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       when designing worm drive, the type of worm drive shall be reasonably selected based on the characteristics of various worm drives, the requirements of transmission and the conditions of use, and the functional requirements.

      1. for important transmission with heavy load, high speed, high efficiency and high precision, circular cylindrical worm (zc worm) transmission or enveloping hourglass worm transmission can be selected. 2. for high-power transmission requiring high transmission efficiency and non-grinding worm, toroidal worm drive can be selected. 3. for the transmission with high speed, high precision and large number of worm heads, and simple processing technology, involute cylindrical worm (zi worm) transmission, conical enveloping worm (zk worm) transmission or normal straight profile worm (zn worm) transmission can be selected.

      4. archimedes cylindrical worm (za worm) transmission can be selected for the transmission with small load, low speed, low accuracy requirements or less important, and when the worm is required to be processed easily. 5. for the low speed and light load transmission that requires self-locking, the single-head archimedean cylindrical worm (za worm) transmission can be selected. jinli transmission provides core transmission scheme for ai!