| 摘要 |
A gear housing is prevented from longitudinal movement by variable-resilience stopper means which are rotatable to have, with respect to a force of the same magnitude, a variable resilience or rigidity depending upon varying angular position of the stopper means. The angular position of the stopper means is controlled by driving means in such a manner that the stopper means have a minimum resilience or maximum rigidity upon vehicle low-speed running conditions and a maximum resilience or minimum rigidity upon vehicle high-speed running conditions.
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