| 摘要 |
Driving worm provided on a transmission shaft, driven worm wheel provided on a cultivating shaft, main shaft portion of the transmission shaft and clutch are collectively accommodated in a transmission casing, which includes first and second bearings for preventing the clutch and driving gear from being displaced toward each other. The main shaft portion is screw-coupled to the clutch and a direction in which the screw-coupling between the main shaft portion and the clutch is tightened corresponds to only one rotational direction of an engine. The casing has a single opening for inserting therein the worm and worm wheel, and the opening is closed with a lid that also functions to prevent the worm from coming off the casing.
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