Key requirements for grease filling during lubrication of FAG thin-walled bearings

For sealed thin-walled bearings, the production has been filled in with the appropriate grease and the seal is placed on the main unit to prevent grease leakage. Note that too little fat is likely to cause a lack of fat or dry friction, affecting life. Grease can cause excessive temperature rise. A large amount of grease leaks, not only pollutes the environment, but also wastes. Therefore, better FAG bearings are required to enter the thin-wall bearing grease amount to ensure adequate lubrication.

Lubrication friction: A resistance to mechanical friction that forms part of the surface of the film. Cooling temperature: Take away heat through oil circulation to prevent sintering. Clean: Clean the friction surfaces of the work surface and other materials produced by the metal by flowing oil. Sealed against leaks: reduces gas leakage and external contaminants. Corrosion: Adsorbs on the surface to prevent water, air, acids, harmful gases and contact areas. Buffer: A sharp rise, engine cylinder pressure, sudden increase in the piston, piston pin, connecting rod and crankshaft oil load can withstand the impact load buffer.

Grease lubrication refers to the direct application of grease between the moving surfaces of thin-walled bearings. However, the following five principles must be observed when entering grease into the raceway and sliding work surface of FAG bearings:

(1) Grease must penetrate the working surface of the thin-walled bearing and the internal clearance of the bearing, so that the grease can fully lubricate.

(2) A certain amount of grease should be retained on the working surface of the FAG bearing for a certain period of time, but it is necessary to prevent excessive loss of grease.

(3) The flow direction of the input and discharge of grease should be consistent with the sealing requirements, which is conducive to the discharge of invading dirt.

(4) Under the premise of ensuring good lubrication, minimize the amount of grease.

(5) Open the outlet hole at the end of the grease flow so that the newly added grease can squeeze out the old grease and ensure good lubrication. Special reminder, when lubricating grease for FAG bearings, pay attention to the operating temperature range of thin-wall bearing grease. If it is not in the proper temperature range, the effect will be counterproductive.

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Master the key technologies for common maintenance of FAG flange bearings

Under normal conditions, flanged bearings will naturally rise in temperature after lubrication or relubrication and last for one to two days. Stiffness and performance vibration of flange bearings are sensitive to damage of FAG bearings. For example, peeling, indentation, rust, cracks, wear, etc. are reflected in the vibration measurement. Therefore, by using a special flange bearing flange vibration measuring device (Frequency analyzer, etc.) can measure the magnitude of the vibration, and the specific situation of the abnormality cannot be inferred by the frequency division. The measured values ​​differ depending on the conditions of use or the location where the sensor is mounted. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.

The temperature of the flange bearing is generally estimated by the temperature of the outdoor surface. If the oil hole can directly measure the temperature of the outer ring of the flange bearing, it is more suitable.

Usually, the temperature rises slowly as the flange bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the flange bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the FAG bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.

The thermal sensor can be used to monitor the working temperature of the bearing at any time, and to automatically alarm or stop when the temperature exceeds the specified value, the high temperature is often indicated to indicate that the bearing is in an abnormal condition. High temperatures are also harmful to FAG bearing lubricants. Sometimes bearing overheating can be attributed to the lubricant of the bearing. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce bearing life. Causes of high temperature Qingdao flange bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, flange bearing damage, insufficient clearance, and high friction caused by oil seals.

The periodic measurement of the flange bearing temperature can be performed by means of a thermometer, such as a digital thermometer, which can accurately measure the FAG bearing temperature and display it in °C or Fahrenheit. The importance of the bearing means that when it is damaged, it will cause the equipment to stop. Therefore, it is better to install a temperature detector.

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