Development of Aluminum Alloy Roller Type Valve Rocker Arm by Casting and Forging Technique 890554
The following is a report on the process development and materials for rocker arms.
This process is called a “hybrid process” which combines a casting process for blanks and a forging process.
To obtain high durability, aluminum alloy was selected based on eutectic Al-Si adding Cu, Mg and Mn. As the fracture load is about 2 times higher than that of diecastings of the same shape, the mechanical properties have been remarkably improved by the “hybrid process.”
Presently, rocker arms are being produced by a mass production system, providing superior performance to the new cars of MAZDA.
Citation: Komatsu, S., Yahata, S., Fukui, K., and Tokoshima, T., "Development of Aluminum Alloy Roller Type Valve Rocker Arm by Casting and Forging Technique," SAE Technical Paper 890554, 1989, https://doi.org/10.4271/890554. Download Citation