Patent ID: 7406954
Filing Date: 2008-08-05
Classification: F02M,Y10T

Abstract:
1. In a high-pressure fuel pump used in the fuel system of automotive vehicles, the pump including an electric motor a drive shaft of which is attached to a pumping element, a fuel inlet passage for low-pressure fuel from a source thereof to be drawn into the pump, a fuel outlet passage through which high-pressure fuel is pumped to an engine of the vehicle, and a check valve assembly installed in the outlet passage comprising: a retainer seated at an outlet end of the outlet passage; a check valve which, when the pump is off, blocks an inlet into the outlet passage to prevent fuel flow through the outlet passage and into the pump, resulting in a decrease in fuel pressure, but, when the pump is operating is forced away from the inlet to open the valve and allow fuel to freely flow through the outlet passage, the fuel flowing both around and through the check valve as it flows through the outlet passage with the flow of fuel around and through the check valve, when the check valve is open, providing for quiet operation of the fuel system so when the pump is operating no discernible noise or chattering is produced by the check valve; and, a spring one end of which seats against the retainer and the other end of which seats against the check valve, the spring being a fully collapsible spring by which, when the check valve is opened it collapses the spring sufficiently that one end of the check valve abuts against the retainer so that the outlet passage is fully opened.