| 摘要 |
PURPOSE:To make a feeling of comfortable driving securable at all times, by controlling the number of connection to plural pieces of air springs on the basis of medium load according to an increase or decrease in the load and thereby compensating a spring constant, in case of a device bearing the above caption, which interconnects the fluid chamber of these air springs through to the fluid chamber of a hydraulic cylinder. CONSTITUTION:A front wheel suspension 1 secures a hydraulic cylinder to the car body side and couples a piston rod 10 to a lower arm 13 supporting a wheel 4. A fluid chamber 9 of a hydraulic cylinder is interconnected through to a fluid chamber 5 of an air spring 2 partitioned apart from an air chamber 3 by a diaphragm 4 via a throttle 30. In this case, the fluid chamber 9 is made to be selectively connectable to a hydraulic pressure source comprising a hydraulic pump 32 and an accumulator 36 or a fluid tank 31 via a solenoid directional control valve (selector) 37. In addition, the said air spring 2 is connected with air springs 2A and 2B in parallel via solenoid on-off valves 21 and 22. And, each of these solenoid on-off valves 21 and 22 cntrols their opening or closing by a microcomputer 65 on the basis of comparison results between the output of a load sensor 16 detecting load on a spring and the setting value. |
