Outer ring, drawn cup needle roller bearing, drawn cup...

Bearings – Rotary bearing – Antifriction bearing

Reexamination Certificate

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Reexamination Certificate

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07665899

ABSTRACT:
The straightness and parallelism of a track surface on which rollers roll are measured within a range “L2” as a range for measuring the straightness and parallelism. The range “L2” is a range such that L2≧0.8×L when a roller length is “L”. When the dimension from the corner P of the flange on the inner diameter side to the starting point of the range “L2” is “L1”, the dimension “L1” is ranged such that 0.8 mm≦L1≦2 mm. In this range, the straightness of the track surface of the outer ring in the axial direction is not more than 0.008 mm and the parallelism thereof is not more than 0.015 mm.

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K. Rennels, “Current Methodologies for Geometric Dimensioning and Tolerancing” Proceedings Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference, Indianapolis, Sep. 23-25, 2003, pp. 565-570.
R. Thalmann, “Intercomparison of parallelism measurements”,Measurementvol. 17, No. 1, Jan. 1, 1996, pp. 17-27.
“Waelzlager 305”, 1987, Ina Waelzlager Schaeffler Kg, Herzogenaurach, XP002487830, p. 73.

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