| 摘要 |
PROBLEM TO BE SOLVED: To improve the strength of a frame and facilitate tightening of a cover by offsetting a clutch cover tightening part nearer to an engine or the center of a clutch cover than the external circumferential profile of the clutch cover near proximity parts of the clutch cover and the main frame. SOLUTION: The lower end 1a of a main frame 1 is close to a clutch cover 11, and a tightening bolt hole 11a of the clutch cover 11 in the vicinity of a proximity part 1b of the clutch cover 11 and the lower end 1a of the main frame 1 is offset closer to an engine or the center of the clutch cover 11 (for example, to the fitting position of a main shaft 7) than the external circumferential profile 13 of the clutch cover 11. Therefore, in tightening the clutch cover 11, the bolt can be tightened without any interference by the frame 1, thus improving workability and maintainability. It is also possible to determine the shape of the frame 1 without considering some matters such as fitting a notch, thus providing the frame 1 with excellent strength and rigidity.
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