Ceramic-to-metal shaft assembly
First Claim
1. A shaft assembly, comprising:
- a ceramic shaft comprising a ceramic material;
a metallic shaft, one of the ceramic shaft or the metallic shaft having a generally conical portion near one end and the other of the shafts having a generally conical recess that at least partially receives the generally conical portion, the generally conical recess having a first portion that is received directly against a corresponding section of the generally conical portion, the generally conical recess having a second portion that is spaced in a radial direction a selected distance from a corresponding section of the generally conical portion, the second portion having a length extending in an axial direction that is more than twice as long as the selected distance; and
a braze alloy in the second portion, the braze alloy directly contacting only the ceramic material of the ceramic shaft and the metal shaft for securing the ceramic shaft to the metallic shaft.
1 Assignment
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Accused Products
Abstract
A shaft assembly includes a metallic portion and a ceramic portion. In a disclosed example, a ceramic shaft has a generally conical end that is at least partially received within a generally conical recess in one end of a metallic shaft. The recess has a first portion that has an inner surface that is received directly against a corresponding outer surface on a section of the ceramic shaft conical portion. A second portion of the recess is radially spaced from the ceramic shaft and provides a controlled gap within which a braze alloy is maintained. In one example, the second portion has an axial length that is more than twice a radial depth of the second portion. In another example, a transition surface between the first and second portions of the recess has a linear profile.
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Citations
21 Claims
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1. A shaft assembly, comprising:
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a ceramic shaft comprising a ceramic material; a metallic shaft, one of the ceramic shaft or the metallic shaft having a generally conical portion near one end and the other of the shafts having a generally conical recess that at least partially receives the generally conical portion, the generally conical recess having a first portion that is received directly against a corresponding section of the generally conical portion, the generally conical recess having a second portion that is spaced in a radial direction a selected distance from a corresponding section of the generally conical portion, the second portion having a length extending in an axial direction that is more than twice as long as the selected distance; and a braze alloy in the second portion, the braze alloy directly contacting only the ceramic material of the ceramic shaft and the metal shaft for securing the ceramic shaft to the metallic shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A shaft assembly, comprising:
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a ceramic shaft comprising a ceramic material; a metallic shaft, one of the ceramic shaft or the metallic shaft having a generally conical portion near one end and the other shaft having a generally conical recess that at least partially receives the generally conical portion, the generally conical recess having a first portion that is received directly against a corresponding section of the generally conical portion, the generally conical recess having a second portion that is spaced in a radial direction a selected distance from a corresponding section of the generally conical portion, a transition surface between the first and second portions having a linear profile; and a braze alloy in the second portion, the braze alloy directly contacting only the ceramic material of the ceramic shaft and the metal shaft for securing the ceramic shaft to the metallic shaft. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification