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The factors must be considered when selecting bearings (7-9)

Various types of bearings have different characteristics due to different designs. Due to the variability and complexity of the specific mounting position of the bearing and the application, there is no fixed mode to choose the bearing type. In order to adapt to the specific installation position and application conditions of a certain host, when selecting the bearing type, it is recommended to consider the following major factors.

Axial movement

The most common way to configure bearings is to install a set of axially positioned “same bearings” on one end of the shaft, and install a set of axially movable “floating bearings” on the other end, in order to prevent the thermal expansion and contraction of the shaft resulting in stuck phenomenon. The frequently used “floating bearing” is a cylindrical roller bearing with no ribs on the inner ring or outer ring. At this time, the inner ring and the shaft or the outer ring and the housing hole can be fitted with an interference fit. Sometimes non-separable deep groove ball bearings or spherical roller bearings can be used as floating bearings, but when installing the inner ring and shaft or outer ring and the housing hole, clearance fit should be selected to ensure that the inner ring or outer ring has Enough freedom of axial movement.

Friction torque

The friction resistance of ball bearings is smaller than that of roller bearings. When pure radial load is applied, the friction resistance of radial contact bearing is small; when pure axial load is applied, the friction resistance of axial contact bearing is small; when combined load is applied, the friction resistance of angular contact bearing with close contact angle and load angle is the least. In instruments and machinery that require low friction torque, ball bearings or cylindrical roller bearings are more appropriate. In addition, low friction torque bearings should avoid the use of contact seals. At the same time, it is recommended to use drip lubrication, oil-air lubrication or other lubrication methods that are conducive to reducing friction.

Installation and removal

Bearings with cylindrical bores are used in machines that are frequently installed and disassembled. Separate angular contact ball bearings, tapered roller bearings, separable cylindrical roller bearings, needle bearings and thrust bearings should be preferred. The bearing with a conical inner hole can be installed on the shaft journal, or on the cylindrical shaft journal with the aid of an adapter sleeve or a withdrawal sleeve, which is very convenient for installation and disassembly.

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Post time: May-06-2021