| 摘要 |
An electromagnetic coupling device comprising a hub (6) provided with press faces (10d) at an interval in the rotational direction, an armature (13) coupled with the hub (6) such that it can move in the axial direction and can displace relatively in the rotational direction, a resilient member (11) coupling the armature (13) and the hub (6), a rotor (4) having a frictional face attracting the armature (13) magnetically and an annular engaging face (4e) projecting in the axial direction from the frictional face and extending to the radial outside of the press face (10d) of the hub (6), an engaging member (17) provided between the engaging face (4e) of the rotor (4) and the press face (10d) of the hub (6) and engaging frictionally with the engaging face (4e) of the rotor (4) through relative displacement of the hub (6) and the armature (13) in the rotational direction, and an exciting coil (20) generating a magnetic flux for attracting the armature (13) magnetically to the frictional face of the rotor (4) while resisting against resilient resetting force of the resilient member (11) in the axial direction. When the hub (6) and the armature (13) displace relatively in the rotational direction while resisting against resilient resetting force of the resilient member (11), the engaging member (17) is pressed by the press face (10d) of the hub (6) to engage frictionally with the engaging face (4e) of the rotor (4).
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