Интернаука №16 (часть3) 2020 - [28]

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

11

14.7

wear

14

9.8

wear

6 Oil pump

-

wear

1

0.7

wear

7 Head gasket

11

14.7

burnout

14

9.8

burnout

8

Connecting rod

-

wear

4

2,8

wear

9

Head cover gasket

11

14.7

burnout

15

10.5

burnout

10 Pusher

-

wear

3

2,3

wear

11 Yoke

-

wear

3

2,3

wear

12

Barbell

-

wear

6

4.3

wear

13

Crankshaft

1

1.3

wear

1

0.7

wear

35

Журнал «Интернаука»

№ 16 (145), часть 3, 2020 г.

14

Exhaust manifold gasket

5

6.6

burnout

15

10.5

burnout

1 5 Piston pin

-

wear

4

2,8

wear

1 6 ICE pillow

3

4.1

wear

5

3,5

wear

Total

75

100

142

100

Bus operating conditions in Tashkent. The tempera-

 Service by year (once a year, three years 1 time,

ture of the air - a maximum of + 44 ° , minimum, -29 °

five years 1 time)

C , , average - 14.8 ° C . Humidity air : - in the period of In order to determine the reliability indicators of

time is hot - 21%, - a cold time - 55%. About 429 mm Mercedes-Benz O 405 buses in hot climates and heavy

of precipitation falls annually. Barometric pressure

traffic in a big city, taking into account the specific con-

is 1.0 kg per 1 cm 2 . The average annual wind speed is ditions of operation on the city routes , Mercedes-Benz 1.4 m/s.

O 405 buses were tested

The reliability of buses for specific operating condi-

A study was conducted to select the equivalent of

tions largely depends on the accepted modes of bus ser-

motor oils for Mercedes-Benz and Otayul buses from

vice, which characterizes the frequency, list of opera-local production instead of imported ones and establish

tions, and their complexity.

the optimal timing for their replacement. [1 9 ]

The system of service for specific maintenance

Was conducted controlled operation of 40 buses,

conditions buses designed with buses Guidance Docu-

"Mercedes-Benz O 405" 8 - the bus fleet of the city of ment "Mercedes-Benz" joint analysis of the operating Tashkent . Units and parts critical to reliability have experience of the service station, chronometry results been identified [ 20 ].

data and expert evaluation specialists [1 5 16,17,18 ] .

Reliability maps of Mercedes-Benz O 405 buses

After-sales service of Mercedes-Benz buses is di-

have been developed, which are necessary for improv-

vided into the following types:

ing the design, production and operation of buses [ 21 ].

 daily maintenance (performed in the ATP).

Were first identified indicators buses reliability

 after-sales service with a frequency of 15.0

properties of the "Mercedes-Benz O 405" for the com-thousand km (S-15000km.)

plete life cycle, which amounted to 1,250,000

 After-sales service with a frequency of 30.0

km, significantly more resources 1 000 000 km, set by

thousand km (S-30000km.)

the manufacturer! [ 22 ] .

 after-sales service with a frequency of 45.0

In

[ 22] shows a detailed

information

about

thousand km (S-45000km.)

the district aspredelenie failures buses Mercedes-Benz

 After-sales service with a frequency of 90.0

O 405 for systems and units on the run 0 ÷

thousand km (S-90000km.)

1250 you s.km (tablitsa №3)

Table 3.

Distribution of failures of Mercedes-Benz O 405 buses by systems and aggregatesat a range of 0 ÷ 1250 thousand km

The

f

il-

s

ce

o

it

Total

amount of

s

un

ic

f fa

bu

ic

%

№

Name of units and

er

if

ht,

o

expense failure

if

costs per

rt

un

te

ht

parts

l bo

ec

%

er

ec

pa

ra

repair parts ,

bus ,

per

ta

Sp

weig

Numb

o

thousand soums

Sp

weig

thousand

T

ures per

Numb

soums

Suspension and

1

8

3455

15.7

86.4

3234058,0

25.8

80851.5

suspension

Electrical

2

25

2622

11.9

65.6

1280,170.4

10,2

32004.3

equipmente

Engine cooling

3

16

1847

8.4

46.2

771802.1

6.2

19,295.1

system

4

Engine OM 447 N

12

1860

8.5

46.5

739 625.6

5.9

18,490.6

Automatic gearbox

5

21

1801

8.2

45.0

556,143.1

4.6

13903.6

ZF 4 HP 500

Reliability-limited reliability

52.7

Chassis, bodywork

6

27

1807

8.2

45,2

1696536,4

13.6

42,413.4

and superstructure

7

Brake system

20

1362

6.2

34.1

859935.2

6.9

21498.4

Heatingis,

8

17

1364

6.2

34.1

770737.7

6.2

19268.4

and circulation

36

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