公开(公告)号：US3618720A

公开(公告)日：1971-11-09

申请号：US3618720D

申请日：1970-07-30

Applicant: BULOVA WATCH CO INC

Inventor： LINKE ERNEST A

IPC: F16D37/02

CPC classification number: F16D37/02 ,  F16D2037/002

Abstract: A magnetic-particle clutch constituted by a stator surrounding a rotor assembly having an input member and an output member which are intercoupled when the stator coil is excited. The input or drive member is a cylindrical body having an annular cavity for containing magnetic particles, the output or driven member being formed by a shaft coaxially disposed within the input member and rotatably supported therein, a cylindrical particle-trap rotor being mounted on said shaft and being positioned to rotate within the annular cavity. The particle-trap is formed by a circular cage of alternately polarized parallel bars which create an internal magnetic field to retain the magnetic particles in the interstices of the cage in the unexcited state of the clutch. When the stator coil is excited to produce an external magnetic field, the particles are reoriented to bind the cage to the input member, thereby coupling the drive and driven members.