2022.3-0000010 OM
1 – nut; 2,4 – tapered roller bearing; 3 – spacer rings; 5 – housing; 6, 24 – tapered roller bearing; 7,19 – adjusting nut; 8 – level/fill plug; 9,22 – axle shaft; 10 – locking bolt; 11 – bolt; 12 – driven gear; 13,14 – differential case; 15 – cage; 16,17 – disks; 18 – lock plate; 20 – pinion shaft; 21 – pinion; 23 – axle shaft gear; 25 – drive gear; 26 – collar. Figure 3.11.2 – Central reduction unit 3.11.3 Wheel gear group The wheel gear group set is a parallel-shaft planetary reduction unit, which is meant for transfer and increase of torque from the FDA differential at various turning angles of the front driving wheels. The reduction unit consists of a double joint, a cylindrical and planetary drive, pivot connection and levers controlling front wheel turning. The double joint 21 (figure 3.11.3) is connected with the FDA differential by means of a shaft 17 from one side, and with a drive gear 9, meshed with a driven gear 27 of the cylindrical drive. The drive gear is mounted on tapered roller bearings 10. A toothed ring of the gear 27 is in constant mesh with a sun gear 2 of the planetary drive, which drives a front wheel flange 30 through pinions 4, shafts 3, a carrier 29 and a crown ring 5. The flange is installed in roller bearings 1 and 25, adjusted without a clearance. The bearings are adjusted by tightening the nut 32 with a torque of 180 to 200 Nm and its further undoing by the angle of 15 to 20°. The pivot connection is created by upper and lower pins 14, 24 and tapered roller bearings 16, 23, installed in bores of a knuckle housing 26 and an axle beam 18. Preload in the bearings 16, 23 is adjusted by shims 15. The force to turn the wheel group in relation to the pivot center, applied to the wheel group flange, shall make 60 to 80 Nm. Clearance in bearings 10 of the drive gear shall not exceed 0.05 mm, it is adjusted by shims 22.
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