US 6,971,344 B2 · Internal combustion engine

Abstract

An internal combustion engine is provided in which an intake valve, which opens and closes an intake valve hole formed in a cylinder head facing a combustion chamber has a hollow structure. An exhaust valve hole formed in the intake valve is made to open and close by an exhaust valve coaxially housed within the intake valve. The intake valve hole communicates directly with an intake port, and the exhaust valve hole coniniunicates with an exhaust port via an exhaust passage formed within the hollow intake valve. This ensures that the intake valve has a large opening area, thus increasing the intake charging efficiency. Furthermore, since exhaust gas coming out of the combustion chamber does not make direct contact with the cylinder head, which has a large heat capacity, any decrease in temperature of the exhaust gas can be minimized, thereby utilizing waste heat effectively.

Claims14

Dependent claims

An internal combustion engine comprising:

a cylinder head;
a combustion chamber facing the cylinder head;
an intake port formed in the cylinder head;
an intake valve hole formed in the cylinder head and providing communication between the intake port and the combustion chamber;
an intake valve supported in the cylinder head and opening and closing the intake valve hole;
an exhaust passage formed axially within the intake valve;
an exhaust valve hole formed in the intake valve and providing communication between the exhaust passage and the combustion chamber;
an exhaust valve coaxially supported within the intake valve and opening and closing the exhaust valve hole;
an exhaust port formed in the cylinder head and communicating with the exhaust passage;
and
a heat exchanger disposed in the exhaust port.

8 more elements

Dependencies are inferred from the claim text.

Internal combustion engine

Life of this patent

Internal combustion engine

Life of this patent

Abstract

Claims14