Kolben.

摘要

Pistons and a method for their manufacture are described. The piston has at least one piston ring groove reinforcing member (12) being annular in form and having, in cross-section, upper and lower, generally radially extending face portions (14,16) and a radially inner, generally axially extending face portion (18) between the two generally radially extending face portions (14,16), the generally axially extending face portion (18) being coated with particulate material by a physical vapour deposition technique, to provide a porous adhesion assisting layer (24).