Joints and connections – Interfitted members – Radially interposed shim or bushing
Patent
1995-12-12
1997-09-30
Knight, Anthony
Joints and connections
Interfitted members
Radially interposed shim or bushing
403365, 403 31, F16D 109
Patent
active
056720262
DESCRIPTION:
BRIEF SUMMARY
The present invention generally relates to a friction clamp coupling of the type which can be used for clamp connection of a shape deformable sleeve or hollow shaft on a rotatable or axially displacable drive shaft. The invention is more particularly directed to such a friction coupling which comprises the sleeve or the hollow shaft and which, at the outer surface thereof, is formed with cone elements, cone elements matching the cone elements of the inner ring and which is/are adapted to cooperate with said cone elements of the inner ring and which, upon an axial displacement of the outer ring in relation to the inner ring, makes said shape-deformable inner ring become compressed thereby being pressed against the sleeve or the hollow shaft and being clamped to the drive shaft or the hollow shaft.
Many embodiments of friction couplings of this type are known in the art. For instance the Swedish laid out publication 425,182 (Forenade Fabriksverken) discloses a simple cone coupling apparatus of the said type, in which the inner cone sleeve and the outer cone sleeve can be pulled or pressed to an axial mutual displacement and to a clamp connection on a drive shaft by a screw means.
The U.S. Pat. No. 3,596,943 (W F Krauss) discloses a similar cone coupling apparatus comprising three cooperating cone parts which are likewise displaced in the axial direction in relation to each other by a screw means for clamp connecting an active part thereof to a drive shaft.
A special type of coupling is known from the Swedish laid out publication 429,993 (SKF Nova AB), in which the cone elements are split into several part elements which, in common, provide a saw-tooth shaped profile, as seen in an axial cross section. Cone elements designed accordingly give an improved clamp action, a possibility of controlling the clamp force in different parts of the friction coupling, and they make it possible to market the friction coupling with the sleeves thereof as an assembled integral unit. According to said laid out publication the saw-tooth shaped cone profile can be formed as two counter-directed threads having thread entries from each end of the sleeve and in which the threads meet at the axial centre of the inner cone sleeve. The outer cone sleeve is split into two like outer rings having an internal thread profile matching the thread profice of the inner ring, and the outer rings can be screwed onto the inner ring so as to engage each other with their meeting end surfaces. The outer rings can be pressed apart by a suitable screw means.
All the above mentioned friction clamp couplings of the known type are operated by some type of screw means. Normally large forces are needed for safely clamp connecting a machine part on a drive shaft by means of said cone coupling elements, and therefore it is generally necessary to use powerful screw means, and generally it is also necessary to use several screw means distributed round the coupling for providing the mutual displacement of the inner ring and the outer ring or rings. It may also be necessary to make use of inconveniently strong forces for tightening of the screws. It may also be difficult to calculate the tightening force, and thereby also the clamp force, so that said force is exactly the same for all tightening screws which are distributed round the coupling.
An attempt to solve the problem of obtaining a strong and equally distributed tightening force is illustrated in the Swedish laid out publication 448,315 (F Durand). In said publication a hydraulical pressure medium is used for providing the clamp action. In this case the inner ring is formed as two separate cone rings having the pointed cone ends facing each other, and there is also used two outer rings arranged so that they can be pressed apart actuated by the hydraulic medium. For making it possible to mount the two outer rings on the inner ring it is, however, necessary that the cone rings of said inner ring, named pressure rings, are formed separated from each other, so that they can be interconnected inside the two
REFERENCES:
patent: 3596943 (1971-08-01), Krauss
patent: 4364687 (1982-12-01), Adell
patent: 4407603 (1983-10-01), Lundgren
patent: 4425050 (1984-01-01), Durand
patent: 4824277 (1989-04-01), Adolfsson
ETP Transmission AB
Knight Anthony
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