A polymer containing in the backbone a 9-oxo-9-phosphafluorene-2,7-diyl skeleton or a combination of the skeleton with a vinylene skeleton or arylene skeleton. The outer part of the constant-velocity joint is situated opposite the inner ring flange of the bearing with clearance, and the outer part has an axially aligned extension section, in the area of which torque is transmitted. For this purpose, it is provided that the capsule housing has a number of fixing aids adapted in their outer dimensions to an injection mold assigned to the sensor encapsulation.