Swirl generation structure in Lean Burn Engine

摘要

The present invention improves the swirl generation efficiency according to the valve operation at a low speed, so that the combustion power at the high speed can be improved simultaneously with the combustion power at the lean air-fuel ratio as well as the fuel wetting prevention. In the swirl generation structure, the present invention is a swirl generation structure in a lean burn engine which is formed to clean the exhaust gas and save fuel according to the change of the intake flow, the intake port is connected to the cylinder head (3) An intake manifold (2) in which two intake holes (21) and (22) are formed in each cylinder, respectively, in the same shape communicating with the straight port (31) and the helical port (32); A control shaft 40 inserted through the center of the intake holes 21 and 22 and rotatably operated by a negative pressure induced from the surge tank 1; The summary is made into the structure comprised as the butterfly valve 4 fixedly extended by the control shaft 40 which penetrates the intake hole 21 of one side which communicates with the straight port 31. As shown in FIG.