Seal ring assembly
AssigneeHall & Hall Limited
InventorBrian Geoffrey Eastwood
Life of this patent
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Abstract
A sealing ring assembly consists of (i) a preferably unreinforced sealing ring (ii) a harder supporting ring adjacent an axial side of the sealing ring and having lips extending axially to overlap the sealing ring at both its radially outer and inner peripheries, the radially inner lip being axially shorter than the radially outer one, and (iii) a bearing ring separate from the supporting ring. In a double-acting assembly there are two rings (ii) and (iii) arranged successively and respectively at each axial side of the sealing ring.
Claims10
A seal ring assembly comprising
- a. a sealing ring which is an annulus about a central axis, the sealing ring
- i. having a radially inner and a radially outer periphery
- ii. having a working surface at one of the radially inner and radially outer peripheries
- b. a supporting ring which is an annulus about a central axis and of generally the same radius as the sealing ring, the supporting ring
- i. being harder than the sealing ring and
- ii. having a radially inner and a radially outer periphery and
- iii. having a lip extending axially in one axial direction at the radially inner periphery and
- iv. having a lip extending axially in the one axial direction at the radially outer periphery, the lip at the one of the radially inner and outer peripheries which corresponds to that periphery of the sealing ring which has the said working surface extending axially further than the other said lip, and
- v. being separate from the sealing ring;
- and
- c. a bearing ring separate from the supporting ring and being harder than the sealing ring and having one radial periphery of substantially the same radius as the periphery of the sealing ring which provides the working surface whereby the rings may be placed axially side by side in a seal ring assembly with the sealing ring adjacent to the supporting ring and the supporting ring adjacent the bearing ring, the sealing ring being overlapped and supported at its radially inner and outer peripheries by the lips of the supporting ring, the working surface being supported by the lip of greater axial extension.
In a seal ring assembly comprising a sealing ring, a separate support ring to be energized by the sealing ring and having a lip extending axially to the dynamic working surface of the sealing ring at one radial periphery thereof to protect it against extrusion and rolling, and a separate bearing ring, the improvement comprising a further lip projecting axially from the support ring to overlie the sealing ring at the other radial periphery thereof, the said further lip being of less axial length than the first-mentioned lip.
Dependencies are inferred from the claim text.