Liquid-cooled internal combustion engine
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorAkihiko Okubo
Life of this patent
Estimating the term…
Abstract
An automotive vehicle powered by a multi-cylinder liquid cooled internal combustion engine. The engine is provided with a cooling jacket wherein localized quenching of the cylinder walls in the area of coolant inlet is reduced by providing a projection on the cylinder walls. In addition, equal coolant flow is provided around all cylinders by restricting the size of the discharge openings from the cylinder block to the cylinder head progressively toward the coolant inlet opening.
Claims21
A cooling arrangement for a liquid cooled internal combustion engine comprising an engine casting defining a combustion chamber portion having a generally cylindrical configuration surrounded at least in substantial part by a cooling jacket, and a coolant inlet opening formed in said engine casting and directed toward an internal wall that at least partially encircles said combustion chamber portion, said wall having a thickened portion in confronting relationship to said coolant inlet opening for reducing the likelihood of localized quenching of said wall and said combustion chamber portion.
A cooling arrangement for a liquid cooled internal combustion engine having an engine cylinder block casting forming at least in part a plurality of longitudinally spaced cylinder bores forming at least in part combustion chamber portions, a cooling jacket formed in said engine cylinder block casting at least in part surrounding said cylinder bores, said cylinder block casting having a surface adapted to be sealingly engaged with an engine cylinder head casting with said combustion chamber portions extending through said surface, said surface being formed with a plurality of coolant passages disposed around each of said combustion chamber portions, an coolant inlet formed at one end of said engine casting, and means for restricting the effective size of said coolant passages with those coolant passages at said one end of said engine being more restricted than those at the other end of said engine casting, the thickness of the walls of said cylinder block defining said cylinder bores being substantially equal to the thickness of said cooling jacket and wherein the transverse dimension of said coolant passages is substantially equal to the thickness of the walls and cooling jacket, said coolant passages comprising a plurality of circumferentially spaced openings in the surface disposed in alignment with the cooling jacket.
Dependencies are inferred from the claim text.