Title:
BEARING DEVICE FOR VEHICLE WHEEL
Document Type and Number:
WIPO Patent Application WO/2024/019009
Kind Code:
A1
Abstract:
A bearing device 1 for a vehicle wheel comprises: an outer member (outer ring 2) having a double row of outer raceway surfaces 2c, 2d on the inner circumference; inner members (hub ring 3 and inner ring 4) having a double row of inner raceway surfaces 3d, 4a facing the double row of the outer raceway surfaces 2c, 2d on the outer circumference; and a plurality of tapered rollers 51 accommodated so as to freely roll between the outer raceway surfaces 2c, 2d and the inner raceway surfaces 3d, 4a, the inner raceway surfaces 3d, 4a being integrally formed with large flange sections 3e, 4b that come into sliding contact with large-diameter-side end surfaces 51a of the tapered rollers 51, wherein the large flange sections 3e, 4b have an arithmetic mean roughness Ra of 0.08 μm or less, and a base oil of grease to be filled in the space surrounding the tapered rollers 51 has a kinematic viscosity at 40°C of 40 to 80 mm2/s.
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Inventors:
MATSUSHITA TOMOKI (JP)
Application Number:
PCT/JP2023/026046
Publication Date:
January 25, 2024
Filing Date:
July 14, 2023
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
F16C33/66; C10M115/08; C10M169/02; F16C19/38; F16C33/58; C10N30/00; C10N40/02; C10N50/10
Foreign References:
| JP2008051165A | 2008-03-06 | |||
| JP2018165552A | 2018-10-25 | |||
| JP2021046915A | 2021-03-25 | |||
| JP2020083994A | 2020-06-04 | |||
| JP2021063521A | 2021-04-22 |
Attorney, Agent or Firm:
YANO INTERNATIONAL PATENT ATTORNEYS OFFICE, P.C. (JP)
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