Engine piston and method for its manufacture

摘要

A piston for an internal combustion engine includes a textured, macroscopic, relief pattern on the inner and/or outer face of its skirt portion. The pattern improves heat transfer and oil flow, and decreases the weight of the piston, while maintaining or enhancing its strength. The pattern may be formed in the piston when it is molded, or it may be formed thereupon after molding by a chemical etch process.