INTERNAL COMBUSTION ENGINE WITH COMPRESSION IGNITION AND WITH A PRECOMBUSTION CHAMBER, PARTICULARLY FOR MOTOR VEHICLES

摘要

In an internal combustion engine with compression ignition having a precombustion chamber formed in an insert (28) housed in a hole (20) in the head (14) of each cylinder (10), the insert (28) has an annular outer rib (42) projecting radially from its upper end. The circumferential surface of the annular rib (42) is convex and engages by form locking with the concave, internal circumferential surface of retaining ring (44) the end faces of which bear respectively against an annular bearing seat (22) of the head (14) and against a stop part (26) of a fuel injector (24) which extends into the upper end of the insert (28). The insert (28) is subjected, in use, substantially solely to the circumferential or radially compression forces and is preferably of a ceramic material.