Patent ID: 6109230
Filing Date: 2000-08-29
Classification: F01L

Abstract:
A decompression device for an engine having a crankshaft rotated by a recoil starter, a gear securely mounted on said crankshaft, a camshaft synchronously rotated by said crankshaft, a cam gear supported on said camshaft and meshed with said gear, and a push rod mechanically lifted for opening and closing a valve, the decompression device comprising:a cam portion formed integrally on a periphery of said cam gear including an intake cam and an exhaust cam, a decompression element slidably and rotatable inserted in a hole of said cam portion in parallel with said crankshaft;a decompression cam exposed from a groove with a semicircular section provided in said hole;an annular groove provided at one of sides of said cam gear;a weight provided in said annular groove and at an end of said decompression element; anda spring provided in the annular groove for urging said weight to said camshaft in hand-starting operation and moved apart from the camshaft by centrifugal force, thereby projecting said decompression cam in a compression stroke of the engine so as to open said valve.