Lubrication Limitations: For rolling bearings at relatively low temperatures, the starting torque in grease-lubricated applications usually increases significantly. The starting torque does not mainly depend on the stability of the grease, but is generally determined by the rheological properties of the grease. The high-temperature limit of grease is usually determined by the thermal stability, oxidative stability of the base oil, and the effectiveness of antioxidants.

Equipment Requirements: Equipment designers must evaluate the impact of temperature on equipment performance. For example, spindle bearings of precision machine tools may be very sensitive to thermal expansion. For some spindles, special attention is required when the operating temperature is 20°C to 35°C higher than the ambient temperature. Most industrial equipment can operate at relatively high temperatures; for instance, transmission gears can withstand a high temperature of 93°C.

Equipment such as gas turbines can operate continuously at temperatures above 100°C. However, when operating at high temperatures for a long time, the fit tolerance may be affected if the processing and heat treatment of the shaft and bearing housing are improper. Although bearings can work normally at temperatures up to 120°C, an upper temperature limit of 80°C to 95°C is more practical.

Higher operating temperatures will increase the instantaneous temperature peak and raise the possibility of TIMKEN bearing damage. Conducting sample tests based on specific applications helps determine the operating temperature range. Equipment designers should weigh all relevant factors and finally determine the operating temperature that meets the requirements.