Servo steering gear

Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type

Patent

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Details

91391R, 92110, F15B 910, F15B 1310

Patent

active

042000300

ABSTRACT:
A power steering gear mechanism is disclosed having conventional elements such as a double acting cylinder in a housing, a piston with a gear rack geared to a gear sector, and threaded bore in the piston having a worm shaft, wherein a steering shaft operates a rotary valve spool with which it is integral, in rotation relative a fixed valve sleeve carried by the worm shaft and wherein a torque rod connects the worm shaft to the steering spindle and passes through the worm shaft. The novelty of the invention resides in hydraulic circuitry and in the placement of a pin carried by the worm shaft and passing through a bore in the body of the valve spool just beyond one end of the channelled flow control area, the steering shaft extending from the other end of the valve spool. The pin effects rotation of the worm shaft by engaging the side of the bore through the valve spool body during twisting of the torque rod to effect piston movement. The arrangement of the coaction of the pin with the valve spool body effects advantages such as compactness of the overall mechanism and ensures manual drive of the piston in event of breakage of the torque rod.

REFERENCES:
patent: 3359866 (1967-12-01), Folkerts
patent: 3508467 (1970-04-01), Folkerts
patent: 3773081 (1973-11-01), Venable et al.
patent: 3921669 (1975-11-01), Goff

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