| 摘要 |
PROBLEM TO BE SOLVED: To rigidly support a driven shaft by making a case body support the shaft end part protruding from the case body side in the driven shaft of a V-belt type automatic gearbox through a supporting bracket extending from the case body side to the cover side. SOLUTION: A V-belt type automatic gearbox in an unit swing type power unit for a motor-scooter type motor-bicycle is structured by wrapping a V-belt between a driving pulley and a driven pulley 28 on a driven shaft 27 side. The driven pulley 28 is composed of a fixed sheave 35 fixed to the end part of a cylindrical supporting shaft 34 on the driven shaft 27 and a movable sheave 37 rotatably and fittedly inserted in the peripheral part of the supporting shaft 34, and the movable sheave 37 is energized toward the fixed sheave 35 side by a compression coil spring 38. In this case, the shaft end part of the driven shaft 27, which protrudes from a case body 23, is supported by the case body 23 through a supporting bracket 53. Thereby, the driven shaft 27 can be supported at its both ends so as to be rigidly supported.
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