Worm and worm gear transmission mechanism has the advantages of large transmission ratio, few parts, compact overall structure, small impact load during transmission, stable transmission, low noise and self-locking, but the disadvantages are large friction and wear of worm gear and high manufacturing cost. Using helical gear instead of worm gear to form cylindrical worm helical gear transmission mechanism can overcome this shortcoming and retain its original advantages.

The advantages of worm gear transmission mechanism are large transmission ratio, few parts, compact overall structure, small impact load during transmission, stable transmission, low noise and self-locking, while the disadvantages are large friction and wear and high manufacturing cost of worm gear. The cylindrical worm helical gear transmission mechanism with helical gear instead of worm gear overcomes these shortcomings well, while retaining the original advantages.

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