Structure of diesel engine

Diesel engine consists of engine block, two major mechanisms (crank-connecting rod mechanism and valve train mechanism) and four major systems (oil supply system, lubrication system, cooling system and starting system). Engine cylinder block is the frame of diesel engine, which consists of cylinder block and crankcase. The crank-connecting rod mechanism consists of piston connecting rod group, crankshaft flywheel group and so on.

1. Engine is an engine that burns diesel oil to release energy. It was invented by German inventor Rudolf Dissel in 1892. In memory of this inventor, the Diesel engine is represented by his surname diesel, which is also called diesel engine.

2. The advantages of diesel engine are large torque and good economic performance. The working process of diesel engine has many similarities with that of gasoline engine, and each working cycle has to go through four strokes: intake, compression, work and exhaust. However, because the fuel used by diesel engine is diesel, its viscosity is higher than that of gasoline and it is not easy to evaporate, but its auto-ignition temperature is lower than that of gasoline. Therefore, the formation and ignition mode of combustible mixture is different from gasoline. The main difference is that the mixture in the cylinder of diesel engine is compression ignition, not ignition.

3. When the diesel engine is working, air enters the cylinder. When the air in the cylinder is compressed to the end, the temperature can reach 500-700℃ and the pressure can reach 40-50 atmospheres.

4. Features of traditional diesel engines: good thermal efficiency and economy. Diesel engines use compressed air to raise the air temperature, so that the air temperature exceeds the auto-ignition point of diesel. At this time, diesel oil, diesel spray and air are all sprayed and ignited by themselves.

5. Because of the high working pressure, the diesel engine requires high structural strength and stiffness of all related components, so the diesel engine is large and bulky; The fuel injection pump and nozzle of diesel engine require high manufacturing accuracy, so the cost is high.

reference data

Baidu Encyclopedia: /item/ diesel engine /6308737? Fromtitle= diesel engine &; Fromid = 475904 & ampFr = Aladdin Baidu Encyclopedia