Classification, performance, application and troubleshooting of compressor oil
Classification, performance, application and troubleshooting of compressor oil
2022年3月21日
The Structural Type of Koyo Bearing has Different Requirements for Maintenance
The Structural Type of Koyo Bearing has Different Requirements for Maintenance
2022年3月22日

Adjustment of NSK bearing clearance

  • Even small dust that cannot be seen by the eyes will have a bad impact on NSK Bearings. Therefore, keep the surrounding clean so that the dust will not invade the bearing.Adjustment of NSK Bearing Clearance
  • Strong impact on the bearing during use will produce scars and indentation, which will become the cause of the accident. In serious cases, it will crack and fracture, so we must pay attention to it.Adjustment of NSK Bearing Clearance

Adjustment of NSK Bearing Clearance

  • Avoid replacing with existing NSK bearing tools, and appropriate tools must be used. We often emphasize the importance of tools because too many customers use the wrong tools in installation, resulting in bearing damage.Adjustment of NSK Bearing Clearance
  • On the shaft and in the bearing seat, the bearing is required to fix its position in three directions: radial, axial and tangent directions. Radial and tangential positioning is realized through tight fit of NSK bearing ring, and tight fit is adopted for axial positioning only in a few cases; Generally, axial limit parts, such as end caps and retaining rings, are used to limit the axial position within the clearance range.Adjustment of NSK Bearing Clearance
  • The following four points should be paid attention to when selecting the fit:
  • (1) The circumferential surface of the bearing ring shall have good support and uniform stress, so as to reduce deformation and give full play to the bearing capacity of the bearing.Adjustment of NSK Bearing Clearance
  • (2) The ferrule cannot slide along the tangent direction in its mating surface, otherwise the mating surface will be damaged.Adjustment of NSK Bearing Clearance
  • (3) The free end bearing must be able to adapt to the length change of the shaft and bearing seat hole, that is, it must have the ability to adapt to the swimming of the axial position within a certain range.Adjustment of NSK Bearing Clearance
  • (4) Attention must be paid to making the installation and disassembly of bearings simple, labor-saving, time-saving and cost-effective. When operating NSK Bearings, sweat on your hands can be the cause of rust. Pay attention to operate with clean hands and wear gloves as much as possible.Adjustment of NSK Bearing Clearance
  • The service life of the bearing has a very important relationship with maintenance, because it is related to the service life of the bearing and the working efficiency. Good maintenance of NSK Bearings will bring many benefits. For example, it can bring high production efficiency and produce products with higher quality and precision. Several maintenance can prolong the service life and save you the cost of re procurement.
  • 1. Adjusting gasket method:Adjustment of NSK Bearing Clearance
  • Fill a group of soft material (soft steel sheet or elastic paper) gaskets between the bearing end cover and the end face of the bearing seat; When adjusting, first install the bearing end cover without putting the gasket, tighten the screws on the bearing end cover evenly, and turn the shaft by hand until the bearing rolling element contacts the outer ring and there is no clearance inside the shaft; 
  • At this time, measure the clearance between the bearing end cap and the end face of the bearing seat, plus the axial clearance required by NSK bearing during normal operation; This is the total thickness of the gasket to be filled, then fill the prepared gasket between the bearing end cover and the end face of the bearing seat, and then tighten the screws.Adjustment of NSK bearing clearance
  • 2 adjusting bolt method:Adjustment of NSK bearing clearance
  • Press the pressure ring on the outer ring of the bearing and press it with the adjusting bolt; Before pressure adjustment, first measure the pitch of the adjusting bolt, and then slowly tighten the adjusting bolt until there is no clearance inside the bearing, and then calculate the corresponding rotation angle of the adjusting bolt.
  •  For example, if the pitch is 1.5mm and the clearance required for the normal operation of the bearing, the rotation angle required for adjusting the bolt is 3600 × 0.15/l.5=360; At this time, turn the adjusting bolt 360, NSK bearing will obtain an axial clearance of 0.5mm, and then fix it with stop gasket.Adjustment of NSK bearing clearance
  • For the flow bearing lubricated with grease, the grease shall be replaced after 1500 hours of operation, and the amount of oil added shall be appropriate, because too much or too little grease will cause bearing heating, and the amount of oil added is generally 1 / 2 ~ 2 / 3 of the volume of the bearing chamber.Adjustment of NSK bearing clearance
  • However, for NSK Bearings Lubricated with lubricating oil, the oil volume shall be added to the corresponding specified position;
  • The secondary reasons for the scratches in the process of bearing installation are: the inner ring and outer ring of NSK bearing are skewed during installation and assembly; Or it may be the emerging rush load in the process of installation and assembly, which will eventually form the scar of bearing.Adjustment of NSK bearing clearance
  • When installing the bearing, it shall be stopped according to the working specifications, and many achievements will not be formed. If the form or method of the device is not appropriate, linear scars will be formed on the raceway surface and bone surface of NSK bearing. The device of deep groove ball bearing indirectly reflects the precision, service life and function of the bearing.
  • Although the bearing quality and other aspects are relatively good, the rolling bearing is a precision component, and its use must be carried out carefully accordingly. No matter how high-performance bearings are used, if they are not used properly, the expected high performance will not be obtained. The precautions for the use of NSK Bearings are as follows:
  • (1) Keep the bearing and its surroundings clean.
  • Even small dust that cannot be seen by the eyes will have a bad impact on NSK Bearings. Therefore, keep the surrounding clean so that the dust will not invade the bearing.
  • (2) Use with care.
  • Strong impact on the bearing during use will produce scars and indentation, which will become the cause of the accident. In serious cases, it will crack and fracture, so we must pay attention to it.
  • (3) Use proper operation tools.
  • Avoid replacing with existing tools, and appropriate tools must be used.
  • (4) Pay attention to the corrosion of bearings.
  • When operating NSK Bearings, sweat on your hands can be the cause of rust. Pay attention to operate with clean hands and wear gloves as much as possible.
  •  
Adjustment of NSK Bearing Clearance
  • Generally speaking, in order to control the noise impact of NSK Bearings, countermeasures must be taken against the root causes of these noises in order to achieve a permanent cure. The main approaches are:
  • (1) Choose low noise cylindrical roller bearing;
  • (2) Avoid resonance with the host and avoid resonance sensitive speed;
  • (3) Try to eliminate the noise from the application of cylindrical roller bearing;
  • (4) When other methods are ineffective, additional measures of sound insulation and silencing shall be taken.
  • When the temperature of NSK bearing rises, first judge whether there is misoperation. If it does rise, the following treatment shall be carried out:
  • Check whether the cooling water pressure, water flow and pipeline system are normal. If the water pressure is low, the filter may be blocked and cannot be handled in time, it can be shut down for treatment. When it is confirmed that it can work, it can be put into use.
  • Check the oil pressure of the governor. If the oil pressure is low, the cooling water hydraulic valve may be closed.
  • Check whether NSK bearing has abnormal sound and whether the swing of cylindrical roller bearing is abnormal.
  • Take an oil sample to observe whether the oil color has changed, and test to see whether it has deteriorated. If the deterioration is confirmed, stop the machine and replace it with new oil.
  • Check whether the oil level of the oil gauge is normal. If not, check whether the oil drain valve of the oil tank is tightly closed. If it has been closed tightly, oil shall be added. If it is oil leakage from the sealant pad, it shall be shut down for treatment.
Technical requirements for Timken non-standard bearing