| 摘要 |
PROBLEM TO BE SOLVED: To improve work efficiency in attaching an accessory to a crank case and miniaturize the crank case by inhibiting drop of rigidity of the crank case by an opening provided on a side wall of the crank case. SOLUTION: An internal combustion engine E of a power device P is provided with an oil pump 80 driven and rotated by a transmission mechanism T provided with an endless chain 103, and a crank case 4 provided with an opening 130 formed by projecting walls 112, 122 of side walls 12, 22 of the crank case 4 in an axial direction. A drive sprocket 101 and a drive sprocket 102 are attached to a main shaft 53 of a transmission M and a shaft end part 81a of a drive shaft 81 of the oil pump 80 respectively. The projecting walls 112, 122 and mating surfaces 113, 123 include overlapping parts 122a, 123a overlapping the driven sprocket 102 in a side view, and whole body of the shaft end part 81a and remaining part of the driven sprocket 102 are exposed in the opening 130. COPYRIGHT: (C)2007,JPO&INPIT
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