DISSIMILAR MATERIAL RETENTION
First Claim
1. A method of designing an interference fit assembly, the method comprising:
- designing a geometric layout of a first piece, a second piece, and a third piece, wherein said first piece is in contact with and encloses at least a portion of said second piece, and wherein said second piece is in contact with and encloses at least a portion of said third piece;
selecting, for said first piece, a first material with a known CTE;
selecting, for said second piece, a second material with an equal or higher CTE than said first material; and
selecting said first and second material such that the material properties are not exceeded during operation over an operational temperature range.
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Accused Products
Abstract
In accordance with various aspects of the present invention, methods and apparatuses for designing and configuring dissimilar material retention, specifically a valve plug assembly, are disclosed. The methods and apparatuses enable the application of a wider range of materials in a valve plug assembly than previous valve plug assemblies, and also increase the operational temperature range of the valve plug assembly. In an exemplary embodiment, a valve plug assembly comprises a plug head, a collet surrounding the plug head, a plug base adjacent to the collet, and a retainer surrounding the tapered outside surface of the collet and the plug base, where the plug head extends past the collet and the retainer. The valve plug assembly is configured to create an interference fit of the various components.
23 Citations
20 Claims
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1. A method of designing an interference fit assembly, the method comprising:
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designing a geometric layout of a first piece, a second piece, and a third piece, wherein said first piece is in contact with and encloses at least a portion of said second piece, and wherein said second piece is in contact with and encloses at least a portion of said third piece; selecting, for said first piece, a first material with a known CTE; selecting, for said second piece, a second material with an equal or higher CTE than said first material; and selecting said first and second material such that the material properties are not exceeded during operation over an operational temperature range. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An assembly comprising:
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a first component comprising a first material with a first CTE; and a second component comprising a second material with a second CTE, wherein the second CTE is equal to or greater than the first CTE; wherein a first component is in contact with and encloses at least a portion of said second component, and wherein said second component is in contact with and encloses at least a portion of a third component; wherein said first component, said second component, and said third component are assembled using an interference fitting. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A valve plug assembly comprising:
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a plug head; a collet surrounding said plug head, further comprising a tapered outside surface, a bottom surface, and a length; a plug base adjacent to the bottom surface of said collet, and further comprising a length; and a collet retainer surrounding the tapered outside surface of said collet and said plug base, wherein said plug head extends past said collet and said collet retainer; wherein said valve plug assembly is configured to create an interference fit. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification