| 摘要 |
PURPOSE: A cooling system of an engine is provided to prevent knocking by thermal loads and a spark plug from being damaged and to improve durability by increasing cooling efficiency partially around a combustion chamber of a cylinder head. CONSTITUTION: A water jacket(5) is formed in a cylinder block(1) and a cylinder head(3). An engine cooling system receives cooling water from a radiator through a water pump to cool an engine. An auxiliary cooling device is placed from the cylinder head to the side of the water jacket between the spark plug and an exhaust port(11) to bypass low-temperature cooling water from the water pump and inject into the water jacket directly. The local cooling efficiency is increased around a combustion chamber(13) of the cylinder head. The low-temperature cooling water is injected from the water pump into the water jacket between the spark plug and the exhaust port through a nozzle part(25) of a water jet pipe(23).
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