| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine capable of securing the opening area of an intake valve sufficiently and utilizing the thermal energy of exhaust gas effectively. SOLUTION: An intake valve 9 of hollow structure opens and closes the intake valve hole 7 formed so as to face on a combustion chamber 5 in a cylinder head 3, and the exhaust valve hole 22 formed in the intake valve 9 is opened and closed by the exhaust valve 18 contained in the intake valve 9 coaxially. The valve hole 7 facing on the combustion chamber 5 is communicated with an intake port 8 directly, and the exhaust valve hole 22 is communicated with an exhaust port 14 through the exhaust passage 21 formed in the hollow intake valve 9. In this constitution, intake charge efficiency can be improved by securing the opening area of the intake valve 9 largely. Since the exhaust gas having just been discharged from the combustion chamber 5 is not brought into contact with the cylinder head 3 having large thermal capacity, the temperature lowering of the exhaust gas is minimized, leading to the effective utilization of waste heat.
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