Plain bearings play a vital role in mechanical vehicles, and their damage can lead to a series of problems, such as wear, heat and even bite death. This article focuses on how to prevent these injuries through proper assembly and maintenance, proper use, and regular inspection to ensure efficient bearing operation.
Key words: plain bearing; Injury prevention; Assembly quality; Lubricating oil management; Periodic inspection
1. Improve assembly and maintenance standards
In order to prevent damage to the plain bearing, it is necessary to ensure that the back of the bearing bush is smooth and spotless when assembling, and has a complete positioning bump to achieve a tight fit. Reasonably set the amount of spring to ensure that the bearing can cling to the seat hole with its own elastic force. At the same time, the upper and lower ends of the bearing seat should be accurately adjusted to produce enough friction self-shrinking force after tightening the bolt, and enhance the connection tightness and heat dissipation effect. In addition, the crankshaft bearing and journal must be carefully checked before assembly to avoid stress concentration or deformation caused by improper installation.
2. Standardize the operation process
Control of operating conditions: Try to avoid long periods of engine operation under low speed and heavy load conditions, as this will lead to boundary lubrication and increase the risk of direct contact between metals.
Maintain adequate lubrication: check the oil level of the oil pan regularly and add lubricating oil if necessary. At the same time, pay attention to the quality of lubricating oil changes, timely replacement of deteriorated oil products, in order to maintain good lubrication performance.
3. Reinforce daily check-ups
The bearing is inspected in two ways: disassembly and non-disassembly. The non-disassembly inspection mainly relies on auscultation, judging bearing status according to abnormal sound; The disintegration examination is to further confirm the extent of damage after the problem is found. For the inspection of the bearing clearance of the connecting rod, it is necessary to remove the relevant parts and clean the surface of the friction reducer, and then reassemble and adjust the clearance to ensure that it meets the technical requirements.
4. Optimize the design process
The heat balance and temperature rise control of bearings should be considered in the design stage. The oil inlet hole should be located on the top of the upper bearing shell to ensure the uniform distribution of lubricating oil and reduce the risk of babbitt softening caused by temperature increase. When selecting the bearing material, it is necessary to comprehensively consider its plasticity, strength, corrosion resistance and other characteristics, and choose the most suitable material for different application scenarios, such as babbitt alloy for stable load environment, and high tin lead base alloy is more suitable for high-power engines.
To sum up, by improving the assembly quality, standardizing the operation process, strengthening the daily inspection and optimizing the design process, the damage of the plain bearing can be effectively prevented, its service life can be extended, and the safe and reliable operation of mechanical vehicles can be guaranteed.
