To provide a bearing unit which maintains sealability by an O ring disposed in a butted area between an inner side end part of an outer ring and a cover member to effectively prevent entry of foreign objects, such as water and slurry, into a bearing.SOLUTION: A bearing unit for supporting a wheel includes: an outer ring 1 connected to the vehicle body side; a hub ring 19 which is disposed so as to rotate relatively to the outer ring 1; rolling elements 29 incorporated between the outer ring 1 and the hub ring 19; and a cover member 43 which is fitted in an inner side end part of the outer ring 1 to make a seal. The bearing unit has a butted area 65 where the inner side end surface of the outer ring 1 and an outer side surface of the cover member 43 are butted in an axial direction. A small diameter step part 71 of the inner side end part of the outer ring 1 and an eaves part 77 of the cover member 43 are located so as to overlap with each other in a radial direction at the outer diameter side of the butted area 65.SELECTED DRAWING: Figure 3
【課題】外輪のインナ側端部とカバー部材との突き合わせ領域に配設されたOリングによる密封性を維持して、軸受内部への水・泥水などの異物の浸入を有効に防止し得る軸受ユニットを提供する。【解決手段】車体側と連結される外輪1と、外輪1と相対回転可能に配されるハブ輪19と、外輪1とハブ輪19との間に組み込まれる転動体29と、外輪1のインナ側端部に嵌合されて密閉するカバー部材43とを備えている。外輪1のインナ側端面とカバー部材43のアウタ側面とが、軸方向で突き合わされる突き合わせ領域65を有し、外輪1のインナ側端部の小径段部71とカバー部材43の庇部77とが、突き合わせ領域65の外径側にて径方向で重なり合うように位置している。【選択図】図3
BEARING UNIT FOR SUPPORTING WHEEL
車輪支持用軸受ユニット
2019-03-28
Patent
Electronic Resource
Japanese