Patent ID: 6895918

Claim:
A decompression device of an internal combustion engine, comprising: a push-up member disposed on a circumference of a cam shaft of a valve system of the internal combustion engine, within a range in a circumferential direction corresponding to a compression stage of the engine, wherein the push-up member protrudes outwardly in the radial direction of the cam shaft more than a base face of an exhaust-side cam face formed on the cam shaft, and the push-up member is movably supported in a cam shaft direction; and a drive mechanism for moving the push-up member between a decompression operating position, at which the push-up member is inserted in a width-wise range of a bottom face of an exhaust-side tappet of the valve system, which comes in contact with the exhaust-side cam face and a decompression non-operating position, at which the push-up member is retreated from the width-wise range; wherein the drive mechanism includes: a guide rod fitted into a shaft-center bore formed along a shaft center of the cam shaft so as to be movable in the cam shaft direction; and a connecting member for connecting the guide rod and the push-up member so as to be integrally movable; and wherein the push-up member is moved in the cam shaft direction through the connecting member by moving the guide rod.