Pressure modulating control valve for steering systems or the li

Details Pressure modulating control valve for steering systems or the li Pressure modulating control valve for steering systems or the li

1977-07-18

1979-03-27

Pekar, John A.

Motor vehicles

Steering by driving

Endless flexible track

192 13R, 137596, 13762568, B62D 1108

Patent

active

041461029

ABSTRACT:
Steering control valves selectively pressurize and vent fluid-actuated clutches and brakes of a crawler tractor steering system. Each control valve has an internal spool assembly, coupled to a foot pedal by a cable, which modulates brake pressure as a function of a pedal position and which establishes a maximum brake fluid pressure thereby eliminating the need for additional system components for such purposes. The control valves also provide a feedback fluid pressure, to resist pedal depression with a force proportional to the brake fluid pressure, enabling an operator to sense the degree of braking which is present at different degrees of pedal depression.

REFERENCES:
patent: 2941639 (1960-06-01), Christenson
patent: 3173339 (1965-05-01), Larsen
patent: 3222868 (1965-12-01), Stelzer
patent: 3354788 (1967-11-01), Garrison et al.
patent: 3374846 (1968-03-01), Massone
patent: 3494449 (1970-02-01), Umeda et al.
patent: 3589481 (1971-06-01), Motsch

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