| 摘要 |
PROBLEM TO BE SOLVED: To keep a crank case compact and maintain facility of manufacture and assembly by forming an oil passage crossing the crank case in a crank case axial direction by effectively using a dead space in the crank case. SOLUTION: In the oil feeding pathway for an four cycle engine forcibly feeding oil to each lubrication part in the engine, an oil passage pipe 110 crossing inside of the crank case 2 roughly in parallel with a crank shaft O1 axial direction is provided in an area of a bore 6 of a cylinder in a view of a cylinder center direction and enclosed by a locus of a connecting rod 11, a locus of crank web 17 and a skirt rear end part 8a at a bottom dead-center in a view of a direction of the crank shaft axis O1. An oil injection port 112 opening toward a lower surface of a top wall of a piston 8 is formed in a middle of the oil passage pipe 110. The number of the injection ports may be one or plural. COPYRIGHT: (C)2004,JPO
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