What is a Rocker Arm Shaft?
Author: ETP Date Posted:18 May 2023
Many drivers often remain unaware of the intricacies of key components in their vehicles, such as valves, piston rings, and tappets. Even automotive professionals occasionally encounter engine parts whose functions are unclear or difficult to remember. One such component is the engine rocker arm shaft.
Understanding the Engine Rocker Arm's Role
The rocker arm shaft serves the critical function of transmitting the movement of the camshaft to the intake and exhaust valves of the engine. This process involves direct contact between the rocker arm and the tappets, facilitating the transfer of motion in accordance with the camshaft's movement.
While one end of the rocker arm shaft makes direct contact with the tappet, the other end is connected to the intake and exhaust valves. When activated by the camshaft's cam, the rocker arm lowers on one side, opening the corresponding valve to allow the air-fuel mixture to enter the combustion chamber.
This movement occurs for both the intake and exhaust valves. Subsequently, a spring supports the valve's displacement, ensuring its return to the initial position. The springs must be durable enough to withstand high engine rotations, considering that this process occurs at extreme speeds while maintaining constant contact with the rocker arms.
Like most engine parts, rocker arm shafts are manufactured using materials and specifications recommended by global engineering standards. Typically, high-quality alloy steels are utilised, ensuring enhanced strength and extended lifespan for the engine.
Flat vs. Roller Rocker Arm: Understanding the Variations
It is important to note that there are currently two distinct types of rocker arms available on the market: flat traditional rocker arms and roller rocker arms. While flat rocker arms are the conventional choice, roller rocker arms are gaining popularity among consumers.
Roller technology, implemented in certain engines, facilitates synchronous transmission between the camshaft, hydraulic tappets, and valves by utilising rolling effects (rollers) between the rocker arms and the cam. This innovative approach significantly reduces friction, leading to improved overall efficiency and enhanced performance.
Achieving this efficiency is made possible by employing advanced micro-fusion processes with special alloy compositions, along with meticulously controlled heat treatments that the roller rocker arm undergoes. The result is a roller rocker arm made of specially tempered and ground steel.
It is crucial not to overlook the importance of efficient lubrication for ensuring the optimal performance and durability of rocker arm components. Consequently, it is recommended to regularly inspect the lubrication hole on this part for any signs of blockage.
By now, we hope that you have gained a clearer understanding of the engine rocker arm's vital functions within a car's engine. ETP stocks a range of new rocker arm shafts for Toyota engines. Shop our collection on our online store.
