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US 11,959,436 B2Granted
Piston including spiral features to increase in-cylinder swirl
AssigneeTenneco Inc.
InventorsNorbert Schneider, Michael Weinenger, Thomas Harris
Life of this patent
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Abstract
A piston for an internal combustion engine which includes a crown having spiral features designed to increase swirl of combustion gases in a cylinder of the engine is provided. The spiral features can be located in a combustion surface or in a combustion bowl of the crown. The increased swirl of the combustion gases is expected to improve mixing of the air and fuel injected into the cylinder, and thus cause the fuel to burn more completely, achieve better efficiency out of the injected fuel, and reduce unburned hydrocarbons in the exhaust gas.
Claims15
A piston, comprising:
- a crown extending longitudinally along a center axis and an outer rim extending circumferentially around the center axis,
- the crown including a combustion surface extending radially from the outer rim toward the center axis,
- the crown including a combustion bowl extending radially from the combustion surface toward the center axis,
- the combustion surface including spiral features disposed around the center axis,
- each spiral feature having a first wall extending at an angle of 10 to 45° relative to the outer rim,
- each spiral feature having a second wall extending from the first wall to a first wall of an adjacent spiral feature,
- the second wall extending at an angle of 15 to 60° relative to the outer rim,
- first wall and the second wall presenting an apex therebetween,
- each spiral feature having an outer wall extending from the bowl rim toward the center axis and the apex,
- each spiral feature having an inner wall extending from the combustion bowl away from the center axis and toward the apex,
- the combustion bowl including a concave surface disposed radially inward of the spiral features between the spiral features and the center axis, and
- wherein the concave surface is not radially aligned with the spiral features or radially outward of the spiral features.
9 more elements
Dependencies are inferred from the claim text.