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On the Meshing Efficiency of 2K-2H Type Planetary Gear Reducer

This paper proposes 2K–2H type planetary gear reducer and analyzes its meshing efficiency. First, according to the concept of train value equation, the kinematic design of 2K–2H type planetary gear reducers is carried out. Three 2K–2H type planetary gear reducers are designed to illustrate the design algorithm. Then, based on the latent power theorem, the meshing efficiency equation of 2K–2H type planetary gear reducer is derived. According to the meshing efficiency equation, the meshing efficiencies of 2K–2H type planetary gear reducers are analyzed. The 2K–2H type planetary gear reducer has the following characteristics. (1) There is a power circulation in 2K–2H type planetary gear reducer. (2) Larger reduction ratio makes less meshing efficiency. (3) For the same reduction ratio, larger value ξ 42   ( ξ α ) will get better meshing efficiency. (4) For 2K–2H type planetary gear reducer, the quality of gears is an important factor. (5) The efficiency of gears manufactured by grinding is only improved by 1.5%; however, meshing efficiency of 2K–2H type planetary gear reducer is improved by 28%~44.8%.