Inlet port for internal combustion engine
An internal combustion engine is described consisting of: a cylinder chamber having an end face; an inlet hole in the end face having a center axis in off-center relation to the cylinder chamber; a non-helical inlet valve positioned in the inlet hole and having a valve stem having a peripheral surface; an inlet passage comprising a swirl generating section which has a ceiling and is connected to the inlet hole and surrounds the inlet valve at an end section thereof and an introducing section having a center line and comprising the remaining portion of the inlet passage; a first distance between the peripheral surface of the valve stem of the inlet valve and the wall surface of the swirl generating section as measured in a plane perpendicular to the center line of the introducing section and a plane parallel to the inlet hole and the outside part on the wall side of the cylinder chamber being larger than a second distance measured in the same planes at the inside part on the center side of the cylinder chamber; the introducing section being connected to the outside part of the swirl generating section; wherein the ratio of the first distance to the second distance is not less than 1.1 or more than 2.8; wherein the height from the inlet hole to the ceiling of the swirl generating section is greatest at the wider outside part and progressively decreases from the wider outside part to the narrower inside part around the valve stem; and wherein the average rate of reduction of the height is not less than 0% and not more than 0.18% of the inlet hole diameter for each degree around the valve stem.
- Assignee:
- Kabushiki Kaisha Toyota Chuo Kenkyusho
- Patent Number(s):
- US 4574751
- OSTI ID:
- 5688231
- Country of Publication:
- United States
- Language:
- English
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