Section B. Technical data
Belarus – 90/92 Operating manual
21
double gear 46 (pic.
а
). Shifting lever of back
gear is derived in the tractor cabin. By forward
movement of lever the back gear is switched
on, by backwards movement it is off. The lever
is fixed by means of fixator.
Gear box
The gear box is intended for changing of
transmission reduction ratio and provision of
reverse and receiving different reversible rates
of tractor motion.
In addition, the construction of gear box
provides the drive of front driving axle of
tractors Belarus 92, of synchronous rear and
side power take-off, and provides a possibility
of underspeed receiving by mounting of speed
reducer.
Device and working of gear box
The gear box (pic.
а
, b) contains in the casing
5 located concentric among themselves main
drive shaft 5 and secondary shaft 10, and
parallel located countershaft 2 and shaft of the
I gear and reverse gear 58.
The main drive shaft is mounted on two ball-
bearings, one of them is located in the cup 6
attached to casing, and the second — in the
boring of the secondary shaft leading end. On
the shaft splines are mounted the driven gear
of the back gear 4 and movable drive gears 8
of the III gear and 7 of the 7 IV and V gears.
On the splines of the cored countershaft 2 the
driven gears 40, 43 and 39 are fast fixed. On
the gear hub 39 rotates the countershaft 37.
The countershaft 37 is constantly geared with
gear 8, giving a possibility of switching on of
hill climbing and reverse gears through the
gear wheel 56, and application of reduction
gear and side power take off. On the splines of
the back shafting part is flexible the driving
gear of I gearing pass 36.
As support of countershaft come the bearing
44 and bronze plug 34, mounted in the
opening of drive gear II of gearing pass 35.
The gear wheel 35, mounted in the cup on two
rolling bearings 33, is provided with external
and inner tooth rings, and on the after end —
with clutch pins for drive of synchronous rear
power take off. In the opening of gear wheel
by means of pins the cluster 30 is fixed with
bronze plug 31, that composes as support of
internal shafting 32; from outside on the gear
wheel is fixed the impeller 29 that serves for
improved lubrication of gear wheels of the
main gear and differential via intensive oil
spattering.
The secondary shafting 10 on the front end
has on the front end external and internal
rings; executed together with him. As support
of the secondary shafting come bearings
conical rolling bearings 27 and 28, on the
shafting splines are hard-mounted the driven
gear II of the gearing pass 26 and the drive
conical gear of the main gear 25, that is fixed
from the back side with a screw 24.
By meshing of gear wheel 36
с
with external
ring of secondary shafting 10 I pass of gearing
is switched on, that ensures I, III, IV and V
forward gears and I reverse gear, the rest
gears are provided with the II pass. Moving
the gear wheel 36 backwards till the full
engagement with the inner ring of gear wheel
35, the II pass of gearing is switched on.
By switching on the I (or II) pass of gearing the
cluster gear 7 when moving forward switches
V (or VIII), and when moving backwards — IV
(or VII) gears. Gear wheel 8 in motion forward
switches III (or VI) gears, and in motion
backwards is engaged with teeth of inner ring
of the secondary shafting 10, switching the
direct (IX) drive.
The shafting 58 is driven through the driven
gear wheel of the hill-climbing and reverse
gears 56 (herewith the gear wheel 55 is
connected with inner splined ring of the gear
56 and shafting 58, as showed on the picture
b). When moving the sliding gear of the hill-
climbing and reverse gears 57 backwards is
switched on the I (or II) gear, and when
moving forward — reverse gears (through
gear wheels 57, 41 and 43 on the countershaft
2). The intermediate gear 41 of the reverse is
rotated on the stationary axle 42 and operates
with the smaller ring of gear 43.
On the exposed face of gear box coaxial with
intermediate shafting the cluster 45 (pic.
а
), is
fixed, inside of which the front bearing of
internal shafting is mounted, and outside —
bearings of intermediate pass gear 46. Right
and left the gear box casing has hatches, that
are mantled with side covers, by removal of
that you can hold on inspection of gear box
parts, and carry out the installation of side
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