1. The basic structure of a car consists of four parts. These four parts are: engine, chassis body and electrical equipment.
Two. Four-stroke gasoline engine is composed of engine block, crank-connecting rod mechanism, valve train cooling system, lubrication system, fuel system and ignition system (diesel engine has no ignition system).
3. The working process of four-stroke gasoline engine is divided into four processes: intake, compression, operation and exhaust. The four-stroke engine completes these four processes in four strokes when the piston moves up and down.
4. The function of engine block and crank-connecting rod mechanism is to convert the pressure of gas acting on the piston top when fuel is burned in the cylinder into the torque of crankshaft through the connecting rod, so that the crankshaft drives the working machine to do work. The main components of engine block and crank-connecting rod mechanism are cylinder block, cylinder head, piston, connecting rod, crank and flywheel.
5. The function of the valve train is to open and close the intake and exhaust valves in time according to the needs of the work, introduce combustible gas into the cylinder, and discharge waste gas in time. At the same time, it drives the distributor, gasoline pump and other components to work. The main components of the valve train include: intake valve, exhaust valve, camshaft transmission parts, etc.
6. The function of the cooling system is to dissipate the heat of high-temperature parts into the atmosphere to keep the engine working at normal temperature. Water cooling system is generally composed of engine water jacket, water pump, radiator, fan, thermostat, water thermometer and drain switch.
Seven. The normal working temperature of water-cooled engine should be 80-90 degrees. Take Jiefang CA 10B car as an example for engine temperature. According to the engine temperature, we can pull out (that is, open) or push out (that is, open and close) the shutter operating handle in the cab, and change the amount of air entering the radiator, thus adjusting the engine temperature.
8. The function of lubricating oil: lubricate all friction parts, reduce friction resistance and power consumption. Cooling effect: oil circulates, which can take away the friction belt. Reduce the temperature of parts. Cleaning function: wash away impurities on the surface of machine parts to reduce wear and tear. Sealing function: keeping the oil layer between the piston and the cylinder wall can increase the sealing performance.
9. Observe the oil pressure gauge on the dashboard of the cab: the normal oil pressure of the gasoline engine is 200-500 kPa；; Diesel engine 600- 1000 kPa.
10. The structure of carburetor can be divided into five devices: starting device; Idling device; Medium load equipment; Full load device; Accelerator. The function of carburetor is to vaporize gasoline according to the needs of engine in different situations, and mix it with air in a certain proportion to form combustible mixture. Timely and appropriate into the cylinder.
Extended information, strong demand for automobile maintenance technicians? It is urgent to build a high-quality training system.
People's Daily Online Beijing 65438+1October 20th (Yan Feng) 65438+1October19th morning, a meeting on the training system of high-quality automobile maintenance technicians was held in Beijing. Huaqi Group, Jinyu Airlines and CCID.com reached a strategic cooperation agreement at the meeting, which will improve the industrial chain of talent training in the automotive aftermarket industry in the future and bring new ideas and operation modes to the training of automobile technicians.
Wei Tongwei, chairman of Huaqi Group, also believes that the automobile aftermarket industry in China has reached 800 billion yuan every year, and it is still developing at a high speed with an annual growth rate of 30%. However, at present, the main market players in China's automobile aftermarket are small and scattered, and the whole industry has not formed perfect unified standards and industry norms, which greatly restricts the pace of market development.
The realistic demand of automobile aftermarket urgently requires the establishment of talent training mode and system. Therefore, China Automobile Group will provide the hardware equipment and venue environment needed for professional training, introduce the aviation talent training system of Jinyu Airlines and the Internet+education platform of CCID, and jointly build a high-quality, standardized training system for aviation-class automobile maintenance technicians, improve the quality and increase the development of the automobile aftermarket.
In addition, the establishment of training courses and training platforms is an important carrier, and the internet plus platform provides the greatest convenience and the best opportunity for this. Liu Xingbo, president and editor-in-chief of CCID.com, expounded the advantages and resources of CCID.com's platform ... In the future cooperation, CCID education platform will provide online course services for training, which will save training manpower, material resources and time costs and make management simpler and more flexible.
It is reported that in the future, the three parties will carry out more cooperation in the fields of aviation innovation and application, automotive aftermarket innovation and incubation, and promote the gradual improvement of professional norms in the auto repair industry.
Reference materials? People's Network-auto channel