What transmits the rotating motion of the cam to the rocker arm?

• A. Cam Follower
• B. Push Rod
• C. Timing Belt
• D. Camshaft

Answer: (A)

The cam follower is the part that directly turns the cam’s rotation into a movable action. As the camshaft lobe rotates, the follower rides on the lobe’s flat surface and is forced up and down, converting that rotary motion into linear displacement. That linear motion is then passed along to the rocker arm (usually via a push rod in many engines), causing the rocker arm to move and operate the valve. The other components have different roles: a timing belt merely transfers rotation between shafts, the camshaft provides the rotating lobes, and the push rod transmits the follower’s motion to the rocker arm rather than converting the cam’s rotation itself.