| abstract |
An internal combustion engine is provided in which an exhaust port (16)ncommunicating with a combustion chamber (24) formed in a cylinder head (20)nis formed from independent exhaust ports (16A), which are positioned on thenupstream side, and a grouped exhaust port (16B), in which the plurality ofnindependent exhaust ports (16A) are combined. Water supplied from a supplynpump passes through a water passage (W1) of the grouped exhaust port (16B)nand a water passage (W2) of the independent exhaust ports (16A) whilencooling the exhaust port (16), and a valve seat (29) and valve guide (40) on thenperiphery of the exhaust port (16), which have high temperatures, thus heatingnthe water itself and thereby recovering waste heat of the internal combustionnengine. The heated water carries out heat exchange with exhaust gas in annevaporator provided in an exhaust passage and turns into high temperature,nhigh pressure steam, which drives an expander of a Rankine cycle system. It isnthereby possible to maximize the recovery of heat transferred from the exhaustnport (16) to the cylinder head (20) of the internal combustion engine. |