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Machinery and equipment in the gear transmission is the most common transmission mode,and the increasing demand gear of the modern machinery .The gear is not only required in high-speed, heavy, special media, and work in other harsh environmental conditions, but also required a high stable , high reliability and compact structure, good performance, so arouse more and more factors of failure. The gear fault is an important factor in inducing mechanical fault.Therefore, the gear fault diagnosis technology research is very important.
Gear because of different factors such as manufacturing, operation, maintenance and gear material, heat treatment,running state and so on , will produce different of abnormal forms.The common faults in gear have the following categories: