Direct injected cylinder head
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsMinoru Yonezawa, Yuji Kinoshita
Life of this patent
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Abstract
A cylinder head construction for a direct injected internal combustion engine wherein a spark plug well is formed in the cylinder head and penetrates through its combustion chamber surface at the periphery of the combustion chamber. The opening of the nozzle receiving portion of the this well is relieved around the outer peripheral portion thereof so as to avoid the formation of an edge that can deteriorate through cracking.
Claims10
A cylinder head for a direct injected internal combustion engine, said cylinder head having a lower surface that is adapted to be held in sealing engagement with an associated cylinder block around its cylinder bore, said cylinder head lower surface being formed with a recessed area that forms, in part, the combustion chamber of the engine, and a fuel injector well formed in said cylinder head and terminating in a cylindrical opening that passes at least in part through said cylinder head combustion chamber surface, the inner peripheral portion of said fuel injector well opening at said cylinder head surface being formed with a relieved part that defines a curved surface comprised of a cylindrical segment that extends at an angle to the axis of said well opening so as to define a surface rather than an edge along this portion of the combustion chamber surface of the cylinder head.
A cylinder head for a direct injected internal combustion engine, said cylinder head having a lower surface that is adapted to be held in sealing engagement with an associated cylinder block around its cylinder bore, said cylinder head lower surface being formed with a recessed area that forms, in part, the combustion chamber of the engine, and a fuel injector well formed in said cylinder head and terminating in a cylindrical opening that passes at least in part through said cylinder head combustion chamber surface, the inner peripheral portion of said fuel injector well opening at said cylinder head surface being formed with a relieved part that defines a curved surface that extends at an angle to the axis of said well opening so as to define a surface rather than an edge along this portion of the combustion chamber surface of the cylinder head, said fuel injector having a nozzle portion that extends beyond said fuel injector well opening into said combustion chamber recess of said cylinder head for shielding said curved surface.
A cylinder head for a direct injected internal combustion engine, said cylinder head having a lower surface that is adapted to be held in sealing engagement with an associated cylinder block around its cylinder bore, said cylinder head lower surface being formed with a recessed area that forms, in part, the combustion chamber of the engine, and a fuel injector well formed in said cylinder head and terminating in a cylindrical opening that passes at least in part through said cylinder head combustion chamber surface, the inner peripheral portion of said fuel injector well opening at said cylinder head surface being formed with a relieved part that defines a curved surface that extends at an angle to the axis of said well opening so as to define a surface rather than an edge along this portion of the combustion chamber surface of the cylinder head, the combustion chamber side of said curved surface extending radially outwardly beyond the associated cylinder bore so as to be shielded by the associated cylinder block.
Dependencies are inferred from the claim text.