| CPC F16H 48/34 (2013.01) [F16H 48/42 (2013.01); H02K 7/006 (2013.01); H02K 11/21 (2016.01)] | 20 Claims |

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1. An electromagnetic actuating device for a torque transmission system, the electromagnetic actuating device comprising:
a shell arranged around an axis X, the shell being fixed relative to the axis X and comprising walls defining an annular cavity which houses a coil and at least partially a plunger which is able to move axially along the axis X to actuate a coupling device, the actuating device being characterized in that the shell also comprises a recess and the actuating device comprises a detection lug fixed to the plunger and passing through this recess, wherein the detection lug is able to be detected by a sensor so as to generate a signal representative of the axial position of the plunger, wherein the plunger is centred by its outer circumference on the shell.
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