Characteristics Of Flexible Bearing
Characteristics Of Flexible Bearing
2021-12-08
什么是磁轴承?
什么是磁轴承?
2021-12-08

How To Select Bearing Type

All kinds of bearings have different characteristics and are suitable for different applications of various machines. When selecting the bearing type, the following factors should generally be considered. 一般来说, 轴承推力载荷选用推力轴承和角接触轴承, 滚珠轴承通常用于高速应用, 选择滚柱轴承承受较大的径向载荷.

Steps/methods

1. Space and position of the machine occupied by the bearing

在机械设计中, 一般先确定轴的尺寸, 然后根据轴的尺寸选择滚动轴承. 通常, 滚珠轴承用于小轴,滚子轴承用于大轴. 然而, 当轴承在机器的直径方向受到限制时, 滚针轴承, 选用超轻和超轻系列球或滚子轴承; When the axial position of the bearing in the machine is limited, narrow or ultra narrow series ball or roller bearings can be selected.

2. Magnitude, direction and nature of load on bearing

Load is the main factor in the selection of bearings. 滚子轴承用于承受重载荷, 滚珠轴承用于承受轻载或中载, 渗碳钢或贝氏体淬火制成的轴承可以承受冲击和振动载荷. 在载荷方向方面, when bearing pure radial load, 深沟球轴承, cylindrical roller bearing or needle roller bearing can be selected. When bearing the small pure axial load of NSK bearing, 可选择推力球轴承;

承受较大的纯轴向载荷时, 可选择推力滚子轴承. 当轴承承受径向和轴向联合载荷时, angular contact ball bearing or tapered roller bearing is generally selected. For cantilever support structures, tapered roller bearings or angular contact ball bearings are often used in pairs.

How To Select Bearing Type
3. Centering performance of bearing

当轴中心线与轴承座中心线不同时, 有角度误差, 或者由于轴的两个支撑之间的距离大,轴的刚度很小, 受力容易弯曲或倾斜, 可选择调心性能好的调心球或调心滚子轴承和外球轴承. 此类轴承在轴轻微倾斜或弯曲时仍能保持正常运转.

4. Rigidity of bearing

The rigidity of bearing refers to the force required for bearing to produce unit deformation. The elastic deformation of rolling bearing is very small, which can not be considered in most machines, but in some machines, the bearing rigidity is an important factor. 一般来说, cylindrical and tapered roller bearings should be selected. Because when these two kinds of bearings bear load, their rolling elements and raceways belong to point contact and have poor rigidity. 此外, various bearings can also be preloaded to increase the support rigidity. 例如, angular contact ball bearings and tapered roller bearings, in order to prevent shaft vibration and increase support rigidity, a certain axial force is often applied in advance during installation to make them compact with each other.

5. Speed of bearing

Each bearing model has its own limit speed, which is determined by physical characteristics such as size, type and structure. The limit speed refers to the high working speed of the bearing (usually R / 分钟). Exceeding this limit will lead to the increase of bearing temperature, the drying of lubricant and even the seizure of the bearing. The speed range required for the application helps to determine what type of bearing to use. D is the bearing size, which usually refers to the pitch diameter of the bearing. When selecting the bearing, use the average value of the bearing inner diameter and outer diameter, in mm. A limiting speed factor (DN) is obtained by multiplying the pitch diameter d by the shaft rotation speed in R / 分钟. DN is very important in the selection of bearing type and size. The product catalogue of most bearing manufacturers provides the limit speed value of their products. Practice has proved that it is better to work under 90% of the limit speed.

6. Bearing travel and axial displacement

通常, a shaft is supported by two bearings at a certain distance. In order to adapt to different degrees of thermal expansion of shaft and shell, one bearing shall be fixed axially and the other bearing shall be movable on the shaft (IE. movable support) during installation, so as to prevent jamming caused by shaft elongation or contraction. Cylindrical roller bearings (original 2000 和 32000) and needle roller bearings without retaining edge on the inner or outer ring are usually selected for traveling support, which is mainly because the internal structure of such bearings allows proper axial displacement between the shaft and the housing.

此时, the inner ring and the shaft, the outer ring and the housing hole can be tightly matched. When the non separable bearing is used as the traveling support, such as deep groove ball bearing and self-aligning roller bearing, the outer ring and housing hole must be allowed in the installation of INA Bearing, or the inner ring and shaft must be loosely matched to make it move freely in the axial direction. Tapered roller bearings, self-aligning roller bearings and deep groove ball bearings basically belong to positioning type. When used as non positioning, they are installed with loose fit. All thrust roller bearings are positioning bearings.

7. It is convenient for bearing installation and disassembly

When selecting bearing types, consideration must be given to whether the installation and disassembly of bearings are convenient, especially for the installation and disassembly of large and extra large bearings. The general angular contact ball bearing, tapered roller bearing, cylindrical roller bearing and needle roller bearing with separable outer ring can be installed and disassembled conveniently. Their inner ring and outer ring can be installed on the shaft or in the shell hole respectively. 此外, self-aligning roller bearings with tapered holes in the inner diameter, self-aligning roller bearings with tight sleeves, double row cylindrical roller bearings and self-aligning ball bearings are also easier to install and disassemble.

8. Other requirements

In addition to the above factors, the working environment temperature of the bearing, bearing seal and special requirements for friction torque, 振动, 噪音, ETC. shall also be considered.

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