Heating and heat dissipation of cylindrical roller bearing

Heat dissipation: how to determine the heat flux of bearings in special applications is a complex problem. Generally speaking, it can be considered that the factors affecting the heat dissipation rate include: 1. Temperature gradient from bearing to bearing seat. This factor is affected by the size of the bearing pedestal and external cooling devices (e.g. fans, water coolers, etc.). 2. Temperature gradient from bearing to shaft. All other heat sources, such as gears and other bearings and adjacent components, affect the temperature of the shaft. 3. Heat taken away by circulating oil lubrication system. To some extent, factors 1 and 2 can vary depending on the application. The heat dissipation modes include heat conduction in the system, convection on the inner and outer surfaces, and heat radiation between adjacent structures. In many applications, heat dissipation can be divided into two parts - the heat taken away by the circulating oil and the heat emitted by the structure. It is easy to control the heat carried away by lubricating oil through circulating oil system. In the splash lubrication system, the temperature of the lubricating oil can be controlled by the cooling rotary tube.

The heat carried away by the lubricating oil in the circulating oil lubrication system can be calculated by the following formula. Qoil = K6 CP ρ f (θ o - θ I) where: K6 = 1.67 x 10-5 (the unit of qoil is w) = 1.67 x 10-2 (the unit of qoil is BTU / min). If the circulating lubricating oil is mineral oil, the heat removed can be calculated by the following formula: qoil = K5 f (θ o - θ I). The following coefficients are applicable to the heating and heat dissipation formula listed in this page. Where: K5 = 28 (qoil unit is w, F unit is L / min, θ unit is ° C).