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List of the catalog of this article:

• 1, What is the reason for the engine crankshaft breakage?
• 2、 The crankshaft in the engine has been spinning wildly. Will there be wear and tear? What is its material? _Baidu...
• 5, What are the functions of the engine crankshaft? How to maintain it reasonably?
• 6, effective power noun explanation

What is the reason for the engine crankshaft breakage?

1. The reason for the engine crankshaft breakage: the precursor of the valve falling into the cylinder: the valve falling into the cylinder is generally caused by the broken valve rod, the broken valve spring, the cracked valve spring seat, the falling off of the valve lock and other reasons.

2. The reason for the failure of the engine crankshaft fracture The rounded corners at both ends of the crankshaft neck are too small. When grinding the crankshaft, the grinder failed to correctly control the rounded angle of the crankshaft. In addition to the rough arc processing, the radius of the rounded corner is also too small.Therefore, when the crankshaft is working, there is a large concentration of stress at the rounded corner, which shortens the fatigue life of the crankshaft.

3. The reasons for the crankshaft breakage are generally as follows: 1 The different centers of the center line of the main bearing cause the crankshaft to be fatigued early due to alterchange stress, resulting in a crankshaft breakage accident.

4. The reasons for the fracture of the crankshaft are generally as follows: - The center line of the main bearing is eccentric, causing the crankshaft to be subjected to alternating stress and early fatigue, resulting in the crankshaft fracture accident. - In addition to the deformation of the parts themselves, the main bearing is often caused by the improper hole of the main bearing seat during maintenance, assembly or scraping.

5. The fracture of curved uranium is mainly caused by fatigue, and most of them are manifested in the stress concentration part, that is, near the rounded corner and oil hole at the junction of the crankneck and the crank arm. The breakage of the crankshaftCracks do not appear immediately, but form cracks at the beginning. After the stress is concentrated, the cracks gradually expand, and finally lead to disconnection.

6. The reasons for the fracture of the crankshaft of the diesel engine are: the impact of unbalanced load (1) Unbalanced weight. When grinding the crankshaft, after the neck size of the connecting rod becomes smaller, the weight will be reduced compared with the original factory. (2) Unbalanced force arm.

Basic knowledge reserve about automobile engines

1. The engine fuselage group is the installation basis of various engine mechanisms, systems and some other components, and it is also a crank connecting rod mechanism and gas distribution machine. The assembly matrix of the structure, fuel supply system, cooling system and lubrication system. ( 2) Gas distribution mechanism The gas distribution mechanism is composed of valve group and valve transmission group.

2. Cylinder, 12-cylinder, 16-cylinder, of course, these engines will have L-in-line, V-type and W-type layouts respectively. As we usually see, there are basically in-line three-cylinder engines, in-line four-cylinder engines, in-line six-cylinder engines, v-type six-cylinder engines, v-type eight-cylinder engines, etc.

3. Car engine maintenance knowledgeKnow the common faults of the engine. First of all, pay attention to the maintenance of the running-in period, which is the basis for extending the service life of the engine. Be careful of the two common problems of the engine: 1) Engine wear.

4. Modern car engines mostly use four-cylinder, six-cylinder and eight-cylinder engines.

5. The engine is the heart of a car. Once the engine fails, the car often has to lie down. The economy, power, emission and environmental protection of the whole vehicle are all related to the operation of the engine. Therefore, maintaining the engine is the first task of maintaining the car.

6. Automobile Maintenance Knowledge Engine Chapter Use lubricant of appropriate quality grade. For gasoline engines, SD-SF-grade gasoline oil should be selected according to the additional devices and working conditions of the intake and exhaust system; for diesel engines, CB-CD-grade diesel oil should be selected according to the mechanical load.The requirements not lower than those stipulated by the manufacturer shall prevail.

How to check whether the crankshaft of the engine is damaged?

1. Scratches occur on the surface of the crankshaft neck, mainly caused by the impurities such as grinding grains in the gap.

2. Crack inspection: Because the stress is concentrated in the rounded corner of the axle neck and around the oil hole, it is easy to produce cracks, the existence of cracks will lead to the fracture of the crankshaft. Therefore, flaw detectors (such as magnetic particle flaw detectors, ultrasonic flaw detectors, etc.) should be used to detect whether there are cracks.

3, 1 Clean the crankshaft. After wiping it dry, support the first and last spindle necks of the crankshaft with V-shaped blocks, and put the per centimeter touch needle against the unworn part of the bearing groove on the middle spindle neck.2 Slowly rotate the crankshaft (should avoid the position of the oil hole), find out the smallest reading reflected on the percentage meter, and rotate the dial to make the table point to zero.

4. Inspection of crankshaft neck wear (1) Clean and blow dry the crankshaft to be inspected, and place it on the crankshaft support frame; (2) Select a micrometer with an appropriate range and correct the scale.

5. When idling, unplug the high-pressure wire of each cylinder or the fuel injector harness plug one by one, and check whether each cylinder of the engine is working evenly. If the engine speed decreases significantly when the high-voltage wire or injector harness plug of a cylinder is unplugged, it means that the cylinder is not working poorly, and the cylinder spark plug and injector should be disassembled and checked.

6. Therefore, it must be inspected in engine repair. Cause of failure (1) The diesel engine does not work smoothly, and the force of each axle neck is uneven.(2) The diesel engine is suddenly overloaded, causing the crankshaft to vibrate excessively. ( 3) Diesel engines often have "explosive" combustion, so that the crankshaft is often subjected to impact load.

The crankshaft in the engine has been spinning wildly. Will there be wear and tear? What is its material? _Baidu...

However, due to the huge force of these two parts, there will inevitably be a certain degree of wear during use; if the lubrication is poor or the engine load is too large, other types of damage will occur. Common forms of damage to crankshafts include shaft neck wear, cracks, ablation, bending, distortion and fracture.

But because these two parts are subjected to great force, there will inevitably be a certain degree of wear during use;If the lubrication is poor or the engine load is too heavy, there will be other types of damage. Common forms of damage to crankshafts include shaft neck wear, cracks, cauterization, bending, distortion, fracture, etc.

The main cause of crankshaft wear is poor lubrication, which may also be caused by the engine running in the high-speed zone for a long time. The crankshaft is a very important part of the engine. The crankshaft and connecting rod are the parts that transform the up and down motion of the piston into a rotating motion. The small head of the connecting rod is connected to the piston, and the large head of the connecting rod is connected to the crankshaft.

What are the functions of the engine crankshaft? How to maintain it reasonably?

1. The methods of engine maintenance are: regularly replace the oil and oil filter; keep the crankcase well ventilated; regularly clean the fuel system;Clean the water tank regularly; clean the crankcase regularly.

2. The following is the function of the crankshaft of the automobile engine: the function of the crankshaft balance weight (also known as the counterweight) is to balance the rotational centrifugal force and its torque, and sometimes it can also balance the reciprocating inertial force and its moment; when these forces and moments themselves reach balance, the balance weight can also be used to reduce the load of the main bearing.

3. To balance the unbalanced centrifugal moment of the engine, it is sometimes also used to balance part of the reciprocating inertial force, so that the crankshaft rotates smoothly. The front end of the crankshaft is equipped with timing gears, pulleys to drive fans and pumps, and starting claws, etc.

4. The function of the crankshaft is to change the thrust from the piston connecting rod into a rotating torsion force, to change the reciprocating linear motion of the piston into a circular rotation movement of the crankshaft, and then activate it through the flywheel.The torque of the machine is transmitted to the transmission system, and also drives the gas distribution mechanism and other auxiliary devices of the engine.

5. The function of the crankshaft is to bear the force from the connecting rod and convert it into a torque output through the crankshaft and drive other accessories on the engine to work. The crankshaft is subjected to the combined action of the centrifugal force of the rotating matter, the periodically changing gas inertial force and the reciprocating inertial force, so that the curved bearing is affected by the bending torsion recharge.

effective power noun explanation

1. Effective power Basic explanation: full name "engine effective power", abbreviated as "shaft power". The net output power on the engine shaft. It is the power effectively output by the engine after deducting its own mechanical friction loss and the external loss of driving other auxiliary machines.

2. Effective power refers to the power that the engine is actually used to drive the vehicle or generate power. It is obtained by subtracting the output power of the engine from the mechanical loss. The effective power of the engine is usually measured by the power generated per unit of time (such as horsepower or kilowatt). It can change according to the design and working conditions of the engine.

3. The effective power of the engine is also known as "shaft power". It refers to the net output power on the engine shaft. It is the power effectively output by the engine after deducting its own mechanical friction loss and the external loss of driving other auxiliary machines.

4. Effective power: the ratio of the power emitted by the engine at a certain speed to the maximum power that may be emitted at the same speed. The full name is "engine effective power", abbreviated as "shaft power". The net output power on the engine shaft.