| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling bearing device for a wheel capable of preventing the scattering and the fall of abrasion powdery dust and a burr debris to the installation surface of an installation board for a press-in device when pressing a serration shaft of a hub bolt into a bolt hole of a flange. SOLUTION: In the vehicular rolling bearing device, a bolt hole 60 is formed at a flange 22 of a hub wheel 20 having a hub shaft 21 assembled with a rolling bearing 31. A shaft 72 of the hub bolt 70 for fixing a wheel is press-fitted into the bolt hole 60. At the shaft 72 of the hub bolt 70, there are formed a serrated shaft 73, an intermediate shaft 76 and a male screw 77 are formed in this order toward the tip from the root side. The serrated shaft 73 is bitten into the male screw 77 and press-inserted therein. At the opening internal periphery of the press-insertion outlet side of the bolt hole 60, there is formed an annular protrusion 62 which reduces the diameter of the bolt hole 60, and closed the bolt hole 60 while contacting with or approximating to the intermediate shaft 76. COPYRIGHT: (C)2008,JPO&INPIT
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