Abstract: A new sliding tooth precision gearing is put forward, whose spatial meshing group is consisted of face tooth–output frame–ball–input cam. It is characterized by adjustable back mesh, multi-teeth gearing, being able to realize precision transmission and so on. According to enveloping theory of single parametric curves and constant transmission ratio condition, theoretical profile equations of meshing parts are established; effects of cutter radius on profile are discussed; solutions to real profile and cutter center locus are studied in detail; example and numerical results are presented.

Key words: Conjugate tooth profile, Planetary gearing, Precision transmission, Sliding tooth gearing