Abstract： In order to renew the pumping stations, in which the pumps are directly linked with motor, a new type of transmission device was proposed due to its advantage of variable speed. This new device consists of a planetary gear transmission and a gear reduction. The planetary gear transmission is composed of a 2X-H planet bar, two clutches and two brakes which control the power input. Based on the analysis of movement of planetary gears, the transmission ratio for each step was conducted. The final planetary gear drive transmission design was determined by the calculation and analysis of two kinds of planet tooth number matching. As a result, a motor with 1 500 r/min was selected and two transmission ratios of 3 and 1.5 were decided. Through the right matching of planet tooth numbers, the speed requirement of 250 r/min and 125 r/min for the pump station was achieved. This design can also meet the need of frequent changes of pump in flow and head in the big project of “South to North Water Transfer”.
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