What is an automotive crankshaft bearing assembly
The automotive crankshaft bearing assembly is a part installed on the fixed bracket of the crankshaft and cylinder block of an automotive engine, mainly serving to bear and lubricate. It usually includes two types: bearing shells and flanged bearing shells. Flanged bearing shells can not only support and lubricate the crankshaft, but also position the crankshaft axially, making the engine structure more stable .
The function of the crankshaft bearing assembly
Youdaoplaceholder0 Support and lubrication : The crankshaft bearing assembly, through its special structural design, can effectively support the crankshaft and ensure its stability and durability during high-speed operation. Meanwhile, lubricating oil forms an oil film between the crankshaft and the bearing bush, reducing friction and wear.
Youdaoplaceholder0 Reduce friction and loss : The crankshaft bearing assembly reduces energy loss by decreasing the direct friction between the crankshaft and the cylinder block, thereby enhancing the efficiency and service life of the engine.
Youdaoplaceholder0 positioning and stability : The flanged bearing bush not only supports the crankshaft but also positions it along the axial direction, ensuring the stability and accuracy of the crankshaft during operation.
The materials and manufacturing processes of crankshaft bearing assemblies
Crankshaft bearing assemblies are typically made of metal materials. Common materials include:
Youdaoplaceholder0 copper alloy : It has excellent wear resistance, thermal conductivity and fatigue resistance.
Youdaoplaceholder0 aluminum alloy : It features a light texture and excellent corrosion resistance, making it suitable for high-performance and lightweight engines.
Youdaoplaceholder0 iron alloy : It features high strength and wear resistance, and is suitable for specific application scenarios.
Youdaoplaceholder0 steel : used in high-performance engines to meet higher performance and durability requirements .
The main function of the automotive crankshaft bearing assembly is to support and fix the crankshaft, ensuring that the crankshaft will not be damaged during high-speed operation. The crankshaft bearing shells form an oil film between the crankshaft and the bearing shells, preventing direct contact between the two, thereby reducing friction and wear and extending the service life of the crankshaft .
In addition, crankshaft bearings also have the following functions:
Youdaoplaceholder0 Reduce friction and wear : The oil film between the crankshaft bearing and the crankshaft can effectively reduce friction, thereby extending the service life of the crankshaft. If the oil film breaks, the direct contact between the bearing bush and the crankshaft will cause severe wear and bearing burning phenomena .
Youdaoplaceholder0 Reduce noise : Due to the large contact area between the bearing bush and the crankshaft, the average pressure is high, and the lubricating effect of the oil film makes the operation smoother and the noise lower .
Youdaoplaceholder0 provides axial degrees of freedom : when the engine is running, the crankshaft will expand due to heat and produce a certain displacement in the axial direction. Bearing shells allow this displacement, while ball bearings may cause uneven wear and premature damage .
Youdaoplaceholder0 Rapid heat dissipation : The contact area between the bearing bush and the crankjournal is large, and the engine oil continuously circulates for lubrication, which can quickly remove the excess heat and is beneficial for the engine 's heat dissipation .
These functions of the crankshaft bearing jointly ensure the smooth operation and long-term reliability of the engine.
The main causes of faults in the crankshaft bearing assembly of automobiles include the following :
Youdaoplaceholder0 Poor lubrication : Insufficient or deteriorated lubricating oil, damaged oil pump, ruptured oil pipe, etc. can all lead to a drop in oil pressure, resulting in poor lubrication, excessive local friction, and ultimately damaging the crankshaft bearing .
Youdaoplaceholder0 Improper fit clearance : If the fit clearance between the shaft and the bearing bush is too small or too large, it will affect the lubrication effect, increase friction, and thus damage the crankshaft bearing .
Youdaoplaceholder0 Abrasive intrusion : Abrasives such as dust and metal shavings invade the alloy surfaces of the journal and bearing bush, causing abnormal scratches and wear .
Improper use of : such as cold start at low temperature, prolonged idling, and direct engine shutdown after long-term heavy load operation, etc., can all cause damage to the crankshaft bearing .
Youdaoplaceholder0 Assembly issue : Improper selection of bearing shells that do not match the original vehicle can also cause damage to the crankshaft shells .
Youdaoplaceholder0 preventive and remedial measures include :
Youdaoplaceholder0 Regularly check the lubricating oil level : Ensure that the lubricating oil is sufficient and of good quality, and change it regularly to avoid using inferior lubricating oil .
Youdaoplaceholder0 Adjust the fit clearance : Ensure that the fit clearance between the shaft and the bearing bush is within a reasonable range (generally 0.08-0.10mm) .
Youdaoplaceholder0 Correct start-up and operation : When starting in winter, first turn the crankshaft several times. After starting, let it idle until the water temperature rises above 40°C before driving .
Youdaoplaceholder0 Avoid idling for a long time and turning off the engine directly after heavy load work : After the engine has been working under heavy load for a long time, it should be allowed to idle for a period of time before turning off .
Youdaoplaceholder0 Use high-quality lubricating oil : Select high-quality lubricating oil, regularly check its quality, and replace deteriorated lubricating oil in a timely manner .
Through the above measures, faults in the crankshaft bearing assembly of automobiles can be effectively prevented and resolved, ensuring the normal operation of the engine and extending its service life.
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