EP0801715A1 - Joint d'etancheite - Google Patents

Joint d'etancheite

Info

Publication number
EP0801715A1
EP0801715A1 EP96901570A EP96901570A EP0801715A1 EP 0801715 A1 EP0801715 A1 EP 0801715A1 EP 96901570 A EP96901570 A EP 96901570A EP 96901570 A EP96901570 A EP 96901570A EP 0801715 A1 EP0801715 A1 EP 0801715A1
Authority
EP
European Patent Office
Prior art keywords
sealing ring
sliding surface
ring according
sliding
separating
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Withdrawn
Application number
EP96901570A
Other languages
German (de)
English (en)
Inventor
Dieter Meller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
POLYPENCO KUNSTSTOFFTECHNIK GmbH
Koninklijke DSM NV
Original Assignee
POLYPENCO KUNSTSTOFFTECHNIK GmbH
DSM NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE19544513A external-priority patent/DE19544513A1/de
Application filed by POLYPENCO KUNSTSTOFFTECHNIK GmbH, DSM NV filed Critical POLYPENCO KUNSTSTOFFTECHNIK GmbH
Publication of EP0801715A1 publication Critical patent/EP0801715A1/fr
Withdrawn legal-status Critical Current

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
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/14—Joint-closures

Definitions

  • the invention relates to a sealing ring made of plastic, having a separating through-cut, and also a step-shaped overlap which is provided in the separating region and in which the mutually overlapping ring ends lie against each other in a sliding surface.
  • the said sealing rings made of plastic are used, for example, for the sealing of a shaft or spindle shoulder from a bore in, for example, automatic transmissions, servo units for power-assisted steering, brake boosters, retarders and the like and have a particularly influential effect on the quality of the performance which these components can achieve-
  • the step-shaped separating region is provided with two radially running sliding regions lying against each other. These sliding regions form the sealing surface in the installed state.
  • sealing rings in the form of a semi-finished product, after production of the semi-finished product, by for example sintering and/or pressing, to work them further in an additional machining production step, for example to grind them, until the dimensions of the final sealing ring are achieved within the tolerance, the dimensions continually having to be measured.
  • the invention is therefore based on the object of further developing the known sealing rings in such a way that they can be produced more easily and therefore at lower cost. According to the invention, this object is achieved by the sliding plane of the sealing ring being offset by an angle with respect to the perpendicular to the plane taken through the neutral axis.
  • the sliding surface produced by the step cut consequently forms an area of the lateral surface of a truncated cone.
  • the configuration of the step cut according to the invention achieves the effect that the seal can be produced in wider tolerances and nevertheless can be used in operation directly after production, by for example sintering and/or pressing, without an additional production step.
  • a further advantage is that the configuration of the step cut according to the invention achieves the effect that a tightness is ensured in the cut region even if the ambient medium enclosing the sealing ring, for example oil, is not at the usual operating temperature.
  • the sealing ring according to the invention can be made from plastics which cannot be used for the production of the known sealing ring, because the plastics are not suitable or not very suitable for the production of mouldings which are dimensionally very accurate. Incidentally, such plastics may have very favourable other properties or be inexpensive.
  • US 615902 discloses a sealing ring with a separating cut like the sealing ring according to the invention, the sealing ring is not produced from plastic, and it is also not disclosed by US 615902 that the sealing ring can be produced from plastic in the advantageous way. Furthermore, in the very long period of time in which the sealing ring from US 615902 was known, no-one had the idea of producing the sealing ring from plastic, without subsequent working.
  • the sealing ring according to the invention may be provided with a rectangular, square, round or other suitable cross-section.
  • the cross-sections of the mutually overlapping ring ends at both sides of the sliding surface are congruent taken along the separating region, as they are separated by the sliding surface.
  • the sliding surface can run under an angle with respect to the diagonal and preferably runs parallel to the diagonal of the sealing ring cross-section.
  • the sliding surface is laterally offset parallel to the diagonal of the sealing ring cross-section, so that the sealing ring cross-section is divided by the cut into a triangle and a pentagon with two additional edges. Preferably, this distance from the diagonal is about 20%.
  • the two edges bear against the bore or the shoulder such that they have the effect of achieving a sealing of the sliding surface in a wide tolerance range of the sealing ring, even in the event that the ambient medium is not at its normal operating temperature.
  • the enlarged edges have the effect of reducing the risk of material abrasion by the ambient medium flowing around, caused by cavitations.
  • the sliding surface preferably forms a single plane, so in the cross-section of the ring in the separating region the intersecting line of the cross section and the sliding surface is a straight line.
  • the sliding surface is otherwise formed, the intersecting line not being a straight line, but being bended or even running stepwise.
  • the plane section running between the two intersecting lines of the sliding surface and the outside surfaces of the ring body forms an area of the lateral surface of a truncated cone.
  • the sealing ring is installed in such a way that the sliding surface is arranged offset to the side away from the pressure.
  • the sealing ring comprises two sliding surfaces, the sliding surfaces being positioned in an angle with respect to one another.
  • An advantage of such a sealing ring is that no matter how the ring is installed always one of the two sliding surfaces is arranged offset to the side away from the pressure.
  • the ring comprising the two sliding surfaces is having a rectangular or square cross-section, the sliding surfaces both have an intersecting line with one outside surface of the ring body, the outside surface being parallel to the plane taken through the neutral axis and one sliding surface is having an intersecting line with one outside surface of the ring body perpendicular to the plane taken, through the neutral axis and the other sliding surface is having an intersecting line with the other outerside surface of the ring body the outside surface being perpendicular to the plane taken through the neutral axis.
  • plastics which are well suited for sliding applications are preferably used. Apart from the good sliding friction values, these plastics have a high wear resistance and temperature resistance.
  • the plastic polytetrafluoroethylene is used for production.
  • This plastic may be modified with synthetic mica to improve the pressure resistance and abrasion resistance and to reduce the thermal expansion.
  • PTFE has the properties of extreme chemical resistance and low friction values. The mica does not attack the materials sliding on each other.
  • a poly(amide-imide) which has a high strength and can be used in the temperature range from -190°C to 260°C, is used as the plastic.
  • PTFE and graphite additives can improve the sliding/abrasion behaviour.
  • the extremely low coefficient of thermal expansion has the result that there is virtually no longer any difference from metallic materials.
  • the sealing rings there can likewise be used the plastic polyetherether ketone, which has unique serviceability and high flexural fatigue strength.
  • polyetherether ketones have long-term heat resistance at 250°C, have good chemical resistance and can be used even in hot water, steam and under a high vacuum.
  • plastics are polyphenylene sulphide (PPS) and polyaryl ether ketone (PAEK).
  • the sealing ring according to the invention may also be designed in its separating region as a hook-lock ring.
  • the sealing ring is preferably produced by injection moulding, without any additional machining production step. It is preferred to locate the sprue on the inside diameter of the ring.
  • the injection-moulding process is known to a person skilled in the art. The invention is illustrated by way of example in the drawing and is described in detail below with reference to the drawing, in which: Fig. 1 shows a plan view of the sealing ring according to the invention.
  • Fig. 2 shows a section along the line II-II from
  • Fig. 1 shows a section along the line III-III from
  • Fig. 1 and Fig. 4 shows an installation example of the sealing ring according to the invention in the detail of an automatic transmission.
  • Fig. 5a show crosssections of the sealing ring 5b, 5c according to the invention in the separating region having different kinds of sliding surfaces.
  • Fig. 6a show cross-sections of sealing rings 6b, 6c according to the invention in teh separating region having two sliding surfaces being positioned in an angle with respect to one other.
  • the sealing ring 1 comprises an annular element 2 having a radial slit 3.
  • the ends 4, 5 of the sealing ring lying opposite each other are configured as sliding surfaces 6, 7.
  • the sliding surface in the preferred embodiment of the invention is offset parallel to the diagonal of the sealing ring cross-section at a distance from the latter. In this way there are produced two additional edges 8 and 9 at the sliding surface 6.
  • the sealing ring according to the invention can also be used in other areas in which shafts/spindles have to be sealed with respect to housing bores, such as for example if the shaft/spindle is provided with a groove in which the sealing ring is arranged.
  • Fig. 5a shows the cross-section in the separating region of a sealing ring according to the invention having a sliding surface (represented by intersecting line 3) running stepwise.
  • the sliding surface is separating two mutually overlapping ring ends 1 and 2.
  • Fig. 5b shows a cross-section of a sealing ring according to the invention the sliding surface being bended.
  • the sliding surface is running stepwise in a single step.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un joint d'étanchéité (1) en plastique. Le joint d'étanchéité est pourvu d'une partie coupée traversante permettant une séparation. La partie coupée comprend un épaulement au niveau duquel les extrémités du joint se chevauchent en étant en contact mutuel au niveau d'une surface de glissement. La surface de glissement est réalisée de manière à être décalée d'un angle par rapport à la perpendiculaire au plan passant par l'axe neutre. De préférence, la surface coulissante est parallèle à la diagonale de la section transversale du joint d'étanchéité annulaire et elle est déplacée latéralement par rapport à cette diagonale. De cette manière, on forme deux bords aditionnels (8, 9) qui assurent l'étanchéité même quand le milieu environnant le joint d'étanchéité n'est pas à la température de fonctionnement usuelle. De cette manière, l'étanchéité du joint est améliorée davantage.
EP96901570A 1995-01-04 1996-01-02 Joint d'etancheite Withdrawn EP0801715A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19500092 1995-01-04
DE19500092 1995-01-04
DE19544513 1995-11-29
DE19544513A DE19544513A1 (de) 1995-01-04 1995-11-29 Dichtring
PCT/NL1996/000005 WO1996021116A1 (fr) 1995-01-04 1996-01-02 Joint d'etancheite

Publications (1)

Publication Number Publication Date
EP0801715A1 true EP0801715A1 (fr) 1997-10-22

Family

ID=26011441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96901570A Withdrawn EP0801715A1 (fr) 1995-01-04 1996-01-02 Joint d'etancheite

Country Status (3)

Country Link
EP (1) EP0801715A1 (fr)
AU (1) AU4590596A (fr)
WO (1) WO1996021116A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104821462A (zh) * 2015-04-17 2015-08-05 中航光电科技股份有限公司 密封圈及使用该密封圈的密封组件和电缆连接器

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120112415A1 (en) * 2010-11-10 2012-05-10 United Technologies Corporation Rotating seal ring with targeted split surface orientation
US9995397B2 (en) 2016-07-12 2018-06-12 United Technologies Corporation Coated seal housing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR762862A (fr) * 1933-10-24 1934-04-19 Perfectionnements aux segments d'étanchéité pour pistons
FR2343936A1 (fr) * 1976-03-08 1977-10-07 Merle Des Isles Jean Perfectionnement de la coupe d'un segment pour augmenter et prolonger son etancheite
US4251083A (en) * 1979-05-15 1981-02-17 Adriel Montes Piston ring with tongue and groove joint
JPH0752448Y2 (ja) * 1989-06-15 1995-11-29 株式会社リケン 低差圧流体用シール装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9621116A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104821462A (zh) * 2015-04-17 2015-08-05 中航光电科技股份有限公司 密封圈及使用该密封圈的密封组件和电缆连接器

Also Published As

Publication number Publication date
WO1996021116A1 (fr) 1996-07-11
AU4590596A (en) 1996-07-24

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19970623

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Effective date: 19990803