| 摘要 |
911,492. Adjusting body height. DUNLOP RUBBER CO. Ltd. June 1, 1959 [June 21, 1958], No. 19952/58. Class 108(2). In a pneumatic suspension system, the height of springs 1, 2, 3, 4 is regulated respectively by valves 12, 13, 14, 15, or, under certain circumstances, the valve 12 may; control both springs I and 2, whilst the springs 3 and 4 are separately controlled by valves 14 and 15. In the latter case the springs 1 and 2 are interconnected by a pressure line 25, in which there is a three-way cock 26. This cock is also located in a conduit 24 connecting the spring 2 to the levelling valve 13. In one position of the cock. the levelling valve 13 communicates directly with the spring 2 and connection between springs 1 and 2 is prevented, whilst in the other position of the cock the valve 13 is disconnected from the spring 2 which is put in direct communication with the spring 1 and the levelling valve 12. A delivery valve mechanism 10 permits either fast or slow flow of air to and from the springs. Inlet valve 27 allows air to flow from a high pressure tank 8 to the air springs whilst a valve 28 allows air to flow from the springs to a low pressure tank 22. When the vehicle is stationary or moving very slowly the valves 27, 28 are opened widely by a spring 29 to enable a speedy levelling response to be obtained. When the vehicle is moving more quickly a slower response is required and this is obtained by moving both valves to a nearclosed position which throttles the flow of fluid in both directions. This is brought about by a solenoid 31 which when energized holds the valves in the near-closed position. The three-way cock 26 is also operated by a solenoid 32, so that upon energization of solenoid 32 the cock is moved to a position which provides four point levelling. The cock is moved to its other position by spring means. Both solenoids are connected in series in a circuit which incorporates a switch operated by a centrifugal governor mechanism, so that when the vehicle is movng at more than a predetermined speed the switch closes the circuit and energizes the solenoid, thus changing over from three to four point levelling.
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