Apparatus for controlling fluid flow to a power steering actuato

Details Apparatus for controlling fluid flow to a power steering actuato Apparatus for controlling fluid flow to a power steering actuato

1990-07-25

1993-07-27

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91375A, 180143, F15B 910

Patent

active

052302733

ABSTRACT:
A power steering control valve assembly includes inner and outer valve members and a force transmitting assembly which resists relative rotation between the valve members. The force transmitting assembly includes an upper reaction element which is connected with the inner valve member, a lower reaction element which is connected with the outer valve member and a plurality of force transmitting elements or balls which are disposed between the upper and lower reaction elements. The balls engage recesses in the inner valve member and rotate with the inner valve member. The balls also engage recesses formed in the lower reaction element. In one embodiment of the invention, only three balls are utilized. Hydraulic and mechanical balancing of the power steering control valve is attained by hydraulically balancing the inner and outer valve members before connecting the lower reaction element with the outer valve member. Thus, the lower reaction element is loosely positioned relative to the outer valve member. The upper reaction element urges the balls against the lower reaction element to accurately locate the lower reaction element relative to the inner valve member. The outer valve member and the lower reaction element are then interconnected by deforming a portion of the outer valve member.

REFERENCES:
patent: 4502504 (1985-03-01), Okada et al.
patent: 4793433 (1988-12-01), Emori et al.
patent: 4819545 (1989-04-01), Dymond
patent: 4823839 (1989-04-01), Rayner
patent: 4877100 (1989-10-01), Emori et al.
patent: 4966192 (1990-10-01), Umeda

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