Are there any requirements for the environment when selecting bearings?

The range of environments is wide and requires us to consider many aspects before selecting a bearing.

Considerations for bearing selection.

First, select the size of the bearing:

1. Required lifespan;

2. Rated basic dynamic and static load;

3. Safety factor;

4. Allowable speed;

5. Allowable axial load;

6. Allowable space.

Second, select the internal clearance:

1. The material and shape of the shaft and bearing housing;

2. Cooperation; 3. The temperature difference between the inner and outer rings;

4. Eccentricity is allowed in the inner and outer rings;

5. a load; 6. a preload;

7. Rotational speed. 3. Select the type and type of bearing

1. Size limit;

2. Bearing load (size, direction, vibration, impact load);

3. Rotation speed;

4. Bearing accuracy;

5. Rigidity;

6. The inner and outer rings are allowed to be eccentric;

7. Friction torque;

8. Hairdressing and disassembly requirements;

9. ** and the situation in the warehouse.

Fourth, the selection of bearing accuracy:

1. Shaft tolerance;

2. a speed; 3. Torque fluctuation.

Determine the mode of operation:

1. Installation tolerance;

2. Installation and disassembly process.

Land, the choice of special bearing form:

1. Operating environment (high and low temperature, vacuum, chemical environment, etc.);

2. The need for high dependency.

Seven, master the use of mechanical devices and imported bearings, etc.

1. The function and structure of the machine;

2. The use of bearings;

3. The load of the bearing (size, direction);

4. a rotation speed; 5. Vibration and shock load;

6. Temperature (ambient temperature, temperature rise, bearing temperature);

7. Surrounding environment (corrosive, clean, lubricated).

Weigh and select the form and material of the cage

1. Rotation speed;

2. Noise frequency;

3. Vibration and shock load;

4. Instantaneous load;

5. Lubrication type and method.

Jiu, the selection of lubricant, lubrication method, sealing method:

1. Operating temperature;

2. Speed requirements;

3. Lubrication types and methods;

4. a sealing method;

5. Maintenance and testing.

**Select bearing precautions (5 points.

Hello, for example, your bearing is used in a place where the impact load is relatively large, and the bearing with impact resistance should be used, and if it is used in a place with a poor environment, it is necessary to use a bearing with a dust cap and a bearing with cleaning oil holes. The choice is different depending on the environment.

The same type of bearing has grades, as well as corrosion resistance, high temperature resistance, one side with a dust cover, two sides with a dust cover, or a dust ring according to their own needs to determine.

1. Select the size according to the requirements of the space.

2. According to the load direction, size, nature, speed, whether it needs to be aligned, and the internal stiffness requirements of the bearing type capacity.

3. Calculate the load of the bearing.

4. Calculate the approximate life of the bearing, and in different working occasions, the selected bearing should be able to reach a specified life range.

5. Determine the bearing type.

6. Check the load and check the speed.

7. Determine the clearance, accuracy, and select preload.

In addition, we should pay attention to what is the procurement cycle of this bearing, I often hear that some customers want to buy some bearings, the procurement cycle takes more than half a year, because this was not considered when the original choice, some uncommon models were used, or non-standard bearings, or even customized bearings, the design standards are reached, but when the bearings are replaced in the later stage, the order cycle is very long.

Transverse and longitudinal loads Working environment Rotational speed There is also an optional bearing clearance.

Load, rotational speed, working environment.

The choice of rolling bearing type is related to a number of factors, usually based on the following main factors:

1.permissible space;

2.magnitude and direction of load;

3.Bearing working speed;

4.bearing rotation accuracy;

5.rigidity of bearings;

6.axial swimming;

7.frictional moment;

8.installation and disassembly;

There are many types of rolling bearings, and the following factors can be considered when selecting them.

1.The magnitude, direction and nature of the load are suitable for ball bearings to withstand light loads, and roller bearings are suitable for heavy loads and shock loads. When the rolling bearing is subjected to pure axial load, the thrust bearing is generally selected; When the rolling bearing is subjected to pure radial load, deep groove ball bearing or short cylindrical roller bearing is generally selected; When the rolling bearing is subject to pure radial load at the same time, there is not much axial load, you can choose deep groove ball bearing, angular contact ball bearing, tapered roller bearing and self-aligning ball or self-aligning roller bearing; When the axial load is large, angular contact ball bearings and tapered roller bearings with large contact angles can be used, or a combination of radial and thrust bearings can be used, which is particularly suitable for extremely high axial loads or when large axial rigidity is required.

2.The allowable speed varies greatly depending on the type of bearing. In general, bearings with low friction and low heat generation are suitable for high speeds. Rolling bearings should be designed to operate below their limit speeds.

3.When the rigid bearing is loaded, the elastic deformation will occur at the contact between the bearing ring and the rolling element, and the amount of deformation is proportional to the load, and its ratio determines the rigidity of the bearing. Generally, the rigidity of the bearing can be improved by the preload of the bearing; In addition, in the design of bearing support, the combination and arrangement of bearings can also be considered to improve the bearing stiffness.

4.Self-alignment performance and installation errorAfter the bearing is installed in the working position, the installation and positioning are often poor due to manufacturing errors. At this time, the bearing is often subjected to excessive load due to the occurrence of fishing degree and thermal expansion of the shaft, causing early damage.

Self-aligning bearings are suitable bearings for this type of application because they overcome defects caused by mounting errors on their own.

5.Mounting and disassembling tapered roller bearings, needle roller bearings, etc., belong to the type of bearing with separable inner and outer rings (the so-called separating bearings), which is easy to install and disassemble.

6.MarketabilityEven if the horizontal lathe bearing is listed in the product catalog, it may not be sold in the market; On the contrary, some bearings that are not listed in the product catalog are produced in large quantities. Therefore, it should be clear whether the bearings used are readily available.

1. The actual effect is on the bearing capacity, which is the most important factor, which will determine the service life of the bearing;

2. The actual speed of operation should be less than the limit speed of the bearing;

3. Is there room for the oil injection system in the design, and whether it is convenient for oil injection when used at ordinary times, so as to choose maintenance-free bearings or bearings that need to be oiled;

4. Choose the right grease, choose the right grease according to the force, speed and temperature.

The main factors that should be considered in the selection of rolling bearing type are:

Ball bearings are selected for light and medium load loads; Roller bearings are selected for heavy loads.

Bearing load mode Pure radial load can be used for all kinds of radial bearings. Thrust ball bearings, thrust cylindrical roller bearings and thrust needle roller bearings are selected for pure axial load; Combined loads (with both radial and axial loads) are generally used for angular contact ball bearings or tapered roller bearings. If the radial load is large and the axial load is small, deep groove ball bearings can be used.

If the axial load is large and the radial load is small, the thrust angular contact ball bearing can be selected.

Rotation speed When the rotation speed is high and only the radial load is applied, the deep groove ball bearing is selected; When bearing the combined load, it is advisable to choose angular contact ball bearings; The permissible speed of all kinds of thrust bearings is lower than that of radial bearings.

Neutralization There is a neutralization error, such as the shaft or housing deformation is large, and the machining or installation of the bearing seat is poor, and the self-aligning ball bearing or self-aligning roller bearing is selected.

Rigidity: When the bearing stiffness is required, roller bearings are selected. Various types of bearings can be stiffened to varying degrees by being properly "preloaded".

Installation and disassembly When installation and disassembly are frequent, the bearing of the separation structure is selected. Such as tapered roller bearings, cylindrical roller bearings, needle roller bearings and thrust bearings.

Bearings with a conical bore can be mounted on the tapered journal or on the cylindrical journal with the help of adapter sleeves and withdrawal sets, making it easy to install and disassemble.

Economy In the case of meeting the requirements of use, the lowest rolling bearing should be preferred. Generally speaking, ball bearings are lower than roller bearings; Secondly, the higher the accuracy, the higher the level.

The following factors should be considered in the fit selection of rolling bearings: (Bearing fit selection of cylindrical bore) 1The direction and nature of the load.

2.The magnitude of the load.

3.The effect of operating temperature.

4.bearing rotation accuracy;

5.The structure and material of the shaft and housing.

6.Easy to install and disassemble.

7.Axial displacement of a traveling bearing.