The operating temperature of an outer ball cylindrical roller bearing depends on a number of factors, including the amount of heat generated by all associated heat sources, the rate of heat flow between the heat sources, and the ability of the system to dissipate heat. Heat sources include bearings, seals, gears, clutches, and oil supplies, among others. Heat dissipation depends on many factors, including shaft and housing material and design, oil circulation and external environmental conditions. These factors will be introduced separately in subsequent chapters. Heat Under normal operating conditions, most of the torque and heat of the bearing model comes from elastohydrodynamic losses at the roller/ring contact. Heat generation is a product of bearing torque and speed. Calculate the calorific value using the formula below. Qgen = k4n M tapered bearings can use the following formula to calculate the torque. M = k1G1 (nμ)0.62 (Peq) 0.3 where: k1 = bearing torque constant = 2.56 x 10-6 (M is in N/m) k4 = 0.105 (Qgen is in W, M is in N/ m) For non-tapered bearings, the calculation method of torque is given in the following chapters. Heat dissipation: Determining the heat flow of a bearing for a particular application is a complex issue. In general, factors that can be considered to affect the rate of heat dissipation include: 1. The temperature gradient from the bearing to the housing. This factor is affected by the size of the bearing housing and external cooling devices (eg fans, water cooling, etc.). 2. Bearing to shaft temperature gradient. All other heat sources such as gears and other bearings and adjacent components can affect the temperature of the shaft. 3. Heat carried away by the circulating oil lubrication system. To some extent, factors 1 and 2 can vary depending on the application. Heat dissipation modes include heat conduction in the system, convection on inner and outer surfaces, and heat radiation between adjacent structures. In many applications, heat dissipation can be divided into two parts - the heat carried away by the circulating oil and the heat dissipated through the structure. It is easier to control the heat taken away by the circulating oil system to dissipate the lubricating oil. In splash lubrication systems, cooling coils can be used to control oil temperature. The heat carried away by the lubricating oil in the circulating oil lubrication system can be calculated by the following formula. Qoil = k6 Cpρf (θo - θi) where: k6 = 1.67 x 10-5 (Qoil in W) = 1.67 x 10-2 (Qoil in BTU/min) If the circulating oil is mineral oil, take away The amount of heat can be calculated using the following formula: Qoil = k5 f (θo - θi) The following coefficients apply to the heat generation and heat dissipation formulas listed on this page. Where: k5 = 28 (Qoil in W, f in L/min, θ in °C).
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