Which component prevents reverse rotation of worm gear, roller chain and friction brake?

Which component prevents reverse rotation of worm gear, roller chain and friction brake?

• A. Backstop clutch
• B. Roller chain
• C. Stabilizer ring
• D. Pressure roller arm

Answer: (A)

A backstop clutch provides a one-way lock that prevents the drive from rotating in the opposite direction. In a worm gear arrangement, reverse rotation can occur if the load tries to back-drive the worm, which can cause unwanted motion or damage. The backstop clutch engages when rotation would be backward, effectively locking the shaft and stopping reverse motion, while still allowing forward operation. This makes it the appropriate device to protect the worm gear, roller chain, and friction brake from back‑driving forces. The other components don’t perform this locking function: a roller chain is just the transmission link, a stabilizer ring maintains alignment, and a pressure roller arm is part of a braking or tensioning mechanism but doesn’t prevent reverse rotation.

A backstop clutch provides a one-way lock that prevents the drive from rotating in the opposite direction. In a worm gear arrangement, reverse rotation can occur if the load tries to back-drive the worm, which can cause unwanted motion or damage. The backstop clutch engages when rotation would be backward, effectively locking the shaft and stopping reverse motion, while still allowing forward operation. This makes it the appropriate device to protect the worm gear, roller chain, and friction brake from back‑driving forces. The other components don’t perform this locking function: a roller chain is just the transmission link, a stabilizer ring maintains alignment, and a pressure roller arm is part of a braking or tensioning mechanism but doesn’t prevent reverse rotation.