Ducted Combustion Systems Utilizing Duct Structures
US-2016298529-A1 · Oct 13, 2016 · US
Piston with reduced top land height and tight top land piston profile
US9932930B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9932930-B2 |
| Application number | US-201414154462-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 14, 2014 |
| Priority date | Jan 14, 2014 |
| Publication date | Apr 3, 2018 |
| Grant date | Apr 3, 2018 |
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Abstract
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An assembly includes a cylinder having a bore diameter, and a piston disposed within the cylinder. The piston is provided with a top land and a top ring groove. The top land and the cylinder are provided with a tight top land clearance. The ratio of the top land height to the bore diameter is less than or equal to 0.075.
First claim
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What is claimed: 1. An assembly for use in an internal combustion engine comprising: a cylinder having a bore diameter; a piston disposed within the cylinder, the piston having a top land with a top land height, wherein the top land of the piston is made of aluminum the top land and the cylinder having a tight top land clearance between an aluminum surface of the top land interfacing with an inner surface of the cylinder; wherein the ratio of the top land height to the bore diameter is less than or equal to 0.025; and wherein the tight top land clearance is less than 25 microns at rated temperatures when the internal combustion engine operates at rated temperatures. 2. The assembly of claim 1 , wherein the tight top land clearance is between 0 microns and 35 microns when the internal combustion engine operates at rated temperatures. 3. The assembly of claim 1 , wherein the tight top land clearance is less than 0.46% of the bore diameter at room temperature for a lean burn engine and less than 0.53% of the bore diameter for a stoichiometric burn engine. 4. A piston for use with an internal combustion engine having a cylinder with a bore diameter, the piston comprising: a top land made of metal and having a top land height and a tight top land clearance between a metal surface of the top land interfacing with an inner surface of the cylinder; and wherein the ratio of the top land height to the bore diameter is less than or equal to 0.025, and the tight top land clearance is less than 25 microns at rated temperatures when the internal combustion engine operates at rated temperatures. 5. The piston of claim 4 , wherein the top land of the piston is made of aluminum and the tight top land clearance is less than 0.46% of the bore diameter at room temperature for a lean burn engine, and less than 0.53% of the bore diameter at room temperature for a stoichiometric burn engine. 6. The piston of claim 4 , wherein top land of the piston is made of steel and the tight top land clearance is less than 0.29% of the bore diameter at room temperature for a lean burn engine, and less than 0.33% of the bore diameter at room temperature for a stoichiometric burn engine. 7. An internal combustion engine comprising: a cylinder having a bore diameter; a piston disposed in the cylinder, the piston having a top land with a top land height, wherein the top land of the piston is made of aluminum; the top land and the cylinder having a tight top land clearance between an aluminum surface of the top land interfacing with an inner surface of the cylinder; and wherein the ratio of the top land height to the bore diameter is less than or equal to 0.075, and the tight top land clearance is less than 25 microns at rated temperatures when the internal combustion engine operates at rated temperatures. 8. The internal combustion engine of claim 7 , wherein the tight top land clearance is less than 0.46% of the bore diameter at room temperature for a lean burn engine and the tight top land clearance is less than 0.53% of the bore diameter at room temperature for a stoichiometric burn engine. 9. The internal combustion engine of claim 7 , wherein the ratio of the top land height to the bore diameter is less than or equal to 0.025.
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Frequently asked questions
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- What does patent US9932930B2 cover?
- An assembly includes a cylinder having a bore diameter, and a piston disposed within the cylinder. The piston is provided with a top land and a top ring groove. The top land and the cylinder are provided with a tight top land clearance. The ratio of the top land height to the bore diameter is less than or equal to 0.075.
- Who is the assignee on this patent?
- Gen Electric
- What technology area does this patent fall under?
- Primary CPC classification F02F3/28. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Apr 03 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).