| 摘要 |
PROBLEM TO BE SOLVED: To easily set a thrust bearing clearance in a thrust bearing portion with precision. SOLUTION: A positioning member 9 is interposed between an inner bottom surface 7c1 of a housing 7 and a lower end surface 8b of a shaft bearing member 8. When the bearing member 8 is inserted along an inner peripheral surface 7a of the housing 7 until it abuts a step portion 7a1, a position of a lower end surface 8b of the bearing member 8 with respect to the inner bottom surface 7c1 of the housing 7 is decided at a given position W by the dimension from the inner bottom surface 7c1 of the step portion 7a1. Therefore, if a width dimension W of the positioning member 9 is controlled to a value obtained by adding thrust bearing clearances S2, S3 on both sides to the width dimension W1 of the thrust plate 2b W=W1+(S3+S4)}, then the thrust bearing clearances S3, S4 can be easily set with precision by the positioning member 9.
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