Helically-shaped intake port of an internal combustion engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsKiyoshi Nakanishi, Takeshi Okumura
Life of this patent
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Abstract
Helically-shaped intake port comprising a helical portion and an inlet passage portion which is tangentially connected to the helical portion and is slightly curved. The intake valve is arranged at the open outlet end of the helical portion. The upper wall of the helical portion extends to a helix terminating portion from the connecting position, and the inlet passage portion is connected to the helical portion. The height between the outlet open end and the upper wall of the helical portion, which is located at the helix terminating portion, is equal to or larger than the diameter of the outlet open end.
Claims12
A helically-shaped intake port of a spark-ignition internal combustion engine, which comprises:
- a helical portion having an open outlet end face;
- an intake valve arranged at said outlet end face, said helical portion being defined by an upper wall, an inner wall and a peripheral outer side wall which extends circumferentially about an axis of said intake valve;
- an inlet passage portion;
- a connecting portion tangentially connecting said inlet passage portion to said helical portion and having an open inlet end, said inlet passage portion being defined by an upper wall, a bottom wall, a first side wall arranged at a position near the axis of said intake valve, and having an inclined wall portion inclined in a direction such that the width of said inlet passage portion above the lower edge of the inclined wall portion at any point along said inlet passage portion is narrower than the width of said inlet passage portion below said inclined wall portion at said point and a second side wall arranged at a position remote from the axis of said intake valve and connected to the peripheral outer side wall of said helical portion;
- and a helix terminating portion, the upper wall of said helical portion extending to said helix terminating portion from the connecting portion, the height between said open outlet end face and the end portion of the upper wall of said helical portion, which is located at said helix terminating portion, being at least approximately as large as the diameter of said outlet end, the angle between the outlet end face and the end portion of the upper wall of said helical portion being less than about 20.degree..
Dependencies are inferred from the claim text.