Closed circuit steering circuit for mobile vehicles

Motor vehicles – Steering gear – No mechanical connection between steering shaft and steering...

Reexamination Certificate

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Reexamination Certificate

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06923289

ABSTRACT:
A closed-circuit pump is provided that receives input from a steering unit in order to drive a steering cylinder. The closed-circuit pump is preferably a proportional bi-directional pump. The steering unit includes a steering wheel or similar device controlled by an operator. In one embodiment, the steering unit is a conventional hydraulic system that includes a servo pump. In another embodiment, the steering unit is an electronic displacement control system. The steering cylinder engages with a steering assembly to perform the steering function by physically turning the wheels of the vehicle. The inlet of the steering cylinder includes a counterbalance valve, which prevents flow into the steering cylinder when there is no steering input from the operator.

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patent: 5267627 (1993-12-01), Frank et al.
patent: 5273129 (1993-12-01), Wright et al.
patent: 6068013 (2000-05-01), Arai et al.

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