the pressure compensation conduit 22 in addition along the main extension direction 54 in the end regions 64 of the pressure compensation conduit 22 and pin 24 the pressure compensation conduit 22 has a wall with a 60 u00b0 slope in relation to the main extension direction 54 the 60 u00b0 slope simplifies a grinding process of the pressure compensation conduit 22 during a manufacture of the pin 24 together with the pressure compensation unit 18 the pressure compensation conduit 22 is embodied as tapered with a tapering extending along the main extension direction 54 from the motor compartment 16 in the direction 66 toward the transmission compartment 14 the tapering of the pressure compensation conduit 22 is embodied as stepped the pressure compensation unit 18 also has a gas permeable separating element 26 and a fixing element 30 embodied in the form of a sleeve 32 the gas permeable separating element 26 is composed of a cylindrical felt element 28 the cylindrical felt element 28 has a transverse span that is oriented essentially transverse to the main extension direction 54 of the pin 24 and corresponds is equal to a transverse span or inner diameter of a stage 70 of the tapered pressure compensation conduit 22 situated in the middle in the main extension direction 54 of the pin 24 by means of this a step shaped shoulder 72 of the pressure compensation conduit 22 holds the cylindrical felt element 28 in position along the main extension direction 54 from the motor compartment 16.