Closed-center hydraulic servo apparatus

Details Closed-center hydraulic servo apparatus Closed-center hydraulic servo apparatus

B - Operations, Transporting

60

T

303/81

B60T 1/00 (2006.01) B60T 13/14 (2006.01)

Patent

CA 1193635

ABSTRACT OF THE DISCLOSURE A closed-center hydraulic servo apparatus (10) includes a closed-center valve device (112) which is coupled to an input mem- ber (60) to control the communication of fluid among a fluid pressure source (12,14), a fluid reservoir (36), and a fluid pressure responsive device (a vehicle brake) (16) in response to movement of the input member (60). The coupling (158, 160) between the closed-center valve device (112) and the input member (60) provides a movement ratio there- between which is greater than unity. As a result, the inherent dead- band (D) of the closed-center valve device (112) is reduced by the inverse of the movement ratio to a level (d) which is sensible to an operator at the input member (60). Particularly for use in automotive vehicle hydraulic braking systems. (Figure 1)

402714

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