IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0318499
(2002-12-13)
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발명자
/ 주소 |
|
출원인 / 주소 |
- International Engine Intellectual Property Company, LLC
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
23 |
초록
▼
A combustion chamber assembly for use in a piston of a diesel engine includes a combustion chamber defined intersecting a crown of the piston, the combustion chamber being defined by three curved surfaces, adjacent surfaces having direct smooth junctures.A piston and a method of forming a combustion
A combustion chamber assembly for use in a piston of a diesel engine includes a combustion chamber defined intersecting a crown of the piston, the combustion chamber being defined by three curved surfaces, adjacent surfaces having direct smooth junctures.A piston and a method of forming a combustion chamber are further included.
대표청구항
▼
1. A combustion chamber assembly for use in a piston of a diesel engine, comprising:a combustion chamber being defined intersecting a crown of the piston, the combustion chamber being defined by three curved surfaces of revolution only, adjacent curved surfaces having direct smooth junctures requiri
1. A combustion chamber assembly for use in a piston of a diesel engine, comprising:a combustion chamber being defined intersecting a crown of the piston, the combustion chamber being defined by three curved surfaces of revolution only, adjacent curved surfaces having direct smooth junctures requiring no additional surfaces to effect the junctures, a combustion chamber first curved surface being a center portion, the center portion being defined at least in part by a surface being a portion of a convex sphere to define a post, the post being an upward extending generally central bottom portion of the combustion chamber, the sphere having a radius and an origin; a combustion chamber second curved surface defining at least in part combustion chamber bottom and side margins and being defined at least in part by an annular surface, the annular surface being concave and having an origin and a radius and being joined to the post; and a combustion chamber third curved surface being defined by an origin and a radius and being smoothly joined to the second curved surface and intersecting the crown of the piston. 2. The combustion chamber assembly of claim 1 wherein the origin of the post is disposed on the center axis of the combustion chamber, the center axis of the combustion chamber being coaxial with the center axis of the piston.3. The combustion chamber assembly of claim 2 wherein a juncture between adjacent surfaces requires no additional surfaces to effect a smooth transition.4. The combustion chamber assembly of claim 2 wherein the combustion chamber is symmetrical about a combustion chamber axis.5. The combustion chamber assembly of claim 1 wherein the ratio of a radius of a center portion convex spherical surface, RS1, of the combustion chamber to a maximum bowl diameter, D2, is greater than 0.11 and less than 0.44.6. The combustion chamber assembly of claim 5 wherein the ratio of the radius of the center portion convex spherical surface, RS1, of the combustion chamber to the maximum bowl diameter, D2, is substantially 0.298.7. The combustion chamber assembly of claim 1 wherein the ratio of a combustion chamber bowl diameter D2 to a piston diameter D1 is greater than 0.44 and less than 0.88.8. The combustion chamber assembly of claim 8 wherein the ratio of the combustion chamber bowl diameter D2 to the piston diameter D1 is preferably substantially 0.583.9. The combustion chamber assembly of claim 2 wherein the ratio of a diameter of the bowl lip D3 to a maximum bowl diameter D2 is greater than 0.33 and less than 0.99.10. The combustion chamber assembly of claim 9 wherein the ratio of the diameter of the bowl lip D3 to the maximum bowl diameter D2 is substantially 0.874.11. The combustion chamber assembly of claim 1 wherein the ratio of a annular surface R1 to a maximum diameter of the bowl D2 is between 0.05 and 0.33.12. The combustion chamber assembly of claim 11 wherein the ratio of the annular surface R1 to the maximum diameter of the bowl D2 is substantially 0.134.13. The combustion chamber assembly of claim 1 wherein the ratio of a annular surface R2 to a maximum diameter of the bowl D2 is between 0.01 and 0.11.14. The combustion chamber assembly of claim 13 wherein the ratio of the annular surface R2 to the maximum diameter of the bowl D2 is substantially 0.045.15. The combustion chamber assembly of claim 1 wherein the ratio of a bowl lip diameter H1 to a maximum bowl diameter D2 is between 0.22 and 0.55.16. The combustion chamber assembly of claim 15 wherein the ratio of the bowl lip diameter H1 to the maximum bowl diameter D2 is preferably substantially 0.316.17. The combustion chamber assembly of claim 1 wherein a ratio of the height of the bowl H2 to a maximum bowl diameter D2 is between 0.11 and 0.44.18. The combustion chamber assembly of claim 17 wherein the ratio of the bowl post height H2 to the maximum bowl diameter D2 is preferably substantially 0.202.19. The combustion chamber assembly of claim 1 the combustion chamber having a central axis, the combustion chamber central axis being coincident with a piston central axis.20. The combustion chamber assembly of claim 1 being formed free of flat surfaces.21. A piston of a diesel engine having a combustion chamber assembly, comprising:a combustion chamber being defined intersecting a crown of the piston, the combustion chamber being defined by three curved surfaces of revolution only, adjacent curved surfaces having direct smooth junctions requiring no additional surfaces to effect the junctures, a combustion chamber first curved surface being a center portion, the center portion being defined at least in part by a surface being a portion of a convex sphere to define a post, the post being an upward extending generally central bottom portion of the combustion chamber, the sphere having a radius and an origin; a combustion chamber second curved surface being defining at least in part a combustion chamber bottom and side margins and being defined at least in part by an annular surface, the annular surface being concave and having an origin and a radius and being joined to the post; and a combustion chamber third curved surface having a radius and further being defined by an annular bowl lip surface joined to the second curved surface and intersecting the crown of the piston. 22. The piston of claim 21 wherein the origin of the post is disposed on the combustion chamber center axis, the center axis of the combustion chamber being coaxial with the center axis of the piston.23. The piston of claim 21 wherein the juncture between adjacent surfaces requires no additional surfaces to effect a smooth transition.24. The piston of claim 21 wherein the combustion chamber is symmetrical about a combustion chamber axis.25. The piston of claim 21 wherein the ratio of a radius of the center portion convex spherical surface, RS1, of the combustion chamber to a maximum bowl diameter, D2, is greater than 0.11 and less than 0.44.26. The piston of claim 25 wherein the ratio of the radius of the center portion convex spherical surface, RS1, of the combustion chamber to the maximum bowl diameter, D2, is substantially 0.298.27. The piston of claim 21 wherein a ratio of the combustion chamber bowl diameter D2 to a piston diameter D1 is greater than 0.44 and less than 0.88.28. The piston of claim 27 wherein the ratio of the combustion chamber bowl diameter D2 to the piston diameter D1 is preferably substantially 0.583.29. The piston of claim 21 wherein a ratio of the diameter of the bowl lip D3 to a maximum bowl diameter D2 is greater than 0.33 and less than 0.99.30. The piston of claim 29 wherein the ratio of the diameter of the bowl lip D3 to the piston diameter D1 is substantially 0.874.31. The piston of claim 21 wherein the ratio of a annular surface R1 to a maximum diameter of the bowl D2 is between 0.05 and 0.33.32. The piston of claim 31 wherein the ratio of the annular surface R1 to the maximum diameter of the bowl D2 is substantially 0.134.33. The piston of claim 21 wherein a ratio of the annular surface R2 to a maximum diameter of the bowl D2 is between 0.01 and 0.11.34. The piston of claim 33 wherein the ratio of the annular surface R2 to the maximum diameter of the bowl D2 is substantially 0.045.35. The piston of claim 23 wherein a ratio of the bowl lip H1 to a maximum bowl diameter D2 is between 0.22 and 0.55.36. The piston of claim 35 wherein the ratio of the bowl lip H1 to the maximum bowl diameter D2 is preferably substantially 0.316.37. The piston of claim 21 wherein a ratio of the height of the bowl H2 to a maximum bowl diameter D2 is between 0.11 and 0.44.38. The piston of claim 37 wherein the ratio of the bowl post height H2 to the maximum bowl diameter D2 is preferably substantially 0.202.39. The piston of claim 21 the combustion chamber having a central axis, the combustion chamber central axis being coincident with a piston central axis.40. The piston of claim 21 being formed free of flat surfaces.41. A method of forming a combustion chamber for use in a piston of a diesel engine, comprising:defining a combustion chamber bowl intersecting a crown of the piston, defining a piston central axis; forming the combustion chamber by three curved surfaces of revolution only; smoothly forming junctures joining adjacent curved surfaces directly to one another without any additional surfaces to effect the junctures; defining a combustion chamber elevated center post at least in part by a portion of a convex sphere, the sphere having a radius and an origin, defining a combustion chamber bottom and side in part by a first annular surface, the first annular surface having a radius and smoothly joining the annular surface to the post; and defining a smooth reentrant transition to the crown of the piston by a second annular surface having a radius, the second annular surface being smoothly joined to the first annular surface. 42. The method of claim 41 including defining smooth surface junctures between adjacent curved surfaces, without introducing any additional bowl surfaces.43. The method of claim 41 including defining the combustion chamber by a spherical surface and two annular surfaces.44. The method of claim 41 including disposing the origin of the center post on the piston central axis.45. The method of claim 41 including forming the combustion chamber free of flat surfaces.46. The method of claim 41 including disposing a combustion chamber central axis coincident with the piston central axis.
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