Fluid controlled having variable ancillary control functions

Details Fluid controlled having variable ancillary control functions Fluid controlled having variable ancillary control functions

1992-05-01

1993-02-16

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

60384, 91467, F15B 1302

Patent

active

051862115

ABSTRACT:
A hydrostatic power steering device (11;111) is provided of the type including a primary, spool valve (35;135), and a follow-up, sleeve valve (37;137). During normal operation, relative rotation of the spool and sleeve define one or more variable flow control orifices (A1A5; AN; A1) and these orifices have a first area versus deflection relationship when the sleeve is biased to its first position (FIG. 5; FIG. 10). The sleeve may be moved toward a second position (FIG. 6; FIG. 11) in response to an input (95, 99) other than rotation of the vehicle steering wheel. In the second axial position of the sleeve, the flow control orifice has a different area versus deflection relationship, the difference providing a useful steering or ancillary function.

REFERENCES:
patent: 5080135 (1992-01-01), Stephenson

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