Guide stud valve

1. An oriented valve ( 50 ) for a valve ignition prechamber ( 1 ) that is arranged in an internal combustion engine cylinder head ( 2 ) that covers a combustion chamber ( 3 ), said valve ignition prechamber ( 1 ) having a lamination cavity ( 4 ) in which emerges ignition means ( 5 ) and at least one lamination injector ( 6 ), said lamination cavity ( 4 ) being connected to the combustion chamber ( 3 ) by a lamination duct ( 7 ) that houses the oriented valve ( 50 ) in order to form with the oriented valve ( 50 ) a torch ignition prechamber ( 9 ) that connects the lamination cavity ( 4 ) with the combustion chamber ( 5 ) by means of at least one gas ejection orifice ( 16 ), the oriented valve ( 50 ) comprising:

a valve main body ( 8 ) housed with small play in the lamination duct ( 7 );

a closure axial face ( 10 ) arranged on the valve main body ( 8 ) and configured to rest in whole or in part on a duct closure seat ( 11 ) which the lamination duct ( 7 ) exhibits in order to close the lamination duct ( 7 ) and isolate the lamination cavity ( 4 ) from the combustion chamber ( 5 );

a centering peripheral surface ( 12 ) located at a periphery of the valve main body ( 8 ), said peripheral surface ( 12 ) being configured to contact an internal wall of the lamination duct ( 7 ) to center said valve main body ( 8 ) in said lamination duct ( 7 );

an opening axial face ( 13 ), which is arranged on the valve main body ( 8 ) opposite the closure axial face ( 10 ) and which is configured, when the closure axial face ( 10 ) does not rest on the duct closure seat ( 11 ), to bear on a chamber-side valve stop ( 14 ) arranged in the lamination duct ( 7 );

an orientation stud ( 15 ), which is fixedly secured to the valve main body ( 8 ) and which protrudes from the opening axial face ( 13 );

a guide axial orifice ( 17 ), arranged in or near the chamber-side valve stop ( 14 ) and in which is housed the orientation stud ( 15 ) with small radial play, said orientation stud ( 15 ) configured to slide longitudinally in said axial orifice ( 17 ) without ever completely coming out; and

a valve damping chamber ( 18 ) formed by the lamination duct ( 7 ), the opening axial face ( 13 ), and the chamber-side valve stop ( 14 ),

wherein a volume of said valve damping chamber ( 18 ) is maximum when the closure axial face ( 10 ) rests on the duct closure seat ( 11 ), and minimum when the opening axial face ( 13 ) rests on the chamber-side valve stop ( 14 ), and

wherein at least one gas throttling orifice ( 20 ) connects the valve damping chamber ( 18 ) and the combustion chamber ( 3 ) so that a gas ( 19 ) can flow between the valve damping chamber ( 18 ) and the combustion chamber ( 3 ) via said throttling orifice ( 20 ).

2. The oriented valve according to claim 1 , wherein the guide axial orifice ( 17 ) passes through the lamination duct ( 7 ) so as to connect the valve damping chamber ( 18 ) and the combustion chamber ( 3 ), so that a gas ( 19 ) can circulate between the valve damping chamber ( 18 ) and the combustion chamber ( 3 ) via the small radial play between the orientation stud ( 15 ) and the guide axial orifice ( 17 ).

3. The oriented valve according to claim 2 , wherein the orientation stud ( 15 ) comprises a damping shoulder ( 46 ) which cooperates with a damping counterbore ( 47 ) arranged at an inlet of the guide axial orifice ( 17 ), said damping counterbore ( 47 ) opening into the valve damping chamber ( 18 ).

4. The oriented valve according to claim 3 , wherein the damping counterbore ( 47 ) is directly or indirectly connected to the combustion chamber ( 3 ) by at least one depressurization duct ( 48 ).

5. The oriented valve according to claim 1 , wherein the gas ejection orifice ( 16 ) is connected to the torch ignition prechamber ( 9 ) by means of at least one gas ejection slot ( 22 ) arranged in the lamination duct ( 7 ) and in a vicinity of the duct closure seat ( 11 ).

6. The oriented valve according to claim 1 , wherein at least one of the valve main body ( 8 ) and the orientation stud ( 15 ) is attracted towards the lamination cavity ( 4 ) by a closure magnetic field source ( 23 ).

7. The oriented valve according to claim 6 , wherein the magnetic closing field source ( 23 ) consists of at least one closure permanent magnet ( 24 ) which produces a magnetic field, where said magnetic field can be either countered or amplified by a respectively opposite or matching magnetic field induced in a piloting coil core ( 37 ) by a magnetic field piloting coil ( 38 ).

8. The oriented valve according to claim 1 , wherein at least one of the valve main body ( 8 ) and the orientation stud ( 15 ) is attracted towards the chamber-side valve stop ( 14 ) by an opening magnetic field source ( 44 ).

9. The oriented valve according to claim 1 , wherein the lamination duct ( 7 ) comprises a directly-mounted non-magnetic sleeve ( 26 ), on which the duct closure seat ( 11 ) is arranged.

10. An oriented valve for a valve ignition prechamber ( 1 ) that is arranged in an internal combustion engine cylinder head ( 2 ) that covers a combustion chamber ( 3 ), said valve ignition prechamber ( 1 ) having a lamination cavity ( 4 ) in which emerges ignition means ( 5 ) and at least one lamination injector ( 6 ), said lamination cavity ( 4 ) being connected to the combustion chamber ( 3 ) by a lamination duct ( 7 ) that houses the oriented valve ( 50 ) in order to form with the oriented valve ( 50 ) a torch ignition prechamber ( 9 ) that connects the lamination cavity ( 4 ) with the combustion chamber ( 5 ) by means of at least one gas ejection orifice ( 16 ), the oriented valve ( 50 ) comprising:

a valve main body ( 8 ) housed with small play in the lamination duct ( 7 );

a closure axial face ( 10 ) arranged on the valve main body ( 8 ) and configured to rest in whole or in part on a duct closure seat ( 11 ) which the lamination duct ( 7 ) exhibits in order to close the lamination duct ( 7 ) and isolate the lamination cavity ( 4 ) from the combustion chamber ( 5 );

a centering peripheral surface ( 12 ) located at a periphery of the valve main body ( 8 ), said peripheral surface ( 12 ) being configured to contact an internal wall of the lamination duct ( 7 ) to center said valve main body ( 8 ) in said lamination duct ( 7 );

an opening axial face ( 13 ), which is arranged on the valve main body ( 8 ) opposite the closure axial face ( 10 ) and which is configured, when the closure axial face ( 10 ) does not rest on the duct closure seat ( 11 ), to bear on a chamber-side valve stop ( 14 ) arranged in the lamination duct ( 7 );

an orientation stud ( 15 ), which is fixedly secured to the valve main body ( 8 ) and which protrudes from the opening axial face ( 13 );

a guide axial orifice ( 17 ), arranged in or near the chamber-side valve stop ( 14 ) and in which is housed the orientation stud ( 15 ) with small radial play, said orientation stud ( 15 ) configured to slide longitudinally in said axial orifice ( 17 ) without ever completely coming out; and

a valve damping chamber ( 18 ) formed by the lamination duct ( 7 ), the opening axial face ( 13 ), and the chamber-side valve stop ( 14 ),

wherein a volume of said valve damping chamber ( 18 ) is maximum when the closure axial face ( 10 ) rests on the duct closure seat ( 11 ), and minimum when the opening axial face ( 13 ) rests on the chamber-side valve stop ( 14 ),

wherein the centering peripheral surface ( 12 ) has a conical profile ( 21 ).