Introduction to Common Synthetic Grease
Introduction to Common Synthetic Grease
2022年3月20日
Repair and Maintenance of Automobile Hub
Repair and Maintenance of Automobile Hub
2022年3月21日

Basic principles for selection and application performance of fag oil-free bearing

  • Fag oil-free bearing configuration includes not only rolling bearings, but also bearing related components, such as shaft and bearing seat. The lubricant is also a very important part of the bearing configuration, because the lubricant should be wear-resistant and corrosion-resistant, so that the oil-free bearing can play its full role. 
  • In addition, the seal is also a very important component. The performance of the seal is very important for the cleaning of the lubricant. Keeping clean has a profound impact on the service life of bearings, which is why lubricants and seals have become part of fag bearing business.Basic principles for selection and application performance of fag oil-free bearing

Basic principles for selection and application performance of fag oil-free bearing

  • 1. Select the basic type, tolerance grade and clearance of oil-free bearing according to the working conditions of bearing (including load direction and load type, speed, lubrication mode, coaxiality requirements, positioning or non positioning, installation and maintenance environment, ambient temperature, etc.);Basic principles for selection and application performance of fag oil-free bearing
  • 2. Determine the bearing model through calculation according to the working conditions, stress conditions and service life requirements of the bearing, or select the bearing model according to the service requirements, and then check the service life;Basic principles for selection and application performance of fag oil-free bearing
  • 3. Check the rated load and limit speed of the selected bearing.
  • The main factors considered in selecting fag oil-free bearing are ultimate speed, required service life and load capacity. Other factors are helpful to determine the bearing type, structure, dimension, tolerance grade and final scheme of clearance requirements.Basic principles for selection and application performance of fag oil-free bearing
  • 1. Type selection
  • All kinds of rolling bearings have different characteristics and are suitable for different applications of various machines. When selecting the oil-free bearing type,Basic principles for selection and application performance of fag oil-free bearing
  • The following factors should generally be considered. Generally, thrust bearing and angular contact bearing are selected for bearing thrust load, ball bearing is usually used for high-speed applications, and roller bearing is selected for bearing heavy radial load. 
  • In short, the selection personnel should select the appropriate type from different manufacturers and a large number of bearing products.Basic principles for selection and application performance of fag oil-free bearing
Basic principles for selection and application performance of fag oil-free bearing

 space and position of the machine occupied by the bearing

  • In mechanical design, the size of the shaft is generally determined first, and then the rolling bearing is selected according to the size of the shaft. Usually, ball bearings are used for small shafts and roller bearings are used for large shafts. 
  • However, when the bearing is limited in the diameter direction of the machine, needle roller bearings, ultra light and ultra light series ball or roller bearings are selected; When fag oil-free bearing is limited in the axial position of the machine, narrow or ultra narrow series ball or roller bearings can be selected.Basic principles for selection and application performance of fag oil-free bearing
  • • the magnitude, direction and nature of the load on the bearing
  • Load is the main factor in selecting oil-free bearing. Roller bearings are used to bear heavy loads, ball bearings are used to bear light or medium loads, and bearings made of carburized steel or bainite quenching can bear impact and vibration loads.
  • In terms of load direction, deep groove ball bearing, cylindrical roller bearing or needle roller bearing can be selected when bearing pure radial load. When bearing small pure axial load, thrust ball bearing can be selected; 
  • When bearing large pure axial load, thrust roller bearing can be selected. When the bearing bears the combined radial and axial load, angular contact ball bearing or tapered roller bearing is generally selected.Basic principles for selection and application performance of fag oil-free bearing
  • • bearing centering performance
  • When the center line of the shaft is different from the center line of the bearing seat, there is an angle error, or the rigidity of the shaft is small due to the large distance between the two supports of the shaft, which is easy to bend or tilt under force, the self-aligning ball or self-aligning roller bearing with good self-aligning performance and outer ball bearing can be selected. This type of bearing can maintain normal operation when the shaft is slightly tilted or bent.
  • The amount of work required depends on whether you have similar bearing matching experience. When there is a lack of experience, special requirements, or special consideration needs to be given to the cost of bearing configuration and any other subsequent shape, more work needs to be done, such as more accurate calculations and / or tests.
  • In the chapter following the comprehensive technical introduction, the designer of oil-free bearing configuration will see the necessary basic information provided in the order of general requirements. 
  • Obviously, it is impossible to include all the information required for every conceivable fag bearing application. For this reason, we will mention comprehensive application engineering services in many places, including technical support for correct selection of bearings and how to conduct complete bearing configuration calculation. 
  • The higher the technical requirements for bearing configuration and the more limited the experience of using bearings in specific applications, the more this service should be utilized.Basic principles for selection and application performance of fag oil-free bearing
Technical requirements for Timken non-standard bearing