FUEL PUMP DRIVING STRUCTURE AND INTERNAL COMBUSTION ENGINE

摘要

The fuel pump driving structure includes a camshaft (3, 103) and a pump cam member (6, 106). The camshaft (3, 103) is arranged to be rotatably supported at one end by a cylinder head (1). The pump cam member (6, 106) has a fitting hole (6a, 107b) into which the one end of the camshaft (3, 103) is press fitted, and arranged to be operatively coupled to a high-pressure fuel pump (5). The pump cam member (6, 106) includes a pump cam section (8, 108) and a first contact section (6b, 107c). The pump cam section (8, 108) has a first lift portion (8a, 108a) arranged to operate the high-pressure fuel pump (5), and a base circular portion (8b, 108b) that does not operate the high-pressure fuel pump (5). The first contact section (6b, 107c) is arranged in a position offset from a position of the first lift portion (8a, 108a) with respect to a circumferential direction and contacting a portion of the camshaft (3, 103) in an axial direction at a position radially outward of an external circumferential surface of the one end of the camshaft (3, 103).