This part of GB/T 6931 specifies the terms, definitions and symbols of synchronous belt drives, which are suitable for mechanical drives with precise positioning and synchronization requirements.
GB/T 6931.3-2008 Referenced Document
GB/T 6931.1 Belt drives—Vocabulary—Part 1:Basic vocabulary*, 2020-03-31 Update
GB/T 6931.3-2008 history
2020GB/T 6931.3-2020 Belt drives—Vocabulary—Part 3:Synchronous belt drives
2008GB/T 6931.3-2008 Belt drives vocabulaty.Part 3:Synchronous belt drives vocabulary