Patent ID: 6302616
Filing Date: 2001-10-16
Classification: B23K,Y10T

Abstract:
A rotation mechanism comprising:a rotation shaft;a fixed member fixed to the rotation shaft; anda rotation member rotatably fitted to the rotation shaft with the rotation shaft fitted in a connection hole formed in the rotation member,wherein in a state in which one of end surfaces of the rotation shaft abuts against one of side surfaces of the fixed member, the rotation shaft and the fixed member are welded and fixed to each other by high density energy beams radiated from a direction of the other side surface of the fixed member,wherein the rotation shaft comprises a connection pin rotatably fitted to the connection hole formed in the rotation member,the fixed member is welded to a tip end surface of the connection pin,the connection hole of the rotation member comprises a spot faced surface having a small diameter portion and a large diameter portion,the small diameter portion is finished into such a size that the small diameter portion smoothly rotates without rattling with respect to a shaft diameter of the connection pin, andthe large diameter portion is formed greater than a diameter of a head of the connection pin.