| 摘要 |
PROBLEM TO BE SOLVED: To provide a purge gas introduction path structure that can adequately agitate purge gas with a simple and compact structure.SOLUTION: A tubular part for connecting a throttle body is disposed on an intake manifold and a purge gas introduction path is disposed on the peripheral wall of the tubular part. A purge gas outflow path in the purge gas introduction path is disposed on a position which is opened adjacently to the throttle body on the inner surface of the peripheral wall, a purge gas inflow path is disposed on a position which is separated from the purge gas outflow path in the axial line direction of the tubular part and is opened, and a communication path which communicates both paths is disposed to be extended to the inner part of the peripheral wall. The purge introduction path can be lengthened as much as possible, the influence of pulsation due to a difference in the flow paths up to an air cylinder can be reduced, while being combined with an agitation effect due to turbulence immediately after the throttle body, the purge gas is substantially evenly mixed into intake air in such a stage as to be introduced to the intake manifold, a variation in the air-fuel ratio of a gas mixture between air cylinders is minimized, and the rotation of an engine can be stabilized. |
