What is the crankshaft group made up of in a diesel engine?

The diesel engine is composed of the engine body, two major mechanisms (crank connecting rod mechanism, air distribution mechanism), and four major systems (fuel supply system, lubrication system, cooling system, and starting system). The body is the frame that makes up the diesel engine, which is composed of the cylinder block and the crankcase. The crank connecting rod mechanism is composed of a piston connecting rod group, a crankshaft flywheel group and other parts.

The valve train is composed of a valve group, a valve transmission group, and a valve actuation group. The fuel supply system includes a fuel supply device, an air supply device, a mixture gas formation device and an exhaust gas exhaust device. The lubrication system consists of an oil supply device and a filtration device.

The cooling system includes radiators, water pumps, fans, etc. The starting system includes a starting motor or a starting internal combustion engine and a transmission mechanism.

The main components of the diesel engine generally include: the body, the crank connecting rod machine

structure, DAO gas distribution mechanism, fuel system, special lubrication system.

Cooling system, electrical system.

Supplement: The basic structure of the diesel engine includes:

Crank connecting rod mechanism, valve mechanism, transmission mechanism, fuel supply system, lubrication system, cooling system and starting system (commonly known as three major mechanisms, four major systems).

The crank connecting rod mechanism, the valve mechanism and the fuel supply system are the three basic parts of the diesel engine, and they cooperate with each other to complete the working cycle of the diesel engine and realize energy conversion.

In the process of using the diesel engine, we must pay full attention to the above parts, and can not ignore any part, otherwise, the normal operation of the diesel engine will not be guaranteed, and even cause serious damage to the diesel engine.

For modern diesel engine, on the basis of the above-mentioned basic structure, by increasing the supercharging system (increasing the intake pressure) and become a supercharged diesel engine, through the electronic control of the fuel supply system and become an electronically controlled diesel engine (including electronically controlled common rail diesel engine and electronically controlled monomer chestnut diesel engine).

The engine is composed of "two major mechanisms" and "five major systems".

Two major mechanisms: 1, crank connecting rod mechanism 2, gas distribution mechanism.

Five systems: 1. Fuel supply system 2. Lubrication system 3. Cooling system 4. Ignition system 5. Starting system.

engine.

1. Activation and function.

The engine is usually composed of a crank connecting rod mechanism, a valve mechanism, a fuel supply system, a lubrication system, a cooling system and a starting system.

1. Crank connecting rod mechanism.

The crank connecting rod mechanism is the main motion mechanism of the engine to realize energy conversion and complete the working cycle, which is composed of cylinder block, cylinder head, piston, connecting rod, crankshaft and flywheel and other parts.

2. The function of the valve mechanism is to realize the ventilation process of the engine, according to the working cycle of the engine, open and close the intake and exhaust valves regularly, so that the combustible mixture enters the cylinder, and the exhaust gas is discharged from the cylinder. The valve train usually consists of a valve train, a valve train train and a valve actuator.

3. Fuel supply system.

The function of the fuel supply system of the gasoline engine is to prepare a certain concentration and quantity of fresh combustible mixture and send it to the cylinder according to the requirements of the engine. The function of the diesel engine fuel supply system is to supply diesel and air into the cylinder respectively in a certain proportion, form a mixture in the combustion chamber and burn it, so that the engine can work continuously.

4. The function of the lubrication system is to supply a certain amount of clean lubricating oil to the friction surface of the engine moving parts. Main.

It is composed of oil pump, oil filter, pressure limiting valve and other parts.

5. Cooling systemThe function of the cooling system is to absorb and dissipate the excess heat of the heated parts of the engine to ensure that the engine works at the most suitable temperature state. It is mainly composed of water pumps, cooling jackets, radiators, fans, thermostats and other parts.

6. Ignition systemThe function of the ignition system is to generate electric sparks at the specified time and ignite the combustible mixture in the gas cylinder. It is mainly composed of ignition coils, distributors, batteries, generators and spark plugs.

7. The function of the starting system is to start the engine. The crankshaft starts to turn under the action of external force, and the process by which the engine starts to run on its own is called the starting of the engine. The starting system is mainly composed of the starter and its accessories.

The gasoline engine is composed of the above two major institutions and five major systems. The diesel engine is composed of the above two major mechanisms and four major systems, and the diesel engine is compression-ignited, so there is no ignition system.

The working process of a diesel engine is actually the same as that of a gasoline engine, and each working cycle also goes through four strokes: air intake, compression, work, and exhaust. However, because the fuel used in diesel engine is diesel, its viscosity is greater than that of gasoline, it is not easy to evaporate, and its autoignition temperature is lower than that of gasoline, so the formation and ignition of combustible mixture are different from gasoline engines.

The diesel engine sucks pure air in the intake stroke. When the compression stroke is nearing the end, the diesel fuel is injected with the oil pressure to more than 10MPa, injected into the cylinder through the injector, and mixed with the compressed high-temperature air in a very short time to form a combustible mixture. Due to the high compression ratio of the diesel engine (generally 16-22), the air pressure in the cylinder can reach at the end of compression, and the temperature is as high as 750-1000K (while the mixture pressure of the gasoline engine at this time will be 600-700K), which greatly exceeds the autoignition temperature of diesel.

Therefore, after the diesel fuel is injected into the cylinder, it mixes with the air in a very short time and immediately ignites and burns on its own. The air pressure in the cylinder rises sharply to 6-9MPa, and the temperature also rises to 2000-2500K. Driven by high-pressure gas, the piston moves downward and drives the crankshaft to rotate and work, and the exhaust gas is also discharged into the atmosphere through the exhaust pipe.

Ordinary diesel engines are driven by engine camshafts, and diesel fuel is delivered to the fuel chambers of each cylinder with the help of high-pressure oil pumps. This type of oil supply changes with the change of engine speed, and the optimal oil supply at various speeds cannot be achieved. The common rail injection system of electronically controlled diesel engine, which is now more and more commonly used, can better solve this problem.

The common rail injection fuel supply system is composed of a high-pressure oil pump, a public oil supply pipe, an injector, an electronic control unit (ECU) and some pipeline pressure sensors, and each injector in the system is connected to the public oil supply pipe through its own high-pressure oil pipe, and the public oil supply pipe plays a role in hydraulic pressure storage for the fuel injector. When working, the high-pressure oil pump delivers fuel to the public oil supply pipe at high pressure, and the high-pressure oil pump, pressure sensor and ECU form a closed-loop work to achieve accurate control of the oil pressure in the public oil supply pipe, which completely changes the phenomenon of oil supply pressure changing with engine speed. Its main features are as follows:

1. The fuel injection timing is completely separated from the fuel metering, and the fuel injection pressure and fuel injection process are controlled by ECU in a timely manner.

2. The injection pressure, the start point and duration of fuel injection of each cylinder can be adjusted according to the working condition of the engine, so as to pursue the best control point of fuel injection.

3. It can achieve high fuel injection pressure and pre-injection of diesel.

Compared with gasoline engines, diesel engines have a low fuel consumption rate (30 lower than gasoline engines on average), and diesel engines are lower**, so fuel economy is better; At the same time, the speed of the diesel engine is generally lower than that of the gasoline engine, and the torque is larger than that of the gasoline engine, but its mass is large, the noise is loud when working, the manufacturing and maintenance costs are high, and the emissions are worse than the gasoline engine. However, with the development of modern technology, these shortcomings of diesel engines are gradually being overcome, and now not high-end cars have begun to use diesel engines.

Two major systems and five major institutions.

The main components of the diesel engine generally include: the body, the crank connecting rod mechanism, the valve mechanism, the fuel system, the lubrication system, the cooling system, and the electrical system.

1. Body: It is the skeleton of the diesel engine.

2. Crank connecting rod mechanism: it is the main moving part of the diesel engine.

3. Valve mechanism: It is to open and close the intake and exhaust valves regularly.

4. Fuel supply system: according to the needs of the diesel engine, the diesel fuel is supplied to the combustion chamber for combustion at regular and quantitative intervals.

5. Lubrication system: supply lubricating oil to each moving friction pair.

6. Cooling system: It dissipates the heat generated by the diesel engine when it is working to the atmosphere.

7. Electrical system: it is auxiliary equipment for starting, lighting, monitoring and operation.

Yizhong Power Station Diesel Generator Set) diesel engine is the diesel engine used in the diesel generator set is the power output part, it uses diesel as fuel, and relies on the high temperature and high pressure air formed after compression in the cylinder to make the sprayed mist diesel combustion and expand and do work, and convert heat energy into mechanical energy. Because diesel fuel is ignited by compressed high-temperature air, diesel engines are also known as compression-ignited internal combustion engines. The diesel engine used in the diesel generator set is generally a four-stroke water-cooled high-speed diesel engine.

The so-called four-stroke diesel engine is a diesel engine that completes a working cycle in the four processes of air intake, compression, work (expansion) and exhaust.

There are many types of visual inspection machines, and the classification methods are also various, which can be divided into single-cylinder and multi-cylinder diesel engines according to the structure of the body, among which the multi-cylinder diesel engine is divided into in-line type and V-shaped arrangement type according to the different cylinder arrangement methods; According to the air intake mode, it is divided into spontaneous combustion suction type and pressurized type; According to the working cycle process, it is divided into two-stroke and four-stroke; According to the cooling method, it is divided into air-cooled and water-cooled; According to the use, it can be divided into power generation, marine, vehicle, agricultural irrigation, construction machinery and other industrial supporting diesel engines; According to the rated speed, it is divided into high speed (rated speed in more than 1000r min), medium speed (rated speed in the range of 600 1000r min) and low speed (rated speed in less than 600r min), the rated speed of the diesel engine used in the diesel generator set is generally 1500r min or 3000r min.

There are many models of generator sets in use, and the power is different, among which most of the medium and large generator sets are fueled by diesel, and the generator sets with smaller power are generally fueled by gasoline.

The diesel generator set with the diesel engine as the generator power source has several advantages compared with the gasoline generator set with the gasoline engine as the generator power source:

1. Fuel economy. The thermal efficiency of the diesel engine is high, the fuel consumption rate is low, and the fuel water pump rate curve changes relatively flat when the working conditions change, which is very important for the diesel engine that often works under partial load.

2. Reliable and durable. Since the diesel engine does not have an ignition system, there are relatively few failures and high working reliability.

3. Wide range of use.

4. Less harmful emissions.

5. Good fire safety.

The full name of diesel engine crankshaft is diesel engine connecting rod crankshaft, which is one of the main components of diesel engine, which is used to connect the connecting rod of diesel engine to the crankshaft to transmit the power of the piston. It consists of a crankshaft, a connecting rod, a connecting rod clamp and a connecting rod sleeve. The crankshaft is a metal punch rod that is bent by hand, and it rotates around the shaft of the crankshaft to transmit the power of the piston.

The connecting rod is connected to the crankshaft, and the connecting rod clamp and connecting rod sleeve are used to connect the crankshaft and connecting rod respectively.

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The full name of diesel engine crankshaft is diesel engine crankshaft bearing rotation support, which is one of the core components of diesel engine, and its main role is to convert the up and down motion generated by the piston into rotary motion, so as to drive generators or other mechanical devices. The quality and craftsmanship of the crankshaft directly affect the performance and life of the engine, so it should be very strict when manufacturing and installing. Extended Supplements:

Diesel engine crankshafts are usually made of steel, which are generally divided into two types: flat crankshafts and cross crankshafts. Plane crankshaft refers to the crankshaft where the connection line of each connecting rod shaft and the main shaft intersects at one point, and is widely used; Cross crankshaft refers to the crankshaft where each connecting rod shaft and the main shaft intersect in pairs, and its structure is more complex and the range of use is narrower. In the manufacture of crankshafts, processes such as forging, cold drawing and hot rolling are generally adopted, and then precision machining is carried out by processing equipment such as lathes, milling machines and grinding machines to ensure the accuracy and quality of the crankshaft.

Therefore, the diesel engine crankshaft is a vital component in the diesel engine, and its quality and process level directly affect the power, life and safety performance of the engine. Therefore, when using a diesel engine, it is necessary to regularly check the wear and damage of the crankshaft to ensure that it is in good working condition. <>