| 摘要 |
While applying an ultrasonic vibration to a housing 7 and/or a bearing sleeve 8 , the outer peripheral surface 8 d of the bearing sleeve 8 is press-fitted into the inner peripheral surface 7 c of the housing 7 with a predetermined interference, and is welded thereto. During the press-fitting, the region of the inner peripheral surface 7 c of the housing 7 coming into contact with the bearing sleeve 8 is melted or softened by the action of the ultrasonic vibration, so that, as compared with a case in which only press-fitting is conducted, the requisite press-fitting force at the time of press-fitting can be substantially reduced.
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