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US 4,825,816 AGranted
Engine with forced air-cooling
AssigneeKubota Corporation
InventorsKiichiro Yamada, Tsuyoshi Nishida
Life of this patent
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AssigneeKubota Corporation
InventorsKiichiro Yamada, Tsuyoshi Nishida
Estimating the term…
In a forced air-cooled engine, a local high temperature portion is adapted to be cooled effectively so that thermal distortion and thermal breakage of a cylinder and/or a cylinder head caused by such a local high temperature can be avoided. To prevent thermal distortion of the engine, there is provided a cylinder jacket, for cooling part of an engine cylinder in a partition wall between the cylinder and its push rod chamber. As means for preventing the thermal distortion of the cylinder head, there is provided a cooling air passage in a cylinder head, and there is also provided a head jacket for oil-cooling around a divided combustion chamber so as to circulate oil through the head jacket and a radiator. Local high temperature portions in the cylinder and/or the cylinder head can thus be oil-cooled effectively.
An overhead-valve type forced air-cooled engine having a cooling fan for the engine, a forced lubrication system and a cylinder block on which a cylinder head is secured and which has a push rod chamber formed in parallel with a cylinder thereof and fins provided therearound so as to be supplied with cooling air flows generated by a cooling fan in order to cool the cylinder, comprising:
A divided chamber type forced air-cooled engine having a radiator, a cooling fan provided for cooling the engine and a cylinder head secured on a cylinder block, said cylinder head being provided with a divided combustion chamber and a cooling air passage which being supplied with cooling air flows generated by the cooling fan so as to cool the cylinder head, comprising:
Dependencies are inferred from the claim text.