To provide a wheel bearing device which can lower a torque of the wheel bearing device while suppressing the occurrence of raceway surface exfoliation.SOLUTION: A wheel bearing device 1 comprises: an outer ring 2 having outside raceway surfaces 2c, 2d on an internal periphery; an inner member having inside raceway surfaces 3c, 4a; ball rows 5, 6 accommodated between the raceway surfaces of the outer ring 2 and the inner member; an inner-side seal member 10 and an outer-side seal member 20 for closing open ends of an annular space 15 which is formed of the outer ring 2 and the inner member; a first grease G1 applied in the annular space 15; and a second grease G2 applied in a space surrounded by the inner-side seal member 10 and the outer-side seal member 20 and by a hub ring 3. A dynamic viscosity of a second base oil contained in the second grease G2 is lower than that of a first base oil contained in the first grease G1. The dynamic viscosity of the first base oil is 20 to 65 mm2/s(40°C), and the dynamic viscosity of the second base oil is 10 to 35 mm2/s(40°C).SELECTED DRAWING: Figure 1
【課題】軌道面剥離の発生を抑制しながら、車輪用軸受装置のさらなる低トルク化を図ることができる車輪用軸受装置を提供する。【解決手段】内周に外側軌道面2c、2dを有する外輪2と、内側軌道面3c、4aを有する内方部材と、外輪2と内方部材の両軌道面間に収容されたボール列5、6と、外輪2と内方部材によって形成された環状空間15の開口端を塞ぐインナー側シール部材10およびアウター側シール部材20と、環状空間15内に塗布される第1グリースG1と、インナー側シール部材10内およびアウター側シール部材20とハブ輪3とで囲まれた空間内に塗布される第2グリースG2とを備える車輪用軸受装置1であって、第2グリースG2が含有する第2基油の動粘度が、第1グリースG1が含有する第1基油の動粘度よりも小さく、第1基油の動粘度は20~65mm2/s(40℃)であり、第2基油の動粘度は10~35mm2/s(40℃)である。【選択図】図1
WHEEL BEARING DEVICE
車輪用軸受装置
2023-09-22
Patent
Electronic Resource
Japanese