Arrangement for control of two hydraulic pressure systems, inclu

Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain

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91532, B62D 508

Patent

active

041740181

ABSTRACT:
A simplified overall hydraulic control system is provided for dual systems comprising a booster steering power cylinder and the power cylinder of an accessory of a work vehicle pressurized from a common engine driven hydraulic pump. The system utilizes conventionally constructed multiway valves for steering and accessory control and comprises flow dividing means effecting a constant minimum flow rate at all operational times for steering and variable flow rates for accessory power and additionally for steering dependent upon demand, essentially under vehicle operator control.
A main steering flow to the steering control valve can connect with the minimum steering flow through a one way valve when steering is effected, less such flow as may be directed for accessory power by operation of the accessory control valve. The one way valve is so arranged as to block main steering flow from connection to minimum steering flow in neutral steering control valve position, the minimum flow then shunting to the oil supply tank.
Main steering flow is additive to accessory power flow at all times but diminished in rate dependent upon a desired rate of accessory operation. Thus, when no steering is effected, all hydraulic pump output can be utilized for powering an accessory, except for the constant minimal steering flow which bypasses through the multiway steering control valve back to the system tank, a relatively small loss in accessory power.

REFERENCES:
patent: 4005636 (1977-02-01), Dunn
patent: 4070857 (1978-01-01), Wible
patent: 4075840 (1978-02-01), Jesswein

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