What are the key points of bearing installation and disassembly?

In order to ensure the stable operation of the bearing system and reach the expected service life, the bearings need to be installed correctly. If the installation is incorrect, the bearings will be damaged prematurely, which may affect the machine experience, increase noise and heat, or cause the machine to shut down and cause property damage. , causing health hazards to users. Today I will introduce to you some key points and techniques for bearing installation and disassembly. I hope it can help you.

1. Tips and key points for disassembling bearings

When replacing a bearing, the first step is to remove the failed bearing. The best option is to use a puller and a press. Using the puller to safely pull the bearing out of the outer ring can minimize damage to the shaft and housing. body damage and save time.

In addition to the puller, a separator can also be used to disassemble the bearing. The separator is designed with two plates placed behind the bearing. The bearing is pulled out by the force on the plate. If a heavy bearing needs to be disassembled, the separator can use hydraulic pressure. Auxiliary cylinder supplies power.

It is not recommended to use the removed bearing again, but it is necessary to carefully inspect the removed bearing to determine the cause of bearing failure and summarize experience to protect the bearing when using it in the future. Some bearing damage is invisible to the naked eye and may require advanced analysis tools to determine the cause of the failure.

The removed bearings can be resent to the manufacturer, who will clean, inspect, measure, and re-grind the bearings. If they meet the conditions for reuse after inspection, they can be reused. When dealing with some large and expensive bearings, You can save a lot of money by doing this.

2. Tips and key points for installing bearings

When you need to install a new bearing, you need to handle it with special care. The first thing is to ensure that there is a clean, dry, and vibration-free storage space. Do not open the bearing package before installing the bearing. Unless the instructions require it, you should not wipe or clean it before installation. Factory prefilled with oil or grease.

Before starting installation, you need to ensure that the bearing housing and shaft are clean and free of burrs. You can use emery to polish, but the particles produced by emery paper may also contaminate the bearing. It is recommended to consider using an industrial transparent polishing pad to clean the shaft and housing, and then use light engine oil. To remove moisture, the bearings must be kept clean throughout the process.

When installing you need to make sure you also measure the housing bore and shaft to make sure they are within the recommended tolerances of the bearing and machine. It is recommended to use tools such as vernier calipers or micrometers for measurement. The amount of force you should use when installing the bearing depends on the type and degree of fit. , in many applications, such as motor shafts, the inner ring requires an interference fit, while the outer ring requires a clearance fit.

If the bearing diameter is less than 50mm and its inner ring is installed with a slight interference fit, consider using a bearing driver. The driving tool consists of a solid hammer, polymer impact ring and metal tube. The tube driver is multi-purpose and can be used with oil seals. , oil seal and bushing are used together.

You need to make sure you are using a safe press that is securely fastened to a sturdy workbench. A stand should be used with a long handle to provide leverage. Press the handle and use an anvil to apply pressure on the handle. Support the machine slowly.

In order to easily remove the bearing, you can use the principle of thermal expansion and contraction to increase or decrease the temperature of the bearing, shell or shaft to separate the bearing from the shaft and shell, making it easier to remove the bearing. You must ensure that the shell and shaft are clean and free of burrs. , and need to be measured correctly to ensure that the dimensions of the housing or shaft are within the recommended range. If they are outside the recommended range, they need to be replaced.

Induction heaters can be used to heat bearings. Induction heaters are safer, cleaner, and more efficient than other methods. Induction heaters generate a strong magnetic field, induce eddy currents in the metal shaft, and connect secondary coils to deliver low AC current, and the bearing acts as a short circuit, the effect is that the ferrules closer to the rod heat up faster, thus requiring the bearing to be heated several times.