Patent ID: 8387595
Filing Date: 2013-03-05
Classification: F01M,F16N

Abstract:
1. A lubricating device for a four-stroke engine that circulates oil while lubricating each part in a valve operating chamber and a crank chamber, the valve operating chamber accommodating an intake valve and an exhaust valve, by supplying the oil to the valve operating chamber and the crank chamber using pressure fluctuation in the crank chamber, the pressure fluctuation being caused by reciprocating motion of a piston, and discharges blowby gas contained in a circulation path through which the oil circulates, from the valve operating chamber to a combustion chamber via a breather passageway connected to the valve operating chamber, wherein: the valve operating chamber is formed by mounting a valve operating chamber cover; and a suction passageway that sucks the oil in the valve operating chamber is provided by forming a groove on an inner surface of the valve operating chamber cover and sealing the groove with a sealing member shaped to fit the groove.