| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electromagnetic brake and an electric motor in which, in the case of using the electric motor with its shaft thereof in a vertical position, static friction torque and dynamic friction torque caused by electromagnetic brake portions is reduced, thereby enabling to provide reliable electric motor torque on the electric motor output shaft, and stable braking. <P>SOLUTION: The electromagnetic brake includes: a hub attached to a rotating shaft and rotated with rotation of the rotating shaft; a friction plate rotated in engagement with the hub and movable in an axial direction; multiple brake plates sandwiching the friction plate, held against rotation by the rotating shaft, and movable in the axial direction; a brake plate retaining member for fixing the brake plates in a direction of shaft rotation and retaining the brake plates in an axially movable manner; a pressure transmitting member for receiving pressure and pressing the brake plates; a pressure generating mechanism for generating pressure to be applied to a brake plate pressing member; a stress generating mechanism for generating stress against the pressure applied to the brake plate pressing member; and a stepped portion of the brake plate retaining member provided at a position between the respective brake plates of the plurality of brake plates, in the brake plate retaining member. <P>COPYRIGHT: (C)2012,JPO&INPIT |
