Hydrogen combustion engine and passenger car and commercial vehicle

A hydrogen combustion engine for a commercial vehicle, comprising:

• at least one cylinder having a combustion chamber,
• a metallic hollow valve for the introduction of hydrogen into the combustion chamber or/and for directing exhaust gas out from the combustion chamber, wherein the hollow valve comprises a tubular valve shaft extending along an axial direction, which along the axial direction passes over into a valve plate with an enlarged external diameter compared to the valve shaft,
• wherein the valve shaft and the valve plate delimit a cavity,
• wherein a cavity diameter of the cavity, measured transversely to the axial direction in a region of the valve shaft is between 3.5 mm and 7 mm,
• wherein a wall thickness of the hollow valve, measured transversely to the axial direction in the region of the valve shaft is between 1.5 mm and 3.0 mm,
• wherein the cavity is at least partially filled with a cooling medium, and
• wherein in addition to the cooling medium, a non-evaporable getter alloy is present, which contains at least one of the following components:
• zirconium,
• vanadium,
• iron
• manganese, and
• at least one rare earth metal.

A hydrogen combustion engine for a commercial vehicle, comprising:

• at least one cylinder comprising a combustion chamber and a sintered or cast valve seat ring, surrounding a valve opening,
• a metallic hollow valve for the introduction of hydrogen into the combustion chamber or/and for directing exhaust gas out from the combustion chamber, wherein the hollow valve comprises a tubular valve shaft extending along an axial direction, which along the axial direction passes over into a valve plate with an enlarged external diameter compared to the valve shaft,
• wherein the valve shaft and the valve plate delimit a cavity,
• wherein a cavity diameter of the cavity, measured transversely to the axial direction in a region of the valve shaft is between 3.5 mm and 7 mm,
• wherein a wall thickness of the hollow valve, measured transversely to the axial direction in the region of the valve shaft is between 1.5 mm and 3.0 mm
• wherein the valve plate lies against the valve seat ring in a closed position of the hollow valve, and wherein the valve seat ring comprises a cobalt-based hard phase.