Method to relieve internal pressure of planetary reducer

When the planetary reducer is running at high speed, the temperature and pressure changes in the inner cavity directly affect its load rate, continuous rotation speed and service life.In order to ensure that the input end and output shaft of the planetary reducer are sealed bearings and sealing rings, but the sealed bearings and sealing rings will also affect the temperature and pressure changes in the internal cavity of the reducer.Therefore, under the premise of considering the cost, it is necessary to consider that moderate is to reduce temperature and blood pressure.The temperature and pressure limit the maximum rotation efficiency of the planetary reducer to 98%, and 2% of the input energy is turned into heat and lost.This kind of damage mainly comes from the friction of the sealing ring and the bearing, which will increase the temperature of the inner cavity of the planetary reducer.Sometimes the relatively high natural ambient temperature outside will also increase the temperature of the internal cavity of the reducer.The temperature of the inner cavity of the reducer immediately limits the output torque and output speed ratio.

There are many ways to reduce the pressure in the inner cavity of the planetary reducer:

One is to reduce the grease in the internal cavity of the planetary reducer model, but this may affect the long-term efficient operation and service life of the reducer.The grease will continue to move around after the reducer has been running for a period of time, which will cause the grease on the sun gear and planetary gear of the planetary reducer. As a result, the bearing capacity of the reducer will decrease during high-speed operation, which will reduce the rated output torque. .

The second is to discharge the high-pressure gas inside the reducer to the outside of the reducer.However, it is necessary to ensure the safe operation of the reducer, and according to environmental protection regulations, no oil, welding fumes, etc. should be discharged to the outside world. In addition, IP65 moisture-proof, anti-fouling, waterproof and other safety protection regulations must be considered.Of course everyone thought of adding unilateral valves.But this is not suitable for planetary reducers with small size, high load rate, high rotation efficiency and high reliability.