Analysis of the sliding (smooth) bearing of the initiator

Source: China Bearing Network Time: 2014-08-17

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There are many types of sliding NSK bearings on an initiating machine; both the bushings and the bearing bushes are attributed to the sliding NSK bearings. In order to ensure the accuracy of the starting machine, the operating clearance requirements of these sliding NSK bearings are also very high. Initiator sliding bearings The cause of the problem can be attributed to: smooth critical state and any disturbances that cause damage to the working space and any material that damages the oil film. For example, the device is not precisely adjusted, the parts are bumpy and poorly hygienic, the application method is incorrect, and the harmful chemical reaction Etc; will lead to the damage of the sliding bearing. According to the United States Cummins initiated machine analysis of the book accounting; the main reasons for the formation of sliding bearing damage are four aspects. The four percentages of the four aspects are as follows:
1. The damage caused by hygiene is 45%.
2, due to the damage caused by the smooth side is 25%,
3, due to the application and equipment damage is 15%,
4. The damage caused by external reaction and other aspects is 15%.
From this accounting ratio, we can see that the damage caused by the degree of hygiene is the main reason. Avoiding the damage caused by the poor hygiene is multi-faceted: to ensure the sanitation of the parts only when it is assembled; On the other hand, the initiator is in the process of operation. Operators and repairers must correctly use the timely protection view according to the rules; especially the initiators who work in the dusty and chemical raw materials environment for a long time; must adopt the method Avoid dust and chemical gas corrosion; ensure the service life of the initiator. The outer bearing alloy layer of the spindle and the connecting rod in the initiator is the softest; the load is the largest; the simplest damage; so the following is the main bearing and connecting rod The appearance of the tile is damaged; the cause of the analysis; to avoid repeated problems after the correction.
First, the problems caused by the hygiene problem:
1. Wear of small particle foreign matter on bearing pad formation:
When the oil filter element is in the oil drain plug of the engine oil bottom; the first few oils flowing out of the oil; the naked eye can be directly seen and more alloy powder; the bearing bush is now worn. This is due to the small size The impurities of the particles enter the movement of the bearing layer of the bearing shell; although the bearing bush does not form severe damage; however, such an image continues to develop; not only the early damage of the bearing bush; the shaft is also severely damaged; therefore, it is necessary to rely on the disease The reason for the timely removal; avoid the damage of the formed parts. The service life of the starter bush after the fault is removed cannot be calculated according to the normal wear time; because the abnormal wear of a small particle is equivalent to the normal wear of the machine for 2500 hours. .
The reason for the entry of fine particles is as follows: First, the filter function of the air filter is poor or the sealing of the air intake system is not good; the pipelines and joints of the intake system should be checked; whether there is a break or looseness; whether the filter element is loose or not, Whether the paper core is broken or not. Whether it is repair or protection is the protection of the entire air intake system is very important; it is necessary to ensure reliability. Second, after the smooth oil is contaminated, participate in the launching machine or the oil and the filter element is used for a long time. Blocked; so that the oil of each smooth appearance will enter directly without filtering. Therefore, pay attention to the hygiene of the oil when adding smooth oil; equip the necessary filtering machine; replace the smooth oil and filter element in time according to the application rules. If the fuel supply is too large, the incineration will not end, and the nozzle will leak; the fuel will enter the crankcase; together with some impurities, the fuel will enter the crankcase and the oil will mix together to reduce the smoothing effect. Therefore, the initiator should pay attention to the investigation of the initiator. Exhaust smoke and operating conditions; if there is an abnormality, it is necessary to promptly check the reasons for correction or replacement. Fourth, when the engine is assembled; the internal parts are poorly sanitized. When starting the machine; must pay attention to the hygiene of the parts; the device should pay attention to avoid re-contamination; ensure the internal hygiene of the device.

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