| 摘要 |
PURPOSE:To provide a simple and inexpensive shielding method which is suitable for minor production, by a method wherein a flat annular shield plate is fitted in a seal groove formed in an outer ring or an inner ring, and the edge of the shield plate is expanded by a punching process to engage such expanded part with the seal groove. CONSTITUTION:A seal groove, which is annular and concentric with an outer ring 11 and is axially sized to be slightly thicker than the thickness of a shield plate 14, is formed in each of the inner diameter parts, at both ends in the direction of an axis of the outer ring 11. In the seal groove 19, its inner wall surface in the direction of an axis forms a positioning wall 15, an annular recess 17 is formed in the middle of an inner surface part 16 of a cylinder, by which the positioning wall is followed, and the outer surface of the annular recess part 17 forms, in order, a slanted side 17a and an annular locking surface part 18. Mounting of the shield plate 14 is such that the edge part of the outer surface of the shield plate 14 is stamped by a punch 20 to form an expansion part 14a, and the forward end, serving as a lock starting point 14b, is stuck to the slanted face side 17a. The inner periphery of the shield plate 14 is positioned opposite to a cylinder part 21 of an inner ring 10 with labyrinth gap formed therebetween. |
