Internal combustion engine fed with a stratified double charge

Claim 1

An internal-combustion engine fed with a stratified charge comprising means for injecting into a combustion chamber a main charge of a lean mixture of a first fuel and air, and an injection device, for injecting a second fuel into an ignition zone of the combustion chamber, comprising an injector holder and an injector mounted on said injector holder, said holder comprising a retaining element defining a fluid passage in said holder, a seat opposite said retaining element and a ball valve including a ball freely mounted with a given degree of clearance for movement between said retaining element and said seat, said retaining element being disposed in said holder closer to the combustion chamber, while said seat is integral with the holder and disposed closer to the injector such that the pressure in the combustion chamber at the end of the compression stroke and during ignition and the subsequent expansion stroke pushes the ball against its seat, thereby protecting the injector, with the retaining element being a baffle plate having two opposite flat lateral portions which define said fluid passage and said baffle plate being press-fitted in a bore in the injector holder.