Ceramic-to-metal shaft assembly
First Claim
1. A shaft assembly, comprising:
- a ceramic shaft;
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 and securing the ceramic shaft to the metallic shaft.
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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;
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 and 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;
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 and securing the ceramic shaft to the metallic shaft. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification