Engine and high turbulence piston therefor
AssigneeGeneral Motors Corporation
InventorsRamachandra Diwakar, Roger B. Krieger, Keith Meintjes, Edward G. Groff
Life of this patent
Estimating the term…
Abstract
A direct injection internal combustion engine of the diesel or spark ignition type is provided with a combustion bowl recess in the head end of the piston having both a polygonal lip and a polygonal bowl with upwardly and inwardly curving reentrant sides to provide high turbulence for fuel air mixing during an extended portion of the piston compression stroke and improved combustion of the air/fuel mixture.
Claims9
An internal combustion engine comprising
- a cylinder closed at one end,
- a piston reciprocable in the cylinder and having a head end opposing the cylinder closed end, the piston defining with the cylinder a variable volume working chamber, said piston having a reentrant polygon shaped combustion chamber bowl having a bottom with an outer portion that joins with essentially U-shaped side walls smoothly and exclusively connecting the bottom of the polygonal bowl with a polygonal lip located in the head end and defining an opening toward the cylinder closed end, and
- direct fuel injection means mounted in the cylinder closed end opposite the combustion chamber bowl and adapted to direct a fuel spray into the open combustion chamber.
An internal combustion engine comprising
- a cylinder closed at one end,
- a piston reciprocable in the cylinder and having a head end opposing the cylinder closed end, said piston defining with the cylinder a variable volume working chamber, said piston having a combustion chamber defining recess in the head end and opening toward the cylinder closed end, and
- direct fuel injection means mounted in the cylinder closed end opposite the combustion chamber recess and adapted to direct a fuel spray into the open combustion chamber,
- wherein the combustion chamber recess includes
- essentially U-shaped side walls smoothly and exclusively connecting
- a generally polygonal lip in the head end with
- a bottom portion of a generally polygonal bowl under the lip, the bowl being generally of greater lateral dimensions than the lip to thereby provide a reentrant combustion chamber recess with polygonal bowl and lip.
An engine piston having a reentrant combustion chamber recess with essentially U-shaped side walls smoothly and exclusively connecting a bottom portion of a polygonal bowl with a polygonal lip opening to the piston exterior.
Dependencies are inferred from the claim text.