The high power density is always one of important goals of the gear box.The invented planetary transmission mechanism of spiral bevel gears has the advantages of the spiral bevel gears transmission and the planetary gear transmission

compact structure

high power density.The driving principles of the planetary transmission mechanism are introduced.The calculation formulas derivations of the transmission ratio and transmission efficiency are done.The primal driving tests of the gear box are carried out.The results provide a possibility for the design of the high performance gear box.