(57) [summary] [purpose] so as to gear and thrust liner can be removable only without inconvenience transmission shaft to fall off to improve the assembling property and maintainability. The [configuration] cylindrical gear 13 of the transmission shaft removal state, and Shifutafuoku 11, is constructed in order to support at three points of a pair of transmission gears for simultaneously engaged, further, detachable transmission shaft of the thrust liner 26a, 26b the main case 6, It will be provided to 7 external.
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