| 摘要 |
PROBLEM TO BE SOLVED: To improve durability, to reinforce a base part of a flange part, and to provide a compact constitution. SOLUTION: A pair of thrust bearings 45, 47 are disposed between a rotating shaft receiving engagement reaction force of gear and a casing, while the thrust bearings 45, 47 receive opposite directional force each other. In the thrust bearing 47 disposed in one side where it receives the engagement reaction force, a large rolling element 57 is used according to the engagement reaction force. In the thrust bearing 45 disposed in the other side where it does not receive the engagement reaction force, a small rolling element 53 is used suitably.
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