PROBLEM TO BE SOLVED: To provide a wheel bearing device for preventing drilling mud from immersing into a bearing from outside to keep a high tight sealing performance and applying a low torque formation.SOLUTION: A dust cover 12 is installed at an end part of an outer member 10, the dust cover 12 comprises a fitting part 25a press fitted to the outer member, a disc-like shielding part 25b extending in a radial inward direction through a diameter reduced part 25b, a core 25 provided with a cylindrical bent part 25d and a synthetic rubber elastic member 26 integrally connected to the core. A dust lip 27a connected to an inner edge part of the core 25 to enter it is formed at a base part 27 of the elastic member 26 to extend while being inclined in a radial inner direction, a circular ring 29 is slidably contacted with a large end surface 3b of an inner ring 3 through an axial fastening margin and at the same time the circular ring formed into a sectional U-shape is fitted to a shoulder part 19 of an outer joint member 14, and an inner peripheral surface of this circular ring 29 is oppositely arranged against the base part 27 of the elastic member 26 to form a labyrinth seal.SELECTED DRAWING: Figure 2
【課題】外部から泥水等が軸受内に浸入するのを防止して高い密封性能を維持させると共に、低トルク化を図った車輪用軸受装置を提供する。【解決手段】外方部材10の端部にダストカバー12が装着され、このダストカバー12が、前記外方部材に圧入される嵌合部25aと、縮径部25bを介して径方向内方に延びる円板状の遮蔽部25bと、円筒状の屈曲部25dを備えた芯金25と、これに一体に接合された合成ゴム製の弾性部材26からなり、芯金25の内縁部に回り込むように接合され、この弾性部材26の基部27に径方向内方に傾斜して延びるダストリップ27aが形成され、内輪3の大端面3bに軸方向シメシロを介して摺接されると共に、外側継手部材14の肩部19に断面コの字状に形成された円環29が嵌合され、この円環29の内周面が弾性部材26の基部27に対向配置され、ラビリンスシールが形成されている。【選択図】図2
WHEEL BEARING DEVICE
車輪用軸受装置
2017-03-16
Patent
Electronic Resource
Japanese