Patent ID: 6694939
Filing Date: 2004-02-24
Classification: F01L,F02B

Abstract:
An internal combustion engine including an air intake valve and an exhaust valve wherein a rocker arm is pivoted by a cam provided on a cam shaft driven by a crankshaft for opening and closing the air intake valve or the exhaust valve and including a decompression unit comprising:a first decompression cam for assuming an operating position when the number of revolutions of the engine is not more than a predetermined number of revolutions during startup; a decompression arm being supported by the internal combustion engine for a pivotal motion and having a first abutting portion for abutting against the first decompression cam and a pressing portion for pressing the rocker arm; and a resilient member applying a resilient force so that the first abutting portion of the decompression arm is brought into abutment against the first decompression cam; said decompression arm being pivoted by the first decompression cam located at the operating position against the resilient force for allowing the rocker arm to pivot via the pressing portion for opening the air intake valve or the exhaust valve.