TIMKEN bearing operating temperature limit

Rolling bearing working temperature: because of the bearing is applied to a variety of occasions and the environment, all in most cases, the working temperature of bearing is not out of the question. But some application conditions will be high speed or working temperature. At this time must pay special attention to the working temperature not to exceed bearing limit temperature. Minimum limit temperature based mainly on the lubricating ability of the maximum temperature is usually limited by material and/or lubricant, but also restricted by bearing using the device's accuracy. The following will introduce these limitations. Bearing material restrictions: when the temperature over 120 ° C, after standard heat treatment of ordinary bearing steel can't maintain at least 58 HRC hardness. Proper heat treatment process to ensure the overall dimensions of the stability of the Timken bearings. Ordinary Timken® Tapered roller bearing and ball bearing in - 54 ° C to 120 ° C temperature can maintain the stability of the overall dimensions, spherical roller bearing, the highest at 200 ° C temperature stable appearance size, cylindrical roller bearing, the highest at 150 ° C temperature stable dimension. These bearings can be according to the requirements for the following higher stability. These indexes accord with standard of DIN 623. The highest working temperature stability ° C ° FS0 150 302 250 482 200 392 s1 s2 s3 300 572 350 662 s4 dimension stability of the product in the workplace is still possible for microstructure deformation and size changes, the deformation is mainly martensite tempered and retained austenite decomposition. Change depends on the working temperature and duration, and the forming and heat treatment of steel. Temperature exceeds the limits in table 19, you need to use special high temperature steel. Consult your timken engineer, understand the thermal stability of non-standard steel or optional bearing type high temperature steel grade products. Lists recommended under various working temperature of ball bearing, bearing ring and roller materials, also lists the recommended by the chemical composition, hardness and dimensional stability. Working temperature affect the thickness of lube film and running clearance, these two factors will directly affect the service life of bearing. High temperature can make the lubricating oil film thinning, leading to poor lubrication contact parts. Working temperature can also affect the cage, sealing ring, and the performance of the dust cover, in turn, affects the performance of the bearing. In table 21 shows the material of these parts and its working temperature range.