Abstract: A rolling-stock bogie frame has a ladder-shaped frame structure comprising side beams and cross beams, each of which has a trough-shaped part with an open upper part and a reinforcing member secured to the trough-shaped part to cover and close the open upper part thereby to form a closed box beam with a utilizable hollow interior. Each of the trough-shaped part and reinforcing member comprises spaced apart inner and outer sheathings of fiber-reinforced plastic material and honey-comb members inserted between and bonded to the inner and outer sheathings. The bogie frame affords high strength with low weight. The hollow interior of the beam provides an equipment space for accommodating an air reservoir and piping for the pneumatic and hydraulic systems.

Abstract: A bogie frame for a railway vehicle has a pair of side beams made of fiber reinforced plastic material with a box-shaped cross section. A pair of cylindrical horizontal beams span between the paired side beams are formed of a fiber reinforced plastic material. A honeycomb core is filled up in an inner hollow portion of each of the side beams. A reinforcing member is further filled up in the honeycomb core. The coupling comprises a taper pad mounted to end portions of the horizontal beam and the taper sleeve. The taper pad is provided with tapering portions at its ends downwardly tapering from a central portion. The taper sleeve is fitted into a gap between an outer periphery of the tapering portion of the taper pad and an inner periphery of the hole of the side beam.