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    • 2. 发明公开
    • Hybrid load sense vehicle hydrostatic steering system
    • 混合载荷感知车辆水力转向系统
    • EP0107829A3
    • 1985-01-09
    • EP83110127
    • 1983-10-11
    • TRW INC.
    • Rau, Jim L.LaHue, Ronald L.
    • B62D05/06B62D05/08
    • B62D5/093
    • In a hydrostatic load sense vehicle steering system, fluid flow from a source is used by a hydrostatic steering controller to effect steering of the vehicle. The controller has a metering unit and a control valve which, in response to a steering effort, moves away from a neurral position to an operating condition in which it (I) establishes a main flow control orifice which directs fluid from the source to the metering unit and (ii) directs metered fluid to a steering motor. A fluid actuator controls the flow of fluid from the source to the hydrostatic steering controller. A pilot fluid circuit directs a pilot flow of fluid to the controller which is used to control the operation of the fluid actuator. In the controller, the control valve directs the pilot fluid to a reservoir when there is no steering. The system is designed to come to a standby condition in which the amount of pilot fluid being directed to the controller is high enough that it can be used to satisfy a range of low demand steering maneuvers. In providing the pilot flow, the system develops hydraulic biasing forces on the components of the fluid actuator. The hydraulic biasing forces help the system respond to a high demand steering maneuver to increase rapidly the amount of fluid which is made available for effecting steering.
    • 3. 发明公开
    • Load sensing system
    • 负载感应系统
    • EP0096963A3
    • 1985-01-09
    • EP83302623
    • 1983-05-10
    • EATON CORPORATION
    • Yip, James Kwok-FunNovacek, William John
    • B62D05/06B62D05/08F15B11/05
    • B62D5/09Y10T137/87185
    • An improved fluid controller (17) is disclosed of the type for use in a load sensing hydrostatic steering system. The system includes a load sensing priority flow control valve (15) of the type which operates on a dynamic load signal. The controll includes a spool valve (95) and a sleeve valve (97) which cooperate to define a plurality of orifices including a main variable flow control orifice (71) and a variable orifice (75) through which fluid flows from the return side of a steering cylinder (19) to the return port (25) of the controller. A variable drain orifice (76) communicates between the main flow path, downstream of the main orifice (71) and the return port (25). As the control- ler valving moves from its neutral position toward an operating position, the orifice (75) begins to open at least as soon as the main orifice (71) and reaches a predetermined flow area before the main orifice )71) reaches that predetermined flow area. In addition, the drain orifice (76) remains open at least until the variable orifice (75) begins to open to reduce undesirable high transition pressures in the controller.
    • 5. 发明公开
    • Vehicle steering apparatus
    • EP0081658A3
    • 1984-05-30
    • EP82109689
    • 1982-10-20
    • TRW INC.
    • Dymond, Richard Warren
    • B62D05/06B62D05/08
    • An improved power steering apparatus includes a pressure modulation assembly which modulates the fluid pressure transmitted from a power steering control valve to a power steering motor. The modulation assembly varies the fluid pressure output from the steering control valve as a direct function of variations in vehicle speed. This results in relatively easy steering for parking and low speed maneuvers and a firmer feel for maneuvers at higher speeds. The pressure modulation assembly is connected in series fluid communication with and between the power steering control valve and the power steering motor and includes a pair of pressure modulation valves. Fluid for actuating the power steering motor flows from the power steering control valve through the pressure modulation valves to the power steering motor. The pressure modulation valves are biased closed by the output pressure from an auxiliary pump which is driven at a speed which varies as a function of vehicle speed. Thus, the pressure of the fluid delivered to the power steering motor is reduced by the pressure modulation valve to an extent determined by the magnitude of the biasing force derived from the speed dependent auxiliary pump.