Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Reexamination Certificate
1999-12-22
2001-07-03
Ryznic, John E. (Department: 3745)
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
C091S164000, C180S438000
Reexamination Certificate
active
06253657
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an apparatus for use in turning steerable vehicle wheels.
BACKGROUND OF THE INVENTION
A known apparatus for use in turning steerable vehicle wheels includes a housing which encloses a piston. A hollow piston rod extends from the piston and projects outward from one end of the housing. The piston rod is connected with a vehicle steering linkage. A compensator chamber is provided in the hollow piston rod to enable the working areas on opposite sides of the piston to be equalized.
SUMMARY OF THE INVENTION
The present invention provides a vehicle steering apparatus for turning steerable wheels of a vehicle. The apparatus includes a member movable linearly in opposite directions to turn the steerable wheels in opposite directions. A housing has a chamber into which the member extends. A piston secured to the member is located in the chamber.
The piston divides the chamber into first and second chamber portions. Fluid pressure in the first chamber portion acts on a first area of the piston to cause linear movement of the member in one direction. Fluid pressure in the second chamber portion acts on a second area of the piston to cause linear movement of the member in a second direction opposite the one direction. The second area of the piston is less than the first area of the piston. A spring acts to urge the member in the second direction. The spring applies a force to the member to balance the forces acting on the member to move the member when the pressure in the first chamber portion equals the pressure in the second chamber portion.
REFERENCES:
patent: 2067363 (1937-01-01), Waeschle
patent: 2524012 (1950-09-01), Groebe
patent: 2787253 (1957-04-01), Boothe
patent: 2789510 (1957-04-01), Meynig
patent: 4170169 (1979-10-01), Shafer
patent: 4418781 (1983-12-01), Rabe et al.
patent: 5165322 (1992-11-01), Moody
patent: 5755097 (1998-05-01), Phillips
patent: 6098742 (2000-08-01), Cartwright
patent: 2115 (1855-09-01), None
Ryznic John E.
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
TRW Inc.
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