US3810640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing ring arrangement
Assignee: SRM Hydromekanik AB
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Filing: 1972-03-01
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Granted: 1974-05-14
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Expires: 1992-03-01
Abstract
Abstract A sealing arrangement for forming a seal between inner and outer relatively rotating parts. A sealing ring is mounted in a groove in the inner part and it contacts a cylindrical surface on the outer part. The contacting surfaces of the sealing ring with the outer part and the groove constitute sealing surfaces and at least one of these sealing surfaces is porous and made of material having a low coefficient of friction. The porous and low coefficient of friction material may comprise a layer on either the outer part or the sealing ring or the sealing ring may be made of such material. An example of such a material is molybdenum.
Inventors
- 👤 K Ahlen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
149 words
In a device including an inner rotating part which rotates in and relative to an outer part and which remains in the same axial position relative to the outer part, a sealing ring arrangement for forming a seal between said inner and outer parts in which a sealing ring is mounted in a groove in the inner part and contacts a cylindrical surface on the outer part, the contacting surfaces of the sealing ring with the outer part and of the sealing ring with the groove constituting sealing surfaces, said device including means forming a fluid pressure differential axially across said sealing ring, at least one contacting surface of at least one of said sealing surfaces being sufficiently porous to permit a limited flow of fluid to pass therethrough due to said pressure differential thereacross and said sealing surfaces made of a material having a low coefficient of friction.
Claim 2
Dependent Claim
149 words
In a device including an inner rotating part which rotates in and relative to an outer part and which remains in the same axial position relative to the outer part, a sealing ring arrangement for forming a seal between said inner and outer parts in which a sealing ring is mounted in a groove in the inner part and contacts a cylindrical surface on the outer part, the contacting surfaces of the sealing ring with the outer part and of the sealing ring with the groove constituting sealing surfaces, said device including means forming a fluid pressure differential axially across said sealing ring, at least one contacting surface of at least one of said sealing surfaces being sufficiently porous to permit a limited flow of fluid to pass therethrough due to said pressure differential thereacross and said sealing surfaces made of a material having a low coefficient of friction.
Claim 3
Dependent Claim
28 words
The invention according to claim 1 wherein said at least one contacting surface is coated with a porous layer of said material having a low coefficient of friction.
Claim 4
Dependent Claim
27 words
The invention according to claim 2, wherein the coating is made of molybdenum, which is flame sprayed or flame plated onto the at least one sealing surface.
Claim 5
Dependent Claim
45 words
The invention according to claim 1, wherein the sealing ring includes flat side surfaces perpendicular to the axis of relative rotation, said flat sides along being porous and formed of a material having a low coefficient of friction, and said flat porous surfaces being ground.
Claim 6
Dependent Claim
28 words
The invention according to claim 4, the outer cylindrical surface of the sealing ring being unground and wherein both of said inner and outer parts are of aluminum.
Claim 7
Dependent Claim
53 words
The invention according to claim 1, in which the said at least one porous surface is on the sealing ring and is ground and wherein at least one of the facing surfaces of the inner and outer parts, in the vicinity of the contacting sealing surfaces, is made of steel and is machined.
Claim 8
Dependent Claim
44 words
The invention according to claim 1, wherein at least one of said inner and outer parts is aluminum and including at least one hard insert cast into one of said aluminum parts in position to constitute at least one of said contacting sealing surfaces.
Claim 9
Dependent Claim
64 words
The invention according to claim 1, wherein said inner and outer parts are a turbine shaft and a part of the stationary casing, respectively, in a hydraulic torque converter of the type in which fluid is delivered to and from the converter, the said at least one porous sealing surface of the sealing ring sealing between steel surfaces of said inner and outer parts.
Claim 10
Dependent Claim
64 words
The invention according to claim 1, wherein said inner and outer parts are a turbine shaft and a part of the rotating Casing, respectively, in a hydraulic torque converter, of the type in which fluid is delivered to and from the converter, the said at least one porous sealing surface of the sealing ring sealing between steel surfaces of said inner and outer parts.
Claim 11
Dependent Claim
63 words
The invention according to claim 1, in which at least the outer surface of the sealing ring is porous and it seals against a relatively rotating part, and wherein the porosity of the porous part is such as to permit a limited flow of oil in the axial direction from one side of the sealing ring to the other due to differential pressure.
Claim 12
Dependent Claim
11 words
The invention according to claim 1, wherein said material is molybdenum.
Claim 13
Dependent Claim
13 words
The invention according to claim 1, wherein said material is a sintered material.
Claim 14
Dependent Claim
18 words
The invention according to claim 11, wherein said porous material is flame sprayed onto its respective contacting surface.
Claim 15
Dependent Claim
18 words
The invention according to claim 1, wherein said porous material is flame coated onto its respective contacting surface.
Claim 16
Dependent Claim
40 words
The invention according to claim 1, wherein the sealing ring is flame coated with said porous material on its circumferential outer surface and on the radial side surfaces of the ring, the porous material on the side surfaces being ground.
Claim 17
Dependent Claim
23 words
The invention according to claim 15, wherein the flame coated porous material on the circumferential outer surface of the sealing ring is unground.
Claim 18
Dependent Claim
12 words
The invention according to claim 16, wherein said outer part is aluminum.
Claim 19
Dependent Claim
39 words
The invention according to claim 11, wherein the said porous contacting surface is on the sealing ring, and the other contacting surface engaged by the porous surface is machined with a cutting tool without heat treatment of said surface.
Claim 20
Dependent Claim
14 words
The invention of claim 18, said machined surface being on the inner rotating part.
Claim 21
Dependent Claim
15 words
The invention according to claim 18, said machined surface being on the outer rotating part.
Claim 22
Dependent Claim
13 words
The invention according to claim 18, said machined surface being made of steel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |