| 摘要 |
Servo apparatus comprising a closed-center valve device (112) which is coupled to an input member (60) to control the communication of fluid among a fluid pressure source (12, 14), a fluid reservoir (36), and a fluid pressure responsive device such as a vehicle brake (16) in response to movement of the input member (60). …<??>The input member (60) and the valve device (112) are coupled through mutually engaging surfaces which cause the valve device to be shifted at a ratio with respect to movement of the input member which is greater than unity. |
