| 摘要 |
PROBLEM TO BE SOLVED: To simplify running-in by setting the difference between the maximum value and the minimum value of the lengths of a plurality of tapered rollers to the specified value. SOLUTION: The difference between the maximum value and the minimum value of the lengths L of a plurality of tapered rollers 3 is regulated to 0.15mm or less. When running-in a tapered roller bearing 9 is started, if the head part side end surface of one roller 3 out of the rollers 3 and the inner surface 7a of a large flange part 7 are brought in contact with each other, the stable state is made, and it is needed that the minimum values of the sizeΔL of clearances 3 existing in each roller 3 is small. It is needed that the head part side end surfaces of all tapered rollers 3 and the large flange part 7 are brought into contact with each other in order to made the whole bearing 9 into the sufficient stable state. Accordingly, the mean values of the sizeΔL and deviation existing in each roller 3 are made to the small values. That is, of the variations in the lengths L of the rollers 3 are decreased, labor required for running-in can be reduced.
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