The error factors influence the service life of the main aspects of NTN import bearings

First, the restrictions on the size of the bearing. NTN import bearings can usually install space is restricted. In most cases, the diameter of axle ( Or bearing inside diameter) Based on mechanical design or other design constraints. So bearing type and size of the choice is determined according to the inner diameter of the bearing. As a result, the main dimensions of the standard bearing table according to the international standard and diameter is compiled. The size of the standard bearing form is various, is best when mechanical device design with a standard bearing ( This design to the bearing is easy to purchase, just as an aside, here model does have some bearing on the catalogue, but some non-standard bearings in mainland China there is no spot, futures will be a long time, sometimes to consider when bearing selection so late time cost and the cost of replacement) Bearing load, the load on the bearing, the nature, size, direction is changeable. Usually, the basic load rating on dimension table are displayed. Axial load and radial load, and so on, but also important factors is to select a suitable bearing. When the size of the ball and needle bearing fairly, needle roller bearing is usually have higher load capacity and bear the larger vibration and shock loads. Second, the speed of the bearing. Allow speed is according to the type of NTN import bearings, size, precision, cage type, load, lubrication, and cooling way. Bearing table lists the standard precision bearings allow speed under oil lubrication and grease lubrication. Usually, deep groove ball bearings, automatic self-aligning ball bearings and cylindrical roller bearings are suitable for high-speed operation. Third, the tolerance of the bearing. Bearing dimensional accuracy and rotation accuracy is according to ISO and JIS standard. For high-precision and high-speed machines, recommend the use of level 5 or above precision bearing, deep groove ball bearings, angular contact ball bearings and cylindrical roller bearing is suitable for high precision mechanical operation. Rigidity, when bearing rolling element and raceway contact pressure, will produce elastic deformation. Some mechanical need to minimize the elastic deformation. Roller bearing is smaller than ball bearings produced by elastic shape variables. The factors affecting the service life of NTN import bearings use may have many, can be used from the factors and internal factors for further instructions. Use factors mainly refers to install, use, maintenance, maintenance, repair and so on meets the technical requirements. According to the bearing installation, use, maintenance, maintenance of technical requirements, the operation of the bearing on the load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, found that abnormal immediately to find the reason, adjustment, so that it is back to normal. Installation condition is one of the primary factor of use factor, bearing is often caused by improper installation of a complete set of change the stress of bearing between various parts, NTN import bearings at the end of the abnormal state of operation and earlier in general, the service life of bearing permissible error Angle's ability is limited, without too much on the bearing under the condition of extra stress, between the inner and outer ring allows Angle error depends on: 1. The radial clearance of bearing in the runtime. 2. The size of the bearing. 3. Interior design. 4. Effect on the bearing force and moment. At present, due to the relationship between these factors is complex, so can't give a definite applied value. But any large Angle error can lead to an increase in noise and shorten NTN import bearings working life.