PROBLEM TO BE SOLVED: To materialize structure which can effectively prevent formation of an impression on a raceway surface caused by an impact load which is applied to a rotation-side flange of a hub main body upon the running of a vehicle.SOLUTION: An outside inner ring raceway surface 8 and an inside inner ring raceway surface 11 are formed into true round shapes, and balls 4 being rolling elements are formed into true spherical shapes having equal ball diameters. An outside outer ring raceway surface 14a and an inside outer ring raceway surface 15a are formed into elliptical shapes having major axes in a vertical direction on which loads act in use states, and have apexes 20 at upper end parts and lower end parts.SELECTED DRAWING: Figure 1
【課題】車両走行時に、ハブ本体の回転側フランジに加わる衝撃荷重に基づいて、軌道面に圧痕が形成される事を有効に防止できる構造を実現する。【解決手段】外側内輪軌道面8及び内側内輪軌道面11は、真円形状に形成され、転動体である各玉4は、玉径が等しい真球形状に形成される。外側外輪軌道面14a及び内側外輪軌道面15aは、使用状態で荷重が作用する上下方向に長軸を有する楕円形状であり、上端部及び下端部にそれぞれ頂点20を有している。【選択図】図1
WHEEL SUPPORT ROLLING BEARING UNIT
車輪支持用転がり軸受ユニット
2017-06-08
Patent
Electronic Resource
Japanese