Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Element is plate with external edge completely surrounding...
Patent
1986-02-26
1988-04-12
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...
F16D 379
Patent
active
047371366
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a torsionally rigid, elastically flexible shaft coupling.
For such a shaft coupling, known from German Gebrauchsmusterschrift No. 74 35 748, membranes are provided with asymmetrically formed openings so that the spokes formed between the openings are inclined radially. To the inner and outer root of each spoke is assigned one hole, respectively for clamping the membranes at the inner and outer edge to their two coupling halves by means of screws. There are no more fixing bores at the edge zones of the membranes other than said one hole per spoke. Therefore the membranes and spokes are forced into coincidence when stacked one on top of another. In such shaft couplings, the clamping screws of the membranes are strongly loaded, as the coinciding spokes of the stacked membranes, which are subject to bending stress, act on just one of the associated screws respectively. Thereby, the edge zones of the membranes extending between the clamping bores are not brought into action for torque transmission as no screw couplings are provided there.
As such shaft couplings are exposed to high alternating stresses, it is necessary to check their operability from time to time. In order to do so, the coupling must be dismantled, particularly in order to check the spokes of the membranes for cracks and deformation. This is especially expensive in time and cost.
The object of the invention is to increase the loading capacity of the shaft coupling. That type of coupling generally has at least two membranes as force transmission elements. The membranes are provided at their outer and inner edges with regularly spaced bores for clamping screws to interconnect the two coupling halves. The intermediate areas of the membranes are provided with uniformly spaced openings. This structure also makes possible the checking of the proper functioning of the membranes without dismantling them.
This object is attained by rotationally arranging the membranes so that they are offset with respect to each other by a fraction of the spacing of their openings. In addition, fixing bores are provided which are disposed with a spacing which is at most half of the said openings so that the bores for the clamping screws are aligned. This solution offers the advantage that the spokes of the membranes are at least partially visible through the openings in the membranes and they are accessible for inspection for deformation or cracks. On the basis of the mutually offset membranes, different clamping screws respectively on the two coupling halves are assigned to the spokes, so that the force of the torque to be transmitted by the coupling is distributed more uniformly over the inner and outer periphery of the coupling halves. The transmission of forces from the spokes of the membranes to the clamping screws on the outer and inner edge of the membranes is distributed to a greater number of screws in this way and thus more harmoniously.
The purpose of having the openings have at least the angular width of the spokes between two openings is that, when using two membranes in the shaft coupling, the full width of the respective spokes of one membrane are visible through the openings of the other membrane and the spokes are easily controllable. For this purpose, the peripheral direction of the openings of the membranes have at least the same clear width which corresponds to the width of a membrane spoke passing between two openings. The spoke here referred to is that portion of the membrane which extends between two adjacent openings. Indeed, it is known from DE Gebrauchsmusterschrift No. 74 35 748 that the spokes of one membrane shall coincide with the openings of the adjacent membrane. However, there is no indication that this measure is to be provided for the purpose of inspecting the membranes.
With the additional disposing of membranes axially, a sound test for the membranes is also envisaged, apart from a visual inspection. In this way, the appropriate exposed membrane spoke can be struck and the lack of damage or damage can be asce
REFERENCES:
patent: 2588668 (1952-03-01), Syrouy
patent: 3677031 (1972-07-01), Zierak et al.
patent: 3808837 (1974-05-01), Anderson et al.
patent: 4523916 (1985-06-01), Kizler et al.
"Engineering Materials & Design", Band 22, Nr. 4, Apr. 1978, pp. 52-56, Design Evaluation of the Metastream Coupling.
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