One object of the present invention is to provide a wheel bearing apparatus which can reduce the frictional torque of the sealing lips and thus reduce the rotational torque of the sealing apparatus with selecting best characteristics and combinations of both the bearing grease and the sealing grease which can prevent mixture of them by suppressing their flowability. According to the present invention there is provided a wheel bearing apparatus for a vehicle comprising an outer member; an inner member including a hub wheel and at least one inner ring; double row rolling elements freely rollably contained between the inner raceway surfaces of the inner member and the outer raceway surfaces of the outer member; and seals mounted within annular openings formed between the outer member and the inner member characterized in that at least one seal of the seals comprises a core metal press-formed of steel sheet including a cylindrical fitting portion adapted to be press-fitted into the inner circumference of the end of the outer member via a predetermined interference and a radial portion extending radially inward from the end of the fitting portion, and further comprises a sealing member of synthetic rubber formed with a plurality of sealing lips and integrally adhered to the fitting portion of the core metal by vulcanizing adhesion; that bearing grease is contained within the bearing in a sealed manner and sealing grease is applied to the sliding portions of the sealing lips; that both the bearing grease and the sealing grease use same thickener and the worked penetration of 350 or less; and that the kinematic viscosity of base oil of the sealing grease at 40°C is set to 70% or less of that of the bearing grease at 40°C.
WHEEL BEARING DEVICE
RADLAGERVORRICHTUNG
DISPOSITIF DE ROULEMENT DE MOYEU
2018-11-21
Patent
Elektronische Ressource
Englisch
Europäisches Patentamt | 2017
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