Control valve having parasitic leakage orifices

Details Control valve having parasitic leakage orifices Control valve having parasitic leakage orifices

1994-11-14

1996-04-09

Lopez, F. Daniel

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91437, F15B 910

Patent

active

055051197

ABSTRACT:
The present invention is directed to a vehicular power steering system having an "open-center" control valve that has substantially zero hydraulic flow gain at zero input deflection angle and yet has minimal control orifice area. An improved valving sub-assembly is used in the control valve with functions to rapidly restore hydraulic gain at relatively small input deflection angles. The improved valving arrangement includes small transverse leakage slots formed in a valve spool that are in fluid communication with either input or return flow distribution slots. The leakage slots are configured to form parasitic flow orifices which fluidically interconnect the output slots formed in the valve sleeve and which communicate with the fluid chambers formed on opposite sides of the piston in the power cylinder. Accordingly, a selectively variable leakage path is provided across the power cylinder. The parasitic flow orifices have uniform and/or non-uniform areas for permitting the performance characteristics of the valving sub-assembly to be readily customized.

REFERENCES:
patent: 3730207 (1973-05-01), Christensen
patent: 4425759 (1984-01-01), Krusche
patent: 4561516 (1985-12-01), Bishop et al.
patent: 4678052 (1987-07-01), Suzuki et al.
patent: 4768604 (1988-09-01), Schipper
patent: 4848402 (1989-07-01), Elser et al.
patent: 4924910 (1990-05-01), Tabata et al.
patent: 5086687 (1992-02-01), Elser et al.

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