| 摘要 |
PROBLEM TO BE SOLVED: To prevent degradation of the lubricant such as grease and oil, and to increase the service life of a bearing by suppressing generation of fretting wear powder between a flange end face 8 of an axle bearing device and a contact surface 10 of a rear lid 3. SOLUTION: The diameter of the contact surface 10 with the flange end face 8 of an inner ring 4a of the bearing 1 in contact with the rear lid 3 provided on an axle side and the rear lid 3 is set to be not smaller than the inside diameter 21 of the inner ring of the bearing to not greater than 1.2 times the inside diameter of the inner ring. A small space 11 in the radial direction is provided outside the contact surface 10, and an elastic sealing member 12 is held adjacent to the outside of the contact surface. Alternatively, an annular groove 14 is provided adjacent to the outside of the contact surface. |
