| 摘要 |
<p>PURPOSE:To reduce a speed change shock, by providing a pressure regulating valve for reducing a fluid pressure in a servo mechanism to a set pressure, in a channel for supplying a pressure fluid to the servo mechanism. CONSTITUTION:When a fluid pressure is supplied to a servo mechanism Bo in response to an increase in throttle opening and rotative speed of an output shaft or a manual operation, the servo mechanism Bo is operated to engage a frictional engaging device, that is, depress brake plates 23 and brake discs 22 through a cushion plate 36, thereby effecting a speed change. In the case that the fluid pressure supplied to the servo mechanism Bo is high, a ball 31 of a pressure regulating valve is moved away from a valve seat to open the valve and thereby release the hydraulic pressure in the servo mechanism Bo. Thus, the operation pressure of the servo mechanism is reduced to a set pressure. Accordingly, a speed change shock may be prevented irrespective of an increase in the fluid pressure from a pressure source by adjusting the set pressure to a pressure corresponding to a resilient force of the cushion plate 36.</p> |
