The Design of Rolling Bearing Mountings

52Universal quill drivefor threephase current locomotives of series 120All four wheelsets of series 120's threephase current locomotivesare driven. The traction motor arrangedtransversely to the direction of travel is connected tothe bogie at three points. The torque of the tractionmotor acts via pinion and bullgear on a universal quilldrive which is linked to the bullgear and driving wheelby the articulated lever coupling. The driving wheeltransmits the tractive force to the rails.Operating dataTop speed: 200 km/h; number of motors: 4; nominalpower per motor: 1,400 kW; motor speed: max.4,300 min –1 .Bearing selectionThe bullgear is supported on the universal quill drivein two tapered roller bearings FAG 534052 (dimensions:381.03 x 479.475 x 49.213 mm) which aremounted in O arrangement. Even with a small bearingdistance there is a relatively large spread and as a resulttilting rigidity is high.The quill drive housing is stationary. The cones, whichcarry point load, have a loose fit. The cups carry circumferentialload and have therefore a tight fit in therotating bullgear.The axial clearance of the bearing pair depends on themachining tolerances of the bearing seats and the operatingconditions. With inner and outer spacer sleevesbearing adjustment is not necessary when mounting.LubricationDuring mounting the bearings and the space betweenthe webs of the outer spacer sleeves are completelyfilled with a lithium soap base grease of the NLGI class2. They are relubricated after every 150,000 km. Thegrease is fed through the holes of the sleeve's web.52: Bullgear bearing arrangement for a universal quill driveFAG 74