Nested cylinder head
AssigneeFca US LLC
InventorsPatrick H Baer, Constantin Hagiu, Christopher Capitan
Life of this patent
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Abstract
A cylinder head assembly for an internal combustion engine includes a cast cylinder head defining a combustion chamber and fabricated from a first material, and an internal support structure at least partially encapsulated within the cast cylinder head. The internal support structure is fabricated from a thermal strain and fatigue resistant second material, different from the first material, such that during engine operation, thermal and mechanical loads are transferred to the internal support structure to reduce combustion chamber displacement. The internal support structure and the cylinder head are bonded via a hot isostatic pressing (HIP) process to eliminate internal porosity and gaps therebetween.
Claims19
A cylinder head assembly for an internal combustion engine, comprising:
- a cast cylinder head defining a combustion chamber and fabricated from a first material;
- and
- an internal support structure at least partially encapsulated within the cast cylinder head,
- wherein the internal support structure is fabricated from a thermal strain and fatigue resistant second material, different from the first material, such that during engine operation, thermal and mechanical loads are transferred to the internal support structure to reduce combustion chamber displacement, and
- wherein the internal support structure and the cylinder head are bonded via a hot isostatic pressing (HIP) process to eliminate internal porosity and gaps therebetween.
A method of manufacturing a cylinder head assembly for an internal combustion engine, comprising:
- forming an internal support structure;
- casting a cylinder head defining a combustion chamber from a first material;
- at least partially encapsulating the internal support structure in the cylinder head casting, the internal support structure fabricated from a thermal strain and fatigue resistant second material, different from the first material, such that during engine operation, thermal and mechanical loads are transferred to the internal support structure to reduce combustion chamber displacement;
- and
- subjecting the internal support structure and the cylinder head to a hot isostatic pressing (HIP) process to bond the first and second materials to eliminate internal porosity and gaps therebetween.
Dependencies are inferred from the claim text.