Title:
【発明の名称】負荷応答流量増幅型制御装置
Document Type and Number:
Japanese Patent JPH04501093
Kind Code:
A
Abstract:
Flow amplified control systems are useful in pilot operated steering systems. The load responsive flow amplified control system includes a directional control valve movable to an operating position to direct fluid from the operating fluid circuit through a variable orifice to a steering motor and to direct control fluid from a control fluid circuit through another variable orifice to be combined with the fluid going to the steering motor. The operating fluid circuit and the control fluid circuit are provided with fluid from a common variable displacement pump. The directional control valve is moved to an operating position by the control fluid acting thereon and is pressure compensated insofar as the flow of control fluid passing through the another variable orifice such that a substantially constant predetermined pressure differential exists across the another variable orifice. The rate of fluid flow in the pilot control circuit is determined by a steering control valve and is utilized for controlling the position of the directional control valve. The displacement of the variable displacement pump is responsive to the pressure condition in the pilot control circuit such that a substantially constant predetermined pressure differential exists between the variable displacement pump and the load pressure in the steering motor. The relative size of the variable orifices determines the amplification ratio between the pilot control circuit and the power operating circuit.
Inventors:
Jermain, Jean Earl.
Wagoner, John Bee.
Wagoner, John Bee.
Application Number:
JP50933589A
Publication Date:
February 27, 1992
Filing Date:
August 11, 1989
Export Citation:
Assignee:
Caterpillar Incorporated
International Classes:
B62D5/07; B62D5/087; B62D5/09; (IPC1-7): B62D5/07; B62D5/087; B62D5/09
Domestic Patent References:
| JPS6444380A | 1989-02-16 | |||
| JPS61139561A | 1986-06-26 |
Foreign References:
| US4535678A | 1985-08-20 |
Attorney, Agent or Firm:
Aoki Akira (4 outside)