Two-part stationary ring for devices having pistons
AssigneeEcoMotors, Inc.
InventorsPeter Hofbauer, Diana Brehob
Life of this patent
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Abstract
In some two-stroke engines, a stationary ring is disposed in a groove in the cylinder liner. However, it is a challenge to install such a stationary ring while maintaining a narrow gap to minimize gas flow through the gap. A ring system for an internal combustion engine is disclosed that includes an L-shaped, split ring with a reentrant angle and a nested, split ring with a convex quadrilateral cross section nested with the L-shaped ring proximate the reentrant angle. The two rings are affixed so that the two gaps of the split rings cannot align. Or, in other embodiments, the two are allowed to rotate relative to each other over a predetermined angle.
Claims18
A ring system for a device having a reciprocating piston, comprising:
- an L-shaped, split ring with a reentrant angle;
- a nested, split ring having a convex quadrilateral cross section nested with the L-shaped ring proximate the reentrant angle;
- and
- a feature associated with at least one of the L-shaped and nested rings that limits relative, rotational movement between the rings to less than a predetermined angle, wherein the L-shaped and nested rings are adapted to be installed into a groove in a cylinder wall of the device, and wherein the feature is one of a weld and braze joint and the predetermined angle is substantially zero.
A ring system for a device having a reciprocating piston, comprising:
- an L-shaped, split ring with a reentrant angle;
- a nested, split ring having a convex Quadrilateral cross section nested with the L-shaped ring proximate the reentrant angle;
- and
- a feature associated with at least one of the L-shaped and nested rings that limits relative, rotational movement between the rings to less than a predetermined angle, wherein the L-shaped and nested rings are adapted to be installed into a groove in a cylinder wall of the device, and wherein the feature includes
- a groove formed in a predetermined angle of the circumference of one of the L-shaped ring and the nested ring proximate the reentrant angle and a tab formed in the other of the L-shaped ring and the nested ring wherein the tab engages with the groove.
A piston-and-cylinder assembly, comprising:
- a cylinder wall having a circumferential groove formed therein;
- a piston disposed within the cylinder wall;
- an L-shaped, split ring with a reentrant angle disposed in the groove;
- and
- a nested, split ring with a convex quadrilateral cross section nested with the L-shaped ring proximate the reentrant angle, wherein the L-shaped and nested rings are affixed by one of pinning, welding, and brazing to prevent relative, rotational movement between the rings.
A method to install a ring system, comprising:
- nesting an L-shaped ring and a nested ring wherein:
- the L-shaped ring is a split ring with a reentrant angle;
- the nested ring has a convex quadrilateral cross section;
- and the L-shaped ring nests with the nested ring proximate the reentrant angle;
- compressing the L-shaped and nested rings;
- inserting the compressed rings into a cylinder liner;
- moving the compressed rings into a groove in the cylinder liner whereby the compressed rings attain a neutral position in the groove;
- and
- affixing the L-shaped ring and the nested ring by one of:
- pinning, brazing, and welding.
Dependencies are inferred from the claim text.