Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Element is plate with external edge completely surrounding...
Patent
1986-03-07
1988-05-03
Stodola, Daniel P.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Element is plate with external edge completely surrounding...
464 98, F16D 379
Patent
active
047417226
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a torsionally rigid, elastically flexible shaft coupling having at least one elastic disk disposed at right angles to the axis of rotation on which cams of both coupling halves act.
Such a shaft coupling is known from German Gebrauchsmuster No. 73 21 095. There a disk made of stratified membranes is used as an elastic transmission element between two coupling halves. Cams on one coupling half act on both sides from the inner edge of the membrane package. Here one cam is constructed as a collar on the coupling half, while the other cam, designed as an annular disk, sits torsionally rigidly on a journal of this coupling half. The cams of this coupling half and the membrane package are frictionally and form-locking connected by means of through-screws. In this way a double-shear fastening of the membrane package to this coupling half is achieved.
The outer edge of the membrane package of the known shaft coupling is surrounded by cams of the other coupling half. The connection between these cams and the membrane package is produced here by rivets. However, because only the cams acting on one side of the membrane package are connected in a torsionally rigid manner to the assigned coupling half, there is only single-shear fastening of the membranes to the coupling half. By the double-shear fixing at the inner edge and the single-shear fixing at the outer edge of the membrane package, allowances are made for the variable large forces acting on various radii. However there is unharmonic transmission of the forces between their points of application on the membrane package. The membrane package, which is tangentially stressed thereby, is overdimensioned in its cross-section with regard to the lower forces acting on the outer edge of the membrane package. This, however, results in a higher bending resistance for the membrane package.
The object of the invention is to increase the loading capacity of a shaft coupling with improved flexibility.
This object is solved in the present invention by providing a flexible annular elastic disk or ring and arranging the points of application or fastening of the cams of both coupling halves which enclose both sides of the ring to lie at least approximately on one radius.
The solution is advantageous insofar that a torque is transmitted by forces from the cams of one coupling half to the flexible annular disk and from this to the cams of the other coupling half on one radius. The forces acting at the points of application of the cams are therefore the same size and the annular disk is subject to substantial compression stress and tensile stress. On the basis of this regulated transmission of force, the annular disk is uniformly stressed, so that, in comparison with the state of the art, it can have a smaller cross-section with the same transmitting capacity and improved flexibility. The transmitting capactity of the coupling is substantially increased in comparison with the known design by the multi-shear fixing of the cams of both coupling halves to the elastically flexible annular disk on a comparatively large radius.
Advantageous refinements of the invention are described below.
The cams of one coupling half are formed as radially inwardly extending tongue-like plates that extend inward from the external mounting periphery of the one coupling half. The cams of the other coupling half are formed as radially outwardly extending tongue-like plates that extend outwardly from the internal mounting periphery of the other coupling half. The tongue-like plates overlap, in the direction of the related coupling half, into a closed circular ring concentric to the axis of rotation. This ensures that cams are very strong while simultaneously decreasing their mass enabling them to surround the annular disk on both sides.
Additional refinements of the invention may be included to increase the multiple-shearing of the connection between the annular disks or annular disk packages respectively and the cams. Such refinements may include providing at least two annular dis
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