pipe is loose and clean the fuel tank vent pipe in a timely manner.Reasons and treatment of oil leakage in motor self-aligning roller bearings

During the use of high-power motors, frequent oil leakage occurs, which is significantly manifested in the oil leakage of the self-aligning roller bearing structure. During maintenance and repair, the possible causes of oil leakage in the motor are analyzed, and the following solutions are proposed.

1. The pressure difference between the inside and outside of the self-aligning roller bearing is large. Forced lubrication of bearing shells, the lubricating oil itself has a certain pressure, and during the operation of the shaft, the oil will produce bubbles, resulting in a certain pressure. During operation, the motor generates a certain negative pressure due to the action of the fan, which increases the pressure difference inside and outside the oil chamber, leading to oil leakage. In order to balance the pressure difference inside and outside the oil chamber, a ventilation pipe is installed between the oil chamber and the outside for pressure balance. However, blockage may occur during use, causing an increase in pressure inside the oil chamber and resulting in oil leakage.

Solution: Regularly check if the balance 

2. Inadequate oil pressure adjustment leads to poor oil return. Excessive or insufficient oil pressure can cause poor oil return. The low oil pressure causes the oil to stay in the oil chamber for too long, leading to an increase in temperature during the operation of the shaft, resulting in oil mist and excessive pressure; Excessive oil pressure will result in insufficient oil return capacity, leading to excessive oil storage in the oil chamber and an increase in internal pressure due to high oil level.

Solution: Adjust the forced lubrication pressure to 0.1-0.8MPa, so that the oil level in the oil chamber is at the position of 1/2 to 1/3 of the sight glass, and it is advisable to keep the return oil unobstructed.

3. Unreasonable design of the oil return pipeline can also lead to poor oil return, resulting in an increase in pressure inside the oil chamber. Impurities in the return oil pipeline or unclean cleaning in the pipeline can cause clogging of the filter, resulting in poor return oil flow.

Solution: The outlet of the oil chamber in the return oil pipeline should be on the same horizontal plane as the inlet, and the entire return oil pipeline should be inclined at a 15 ° angle to the return oil tank, so that the return oil pipeline can naturally return oil. At the same time, the filter and the entire lubricating oil pipeline should be cleaned regularly.

4. The contact surface between the floating palace and the shaft is severely worn due to prolonged friction, resulting in excessive clearance between the palace and the shaft; The elastic coefficient of the fixed spring for the floating palace seal changes, causing the floating palace seal to loosen and leading to an increase in clearance.

Solution: Regular inspection and timely replacement.

5. The wear of the contact surface between the sealing oil baffle and the shaft causes excessive clearance; The return oil hole in the sealed oil baffle is too small or blocked by impurities, which cannot meet the actual return oil volume.

Solution: Replace the sealing oil baffle and modify it. Change the material of the contact surface between the sealing oil baffle and the shaft to wear-resistant material; Increase the oil return hole to meet the actual oil return needs (not too large).

6. During the installation process of self-aligning roller bearings, the sealing between the upper and lower tile covers of the bearing box and the sealing between the oil baffle and the oil chamber were not properly handled; Long term operation leads to loosening of fastening bolts, aging and deterioration of sealant, resulting in poor sealing.

Solution: During the reinstallation process, use high-performance and reliable sealant on the contact surface, and apply it evenly and appropriately. When reinstalling, be sure to clean the original sealant before applying new sealant.

7. The change of oil quality causes more and more foam in the oil. In the whole lubrication system, foam occupies more operating space, which leads to the increase of oil pressure in the oil chamber, and the large pressure difference leads to the oil escaping from the shaft gap in contact with the floating palace seal and seal oil baffle.

Solution: Regularly inspect and analyze the lubricating oil, and replace it promptly if there are any problems with the oil quality.

The analysis of the causes of oil leakage in the self-aligning roller bearings of the above-mentioned motors and the solutions have achieved certain results in practical application, ensuring the safe and stable operation of the unit.