Patent ID: 6543476
Filing Date: 2003-04-08
Classification: F01M,F04B,F16N,Y10T

Abstract:
A relief valve for regulating discharged oil pressure of an oil pump at a predetermined level, comprising:a housing including a bore therein, and a pair of relief grooves formed in the housing so as to extend along a plane passing an axial center of the bore while separating from the plane with a predetermined space, each of said relief grooves has a respective opening to an inner peripheral portion of the bore; a valve body disposed in the housing so as to be slidably moved in the bore in response to the discharged oil pressure supplied into the bore at one side of the valve body; a spring provided in the other side of the valve body constantly urging the valve body toward the one side of the valve body so as to close the openings of the relief grooves by the valve body; and adjusting means for adjusting a change rate of an opening area of the relief grooves which open relatively to the slide movement of the valve body against the urging force of the spring so that the change rate at the beginning of one slide movement of the valve body is smaller than that at the end of the slide movement of the valve body.