First, the limitation of bearing size.
Usually, the space in which NTN imported bearings can be installed is limited. In most cases, the shaft diameter (or bearing inner diameter) is based on mechanical design or other design constraints. Therefore, the choice of bearing type and size is determined according to the inner diameter of the bearing. Therefore, the main dimension tables of standard bearings are compiled according to the international standard inner diameter dimensions.
There are many sizes of standard bearings. It is best to use standard bearings in the design of mechanical devices. (This is a digression to whether the bearings are easy to purchase. Some bearing catalogues do have models, but some non-standard bearings are There is no spot in mainland China, and sometimes the futures will be very long, so the time cost and the cost of later replacement should be considered when selecting the bearing) The load on the bearing, the load imposed on the bearing, its nature, size, and direction are changeable of. Normally, the rated basic load is displayed on the dimension table. But axial load and radial load, etc. are also important factors in choosing a suitable bearing. When the size of the ball and needle roller bearings are the same, the needle roller bearings usually have a higher load capacity and can withstand greater vibration and shock loads.
Second, the bearing speed.
The allowable speed is determined according to factors such as NTN imported bearing type, size, accuracy, cage type, load, lubrication method, and cooling method. The bearing table lists the allowable speed of standard precision bearings under oil lubrication and grease lubrication. Generally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation.
Third, bearing tolerances.
Bearing dimensional accuracy and rotation accuracy are based on ISO and JIS standards. For machinery that requires high precision and high-speed operation, it is recommended to use bearings with accuracy of 5 or above. Deep groove ball bearings, radial thrust ball bearings or cylindrical roller bearings are suitable for machinery with high operating accuracy. Rigidity, when the contact surface of the rolling element and raceway of the bearing is compressed, it will produce elastic deformation. Some machines need to minimize elastic deformation. Roller bearings produce smaller elastic deformations than ball bearings.
There may be many factors that affect the service life of NTN imported bearings, which can be further explained from the use factors and internal factors.
Using factors mainly refer to whether the installation, adjustment, use and maintenance, maintenance and repair meet the technical requirements. According to the technical requirements of bearing installation, use, maintenance, and maintenance, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of the bearing in operation. If abnormalities are found, immediately find the cause, make adjustments, and make Back to normal. Installation conditions are one of the most important factors in use. Bearings often change due to improper installation, resulting in changes in the stress state between the various parts of the entire set of bearings. NTN imported bearings run under abnormal conditions and end their service life early.
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Generally speaking, the ability of the bearing to allow the error angle is limited. Without excessive stress on the bearing, the allowable angle error between the inner and outer rings depends on:
1. The radial clearance of the bearing during operation.
2. The size of the bearing.
3. Internal design.
4. The force and moment acting on the bearing.
At present, due to the complicated relationship between these factors, it is impossible to give a clear applicable value. However, any large angle error will increase the noise and shorten the working life of NTN imported bearings.