Joints and connections – Interfitted members – Rotary binding cam or wedge
Patent
1993-07-09
1995-06-27
Look, Edward K.
Joints and connections
Interfitted members
Rotary binding cam or wedge
403351, 403367, F16B 202
Patent
active
054274680
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
Coupling elements for the frictional connection of an outer component to a shaft are known in numerous different embodiments.
DESCRIPTION OF THE PRIOR ART
German Utility Model 1,895,907 discloses a coupling element of this kind which is used to connect two aligned, abutting shaft ends of the same diameter. This joint is bridged by an internally cylindrical bush part which fits onto the shaft ends, is longitudinally slotted at one point and, axially in series on the outer circumference, has a thread and a tapered surface, the wall thickness of which decreases in the direction away from the thread. Seated on the tapered surface is an unslotted taper ring which is pressed onto the tapered surface by a threaded ring screwed onto the threaded part, the tapered surface taking up ring tensile stresses and, by radial compression, connecting the bush part frictionally to the two shaft ends.
Swiss Patent 265,280 discloses a coupling element which is used for coupling a connecting flange to the shaft. Once again, there is a bush part with an outer tapered surface and an axially adjoining thread. A threaded ring pulls the connecting flange onto the tapered surface.
In the case of one of the coupling elements according to French Patent 1,361,776, the bush part is designed as a double-taper ring, the maximum wall thickness of which lies in the center and which bridges the joint between two aligned shaft ends having the same diameter. Seated on the two outer tapered surfaces are two unslotted outer taper rings which are pulled towards one another by individual screws distributed over the circumference and, in the process, clamp the double-taper ring radially on the shaft ends. In another embodiment, there is only a single-taper ring to which a radially projecting outer component is integrally connected. The outer taper ring can be pulled onto the tapered surface of the bush part by a number of screws which are distributed over the circumference and engage in the outer component.
A similar embodiment forms the subject-matter of DE-A 1,294,751. Here, the outer component has a cylindrical axial extension on which is arranged a thin-walled compression ring which is designed as a double-taper ring, seated on the tapered surfaces of which are two unslotted taper rings which are pulled towards one another by screws distributed over the circumference and clamp the compression ring and the cylindrical extension on the shaft.
Common to all the embodiments described is the use of threads in addition to tapered surfaces, which bring about the axial displacement necessary for the frictional clamping by means of the tapered elements. The need to have threads in addition to tapered surfaces not only increases the structural complexity but makes assembly more difficult because large rotary travels have to be performed, many times in the case of the embodiments with the screws distributed over the circumference, with the additional problems associated with skewed tightening.
SUMMARY OF THE INVENTION
The object of the invention is to specify a coupling element for the frictional connection of an outer component to a shaft, which coupling element is of simpler configuration and is simpler to actuate.
This object is achieved by providing a coupling element for the frictional connection of an outer component to a shaft, having a bush part which is arranged with its inner circumferential surface on the shaft. The bush part has a longitudinal slot, over at least part of its length, at least one point, as viewed in the circumferential direction. A rotatable, circumferentially undivided clamping ring is arranged on the bush part at the level of the longitudinal slot and the inner circumferential surface.
The clamping ring interacts with the outer circumferential surface of the bush part, allowing the bush part to be compressed radially when the clamping ring is rotated and to be clamped fast with frictional engagement on the shaft.
The bush part has an outer circumferential spiral surface which is axially at the lev
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Larson James A.
Look Edward K.
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