Title:
WHEEL BEARING
Document Type and Number:
WIPO Patent Application WO/2010/147135
Kind Code:
A1
Abstract:
Provided is a wheel bearing that prevents balls from becoming scratched and has improved acoustic properties and an improved lifespan. In the provided wheel bearing, which is configured as a double-row angular ball bearing, a counter area (18) is formed near a groove bottom of an inner rolling surface (13a) of an inner race (13), said counter area being larger than the groove bottom diameter (d1) by a 30–90 μm clearance (2δ) for forcing the balls into position. The counter area (18) comprises a cylindrical part (18a) that extends in the axial direction from the inner rolling surface (13a), and a tapered surface (18b) where the diameter decreases from the cylindrical part (18a) towards a small end surface (13b) of the inner race (13). The join area (A) where the counter area (18) and the inner rolling surface (13a) join is rounded into a circular arc having a radius of curvature R between 2.0 and 10.0. Since the counter area and the inner rolling surface (13a) are ground by a profile grinding wheel simultaneously, as a single unit, and are smoothly connected, it is possible to prevent balls (14) from becoming deeply scratched when vibrations occur during transit, even if there is repeated contact between the join area (A) and the balls (14).
Inventors:
ARITAKE, Yasuhiro (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
有竹恭大 (〒10 静岡県磐田市東貝塚１５７８番地 ＮＴＮ株式会社内 Shizuoka, 〒4388510, JP)
有竹恭大 (〒10 静岡県磐田市東貝塚１５７８番地 ＮＴＮ株式会社内 Shizuoka, 〒4388510, JP)
Application Number:
JP2010/060178
Publication Date:
December 23, 2010
Filing Date:
June 16, 2010
Export Citation:
Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
ＮＴＮ株式会社 (〒03 大阪府大阪市西区京町堀１丁目３番１７号 Osaka, 〒5500003, JP)
ARITAKE, Yasuhiro (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
ＮＴＮ株式会社 (〒03 大阪府大阪市西区京町堀１丁目３番１７号 Osaka, 〒5500003, JP)
ARITAKE, Yasuhiro (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
International Classes:
F16C19/18; B24B19/06; B60B35/14; B60B35/18; F16C33/60; F16C33/64
Attorney, Agent or Firm:
KOSHIKAWA, Takao (19F Hamamatsu Act Tower, 111-2 Itayamachi, Naka-k, Hamamatsu-shi Shizuoka 91, 〒4308691, JP)
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