Power steering control valve

Details Power steering control valve Power steering control valve

1997-11-17

1999-08-10

Oberleitner, Robert

Motor vehicles

Steering gear

With fluid power assist

91375A, 13762524, B62D 508

Patent

active

059344059

ABSTRACT:
A vehicle steering apparatus (10) includes a fluid motor (42) having first and second chambers (44, 46). A relatively rotatable, coaxial valve core (22) and valve sleeve (24) control the fluid pressure in the chambers (44, 46). The valve sleeve (24) has first and second recesses (72a, 74a) spaced around an axis (26) on opposite sides of a fluid inlet port (70a). The valve core (22) has a third recess (80a) which communicates the port (70a) with the first and second recesses (72a, 74a) when the valve core and valve sleeve (24) are in the neutral position. The valve core (22) has first and second axially extending lands (90a, 90b) on opposite sides of the third recess (80a) and land surfaces (92a, 92b) facing the first and second recesses (72a, 74a). The valve core (22) has a first passage (100a) for communicating with the first recess (72a) and a second passage (100b) for communicating with the second recess (74a) when in the neutral position. The first and second passages (100a and 100b) includes a first slot (130a) in the first land (90a) and a second slot (132b) in the second land (90b) terminating in a rectangularly shaped opening (134a) in the land surface and extending parallel to the axis (26).

REFERENCES:
patent: 5259413 (1993-11-01), Harpole et al.
patent: 5357845 (1994-10-01), Sangret
patent: 5730040 (1998-03-01), Strong
patent: 5842538 (1998-12-01), Sangret

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