An internal combustion engine includes a combustion chamber having a piston, the piston having at least one arcuate indent of a first type formed in the top surface, and at least one arcuate indent of a second type, wherein the first type includes a first recirculation surface having a concave shape
An internal combustion engine includes a combustion chamber having a piston, the piston having at least one arcuate indent of a first type formed in the top surface, and at least one arcuate indent of a second type, wherein the first type includes a first recirculation surface having a concave shape at a first radius and extending along a spiral direction adjacent the entry surface, and wherein the second type includes a second recirculation surface having a concave shape at a second radius that is smaller than the first radius. During operation, a fuel jet provided into the first type occupies a radially outward portion of the combustion chamber, and a fuel jet provided into the second type occupies a central portion of the combustion chamber.
대표청구항▼
1. An internal combustion engine, comprising: an engine block having at least one cylinder bore;a cylinder head having a flame deck surface disposed at one end of the cylinder bore;a piston connected to a rotatable crankshaft and configured to reciprocate within the cylinder bore, the piston having
1. An internal combustion engine, comprising: an engine block having at least one cylinder bore;a cylinder head having a flame deck surface disposed at one end of the cylinder bore;a piston connected to a rotatable crankshaft and configured to reciprocate within the cylinder bore, the piston having a crown portion facing the flame deck surface such that a combustion chamber is defined within the cylinder bore and between a top surface of the crown portion and the flame deck surface;a fuel injector having a nozzle tip disposed in fluid communication with the combustion chamber, the nozzle tip having at least one nozzle opening configured to inject a fuel jet into the combustion chamber and along a fuel jet centerline;at least one arcuate indent of a first type formed in the top surface, the at least one arcuate indent of the first type being aligned with the fuel jet centerline and including a first entry surface extending from a central portion of the piston, a first recirculation surface having a concave shape at a first radius and extending along a spiral direction adjacent the entry surface, and a wall extending generally in an axial direction and disposed radially along the first recirculation surface;at least one arcuate indent of a second type formed in the top surface and adjacent the at least one arcuate indent of the first type, the at least one arcuate indent of the second type being aligned with a second fuel jet centerline and including a second entry surface extending from a central portion of the piston, a second recirculation surface having a concave shape at a second radius that is smaller than the first radius, the second recirculation surface extending along a plane that is perpendicular to the top surface and intersecting a diameter of the top surface, and a wall extending generally in an axial direction and disposed radially along the second recirculation surface;wherein, during operation, a fuel jet provided into the at least one arcuate indent of the first type is arranged to occupy a first region disposed in a radially outward portion of the combustion chamber, andwherein, during operation, a fuel jet provided into the at least one arcuate indent of the second type is arranged to occupy a second region disposed in a central portion of the combustion chamber. 2. The internal combustion engine of claim 1, wherein the top surface has a generally circular shape that is defined within a circular periphery and has a generally flat shape that extends along a single plane that is nominally disposed in perpendicular relation to a centerline axis of the cylinder bore. 3. The internal combustion engine of claim 2, wherein the piston forms a plurality of arcuate indents of the first type. 4. The internal combustion engine of claim 3, wherein the piston forms a plurality of arcuate indents of the second type. 5. The internal combustion engine of claim 4, wherein each of the pluralities of arcuate indents of the first and second types are arranged in alternating fashion around a central point of the crown portion and in aligned relation to each of a plurality of nozzle openings in the nozzle tip. 6. The internal combustion engine of claim 1, wherein the first entry surface is flat. 7. The internal combustion engine of claim 5, wherein the first entry surface lies along an angled plane that is disposed at an acute angle relative to the plane of the top surface. 8. The internal combustion engine of claim 7, wherein the first entry surface has a generally triangular shape with curved edges that includes a central point disposed adjacent a piston surface center, and wherein the entry surface extends away from the piston surface center in a radial direction along the angled plane. 9. The internal combustion engine of claim 8, wherein, opposite a central point of the top surface, the first entry surface has a generally curved edge that is sickle-shaped, which forms a transition between the first entry surface and first the recirculation surface. 10. The internal combustion engine of claim 1, wherein the second entry surface is flat. 11. The internal combustion engine of claim 10, wherein the second entry surface lies along an angled plane that is disposed at an acute angle relative to the plane of the top surface. 12. The internal combustion engine of claim 11, wherein the second entry surface has a tear-drop shape with curved edges that includes a central point disposed adjacent a piston surface center, and wherein the second entry surface extends away from the piston surface center in a radial direction along the angled plane. 13. The internal combustion engine of claim 12, wherein, opposite a central point of the top surface, the second entry surface has a generally curved edge that forms a transition between the second entry surface and the second recirculation surface. 14. The internal combustion engine of claim 1, wherein the first recirculation surface has a concave shape that sweeps in a spiral direction radially outwardly from a center portion of the piston along a curved edge of the first entry surface. 15. The internal combustion engine of claim 1, wherein the second recirculation surface has a concave shape that sweeps in a radial direction away from a center portion of the piston. 16. The internal combustion engine of claim 1, wherein the walls of the at least one arcuate indent of the first and second types has a variable height that is minimum along a radially inward end of the wall. 17. The internal combustion engine of claim 16, wherein the wall presents a top edge having a generally curved shape and a bottom edge that follows the first or second recirculation surface, respectively. 18. The internal combustion engine of claim 1, wherein at an interface or rim of the at least one arcuate indent of the first type or the at least one arcuate indent of the second type with respect to the top surface is disposed a convex transition. 19. The internal combustion engine of claim 1, further comprising a recessed upper edge that creates an empty space around a top, outer periphery of the piston, which opens up space above a region along an outer peripheral cylindrical surface of the piston that is disposed above an upper seal ring of the piston and occupies a cylindrical space between the piston and an inner surface of the cylinder bore. 20. The internal combustion engine of claim 19, further comprising a frusto-conical surface extending at an acute angle between a top edge of the outer peripheral cylindrical surface of the crown portion and an outer periphery of the top surface.
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이 특허에 인용된 특허 (13)
Kanai Seikichi (Oyama JPX) Komiyama Kunihiko (Oyama JPX), Combustion chamber for an internal combustion engine of direct injection type.
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