Diesel engine intake port
AssigneeNissan Motor Co., Ltd.
InventorJunichi Kawashima
Life of this patent
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Abstract
An intake port of a diesel engine comprises a straight part, a winding part and a cylindrical part. A connecting port connecting the winding part with the cylindrical part is formed at a height H from the roof of the combustion chamber. H=Rt.multidot..alpha..multidot.tan .theta., where Rt=radius of cylindrical part, .alpha.=angle subtended by the flowrate gravity center position and optimum inflow position of the connecting port at the center of the cylindrical part, .theta.=aspirated air descending angle in winding part. Due to this height setting, both swirl intensification and volume efficiency improvement are achieved.
Claims3
A helical intake port through which air flows into a combustion chamber of a diesel engine, comprising:
- a cylindrical part having an opening at an upper end of said combustion chamber,
- a winding part having a spiral shape connected to said cylindrical part via a connecting part formed in an upper end of said cylindrical part, and
- a straight part connected to an upstream end of said winding part for guiding air to said winding part in a linear stream,
- wherein a height H from said opening to said connecting part is defined by the following equation:
- H=Rt.multidot..alpha..multidot.tan .theta.
- where,
- Rt=radius of cylindrical part,
- .alpha.=angle subtended by flowrate gravity center position and optimum inflow position of connecting port at center of cylindrical part, and
- .theta.=descending angle of aspirated air in winding part.
Dependencies are inferred from the claim text.