BELARUS-1221.2/1221
В
.2/1221.3 Description and operation
114
The main gear.
The main gear is a pair of conical gear
members with helical teeth.
The axle drive gear 36 (fig.
Д
-25) is in-
stalled in the pinion carrier 29 on two roller
conical bearings. Bearings preload is ad-
justed by means of adjusting washers 30,
after that bearings are tightened up by the
nut 33. The driven gear 19 is set on the
splines and a center pilot of the differential
casing 18 and is prevented from the axial
movement by the nut 20
The main gear mesh adjustment is pro-
vided by the gasket seals 28, 15, installed
between the driving gear cage flange and
FDA housing, and also between the left
and right arm supports and FDA housing,
respectively. Before the mesh adjustment,
the differential bearings are adjusted by
means of gasket seals 15.
The hole for the plug 25 serves for test-
ing the main gear mesh adjustment.
The outflow of oil from the main gear
and axle beam housing is prevented by
the collars and rubber rings, installed in
the fixed blocks, arm supports and in the
main gear pinion carrier.
To prevent affluent of oil in front of the
driving gear collar, the obturator ring 31 is
installed on its splined end. Spiral flutes
are threaded along the outer diameter. A
sleeve-type bearing with cross grooves is
installed in the fixed block 12.
Differential.
Differential – is a self-locking type with
enhanced friction. In the differential casing
1 (fig.
Д
-26) and a cover 7 bolted together,
there are two pairs of planetary gears on
the floating axes 5, side gears 8, press-
on carriers 4 and friction disks – driving 2
and driven 3.
The self-locking differential automatically
connects both half-axes and excludes sepa-
rate wheels slipping, increasing the driving
force of the front wheels. The locking is car-
ried out when putting the front axle into oper-
ation.
Herewith the planetary gears shafts work
under load and move in the channels-
backfalls in the casing and cover of the diffe-
rential over a value of spacings between fric-
tion disks, respectively. The force is transmit-
ted from the axes to the planetary gears,
which transmit it to the carriers, and the car-
riers in their turn compress the friction disks
till they bear against the walls of the casing
and differential covers. Driving disks, having
outer cogs, are connected to the cogs of the
housing and differential cover, driven disks
(by inner cogs) – to the side gears. The fric-
tional force of the compressed disks units the
side gears and the housing with the differen-
tial cover, thus locking the differential.
When turning the tractor and when the
front axle is engaged and external forces
exceed the frictional forces in the frictional
disks, the frictional discs will slip.
The differential is installed on two roller
conical bearings in the brackets of front
axle beam. The differential bearings are
adjusted by the gasket seals 15 (fig.
Д
-
25).
Содержание 1221.2
Страница 1: ...BELARUS 1221 2 1221В 2 1221 3 1221 0000010РЭ OPERATORS MANUAL 2009 ...
Страница 290: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 293 Electrical scheme of tractor connections ...
Страница 291: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 294 Variants of tractor connections ...
Страница 293: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 290 826 3805010 instrument board scheme ...