| 摘要 |
PURPOSE:To accelerate the atomization of injection fuel easily, and reduce the sticking of fuel to a diaphragm as well as to improve a combustion state ever so better, by making an intersection point between the diaphragm lying between two suction ports and a fuel injection center line of a fuel injection valve exist within the specified range. CONSTITUTION:A suction port 11 is formed into a Siamese connection type being branched off into two suction ports 11a and 11b by means of a diaphragm 15. And, on an upper part at the upstream side of the diaphragm 15, there is provided with a fuel injection valve 6, while a fuel injection center line 17 is set up so as to be crossed with a tip center part of the diaphragm 15. In this case, an intersection point C is set up so as to exist within a region A-B-B'-A' where a minimum section A-A' of a suction valve seat 18 is extended to the upstream side of the suction port 11 and the extended portion is projected on a vertical surface of a crankshaft. According to this method, injection fuel out of the fuel injection valve 16 collides with the diaphragm 15 at the intersection point C, riding on an air stream 33, and thus sucked inside a combustion chamber so speedily. |
