| 摘要 |
To ensure that the situation of fitting a coupler rubber reversely on the front and rear sides would be generated with difficulty, and to ensure that the fitting direction of the coupler rubber can be visually checked even after the fitting. A driving-side coupler 23a provided on the side of an output shaft 21 of an engine 20, a driven-side coupler 23b provided on the side of a drive shaft 22, and a coupler rubber 40 disposed between both the couplers 23a and 23b are provided, at least a portion 41a of the coupler rubber 40 is exposed between both the couplers 23a and 23b, and the exposed portion 41a is provided with a mark 41b indicating the fitting direction of the coupler rubber 40.
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