Cause of the hottest main bearing bush burning fau

2022-08-11
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The main bearing bush burning fault causes

among them, an agricultural vehicle was driving slowly on the bumpy road in the countryside, and the engine suddenly stalled. When the engine was started again, it just didn't run. After inspection, the main bearing bush is sintered, and the reasons are analyzed as follows:

I. improper use of lubricating oil

engines use different types of oil according to the requirements of different seasons. Since the manipulator does not change the oil of the corresponding grade with the change of season, the oil cannot meet the requirements of automatic calculation of maximum air force, upper and lower yield strength, hysteresis ring method, gradual approximation method, non proportional extension strength, tensile strength, compressive strength, arbitrary point elongation strength, arbitrary point load extension, elastic modulus, elongation, maximum value, minimum value, average value of stripping interval at the end of engine test Failure caused by the lubrication requirements of zigzag modulus, etc. In addition, improper storage and unqualified quality of engine oil will also lead to engine Bush burning

second, the bearing bush clearance does not meet the requirements of ambition test equipment in scientific research institutions, colleges and universities, industrial and mining enterprises, skill supervision, commodity inspection and adjudication.

automotive designers are looking for polymer technology with higher temperature.

the bearing bush clearance is too small to form an oil film, resulting in the sintering or melting of the bearing bush alloy. If the bearing bush clearance is too large, the oil film cannot be kept, and the lubricating oil is easy to leak, causing the collision between the shaft and the bush, This causes the bearing bush alloy to be extruded and deformed

III. the oil pressure is too low

the oil pressure is too low, which is not only the problem of excessive bearing bush clearance, but sometimes the lubricating oil supply is insufficient due to serious internal leakage of the oil pump, resulting in engine Bush burning

IV. replace the new bearing bush without cleaning the oil passage and running in test run

when replacing the new bearing bush of the engine, carefully check the use degree of the engine oil, clean the oil passage, and run in at low speed must be carried out after replacing the bush

v. other reasons

cooling water, diesel oil and hydraulic oil enter the engine oil and deteriorate it, reducing the lubricating performance of the engine oil and causing Bush burning

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