Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Element is plate with external edge completely surrounding...
Patent
1991-11-05
1994-11-15
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...
464147, F16D 379
Patent
active
053643097
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a flexurally resilient coupling element consisting of two membrane discs connected to each other in their radially outer peripheral zone and at least one connecting part welded onto the radially inner periphery of one of these membrane discs.
Such a coupling element is known from EP-A1 211 090.
Where such a coupling element is concerned, the invention is based on the problem of ensuring that the tension pattern within the coupling element, particularly under tractively incident axial forces and angular deflections due to radial and angular offset between adjacent shafts is more favourable.
In order to resolve this problem, it is according to the invention proposed that radially inwardly directed peripheral surfaces on the connection part and on the associated membrane disc which are situated in the radially inner peripheral zone are flush with and adjacent one another and in that the radially outer connecting zone of the membrane discs and the radially inner connecting zone of the connection part and of the associated membrane disc are so radially resilient that in the event of a deformation of the membrane discs by an increase in the axial gap between the membrane discs in their radially inner peripheral zones there can be a resilient reduction .DELTA.R in diameter of the radially outer connecting zone and a resilient increase .DELTA.r in diameter of the radially inner connecting zone.
For a favourable tension pattern, it is furthermore advantageous if radially outwardly directed peripheral surfaces of the connection part and of the associated membrane disc which are situated in the radially inner peripheral zone are flush with and adjacent one another.
The basic thought underlying the invention is particularly applicable if a sleeve-shaped connection part is adjacent the radially inner peripheral zone of each membrane disc, these connection parts being directed away from one another. At the same time, the connection parts may have at their remote ends respective radially outwardly directed radial flanges, particularly screwed flanges.
Having regard to differing installation circumstances, it is recommended that the radial flanges be at different axial distances from the relevant associated membrane disc. In particular, this provides an opportunity whereby the radial flange which is disposed at a shorter axial distance from the associated membrane disc is at such an axial distance from the associated membrane disc that when screwed joints are applied, screwthreaded nuts can be incorporated between radial flange and the associated membrane disc and so that the other radial flange which is disposed at a greater axial distance from the associated membrane disc is at such an axial distance from the associated membrane disc that when screwed connections are applied, screwthreaded bolts can be incorporated between this radial flange and the associated membrane disc.
One possibility of trimming the inherent frequency of the coupling element to a desired level resides in incorporating between the two membrane discs, at least in the radially outer peripheral zone of the disc-shaped space enclosed between them a filling composition consisting in particular of an elastomeric material.
The coupling elements according to the invention are particularly suitable for the rotationally rigid transmission of high torque levels at simultaneously very high rotary speeds and they fulfil an equalising function in the event of axial, radial and angular offset between two coupled shafts, as the result of resilient deformation.
The invention further relates to a method of producing a flexurally resistant coupling element which consists of two membrane discs connected to one another in their radially outer peripheral zone and at least one connecting part welded onto the radially inner periphery of one of these membrane discs, the connection part and the said one membrane disc being constructed in the welded joint area with oppositely radially directed centring surfaces intended to bear on one another and wi
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"Bendix Contoured Diaphragm Couplings" brochure, Bendix Fluid Division, Dec. 1982.
"Flexible Power Transmission Systems" brochure, Bendix Fluid Power Division, Feb. 1983.
"BHS Membrankupplung" brochure, BHS Werk Sonthofen, Apr. 1985.
Heidrich Guenther
Muller Siegfried
BHS-Bayerische Berg-Hutten-und Salzwerke AG
Dunn Eileen A.
Stodola Daniel P.
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