Bevel Wheel Gear Group - Belarus 80.1 Operation Manual

3.10.1.3 Bevel wheel gear group

Wheel gear group is intended to transmit torque from the FDA differential to the
drive steering wheels. The composition of the bevel wheeled group is shown in figure
3.10.3.
In covers 2 (figure 3.10.1) of the FDA beam the wheel gear group of final drives is
installed, consisting of the two bevel gears and pinions – upper and lower, which at the
same time serve as joints of equal angular speeds, as well as bracket 34 of the front
wheels steering control.
The turning angle of the wheel gear groups is limited by the length of the hydraulic
cylinder rod.
Half axle teethed crowns 16 (figure 3.10.3) and vertical shaft 30, are made in one
piece with spline drives, form upper bevel gear and pinion.
Half axle and vertical shaft connect with their spline drives to half axle gear of differ-
ential 1 (figure 3.10.2) and driven gear of the lower bevel gear and pinion 38 (figure
3.10.3). Half axle is mounted on two tapered roller bearing 18 in the body of the upper
bevel gear and pinion 17, vertical shaft – in the boring of tube pivot 26 and rests on bear-
ings 18. The half axle is fixed with screw 46 and is locked with nut 47, vertical shaft is
locked with two screws 14. Preload in the bearings is adjusted by selection of adjusting
rings 19 and is clamped with nut 20. To prevent unscrewing nut collar is center punched in
the half axle and vertical shaft grooves.
Pivot tube flange 12 goes with it seating area into the boring of upper bevel gear and
pinion housing 17 and together with seal housing 28 is secured to it by bolts.
Adjustment of the upper bevel gear and pinion meshing is ensured by shims 25,
mounted between pivot tube flange 12 and upper bevel gear and pinion body 17.
The upper bevel gear and pinion cavity is sealed with gaskets 21, 29 and ring 13
and shims over the sealing surface of cover 15.
Bodies of the upper bevel gears and pinions 17 are installed moveably in the bor-
ings of FDA covers 2 (figure 3.10.1), which makes it possible to change the gauge of the
front axle by rotation of worm 30. Each body is locked against movement by two wedges
31 and pin 28.
Pivot tube 26 (figure 3.10.3), resting on coiled cylindrical spring of suspension 33,
goes into pivot bush 31, pressed into wheel gear group housing 37 and locked in it by pin
32. Lower end of spring rests on washer 34 and thrust bearing 35, mounted in wheel gear
group housing 37, which provides spring suspension of the front axle. The suspension
movement is limited by washer 34 when pivot tube 26 moves downwards, when the pivot
tube moves upwards together with seal housing 28 – by thrust collars on the seal housing
and bush 31. Pivot connection is sealed with two rings 11.
Lower bevel gear and pinion consists of drive gear 38 (mounted on two roller bear-
ings 36, 39 in wheel gear group housing 37, closed by cover 40) and driven gear 41,
mounted on flange splines 2, to which front wheel disc is secured by bolts and nuts 1.
Wheel disc flange 2 rotates on roller bearing 43, mounted in the boring of wheel
gear group housing 37 and on two tapered roller bearings 3, pressed into cover 8. Preload
in bearings 11 is adjusted by selection of adjusting rings 7.
Bearings and gear 41 are locked against axial movement by washer 42 and two
bolts, fastened by bending plate.
Adjustment of lower bevel gear and pinion meshing is provided by shims 9, mount-
ed between cover 8 and wheel gear group housing 37.
Filling of oil in the wheel gear group housing is carried out up to the lower edge of
the filler hole, in which plug 33 is installed (figure 3.10.1), and drain is carried out by un-
screwing drain plug 32.
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80-0000010B OM