GB2073845A - Improvements in and Relating to Piston Seals - Google Patents
Improvements in and Relating to Piston Seals Download PDFInfo
- Publication number
- GB2073845A GB2073845A GB8012087A GB8012087A GB2073845A GB 2073845 A GB2073845 A GB 2073845A GB 8012087 A GB8012087 A GB 8012087A GB 8012087 A GB8012087 A GB 8012087A GB 2073845 A GB2073845 A GB 2073845A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- seal
- cylinder
- sealing
- bearing
- 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.)
- Withdrawn
Links
- 238000007789 sealing Methods 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 7
- 229920003023 plastic Polymers 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 3
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Sealing Devices (AREA)
Abstract
A piston seal comprising an annular body portion (11), a skirt portion (12) extending axially from said body and having a substantially cylindrical external surface (16) for co- operation with the inner wall 17 of a cylinder 18, and a sealing flange portion (13) having an external sealing lip (22) extending from said body and biassed outwardly beyond the cylindrical surface (16) before mounting in the cylinder. The biassing is provided by a load unit 25 of plastics material or metal, the unit acting as a finger type spring. <IMAGE>
Description
SPECIFICATION
Improvements in and Relating to Piston Seals
This invention relates to a piston seal for use in such piston and cylinder devices as shock absorbers, hydraulic rams and suspension units.
A common sealing arrangement in such devices is made up of a rubber sealing ring with the piston acting as the bearing within the cylinder, while another arrangement uses a rubber sealing ring with a ring of plastics material let into the piston circumference to act as a bearing. Also some arramgements have a rubber ring with a further plastics ring set on the heel diameter both to act as a bearing ring and to prevent extrusion of the rubber under pressure.
It is an object of the present invention to provide a simple sealing/bearing arrangement for pistons.
The present invention is a piston seal comprising an annular body portion, a skirt portion extending axially from said body and having a substantially cylindrical external surface, and a sealing flange portion having an external sealing lip extending from the said body and biassed outwardly beyond the cylindrical surface.
The present invention is further a piston seal as defined in the last preceding paragraph in combination with a piston head.
The present invention is moreover a piston and cylinder device in which the piston head has mounted thereon a seal as defined in the second last preceding paragraph.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawing, in which the single figure is a partial cross-section through a seal according to the present invention in position on a piston head in the cylinder.
Referring now to the drawing, a seal 10 is annular and has a body portion 11, an annular skirt portion 12 and a sealing flange portion 13.
The body portion 11 seats in an annular step 1 4 in the piston head, and the skirt portion extends axially from the outer periphery of the body portion and sits on an external flange 1 5 on the piston head. The outer peripheral surface 1 6 of the skirt portion -12 forms a bearing surface in engagement with the interior wall 17 of a cylinder 1 8.
Peripheral grooves 20 are provided in the bearing surface to retain oil and distribute it over the cylinder wall 17.
The sealing flange portion 1 3 extends from the body portion and is provided with a sealing lip 22 in engagement with the cylinder wall 1 7. The sealing lip portion is biassed outwardly beyond the bearing surface 1 6 (the drawing shows its position before location in the cylinder) and this achieved, in this embodiment by means of a load unit 25 acting as a finger type spring. A piston cap 26 clamps the unit 25 onto the body portion 11 and step 14.
It should be noted that a peripheral well 30 is formed at the base of the sealing lip portion adjacent the bearing portion, this well assisting lubrication by acting as a reservoir.
it is preferred that the seal 10 be made of PTFE to give minimal friction characteristics, but it could be made of any of the well known rubber or elastomeric materials suitable for this purpose.
The load unit 25 may be made of plastics material or metal.
The load unit 25 may be dispensed with under certain conditions and the inition lip load obtained from sealing flange portion 13'.
Claims
1. A piston seal comprising annular body portion, a skirt portion extending axially from said body and having a substantially cylindrical external surface, and a sealing flange portion having an external sealing lip extending from said body and biassed outwardly beyond the cylindrical surface.
2. A piston seal as claimed in claim 1, including a load unit engaging said flange portion to bias it outwardly.
3. A piston seal as claimed in claim 1 or claim 2, and made of PTFE.
4. A piston seal as claimed in any preceding claim, in which one or more peripheral grooves are provided on the external surface of the skirt portion.
5. A piston seal substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
6. A piston seal as claimed in any preceding claim, in combination with a piston head.
7. A piston and cylinder device in which the piston head had mounted thereon a seal as claimed in any of claims 1 to 5.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A piston seal comprising annular body portion, a skirt portion extending axially from said body and having a substantially cylindrical external surface, and a sealing flange portion having an external sealing lip extending from said body and biassed outwardly beyond the cylindrical surface.
2. A piston seal as claimed in claim 1, including a load unit engaging said flange portion to bias it outwardly.
3. A piston seal as claimed in claim 1 or claim 2, and made of PTFE.
4. A piston seal as claimed in any preceding claim, in which one or more peripheral grooves are provided on the external surface of the skirt portion.
5. A piston seal substantially as hereinbefore described with reference to, and as shown in, the accompanying drawing.
6. A piston seal as claimed in any preceding claim, in combination with a piston head.
7. A piston and cylinder device in which the piston head had mounted thereon a seal as claimed in any of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8012087A GB2073845A (en) | 1980-04-11 | 1980-04-11 | Improvements in and Relating to Piston Seals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8012087A GB2073845A (en) | 1980-04-11 | 1980-04-11 | Improvements in and Relating to Piston Seals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2073845A true GB2073845A (en) | 1981-10-21 |
Family
ID=10512747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8012087A Withdrawn GB2073845A (en) | 1980-04-11 | 1980-04-11 | Improvements in and Relating to Piston Seals |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2073845A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2130338A (en) * | 1982-09-11 | 1984-05-31 | Erich Becker | Pendulum piston pump |
| US4566702A (en) * | 1985-03-18 | 1986-01-28 | W. S. Shamban & Company | Seal assembly with improved low pressure sealing ring |
| GB2162419A (en) * | 1984-07-30 | 1986-02-05 | Sanden Corp | Beverage brewing apparatus |
| DE3623928A1 (en) * | 1986-07-16 | 1988-01-21 | Wabco Westinghouse Steuerung | DEVICE FOR SEALING TWO RELATIVELY MOVABLE MACHINE PARTS, IN PARTICULAR TO SEAL THE PISTON OF A WORK CYLINDER |
| EP0347587A3 (en) * | 1988-06-24 | 1990-10-31 | Goetze Ag | Shaft sealing ring |
| US4986553A (en) * | 1986-10-06 | 1991-01-22 | George Angus & Company Limited | Shaft seal |
| DE4135867A1 (en) * | 1991-10-31 | 1993-05-06 | Alfred Teves Gmbh, 6000 Frankfurt, De | CUFF RETURN VALVE |
| US5522456A (en) * | 1994-06-22 | 1996-06-04 | Geiger Technic, Inc. | Overflow with threaded plastic fillneck for surge tanks and overflow reservoirs |
| DE102018107057A1 (en) * | 2017-12-20 | 2019-06-27 | ECO Holding 1 GmbH | Connecting rod for a variable compression internal combustion engine |
| DE102019114173A1 (en) * | 2019-01-08 | 2020-07-09 | ECO Holding 1 GmbH | Connecting rod of an internal combustion engine with variable compression |
| DE102019102888A1 (en) * | 2019-02-06 | 2020-08-06 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Adjustment arrangement for a connecting rod of a reciprocating piston internal combustion engine |
-
1980
- 1980-04-11 GB GB8012087A patent/GB2073845A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4540352A (en) * | 1982-09-11 | 1985-09-10 | Erich Becker | Pendular piston pump having a cup-shaped sealing element |
| GB2130338A (en) * | 1982-09-11 | 1984-05-31 | Erich Becker | Pendulum piston pump |
| GB2162419A (en) * | 1984-07-30 | 1986-02-05 | Sanden Corp | Beverage brewing apparatus |
| US4566702A (en) * | 1985-03-18 | 1986-01-28 | W. S. Shamban & Company | Seal assembly with improved low pressure sealing ring |
| DE3623928A1 (en) * | 1986-07-16 | 1988-01-21 | Wabco Westinghouse Steuerung | DEVICE FOR SEALING TWO RELATIVELY MOVABLE MACHINE PARTS, IN PARTICULAR TO SEAL THE PISTON OF A WORK CYLINDER |
| US4875405A (en) * | 1986-07-16 | 1989-10-24 | Wabco Westinghouse Steuerungstechnik Gmbh | Sealing device |
| US4986553A (en) * | 1986-10-06 | 1991-01-22 | George Angus & Company Limited | Shaft seal |
| EP0347587A3 (en) * | 1988-06-24 | 1990-10-31 | Goetze Ag | Shaft sealing ring |
| DE4135867A1 (en) * | 1991-10-31 | 1993-05-06 | Alfred Teves Gmbh, 6000 Frankfurt, De | CUFF RETURN VALVE |
| US5522456A (en) * | 1994-06-22 | 1996-06-04 | Geiger Technic, Inc. | Overflow with threaded plastic fillneck for surge tanks and overflow reservoirs |
| DE102018107057A1 (en) * | 2017-12-20 | 2019-06-27 | ECO Holding 1 GmbH | Connecting rod for a variable compression internal combustion engine |
| DE102019114173A1 (en) * | 2019-01-08 | 2020-07-09 | ECO Holding 1 GmbH | Connecting rod of an internal combustion engine with variable compression |
| DE102019102888A1 (en) * | 2019-02-06 | 2020-08-06 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Adjustment arrangement for a connecting rod of a reciprocating piston internal combustion engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |