Joints and connections – Utilizing thermal characteristic – e.g. – expansion or... – Members having different coefficients of expansion
Patent
1993-04-14
1995-08-15
Bertsch, Richard A.
Joints and connections
Utilizing thermal characteristic, e.g., expansion or...
Members having different coefficients of expansion
403 41, 403335, 403337, B25G 300
Patent
active
054413583
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a coupling, in particular to a coupling between confronting faces of two coaxial co-rotatable components,the confronting faces being radial with respect to the axis of the component, and to a method of making such a coupling.
BACKGROUND OF THE INVENTION
Couplings are known which enable two coaxial components to rotate together. In one such coupling, one of the components is provided with a spigot which locates in a recess formed in the other component to which it is to be joined. The spigot cooperates with the recess producing an interference fit which maintains the two components in alignment so they rotate coaxially. A problem with such a coupling is that the spigot and recess have to be machined within fine tolerances to produce an interference fit and maintain the two components in alignment. The manufacturing process to produce a coupling within the required tolerances is both time consuming and expensive.
With a coupling of this type, alignment problems may arise between the two components if the spigot and recess experience differential expansion. This may be as a result of the two components having different coefficients of thermal expansion or if one of the components experiences a different temperature to the other component. The interference fit loosens and misalignment occurs resulting in eccentric rotation of the components. The eccentric rotation of the components may result in vibration between the radial faces and produce uneven wear on these faces.
SUMMARY OF THE INVENTION
The present invention seeks to provide an improved coupling between the radial confronting faces of two coaxial co-rotatatable components in which eccentric rotation is substantially eliminated.
According to the present invention a coupling between confronting faces of two coaxial co-rotatable components, said confronting faces being radial with respect to the axis of the components is characterized in that the at least one of the radial confronting faces is provided with a plurality of closely spaced apart scored lines which define ridges, the ridges having a large radial component and engaging with the other radial confronting face to prevent lateral movement of the components relative to one another.
Preferably the at least one radial confronting face which is provided with the ridges is of harder material than the other radial confronting face with which the ridges engage.
The radial confronting faces of the two coaxial co-rotating components may have different coefficients of thermal expansion and they may experience different temperatures when in operation.
The ridges on the at least one radial confronting face are preferably produced by radial grinding and have a height of the order of 3.2 .mu.m.
A method of joining confronting faces of two coaxial co-rotatable components, said confronting faces being radial with respect to the axis of the components comprises the steps of, machining a plurality of closely spaced apart scored lines to define ridges onto at least one of the radial confronting faces to be joined, urging the two radial confronting faces into abutting relationship so as to form an impression of the ridges in the other radial confronting face, characterized in that the plurality of ridges on each of the radial confronting faces have a large radial component and interengage so that lateral movement of the two components relative to one another is prevented.
The present invention will now be described by way of example and with reference to the accompanying drawings in which,
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a cross-sectional view of a coupling, in accordance with the present invention, between radial confronting face of two coaxial co-rotatable components.
FIG. 2 is a photograph of one of the radial confronting faces of a coupling in accordance with the present invention.
DETAILED DESCRIPTION OF THE INVENTION
With reference to FIG. 1 a shaft 12 is connected to a further structure, such as a disc 20, by a coupling generally indic
REFERENCES:
patent: 2206223 (1940-07-01), Dearborn
patent: 2303032 (1942-11-01), Dusevoir
patent: 2738210 (1956-03-01), Hjembo
patent: 2879092 (1959-03-01), Hargrove et al.
patent: 4053248 (1977-10-01), Schultenkamper et al.
patent: 4191487 (1980-03-01), Schultenkamper
Bertsch Richard A.
Richman Howard R.
Rolls-Royce plc
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