Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shouichi Nakao0
Akira Yokoyama0
Kazuki Ido0
Date of Patent
December 15, 2009
0Patent Application Number
105861850
Date Filed
January 13, 2005
0Patent Primary Examiner
Patent abstract
Lateral cross-sections of first guiding grooves provided in the inner wall surface of an outer cup are formed in a circular arc shape for one point contact with balls, and lateral cross-sections of second guiding grooves provided in the outer wall surface of an inner ring are formed in an elliptic arc shape for two-point contact with the balls. The diameter of a ball and an offset amount between a first and a second groove is set to satisfy the expression of 0.12≦V≦0.14 with V being the ratio of the two values.
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