Methods and steps of bearing selection Method and the step method and steps of bearing selected 1 choice The correct choice for shaft bearing, the host can obtain good performance, prolong the service life; the enterprises can shorten the repair time, reduce repair costs, improve the operation of machine rate, plays a very important role. Therefore, whether it is design and manufacture units, or repair using unit, in the choice of our bearing must attach great importance to the selection, all the procedures is shown in Figure 1, 1. In general, selection of bearing steps may include: 1 according to the working conditions of bearing (including the loading direction and load type, speed, lubrication, coaxial, location or non positioning, installation and repair the environment, environmental temperature etc.), basic type, grade of tolerance and clearance of bearing; 2 according to the requirements of the bearing working conditions and state of stress and life, determined by calculating the bearing type, or according to the use requirements, selected bearing model, then check the life; Rated load and the speed limit is 3 checking the bearing. Choose the main factors considered Santaibearing is the speed limit for life, dacron and load capacity, other factors help to determine the bearing type, structure, size and grade of tolerance and clearance for the final solution. 1 types of selection With different characteristics of various types of rolling bearing, different using conditions applicable to all kinds of machinery. Select the type of Santai bearing, Usually should consider the following factors. General: the thrust load selection of thrust bearing, angular contact bearings, usually use ball bearings for high speed applications, bear radial load heavy, choose roller bearing. In a word, bearing product selection of personnel from different manufacturers, numerous, choosing appropriate type. ? bearing occupied machinery space and place In the mechanical design, the general first determine the shaft size, then, according to the axial size selection of rolling bearing. Usually a small shaft using ball bearings, shaft selection of roller bearing. However, when the bearing is restricted in the direction of the diameter of the machine, is made of needle roller bearings, extra light and ultra light series of ball or roller bearings; when the bearing is restricted in the axial position of the machine, can choose the ball or roller bearing narrow or extra narrow series. The size, direction and nature? Bearing load Load is the main factor of the selected bearing. Roller bearings in the bearing heavy load, ball bearings to withstand mild or moderate load, bearing steel manufacturing or bainite quenching, can withstand the shock and vibration loads. In the direction of load, pure radial load bearing, deep groove ball bearings can be selected, Santai SUNTHAI[/url] cylindrical roller bearings or needle roller bearings. Pure axial load bearing small, can choose the thrust ball bearings; subject to pure axial load greatly, can choose the thrust roller bearing. When the bearings bear radial and axial load, general selection of angular contact ball bearing or tapered roller bearing. Self-aligning bearing performance? When the shaft and the bearing seat center line center line is different, the angle error, or because of the rigid two support spacing is larger and axis in small, easy bending or tilt, can be selected with good aligning performance self-aligning ball or roller bearings, and ball bearing. This kind of bearing in shaft slightly inclined or curved case, can keep the normal work. Bearing self-aligning performance, different axis associated with the different axes is allowed, the bigger value, aligning performance is better. All kinds of bearing allows different axis is shown in Table 1, 1 The rigidity of the bearing? The rigidity of the bearing, bearing size refers to the unit deformation force required for the. Rolling bearing elastic deformation is small, in most machines do not have to consider, but in some machines, such as the spindle, bearing rigidity is an important factor, should generally be used for cylindrical and conical roller bearing. Because these two types of bearings in the bearing load, the rolling belongs to the point contact, poor rigidity. In addition, all kinds of bearing can preload, increase the supporting rigidity of purpose. If the angular contact ball bearings and tapered roller bearings, in order to prevent the vibration of the shaft, increase the support rigidity, often in the installation of pre applied certain axial force, the pressing. Here is particularly pointed out that: the pre tension is not too large. Is too large, will make the bearing friction increases, temperature rise, affecting our bearing service life. Bearing speed? Each bearing models have the limit speed of its own, it is decided by such as size, type and structure, physical characteristics, the speed limit is bearing the highest working speed