Patent ID: 9463814
Filing Date: 2016-10-11
CPC Classification: B61F,F16C

Claim Text:
1. 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; and an outer-ring-side sealing member mounted to the outer ring, wherein an opening portion between the inner ring and the outer ring is sealed only by a labyrinth seal comprising an axial labyrinth extending in an axial direction and a radial labyrinth extending in a radial direction, wherein the outer-ring-side sealing member comprises a seal extended portion extending in the axial direction toward an end surface of the inner ring, and forms the labyrinth seal, wherein the axial labyrinth comprises a first axial labyrinth formed by an outer peripheral surface of the seal extended portion and a second axial labyrinth formed by an inner peripheral surface of the seal extended portion, the inner peripheral surface of the seal extended portion being a straight cylindrical surface, and wherein a radial dimension of the second axial labyrinth is larger than a radial dimension of the first axial labyrinth.