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26 Infinitely variable gear<strong>The</strong> main components <strong>of</strong> this infinitely variable gearare two shafts linked by a chain which is guided by twobevelled drive disks at each <strong>of</strong> the shafts. By varyingthe distance between the bevelled drive disks the runningcircle <strong>of</strong> the chain increases or decreases, providingan infinitely variable transmission ratio.<strong>Bearing</strong> selection<strong>The</strong> two variator shafts are each supported by twodeep groove ball bearings FAG 6306.<strong>The</strong> driving torque is transmitted by sleeve M via ballsto the bevelled disk hub H. <strong>The</strong> ball contact surfaces <strong>of</strong>coupling K are wedge-shaped. Thus, sleeve and bevelleddisk hub are separated depending on the torquetransmitted, and subsequently the contact pressurebetween chain and disks is adapted to the torque.Two angular contact thrust ball bearings FAG751113M.P5 and one thrust ball bearing FAG51110.P5 accommodate the axial loads resulting fromthe contact pressure.Torque variations are associated with small relativemovements between shaft and drive disks; for this reasonthe two parts are separated by needle roller andcage assemblies (dimensions 37 x 45 x 26 mm).LubricationOil bath lubrication provides for ample oil supply tovariator components and bearings.Machining tolerances<strong>Bearing</strong> Seat Diameter Cylindricity tolerance Axial runout tolerancetolerance (DIN ISO 1101) <strong>of</strong> abutment shoulderDeep groove ball bearing Shaft k5 IT3/2 IT3Housing J6 IT3/2 IT3Angular contact thrust ball bearings Bevelled disk hubs/ k5 IT2/2 IT2and thrust ball bearing Sleeve IT3Needle roller and Shaft h5 IT3/2 IT3cage assembly Housing G6 IT3/2 IT326: Infinitely variable gearFAG 40
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