| 摘要 |
<p>PURPOSE:To make a burnt gas subject to loop scavenging so favorably extending over almost the whole body of a combustion chamber, and thereby check any blow-by of fresh air as well as to control any intake resistance by covering an opening of each air feed valve to be situated in an area held by plural pieces of specific straight lines with each mask wall respectively. CONSTITUTION:Plural number of air feed valves 12, 13 are symmetrically set up in one side of a cylinder head inner wall surface 3a in relation to a symmetrical plane K-K including a cylinder axis. On the other hand, proper-numbered exhaust valves 9, 10 are set up at the other side of the inner wall surface 3a. In the above structure, two straight lines L1a, L2b, extend through a center C of the inner wall surface 3a from the shade center of these air feed valves 12, 13. In addition, each of two second straight lines L1a, L2b, the angle of which with the first straight line becomes the maximum, among each straight line extending so as to contact with an outer peripheral edge of the shade part of each exhaust valve being situated at the air feed valve side in relation to the symmetrical plane K-K from the shade part center likewise, is set up. Each opening of these air feed valves 12, 13 in an area held by respective straight lines is covered with each of mask walls 16 and 19.</p> |
