STUDY OF FAILURES OF ISUZU BUSES OPERATED IN THE CITY OF TASHKENT

ИССЛЕДОВАНИЕ ОТКАЗОВ АВТОБУСОВ "ISUZU" ЭКСПЛУАТИРУЕМЫХ В ГОРОДЕ ТАШКЕНТЕ

Tajibaev A.A. Alimardanov R.A. Abdurashidov I.Z.

28.03.2023 96

3(108)

18. Транспорт

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Tajibaev A.A., Alimardanov R.A., Abdurashidov I.Z. STUDY OF FAILURES OF ISUZU BUSES OPERATED IN THE CITY OF TASHKENT // Universum: технические науки : электрон. научн. журн. 2023. 3(108). URL: https://7universum.com/ru/tech/archive/item/15100 (дата обращения: 02.05.2024).

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ABSTRACT

The article studies the failures of ISUZU buses operated in the city of Tashkent. Typical malfunctions of buses "ISUZU" are determined on the example of "TRUCK AND BUS" LLC SERVICE” located in the car park №2 in Tashkent. (on the example of 100 buses)

АННОТАЦИЯ

В статье изучается отказы автобусов ИСУЗУ эксплуатируемых в городе Ташкенте. Определены типичные неисправности автобусов "ISUZU" на примере ООО “TRUCK AND BUS SERVICE” находящегося в автопарке №2 г.Ташкента. (на примере 100 автобусов).

Keywords: breakdowns, malfunction, operation, bus, conditions, climate, clutch.

Ключевые слова: поломки, неисправность, эксплуатация, автобус, условия, климат, сцепления.

Introduction

Currently, the rapid growth of the population in large cities of the Republic of Uzbekistan causes problems in the urban public transport system, so the solution of these problems poses huge challenges for engineers in the field of road transport. As you know, in the public transport system of Tashkent, which is one of the largest cities in Uzbekistan, several brands of buses are used, and ISUZU buses are used in many directions. One of the main drawbacks of the ISUZU bus is the rapid failure of the clutch, which is caused by the frequent use of the clutch in urban areas. Clutch reliability research is considered very relevant.

In the Republic of Uzbekistan, the production of trucks, cars and buses is widely established. This, in turn, has a positive effect on the economic development of the republic. For high-quality service of the population by ISUZU buses, it is necessary to prevent and eliminate failures and malfunctions during its operation. It will be necessary to carry out timely maintenance and repair of buses on the basis of regulatory documents.

Target: ISUZU Bus Failure Study.

Research results:

Table 1.

Determination of typical malfunctions of buses "ISUZU" on the example of LLC "TRUCK AND BUS SERVICE" located in the car park №2 in Tashkent. (on the example of 100 buses)

№	*Aggregates*	*Common failures and malfunctions in Isuzu buses by mileage interval, (thousand km)***
№	*Aggregates*	0 50	50 100	100 150	150 200	200 250	250 300	300 350	350 400	400 450	450 500	Total	%
1	Engine	-	-	2	6	11	35	23	8	6	11	102	8.6
2	Cooling system	-	3	6	13	13	36	26	12	15	17	141	11.9
3	Supply system	-	2	5	16	19	39	31	18	11	23	164	13.9
4	Clutch	-	-	6	17	17	36	28	19	14	25	162	13.7
5	Transmission	-	2	5	11	9	10	10	18	17	16	98	8.3
6	Cardan shaft	-	-	-	-	-	-	1	-	1	-	2	0.1
7	Rear axle	-	-	-	2	4	2	2	3	3	1	20	1.6
8	Wheel and hub	6	13	26	6	7	31	19	39	23	31	201	17
9	Steering	-	-	-	2	1	3	4	3	3	2	18	1.5
10	Brake system	-	-	6	12	17	11	11	14	13	20	104	8.8
11	Electronic equipment	-	-	3	9	13	10	16	10	3	13	77	6.5
12	Carcass	-	2	5	14	4	19	8	6	3	7	68	5.7
	Total	6	22	64	108	117	235	181	154	118	170	1178	100

Table 2.

Determination of ISUZU bus clutch failures on the example of TRUCK AND BUS SERVICE LLC located in the vehicle fleet №2 in Tashkent

№	*Aggregates*	*Common failures and malfunctions in Isuzu buses by mileage interval, (thousand km)***
№	*Aggregates*	0 50	50 100	100 150	150 200	200 250	250 300	300 350	350 400	400 450	450 500	Total	%
1	Pedal	-	-	-	-	-	-	-	-	1	-	1	0.1
2	Stock	-	-	-	-	-	-	-	1	-	-	1	0.1
3	Master cylinder	-	-	2	5	8	21	15	19	14	9	93	16.4
4	Clutch disc	-	-	9	15	30	26	19	14	22	8	143	24.7
5	Clutch cover	-	-	-	-	-	-	11	-	-	4	15	2.6
6	Car tank	-	-	-	-	-	-	2	1	4	-	7	1.2
7	Pipe	-	-	-	-	-	5	-	2	-	-	7	1.2
8	Working cylinder	-	-	1	23	15	32	18	24	13	27	153	26.5
9	Spring	-	-	-	-	-	2	-	-	4	-	6	1
10	Clutch fork	-	-	-	-	-	6	4	12	7	8	37	6.5
11	Release bearing	-	-	-	3	21	15	11	28	14	22	114	19.7
	Total	-	-	12	46	74	107	80	101	79	78	577	100

The mode of movement of buses in intensive urban conditions differs from the suburban one (under the same conditions of the road surface) as follows: speed 50-52%; frequency of crankshafts 130-136%; gear shifting is 3-3.5 times greater: the relative friction of the clutch drive disc is 8-8.5 times greater; 3.0-3.6 times more movement along the reciprocating trajectory. The main mode of transport in the city of Tashkent is the city passenger bus. Buses are used very intensively. Daily mileage: 289.3 km; annual road mileage is 98.6 thousand km; operating speed 21.10 km/h; coefficient of technical readiness 0.963; the output ratio on the line is 0.946.

The weather in Tashkent is hot and sometimes humid. As a result of heating the rubbing surfaces of the clutch of a car with a high temperature of dry hot air, its reliability is lost, friction between the surfaces increases and, if it is not prevented in time, parts and assemblies begin to fail early. High temperature and humidity, in turn, cause rapid corrosion of surfaces and require frequent replacement.

Clutch parts of ISUZU buses running around the city of Tashkent are subjected to heavy loads. For example, a bus moving along a route causes damage to the drive disc, drive disc running surfaces, and flywheel when it stops at every stop, traffic light, and intersection.

During peak hours, passenger traffic increases, which affects the greater load. In turn, when the bus moves from a place, the clutch parts are subjected to great stress. In this regard, frequent repair of buses is required. That is why the reliability of ISUZU buses and their assemblies-mechanisms is very important.

Conclusion:

Based on the results of the analysis, the following conclusions were drawn:

The failures and malfunctions of ISUZU buses operated in Tashkent were studied, the results of the study were analyzed.
The influence of natural climatic and road conditions on the operation of the clutch has been studied, the influencing factors have been determined, that is, it has been established that the traffic flow consists of a complex of natural climatic and road conditions.
To improve reliability during operation, it is necessary to perform temporary and high-quality maintenance and current car repairs.

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