Electrohydraulic steering system

Details Electrohydraulic steering system Electrohydraulic steering system

1995-03-02

1996-03-12

Look, Edward K.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Separate valve means actuatable by a common nonmanual...

91529, 91459, 91461, 60385, 180142, F15B 1100

Patent

active

054976928

ABSTRACT:
An electrohydraulic steering system has a pair of proportional valves for controlling displacement of a steering valve for normal steering functions. The proportional valves are selectively energized by a position sensor in response to rotation of a steering wheel. However, should an electrical malfunction occur, rotation of the steering wheel beyond the normal operating range causes a steering control member to mechanically move an armature of the proportional valves through a spring to provide mechanical/hydraulic steering. Making the armatures of the proportional valves responsive to a mechanical input through the springs provides a simple, cost effective mechanical/hydraulic backup for the primary electrohydraulic steering control.

REFERENCES:
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patent: 3922953 (1975-12-01), Strauff
patent: 3948050 (1976-04-01), Kervagoret
patent: 4194361 (1989-03-01), Pahl et al.
patent: 4385493 (1983-05-01), Lang
patent: 4926956 (1990-05-01), Duffy
patent: 5052506 (1991-10-01), Nishimori et al.
patent: 5234070 (1993-08-01), Noah et al.
patent: 5236057 (1993-08-01), Takehara et al.
patent: 5267629 (1993-12-01), Mouri

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