Valve seat machined in several chamfers

摘要

The engine has a mouth (16) comprising a surface (44) with a revolution profile cylinder portion (48) and an infinite plane (62) perpendicular to an axis (X-X') of a valve seat (14) coupling a surface (40) of the mouth and the revolution profile cylinder portion. The revolution profile cylinder portion precedes a revolution profile frustum portion (46) in a direction oriented towards an exit surface (10), where the revolution profile cylinder portion is widen than the revolution profile frustum portion.