Dual zone combustion chamber
View Patent ↗A combustion chamber and method of distributing fuel in a combustion chamber is disclosed. The combustion chamber includes a first section that is generally centrally positioned in the combustion chamber. A second section is offset from the first section and maintains a uniform distance between a fuel spray and a perimeter of the second section. Such a combustion chamber improves combustion by maintaining a generally uniform fuel spray spacing to the combustion chamber walls.
1. A combustion chamber for a two-cycle engine comprising:
a first zone formed above a cylinder bore having an axis of symmetry generally aligned with the cylinder bore;
a second zone having an axis of symmetry generally aligned with a fuel spray projection from a fuel injector;
an opening formed in the second zone and configured to receive a spark plug having a tip intersecting the fuel spray projection; and
wherein the axis of symmetry of the second zone is skewed and offset from the axis of symmetry of the first zone.
2. The combustion chamber of claim 1 wherein a cross-section of the first zone has a generally triangular shape.
3. The combustion chamber of claim 2 wherein two ends of the generally triangular shape intersect a squish zone of the combustion chamber.
4. The combustion chamber of claim 1 wherein a portion of the second zone intersects a squish zone of the combustion chamber.
5. The combustion chamber of claim 1 wherein the first zone has a cross-section that is generally trapezoidal.
6. The combustion chamber of claim 5 wherein the first zone isolates the second zone from contact with a squish zone of the combustion chamber.
7. The combustion chamber of claim 1 wherein the second zone has a cross-sectional shape that substantially follows a cross-sectional shape of the fuel spray.
8. The combustion chamber of claim 1 wherein the fuel spray pattern is equidistant from each side wall of the second zone.
9. The combustion chamber of claim 1 incorporated into an internal combustion engine of a recreational product.
10. An engine comprising:
a block having at least one piston reciprocally disposed in a cylinder;
a cylinder head attached to the block over the at least one piston and cylinder;
the cylinder head having a combustion chamber aligned with the cylinder defining a squish zone between the piston and cylinder head, the combustion chamber having:
a lower portion having a cross-sectional shape that is asymmetric about a central axis of the cylinder; and
an upper portion positioned generally coaxially about a fuel spray pattern and having a first side configured to receive a spark plug therein and a second side in contact with the lower portion.
11. The engine of claim 10 wherein an intersection of the upper portion and the lower portion forms a circular shape.
12. The engine of claim 10 wherein a portion of the upper portion contacts the squish zone.
13. The engine of claim 12 wherein the lower portion has a generally triangular cross-section.
14. The engine of claim 10 wherein the lower portion separates the upper portion from the squish zone.
15. The engine of claim 13 wherein the generally triangular cross-section of the lower portion has one side that is in contact with the squish zone.
16. The engine of claim 14 wherein the lower portion has a trapezoidal cross-section.
17. The engine of claim 10 wherein a perimeter of the piston is concentric about a perimeter of the lower portion.
18. The engine of claim 10 wherein a portion of the fuel spray pattern extends through the lower portion before passing a perimeter of the lower portion.
19. The engine of claim 10 further comprising a spark plug opening extending into the upper portion to receive a spark plug therein having a tip that intersects the fuel spray pattern.
20. The engine of claim 10 further comprising a fuel injector in fluid communication with the combustion chamber.
21. The engine of claim 10 incorporated into at least one of a snowmobile, a lawn/garden equipment, an ATV, a moped, and an outboard motor.