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封闭式差动齿轮箱是一种特殊类型的行星传动装置，由于具有结构紧凑、单位重量传递功率大、速比大等优点，在机械上尤其在对传动装置的体积及重量有较严格要求的工程机械上广泛应用。目前国外此类产品已成系列，如德国 ＲＥＸＲＯＴＨ公司、美国 ＦＡＩＲＦＩＥＬＤ等公司的系
Closed differential gear box is a special type of planetary gear, due to its compact structure, the unit weight of the transmission power, the advantages of large speed ratio, especially in the mechanical transmission of the volume and weight have more stringent requirements Widely used in construction machinery. At present, such products have become a series of foreign countries, such as Germany REXROTH company, the United States FAIRFIELD other companies