The Design of Rolling Bearing Mountings

32 Passenger car transmissionOperating dataFive-speed transmission for passenger cars for a maximuminput torque of 170 N m at 4,500 min –1 ; the 5thspeed is an overdrive gear; light-metal housing.Gear ratios: 3.717 – 2.019 – 1.316 – 1.0 – 0.804Bearing selectionInput shaftCombined bearings (deep groove ball bearing + rollerand cage assembly) as locating bearing for accommodatingradial and axial loads. The roller and cageassembly runs directly on the input shaft. The outerring is axially located via the housing cover in pulloperation and via a snap ring in push operation.Lay shaftFloating bearing arrangement with roller sleeves. Theaxial clearance is adjusted by means of fitting washersat the roller sleeve of the input end. Axial location isprovided by a snap ring. The transmission is sealed toprevent oil escape. There is an opening at the closedend of the output-side roller sleeve to facilitate dismounting.Output shaftEngine-end bearing:The roller and cage assembly runs directly on the outputshaft and in the bore of the input shaft. The cage isguided by the rolling elements. The logarithmic profileof the rollers is especially adapted to the stress resultingfrom shaft deflection. Lubricating holes in the gearwheel of the input shaft provide for a better oil supplyto the roller and cage assembly.Output end:Deep groove ball bearing as locating bearing, axial locationof the outer ring by means of the housing shoulderand retaining washer. The idlers on the outputshaft are directly supported by double-row needleroller-and-cageassemblies.Machining tolerancesBearingTolerancelocation Shaft HousingInput shaft k6 N6Direct bearing arrangementroller and cage assemblyg6Lay shaftDrive end/output end h5 N6Output shaftEngine-end bearing g6 G6Output end k6 N6Idlers(1st – 5th gear, reverse gear) h5 G632: Passenger car transmissionFAG 50