| 摘要 |
PROBLEM TO BE SOLVED: To facilitate dimensional control by stabilizing frictional force between the housing side of a clutch mechanism and a friction plate. SOLUTION: When an intermediate shaft 33 is rotated to a housing 38, this clutch mechanism 34 enables power transmission by utilizing the frictional force of a friction plate 61, swinging a clutch key 63 and connecting the intermediate shaft 33 and a second small gear 35 to each other. When the intermediate shaft 33 is stopped, connection of the intermediate shaft 33 to the second small gear 35 by the clutch key 63 is canceled, so that the second small gear 35 can be rotated in two-way. The friction plate 61 is arranged in the inside of the housing 38. The housing 38 and the peripheral surface of the friction plate 61 are sealed by an oil seal 62 which is brought into contact with by force for applying drag to retain the clutch key 63. Lubricating oil J is filled into a space S surrounded by the housing 38, the friction plate 61 and the oil seal 62.
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