GB400822A - Damping device for steadying the running of railway vehicle trucks - Google Patents

Abstract

400,822. Railway-vehicle undercarriages ; dashpots. KRUCKENBERG, F. and STEDEFELD, C., 16B, Ellernstrasse, Hanover, Germany. Feb. 9, 1933, No. 4020. Convention date, Feb. 10, 1932. [Classes 103 (vi) and 108 (iii).] In order to prevent swaying of a railway vehicle body owing to pivotal movements of the trucks relative thereto, these pivotal movements are damped by the provision of liquid damping means between the body and trucks. In a simple arrangement, as shown in Figs. 2 and 3, the damping device comprises a piston 28 connected by piston rod 30 and pivoted link 31 to the vehicle body and movable in a liquid-containing casing 27 so as to displace liquid through a valved passage 34 from one chamber 32 to the other chamber 33. In the case of excessive shocks inwardly and outwardly opening valves 36, 38, 39, 40 loaded to a predetermined degree permit a relief flow through passage 37. When the vehicle is negotiating a curve and the piston 28 is displaced to one side of its central position, the desired relatively free pivotal movement of the trucks under these circumstances is attained by providing the walls of the casing 27 with additional channels 51, 52 for the flow of liquids. In place of the relief valve 36, 38, 39, 40 the rod 31 may be connected to the vehicle body through the medium of strong springs which yield only under excessive shocks. In the case of vehicles in which the body pivot 26 is permitted a lateral movement within the truck frame, the two chambers. 32, 33, Fig. 6, are preferably arranged in longitudinal alignment with a common pistonrod 30, an eye 54 on which is engaged by a swinging link 55 on the vehicle body. Lateral movements of the body on the truck cause no displacement of the rod 30, while pivotal movements bring the damping device into operation. Other modifications, such as that shown in Figs. 10 and 12, are described, in which the truck is pivotally connected to the body by a pair of parallel hinged rods 62, 63 and a two-armed lever 59, an extension 69 of which is either associated with a lateral damping-device of the kind shown in Fig. 6 or with an end dashpot 70 as shown in Fig. 10. In the latter construction, the extension 69 has a sliding and pivotal connection 84 with a short arm 81 secured to a rotatable shaft 74 carrying the movable vane 78 of a rotary wing damping device. The latter is provided with a valve passage 34, and relief channels 51, 52 as in the construction shown in Fig. 3.