Patent ID: 7114483

Claim:
A lubrication device for a four-stroke engine, comprising: a crank room ( 1 ) communicating with a space below a piston ( 17 ), a crank ( 13 ) rotatably received in the crank room ( 1 ); a cam room ( 2 ) in which a cam device ( 21 ) and a swing arm unit ( 22 ) are received; an enclosed lubricant room ( 3 ) which is adapted to receive lubrication oil ( 7 ) therein and a suction path assembly ( 4 ) located in the lubricant room ( 3 ), an air inlet ( 451 ) defined in the suction path assembly ( 4 ) and located above a level ( 70 ) of the lubrication oil ( 7 ), a plurality of holes ( 46 ) defined in a wall of the suction path assembly ( 4 ) and at least one of the holes ( 46 ) located beneath the level ( 70 ) of the lubrication oil ( 7 ), and a chamber ( 5 ) respectively communicating with the crank room ( 1 ), the cam room ( 2 ) and the suction path assembly ( 4 ) of the lubricant room ( 3 ), when the piston ( 17 ) moves upward, the chamber ( 5 ) communicating with the crank room ( 1 ) and the suction path assembly ( 4 ) of the lubricant room ( 3 ), when the piston moves downward, the chamber ( 5 ) communicating with the crank room ( 1 ) and the cam room ( 2 ).