Patent ID: 7886707
Filing Date: 2011-02-15
Classification: F01L

Abstract:
1. A decompressor for an internal combustion engine, the decompressor performing decompression and cancelling the decompression by moving a decompression shaft relative to a camshaft to make an emerging-and-submerging decompression portion of the decompression shaft emerge above and submerge below a cam face of a valve-moving cam formed on the outer circumferential surface of the camshaft, the decompression shaft being supported so as to be rotatable freely, and the camshaft being supported by a bearing so as to be rotatable freely and driving an engine valve by use of the valve-moving cam, wherein the decompression shaft is inserted and fitted into an insertion hole of the camshaft so as to be rotatable relative to the camshaft, the insertion hole having an opening in a first end face of the camshaft and drilled in the axial direction of the camshaft at a position eccentric to the rotational axis of the camshaft; a swing portion is provided at a first end of the decompression shaft, and extends along the first end face of the camshaft in a radial direction of the decompression shaft; by engaging a falling-off prevention pin with the decompression shaft while allowing the decompression shaft to rotate, the decompression shaft is prevented from moving in the axial direction of the decompression shaft, the falling-off prevention pin being inserted in a pin insertion hole of the camshaft having an opening to the outer circumferential surface of the camshaft and intersecting, at least partially, the insertion hole; the opening of the pin insertion hole of the camshaft is blocked by the bearing; and the movement of the bearing in the axial direction of the camshaft is restricted by a bearing-restrict portion in the swing portion, the bearing-restrict portion formed so as to protrude towards the bearing.