Fuel pump for an internal combustion engine

摘要

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.

主权项

1. A fuel pump for an internal combustion engine, comprising:
a pump housing; and a 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.