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Causes of tooth fracture

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A broken tooth is usually formed by the gradual extension of a fine crack. According to the crack growth and fracture reasons, the fracture can be divided into overload fracture (including impact frac
A broken tooth is usually formed by the gradual extension of a fine crack. According to the crack growth and fracture reasons, the fracture can be divided into overload fracture (including impact fracture), fatigue fracture and random fracture.
Overload fracture is always caused by the stress acting on the tooth exceeding its ultimate stress, resulting in rapid expansion of the crack. Common causes include sudden impact overload, bearing damage, shaft bending or large hard objects squeezing into the mesh area. The fracture surface of the broken tooth has a crack growth area with radiative pattern. After careful inspection, we can see the defect of the material, the precision of tooth surface is too poor, and the root of tooth is not processed. In the design, necessary measures should be taken to fully consider the prevention of overload. Prevent the box body from deformation, prevent hard foreign matter into the box body and so on.


The root cause of fatigue fracture is that the fatigue cracks of the gear teeth start from the fatigue source of the dangerous section (such as the tooth root) under the repeated action of excessive alternating stress, which makes the stress on the residual section of the gear teeth exceed its limit stress and cause instantaneous fracture. In the origin of fatigue fracture, it is the starting point for the expansion of the shellfish and radiates outwards. The causes are inadequate load estimation, improper material selection, low gear accuracy, thermal cracking, burn grinding, and root stress concentration. Therefore, the dynamic load spectrum of transmission should be fully considered in the design, gear parameters should be optimized, materials and gear accuracy should be correctly selected, and stress concentration factors should be eliminated by fully ensuring machining accuracy.Random fracture is usually caused by material defects, local stress caused by pitting, spalling, or other stress concentration, or by large hard foreign matter falling into the mesh area.

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