet check valve positioned along the inlet fuel circuit upstream from the pumping chamber to receive fuel for delivery to the pumping chamber during the pumping plunger intake stroke and positioned along the outlet fuel circuit upstream from the outlet check valve and downstream from the pumping chamber to receive high-pressure fuel from the pumping chamber during the pumping plunger pressure stroke;wherein the inlet check valve includes an inlet check valve plunger mounted for movement away from the pumping chamber during the pumping plunger intake stroke; andwherein the inlet check valve plunger includes a passage extending into the inlet check valve plunger at an angle relative to the longitudinal axis to receive the high pressure fuel from the pumping chamber during the pumping plunger pressure stroke. 19. The fuel pump of claim 18, further including an outlet fitting and the inlet check valve and the outlet check valve are positioned within the outlet fitting. 20. The fuel pump of claim 19, the outlet fitting further including an inlet check valve cavity having a first longitudinal axis and an outlet check valve cavity having a second longitudinal axis and the first longitudinal axis and the second longitudinal axis are coaxial. 21. The fuel pump of claim 20, wherein the inlet check valve further includes a bias spring mounted in the inlet check valve cavity a spaced distance from a flow path of high-pressure fuel flowing through the inlet check valve cavity. 22. The fuel pump of claim 21, further including a bias spring cavity to receive the bias spring, the inlet check valve being sized and positioned to block fuel flow into the bias spring cavity. 23. The fuel pump of claim 18, wherein the passage extends into a side wall of the inlet check valve plunger and is spaced apart from a proximate end of the inlet check valve plunger adjacent the pumping chamber.
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