Patent GB-401143-A (GB)
Title: Improvements in or relating to vehicles rolling on tracks or rails
IPC: B61F5/38
Filed: 1933-02-06
Abstract: 401,143. Railway &c. vehicle undercarriages. BUGATTI, E., Molsheim, Bas- Rhin, France. Feb. 6, 1933, Nos. 3589 and 3590. Convention dates, Feb. 6, 1932, and Jan. 21, 1933. [Class 103 (vi).] In a railway &c. vehicle mounted upon bogies or upon sets of wheels comprising more than two axles, adjacent axles are connected together by hinged links to form parallelogram linkages which in turn are pivotally jointed to a rigid frame about vertical axes and, if desired, also about horizontal axes, so that the axles are displaceable relatively to the frame and co-operate to distribute to all the wheels any lateral force arising from track inequalities or similar causes, means being also provided to limit the extent of such displacements. A typical arrangement, in which four axles 5 are mounted in each bogie, is shown diagrammatically in Fig. 9, the vehicle underframe being supported at 2 on a rigid truck frame 1 which at its corners 3 is jointed to links 4 in turn pivotally jointed at 6 to the separate axles. With this construction, if any lateral displacement a is given, say, to the leading axle, a swivelling movement of the rigid frame 1 about the king-pin 2 occurs combined with a lateral displacement of the king-pin equal to one-fourth of the displacement a. The various joints 2, 3, 6 may be of such a nature as also to permit movements of the links about horizontal axes and thereby to lessen shocks due to vertical displacements of one or more of the wheels. Other constructions are described in which the number of axles to each bogie is three five, six or eight, while in a further modification, Fig. 19 (not shown), the bogie comprises a central axle associated with a pair of two-axle sub-trucks. The underframe may be spring-supported on the truck frames in any usual manner, or instead, the longitudinal links and side-members of the truck frame may be formed by leaf springs. A complete bogie corresponding to the axle arrangement illustrated in Fig. 9 is shown in Figs. 24, 25 and 27. The underframe is fitted centrally with a king-pin 42 having a spherical head 43 engaging a block 44 slidable in a sleeve 45, which in turn is supported in the truck frame 49, at its lower end in a spherical socket 48 and at its upper end in a rubber ring 50. The side-bearings comprise underframe brackets 70 and straps 72 embracing leaf springs 74 that constitute the side members of the truck frame, the elements 70, 72 being constructed to allow the springs 74 to pivot both laterally and in a vertical plane, while the ends of the springs are jointed to caps 84, Figs. 27, resting on the truck cross-members 49 through the intermediary or rubber seats 85. Leaf-springs 60, 61 jointed to pairs of axles 67 through rubber sleeves 66 and plates 68, have freedom of movement at their centres where they pass through and are jointed to a housing 54 forming part of the truck cross-member 49. No relative lateral movement is permitted between the springs 60, 61 and the axles, while the lateral movement of the latter relative to the truck frame is limited bv transverse rods 88 or by co-operating forks and stops on the truck and axles. In n.ost of the constructions described the longitudinal links and frame members act as equalizers for the loads on the axles.