Title:
BALL BEARING AND BALL BEARING MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2016/140279
Kind Code:
A1
Abstract:
A ball bearing is provided which, during high loads, does not have sites where the surface pressure on a holding body becomes locally high, thereby suppressing cracking and thus increasing service life. This ball bearing is provided with a pair of holding bodies (12, 14) and with at least one rolling body (16) movably held between the pair of holding bodies. In each of the pair of holding bodies, the cross-section profile line (14a) of the portion contacting the rolling body has the smallest radius of curvature at a position (P) which protrudes farthest in a first direction (D1), which is the direction in which the pair of holding bodies are opposite from each other. The radius of curvature of the cross-section profile line becomes larger farther away from the position (P) in the second direction (D2), which is perpendicular to the first direction (D1) in the cross-section. The cross-section profile line consists of a single function. Setting the origin as the midpoint of the profile line in the second direction, and setting the X axis as the axis that extends in the second direction and the Y axis as the axis that extends in the first direction, and defining (R) as the radius of the rolling bodies, the profile cross-section profile line satisfies expression (1). X2/{2R(1+0.05)} < Y < X2 / {2R (1-0.05)}... (1)
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Inventors:
FUJITA TAKASHI (JP)
NEISHI YUTAKA (JP)
NARUMIYA HIROKI (JP)
NEISHI YUTAKA (JP)
NARUMIYA HIROKI (JP)
Application Number:
PCT/JP2016/056470
Publication Date:
September 09, 2016
Filing Date:
March 02, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
F16C33/64; F16C19/06; F16C19/10
Foreign References:
| JP2005331099A | 2005-12-02 | |||
| JP2002005178A | 2002-01-09 | |||
| JPH09119510A | 1997-05-06 | |||
| JPS407608B1 | 1965-04-17 |
Other References:
See also references of EP 3267058A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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