关键词: 根切, 微线段齿轮

Abstract: Undercut phenomenon of the logix gear is analyzed. The function to calculate the least tooth number of the logix gear avoiding undercut is developed. The least number doesn’t reach its maximum at the top of the gear tooth by the calculation, it reaches its maximum at the point near the middle of the tooth. Then it is testified by the computer simulation.

Key words: Logix gear, Undercut