Piston providing for reduced heat loss using cooling media
First Claim
1. A piston for an internal combustion engine, comprising:
- a body formed of a metal material;
said body including a crown presenting a combustion surface;
said crown including an outer side wall depending from said combustion surface, said outer side wall presenting an outer diameter of said body;
said crown including an outer cooling gallery and an undercrown cooling gallery;
said outer cooling gallery extending circumferentially along said outer side wall beneath said combustion surface, said outer cooling gallery being sealed and containing a first cooling media;
said undercrown cooling gallery being surrounded by said outer cooling gallery beneath a first undercrown surface, said undercrown cooling gallery containing a second cooling media; and
said crown including a lower wall extending along said undercrown cooling gallery, said lower wall including an inlet hole to said undercrown cooling gallery, and said inlet hole to said undercrown cooling gallery being tapered.
18 Assignments
0 Petitions
Accused Products
Abstract
A steel piston achieving increased thermal brake efficiency in an internal combustion engine is provided. The piston includes a crown presenting a combustion surface, an outer side wall depending from the combustion surface, an outer cooling gallery, and an undercrown cooling gallery. The outer cooling gallery extends circumferentially along the outer side wall beneath the combustion surface. According to one embodiment, the outer cooling gallery is sealed and filled with air, argon, helium, xenon, or carbon dioxide as a cooling media. In this embodiment, the undercrown cooling gallery is filled with air as a cooling media and includes an open inlet hole having a diameter being from 2% to 4% of an outer diameter of the piston. Alternatively, the undercrown cooling gallery is filled with air, argon, helium, xenon, or carbon dioxide as a cooling media, and the inlet hole is sealed.
74 Citations
22 Claims
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1. A piston for an internal combustion engine, comprising:
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a body formed of a metal material; said body including a crown presenting a combustion surface; said crown including an outer side wall depending from said combustion surface, said outer side wall presenting an outer diameter of said body; said crown including an outer cooling gallery and an undercrown cooling gallery; said outer cooling gallery extending circumferentially along said outer side wall beneath said combustion surface, said outer cooling gallery being sealed and containing a first cooling media; said undercrown cooling gallery being surrounded by said outer cooling gallery beneath a first undercrown surface, said undercrown cooling gallery containing a second cooling media; and said crown including a lower wall extending along said undercrown cooling gallery, said lower wall including an inlet hole to said undercrown cooling gallery, and said inlet hole to said undercrown cooling gallery being tapered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing a piston for an internal combustion engine, comprising the steps:
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providing a body formed of a metal material, the body including a crown presenting a combustion surface, the crown including an outer side wall depending from the combustion surface, the outer side wall presenting an outer diameter of the body, the crown including an outer cooling gallery being sealed and an undercrown cooling gallery, the outer cooling gallery extending circumferentially along the outer side wall beneath the combustion surface, the undercrown cooling gallery being surrounded by the outer cooling gallery beneath a first undercrown surface, the crown including a lower wall extending along the undercrown cooling gallery, the lower wall including an inlet hole to the undercrown cooling gallery being tapered; and providing a first cooling media in the outer cooling gallery and a second cooling media in the undercrown cooling gallery. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification