Many application parameters determine product performance. Although only a few parameters may be important in a particular application, careful analysis of all parameters is necessary to ensure that no important parameters are missed.
Performance application parameters can be divided into the following 4 categories:
1. Physical parameters. Including the available space of the bearing or bearing system, The bearing or bearing system can bear the load, the shape, material, dimension, and tolerance control of the shaft and housing is integrated into the bearing to simplify the installation structure
2. The higher the working temperature, the greater the available space and the bearing load of the bearing system, and the higher the precision and reliability. However, the cost of adding additional bearing loads is high, so there is no need to add them unless necessary. The design of the shaft and housing has a large impact on the final bearing performance. The shaft should be a solid cylinder and the material used should be fully compatible with the thermal expansion coefficient of the bearing. The cross-section of the housing should be uniform to provide full circumferential support for the bearing. To ensure precise alignment, the shaft and housing should also feature precision machined shoulders or races.
3. Operating parameters. include:
3.1 Speed ​​determines the number of load cycles that the bearing can withstand, and thus affects the service life of the bearing. Speed ​​is usually expressed in terms of the relevant guide parameter “dN”, which also affects other aspects of bearing operation, including oil flow profile, oil film thickness, centrifugal load on rolling elements, displacement, overheating, and lubrication method.
3.2 Load can be decomposed into three directions radial, axial, and bending moment and the loads in these three directions will correspondingly generate constant load, alternating load, vibration load, or shock load. The combined effects of these loads should be carefully considered to ensure maximum bearing life and optimum performance.
3.3. Environmental parameters, the environment is a fixed factor for the final product, but whether the bearing is to be protected or exposed to a certain environment is an optional design factor. Either ambient temperature or internally generated temperature should be considered as the main consideration. The nature of the surrounding medium (liquid or gas) may place certain requirements on tightness, special anti-corrosion treatments, or relubrication. In addition, any special environment (such as a magnetic field or radiation environment) is also a necessary factor that should be considered in the design.
3.4. In Economic parameters, the total system cost should be carefully weighed, not only the bearing cost but also the total cost of bearing installation and replacement should be considered.
Many parameters are fixed in a specific application, but some are variable and can be modified or controlled if necessary. The designer makes the final choice after weighing these parameters.