1. Abnormal performance of shaft system and bearing structure
Axial movement: If the preload force of the internal bearing fails (such as improper torque of the lock nut), axial movement will occur in the shaft system, which will lead to uneven internal forces and abnormal loads.
High-speed shaft whistling and vibration: When the speed suddenly rises, if the bearing preload force is improperly adjusted (a torque wrench is not used to adjust it to the standard range), high-frequency whistling and vibration may easily occur.
Abnormal noise caused by alignment deviation: If there is a deviation in the concentricity/alignment accuracy of the internal shaft system or external coupling (such as radial deviation > 0.02mm, angular deviation > 0.05°), abnormal noise and abnormal vibration will occur during operation.
2. Abnormal performance of gear meshing and tooth surface structure
Abnormal vibration amplitude and frequency: When the internal gear load-bearing capacity is insufficiently estimated (such as module, tooth width and other parameters do not match) or there is eccentricity or backlash wandering, as the load increases, the gear meshing frequency and the amplitude of its multiplication will increase significantly (can increase by 30%-80%), and the distribution range and amplitude of the side frequency bands will also expand and increase.
Spectrum disorder caused by wear: If the internal tooth surface is worn due to structural or lubrication problems, the tooth side clearance increases, which will lead to uneven meshing stress and increased impact. At this time, the vibration amplitude shows a continuous upward trend (the radial amplitude can increase by 50%-80% during moderate wear), the "burrs" surrounding the meshing frequency on the spectrum chart increase, and the shape becomes messy.
3. Abnormal performance of the box and lubrication structure
Abnormal heat capacity and temperature rise: The B3SH series adopts a sound-absorbing box structure and a large surface area design. If the internal heat exceeds the natural heat dissipation capacity of the box (the heat capacity power condition is not met and an auxiliary cooling device is not installed), the lubricating oil temperature will be too high and deteriorate, which will intensify tooth surface friction and load abnormalities.
Failure of the lubrication system: If the internal lubrication structure (such as splash lubrication or forced lubrication system) fails, resulting in insufficient oil or failure to form a good oil film, it will directly cause dry friction on the tooth surface, accompanied by abnormal sounds from "sand" to "crunching", and the temperature rise rate will be significantly accelerated (5-10°C more per hour).
Damage to the sealing structure: If the internal oil seal is worn or the journal is scratched, oil leakage will occur at the shaft end. The loss of lubricant will directly destroy the internal force balance and cause chain load abnormalities.
