Heating and cooling of cylindrical roller bearing

Operating temperature of cylindrical roller bearing depends on many factors, including all related between the heat source of heat, heat source of heat flow rate and the cooling capacity of the system. Heat source including bearings, sealing ring, the gear, clutch and oil supply and so on. Cooling depends on many factors, including the shaft and bearing material, and the cycle of design, lubricating oil and the external environment condition. These factors are described in later chapters, respectively. Fever under normal working conditions, bearing type torque and most of the heat from the roller/bearing ring of elastic fluid dynamic contact parts. Fever is a product of bearing torque and speed. Use the following formula calculating calorific value. Qgen = k4n M cone bearing can use the following formula to calculate the torque. M = k1G1 ( nμ) 0. 62 ( Peq) 0. 3: k1 = = 2 bearing torque constant. 56 x 10 - 6 ( M is the unit of Newton - M. ) k4 = 0. 105 ( Qgen unit is W, M is the unit of Newton - M. ) The tapered bearings, torque calculation method is given in later chapters. How to determine the bearing in the application of heat: special heat flow is a complicated problem. In general, can be thought of as the influencing factors of cooling rate include: 1. Bearing to the bearing temperature gradient. This factor affected by bearing size and external cooling devices ( Such as fan, water cooling devices, etc. ) The influence of. 2. Bearing the axial temperature gradient. All the other source of heat, such as gears and bearings and other adjacent components affect the temperature of the shaft. 3. Take away the heat circulating oil lubrication system. To some extent, factors 1 and 2 can according to different applications. Heat dissipation model including the system of the heat transfer between adjacent structure, internal and external surface of convection and thermal radiation. Many applications, the heat dissipation can be divided into two parts - circulating oil away heat and through the heat coming from the structure. Cooling lubricants away by circulating oil system heat control more easily. In the splash lubrication system, cooling coil can be used to control the oil temperature. Circulating oil lubrication system of oil available heat along with the following formula. 转k6 Cpρf Qoil = ( θo - θi) Among them: k6 = 1. 67 x 10 - 5 ( Qoil unit is W) = 1. 67 x 10 - 2 ( Qoil unit is BTU/min) If the loop is mineral oil, lubricating oil available heat along with the following formula: Qoil = k5 f ( θo - θi) The coefficient is suitable for heating and cooling formula of listed on this page. Among them: k5 = 28 ( Qoil unit is a W, f unit is L/min, theta unit is ° C) 。