Hydraulic control device

Details Hydraulic control device Hydraulic control device

1992-03-02

1993-11-23

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91426, 91447, 60468, F15B 1108, F15B 1304

Patent

active

052634000

ABSTRACT:
In a control device (S) for a hydraulic motor (V) which is adapted to be ed upon at both sides, there are provided working conduits (4, 5) which are alternately connectable via a directional control valve (C) to a pressure source (P) and a tank (T), a load holding valve (H) which is hydraulically openable in a controlled way and is arranged in at least one working conduit (4), as well as a control pressure conduit (13) which is connected to the opening side (16) of said load holding valve (H), with pressure variations arising during the controlled opening of the load holding valve, and the amplitudes of the pressure variations being adapted to be dampened in the control pressure conduit (13) at least via a damping throttle (D). To dampen and eliminate the undesired effect of changes in the viscosity of the pressure medium and/or of a damping throttle which is too tightly set, the damping throttle (D) can be bypassed in both directions by a respective check valve (R1, R2, R1', R2,), a great biasing force which biases the one check valve being adjusted to a value which lies between the pressure values of the pressure extremes that act on said check valve and pertain to at least the first amplitude and the next amplitude of the pressure variations.

REFERENCES:
patent: 4041841 (1977-08-01), Haskew
patent: 4118149 (1978-10-01), Hagberg
patent: 4610193 (1986-09-01), Barker et al.
Heilmeier & Weinlein "D7100", Mar. 11, 1991.

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