Patent ID: 7262525
Filing Date: 2007-08-28
Classification: H02K

Abstract:
1. A rotor comprising: a cylindrical shaft that is formed through plastic working; and an insert member that is fitted into the cylindrical shaft in an axial direction of the cylindrical shaft, wherein: the cylindrical shaft includes a positioning portion that is formed in an inner peripheral surface of the cylindrical shaft by the plastic working of the cylindrical shaft; the positioning portion is detachably engageable with an external engaging means, which is insertable into the cylindrical shaft in the axial direction of the cylindrical shaft to position the cylindrical shaft in a circumferential direction; when the positioning portion is engaged with the external engaging means, relative rotation between the cylindrical shaft and the external engaging means is limited; the positioning portion defines a receiving hole therein for receiving the external engaging means; the cylindrical shaft further includes: a stop surface, which is formed integrally in the inner peripheral surface of the cylindrical shaft by the plastic working of the cylindrical shaft and which axially engages the insert member; the stop surface stops further insertion of the insert member in the axial direction of the cylindrical shaft; the positioning portion extends from the stop surface away from the insert member in the axial direction of the cylindrical shaft; and an outer peripheral surface of the cylindrical shaft is directly supported by at least one bearing.