Electromagnetic spring clutch
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorToshiaki Yamada
Life of this patent
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Abstract
An electromagnetic spring clutch comprises a driving member, to be driven by a belt, and a driven member, which is connected to a load shaft, and to which revolving power is to be transmitted from the driving member by a clutching coil spring. One end of the coil spring is fixed to the driving member and the other end is fixed to a rotor which is freely rotatable and has several rotor windings, each shortcircuited. A stator having several windings to be excited by a power source is disposed closely parallel to the rotor for electromagnetically braking it, to thus twist the coil spring and make it grip the driven member.
Claims10
An electromagnetic spring clutch comprising:
- a stator having an electrically excitable winding;
- a rotor fixed against axial movement and having a secondary induction conductor positioned in an electromagnetic induction coupling relation with respect to said winding, braking of rotation of said rotor being effected by exciting said stator winding;
- a driving member rotatable coaxially with said rotor;
- a driven member rotatable coaxially with said driving member;
- and
- a coil spring fixed at one end to said rotor and at the other end to said driving member and having an intermediate part coaxially surrounding a cylindrical part of said driven member, said intermediate part normally being out of contact with said cylindrical part but being contractable into gripping engagement therewith to drive said driven member on relative twisting movement between said spring ends effectible by braking of said rotor.
Dependencies are inferred from the claim text.