JPH01157009U - - Google Patents

Description

[Brief explanation of drawings]

The drawing is an overall view of a hydraulic suspension device according to an embodiment of the present invention. 2... Output circuit, 3... Pressure control valve, 4... Switching valve, 42... Valve spool, 6... Liquid pressure supply circuit, 7... Drain circuit, 8... Accumulator, a, b... Throttle , 10a to 10d...hydraulic cylinder (suspension unit).

Claims (1)

[Scope of Utility Model Registration Claims] 1. A suspension unit that is disposed between the vehicle body and the axle and is operated by hydraulic pressure to change the vehicle height; a pressure control valve that is operated by a control signal to selectively connect the output circuit to a hydraulic pressure supply circuit and a drain circuit to control output hydraulic pressure to the output circuit; and a pressure control valve disposed in the middle of the output circuit. is connected to the pressure control valve and suspension unit, and
Furthermore, if the suspension unit is connected to an accumulator capable of absorbing hydraulic pressure and the hydraulic pressure on the pressure control valve side is high in the output circuit, communication between the suspension unit and the accumulator side is restricted, and communication with the pressure control valve is restricted. a switching valve that operates to allow more communication and to restrict communication between the suspension unit and the pressure control valve when the hydraulic pressure on the suspension unit side is high, and to allow more communication with the accumulator side; A hydraulic suspension device comprising: 2. The switching valve has a valve spool that is slidably provided in the valve hole and forms a throttle in the middle of the output circuit, and one end of the valve spool receives hydraulic pressure upstream of the throttle. The other end receives the hydraulic pressure downstream of the throttle, and when the hydraulic pressure upstream of the throttle is higher than the hydraulic pressure downstream of the throttle, the stroke of the valve spool causes the throttle from the suspension unit to the pressure control valve to open, and the accumulator By stroking the valve spool when the hydraulic pressure downstream of the throttle is higher than the hydraulic pressure upstream of the throttle, the throttle from the suspension unit to the pressure control valve is on the closing side, and communication to the accumulator is increased. 2. The hydraulic suspension device according to claim 1, wherein the hydraulic suspension device is configured to have a larger value.