Analysis of Tooth Profile Tolerance in High-Precision End-Toothed Disc Design

End-toothed disc is an important part in the machine tools and construction machines. To realize quick and accurate positioning in the gear transmission system, high-precision end-toothed disc is essential. In this paper a new tolerance design approach for end-toothed disc is presented based on normal probability distribution model of tooth profile error. To describe the matching relationship between the structure parameters and tooth profile tolerance, the contact equation of a pair of end-toothed disc which evaluates the influence of each tooth structure parameters to the tolerance is derived. The results from this error analysis are utilized to innovate the indexing accuracy calculation model and to optimize the calibration procedure to ensure the tooth profile error in a given tolerance range. Contents and methods of this paper are useful theoretical references and practical guidance for the profile tolerance design of high-precision end-toothed disc.