Topic: Theory of Machines and Vibrations
In a single reduction, a large velocity ratio is required. The best transmission is
- A. Spur gear drive
- B. Helical gear drive
- C. Worm gear drive
- D. Bevel gear drive
Answer: C. Worm gear drive
Explanation: Worm gears and worm wheels can achieve very large velocity ratios in a single reduction stage compared to spur, helical, or bevel gears. So a worm gear drive is best when a large velocity ratio is required.