| 摘要 |
<p>PURPOSE:To reduce the axial direction length by providing the outer rim of an armature and a hub respectively with concentric annular flanges, supporting the armature with a damping material interposed between both of the flanges, and making the armature capable of selectively engaging with the engagement surface of the rotor. CONSTITUTION:An annular rotor 30 fitted coaxially with the stator 20 is axially supported with a hub 40 in free rotatably manner. The flange plate 60 of the hub 40 is provided with an annular flange portion 61. An armature 80 is supported by securing an elastic annular damping member 70 on the inner circumferential surface of the annular flange portion 61 and fitting the annular flange portion 81 of the annular armature 80 to the inner circumferential surface of the damping member 70. The armature 80 is opposite the engagement surface 35 of the rotor 30 with a gap in between for selective engagement with the surface 35 responding to the excitation of an electromagnetic coil 21. Since both flanges are coaxially extended and the damping material is sandwiched in between, the overall length is shortened for easy attachment.</p> |
