Exhaust port structure of internal combustion engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsMasahiko Minemi, Tsuneo Endoh, Tatsuya Nakagawa, Taizou Kitamura, Atsushi Baba
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Abstract
In an exhaust port structure in an internal combustion engine, a cylinder head has a cylinder head body and a cylindrical exhaust port liner. The exhaust port liner is partially supported at a plurality of points on the cylinder head body, and a heat-insulating layer exists around the exhaust port liner. Thus, it is possible to inhibit the propagation of heat from the exhaust port liner to the cylinder head body as much as possible.
Claims15
An exhaust port structure for an internal combustion engine, wherein a cylinder head has a cylinder head body and a cylindrical exhaust port liner, said exhaust port liner being partially supported at a plurality of points on said cylinder head body, and a heat-insulating layer is provided around said exhaust port liner, wherein said partially supporting points include a valve stem-insertion section having a valve stem-inserting bore defined therein through which a valve stem of an exhaust valve extends, wherein said valve stem also extends through a valve stem guide and a cylindrical seal member is interposed between said valve stem-insertion section and said valve stem guide.
Dependencies are inferred from the claim text.