CA2031557A1 - Seal for elongated axially movable machine part - Google Patents
Seal for elongated axially movable machine partInfo
- Publication number
- CA2031557A1 CA2031557A1 CA002031557A CA2031557A CA2031557A1 CA 2031557 A1 CA2031557 A1 CA 2031557A1 CA 002031557 A CA002031557 A CA 002031557A CA 2031557 A CA2031557 A CA 2031557A CA 2031557 A1 CA2031557 A1 CA 2031557A1
- Authority
- CA
- Canada
- Prior art keywords
- seal
- ring
- machine part
- support surface
- wiper ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/04—PTFE [PolyTetraFluorEthylene]
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Devices (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
- Glass Compositions (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
ABSTRACT
A seal for an elongated axially movable machine part, such as a piston or rod, having a wiper ring 2 supported in a first groove 1 radially open towards the machine part 4. The wiper ring is urged against the machine part by an O-ring 3 of rubber-elastic material, which abuts the radially outer surface of the first groove and rests in a second groove on the wiper ring. The wiper ring bears on the machine part along at least two circular seal edges 7.7', spaced apart in axial direction. The second groove opens radially outwards in the axial direction and provides a support surface 8 for the O-ring and axially overlaps the radial planes 9,9' containing the respective seal edges as a continuous surface.
A seal for an elongated axially movable machine part, such as a piston or rod, having a wiper ring 2 supported in a first groove 1 radially open towards the machine part 4. The wiper ring is urged against the machine part by an O-ring 3 of rubber-elastic material, which abuts the radially outer surface of the first groove and rests in a second groove on the wiper ring. The wiper ring bears on the machine part along at least two circular seal edges 7.7', spaced apart in axial direction. The second groove opens radially outwards in the axial direction and provides a support surface 8 for the O-ring and axially overlaps the radial planes 9,9' containing the respective seal edges as a continuous surface.
Description
~ 2~3~
SEA~ FOR ELONGATED ~XIALLY MOVABLE MACHINE PART
The present invention relates to a seal for a movable machine part, such as a piston or rod, comprising a wiper ring supported in a first groove radially open towards the relatively movable machine part, and an O-ring of rubber-elastic material, fitting in a second groove in the wiper ring and abutting against the radially outer surface of the first groove. The wiper ring touches the machine part along at least two circular seal edges, spaced apart in the axial direction. The second groove forms a radially outwardly opening support surEace for the O-ring.
A seal of this type is disclosed in DE-OS 37 38 988, in which the second groove is of trapezoidal shape and is configured so that the 0-ring is captured in the axial dlrection during use. It is thus subject to considerable deformatiGn. Such sealing arrangement ` consequently has less than satisfactory serviceability characteristics.
~ It is an object of the present invention to provide a seal;.~ for a machine part of long service life and good functional :
~ reliability.
, In the present disclosure the second groove for~ing a ~ ~ support surface extends in the axial direction over and beyond the -' ~ radial planes of all the seal edges as a continuous surface. The elasticity inherent in the O-ring can then be exploited in a particularly satisfactory manner and it is possible to reduce its elastic pre-stress, and achieve good sealing with comparatively little elastic deformation of the O-ring This delays the onset of fatigue pheno~ena and results in a greatly improved service life.
.1 The support surface can have a concavely curved profile ; which i~proves the relative mobility of the O-ring and permits it breathing or self adjusting relief movements between successive operating cycles. Local overloading of the O-ring is thus reduced or prevented. Particularly good results are obtained if the profile of ~-i the surface is evenly curved.
: "~
SEA~ FOR ELONGATED ~XIALLY MOVABLE MACHINE PART
The present invention relates to a seal for a movable machine part, such as a piston or rod, comprising a wiper ring supported in a first groove radially open towards the relatively movable machine part, and an O-ring of rubber-elastic material, fitting in a second groove in the wiper ring and abutting against the radially outer surface of the first groove. The wiper ring touches the machine part along at least two circular seal edges, spaced apart in the axial direction. The second groove forms a radially outwardly opening support surEace for the O-ring.
A seal of this type is disclosed in DE-OS 37 38 988, in which the second groove is of trapezoidal shape and is configured so that the 0-ring is captured in the axial dlrection during use. It is thus subject to considerable deformatiGn. Such sealing arrangement ` consequently has less than satisfactory serviceability characteristics.
~ It is an object of the present invention to provide a seal;.~ for a machine part of long service life and good functional :
~ reliability.
, In the present disclosure the second groove for~ing a ~ ~ support surface extends in the axial direction over and beyond the -' ~ radial planes of all the seal edges as a continuous surface. The elasticity inherent in the O-ring can then be exploited in a particularly satisfactory manner and it is possible to reduce its elastic pre-stress, and achieve good sealing with comparatively little elastic deformation of the O-ring This delays the onset of fatigue pheno~ena and results in a greatly improved service life.
.1 The support surface can have a concavely curved profile ; which i~proves the relative mobility of the O-ring and permits it breathing or self adjusting relief movements between successive operating cycles. Local overloading of the O-ring is thus reduced or prevented. Particularly good results are obtained if the profile of ~-i the surface is evenly curved.
: "~
2~3~7 To obtain good relative mobility of the O--ring during use, it is advantageous that the profile have a radius of curvature greater than that of cross section of the 0-ring. Preferably the ratio of the radius of curvature of the profile of the support surface and the S radius of curvature of the 0-ring in toral section should be between 2:1 to 3:1.
The support surface can be exten~ed into the region of the axially outer defining surfaces of the wiper ring and optiona].ly, at least in the region between the radial planes of the seal edges, can have a flattened profile which can be configured to be substantially cylindrical.
Good sealing action for media under high pressure is obtained if the support surface is so inclined that a tangent at the region between the radial planes of the sealing edges in the axial direction toward the sealed space subtends with the axis an acute ~; angle A that yreferably is within the range of, and does not exceed, 5 to 20. The seal edge remote from the sealed space is thus sub~ected to a greater load during the pressure phase of operation in the sealed space than t~le seal edge closer to the sealed space which precedes it, and this prevents the development of over-pressure exceeding designed operating levels in the intervening space between , the seal edges.
More particularly, in accordance with the invention there is provided a seal for an elongated axially movable machine part extending ~rom a space under pressure to be sealed comprising, a wiper ring supported in a first annular groove open in radially inward direction toward the movable machine part, an 0-ring of rubber-elastic materialt bearing against the ~-~ wiper ring in a second groove formed in said wiper ring and abutting :::,.!
against a radially outer surface of the first groove, the wiper ring ~` touching the relatively movable machine part along at least two circular seal edge, spaced apart in axial direction of said machine part, the second groove opening axially outwardly in radial direction and defining a support surface for said 0-ring on said wiper ring, the :: .: . : , , ~
, . :: .: . :
, , - , . i . ~
- , ~ - ,~ . ~ : . .
i . : . : ,: ~ .
2~31~7 support surface axially overlapping radial planes (93 intersecting the seal edges (7) as a continuous surface, Embodiments of the invention will now be described with reference to the accompanying drawings wherein;
Figure 1 shows a side view in partial section of a rod seal embodying the present invention;
Figure 2 and Figure 3 show sections of embodiments of two differently configured wiper rings for substitution in the unit of Figure 1.
The rod seal shown in Figure 1 comprises a wiper ring 2, preferably of PTFE, supported in a first groove 1 open in the radially inward direction of a piston rod 4, and an O-ring 3 of elastomeric rubber material between the outer face 12 of the groo~e and the wiper ring. The O-ring 3 also fits in a second groove 13 in the wiper ring 2. The wiper ring 2 touches the piston rod along two circular seal edges 7 and 7' spaced apart in the axial direction. The associated radial planes of the seal edges 7,7' are respectively indicated at 9,9'.
'! The second groove 13 forms a continuous supporting surface 8 - 20 that extends in the axial direction and beyond the radial planes 9,9' of the seal edges 7,7' and beyond the radial planes of any additional . seal edges if more than two are provided in any particular instance.
Each of the seal edges 7,7' is formed by a pair of conical surfaces ` which intersect one another, and where that conical surface proximate ; 25 to the sealed space subtends a greater angle w}th the axis of the machine part and seal than does the other surface of the pair. The seal edges form part of sealing lips 6,6' which are separated from one another in the axial direction by an intervening space 5.
~: In the embodiment shown in Figure 1, the support surface 8 is formed as an evenly curved surface. The radius of curvature is ~'~ some 2.5 times greater than the radius of curvature of the O-ring 3.
The support surface 8 extends to the axially outer surfaces 16,16' of ~ the wiper ring 2.
:
, ,; ,.... ~ , ::
" , .. :.:, ... : , . .
: : ,. . , :
2~31~7 ~.
The wiper ring, whose half section is shown in Figure 2, differs from the embodiment described above in that the support surface 8 is not as greatly curved in the region 10 between the radial I planes 9,9' of the seal edges 7,7' as in the zones 17,18 that lie axially outside the region 10. The support surface 8 can have a somewhat flattened profile within the region 10 and can optionally be cylindrically configured.
~ The embodiment shown in Figure 3 differs from those earlier :~ described in that the support surface 8 is so inclined that a tangent 11 in the axial direction between the radial planes 9,9' of the seal edges 7,7' subtends an acute angle A with the axis on the sealed space side 15 that does not exceed 5 to 20 (preferably 18).
In the embodiment shown, this angle is 18 and enables good sealing of fluid under considerable pressure in space 15 over long periods of : lS time.
,.~ !
~'''''''' .. . .
~','''.
~,' ~' :
. . . ' ; , ~ , , ". : ,: -- : ' : , ,`: :
The support surface can be exten~ed into the region of the axially outer defining surfaces of the wiper ring and optiona].ly, at least in the region between the radial planes of the seal edges, can have a flattened profile which can be configured to be substantially cylindrical.
Good sealing action for media under high pressure is obtained if the support surface is so inclined that a tangent at the region between the radial planes of the sealing edges in the axial direction toward the sealed space subtends with the axis an acute ~; angle A that yreferably is within the range of, and does not exceed, 5 to 20. The seal edge remote from the sealed space is thus sub~ected to a greater load during the pressure phase of operation in the sealed space than t~le seal edge closer to the sealed space which precedes it, and this prevents the development of over-pressure exceeding designed operating levels in the intervening space between , the seal edges.
More particularly, in accordance with the invention there is provided a seal for an elongated axially movable machine part extending ~rom a space under pressure to be sealed comprising, a wiper ring supported in a first annular groove open in radially inward direction toward the movable machine part, an 0-ring of rubber-elastic materialt bearing against the ~-~ wiper ring in a second groove formed in said wiper ring and abutting :::,.!
against a radially outer surface of the first groove, the wiper ring ~` touching the relatively movable machine part along at least two circular seal edge, spaced apart in axial direction of said machine part, the second groove opening axially outwardly in radial direction and defining a support surface for said 0-ring on said wiper ring, the :: .: . : , , ~
, . :: .: . :
, , - , . i . ~
- , ~ - ,~ . ~ : . .
i . : . : ,: ~ .
2~31~7 support surface axially overlapping radial planes (93 intersecting the seal edges (7) as a continuous surface, Embodiments of the invention will now be described with reference to the accompanying drawings wherein;
Figure 1 shows a side view in partial section of a rod seal embodying the present invention;
Figure 2 and Figure 3 show sections of embodiments of two differently configured wiper rings for substitution in the unit of Figure 1.
The rod seal shown in Figure 1 comprises a wiper ring 2, preferably of PTFE, supported in a first groove 1 open in the radially inward direction of a piston rod 4, and an O-ring 3 of elastomeric rubber material between the outer face 12 of the groo~e and the wiper ring. The O-ring 3 also fits in a second groove 13 in the wiper ring 2. The wiper ring 2 touches the piston rod along two circular seal edges 7 and 7' spaced apart in the axial direction. The associated radial planes of the seal edges 7,7' are respectively indicated at 9,9'.
'! The second groove 13 forms a continuous supporting surface 8 - 20 that extends in the axial direction and beyond the radial planes 9,9' of the seal edges 7,7' and beyond the radial planes of any additional . seal edges if more than two are provided in any particular instance.
Each of the seal edges 7,7' is formed by a pair of conical surfaces ` which intersect one another, and where that conical surface proximate ; 25 to the sealed space subtends a greater angle w}th the axis of the machine part and seal than does the other surface of the pair. The seal edges form part of sealing lips 6,6' which are separated from one another in the axial direction by an intervening space 5.
~: In the embodiment shown in Figure 1, the support surface 8 is formed as an evenly curved surface. The radius of curvature is ~'~ some 2.5 times greater than the radius of curvature of the O-ring 3.
The support surface 8 extends to the axially outer surfaces 16,16' of ~ the wiper ring 2.
:
, ,; ,.... ~ , ::
" , .. :.:, ... : , . .
: : ,. . , :
2~31~7 ~.
The wiper ring, whose half section is shown in Figure 2, differs from the embodiment described above in that the support surface 8 is not as greatly curved in the region 10 between the radial I planes 9,9' of the seal edges 7,7' as in the zones 17,18 that lie axially outside the region 10. The support surface 8 can have a somewhat flattened profile within the region 10 and can optionally be cylindrically configured.
~ The embodiment shown in Figure 3 differs from those earlier :~ described in that the support surface 8 is so inclined that a tangent 11 in the axial direction between the radial planes 9,9' of the seal edges 7,7' subtends an acute angle A with the axis on the sealed space side 15 that does not exceed 5 to 20 (preferably 18).
In the embodiment shown, this angle is 18 and enables good sealing of fluid under considerable pressure in space 15 over long periods of : lS time.
,.~ !
~'''''''' .. . .
~','''.
~,' ~' :
. . . ' ; , ~ , , ". : ,: -- : ' : , ,`: :
Claims (10)
1. A seal for an elongated axially movable machine part extending from a space under pressure to be sealed comprising, a wiper ring supported in a first annular groove open in radially inward direction toward the movable machine part, an O-ring of rubber-elastic material, bearing against the wiper ring in a second groove formed in said wiper ring and abutting against a radially outer surface of the first groove, the wiper ring touching the relatively movable machine part along at least two circular seal edges spaced apart in axial direction of said machine part, the second groove opening axially outwardly in radial direction and defining a support surface for said O-ring on said wiper ring, the support surface axially overlapping radial planes intersecting the seal edges as a continuous surface.
2. A seal as defined in claim 1, the support surface having a curved profile in axial section.
3. A seal as defined in claim 2, the profile being regularly curved.
4. A seal as defined in claim 3, the profile having a radius of curvature greater than the radius of curvature of the O-ring in toral section.
5. A seal as defined in claim 4, the ratio of the radius of curvature of the profile to said radius of curvature of the O-ring being from 2:1 to 3:1.
6. A seal as defined in claim 1, 2, 3, 4 or 5, the support surface extending into an area adjacent axially outer surfaces of the wiper ring.
7. A seal as defined in claim 1, the support surface having a flattened profile in axial section, at least between the radial planes of the seal edges.
8. A seal as defined in claim 7, the flattened profile being cylindrical.
9. A seal as defined in claim 1, 2, 3, 4 or 5, wherein a tangent to the support surface in axial direction and between the radial planes of the seal edges subtends an acute angle with the axis, the side of said seal adjacent said space under pressure that is in the range of substantially 5° to 20°.
10. A seal as defined in claim 1, 2, 3, 4, or 5, the wiper ring being PTFE.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3940324A DE3940324A1 (en) | 1989-12-06 | 1989-12-06 | PISTON OR ROD SEAL |
| DEP3940324.6 | 1989-12-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2031557A1 true CA2031557A1 (en) | 1991-06-07 |
Family
ID=6394913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002031557A Abandoned CA2031557A1 (en) | 1989-12-06 | 1990-12-05 | Seal for elongated axially movable machine part |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0434908B1 (en) |
| JP (1) | JPH04102766A (en) |
| AT (1) | ATE97212T1 (en) |
| BR (1) | BR9006168A (en) |
| CA (1) | CA2031557A1 (en) |
| DE (2) | DE3940324A1 (en) |
| ES (1) | ES2046637T3 (en) |
| MX (1) | MX174037B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003526A (en) * | 2009-08-26 | 2011-04-06 | 通用汽车环球科技运作公司 | Actuation device having wiper seals for a dual clutch transmission |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19734497C2 (en) | 1997-08-08 | 1999-06-10 | Daimler Chrysler Ag | Sealing arrangement for sealing a piston rod |
| DE19739472A1 (en) * | 1997-09-09 | 1999-03-18 | Freudenberg Carl Fa | Sealing arrangement |
| US6450502B1 (en) | 1998-11-14 | 2002-09-17 | Ti Specialty Polymer Products, Inc. | Rotary seal with relief angle for controlled tipping |
| GB2372786B (en) * | 1998-11-14 | 2002-12-24 | Ti Specialty Polymer Products | Rotary seal |
| DE10054637C1 (en) * | 2000-11-03 | 2002-06-27 | Freudenberg Carl Kg | Seal, for a piston or rod, has a sliding ring within a structured groove pressed against the moving component by an O-ring to allow axial movement without radial distortion |
| CN103062407A (en) * | 2012-12-29 | 2013-04-24 | 太仓市明宇密封件有限公司 | Square coaxial sealing element |
| DE102015208773A1 (en) | 2015-05-12 | 2016-11-17 | Stasskol Gmbh | Wiper assembly and sealing device |
| CN109642675B (en) * | 2016-08-24 | 2021-03-19 | Nok株式会社 | Sealing device |
| AT521716B1 (en) * | 2018-09-20 | 2020-07-15 | Hoerbiger Wien Gmbh | Oil scraper ring for a piston rod |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3663024A (en) * | 1970-07-02 | 1972-05-16 | Shamban & Co W S | Sealing assembly |
| DE2222416C3 (en) * | 1972-05-06 | 1975-07-03 | Nabenfabrik Alfing Kessler Kg, 7083 Wasseralfingen | Sealing arrangement for the piston of a hydropneumatic accumulator |
| JPS5748694A (en) * | 1980-09-08 | 1982-03-20 | Tokyo Shibaura Electric Co | Atomic power plant |
| DE3320515C1 (en) * | 1983-06-07 | 1988-12-01 | Christensen, Inc., 84115 Salt Lake City, Utah | High pressure seal for parts of deep drilling tools that can be moved longitudinally against each other |
| JPS6014953A (en) * | 1983-07-06 | 1985-01-25 | Chiyouonpa Kk | Washing vibrating screen |
| DE3418898A1 (en) * | 1984-05-21 | 1985-11-21 | Alfred Teves Gmbh, 6000 Frankfurt | Seal arrangement |
| GB2177464B (en) * | 1985-06-29 | 1988-06-02 | Dowty Seals Ltd | Sealing assembly |
| DE3603669A1 (en) * | 1986-02-06 | 1987-08-13 | Busak & Luyken Gmbh & Co | DOUBLE SCRAPER ARRANGEMENT |
| DE3613880C1 (en) * | 1986-04-24 | 1987-07-02 | Busak & Luyken Gmbh & Co | Sealing arrangement |
| US4889351A (en) * | 1988-05-12 | 1989-12-26 | Frost Stanley A | Hydraulic seal |
-
1989
- 1989-12-06 DE DE3940324A patent/DE3940324A1/en not_active Withdrawn
-
1990
- 1990-09-13 DE DE90117646T patent/DE59003468D1/en not_active Expired - Lifetime
- 1990-09-13 EP EP90117646A patent/EP0434908B1/en not_active Expired - Lifetime
- 1990-09-13 ES ES199090117646T patent/ES2046637T3/en not_active Expired - Lifetime
- 1990-09-13 AT AT90117646T patent/ATE97212T1/en not_active IP Right Cessation
- 1990-12-05 BR BR909006168D patent/BR9006168A/en not_active IP Right Cessation
- 1990-12-05 MX MX023607A patent/MX174037B/en unknown
- 1990-12-05 CA CA002031557A patent/CA2031557A1/en not_active Abandoned
- 1990-12-06 JP JP2400640A patent/JPH04102766A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003526A (en) * | 2009-08-26 | 2011-04-06 | 通用汽车环球科技运作公司 | Actuation device having wiper seals for a dual clutch transmission |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0434908B1 (en) | 1993-11-10 |
| BR9006168A (en) | 1991-09-24 |
| DE59003468D1 (en) | 1993-12-16 |
| ES2046637T3 (en) | 1994-02-01 |
| ATE97212T1 (en) | 1993-11-15 |
| EP0434908A2 (en) | 1991-07-03 |
| EP0434908A3 (en) | 1991-10-23 |
| JPH04102766A (en) | 1992-04-03 |
| MX174037B (en) | 1994-04-15 |
| DE3940324A1 (en) | 1991-06-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |