| 摘要 |
1,120,187. Vehicle suspension &c. ADAM OPEL A.G. 17 Nov., 1966 [3 Dec., 1965], No. 51565/66. Heading B7D. [Also in Division F2] A self-levelling hydro-pneumatic suspension unit comprises a damper piston 63 which works in a cylinder 62 and has a hollow piston-rod 12 with a separating piston 102 which divides the interior of the rod 12 into a high-pressure gas reservoir 100, and a liquid storage space 101, and an outer tube 60 which forms an annular space 71 for a suspension gas spring 90 which is delimited by a tubular flexible diaphragm 91, the space 71 communicating with a lower damper chamber 70 through cut-outs in a closure cap 65 welded to the bottom of the outer tube 60, the chamber 70 being connected to an upper annular chamber 111 by funnel-shaped ducts 110 in the piston 63, and a communicating passage in the piston between the space 101 and the annular chamber 111 being controlled by a valve disc 116 urged on its seat by a spring 120 which is constrained between a stop plate 117 on a valve stem 113 and the piston 63. An abutment spring 130, secured in the cap 65, is adapted to trip the valve 116 after a downward movement greater than distance a from its normal design position M. When the piston descends below the distance a, the spring 130 abuts the valve stop plate 117 and raises the valve disc 116 from its seat so that liquid can flow from the storage chamber 101 into the working cylinder 62 and raise the piston to a position at least above the lowest point of the distance a. When the unit extends beyond its normal length the pressure of the liquid in the annular chamber 111 is sufficient to lift the valve disc 116 so that liquid can flow into the storage space 101 until the piston descends to a position within its normal operating range and the valve disc 116 closes. Extension of the unit is limited when a stop 85 on the piston-rod 12 engages a buffer ring 84 situated beneath a bearing 75. The outer tube 60 carries a tubular flange 25 which rests upon a stub axle holder 26, Fig. 1, the upper end of the piston-rod 12 being mounted rotatably and universally in a support tube 13 by means of a resilient member 15 having a depending buffer portion 22. The stub axle holder 26 is connected by means of a ball joint to a link 33, the other end of which is pivoted, at 34, to a vehicle cross-member 35. In a rear suspension, Fig. 2, the upper end of the rod 12 is universally mounted in a support tube 13 connected to the vehicle chassis 45, the lower end of the cylinder 11 having an eye 46 which, with the interposition of rubber bushes 48, 49, is bolted to a yoke 52 carried by the rear axle support tube 53. |
