| 摘要 |
A free-wheel hub is configured so that: a four-wheel drive state is maintained by an elastic member (29) for pressing an outer reinforcement plate (15) for a diaphragm (13); a slide gear (11) is disengaged from an outer gear (8) by the deformation of the diaphragm (13) toward a two-wheel drive-side negative pressure chamber (21); and a two-wheel drive state is maintained by the action of a magnet (30) which attracts the outer reinforcement plate (15). The weight of a movable part, such as the slide gear (11), which moves with the diaphragm (13) is reduced by material removal to reduce a load generated by vibration (G), thereby increasing force for maintaining the two-wheel drive state. |
