Spring-actuated electromagnetic brake with noise suppressing device

摘要

A spring-actuated electromagnetic brake includes a noise-suppressing device for suppressing a striking noise emitted when an armature is attracted onto a field to release the brake when an electromagnetic coil is excited to magnetize the field. The noise-suppressing device is comprised of a plurality of hemispherical elastic members each disposed in one of recesses formed in one of two opposed surfaces of the field and the armature. When the brake is in the engaged state, a hemispherical surface of each elastic member partially projects from the recess and is in contact with the other of the two opposed surface. When subjected to a compressive force or pressure applied from the armature, the hemispherical elastic member undergoes elastic deformation as a whole and does not produce any locally concentrated elastic deformation. The hemispherical elastic member is highly durable and is able to greatly suppress the striking noise generated when the brake is released.