Which components are used to reduce friction and wear on gears?

• A. Bushings
• B. Sprockets
• C. Ball Bearings
• D. Cam Followers

Answer: (C)

Reducing friction and wear in rotating gear systems is achieved by using bearings that provide a smooth, rolling interface between the shaft and its support. Ball bearings accomplish this by placing rolling elements (balls) between inner and outer races. The balls roll as the shaft turns, converting most of the contact from sliding to rolling motion, which greatly lowers friction, reduces heat, and distributes loads more evenly. This rolling action minimizes wear on the mating surfaces and helps gears run more efficiently and for a longer life. Other options mentioned either rely on sliding contact or are not primarily used to lower friction in gear meshes, so they don’t offer the same level of wear reduction as ball bearings.