b ylo accepted solved s purchase modern foreign coach-
parameters are defined reliability are motor MAZ -
es large class of Mercedes-Benz to serve a large popula-
642208 - 020, Ford-Cargo - 1827 (Table. 1 . And 2 ).
tion of the city of Tashkent. Mercedes-Benz buses have
For details and sites, critical for the reliability of been operating in the city of Tashkent since 1995, their
the car or the unit include parts and components that number in a year and the composition of l and 1000
have at least 50% of the failures of the total number of
units.
failures and not less than 70% of value cost of the total
Buses operated by 10 bus depots are daily mainte-
amount of costs that go to address these failures, ie for nance ie at bus depots and maintenance at the subsidiar-spare parts and parts replacement work.
ies' service centers, buses Mercedes-Benz " (in Unitary Enterprise" Toshavtotamirhizmat ").
34
Журнал «Интернаука»
№ 16 (145), часть 3, 2020 г.
Table 1.
Distribution of failures of Ford-Cargo 1827 and MAZ 642208-020 truck tractors by systems and groups on a runof 0 ÷ 150 thousand km
Ford-Cargo 1827
MAZ-642208-020
s
s
s
s
s
s
re
re
r
re
re
r
ilu
ht%
ilu
o
ht%
o
ct
ilu
ilu
ct
№ Name of systems and
f fa
f specie
f fa
f fa
f specie
f fa
groups
tra
tra
o
weig
o
o
o
weig
o
o
er
ic
er
ne
ic
er
ne
if
er
er
if
er
ec
n o
n o
o
ec
o
Numb
Sp
Numb
Numb
Numb
Sp
Numb
Numb
1
ICE
75
6.7
1 0
3
142
8.6
1 6
5.7
2
Supply system
40
3,7
10
1,6
25
1,6
10
1
3
Cooling system
103
9.6
9
4.12
38
2,4
9
1,5
Engine lubrication
4
2
0.2
2
0.08
22
1.4
7
0.88
system
5
Gearbox
2
0.2
1
0.08
125
7.6
22
5
6
Clutch
17
1.7
5
0.68
4 0
2,5
7
1,6
7
Brake system
26
2,4
9
1,04
128
7.8
15
5.1
8
Steering gear
5
0.5
2
0.2
14
0.9
6
0.56
9
Front axle
5
0.5
3
0.2
29
1.8
8
1,2
10 Middle bridge
-
-
-
-
41
1,6
11
1,6
11 Rear axle
13
1.3
7
0.52
2
0.1
2
0.08
12 Cardan
-
-
-
-
6
0.4
2
0.24
13 Electrical equipment
15
1,5
9
0.6
90
5.5
14
3.6
14 Frame
2
0.2
2
0.08
5
0.3
4
0.28
15 Wheels
751
70
2
30.04
921
55.5
2
36.84
16 Cabin
6
0.6
5
0.24
9
0.5
6
0.36
17 Pendants
10
0.9
6
0.4
24
1,5
7
0.9
Total
1072
100
82
42.88
1661
100
148
66, 44
Failure
distribution
was determined for Ford-
C argo 1827 and MAZ 642208-020 auto-tractor units .
Table 2.
Distribution of failures of the engine of autotractors Ford- Cargo 1827 andMAZ 642208-020 for parts and assemblies on a run of 0 ÷ 150 thousand kmFord Cargo 1827
MAZ 642208-020
Name of parts and as-
№
Number
Specific
Nature of
Number of
Specific
Character
semblies
of failures
weight%
failure
failures
weight%
rejection
1 Sleeve
11
14 , 7
wear
16
11.3
wear
2
Piston
8
10.6
wear
11
7.7
wear
3 Loose leaf
7
9.3
wear
15
10, 5
wear
4 Connecting rod
7
9.3
wear
15
10.5
wear
5 Set of rings