| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a weld so as to improve appearance, goods value and durability by providing a case body with a cutout part reaching the outer edge of a case from a part of an insert hole of a crankshaft or the like provided at the center of a front gear covering part. SOLUTION: The surface of a closing member 1B fittingly fixed to the surface side of closing member fitting recessed parts 15, 15 formed by slightly recessing the both upper and lower side surfaces of a cutout part 3 provided in L-shape from the rear side of an insert hole 10 of a case body 1A to the outer edge of a case so as to communicate, compared to the other part is formed to be flush with the surface of a gear covering part 6 of the case body 1A. Accordingly, when a hot resin solution is filled in a cavity from a hot resin solution filling port that can be provided near the cutout part 3 provided with a larger width than the cross-sectional dimensions of a crankshaft, or near the rear end part of a chain covering part 9, the hot solution flows in one direction so as to have no opposed collision. Formation of a weld can therefore be eliminated.
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