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Diesel engine bearing burning avoidance method (1)
Source: China Bearing Network Time: 2014-07-08
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Early damage of sliding bearings is much more common than bearing incineration; therefore, it is important to avoid early damage of sliding bearings. Correct protection of sliding bearings is an effective way to reduce early damage of bearings; it is also a reliable guarantee for the life of extended bearings. Therefore; Protection and repair; it is necessary to pay attention to the appearance of the bearing's alloy appearance, reverse surface, end and marginal edge; if there is an abnormal display of half-wearing signs; it is necessary to carefully find out the reasons; and adopt the corresponding method; improve the bearing Working conditions; focus on the early damage to the sliding bearings.
1 Strict measurement of the coaxiality and roundness of the main bearing bore of the diesel engine body. On the measurement of the coaxiality of the main bearing bore of the machine body; it is necessary to measure the coaxiality scale of the diesel engine body more accurately; together measure the runout of the crankshaft; The thickness of the optional bearing bush; the oil-running gap reaches the common position in each axial position. Where the diesel engine has been subjected to the condition of rolling, flying, etc.; it is necessary to detect the coaxiality of the main bearing hole of the body before assembling; the full length of the ductile iron crankshaft Not more than 0. 14mm; the total length of the steel crankshaft is not more than 0. 12mm; together with the roundness of the body bearing hole; cylindricity is also required. If it exceeds the limit, it is disabled; if it is within the limit; then the grinding method is adopted (that is, in the bearing bush) The upper part is coated with excess red powder; after the crankshaft is loaded, the transformation is carried out; then the bearing cap is removed to view the bearing bush; after the hard spot protruding portion is scraped, the amount of change is measured; thereby ensuring the reliability of the application.
2 improve the repair and installation quality of the bearing; strictly control the passing rate of the connecting rod on the connecting rod. Improve the quality of the hinge of the bearing; ensure that the bearing on the opposite side of the lubrication is not mottled; the positioning bump is intact, and the amount of the opening is 0. 5~1. 5mm; this ensures that the rear bearing bush of the device is tightly attached to the bearing housing hole by its own elastic force, and the parallel and degree of twisting of the new and old connecting rods are required; the unacceptable connecting rod is stopped and mounted in the bearing housing. Each end of the upper and lower bearing bushes should be 30~50mm higher than the bearing seat plane; the high output can ensure the tight cooperation between the bearing and the bearing seat after tightening the bearing cap bolts according to the regular torque; the self-locking force of the conflict is satisfied; the bearing is not loosened. ; heat dissipation is good; avoid bearing ablation and wear, the working surface of the bearing can not be measured by the scraping method to reach 75% to 85% touch impression; the cooperation gap between the bearing and the journal should be reached when not scraping In addition, the device should pay attention to the processing quality of the crankshaft journal and the bearing; strictly implement the repairing process standard; avoid the formation of the device is not correct due to improper loading method and the torque unevenness or not of the bearing bolt Bonding rules; then being bent and deformed stresses set; lead to early damage of the bearing.
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