Planetary reducers are mainly composed of single-stage or multi-stage planetary gear systems, which have the characteristics of compact structure, small volume, and high transmission efficiency. Abnormal noise is a common and frequent problem with gearboxes; Due to the heavy load and harsh working environment of planetary gearboxes, it is easier to cause abnormal noise. There are four main reasons for abnormal noise in planetary gearboxes:
1. There are foreign objects inside the body
This abnormal noise is clear and irregular, mainly due to foreign objects (such as small parts, assembly tools, etc.) accidentally falling into the gearbox during assembly. If the above situation occurs, the foreign object should be removed and the gear should be checked for damage.
2. Damaged and detached components
This abnormal noise is clear and irregular because planetary gearboxes often receive large load impacts, which can cause damage and detachment of components such as bearings and gear teeth under the continuous effect of the load. The damaged parts fall off inside the body, causing abnormal noise. It is necessary to promptly clean the detached parts inside the body and replace damaged parts.
3. Large bearing clearance
This abnormal noise is clear, continuous, periodic, and increases with the increase of speed. The bearing is mainly composed of four parts: inner ring, outer ring, rolling body, and cage. Large bearing clearance refers to the excessive gap between the roller and the inner and outer rings. During homework, the rolling body collided with the inner and outer rings, causing abnormal noise.
4. The clearance between gear teeth is too large
This abnormal noise is cloudy and usually occurs immediately when the gearbox is started, and disappears during continuous operation. In gear meshing transmission, in order to form a smooth oil film between the meshing tooth profiles and prevent them from getting stuck due to thermal expansion caused by tooth collision, it is necessary to leave a gap between the tooth profiles, which is called tooth flank gap. If the tooth clearance is too small, heating and expansion can cause the meshing gears to get stuck; But if the gap is too large, a strong impact will occur when the gear teeth touch force, causing an impact noise.