Hydraulic control apparatus for a servo-motor, particularly for

Details Hydraulic control apparatus for a servo-motor, particularly for Hydraulic control apparatus for a servo-motor, particularly for

1980-08-14

1982-12-21

Walton, George L.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

60384, 137111, F15B 13042

Patent

active

043643027

ABSTRACT:
The invention relates to a steering control unit for a bidirectional servomotor which is connectable to steerable wheels. A steering wheel controlled quantity setting unit of a known type has ports connectable to a pump and a return tank and two control ports through which metered quantities of fluid flow to opposite sides of the servomotor and to other parts of the apparatus for actuating the servomotor. A directional control valve for selectivity directing pressurized fluid from a power circuit to opposite sides of the servomotor is controlled by a control circuit containing the setting unit. A utility valve having the pressure regulating and control and power valve capabilities required for this type of apparatus is characterized by having only a single slide spool for performing all of these functions.

REFERENCES:
patent: 3543783 (1970-12-01), Ifield
patent: 3561488 (1971-02-01), Byers
patent: 3566749 (1971-03-01), Allen et al.
patent: 4052929 (1977-10-01), Baatrup et al.
patent: 4266464 (1981-05-01), Baatrup et al.

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