| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust manifold that maintains the EGR ratio constant irrespective of a change in the shape of the exhaust manifold. <P>SOLUTION: An exhaust manifold 1 includes: exhaust gas inlet sections 10 connected to the exhaust ports of respective cylinders of the engine; a main pipe section 20 connected to the exhaust gas inlet sections 10 and configured to collect exhaust gas entering from the exhaust gas inlet sections 10; an EGR gas extraction section 30 for extracting, as EGR gas, a part of the exhaust gas; and an exhaust gas discharge section 40 for discharging the exhaust gas. The main pipe section 20 has formed thereon a curved section 21 provided between the exhaust gas inlet sections 10a, 10b and curved in a shape protruding to the side opposite the exhaust gas inlet sections 10. The curved section 21 is formed by causing a portion of the outer peripheral surface to be recessed toward the inside. The EGR gas extraction section 30 is extended from a portion of the outer peripheral surface of the curved section 21. The center of the inlet opening portion of the EGR gas extraction section 30 is disposed so as to be offset from the longitudinal center axis of the main pipe section 20. <P>COPYRIGHT: (C)2012,JPO&INPIT |
