How To Calculate The PV Value Of CSB-EPB® Plastic Plain Bearings?
How to calculate the PV value of CSB-EPB® plastic plain bearings?
How to calculate the PV value of CSB-EPB® plastic plain bearings? First of all, we must know what the PV value is before we can calculate the PV value of the plastic plain bearings. The PV value of a bearing refers to the product value of the bearing under certain load and linear speed conditions. The PV value of the bearing is an important index for evaluating the comprehensive performance and a measurement the service life. The PV value is inversely proportional to the service life of the bearing, so it is recommended to use bearings with lower PV values when designing to ensure that the bearing will have a longer service life
Intermittent operation correction factor y1
In many cases, the operation of the bearing is not continuously. When the bearing does not reach the maximum allowable temperature during short-term operation (running time within 10 minutes), the allowable PV value of the bearing can be higher. It is because during the stop time, the heat of the bearing generated by friction is fully dissipated. Table 13 shows the correction factor y1 of the bearing PV value at different ratios of the bearing stop time and the running time.
Intermittent operation correction factor y2
Although CSB-EPB® plastic plain bearings are specifically designed for dry friction applications, they have good compatibility with most lubricating media such as general grease. Adding a lubricating medium during the start-up phase of the bearing can improve the start-up performance of the bearing and shorten the running-in period. The bearing capacity of plastic bearings will be greatly improved when there is lubricant. With the intervention of external lubricants, the calorific value of friction is greatly reduced, so that the temperature of bearing is reduced and the load capacity is increased. Table 14 shows the PV value correction factor y2 under various lubricating media.