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Two installation methods of cylindrical roller bearings

by:JNSN     2022-09-25
Cylindrical rollers and raceways are line contact bearings with large load capacity and mainly bear radial loads. The friction between the rolling element and the rib of the ring is small, which is suitable for high-speed rotation. According to whether the ring has ribs or not, it can be divided into single row cylindrical roller bearings such as nu, nj, nup, n, and nf, and double row cylindrical roller bearings such as nnu and nn. The bearing is a structure in which the inner ring and the outer ring can be separated. Common models are: skf nj2216ecm/c3, ina sl1818/500-e, ina lsl192334-tb and so on. Cylindrical roller bearings without ribs on the inner or outer ring can be used as free end bearings because the inner and outer rings can move relative to the axial direction. Cylindrical roller bearings with double ribs on one side of the inner ring and outer ring and a single rib on the other side of the ring can withstand a certain degree of axial load in one direction. Generally, a steel stamping cage is used, or a copper alloy turning solid cage is used. However, there are also part of the use of polyamide forming cage. When many people install the cylindrical roller bearing, the bearing is damaged due to the wrong installation method and cannot work normally. It is emphasized here that the correct installation method of the cylindrical roller bearing is a very important part. There are two common ways of correct installation of cylindrical roller bearings: one is cold installation and the other is hot installation. 1. Cold installation When installing a small bearing that is not too tight, you can use a sleeve and hammer the sleeve to lightly tap the sleeve to install the bearing in a suitable position. When knocking, it should act on the cylindrical roller bearing ring as evenly as possible to prevent the bearing from tilting or skewing. Most cylindrical roller bearings are mounted using the press-fit method. If the inner and outer rings of the cylindrical roller bearing are to be installed on the shaft and the housing at the same time, it must be ensured that the same pressure acts on the inner and outer rings at the same time, and the contact surface of the installation tool must be on the same plane. 2. Hot Mounting Normally, for larger bearings, it is not possible to mount the bearing without heating the bearing or housing, because as the size increases, more force is required during mounting. The temperature difference between the cylindrical roller bearing ring and the shaft or housing required for hot mounting depends primarily on the interference and the diameter of the bearing fit. The heating temperature of the open bearing shall not exceed 120℃. It is not recommended to heat cylindrical roller bearings with seals and dust caps above 80°C (make sure that the temperature does not exceed the temperature allowed by the seals and grease). When heating the cylindrical roller bearing, it should be heated evenly, and there must be no local overheating.
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