The gear motor is an independent component composed of gear transmission, worm transmission and gear-worm transmission enclosed in the rigid shell. It plays the role of matching speed and transferring torque between the prime mover and working machine or actuator and is widely used in modern machinery. The abnormal sound and gearbox noise produced by the gear motor in use will affect the operating efficiency of the gear motor and even cause failure. According to the gear noise analysis, the main causes of the abnormal sound of the gear motor and the issues on how to solve it are as follows.
- Foreign Body in Planetary Gear Motor
The abnormal sound produced by foreign bodies in the planetary gear motor is clear and irregular, mainly because the foreign bodies such as small parts and assembly tools accidentally fall into the gear motor during the installation. If this happens, remove the foreign body and check the gear for damage.
- Parts Are Damaged And Fall off
The abnormal sound produced by parts damage and falling off is clear and irregular, because planetary gear motor often bears large load impact in operation and the long-term bearing of large load impact is easy to cause the damage and falling off of bearing, gear tooth, and other parts. Timely clean the parts which fall off, and replace the damaged parts.
- Large Bearing Clearance
Large bearing clearance means that the clearance between the roller and the inner and outer ring is too large. When working, the rolling element collides with the inner and outer ring, producing abnormal sound. The abnormal sound produced by large bearing clearance is clear, continuous and periodic, and raises following with the increase of rotating speed. The bearing is mainly composed of four parts: inner ring, outer ring, rolling element and cage.
- Gear Backlash Is Too Large
The abnormal noise turbidity caused by the large gear backlash usually occurs once the gear motor starts and disappears when conducting the continuous operation. During gear meshing transmission, in order to form lubricating oil film between meshing tooth profiles and avoid getting stuck because of gear tooth friction heating expansion, a gap must be left between tooth profiles, which is called gear backlash. If it is too small, thermal expansion will make the meshing gear stuck while if it is too large, it will produce a strong impact force once the teeth contact, thus producing the impulsive abnormal sound.
- The Inconcentricity between Parts
The abnormal sound produced by the inconcentricity between parts is turbid, continuous and periodic. In general, the concentricity between parts will not affect the product performance, but if this deviation exceeds the allowed range, it will produce abnormal sound and even affect the service life of the gear motor. The inconcentricity between parts results in the abnormal meshing of gear and uneven distribution of working load, generating the unbalanced force under which the abnormal sound will appear.
- Clash between Gears
This abnormal sound is particularly loud with the crashing sound which often sounds like “ka…” and is periodic. It is recommended to replace the gear and inner ring.
- Inadequate Lubricant
Since the gear motor is often installed in the equipment, the leakage of lubricant can not be found timely. This possibly leads to no lubricate protection between gears, which accelerates the gear damage and produces the abnormal sound.