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US 4,729,569 AGranted
Twist proof seal ring arrangement for shafts
AssigneeMartin Merkel GmbH & Co KG
InventorsHeinz K. Muller, Andreas Wolf
Life of this patent
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AssigneeMartin Merkel GmbH & Co KG
InventorsHeinz K. Muller, Andreas Wolf
Estimating the term…
Means for preventing relative twisting between a seal ring and the parts of structure accommodating it by providing that in connection with high pressure shaft seals, the axial thrust resulting from the action of the pressure of the seal ring on its low pressure side radial face is taken up by a number of projections, the cross section of the seal ring undergoing undulating deformation as seen in the circumferential direction owing to the axial flexure of individual parts of the seal ring; it is furthermore possible to have additional projections as means for preventing twisting. As a consequence of the undulation of the entire cross section of the seal ring there will also be the useful effect of undulation of the seal interface edge, constituted by parts of this cross section, on the high pressure side.
A shaft seal for sealing off a pressure fluid present between a cylindrical shaft and a housing part surrounding the shaft, comprising an elastic seal ring arranged between said housing part and a circumferential sliding surface portion of said shaft, said seal ring defining a high pressure end face in contact with said pressure fluid and an opposite low pressure end face, a back-up ring mounted in said housing part opposite said low pressure end face, said back-up ring being provided with a plurality of axial projections, directed against said low pressure end face of the seal ring, whereby an axial thrust exerted by said pressure fluid against said seal ring is taken up by said projections thus producing an undulating deformation on said low pressure end face.
Dependencies are inferred from the claim text.