Method for producing a built hollow valve
AssigneeMahle International GmbH
InventorsPeter Kroos, Christoph Luven, Alexander Mueller, Alexander Puck
Life of this patent
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Abstract
A method for producing a hollow valve of an internal combustion engine may include providing a hollow valve stem, a valve cone, and a valve bottom; pushing the valve cone over the valve stem via a press fit, wherein the valve cone includes an outer surface transitioning to the valve stem to define a testing surface; and welding the valve cone to the valve stem via at least one of a laser beam and an electron beam, wherein the welding occurs such that no melting of the outer surface in the region of the testing surface of the valve cone occurs.
Claims20
A method for producing a hollow valve of an internal combustion engine, comprising:
- providing a hollow valve stem, a valve cone and a valve bottom,
- pushing the valve cone over the valve stem via a press fit, wherein the valve cone includes an outer surface transitioning to the valve stem to define a testing surface, and
- welding the valve cone to the valve stem via at least one of a laser beam and an electron beam, wherein the welding occurs such that no melting of the outer surface in the region of the testing surface of the valve cone occurs.
A hollow valve of an internal combustion engine, comprising:
- a valve stem inserted through a valve cone via a press fit between the valve stem and valve cone, the valve cone including an outer surface transitioning to the valve stem to define a testing surface, wherein the valve cone is coupled to a valve bottom,
- wherein the press fit between valve stem and valve cone amounts to 0.02 mm to 0.11 mm, and the outer surface of the valve cone is welded to the valve stem to define a weld seam via at least one of a laser beam and an electron beam such that no melting of the testing surface of the valve cone occurs.
A method of assembling a hollow valve for an internal combustion engine, comprising:
- providing a hollow valve stem having an outer diameter, a valve cone having an outer surface defining an opening having an inner diameter, and a valve bottom;
- inserting the valve stem through the opening of the valve cone via a press fit between the valve stem and valve cone, the outer surface transitioning to the valve stem to define a testing surface, wherein the outer diameter of the valve stem is approximately 0.02 mm to 0.11 mm larger than the inner diameter of the opening of the valve cone;
- welding the valve cone to the valve stem via at least one of a laser beam and an electron beam, wherein at least one of the laser beam and electron beam is held at an angle of less than 25 degrees relative to an axis of the valve stem to produce a weld seam covered by the testing surface, wherein the testing surface defines a first axial depth and the weld seam defines a second axial depth.
Dependencies are inferred from the claim text.