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Expansion sleeve for applying precise circumferential stress
| Details |
Inventors: Hofmann, Hans; Ziegler, Heinz;
Assignee: Emuge-Werk Richard Glimpel Fabrik fur Prazisionswerkzeuge (Lauf, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
An expansive sleeve provided with at least one stress cover associated with a hollow workpiece, which stress cover is provided with basically annular thickened regions bearing respective stress surfaces. It is desired that these outer stress surfaces be essentially in the form of cylindrical casing surfaces but that there be no radial outbowing of the individual stress surface so as to form a contact locus in the form of an arc resulting from a peak. This is achieved in that the basically annular thickened regions each comprise a protruding structure equipped with a cylindrical stress surface. With this expansive sleeve, the stress surface is no longer subject to bowing and formation of a peak contact locus comprised of an arc, because the stress surface is on the protruding structure. |
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DETAILED DESCRIPTION In the invented expansive sleeve, or bushing, the stress surface, which is comprised in a cylindrical surface and is generally annular in form, is no longer subject to bowing and the formation of a peak's arc-like contact locus because the stress surface is on the protruding structure which comprises a thickened region adjacent to the stress cover.
The result is the avoidance of the above-mentioned disadvantages associated with the bowing phenomenon.
The protruding structures do not bring about, or only negligibly produce, an outward bowing of the stress cover itself, and thus have no or only negligible effect on the elastic properties of the overall expansive sleeve, since the grooves confer sufficient elastic expansibility to each stress cover.
The item to which radially outward stress is to be applied by the invented sleeve may be a workpiece, a tool or another hollow object for which precise centering is important.
The grooves delimiting the protruding structures run, only in the circumferential direction.
It is particularly advantageous if the following are provided in alternating fashion around the circumference of the sleeve: protruding segments with cylindrical casing stress surfaces, and transverse, axial grooves which may run at an angle to the central axis of the sleeve.
With this configuration, the width of a groove (at the base) is always equal to or less than the axial width of the casing surface of the protruding structure.
Thereby, the elastic movements of the expansive sleeve are optimally employed.
As a rule, more than three transverse grooves are provided.
With axially running grooves, it is conceivable that the protruding structures may extend over the entire width of the stress surface.
It is particularly advantageous if only one or two protruding structures are provided along the axial length of the expansive sleeve.
These ring-like structures, which may be subdivided along the circumference by axial, transverse grooves, yield, to a sufficient degree, a cylindrical stress surface
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