Wear performance of plastic gears based on asymmetric tooth profile

YANG Wei-song1,2, WANG Shu-kun1

（1.College of Mechanical and Electric Engineering, Changchun University of Science and Technology,
Changchun 130022, China; 2.Eastern Communications Co., Ltd., Hangzhou 310053, China）

Abstract: Aiming at the problems existing in the drive system of the large cash circulation module of financial machines and tools, the transmission precision is often reduced and the wear failure is occurred when the transmission system is required to be compact in structure, high in precision, large in torque, fast in speed and high in temperature, the asymmetric plastic gear with double pressure angle was adopted as the core part of the transmission system in one-way driving mechanism. The asymmetrical thermoplastic gear with double pressure angle of working face 35° and non-working face 20° was designed and compared with the existing standard pressure angle gear. On the basis that Matlab simulation software was used to model and analyze the factors that affect the wear of the working tooth surface of the asymmetric plastic gear, the gear wear was tested and verified by the test machine.The results show that the double pressure angle plastic gear with the increase of the pressure angle of the working face is superior to the standard gear in the aspects of sliding wear, thermal deformation wear and profile interference wear, and the wear resistance of the asymmetric gear with 35° profile of the working face is more than one time higher than that of the standard gear with 20° profile.

Key words: asymmetric plastic gear; wear failure; gear pressure angle; wear factor