Patent ID: 8790014

Claim:
An axle bearing device for a railway vehicle, the axle bearing device comprising: an inner ring to be fixed to an axle of the railway vehicle; an outer ring to be fixed to a journal box of the railway vehicle; double row rolling elements arranged between raceway surfaces of the inner ring and raceway surfaces of the outer ring; a lid member arranged on an axial end portion side of the inner ring; and a branch portion forming member arranged between the inner ring and the lid member, wherein an opening portion between the inner ring and the outer ring is sealed by a labyrinth seal comprising at least one axial labyrinth and at least one radial labyrinth, and wherein at least one of the at least one axial labyrinth and the at least one radial labyrinth which form the labyrinth seal is formed between the inner ring and an outer-ring-side sealing member mounted to the outer ring, or between the outer-ring-side sealing member mounted to the outer ring and an inner-ring-side sealing member mounted to the inner ring, and wherein a branch portion is formed between the lid member and the branch portion forming member, the branch portion extending in a direction different from a direction along which a path of the labyrinth seal extends, and one end of the branch portion in a longitudinal direction opens to the path of the labyrinth seal.