| 摘要 |
PURPOSE:To form a swirl in an engine and improve its combustion atomization and intake efficiency, by arranging a small pipe, which extends its one end to about an intake valve forming the swirl, on the center axis in a pipe in the vicinity of an intake port and closely attachably providing an elastic wall, whose inside communicates with the atmosphere, to the periphery of the small pipe in its peripheral intake pipe wall. CONSTITUTION:An engine, providing a pipe 16 on the center axial line in an intake pipe in the vicinity of an intake port having an intake valve 7, has many holes 18 in the upstream side of the pipe 16 while extends its downstream side to a part in the vicinity of the intake valve 7. The engine, providing an elastic wall 11 in an intake pipe wall in the periphery of the pipe 16, introduces the atmospheric air from a pipe 19 through an air filter into a part between the intake pipe wall and the elastic wall 11. Intake air is allowed to flow only in the pipe 16, forming a strong swirl further improving atomization because the elastic wall 11 is inflated by the negative pressure in the intake pipe and brought into contact with the periphery of the pipe 16 when a throttle valve 8 is placed in a small opening. As the opening of the throttle valve 8 increases the negative pressure of the intake pipe decreases, and the engine, increasing an internal contour of the elastic wall 11 and reducing intake resistance, decreases also the swirl. |
