吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (4): 1121-1129.doi: 10.13229/j.cnki.jdxbgxb201704016

• Orginal Article • Previous Articles     Next Articles

Spatial tooth profile design of harmonic drive by rack approximation method

WANG Jia-xu1, YUAN Pan1, TAN Chun-lin2, HE Yong-qiang2, LI Jun-yang1, XIAO Ke1   

  1. 1.State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400044, China;
    2.China Academy of Space Technology, Beijing 100094, China
  • Received:2016-03-10 Online:2017-07-20 Published:2017-07-20

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Abstract: To solve the problems of transmission precision reduction caused by large meshing backslash and tooth profile interference caused by axial coning in the design of involute tooth profile of harmonic drive, a tooth profile new design method of harmonic drive based on rack approximation method was presented. The method considers the actual meshing situation and takes advantage of rack approximation design to design and correct the approximate tooth profile based on the actual movement route of flexspline relative to circular spline. The flexspline coning caused by assembly deformation is also considered to design the spatial tooth profile of flexspline at sections other than the main section. Results show that the tooth profile of harmonic drive designed by the proposed method has very small backslash and very wide-range meshing. Non-interfering engagement at arbitrary section can be achieved under no-load condition by changing the thickness of the tooth bottom rim of flexspline based on linear relationship.

Key words: mechanical design, harmonic drive, rack approximation method, engagement theory, spatial tooth profile

CLC Number: 

  • TH132.43
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