Power steering control valve with increased resistance to relati

Details Power steering control valve with increased resistance to relati Power steering control valve with increased resistance to relati

1996-12-09

1998-03-24

Michalsky, Gerald A.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

13762523, F15B 910

Patent

active

057300402

ABSTRACT:
A hydraulic power steering control valve (10) includes a valve core (40) and a valve sleeve (50) supported in a housing (14) for relative rotation about an axis (52). The valve core has an outer periphery (42) adjacent to an inner periphery (44) of the valve sleeve. The control valve has at least three groups of ports (PS1, PS2, PS3) extending through the valve sleeve. Each group of ports includes a fluid inlet port and first and second motor ports for communicating fluid between the control valve and a motor. The control valve is movable from a centered condition to an off-center condition to produce, at each one of the groups of ports, a respective area of high pressure fluid (HP-1, HP-2, HP-3) between the outer periphery of the valve core and the inner periphery of the valve sleeve. The areas of high pressure fluid produce a radially directed force between the valve sleeve and the valve core to increase resistance to relative rotation between the valve sleeve and the valve core. In one embodiment the groups of ports are spaced apart at unequal intervals around the axis. In another embodiment, one of the areas of high pressure fluid is substantially different in size from the other areas of high pressure fluid.

REFERENCES:
patent: 3746045 (1973-07-01), Bunker et al.
patent: 5417244 (1995-05-01), Behrens et al.

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