Patent ID: 7107967

Claim:
A fuel supply pump that is provided between a fuel tank and a fuel injecting apparatus, the fuel supply pump supplying fuel fed from the fuel tank to the fuel injecting apparatus, the fuel supply pump comprising: a housing that defines a cam chamber such that lubricating oil is supplied from the cam chamber; a camshaft that is rotatably supported in the housing, the camshaft including a cam portion that rotates in the cam chamber; and a cam ring that is rotatably connected with the camshaft, wherein the cam ring has an axial end portion that defines an oil groove communicating the cam chamber with a gap, which is substantially circumferentially defined between the cam portion and the cam ring, so that lubricating oil is capable of flowing from the cam chamber into the gap, which is substantially circumferentially defined between the cam portion and the cam ring, through the oil groove.