Magnetic valve recoil device

A magnetic valve recoil device (42) for a valve-type ignition pre-chamber (1) for an internal combustion engine (2), said engine comprising a cylinder head (3) sitting on top of a cylinder (4) in order to form, together with a piston (31), a combustion chamber (5) into which a primary charge (30) may be introduced, said cylinder head (3) receiving a stratification cavity (6) to which, on the one hand, a stratification injector (8), which can inject an initiator charge (9), and, on the other hand, ignition means (11) lead, said cavity (6) being connected by a stratification pipe (7) to the combustion chamber (5) while a stratification valve (13) can either close said pipe (7) and isolate the stratification cavity (6) from the combustion chamber (5), with a cavity-side surface (14) of said valve (13) then resting on a valve closing seat (18) by means of a cavity-side valve bearing surface (19), or form, together with said pipe (7), a torch ignition pre-chamber (23) that causes the stratification cavity (6) to communicate with the combustion chamber (5) by means of at least one gas ejection orifice (24) that said pre-chamber (23) includes, with a chamber-side surface (15) of said valve (13) resting in this case on a valve opening seat (20) by means of a chamber-side valve bearing surface (21), characterized in that said device comprises:

• At least one magnetic material (43) constituting in whole or in part the stratification valve (13) and the stratification pipe (7);
• At least one source of a magnetic field (44) the magnetic flux (54) of which passes through the stratification valve (13) and the stratification pipe (7) so as to magnetize said valve (13) and said pipe (7).