Abstract: Longitudinal member (10) for amphibious undercarriage, which internally defines one or more air chambers (2) for its own buoyancy and externally at least one sliding trail (4), wherein the longitudinal member (10) comprises one or more tracks (6, 6?), which develop around the sliding trail (4) and comprising chains (8, 12) flanked to each other and slidably mounted, each chain (8, 12) comprising concatenated links (14, 16), forged in one piece, fluid-powered motor means, attached to the longitudinal member (10) and configured to promote the sliding of the track (6, 6?) or plurality of tracks through the chains (8, 12). The forged links (14,16) are forged in one piece. The invention further relates to an undercarriage and an amphibious vehicle.

Abstract: Longitudinal member (10) for amphibious undercarriage, which internally defines one or more air chambers (2) for its own buoyancy and externally at least one sliding trail (4), wherein the longitudinal member (10) comprises one or more tracks (6, 6?), which develop around the sliding trail (4) and comprising chains (8, 12) flanked to each other and slidably mounted, each chain (8, 12) comprising concatenated links (14, 16), forged in one piece, fluid-powered motor means, attached to the longitudinal member (10) and configured to promote the sliding of the track (6, 6?) or plurality of tracks through the chains (8, 12). The forged links (14,16) are forged in one piece. The invention further relates to an undercarriage and an amphibious vehicle.

Abstract: A sliding roller for tracks of tracked vehicles, comprising a supporting shaft which is composed of two coaxial portions and a central collar, supporting bushings which are arranged on the coaxial portions on either side of the collar, a cylindrical shell which forms sliding surfaces for links of tracks; the shell encloses a cavity for accommodating the bushings and the shaft; the cavity is closed at opposite ends thereof by sealing devices which are arranged between the bushings and closure covers which are arranged at the opposite ends of the shaft; the collar and at least one of the bushings are locked in the cavity between an inner shoulder of the cavity and elements for axial retention of the bush which are rigidly coupled to the cylindrical shell.