What do you mean by two major institutions and six major systems of automobiles?

2 major mechanisms and 5 major systems: crank-connecting rod mechanism; Cam valve train; Fuel supply system; Cooling system; Lubrication system; Ignition system (gasoline engine); Start the system.

1. The function of crank-connecting rod mechanism is to provide a burning place, and to convert the expansion pressure of the gas generated on the piston top after fuel combustion into the torque of crankshaft rotation, and continuously output power.

(1) converts the pressure of gas into the torque of crankshaft.

(2) Convert the reciprocating motion of the piston into the rotary motion of the crankshaft.

(3) The force of combustion acting on the piston crown is converted into the torque of the crankshaft, and the mechanical energy is output to the working machine.

2. The cam valve train regularly opens and closes the intake valve and exhaust valve of each cylinder, so that fresh combustible mixture (gasoline engine) or air (diesel engine) can enter the cylinder in time, and waste gas can be discharged from the cylinder in time.

3. Cooling system: generally composed of water tank, water pump, radiator, fan, thermostat, water thermometer and drain switch. There are two cooling methods for automobile engines, namely air cooling and water cooling. Generally, automobile engines are mostly water-cooled.

4. Lubrication system: The engine lubrication system consists of oil pump, filter screen, oil filter, oil circuit, pressure limiting valve, oil gauge, pressure sensitive plug and dipstick.

5. Fuel system: The fuel system of a gasoline engine consists of a fuel tank, a gasoline meter, a gasoline pipe, a gasoline filter, a gasoline pump, a carburetor, an air filter and an intake and exhaust manifold.

Extended data:

The overall basic structure of the car:

1, engine

Engine is the power device of automobile, which consists of crank-connecting rod mechanism, valve train, cooling system, oil supply system, lubrication system, ignition system and starting system and five systems, but diesel engine has one less ignition system than gasoline engine.

2. Chassis

The chassis consists of transmission system, running system, steering system and braking system.

The function of the chassis is to support and install the assembly of the automobile engine and its components, form the overall shape of the automobile, and accept the power of the engine to make the automobile move and ensure the normal running. The chassis consists of five parts: transmission system, running system, steering system, suspension system and braking system.

Step 3: body

The car body is installed on the frame of the chassis for drivers and passengers to ride or load goods. The body of passenger cars and buses is generally a whole structure, and the body of freight cars is generally composed of cab and cargo box.

Automobile body structure mainly includes: body shell (body in white), doors, windows, front sheet metal parts, interior and exterior decorative parts and body accessories, seats, ventilation, heating, air conditioning and so on. Trucks and special vehicles also include trucks and other equipment.

4. Electrical equipment

Electrical equipment consists of power supply and electrical equipment. The power supply includes storage battery and generator; Electrical equipment includes the starting system of engine, the ignition system of gasoline engine and other electrical equipment.

5. tires

Tire is one of the important parts of automobile, which directly contacts the road surface, together with automobile suspension, can reduce the impact of automobile driving and ensure the automobile has good riding comfort. Ensure the good adhesion between the wheels and the road surface, and improve the traction, braking and passability of the car; Bearing the weight of the car, people pay more and more attention to the important role of tires in the car.

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