Detailed Installation Of Tapered Roller Bearings Back To Back

- Aug 07, 2019-

1. Installation place


Bearings should be installed in a clean, dry environment. Keep away from metalworking equipment or machinery that produces metal debris and dust. When it is necessary to install bearings in unprotected areas (as is often the case with oversized bearing installations), measures must be taken to protect the bearings, mounting locations and related parts from dust, dirt and moisture, such as wax paper, Plastic cloth or rag covers or wraps related parts such as bearings and journals.


2. Preparation before installation and disassembly


Prepare all necessary parts, tools, equipment, and materials before installation. Carefully study the drawings or instructions to determine the correct installation sequence for the different parts. Inspect the bearing housing, shaft, seals, and other parts of the bearing configuration to see if they are clean, especially if there are possible loose holes, conduits, or grooves. Check the dimensional and shape tolerances of all components in contact with the bearing.


3.bearing handling


In general, the use of protective gloves and special handling tools and transport is the best practice. This not only saves time and money, but also reduces work intensity, reduces risk and reduces health hazards. Therefore, when handling hot or oily bearings, it is recommended to use heat-resistant or oil-proof gloves. For large bearings or heavy bearings, use cranes to move or position, and use steel belt or canvas hoisting bearings.

The spring between the hook of the hoisting crane and the belt assists in the positioning of the bearing when the bearing is pushed onto the shaft. In order to facilitate lifting, extra large bearings can be machined with screw holes on the end faces of the ferrules to fix the eye bolts. The eyebolts can only withstand axial loads parallel to the axis.


4.single row two sets of bearings back to back installation


Single row tapered roller bearings are generally installed in pairs. The two outer ring large end faces can be oppositely mounted back to back (DB), the two outer ring small end faces are opposite to each other (DF), or one outer ring is small. The end face is connected to the other end of the outer ring (DT). During the back-to-back installation of the bearing, the outer inner component is to be installed, disassembled and reinstalled. The inner diameter of the bearing and the shaft should be properly selected, and the correct and reasonable tools are used to facilitate the installation and disassembly, and the shaft and inner shaft are guaranteed. The rings, rollers and cage are not damaged.


5.bearing trial operation


After the bearing is installed, add the specified lubricant and then perform a test run to check the sound and temperature of the bearing. The test run should be carried out under the condition that the minimum load is met. In the case of a large speed range, it should be operated at medium and low speeds. Under no circumstances should rolling bearings be started under no-load conditions and accelerated to high speeds as this may cause the rollers to slide over the raceways and damage the raceways.


Under normal circumstances, the bearing will emit a uniform sound during operation, and there will be a howling or sharp and harsh sound, indicating that the lubrication is insufficient. If there is uneven sound, there may be impurities in the bearing or damage to the bearing during installation. Rolling surfaces, etc.


The temperature of the bearing will increase after starting the equipment, which is normal. Stirring the grease during operation will increase the temperature of the bearing and will only drop until the grease is evenly distributed inside the bearing, after which equilibrium temperature is reached. Abnormal rise in temperature may be due to excessive grease or too small bearing clearance, or it may be caused by improper manufacturing or installation of related parts or excessive friction of seals.


After the equipment is running at low or medium speed, check the oil level of the seals, lubrication equipment and oil tanks. After meeting the relevant requirements, adjust to the normal speed and gradually load to normal load operation. The maintenance bearings and related parts should be inspected regularly during use to ensure reliable and long-life operation of the bearings.


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