a decoupling device for the bearing arrangement of a shaft carried in a housing , in particular a shaft of a belt - driven conical - pulley transmission with a chain that functions as the belt . the decoupling device includes an outer bearing ring configured with a circularly cylindrical outer surface and within which the shaft is mounted , and an inner surface of a housing that encloses the bearing ring outer surface . at least one radial ondular washer is arranged between the bearing ring outer surface and the housing inner surface , which allows a limited relative radial movement between the housing inner surface and the bearing ring outer surface by elastic deformation of the washer .