Power steering cylinder with built in continuously variable stee

Expansible chamber devices – Displacement control of plural cylinders arranged in... – Adjustable abutment positioned within working chamber

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92 135, 92 13, 92 85B, 180 79, 180 793, F01B 3114

Patent

active

049709437

ABSTRACT:
A steering angle limiter is built into an auxiliary power steering mechanism wherein the limits of steering can be variably preset to any predetermined degree within limits in a continuous manner. The limiter is a device built into the power cylinder. Such device comprises a mechanism having threaded telescopic members. One member is axially fixed and manually rotatable by a tool exteriorally of the cylinder to axially shift the other member to a predetermined distance from a respective end of the power piston. The other member may be non-rotative and threaded to the first member or it may be rotative but threaded to the housing. In either event, it is guided for axial movement. The axial setting of the other member effects a limit stop or abutment for the moving piston for such distance of movement as desired to limit the steering angle of the vehicle wheels in a particular direction of steering. For a double acting cylinder a steering limiter as described is provided for each end of the cylinder. In one embodiment of the invention an arrangement of oil discharge channels in conjunction with a damping piston forces oil being expelled from a pressure chamber to act as a shock absorber to slow down exhaust.
All embodiments of the invention have at least one port passing radially through a telescopic member to serve as a throttle for return oil.

REFERENCES:
patent: 3003470 (1961-10-01), Geyer
patent: 3130646 (1964-04-01), Pennington
patent: 3156160 (1964-11-01), Meyer et al.
patent: 3815480 (1974-06-01), Spyra
patent: 4517878 (1985-05-01), Hashimoto et al.
patent: 4558759 (1985-12-01), Baatrub et al.
patent: 4646623 (1987-03-01), Stoll
patent: 4699044 (1987-10-01), Riggs

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