| 摘要 |
PROBLEM TO BE SOLVED: To reduce burden of a solenoid to change a spring constant of an air spring on an air suspension device. SOLUTION: The air springs 12, 13 left and right of a vehicle body are connected to each other by conduits 14, 15. A pilot type control valve 22 is provided in the conduit 15, a pilot conduit 23 is connected to the conduit 15, and a pilot valve 24 is provided. Vehicle height is adjusted by supplying and discharging compressed air to and from the air springs 12, 13 through a vehicle height adjusting part valve 16. When the pilot conduit 23 is closed by the pilot valve 24, the control valve 22 is closed and the spring constant of the air springs 12, 13 become large. When the pilot conduit 23 is opened, the control valve 22 is opened by pressure of the air spring 12, the left and right air springs 12, 13 are communicated to each other, and the spring constants become small. As the control valve 22 can be opened by the pressure of the air spring 12, it is possible to reduce the burden of the solenoid of the pilot valve 24.
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