| 摘要 |
PURPOSE:To change leverage with loading condition by providing two reaction transmitting memebers making reaction act on a reaction lever on an output member to make these action points different from each other. CONSTITUTION:Reaction from a master cylinder is normally transmitted to a reaction lever 19 through a reaction plate 20 of an output member 18 and a first reaction transmitting member. An action point is then G. However, when loaded weight is relatively large, a leverage change-over switch is changed over to supply current to and rotate a motor 22 for a predetermined time. Then a worm wheel 24 and an output member 18 rotate. Then a reaction plate 27 of a second reaction transmitting member threaded into the output member 18 moves in the direction of arrow and contacts the reaction lever 19 at a point K, while the reaction plate 20 is separated from said lever 19. Thus, the reaction acting point is changed over from G to K so that the leverage is enlarged. |
