| 摘要 |
PURPOSE:To reduce a degree of body vibrations as well as to improve a feeling of driving comfortableness so better, by mounting an engine on a rear arm free of vibration in a separate manner. CONSTITUTION:Revolution of an engine 58 is transmitted to a rear wheel via a stepless transmission 66, a final reduction gear 62 and a driving shaft 68, while reaction force of driving force to be added to the rear wheel is transmitted from the final reduction gear 62 to a rear axle 48 and a torque arm in order, and further transmitted to a rubber damper 46 at the front end. The exciting direction by primary inertia force of the engine 58 is set so as to become an almost vertical direction to a surface connecting an engine supporting shaft 59, a driving shaft 66a and a driven shaft 66b, whereby the engine vibrates up and down centering on the supporting shaft 59. Therefore, vibrations of the engine 58 are absorbed by deformation in a shearing direction of the rubber damper 64 so that the engine vibration transmitted to the torque arm 44 as a rear arm and a noise also are reduced, thus a feeling of driving comfortableness is improved so better.
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