| 摘要 |
756,716. Hydro-pneumatic springs; spring suspensions. SOC. D'INVENTIONS AERONAUTIQUES ET MECANIQUES S.I.A.M. Aug. 4, 1954 [Aug. 10, 1953], No. 22665/54. Classes 108 (2) and 108 (3). A hydro-pneumatic spring for a vehicle wheel suspension comprises a piston 14 and a cylinder 12 having a pressure chamber 16, a pump 24, a reservoir 23 and an accumulator 18, and is characterized in that the cylinder 12 has an annular recess 20 working in conjunction with conduits 27 and 30 formed in the piston 14, conduit 27 being connected to the reservoir 23 and conduit 30 being connected to the pump 24, both conduits opening on to the piston surface at such a distance from each other relative to the recess 20 that in an equilibrium position of the piston both conduits are in communication with the recess 20 while in a deflected position of the piston only one conduit communicates with the recess and thereby restores the piston to its position of equilibrium. The recess 20 is constantly connected to the pressure chamber 16 by means of a conduit 33. A conduit 19 connects the chamber 16 to the accumulator 18 for flow of liquid which is damped by a perforated non-return valve or valves 26. The accumulator is shown as an air vessel but may be a spring-loaded piston and cylinder, or a vessel containing extensible walls, or a liquid filled vessel containing compressible balls. An annular recess 21 drains liquid leaking past the piston 14 and returns it to the reservoir. Movement of the piston into the cylinder is limited by a cushion 37. In a wheel suspension (Fig. 1, not shown), a swivel pin is pivoted to a chassis cross arm by upper and lower links and the piston and cylinder work under compression between the cross arm and the lower link.
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