Closed-center hydraulic servo apparatus

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

1981-06-12

1983-12-27

Hershkovitz, Abraham

Power plants

Pressure fluid source and motor

Pulsator

60553, 60560, 60566, 91434, B60T 1300

Patent

active

044222939

ABSTRACT:
A closed-center hydraulic servo apparatus (10) includes 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 (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 therebetween which is greater than unity. As a result, the inherent deadband (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).

REFERENCES:
patent: 3074383 (1963-01-01), Schultz
patent: 3526089 (1970-09-01), Fulmer
patent: 3638528 (1972-02-01), Lewis
patent: 3685289 (1972-08-01), Kobashi
patent: 4034825 (1977-07-01), Adams
patent: 4241583 (1980-12-01), Farr
patent: 4320623 (1982-03-01), Farr

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