Answer :
Final answer:
In a push rod system, the component that is used but not present in an overhead camshaft system is the lifter, which translates the camshaft's motion to the push rod. While both systems utilize rocker arms and cam lobes, lifters specifically facilitate the push rod's movement. Understanding these differences helps in grasping how each system operates effectively in an engine.
Explanation:
Components in Push Rod and Overhead Camshaft Systems
A push rod system and an overhead camshaft (OHC) system are two types of valve actuation mechanisms in internal combustion engines, each having distinct components.
Key Differences in Components
1. Rocker Arm: Both systems may contain rocker arms, but they function differently. In a push rod system, the rocker arm is used to transfer motion from the push rod to the valve, while in an OHC system, the rocker arm is often not required as the camshaft is directly above the valve.
2. Cam Lobe: The cam lobe is fundamental to both systems. However, in a push rod system, the cam lobe interacts with a lifter that then pushes the push rod, changing its motion into a lateral one directed towards the rocker arm.
3. Valves: Both systems use valves, which are opened and closed to allow the mixture of air and fuel into the combustion chamber.
4. Lifters: Lifters (or followers) are components that are used in a push rod system. They are essential for translating the camshaft's rotary motion into linear motion of the push robs. In contrast, OHC systems often use adjustable followers directly associated with a camshaft without the need for lifters.
In summary, the component that is used in a push rod system but not in an overhead camshaft system is the lifter.
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