Calculation of thermal power of planetary reducer

The planetary reducer power selection standard stipulated by our country has two parameters: one is the mechanical power, that is, the power determined under the strength conditions of the main components of the reducer (gears, shafts, etc.); It is the maximum power determined when the load at normal temperature and deceleration belt runs continuously to the allowable temperature of the thermal equilibrium state, which is an important indicator of the planetary reducer Selection.

The thermal power is the maximum power that the planetary reducer can continuously transmit within the specified lubricating oil equilibrium temperature range.The equilibrium temperature is the lubricating oil temperature at which the heat generated and dissipated by the lubricating oil in continuous operation is basically balanced, and the temperature rise basically stops.The thermal power depends on the efficiency of gear pairs, bearings, etc., working conditions, the maximum allowable oil tank temperature (lubricating oil temperature) and the cooling measures taken.The use of more than the thermal power means that the oil film is thinned or broken, which reduces its ability to resist pitting and gluing, and shortens the working life.

As the mechanical power of the planetary reducer increases, the proportion of its thermal power decreases, and the minimum is only about 20%.For the belt-driven reducer, due to the lack of proper heat dissipation measures, it can only make up for the limitation caused by the low thermal power by reducing the use of its mechanical power, so that it is in the state of 'big horse-drawn cart', otherwise, it will Lead to high working temperature, failure of lubrication system, and even mechanical heat damage, gear bonding, bearing burns, etc.This will only make the working ability of the machinery and equipment unable to be satisfactorily applied and brought into play, resulting in great waste.It can be seen that the increase of the thermal power of the reducer is closely related to the effective heat dissipation measures. In order to ensure a good heat dissipation effect, it is necessary to install a forced heat dissipation device on the reducer.In domestic industrial standards, Bapman Industrial Technology generally recommends that the reducer adopt oil pool lubrication, natural heat dissipation and forced cooling by a disc-shaped water head, while for the reducer with particularly high power, it emphasizes the use of circulating lubrication and cooling.

Be sure to determine the thermal power of the planetary reducer and apply it according to its thermal power, or take auxiliary cooling and heat dissipation measures to increase its thermal power so as to make better use of its mechanical power.

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