Title:
VEHICLE WHEEL BEARING DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/171319
Kind Code:
A1
Abstract:
Provided is a vehicle wheel bearing device with which it is possible to further reduce torque in the vehicle wheel bearing device while inhibiting the occurrence of raceway surface flaking. Provided is a vehicle wheel bearing device 1 comprising: an outer ring 2 that has outside raceway surfaces 2c, 2d on the inner circumference thereof; an inner member that has 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 sealing member 10 and an outer side sealing member 20 that respectively seal open edges of an annular space 15 formed by the outer ring 2 and the inner member; a first grease G1 that is applied in the annular space 15; and a second grease G2 that is applied inside of the inner side sealing member 10 and in a space surrounded by the outer side sealing member 20 and a hub ring 3, wherein the kinematic viscosity of a second base oil contained in the second grease G2 is less than the kinematic viscosity of a first base oil contained in the first grease G1, and the kinematic viscosity of the first base oil is 20-65 mm2/s (40°C) and the kinematic viscosity of the second base oil is 10-35 mm2/s (40°C).
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Inventors:
NAKATSUJI YUTA (JP)
SEKI MAKOTO (JP)
SEKI MAKOTO (JP)
Application Number:
PCT/JP2023/005712
Publication Date:
September 14, 2023
Filing Date:
February 17, 2023
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
C10M171/02; B60B35/02; F16C19/18; F16C33/66; F16C33/78
Foreign References:
| JP2015075180A | 2015-04-20 | |||
| JP2014029198A | 2014-02-13 |
Attorney, Agent or Firm:
YANO INTERNATIONAL PATENT ATTORNEYS OFFICE, P.C. (JP)
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