Abstract: A piston comprises a crown portion with a contoured bowl having a reentrant surface extending from the top squish surface that connects to a lower sidewall surface that connects to a swirl pocket surface disposed adjacent the bottom bowl surface.

Abstract: A piston comprises a crown portion with a contoured bowl having a reentrant surface extending from the top squish surface that connects to a lower sidewall surface that connects to a swirl pocket surface disposed adjacent the bottom bowl surface.

Abstract: A piston is disclosed. The piston may have a piston crown having a top surface. The piston may also have a first land disposed in the piston crown adjacent the top surface. The first land may have a side surface disposed generally orthogonal to the top surface. Further the piston may have a second land axially separated from the first land. In addition, the piston may have a groove disposed between the first land and the second land. The piston may also have a notch extending between the side surface and the top surface. The notch may have a generally concave shape and may extend circumferentially around the top surface.

Abstract: A piston is disclosed. The piston may have a piston crown having a top surface. The piston may also have a first land disposed in the piston crown adjacent the top surface. The first land may have a side surface disposed generally orthogonal to the top surface. Further the piston may have a second land axially separated from the first land. In addition, the piston may have a groove disposed between the first land and the second land. The piston may also have a notch extending between the side surface and the top surface. The notch may have a generally concave shape and may extend circumferentially around the top surface.

Abstract: A piston for an internal combustion engine is disclosed. The piston includes an upper surface configured to at least partly face a cylinder head of the internal combustion engine. The upper surface includes a combustion bowl surface, and a squish face having an internal edge disposed a first distance from the longitudinal axis along a radial direction. The combustion bowl surface includes a planar surface extending radially outward from the longitudinal axis of the piston, a first concave surface disposed outside the planar surface in the radial direction, the first concave surface having a first radius of curvature, and a second concave surface disposed outside the first concave surface in the radial direction, the second concave surface having a second radius of curvature, the second radius of curvature being smaller than the first radius of curvature.

Abstract: A piston for balancing combustion efficiency and smoke generation with NOx production includes a combustion face forming a combustion bowl having a compound curvature increased in sharpness in a radially outward direction. An outer bowl surface defines a large radius of curvature adjacent an inner bowl surface, and a medium radius of curvature adjacent a cylindrical wall surface. The inner bowl, outer bowl, and wall surfaces together contour the combustion bowl, such that a diameter of the combustion bowl is about 124 mm so as to establish a bowl to bore ratio of about 0.71 in a direct injection compression ignition engine with a compression ratio of about 15:1 to 17:1.

Abstract: A piston for an internal combustion engine is disclosed. The piston includes an upper surface configured to at least partly face a cylinder head of the internal combustion engine. The upper surface includes a combustion bowl surface, and a squish face having an internal edge disposed a first distance from the longitudinal axis along a radial direction. The combustion bowl surface includes a planar surface extending radially outward from the longitudinal axis of the piston, a first concave surface disposed outside the planar surface in the radial direction, the first concave surface having a first radius of curvature, and a second concave surface disposed outside the first concave surface in the radial direction, the second concave surface having a second radius of curvature, the second radius of curvature being smaller than the first radius of curvature.

Abstract: A piston for balancing combustion efficiency and smoke generation with NOx production includes a combustion face forming a combustion bowl having a compound curvature increased in sharpness in a radially outward direction. An outer bowl surface defines a large radius of curvature adjacent an inner bowl surface, and a medium radius of curvature adjacent a cylindrical wall surface. The inner bowl, outer bowl, and wall surfaces together contour the combustion bowl, such that a diameter of the combustion bowl is about 124 mm so as to establish a bowl to bore ratio of about 0.71 in a direct injection compression ignition engine with a compression ratio of about 15:1 to 17:1.