Bearing mounting issues, how to install flat bearings

Mina Electromechanical!Mina Electromechanical is a leading and sales company of world-renowned brand bearings. Specializing in the import bearings of world-renowned brands.

Shanghai Mina Electromechanical is located in Shanghai, the company maintains a good bearing import business, with the advantages of independent import sales, has become a large-scale and influential import bearing sales center in Shanghai, and has become a long-term businessman of dozens of large state-owned enterprises. Since its establishment, the company has relied on superior geographical advantages, based on the three norths, radiating the whole country, forming a stable sales network, providing high-quality bearings for many enterprises

First, the flaps on both sides of the bearing crushed, if the screw can be rotated, it is crushed, check that it is there to lock up the second, the bearing is damaged during installation, or forcibly smashed into, the bearing is deformed, the bearing is stuck in general, these two situations are generally eliminated, please rule them out one by one!

Flat bearings are relatively simple to install.

1. Prepare a simple plane bearing part, including loose ring, tight ring, and protective frame ball, as shown below.

2. Relaxation ring (this part is close to the stationary part in practical application), as shown in the following figure.

3. Put the balls framed by the protective frame, as shown in the figure below.

4. Tighten the ring, as shown below.

5. A simple plane bearing is installed, as shown in the figure below.

1. Distinguish the tight ring and loose ring of the bearing (judging according to the size of the inner diameter of the bearing, the hole diameter is different;

2. Distinguish the stationary parts of the mechanism (i.e., the parts that do not move, mainly referring to the assembly);

3. No matter what the situation, the loose ring of the bearing should always lean on the end face of the stationary part.

Common problem: The tight and loose rings of flat bearings are installed in reverse positions, which will make the bearing useless and the journal will wear out quickly.

Solution: Re-switch the loose ring and tight ring to the next position.

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The answer you're looking for: The steps for flat bearing installation are 1Clean the mounting surface:

Before installation, the installation surface needs to be cleaned to ensure that the surface is smooth and clean, free of dust and impurities. 2.Apply grease:

Apply a layer of grease to the mounting surface to reduce friction and wear and improve bearing life. 3.Mounting Bearings:

The banquet chain gently places the bearing on the mounting surface and ensures its correct orientation and position. 4.Fixed bearings:

Use bolts or other fixings to secure the bearings to the mounting surface. During the installation process, it is necessary to pay attention not to be too tight, so as not to affect the normal operation of the bearing. 5.

Check the bearing: After the installation is completed, you need to check the operation of the bearing to ensure that there is no abnormal vibration and noise during operation. 6.

Lubricate the bearing: After the installation is completed, the bearing needs to be lubricated regularly to ensure its normal operation and prolong the service life.

After the bearing is installed, when the outer ring or shaft of the bearing is rotated by hand, it feels tight, inflexible or has obvious braking phenomenon, which belongs to the fault of the bearing that cannot be slid and rotated. The reasons for this kind of failure are as follows: 1. There are no good cleaning measures for the bearing during installation, and there may be foreign objects (such as sand grains, metal chips, etc.) in the raceway, rolling element and cage pocket hole of the bearing, which are stuck in the rolling element and cannot rotate; 2. The cage is deformed during installation or transportation, which produces large friction with the bearing ring or rolling element, which affects the rotation of the bearing; 3. The original clearance of the bearing is small or the bearing is too tightly matched with the shaft or bearing seat, and the interference amount is large, which reduces the radial clearance of the bearing, so that the bearing is stuck and cannot rotate normally after installation.

(1) Clean the bearing and bearing-related parts.

2) Check the size and finishing of the related parts.

3) Installation. 4) Check the bearing after installation.

5) Supply lubricant.

It is desirable that the bearing package will be unpacked before it is about to be installed. General grease lubrication, no cleaning, direct filling grease. The lubricating oil is lubricated, and it does not need to be cleaned.

However, bearings for instruments or high-speed bearings should be washed with clean oil to remove rust inhibitors applied to the bearings. Bearings with rust inhibitors removed are prone to rust, so they should not be left alone. In addition, bearings that have been sealed with grease can be used without cleaning.

The mounting method of the bearing varies according to the bearing structure, fit and conditions, and in general, because the shaft is mostly rotated, the inner ring needs an interference fit. Cylindrical bore bearings, mostly pressed into by press, or mostly used by hot filling method. In the case of taper holes, it can be installed directly on the taper shaft or with a sleeve.

When installed in the housing, there is generally a lot of clearance fit, and the outer ring has an interference amount, which is usually pressed in with a press, or there is also a cold shrink fit method for installation after cooling. When dry ice is used as a coolant, the moisture in the air will condense on the surface of the bearing. Therefore, proper anti-rust measures are required.

The quality of bearing installation will affect the accuracy, life and performance of the bearing. Jinfeng Bearing Shandong General Manager now shares the correct installation method of the bearing

The installation of the bearing should be determined according to the bearing structure, size and the mating nature of the bearing components, the pressure should be directly added to the end face of the ring of the tight fit, and the pressure shall not be transmitted through the rolling elements, and the bearing installation generally adopts the following methods:

1. Press-in fit.

When the inner ring of the bearing is tightly matched with the shaft, and the outer ring and the bearing housing hole are loosely fitted, the bearing can be press-mounted on the shaft with a press, and then the shaft is loaded into the bearing seat hole together with the bearing, and when press-fitting on the end face of the inner ring of the bearing, the matching pipe (copper or mild steel) made of soft metal material is cushioned, and the inner diameter of the matching pipe should be slightly larger than the diameter of the journal, and the outer diameter diameter should be slightly smaller than the flange of the inner ring of the bearing, so as not to be pressed on the cage. The outer ring of the bearing fits tightly with the housing bore, and when the inner ring fits loosely with the shaft, the bearing can be pressed into the housing bore first, and the outer diameter of the matching pipe should be slightly smaller than the diameter of the housing bore. If the bearing ring is tightly fitted with the shaft and the housing hole, the inner ring and the outer ring should be pressed into the shaft and the housing hole at the same time, and the structure of the matching pipe should be able to tighten the end face of the inner ring and the outer ring of the bearing at the same time.

2. Heating fit.

This is a mounting method that uses thermal expansion to convert a tight fit into a loose fit by heating the bearing or housing. It is a common and labor-saving installation method. This method is suitable for the installation of the bearing with a large amount of interference, the bearing or the ring of the separable bearing is put into the oil tank to heat 80-100 evenly before hot installation, and then take out the oil and install it on the shaft as soon as possible, in order to prevent the end face of the inner ring and the shoulder of the shaft from fitting tightly after cooling, the bearing can be axial fastening after cooling.

When the outer ring of the bearing is tightly mated to the light metal housing, the hot assembly method of heating the housing is used to avoid abrasion on the mating surface. When heating the bearing with the oil tank, there should be a grid at a certain distance from the bottom of the box, or the bearing should be hung with a hook, and the bearing can not be put on the bottom of the box to prevent impurities from entering the bearing or uneven heating, and there must be a thermometer in the oil tank, and the oil temperature should not exceed 100 to prevent the tempering effect from occurring, so that the hardness of the ring is reduced.

1. Use special tools for bearing installation and disassembly.

Advanced installation tools can avoid bearing damage caused by improper installation of tools and operations, for example, when installing the bearing, the staff adopts the copper rod percussion method, the bearing axial force is uneven, the cage is deformed, the rolling element is damaged, the clearance becomes larger, the copper rod is struck, the copper dust flies into the bearing cage, and the bearing failure is easy to occur.

2. Check the bearing before installation.

The old bearing needs to check whether there are burrs, scars, cracks on the surface of the ball (column), the radial clearance of the old bearing, and whether the axial clearance is qualified, and generally only the radial clearance is measured. For new bearings, first of all, check whether the new bearing type is correct, and refer to Table 1 for the radial clearance standard of rolling bearings. For example, the model 6318 deep groove ball bearing, with an inner bearing diameter of 90mm, has a radial clearance range of and a maximum bearing wear of .

3. Check the matching size of the bearing and the rotor shaft.

When assembling the motor, the mating dimensions of the bearing and the rotor shaft (Table 2).

4. Control the quantity of oil in the bearing and bearing chamber.

Excessive oil volume in the bearing and box, the bearing rolling element slides, the rolling element changes from rolling friction to sliding friction, the bearing rolling element is damaged, the bearing oil volume is excessive, the free space in the bearing box is small, the bearing operating temperature rises, and the general motor end cover side is equipped with a bearing oil chamber (except for the motor designed as a double sealed bearing) According to the speed of the motor, the oil injection amount of the bearing chamber can be implemented with reference to the following standards, when the motor speed < 1500rmin, add oil, and the amount is 2 3 of the bearing chamber volume. The rotational speed between 1500 and 3000r min is 1 2 of the bearing volume. Rotational speed & common; At 3000r min, the bearing volume is less than 1 3.

In the actual working process, for the bearings running at high temperature and high speed, try not to use the bearing with the sealing surface, increase the oil volume of the motor oil cap, and install the grease nozzle, which can improve the operating life of the motor bearing.

5. Ensure that the insulation is intact.

The outer ring has an insulation design of the bearing, when the insulation is damaged when the insulation is intact, the thin bearing oil film is destroyed by the shaft voltage, and the lubrication condition of the rolling element is destroyed after the oil film is destroyed. Not only is it poor, but the resulting electric spark causes galvanic corrosion on the rolling elements of the bearing, which not only accelerates the wear of the bearing.

Method of axial fixation of parts on the shaft:

1.Shoulder; Simple and reliable, preferred choice.

2.Sleeve: used for axial fixation of adjacent parts on the shaft, simple structure, more applications.

3.Round nut: When the two adjacent parts on the shaft are far away and cannot be fixed with a sleeve, a round nut is selected, and a fine thread is generally used to avoid weakening the strength of the shaft too much.

4.Shaft end retaining ring: An on-shaft part that is used to secure the shaft end.

5.Retaining rings: Used when the axial force is small, or only to prevent the part from moving in the axial direction occasionally.

6.Set screw: Used when the axial force is small.

Circumferential fixation method of parts on the shaft:

1.Key connection (mainly flat key and dry connection): simple structure, reliable work, easy assembly and disassembly, widely used in machinery.

2.Spline connection: high bearing capacity, small stress concentration, less weakening of the strength of the shaft and the hub, good alignment and guidance of the parts on the shaft and the shaft. Disadvantages: special equipment is required for processing, and the cost is high.

3.Pin connections without pins, e.g., can transmit small radial and axial loads at the same time, and can also be used as an overload shear element in safety devices.

4.Expansion connection.

5.Interference fit connection.