Prechamber device for internal combustion engine

A prechamber device for an internal combustion engine, comprising:

• a shell formed of a first material;
• and
• a core inside the shell, the core having a higher thermal conductivity than the first material,
• wherein the shell includes:
• an interior wall having an internal surface opposite an external surface, the internal surface defining a chamber;
• an exterior wall having an internal surface opposite an external surface, the exterior wall having an opening providing fluid communication between the internal surface and the external surface of the exterior wall;
• and
• a distal end connecting the interior wall and the exterior wall, the distal end having an internal surface opposite an external surface, the external surface of the interior wall, the internal surface of the distal end, and the internal surface of the exterior wall defining a cavity between the interior wall and the exterior wall, and
• wherein the core is positioned within the cavity in physical contact with the external surface of the interior wall and the internal surface of the exterior wall, and the core is exposed to an exterior of the prechamber device through the opening of the exterior wall.

An internal combustion engine, comprising:

• an engine body;
• a combustion chamber formed within the engine body;
• a piston mounted in the engine body proximate the combustion chamber;
• a combustion igniter mounted in a combustion igniter chamber on the engine body and including an igniter element;
• a plurality of coolant flow passages that contain a liquid coolant formed within the engine body;
• and
• a prechamber device positioned between the combustion igniter and the combustion chamber, the prechamber device including:
• a shell formed of a first material;
• and
• a core inside the shell, the core having a higher thermal conductivity than the shell,
• wherein the shell includes:
• an interior wall having an internal surface opposite an external surface, the internal surface defining a chamber;
• an exterior wall having an internal surface opposite an external surface, the exterior wall having an opening providing fluid communication between the internal surface and the external surface of the exterior wall;
• and
• a distal end connecting the interior wall and the exterior wall, the distal end having an internal surface opposite an external surface, the external surface of the interior wall, the internal surface of the distal end, and the internal surface of the exterior wall defining a cavity between the interior wall and the exterior wall, and
• wherein the core is positioned within the cavity in physical contact with the external surface of the interior wall and the internal surface of the exterior wall, and the core is exposed to an exterior of the prechamber device through the opening of the exterior wall.

A method of making a prechamber device for an internal combustion engine, the method comprising:

• introducing a core in a fluid state into a cavity of a shell formed of a first material, the core having a higher thermal conductivity than the first material,
• wherein the shell includes:
• an interior wall having an internal surface opposite an external surface, the internal surface defining a chamber;
• an exterior wall having an internal surface opposite an external surface, the exterior wall having an opening providing fluid communication between the internal surface and the external surface of the exterior wall;
• and
• a distal end connecting the interior wall and the exterior wall, the distal end having an internal surface opposite an external surface, the external surface of the interior wall, the internal surface of the distal end, and the internal surface of the exterior wall defining a cavity between the interior wall and the exterior wall, and
• wherein the core is positioned within the cavity in physical contact with the external surface of the interior wall and the internal surface of the exterior wall, and the core is exposed to an exterior of the prechamber device through the opening of the exterior wall.