To realize a structure of a hub unit bearing which can achieve low torque and prevent occurrence of a crack of a relief groove.SOLUTION: A hub ring 8 has: a large flange part 16 protruding from a portion located adjacent to the axial outer side of an inner ring raceway 10a of an axial outer row to the radial outer side; a relief groove 17 which connects an axial inner surface 16a of the large flange part 16 with the inner ring raceway 10a of the axial outer row and has a cross section having a recessed arc shape; a heat treatment hardening layer 25 formed in a range, which includes at least the inner ring raceway 10a of the axial outer row and the large flange part 16, of an outer peripheral surface; and recessed parts 19 which are recessed from an axial outer surface to the axial inner side and disposed at an equal interval in a circumferential direction. At least a part of a radial outer part of the recessed part 19 is located near the relief groove 17.SELECTED DRAWING: Figure 1

    【課題】低トルク化と、逃げ溝の亀裂の発生防止との両立を図れる、ハブユニット軸受の構造を実現する。【解決手段】ハブ輪8を、軸方向外側列の内輪軌道10aの軸方向外側に隣接した部分から径方向外側に向けて突出した大鍔部16と、大鍔部16の軸方向内側面16aと軸方向外側列の内輪軌道10aとを接続する凹円弧状の断面形状を有する逃げ溝17と、外周面のうちで少なくとも軸方向外側列の内輪軌道10a及び大鍔部16を含む範囲に形成された熱処理硬化層25と、軸方向外側面から軸方向内側に向けて凹み、円周方向に関して等間隔に配置された凹部19とを有するものとし、凹部19の径方向外側部の少なくとも一部分を、逃げ溝17の近傍に位置させる。【選択図】図1


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    Title :

    HUB UNIT BEARING AND MANUFACTURING METHOD OF THE SAME


    Additional title:

    ハブユニット軸受及びその製造方法


    Contributors:

    Publication date :

    2024-01-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60B VEHICLE WHEELS , Räder für Fahrzeuge / F16C SHAFTS , Wellen



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