What is the cause of gear failure in general

Update:14-05-2021
Summary:

1. Manufacturing errors Gear machining errors mainly in […]

1. Manufacturing errors
Gear machining errors mainly include eccentricity, pitch deviation and tooth profile errors. Eccentricity means that the geometric center of the gear (usually a rotating body) does not coincide with the center of rotation. Tooth pitch deviation refers to the large error between the actual tooth pitch of the gear and the nominal tooth pitch, and the tooth profile error refers to the large error of the involute tooth profile error.

2. Overload
For gear transmission equipment with unstable workload (such as ore crushers, mining machinery, etc.), overloads often occur. Without proper protection measures, gear teeth will be overloaded and broken, or long-term overload will cause many tooth root fatigue cracks and fractures.
3. Poor lubrication
For high-speed and heavy-duty gears, poor lubrication will cause overheating of the tooth surface, causing discoloration, bonding and other failures. There are many reasons for poor lubrication. In addition to the blockage of the oil circuit and the blockage of the oil injection hole, water in the lubricating oil, deterioration of the lubricating oil, and high oil temperature can cause poor lubrication of the tooth surface.


4. Assembly error
Improper gear assembly can cause deterioration of working conditions. When a pair of meshing gear shafts are not parallel, only one end of the tooth width will contact, or linear deviation of the gear will occur, so that the load on the gear is uneven in the tooth width direction and the dynamic torque cannot be transmitted smoothly. This situation is called "one-end contact", which will cause some teeth to be overloaded, which may lead to tooth rupture.
5. Operation error
Operation errors usually include lack of oil, overload, long-term overspeed, etc., which can cause gear damage and damage.

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