JPH0195410U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is an overall view showing the vehicle height adjustment device according to the embodiment of the present invention, Figs. 2 and 3 are sectional views showing the structure of each check valve, and Fig. 4 shows the operation of each part of the device according to the embodiment. It is a time chart. 1... Pump, 2... Engine, 4b... (main) accumulator, 5... Hydraulic pressure supply circuit, 6... Pressure control valve, 7... Check valve, 8... Drain circuit, 9... Output circuit, 11... Vehicle height adjustment actuator , 14... Drain side first check valve, 15...
Drain side second check valve, 81...first drain path, 82...second drain path.

Claims (1)

[Scope of Claim for Utility Model Registration] An accumulator that temporarily stores hydraulic pressure supplied from an engine-driven pump, a check valve on the supply side provided between the accumulator and the pump, and a hydraulic pressure supply circuit connected to the accumulator. a pressure control valve that is connected to the drain circuit and also connected to the drain circuit side and controls output hydraulic pressure; a vehicle height adjustment actuator that is driven by the output hydraulic pressure of the pressure control valve and controls the vehicle height and attitude; A first drain path and a second drain path are formed by branching the drain circuit into two in parallel, and a hydraulic pressure provided in the first drain path and between the pump and the first check valve is set as a pilot pressure,
a first check valve on the drain side that opens when this hydraulic pressure exceeds a set hydraulic pressure; and a first check valve on the drain side that is provided in the second drain passage and that uses the hydraulic pressure of the accumulator as a pilot pressure and opens when this hydraulic pressure exceeds the set pressure. A vehicle height adjustment device comprising: a second check valve;