The load critical value of JZQ200 bearing damage can be determined according to the following indicators, which facilitates quick investigation and prevention.
1. Load critical value (by priority)
The rated output torque is rated ≈350 N·m (input 1500 rpm); if it exceeds 1.2 times (≈420 N·m) in the long term or 1.5 times (≈525 N·m) in the short term, the bearing is prone to fatigue pitting/fragmentation.
Bearing dynamic load rating: Common bearings (such as 305/6305) have a dynamic load rating of ≈19.5 kN; equivalent dynamic load P>1.1 times the dynamic load rating (≈21.5 kN), and the service life is significantly shortened.
Power overload rated input power ≈2.2 kW (1500 rpm); if it exceeds 1.2 times (≈2.64 kW) for a long time or exceeds 1.8 times (≈3.96 kW) under impact, the oil temperature and vibration will increase sharply.
Vibration and temperature threshold vibration acceleration >2.5 m/s² or high frequency (>1 kHz) sudden increase; bearing temperature >80℃ or temperature rise >40℃, indicating lubrication failure and increased overload.
2. Key factors affecting critical value
Lubrication status : Improper oil level, too high/low viscosity, and deterioration of oil quality will reduce the critical value by 15%–30%.
Operating speed : The speed exceeds the rated speed by 1.1 times, the bearing load coefficient increases, and the critical value decreases by 10%–20%.
Impact and starting : Frequent starts and stops, sudden load changes, and instantaneous loads can reach 2-3 times the rated value, which can easily lead to rolling element/raceway collapse.
Bearing wear : Damage to the raceway/rolling element surface reduces the rated dynamic load by 20%–50%.
3. Prevention and monitoring suggestions
load control
The rated torque should not exceed 1.2 times in long-term operation and 1.5 times in short-term operation. A buffer device should be installed under impact conditions.
Lubrication management
Check the oil level regularly (oil window 1/2–2/3), select gear oil with appropriate viscosity according to the ambient temperature, and change the oil after 2000 hours of operation.
Condition monitoring
Record the bearing temperature and vibration every hour. If the value exceeds the threshold, immediately reduce the load or shut down for inspection.
Bearing maintenance
Regularly check bearing clearance and wear, and replace them promptly if abnormalities are found to avoid chain damage.
4. Quick judgment process
Measure the output torque and reduce the load immediately if it exceeds 1.2 times the rated value.
Check the bearing temperature and vibration, and stop the machine to check the lubrication and load if it exceeds the threshold.
Check the oil quality and oil level. If abnormal, replace or replenish the lubricating oil.
If the bearing has abnormal noise, temperature rise or vibration, disassemble it, check and replace the bearing.
