STRUCTURE FOR COUPLING CERAMICS BODY OF ROTATION WITH METALLIC SHAFT

摘要

PURPOSE:To obtain firm coupling of a ceramics body of rotation with a metallic shaft with high productivity by forming the welded surface between a metallic sleeve and the metallic shaft to the tapered surface inclining toward a rotational central axis at the metallic shaft side from the shaft projecting part end face of the ceramics body of rotation. CONSTITUTION:The end face (the face to be welded and joined face 9) at the tip side of the shaft projecting part 2 of the metallic sleeve 3 is formed so as to correspond to a part of the conical surface formed in the case the surface to cross orthogonally to the rotational central axis 10 of a ceramics turbine wheel 1 is inclined to the metallic shaft 4 side. The same shaped face formed on a flange part 13 of the metallic shaft 4 is then pressed on the above- mentioned face. The ceramics turbine wheel 1 is then coupled with the metallic shaft 4 via the metallic sleeve 3 by performing electron beam welding 5 from the diagonal direction with respect to the rotational axis of the turbine wheel 1.