Planetary reducer is the core precision component of industrial transmission equipment. Its working temperature directly determines the equipment"s operating stability, service life and transmission accuracy. When the equipment is operating normally, the operating temperature must be strictly controlled below 90°C. Once overtemperature operation continues, it is an abnormal heating failure. Long-term high temperature will accelerate the aging of lubricating oil, increase the wear of gears and bearings, and reduce transmission efficiency. In severe cases, problems such as jamming, abnormal noise, locking, and component damage may occur, directly leading to equipment shutdown. Based on on-site operation and maintenance experience, the core causes of abnormal heating of reducers are mainly divided into four categories. The principles, hazards and targeted solutions of various faults are detailed as follows:
1. Excessive load (overload operation)
Excessive load is the most common cause of reducer heating failure. It means that the actual operating load of the equipment is greater than the rated load marked on the reducer nameplate for a long time, including instantaneous impact overload and long-term continuous overload. Under overload conditions, the core transmission components such as planetary gears, sun gears, internal ring gears and bearings inside the reducer bear pressure and friction far exceeding the design standards. The meshing resistance of the components increases significantly, and the mechanical friction loss increases sharply. The excess mechanical energy will continue to be converted into heat energy, causing the body temperature to rise rapidly.
Solution: Prioritize the optimization of equipment operating conditions, adjust production parameters, reduce the actual workload of the equipment, strictly control the load within the rated load range of the reducer, and prevent long-term overload and frequent impact load operation; if the production process cannot reduce the load, it means that the existing reducer specifications are too small. It is necessary to replace the planetary reducer with a larger specification and higher rated load according to the torque and speed requirements of the actual working conditions to match the equipment operation needs and eliminate the overload heating problem from the root.
Lubricating oil/grease is the "protective medium" inside the reducer. Its core function is to form a uniform oil film on the meshing running surfaces of gears and bearings, isolate the metal contact surfaces, reduce mechanical friction losses, and simultaneously have the functions of cooling, noise reduction, rust prevention, and buffering. Abnormal lubrication is the main cause of chronic heating of the reducer, which specifically includes three problems: First, insufficient lubricating oil, resulting in grease loss and leakage during long-term operation of the equipment, and the internal oil level is too low to fully cover the transmission components; second, the lubricating grease ages and deteriorates, and the grease appears oxidized, agglomerated, turbid, and has viscosity failure after long-term use, and loses its lubrication protection ability; third, the lubricating oil model does not match, and the high and low temperature adaptability and viscosity grade do not meet the requirements of the equipment working conditions, and an effective pressure-resistant oil film cannot be formed. The above problems will lead to direct dry friction or semi-dry friction of metal parts, and the friction heat will continue to accumulate, causing the equipment temperature to rise abnormally.
3. Poor heat dissipation
The high temperature caused by poor heat dissipation is a continuous accumulation of heat, which will accelerate the aging and failure of the internal lubricating grease, forming a vicious cycle of "high temperature - grease deterioration - increased friction - higher temperature", rapidly wearing out the core components of the equipment.
