High-Pressure Fuel Pump for an Internal Combustion Engine

摘要

A high pressure fuel pump for an internal combustion engine with direct fuel injection includes a pump housing, a pressure damper, and a pressure regulating valve. The pressure damper is connected to a pump inlet in a low pressure region via a first bore in the housing, and to a pump outlet in a high pressure region via a second bore in the housing. The pressure regulating valve has a limit pressure, is disposed in the second bore, is configured to open in response to a pressure in the high pressure region being greater than the limit pressure, and is configured to close in response to the pressure in the high pressure region being less than the limit pressure, such that pressure in the high-pressure region is regulated toward a constant value of the limit pressure.

主权项

1. A high pressure fuel pump for an internal combustion engine with direct fuel injection, comprising:
a pump housing that defines:
an inlet stub in an inlet-side low-pressure region;an outlet stub in an outlet-side high-pressure region; anda pump working space configured to receive a pump piston along a longitudinal axis of the pump; a cover fixedly connected to the pump housing; a pressure damper that is disposed in the low-pressure region and that defines a receiving space such that the receiving space is located below the cover, the receiving space connected to the inlet stub via a first bore in the pump housing that is parallel to and eccentric with respect to the longitudinal axis; an inlet valve that is configured to connect the pump working space with the receiving space; and a mechanical pressure regulating valve disposed in a second bore in the pump housing that is eccentric with and parallel to the longitudinal axis,
the pressure regulating valve having a limit pressure, and defining:
an inlet connected to the high-pressure region via the outlet stub; andan outlet connected to the receiving space, andthe pressure regulating valve configured to open in response to a pressure in the high pressure region being greater than the limit pressure, and configured to close in response to the pressure in the high pressure region being less than the limit pressure, such that the pressure regulating valve is configured to regulate the pressure in the high-pressure region toward a constant value of the limit pressure.