Patent ID: 7487759
Filing Date: 2009-02-10
Classification: F02M,Y10T

Abstract:
1. A flow damper for controlling a flow of fuel flowing from a rail main body that accumulates pressure of high-pressure fuel into an injector that injects fuel, the flow damper comprising: a valve body that is fastened to the rail main body and has a fuel passage therein, wherein: a piston that is slidably held on an inner circumferential surface of the piston sliding hole; a spring that urges the piston in an opposite direction from a direction of fuel flowing through the fuel passage; and a cap that includes a small diameter portion and a large diameter portion, wherein: the small diameter portion is fitted into the inner circumferential surface of the piston sliding hole with a gap between the small diameter portion and the piston sliding hole; the large diameter portion is located between the valve body and the rail main body; and length of the small diameter portion in its axial direction is set such that a direct sliding range, in which the piston directly slides on the inner circumferential surface of the piston sliding hole of the valve body, does not overlap with a screwed range, in which the valve body is screwed into the rail main body, in an axial direction of the valve body.