Title:
BEARING DEVICE FOR WHEEL AND METHOD OF MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2012/128278
Kind Code:
A1
Abstract:
[Problem] To provide a bearing device for a wheel and a method of manufacturing same, such that costs are reduced by minimizing the cutting allowance, strength at high load portions is increased, and the contradicting problems of achieving lighter weight and achieving high rigidness are solved to extend the life of the bearing.
[Solution] A hub wheel (4) is formed by a hot forging step and a cold forging step which is partially applied after the hot forging step such that there is a predetermined hardness difference or greater for the surface hardness. A wheel attachment flange (6) is configured from a plurality of partial flanges (6a), which are divided in the circumferential direction. A pilot part (12) is provided with cutouts at multiple locations in the circumferential direction thereof and formed into a shape of intermittent projections by hot forging. This pilot part (12) is disposed between the partial flanges (6a), and the base portion of the wheel attachment flange (6) is formed to be thicker than the leading end parts thereof in the hot forging step, then made thinner by the cold forging step such that thickness is substantially uniform.
Inventors:
NORIMATSU TAKAYUKI (JP)
UMEKIDA MITSURU (JP)
KOMORI KAZUO (JP)
UMEKIDA MITSURU (JP)
KOMORI KAZUO (JP)
Application Number:
PCT/JP2012/057139
Publication Date:
September 27, 2012
Filing Date:
March 21, 2012
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
NORIMATSU TAKAYUKI (JP)
UMEKIDA MITSURU (JP)
KOMORI KAZUO (JP)
NORIMATSU TAKAYUKI (JP)
UMEKIDA MITSURU (JP)
KOMORI KAZUO (JP)
International Classes:
B60B35/02; B21K1/40
Foreign References:
| JP2005337311A | 2005-12-08 | |||
| JP2006142916A | 2006-06-08 | |||
| JP2005314756A | 2005-11-10 | |||
| JP2010096253A | 2010-04-30 | |||
| JP2010241188A | 2010-10-28 | |||
| JP2010151277A | 2010-07-08 | |||
| JP2007023321A | 2007-02-01 | |||
| JP2005232581A | 2005-09-02 | |||
| JP2008194741A | 2008-08-28 | |||
| JP2006111070A | 2006-04-27 |
Attorney, Agent or Firm:
KOSHIKAWA, TAKAO (JP)
Takao Koshikawa (JP)
Takao Koshikawa (JP)
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Claims: