PROBLEM TO BE SOLVED: To obtain a structure which can suppress the rotation imbalance of a hub having a rotation-side flange even if through-holes are formed in a plurality of points having unequal intervals with respect to a circumferential direction in the rotation-side flange, and the structure which allows the moment rigidity of the rotation-side flange to approach uniformly over the entire circumference.SOLUTION: Volumes of first ribs 20a, 20a near through-holes 19a, 19a out of ribs 20a, 20b which are formed in a plurality of points in a circumferential direction at an inside face of a rotation-side flange 11a in an axial direction are set larger than volumes of second ribs 20b, 20b which are apart from the through-holes 19a, 19a.SELECTED DRAWING: Figure 2
【課題】回転側フランジのうち円周方向に関して不等間隔となる複数箇所に透孔を設ける場合でも、前記回転側フランジを有するハブの回転アンバランスを抑える事ができると共に、この回転側フランジのモーメント剛性を全周に亙り均一に近づける事ができる構造を実現する。【解決手段】回転側フランジ11aの軸方向内側面の円周方向複数箇所に設けるリブ20a、20bのうち、透孔19a、19aに近い第1リブ20a、20aの体積を、同じく透孔19a、19aから遠い第2リブ20b、20bの体積よりも大きくする。【選択図】図2
WHEEL SUPPORT ROLLING BEARING UNIT
車輪支持用転がり軸受ユニット
2018-03-08
Patent
Elektronische Ressource
Japanisch