| 摘要 |
869,640. Maintaining vehicle height constant; hydropneumatic springs. ARMSTRONG PATENTS CO. Ltd. Dec. 31, 1958 [Jan. 7, 1958], No. 563/58. Classes 108(2) and 108(3). A hydropneumatic suspension unit incorporates a pump to maintain a suitable working pressure. Liquid spaces A, B, on either side of a piston 6 working in a cylinder 4 are bounded respectively by flexible diaphragms 5, 26, on the other sides of which are respective compressed air spaces 7, 27. On rebound stroke of the piston 6, liquid is drawn through a valve 23 from the space A to a pump cylinder 12. On compression, this liquid is forced by pump plunger 9 through a valve 22 and passage 9c into the space B. When a predetermined vehicle height is reached, a shoulder 9b of the plunger 9 engages a ball 15 to unseat a valve 17 and thus permit liquid to escape from space B via a passage 19, valve 17, and a passage 20, to space A. Damping is provided by apertures 10c in a valve 10b. The cylinder 4 is flexibly mounted by a rubber bush 25 in the housing 2 of the unit. This enables the piston 6 and connecting rod 6a to be unitary.
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