| 摘要 |
936,273. Vehicle suspension systems. ARMSTRONG PATENTS CO. Ltd. Nov. 30, 1959 [Dec. 6, 1958], No. 39385/58. Addition to 867,514. Class 108(2). A vehicle suspension comprises a pneumatic spring 20, Fig. 1, and a hydraulic shock absorber 18 connected to and controlling hydraulic means 32 to vary the spring 20 so as to maintain constant vehicle height. The springs 20 are connected by conduits 26 to the space beneath a diaphragm 30 having its upper side connected by conduits 34 to the shock absorbers 18 which are similar to those described in the parent Specification. A cam operated valve in each shock absorber allows it to pump liquid into the space above the diaphragm when the vehicle falls below the desired level so as to expand the springs 20 and to have liquid returned from the space to a reservoir within its casing when the vehicle rises. When the vehicle is at the desired level repeated momentary opening of the valve keeps the pressure above the diaphragm 30 constant. In Fig. 2 each pneumatic spring 36 has a number of superposed chambers separated by imperforate plates and carries a hydraulic ram 38 controlled through a conduit 40 from the shock absorber 18. A spring similar to that shown at 36 may have its lower end connected by a conduit to the shock absorber so that it is partly filled by hydraulic fluid while in other constructions the piston or cylinder of a ram is connected to the lower link 10 and the ram piston or a diaphragm separates the hydraulic fluid from the pneumatic spring. In Fig. 6, the shock absorber 18 has a separate reservoir 19 and is connected to a housing 68 containing a piston 70 and a diaphragm 72. The space beneath the latter is connected to the pneumatic spring 84 so that the small high-pressure movements of the hydraulic fluid are transformed into large volume changes of the lowpressure fluid in the spring.
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