Patent ID: 6817331
Filing Date: 2004-11-16
Classification: F01L,F02B

Abstract:
An internal combustion engine comprising: a crankshaft; a camshaft driven for rotation in synchronism with the crankshaft; an engine valve controlled for opening and closing by a valve-operating cam; and a decompressing mechanism for opening the engine valve during a compression stroke in a starting phase;wherein the decompressing mechanism includes: a pin supported so as to be turnable on the camshaft; a flyweight supported for turning relative to the camshaft by the pin on the camshaft; and a decompression cam operating together with the flyweight to apply valve opening force to the engine valve; the pin is inserted in holes formed in the flyweight so as to be turnable; and a restraint is provided to restrain the pin and the flyweight from movement relative to each other, wherein the restraint restrains the pin and the flyweight from movement relative to each other in directions parallel to an axis of turning of the flyweight, and wherein the restraint is an elastic member placed between the pin and the flyweight and applying resilient force to the pin and the flyweight.