| 摘要 |
921,592. Vehicle spring suspensions. ARMSTRONG PATENTS CO. Ltd. Dec. 15, 1961 [Dec. 30, 1960], No. 44699/60. Addition to 867,514. Class 108(2). In the vehicle suspension of parent Specification, in which riding movement of a vehicle axle is damped by a double acting, lever type, hydraulic shock absorber, -Figs. 9 and 10, one or both cylinders 70 of which is/are connected to a hydraulic chassis-height correcting ram through a pipe controlled by a valve 90 which is opened and closed by co-operation of a plunger 94 with a cam surface 96 which is rotatable with a semi-rotating shaft 38 of the shock absorber on relative movement between the axle and chassis due to changes in vehicle loading, an auxiliary spring is arranged to act in parallel with the main spring which is supported directly from the vehicle frame, the auxiliary spring having one region located relative to the vehicle frame by the hydraulic ram. As shown in Fig. 1, the vehicle suspension comprises a lower wishbone 16 and an upper wishbone 20 which acts as the lever arm for the shock absorber 26, the main spring 10 being connected to the vehicle frame 14 and to the wishbone 16 and being coaxial with the auxiliary spring 12 which is connected between the wishbone 16 and the free end of the ram 30, the cylinder 28 of which is secured to the frame 14. In modifications, a main coil spring and a main longitudinally disposed leaf spring each is associated with an auxiliary longitudinally disposed leaf spring, one end of which is connected to the ram, for supporting a vehicle axle and in another modification, an independent suspension comprises a main coil spring associated with an auxiliary torsion bar spring which is torsionally secured to the lower wishbone member, the end of the torsion spring remote from the wishbone being connected to the vehicle frame through a bracket carried by the ram, allowing the attitude of the torsion spring relative to the frame to be fixed by the ram. A reversal of the latter arrangement is described, in which the lower wishbone is rotationally secured to a torsion spring secured at its other end to the vehicle chassis and an auxiliary coil spring is interposed between the lower wishbone and the ram. In a further embodiment, Fig. 6, a main torsion spring 56 is secured to the vehicle frame 14 by a bracket 55, its other end being secured to a link pivoted at 58 to a link 60 fixed to the vehicle axle 11. An auxiliary torsion spring 52 is secured at one end to a link 53 pivoted to a link 60 fixed to the axle 11 and at the other to a bracket 54 carried by the ram 30. The lever 24 of the shock absorber 26 is connected by links 22 (adjustable) and 26 to the vehicle axle 11. A similar arrangement is described wherein the main torsion spring is replaced by a longitudinal leaf spring and in Fig. 8, the longitudinal leaf spring becomes the auxiliary spring, being attached at one end through the shackle assembly 46 to the vehicle frame, the torsion spring 56 being the main spring.
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