Belarus 1221.2, Руководство оператора

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BELARUS-1221.2/1221 В .2/1221.3 Description and operation
91
The speed-gear assembly is mounted
on the cover (54) and consists of the pri-
mary shaft (51) with driving pinions (2, 4,
6, 10) mounted in needle bearings riding
thereon. These pinions ensure engage-
ment of the 5
th
, 6
th
, 3
rd
and 4
th
gear, re-
spectively. The driving pinion of the 1
st
gear is made integral with the shaft (51)
and the driving pinion of the 2
nd
gear is
fixed rigidly on the shaft. The needle
bearings are force-lubricated through the
oil pipeline (53) and holes drilled in the
shaft. The male splines of the shaft carry
two inertia-type synchronizers (4) and (9);
the latter effect engagement of the 5
th
, 6
th
,
3
rd
, and 4
th
gears. The primary shaft rests
on ball bearings mounted in the cover
(54) and casing (1).
The intermediate shaft (48) carries the
press-fitted driven pinions (54, 40 and 39)
of the 5
th
, 6
th
, 3
rd
and 4
th
gear, respec-
tively. The driven pinions (43 and 41) of
2
nd
and 1
st
gears, respectively, rest on
needle bearings. An inertia-type synchro-
nizer (42) to help engagement of the 1
st
and 2
nd
gears.
The downshift and reverse gear shaft 3
(see Fig. E-15.2)
is mounted in the body
(4) and rests on bearings (1 and 12). The
shaft also carries a driven pinion (10)
which is coupled to the shaft through
bushings (9), forward driving pinion (8)
and reverse pinion (5) running in needle
bearings. These pinions are coupled with
the shaft through a toothed coupling (6).
Bushing (16) which sits on male splines
of the shaft is locked on the shaft by
means of a retaining ring (7).
Fig. E-15.2 Downshift and reverse gear shaft:
1, 12 – bearings; 2, 13 – nuts; 4 –casing; 5, 8, 10 –pinions; 6 – toothed coupling; 7 – retaining ring; 9 – bush-
ing; 11 – cover; 14 – oil delivery cup; 15 – oil pipeline; 16 – bushing