What are the five failure modes of gear wheel drive?
2. tooth surface wearTooth wear is mainly due to dust and debris into the hard tooth surface caused by abrasive wear; the second is because each tooth surface friction running in wear. Wear after tooth lose correct shape (Figure 3 - 42), the shock and noise produced during operation abrasive. Wear in the open transmission is difficult to avoid. The closed transmission, improve the tooth surface roughness and keep good lubrication can prevent or reduce the wear.
The most important part of gear is the gear tooth. There are four main forms of its failure: tooth break, tooth surface wear, tooth surface pitting and scuffing of tooth surface1. broken teethBecause the stress on the tooth root is the greatest, and there is stress concentration, therefore, the fracture of the gear tooth usually occurs at the root of the toothIf the tooth unilateral work, root bending stress is tensile, the other side is compressed, the tooth is disengaged, the bending stress is zero. Therefore, in the repeated load, the bending stress exceeds the bending endurance limit, the root part will cause fatigue cracks. The crack gradually expand, will eventually cause the broken broken teeth, known as fatigue fracture.The sudden fracture of the gear due to short time overload or impact overload is called overload breaking. This kind of gear is easily broken by gears made of brittle materials such as hardened steel or cast iron
