Novice Installation Of Bearings
Novice Installation Of Bearings
2021年12月26日
Special Precautions For High Speed Bearing Installation
Special Precautions For High Speed Bearing Installation
2021年12月26日

Bearing Fit Installation Method

Installation Method

The bearing shall be cleaned with gasoline or kerosene before installation, and Installation Method used after drying, and good lubrication shall be ensured. The bearing is generally lubricated with grease or oil. When grease lubrication is used, grease with excellent properties such as no impurities, oxidation resistance, rust prevention and extreme pressure shall be selected.

The filling amount of lubricating grease shall be 30% – 60% of the volume of bearing and bearing box, and shall not be too much. Installation Method The double row tapered roller bearing with sealing structure has been filled with grease, which can be used directly by users and can not be cleaned.

During bearing installation, equal pressure must be applied on the circumference of the ferrule end face to press the ferrule in. Installation Method It is not allowed to directly knock the bearing end face with hammer and other tools to avoid damaging the bearing. When the interference is small, the sleeve can be pressed on the end face of the ferrule at room temperature, the sleeve can be knocked with a hammer, and the ferrule can be pressed in evenly through the sleeve.

In case of mass installation, hydraulic press can be used. Installation Method When pressing in, 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 without clearance.

Bearing Fit Installation Method

When the interference is large, the bearing can be installed by oil bath heating or inductor heating. The heating temperature range is 80 ℃ – 100 ℃, and the high temperature cannot exceed 129 ℃. Installation Method At the same time, tighten the bearing with nuts or other appropriate methods to prevent the gap between the ferrule and the shaft shoulder due to the shrinkage in the width direction after the bearing is cooled.

The following four points should be paid attention to when selecting the fit:

(1) The free end bearing must be able to adapt to the length change of the shaft and bearing seat hole, Installation Method that is, it must have the ability to adapt to the swimming of the axial position within a certain range.

(2) Attention must be paid to make the bearing installation and disassembly simple, Installation Method labor-saving, time-saving and cost-saving.

(3) The circumferential surface of the bearing ring shall be well supported and stressed evenly to reduce deformation and Installation Method give full play to the bearing capacity of the bearing.

(4) The ferrule cannot slide Installation Method along the tangent direction in its mating surface, otherwise the mating surface will be damaged.

Acquisition of preload

The preload can be obtained by grinding the end face of a ferrule in the bearing, or Installation Method placing two spacer rings with different thickness between the inner and outer rings of a pair of bearings to clamp the bearings together so that the steel ball is in close contact with the raceway.

The preload has a great impact on the service life of the bearing. According to relevant data, when the bearing is equipped with 0.012mm interference, the service life is reduced by 38%, and when there is 0.016mm interference, the service life is reduced by 50%; When the bearing is equipped with a clearance of 0.004mm, the service life decreases significantly.

When there is a clearance of 0.008mm, the service life decreases by 70%. Therefore, it is very important to select the preload reasonably. Generally, small preload should be selected for high speed and large preload should be selected for low speed. At the same time, the preload shall be slightly greater than or equal to the axial working load.