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Bearing installation, disassembly and use environment

by:JNSN     2021-10-26

1. Bearing installation:

The bearing installation must be carried out in a dry and clean environment. Before installation, carefully check the processing quality of the mating surface of the shaft and the housing, the end surface of the shoulder, the groove and the connecting surface. All mating and connecting surfaces must be carefully cleaned and deburred, and the unprocessed surface of the casting must be cleaned of sand.

The bearing should be cleaned with gasoline or kerosene before installation, and used after drying to ensure good lubrication. The bearing is generally lubricated with grease or oil. When grease lubrication is used, greases with excellent performance such as no impurities, anti-oxidation, anti-rust, and extreme pressure should be selected. The amount of grease filled is 30%-60% of the volume of the bearing and the bearing box, and should not be too much. The sealed double-row tapered roller bearing and the water pump shaft bearing have been filled with grease, and the user can use it directly without cleaning.

When installing the bearing, an equal pressure must be applied to the circumference of the end face of the ring to press the ring in. It is not allowed to directly knock the end face of the bearing with a tool such as a head to avoid damage to the bearing. In the case of small interference, the end face of the bearing ring can be pressed with a sleeve at room temperature, and the sleeve can be beaten with a shovel to press the ring in evenly through the sleeve. If installed in large quantities, hydraulic presses can be used. When pressing, ensure that the end face of the outer ring and the end face of the housing shoulder, and the end face of the inner ring and the end face of the shaft shoulder are pressed tightly, and no gap is allowed.

When the interference is large, it can be installed by oil bath heating or induction heating bearing method. The heating temperature range is 80℃-100℃, and the highest can not exceed 120℃. At the same time, use nuts or other appropriate methods to tighten the bearing to prevent the bearing from shrinking in the width direction after cooling and causing a gap between the ring and the shaft shoulder.

The clearance of the single row tapered roller bearing should be adjusted at the end of the installation. The clearance value should be specifically determined according to different operating conditions and the size of the matching interference. If necessary, it should be tested to determine. The double-row tapered roller bearings and the water pump shaft bearing have been adjusted in clearance before leaving the factory, so there is no need to adjust them during installation.

After the bearing is installed, a rotation test should be carried out. First, it is used for the rotating shaft or the bearing box. If there is no abnormality, it will run with no load and low speed with power, and then gradually increase the rotation speed and load according to the operating conditions, and Detect noise, vibration and temperature rise, if abnormalities are found, stop the operation and check. It can be delivered to use only after the operation test is normal.

2. Disassembly of the bearing:

When the bearing is to be used after being removed, an appropriate disassembly tool should be used. When disassembling a ferrule with an interference fit, only the pulling force can be applied to the ferrule, and it is never allowed to transmit the disassembly force through the rolling elements, otherwise the rolling elements and raceways will be crushed.

3. Bearing use environment:

According to the use part, use conditions and environmental conditions, select the size, precision, and match the appropriate bearing is the prerequisite to ensure the life and reliability of the bearing.

1. Application location: Tapered roller bearings are suitable for bearing combined radial and axial loads based on radial loads. They are usually paired with two sets of bearings, which are mainly used on the front and rear wheels of automobiles. , Active bevel gear, differential, reducer and other transmission parts.

2. Allowable speed: In an environment with correct installation and good lubrication, it is allowed to be 0.3-0.5 times the limit speed of the bearing. Under normal circumstances, 0.2 times the limit speed is the most appropriate.

3. Allowable tilt angle: Tapered roller bearings generally do not allow the shaft to tilt relative to the housing hole. If tilted, the maximum is not more than 2'.

4. Allowable temperature: Under normal load, the lubricant has high temperature resistance, and the lubrication is sufficient, the general bearing is allowed to work at an ambient temperature of -30℃-150℃.

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