| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an oil a return passage structure in an internal combustion engine for a small vehicle having high degree freedom for arranging an oil return passage and capable of preventing oil from flowing back to the oil return passage from an oil holding chamber. <P>SOLUTION: In the oil return passage structure for returning the oil supplied to a cylinder head part 12 of the internal combustion engine 1 for a small vehicle to the oil holding chamber 14a below crank cases 10, 10A, 10B, the oil return passage 90 is formed in a cylinder part 11 and inclined sidewalls 10Aa, 10Ba of the crank case 10B, a plurality of ribs 80, 81 constituted by hanging down rib top parts 80a, 81a to the oil holding chamber are formed spaced apart from each other around an outlet opening 94 of the oil holding chamber side of the oil return passage. <P>COPYRIGHT: (C)2013,JPO&INPIT |
