Patent GB-681836-A (GB)
IPC: B60G7/00
Abstract: 681,836. Spring suspensions; resilient mountings. METALASTIK, Ltd., and HIRST, A. J. April 3, 1951 [April 4, 1950; Jan. 2, 1951], Nos. 8397/50 and 123/51. Classes 108 (ii) and 108 (iii). In an independent suspension for motor vehicle road wheels, the suspension system for each wheel includes at least one divisable swinging wishbone link which on assembly, axially precompresses conical rubber bushes mounted with their larger ends towards each other on reduced ends of hinge pins pivotally connecting the wishbone link by its ends to the chassis frame and/or the hub carrying member. In the arrangement according to Fig. 2, on which the suspension comprises lower and upper wishbone links 10 and 11 and a coil spring disposed between the lower link 10 and a bracket 14 attached to a frame member 15, the links, each of which comprises side members 29, 30 are hinged to the frame and to a hub-carrying member 39 by hinge pins 31, 32 and 36, 37 respectively. The ends of the pins 31, 32, 36 and 37 are tapered to engage inner metal sleeves 40 of conical rubber bushes 21, the outer metal sleeves 22 of which are engaged in the links. The inner sleeves are retained in position by nuts 42 and the rubber elements 43 of the bushes which are bonded to the inner and outer sleeves, are precompressed by tie rods 24, 25, 26 and 27 respectively. A sleeve 28 is fitted around the outer tie rod 26 to increase the shear area of the connection between the side members 29, 30 of the link 10. In another arrangement, Fig. 3 (not shown), in which the outer sleeves of the bushes are pressed into housings in the side members, the bushes are retained on reduced end portions of the hinge pin against shoulders formed by such portions and the bushes are precompressed by separate tie bars connecting the side members of the links. In the arrangement according to Fig. 4 in which rubber elements 71 of opposed pairs of bushes are bonded to outer metal sleeves 73 only, the rubber elements engage directly tapered ends of a hinge pin 75 and are precompressed by a tie rod 78. The outer end of the link may be carried in ball points. A torsion bar 80 is keyed to an extension 79 of side member 76 and is anchored at its other end to the vehicle frame. In a modification, according to the first Provisional Specification, in which conical rubber bushes are located in each end of a tubular housing attached to the frame or hub-carrying member and in which the bushes are arranged with their larger ends outermost, a bolt forming a hinge-pin connects the side members of the links and serves also for precompressing the bushes. A double conical radially-split collar engages correspondingly shaped surfaces of each side member and the outer end of the inner metal sleeve of each bush. A distance tube surrounds the bolt between the inner ends of the inner sleeves of the bushes. According to this Specification also, the rubber bushes may provide the suspension element of the suspension. According to the second Provisional Specification, the rubber bushes in the construction described with reference to Fig. 4 may be located in housings on the vehicle frame and engage coned members provided on the links. Specification 590,765 is referred to.