| 摘要 |
PROBLEM TO BE SOLVED: To prevent extrusion of adhesive by vertically dividing a fitting surface of bearing members of a bearing holding member into two parts, and forming a space enclosed between each bearing holding member and a bearing member as a reserving part of the adhesive. SOLUTION: Adhesive 4 is coated in an annular groove 1a of a radial bearing 1 or in the vicinity of the annular groove 1a, and is softly pressed from an upper end surface 2b side into a center hole 2e of a disk hub A2. The adhesive 4 is extruded and remained to a corner where a recessed surface 2c and an outer peripheral surface are brought into contact with each other, and is not extruded to a lower end surface 1c side. When a center hole 3a of a disk hub B3 is softly pressed in an outer periphery of the bearing 1, the inner diameter 3d of the lower recessed hole of the hub B3 is fitted at a sufficient clearance with an outer diameter of a small diameter cylindrical part 2a of the hub A2, the adhesive 4 is pushed down along an outer wall of the bearing 1 on a recessed surface 3c, and is housed in the space C, and is not extruded to an upper end surface 1b. The hub B3 is covered in the hub A2, and air closed between them is released to outside air by passing a fitting clearance between both members and a groove part.
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