Provided is a railway vehicle bearing abnormality sensing system that can accurately perform abnormality determination for railway vehicle bearings. The system (100) senses an abnormality in a plurality of rolling bearings (17) housed in an axle box (3) provided to a bogie (2). The system (100) includes: vibration detection devices (15) each detecting vibration of a rolling bearing; an analysis device (6) determining an abnormality in the bearings (17) on the basis of detection data detected by the device (15); and reception response detection start module (13) receiving a detection start signal and cause the device (15) to detect vibration of the rolling bearing. The system (100) further includes a measurement start command transmitting device (4), installed apart from a railway vehicle, transmitting the detection start signal to the module (13).

Provided is a railway vehicle bearing abnormality sensing system that can accurately perform abnormality determination for railway vehicle bearings. The system (100) senses an abnormality in a plurality of rolling bearings (17) housed in an axle box (3) provided to a bogie (2). The system (100) includes: vibration detection devices (15) each detecting vibration of a rolling bearing; an analysis device (6) determining an abnormality in the bearings (17) on the basis of detection data detected by the device (15); and reception response detection start module (13) receiving a detection start signal and cause the device (15) to detect vibration of the rolling bearing. The system (100) further includes a measurement start command transmitting device (4), installed apart from a railway vehicle, transmitting the detection start signal to the module (13).

A bearing device for an axle has: a first axial gap (G1), which is defined between the inner ring (3) and the back cover (11) in an axial direction, and has the spacer (21) interposed therein; a second axial gap (G2), which is larger than the first axial gap (G1), and has the sealing member (22) interposed therein; and a third axial gap (G3), which is defined on a radially outer side of the second axial gap (G2), and is smaller than the second axial gap (G2).

A bearing device for an axle has: a first axial gap (G1), which is defined between the inner ring (3) and the back cover (11) in an axial direction, and has the spacer (21) interposed therein; a second axial gap (G2), which is larger than the first axial gap (G1), and has the sealing member (22) interposed therein; and a third axial gap (G3), which is defined on a radially outer side of the second axial gap (G2), and is smaller than the second axial gap (G2).

A roller bearing unit for rail vehicles, having an inner bearing ring, an outer bearing ring, rolling elements arranged between the bearing rings, and at least one retainer element. The inner bearing ring and the retainer element are configured to be arranged on an axle. The retainer element is arranged radially between an axial end of the inner bearing ring and the axle, and radially between a contact part lying against the end face of the inner bearing ring, and the axle. The retainer element has at least one sealing element sealing the inner bearing ring.

A roller bearing unit for rail vehicles, having an inner bearing ring, an outer bearing ring, rolling elements arranged between the bearing rings, and at least one retainer element. The inner bearing ring and the retainer element are configured to be arranged on an axle. The retainer element is arranged radially between an axial end of the inner bearing ring and the axle, and radially between a contact part lying against the end face of the inner bearing ring, and the axle. The retainer element has at least one sealing element sealing the inner bearing ring.

A railway vehicle and an axle box structure thereof are provided. The axle box structure includes an axle box body and a positioning node mounting seat. The axle box body includes an upper box body and a lower box body. The upper box body and the lower box body enclose a bearing mounting chamber together. A lower end surface of the upper box body has a convex portion, and an upper end surface of the lower box body has a concave portion. A first semi-circular hole and a second semi-circular hole are respectively provided at the middle of the upper box body and the lower box body. If the convex portion and the concave portion are assembled in a sealed coupling manner, the bearing mounting chamber is formed by the first semi-circular hole and the second semi-circular hole.

A railway vehicle and an axle box structure thereof are provided. The axle box structure includes an axle box body and a positioning node mounting seat. The axle box body includes an upper box body and a lower box body. The upper box body and the lower box body enclose a bearing mounting chamber together. A lower end surface of the upper box body has a convex portion, and an upper end surface of the lower box body has a concave portion. A first semi-circular hole and a second semi-circular hole are respectively provided at the middle of the upper box body and the lower box body. If the convex portion and the concave portion are assembled in a sealed coupling manner, the bearing mounting chamber is formed by the first semi-circular hole and the second semi-circular hole.

An axlebox for a railway vehicle, having a housing provided with a through bore extending along a central axis, a bearing unit housed in the bore, and a back cover. The back cover and housing are fixed together by special manufactured shapes so as to minimize spare parts.

A roller bearing unit for rail vehicles, having an inner bearing ring, an outer bearing ring, rolling elements arranged between the bearing rings, and at least one retainer element. The inner bearing ring and the retainer element are configured to be arranged on an axle. The retainer element is arranged radially between an axial end of the inner bearing ring and the axle, and radially between a contact part lying against the end face of the inner bearing ring, and the axle. The retainer element has at least one sealing element sealing the inner bearing ring.