| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary air supply structure capable of promoting reaction of unburnt gas and oxygen, by sufficiently promoting mixing of secondary air and the unburnt gas, by increasing a degree of freedom of a layout of a secondary air supply passage. <P>SOLUTION: A projecting part 46 is formed on an inner peripheral surface of an exhaust port 37 opposed to an injection hole 45a of the secondary air supply passage 45. The projecting part 46 has a collision surface for steering the secondary air to the valve seat 11a side by colliding the secondary air injected from the injection hole 45a. <P>COPYRIGHT: (C)2010,JPO&INPIT |
