In agricultural machinery, construction machinery and simple mechanical equipment, there are some gear drives without dust-proof covers or shells, and gear is completely exposed outside, which is called open gear transmission. This transmission is not only easily penetrated by external impurities, but also has poor lubrication, so the working conditions are not good, and the gear teeth are easy to wear, so it is only suitable for low speed  transmission. When the gear transmission is equipped with a simple shield, and sometimes the large gear part is immersed in the oil pool, it is called a semi open gear drive. Although its working conditions have been improved, it can not strictly prevent the invasion of external impurities, and the lubrication conditions are not the best.
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