B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
180/55, 138/57
B62D 5/08 (2006.01) B62D 5/07 (2006.01)
Patent
CA 1060757
A B S T R A C T A powder steering system is disclosed which selectively con- trols the flow of fluid to a steering motor and an auxiliary device, and may have as its source of pressurized fluid either a fixed displacement pump, a variable displacement pump, or a load sensing pump. The system includes a steering control valve dis- posed between the pump and the steering motor, and an externally pilot operated flow control valve, specifically, a priority valve, disposed between the pump and the steering control valve, such that the entire system flow enters the priority valve. The priority valve includes an inlet port connected to the pump, a steering outlet port connected to the steering control valve, and an auxiliary outlet port connected to the auxiliary device. The priority valve includes a valve member which is biased toward a position permitting substantially all of the flow from the inlet port to pass to the steering outlet port. The steering control valve includes a fluid meter and the valving defines a first variable orifice disposed between the inlet of the steering con- trol valve and the fluid meter and operable to establish the fluid flow rate to the steering motor. A load pressure signal taken on the downstream side of the first variable orifice is communicated to the priority valve to exert a biasing force on the valve member in the same direction as the biasing mean. A pilot pressure signal taken upstream form the first variable -i- orifice is communicated to the flow control valve to exert a biasing force on the valve member in a direction opposite that of the biasing means to maintain a pressure drop across the first variable orifice substantially equivalent to the force of the biasing means. -ii-
278575
Johnson Oliver W.
Larson Bernard J.
Yip James K.
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