Technical analysis of engine sliding NSK bearings

An engine of sliding NSK bearings have a lot of kinds, bushing or bearing NSK bearings are sliding. In order to ensure the accuracy of the engine running, the sliding NSK bearing running clearance requirements are very high. Engine NSK bearing sliding the cause of the problem can be rooted in: lubricating critical state and damage caused by running clearance of any interference and destruction of the oil film of any material. Such as inaccurate, parts to install a knock against damage and poor cleanliness, using method is not correct, harmful chemical reaction and so on, will cause the damage of the sliding NSK bearings. According to the United States cummins engine fault analysis in statistics, the main cause of NSK bearing damaged sliding has four aspects. The four aspects respectively, the percentage of failure are as follows: 1, the damage caused by clean is 45%; 2, due to the lubrication, damage is 25%; 3, due to the use, installation of damage was 15%; 4, because the surface reaction, and other aspects of damage caused by 15%. We can see from the statistical ratio, cleanliness of NSK bearings as the main reason for the damage caused. To prevent the damage caused by the poor cleanliness of work is various: when the engine assembly to ensure the purity of the parts is only one aspect, on the other hand is in use process engine. Operators and maintenance men must be in accordance with the provisions, the proper use of timely maintenance inspection, especially in dusty and chemical raw materials for a long time work under the environment of the engine, be sure to take measures to prevent the erosion of dust and chemicals, to ensure the service life of engine. Engine spindle watts, connecting rod of the soft surface alloy layer, load bearing, the biggest and the most easy to damage, so the following to the main shaft and connecting rod surface damage phenomenon, analysis the reason, in order to avoid fault recurrence after repair. One, for cleanliness problems caused by the failure: 1, tiny particles caused by foreign body for bearing abrasion: when the oil filter and engine oil pan drain plug, the first flow of dozens of ml of oil, with the naked eye can directly see and more alloy powder, bearing mill has already been hurt. This is due to the small particles of impurities into the bearing alloy layer caused by the movement of the surface, while the bearing bush did not cause serious damage, but if this kind of phenomenon continues, not only bearing early damage, shaft can also severely damage, so must be based on the cause of failure in a timely manner to eliminate, avoid to cause the damage of the parts. After troubleshooting the service life of the engine bearings cannot according to the normal wear the use time of calculation, because in a tiny particles of abnormal wear is equivalent to 2500 hours of wear is engine normal use. Small particles into the reasons: one is the air filter of the filtration effect is poor or sealed air intake system, check the air intake system inlet pipe and joint, presence of rupture and loose, at the same time look for broken filter without looseness, paper core. Whether repair or maintenance of the air intake system inspection is very