Title:
DEEP GROOVE BALL BEARING
Document Type and Number:
WIPO Patent Application WO/2011/155456
Kind Code:
A1
Abstract:
Provided is a deep groove ball bearing such that balls can be completely prevented from riding inner and outer race shoulders, and that the rolling fatigue life is long. Balls (31) are installed between a raceway groove (12) of an outer race (11) and a raceway groove (22) of an inner race (21). The balls (31) are retained in a cage (40). A total of four shoulders are formed on both sides of the outer raceway groove (12) and the inner raceway groove (22). As regards these four shoulders, the heights of a pair of shoulders (13a, 23b), which are located diagonally, are set to be higher than those of the remaining pair of shoulders (13b, 23a). The height of the higher shoulder (13a) of the outer race (11) is denoted by H1, the height of the higher shoulder (23b) of the inner race (21) is denoted by H2, and the diameter of the balls (31) is denoted by d. On the basis of these notations, a ratio H1/d, which is the ratio of the shoulder height (H1) of the outer race (11) to the diameter (d) of the balls (31), is set to be within a range of 0.28 - 0.50. Furthermore, a ratio H2/d, which is the ratio of the shoulder height (H2) of the inner race (21) to the diameter (d) of the balls (31), is set to be within a range of 0.37 - 0.50. As a result, the balls (31) are prevented from riding inner and outer race shoulders. Bearing steel which is the raw material for the outer race (11) and the inner race (21), is heat treated, resulting in the rolling fatigue life being improved.
Inventors:
UENO TAKASHI (JP)
Application Number:
PCT/JP2011/062959
Publication Date:
December 15, 2011
Filing Date:
June 06, 2011
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
UENO TAKASHI (JP)
UENO TAKASHI (JP)
International Classes:
F16C19/06; F16C33/38; F16C33/58; F16C33/64
Foreign References:
| JP2000145795A | 2000-05-26 | |||
| JPH09264321A | 1997-10-07 | |||
| JP2007155022A | 2007-06-21 | |||
| JP2010112461A | 2010-05-20 |
Attorney, Agent or Firm:
KAMADA Bunji et al. (JP)
Bunji Kamata (JP)
Bunji Kamata (JP)
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