What does "automobile connecting rod bearing" mean
Youdaoplaceholder0 automotive connecting rod bearing refers to the component installed at the connection point between the big end of the engine connecting rod and the crankshaft. It mainly serves to reduce wear, provide support and positioning, facilitate transmission, and assist in heat dissipation. The connecting rod bearing is usually made of high-hardness wear-resistant steel and is divided into two parts, namely the upper bearing of the connecting rod and the lower bearing of the connecting rod. They are designed through oil tanks and oil passage holes to ensure proper fuel supply during engine operation, achieving cooling and optimal fuel supply .
Structure and Material
The connecting rod bearing is composed of a steel back and an anti-friction alloy layer. The steel back is generally made by rolling high-quality low-carbon steel strips, with a thickness ranging from 1mm to 3mm, while the thickness of the anti-wear alloy layer is between 0.3mm and 0.7mm. Common anti-wear alloy materials include white alloys, steel-lead alloys, aluminum-based alloys or high-tin aluminum alloys, etc. These materials can effectively reduce wear and extend service life .
Function and Role
Youdaoplaceholder0 Reduce wear : The connecting rod bearing can reduce the friction between the big end of the connecting rod and the connecting rod journal, lower energy loss and improve engine efficiency .
Youdaoplaceholder0 Support and positioning : It also undertakes the functions of support and positioning to ensure the accurate movement of the connecting rod .
Youdaoplaceholder0 Auxiliary heat dissipation : The connecting rod bearing can transfer the working heat to the big end of the connecting rod, ensuring effective heat dissipation and preventing local overheating from causing damage to the components .
Youdaoplaceholder0 Precise fuel supply : The design of the oil groove and oil passage hole on the connecting rod bearing ensures that the piston is properly supplied with fuel during engine operation, achieving cooling and the optimal fuel supply volume .
Installation and maintenance
When installing the connecting rod bearing, it is necessary to pay attention to the fact that the upper and lower marks are not correct, the direction of the bearing mouth is not reversed, and the screw needs to reach the corresponding torque. These detailed designs can ensure that the connecting rod bearing is in a reasonable position during assembly, avoiding the heavy-load force area, and further reducing wear .
The functions of the automotive connecting rod bearing mainly include the following aspects :
Youdaoplaceholder0 Reduce wear : The connecting rod bearing is installed at the connection between the connecting rod and the crankshaft. Its main function is to provide friction protection when the connecting rod or crankshaft rotates at high speed, reducing wear. The connecting rod bearing is made of high-hardness wear-resistant steel and is divided into the upper connecting rod bearing and the lower connecting rod bearing. It is attached to the connection part between the connecting rod and the crankshaft, reducing direct friction and extending the service life of the components .
Youdaoplaceholder0 Support and positioning : The connecting rod bearing not only supports and fixed the connecting rod and crankshaft, but also ensures that the connecting rod bearing is in a reasonable position during assembly through the positioning protrusions in its design, avoiding the heavy-load force area and further reducing wear. This design enables the connecting rod bearing to work stably during engine operation, reducing vibration and noise .
Youdaoplaceholder0 Auxiliary heat dissipation : The design of the connecting rod bearing also includes special structures such as oil grooves and positioning protrusions. These designs not only reduce friction but also help the engine dissipate heat through the fuel supply cooling function, avoiding damage to components caused by local overheating .
Youdaoplaceholder0 Enhance efficiency : By reducing friction and providing stable support, connecting rod bearing shells can lower energy loss and improve the overall efficiency of the engine. In addition, the reasonable design and assembly of the connecting rod bearing can also ensure the stable operation and efficient work of the engine .
The main symptoms of car connecting rod bearing failure include abnormal noise, decreased oil pressure, engine shaking and reduced power . Specifically, when the engine is idling, a short "clanging" sound can be heard. As the speed increases, the sound becomes more pronounced. If you remove the oil filling cap and listen, you will hear a clear "clang clang" sound, which indicates that there is a problem with the connecting rod bearing .
In addition, the oil pressure gauge shows a drop, and there is a loud noise on the side of the engine oil pan, which are also signs of a faulty connecting rod bearing .
The main causes of connecting rod bearing failure include excessive wear, alloy layer shedding and loose connecting rod bolts . Excessively worn connecting rod bearing shells can lead to an increase in looseness, preventing normal operation and thereby affecting engine performance. The shedding of the alloy layer of the connecting rod bearing bush can cause bearing alloy particles in the engine oil or on the oil pan wall. This requires the replacement of a new connecting rod bearing bush and the inspection of whether the connecting rod journal is damaged . If the connecting rod bolt is loose, it will also cause the connecting rod bearing to fail. At this time, the bolt should be tightened as per the regulations .
Youdaoplaceholder0 The methods for diagnosing faults in connecting rod bearing include the following :
Youdaoplaceholder0 auscultation during idle operation : During idle operation, pay attention to whether there is any abnormal noise. As the speed increases, see if the noise becomes more obvious.
Youdaoplaceholder0 Remove the oil filler cap and listen : Remove the oil filler cap and listen for a clear "clanging" sound.
Youdaoplaceholder0 single-cylinder off-fire test : Conduct off-fire tests on each cylinder one by one. If the sound of a certain cylinder weakens or disappears when it is off-fire, but immediately reappears when it is re-ignited, it can be determined that the connecting rod bearing bush of that cylinder is making a noise of .
Youdaoplaceholder0 Check the engine oil and oil pan : Drain all the engine oil, remove the oil pan for inspection. If there are bearing alloy particles in the engine oil or on the oil pan wall, it indicates that the alloy layer of the connecting rod bearing bush has fallen off .
Youdaoplaceholder0 the methods for repairing the fault of the connecting rod bearing include the following steps :
Youdaoplaceholder0 Replace worn or fallen connecting rod bearing : If it is found that the connecting rod bearing is excessively worn or the alloy layer has fallen off, a new connecting rod bearing should be replaced and the connecting rod journal should be inspected for any damage .
Youdaoplaceholder0 Check and tighten the connecting rod bolts : if the connecting rod bolts are loose, they should be tightened as specified .
Youdaoplaceholder0 Check and replace the excessively worn connecting rod bearing : push and pull the connecting rod cover up and down with your hand. If you feel a large amount of looseness, it indicates that the connecting rod bearing is excessively worn and should be replaced with a new one .
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