Patent ID: 7478815

Claim:
A sealing arrangement comprising: a first machine part ( 4 ) having a groove ( 3 ); a second machine part ( 5 ) having an outer peripheral surface ( 7 ) opposite the groove ( 3 ) and spaced apart from the first machine part ( 4 ) by a gap ( 26 ); a sealing ring ( 1 ) disposed in the groove adjacent the peripheral surface ( 7 ), the sealing ring ( 1 ) including a shaped section having a central sealing surface ( 6 ) parallel to the outer peripheral surface ( 7 ), the central sealing surface ( 6 ) merging on both sides in steps into two shoulder surfaces ( 13 , 14 ), the shoulder surfaces ( 13 , 14 ) intersecting inclined surfaces ( 17 , 18 ) at edges ( 23 , 24 ), both edges being in a spaced apart relationship with the outer peripheral surface ( 7 ) and both shoulder surfaces ( 13 , 14 ) being parallel to the outer peripheral surface ( 7 ) the shoulder surfaces ( 13 , 14 ) each being connected to side surfaces ( 19 , 20 ) of the sealing ring ( 1 ) via the inclined surfaces ( 17 , 18 ) which extend transversely to the outer peripheral surface ( 7 ), whereby the inclined surfaces ( 17 , 18 ) intersect the side surfaces ( 19 , 20 ) at further edges ( 21 , 22 ); wherein the sealing ring ( 1 ) has a substantially trapezoidal cross-sectional shape, wherein the rear side ( 25 ) of the sealing ring ( 1 ) is parallel to the outer peripheral surface ( 7 ), and sealing ring side surfaces ( 19 , 20 ) are disposed at an angle to groove flanks ( 11 ); the angle relationship of the side surfaces ( 19 , 20 ) to the groove flank ( 11 ) enabling pivoting of the sealing ring ( 1 ) about the central sealing surface ( 6 ) thereby enabling sealing contact being the edge ( 23 ) and the peripheral surface ( 7 ) with an annular space ( 28 ) between the sealing contact and the central sealing surface ( 6 ) and simultaneous full contact between the side surfaces ( 19 , 20 ) and the groove flanks ( 11 ), the annulus space ( 28 ) defining spaced apart seals between the sealing ring and the peripheral surface ( 7 ); and a tensioning ring ( 2 ) disposed in the groove ( 3 ) against a rear side ( 25 ) of the sealing ring ( 1 ).