Scraper ring for a piston
AssigneeCaterpillar Inc.
InventorAdam Joseph CLUTE
Life of this patent
Estimating the term…
Abstract
A scraper ring for a piston includes a top surface, a bottom surface, an inner surface, and an outer surface. The top surface has a first planar portion and a first angled portion. The bottom surface has a second planar portion and a second angled portion. The second angled portion is configured to slidably contact the first angled portion to adjust a diameter of the scraper ring. The inner surface connects the top surface to the bottom surface. The outer surface is opposite to the top surface and is configured to form 360 degrees of contact with a wall of a cylinder to substantially limit an amount of oil entering a combustion chamber of the cylinder.
Claims20
A scraper ring for a piston, comprising:
- an arcuate body comprising an inner surface, an outer surface, a first end surface connecting the inner surface to the outer surface, and a second end surface that is opposite to the first end surface,
- a first projection extending circumferentially from the first end surface,
- wherein the first projection comprises a first inner surface, a first outer surface, and a first contact surface connecting the first inner surface to the first outer surface;
- and
- a second projection extending circumferentially from the second end surface,
- wherein the second projection comprises a second inner surface, a second outer surface, and a second contact surface connecting the second inner surface to the second outer surface;
- wherein the first contact surface is configured to slidably contact the second contact surface to adjust a diameter of the scraper ring;
- and
- wherein, when the first contact surface contacts the second contact surface,
- the inner surface, the first inner surface, and the second inner surface together define an interior surface of the scraper ring that extends 360 degrees relative to a central axis of the scraper ring, and
- the outer surface, the first outer surface, and the second outer surface together define an exterior surface of the scraper ring that extends 360 degrees relative to the central axis;
- and
- wherein at least one of the first projection or the second end surface includes a groove to permit fluid to pass from the interior surface of the scraper ring to the exterior surface of the scraper ring.
A scraper ring for a piston, comprising:
- a top surface having a first planar portion and a first angled portion;
- a bottom surface having a second planar portion and a second angled portion,
- wherein the second angled portion is configured to slidably contact the first angled portion to adjust a diameter of the scraper ring;
- an inner surface connecting the top surface to the bottom surface;
- and
- an outer surface that is opposite to the top surface,
- wherein the outer surface is configured to form 360 degrees of contact with a wall of a cylinder to substantially limit an amount of oil entering a combustion chamber of the cylinder.
A scraper ring, comprising:
- an outer surface that is configured to form 360 degrees of contact with a wall of a cylinder in order to substantially limit oil from passing between the scraper ring and the wall to enter a combustion chamber of the cylinder;
- and
- a bottom surface that is configured to form less than 360 degrees of contact with a land of a piston to permit gas to vent between the scraper ring and the land.
Dependencies are inferred from the claim text.