Steel Rocker Arm Assembly

The Rocker Arm Assembly is a crucial component in internal combustion engines, responsible for converting the rotational motion of the camshaft into linear motion to operate the engine’s intake and exhaust valves. Typically manufactured from forged or cast steel, aluminum alloy, or high-strength sintered metal, the assembly consists of rocker arms, rocker shafts, pushrods, and related supports or bearings. It operates under high-temperature and high-pressure conditions, typically up to 150°C and engine speeds exceeding 6000 RPM. The rocker arms pivot on a shaft or individual studs, driven by cam lobes via pushrods or hydraulic lifters, ensuring precise valve timing and movement. Surface treatments such as nitriding, phosphate coating, or induction hardening are applied to reduce friction and wear. The assembly is usually lubricated through internal oil channels or splash lubrication from the engine’s lubrication system. Rocker arm assemblies are used in overhead valve (OHV), overhead camshaft (OHC), and single or double camshaft configurations. It is a non-electrical, mechanically driven unit that contributes to engine efficiency, combustion accuracy, and reduced valve noise. The components are often engineered to meet OEM standards such as SAE, ISO, or IATF for durability and performance.