Patent ID: 7988378

Claim:
A friction coupling for locking a shaft relative to a hub, comprising: a radially deformable inner sleeve, arranged for frictional engagement with the shaft; a radially deformable outer sleeve, arranged for frictional engagement with the hub; an annular piston, axially movable relative to the inner sleeve and the outer sleeve, the annular piston having a conical surface to cooperate with at least one of the inner sleeve and the outer sleeve and to deform at least one of the inner sleeve and the outer sleeve when the annular piston is moved relative to the inner sleeve and the outer sleeve, so as to provide said locking; at least one actuating device, arranged to produce a movement of the annular piston for locking the friction coupling; and at least one deactuating device, arranged to produce a movement of the annular piston for unlocking the friction coupling, said at least one actuating device and said at least one deactuating device being located, seen in the axial direction, on a same side of the annular piston.