EP0898056B1 - Seal for machine parts reciprocating relatively to one another - Google Patents

Seal for machine parts reciprocating relatively to one another Download PDF

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Publication number
EP0898056B1
EP0898056B1 EP98115062A EP98115062A EP0898056B1 EP 0898056 B1 EP0898056 B1 EP 0898056B1 EP 98115062 A EP98115062 A EP 98115062A EP 98115062 A EP98115062 A EP 98115062A EP 0898056 B1 EP0898056 B1 EP 0898056B1
Authority
EP
European Patent Office
Prior art keywords
seal
valve stem
retaining part
sealing lip
seal according
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.)
Expired - Lifetime
Application number
EP98115062A
Other languages
German (de)
French (fr)
Other versions
EP0898056A3 (en
EP0898056A2 (en
Inventor
Jürgen Netzer
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.)
CR Elastomere GmbH
Original Assignee
CR Elastomere GmbH
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
Application filed by CR Elastomere GmbH filed Critical CR Elastomere GmbH
Publication of EP0898056A2 publication Critical patent/EP0898056A2/en
Publication of EP0898056A3 publication Critical patent/EP0898056A3/en
Application granted granted Critical
Publication of EP0898056B1 publication Critical patent/EP0898056B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/08—Valves guides; Sealing of valve stem, e.g. sealing by lubricant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/909—Similar sealing structures for mounting on piston and about rod

Definitions

  • the present invention relates to a seal for back and forth machine parts, especially valve stem seals, according to Preamble of claim 1.
  • a valve stem seal which consists of a There is a sealing ring, which is attached to the valve stem guide via a sleeve-shaped holding part is attached.
  • the sleeve-shaped holding part faces the one facing away from the sealing ring End a double folded flange to support the valve spring, whereby a plurality of tabs on the radially inner free end of the lowermost flange part engage in an annular groove.
  • This known holding part has a complicated one Structure and is therefore difficult to manufacture.
  • the tabs are on Provided end of the holding part, so that the holding part with relatively short seats can easily go wrong.
  • the present invention has therefore set itself the task of a Create a seal with a simple and inexpensive holding part that is secure and perfect attachment and centering guaranteed.
  • the projection for axially fixing the seal is after another Feature of the invention in the central region of the axially projecting section of the Holding element provided so that there is also a larger ring area guided support results, whereby misalignments are avoided.
  • the recess corresponding to the projection in the second machine part becomes expediently designed as an annular groove. This is an alignment in Circumferential direction not required.
  • Such a slot can also in the protruding sleeve section of the holding part be provided, on the one hand, the sliding of the holding part onto the machine part to facilitate and on the other hand to achieve a pressure of the holding part.
  • Another feature of Invention of the holding part at the end of the protruding sleeve section be expanded to the outside in a trumpet shape.
  • the holding part can be made of sheet steel or of another material, e.g. be made of a tough plastic.
  • a production of the holding part Plastic has the advantage that it can be used in a 2-component injection molding machine can be completely manufactured together with the sealing lip.
  • the invention can be advantageously used in particular for valve stem seals use. However, other applications are also conceivable.
  • the valve stem seal consists of a sealing lip 1, which is under radial prestress sealing back and forth on the outer surface 2 of a valve stem guide 3 Movable valve stem 4 is present.
  • the sealing lip 1 is on a sleeve-shaped Holding part 5 by injection, pouring, vulcanization or the like. Attached. From Sealing lip 1 and holding part 5 existing unit is with an axially protruding Sleeve section 6 is pushed onto the outer surface 7 of the valve stem guide 3 and is by at least one radially inward from the central region of the sleeve section 6 of the holding part 5 notched projection 8, which in a corresponding annular groove 9 in the Shell surface 7 of the valve stem guide 3 engages, fixed in the axial direction.
  • the radial preload of the sealing lip 1 is drawn in by the radially inward Section 10 of the holding part 5 exercised.
  • a To provide a ring spring for exerting a preload One more way consists in the one in the section 10 carrying the sealing lip in the axial direction provided slots (not shown).
  • the sealing lip 1 is on the Face 11 of the valve stem guide 3 facing end with an axially projecting, provided annular sealing lip 12 which bears against the end face 11 under prestress and so forms a static seal.
  • the protruding sleeve section 6 of the holding part 5 can also have one or more axially extending slots (not shown) may be provided.

Description

Die vorliegende Erfindung betrifft eine Abdichtung für relativ zueinander hin- und hergehende Maschinenteile, insbesondere Ventilschaftabdichtung, nach dem Oberbegriff des Anspruches 1.The present invention relates to a seal for back and forth machine parts, especially valve stem seals, according to Preamble of claim 1.

Durch die EP-0 392 893 A1 ist eine Ventilschaftabdichtung bekannt, die aus einem Dichtring besteht, der über ein hülsenförmiges Halteteil an der Ventilschaftführung befestigt ist. Das hülsenförmige Halteteil weist an dem dem Dichtring abgewandten Ende einen doppelt gefalzten Flansch zur Abstützung der Ventilfeder auf, wobei eine Vielzahl von Laschen am radial inneren freien Ende des untersten Flanschteiles in eine Ringnut eingreifen. Dieses bekannte Halteteil hat einen komplizierten Aufbau und ist deshalb auch schwierig zu fertigen. Außerdem sind die Laschen am Ende des Halteteiles vorgesehen, so dass bei relativ kurzen Sitzflächen das Halteteil sich leicht schiefstellen kann.From EP-0 392 893 A1 a valve stem seal is known which consists of a There is a sealing ring, which is attached to the valve stem guide via a sleeve-shaped holding part is attached. The sleeve-shaped holding part faces the one facing away from the sealing ring End a double folded flange to support the valve spring, whereby a plurality of tabs on the radially inner free end of the lowermost flange part engage in an annular groove. This known holding part has a complicated one Structure and is therefore difficult to manufacture. In addition, the tabs are on Provided end of the holding part, so that the holding part with relatively short seats can easily go wrong.

Ähnliche Ausgestaltungen einer Ventilschaftabdichtung sind aus der US 4,773,363, der US 4,909,202, der GB 1 078 586 und der GB 1 170 405 bekannt.Similar configurations of a valve stem seal are known from US Pat. No. 4,773,363, US 4,909,202, GB 1 078 586 and GB 1 170 405.

Die vorliegende Erfindung hat es sich deshalb zur Aufgabe gemacht, eine Abdichtung mit einem einfachen und billigen Halteteil zu schaffen, der eine sichere und einwandfreie Befestigung und Zentrierung gewährleistet. The present invention has therefore set itself the task of a Create a seal with a simple and inexpensive holding part that is secure and perfect attachment and centering guaranteed.

Dies wird nach der vorliegenden Erfindung durch die im kennzeichnenden Teil des Anspruches 1 enthaltenen Merkmale erreicht.This is according to the present invention by the in the characterizing part of Claim 1 features achieved.

Durch den schräg nach innen gerichteten Vorsprung, der in eine Ausnehmung in der Mantelfläche des zweiten Maschinenteils eingreift, erfolgt eine sichere formschlüssige Befestigung des Halteteils und damit der Dichtung selbst am Maschinenteil. Auch ist eine einwandfreie Zentrierung der Abdichtung gegenüber dem Maschinenteil gewährleistet. Der Vorsprung ist in einfacher Weise durch Ausklinken aus dem zylindrischen Abschnitt des Halteteils erzeugt.Due to the obliquely inward projection, which in a recess in the The outer surface of the second machine part engages, there is a safe positive fastening of the holding part and thus the seal itself on Machine part. A perfect centering of the seal is also opposite the machine part guaranteed. The lead is easily through Notching generated from the cylindrical portion of the holding part.

Der Vorsprung zur axialen Fixierung der Abdichtung ist dabei nach einem weiteren Merkmal der Erfindung im Mittelbereich des axial überstehenden Abschnitts des Halteelementes vorgesehen, so dass sich auch eine über eine größere Ringfläche geführte Abstützung ergibt, wodurch Schiefstellungen vermieden werden.The projection for axially fixing the seal is after another Feature of the invention in the central region of the axially projecting section of the Holding element provided so that there is also a larger ring area guided support results, whereby misalignments are avoided.

Die dem Vorsprung entsprechende Ausnehmung im zweiten Maschinenteil wird zweckmäßigerweise als Ringnut ausgebildet. Auf diese Weise ist ein Ausrichten in Umfangsrichtung nicht erforderlich.The recess corresponding to the projection in the second machine part becomes expediently designed as an annular groove. This is an alignment in Circumferential direction not required.

Für eine weichere Einstellung der Radialkraftkennlinie der Dichtlippe kann nach einem weiteren Merkmal der Erfindung der Halteteil im die Dichtlippe tragenden Abschnitt mit mindestens einem in Axialrichtung verlaufenden Schlitz versehen sein. Ein solcher Schlitz kann auch im überstehenden Hülsenabschnitt des Halteteils vorgesehen sein, um einerseits das Aufschieben des Halteteils auf das Maschinenteil zu erleichtern und andererseits eine Anpressung des Halteteils zu erreichen.For a softer setting of the radial force characteristic of the sealing lip, a further feature of the invention of the holding part in the sealing lip carrying Provide section with at least one slot running in the axial direction his. Such a slot can also in the protruding sleeve section of the holding part be provided, on the one hand, the sliding of the holding part onto the machine part to facilitate and on the other hand to achieve a pressure of the holding part.

Zur Erleichterung des Aufschiebens kann nach einem weiteren Merkmal der Erfindung der Halteteil am Ende des überstehenden Hülsenabschnittes trompetenförmig nach außen aufgeweitet sein. To facilitate postponement, another feature of Invention of the holding part at the end of the protruding sleeve section be expanded to the outside in a trumpet shape.

Der Halteteil kann aus Stahlblech oder auch aus einem anderen Material, wie z.B. einem zähharten Kunststoff hergestellt sein. Eine Fertigung des Halteteils aus Kunststoff hat den Vorteil, dass er in einer 2-Komponenten Spritzgießmaschine zusammen mit der Dichtlippe vollständig gefertigt werden kann. The holding part can be made of sheet steel or of another material, e.g. be made of a tough plastic. A production of the holding part Plastic has the advantage that it can be used in a 2-component injection molding machine can be completely manufactured together with the sealing lip.

Die Erfindung läßt sich in vorteilhafter Weise insbesondere für Ventilschaftabdichtungen verwenden. Es sind jedoch auch andere Anwendungsfälle denkbar.The invention can be advantageously used in particular for valve stem seals use. However, other applications are also conceivable.

Ein Ausführungsbeispiel der Erfindung soll nachstehend anhand der in der beigefügten Zeichnung im Längsschnitt dargestellten Ventilschaftabdichtung näher beschrieben werden.An embodiment of the invention will now be described with reference to that in the accompanying Drawing shown in longitudinal section valve stem seal are described in more detail.

Die Ventilschaftabdichtung besteht aus einer Dichtlippe 1, die unter radialer Vorspannung abdichtend an der Mantelfläche 2 eines gegenüber der Ventilschaftführung 3 hin- und herbewegbaren Ventilschaftes 4 anliegt. Die Dichtlippe 1 ist an einem hülsenförmigen Halteteil 5 durch Anspritzen, Angießen, Anvulkanisieren oder dgl. befestigt. Die aus Dichtlippe 1 und Halteteil 5 bestehende Einheit ist mit einem axial überstehenden Hülsenabschnitt 6 auf die Mantelfläche 7 der Ventilschaftführung 3 aufgeschoben und wird durch mindestens einen, radial nach innen aus dem Mittelbereich des Hülsenabschnittes 6 des Halteteiles 5 ausgeklinkten Vorsprung 8, der in eine entsprechende Ringnut 9 in der Mantelfläche 7 der Ventilschaftführung 3 eingreift, in axialer Richtung fixiert.The valve stem seal consists of a sealing lip 1, which is under radial prestress sealing back and forth on the outer surface 2 of a valve stem guide 3 Movable valve stem 4 is present. The sealing lip 1 is on a sleeve-shaped Holding part 5 by injection, pouring, vulcanization or the like. Attached. From Sealing lip 1 and holding part 5 existing unit is with an axially protruding Sleeve section 6 is pushed onto the outer surface 7 of the valve stem guide 3 and is by at least one radially inward from the central region of the sleeve section 6 of the holding part 5 notched projection 8, which in a corresponding annular groove 9 in the Shell surface 7 of the valve stem guide 3 engages, fixed in the axial direction.

Die radiale Vorspannung der Dichtlippe 1 wird durch den radial nach innen eingezogenen Abschnitt 10 des Halteteiles 5 ausgeübt. Es ist jedoch auch möglich, wie bekannt, eine Ringfeder zur Ausübung einer Vorspannkraft vorzusehen. Eine weitere Möglichkeit besteht darin, im die Dichtlippe tragenden Abschnitt 10 eine oder mehrere in Axialrichtung verlaufende (nicht dargestellte) Schlitze vorzusehen. Die Dichtlippe 1 ist an dem der Stirnseite 11 der Ventilschaftführung 3 zugewandten Ende mit einer axial vorstehenden, ringförmigen Dichtlippe 12 versehen, die unter Vorspannung an der Stirnseite 11 anliegt und so eine statische Dichtung bildet.The radial preload of the sealing lip 1 is drawn in by the radially inward Section 10 of the holding part 5 exercised. However, as is known, it is also possible to use a To provide a ring spring for exerting a preload. One more way consists in the one in the section 10 carrying the sealing lip in the axial direction provided slots (not shown). The sealing lip 1 is on the Face 11 of the valve stem guide 3 facing end with an axially projecting, provided annular sealing lip 12 which bears against the end face 11 under prestress and so forms a static seal.

Auch der überstehende Hülsenabschnitt 6 des Halteteiles 5 kann mit einem oder mehreren axial verlaufenden Schlitzen (nicht dargestellt) versehen sein.The protruding sleeve section 6 of the holding part 5 can also have one or more axially extending slots (not shown) may be provided.

Schließlich ist es möglich, das freie Ende des Hülsenabschnittes 6 trompetenförmig zu erweitern (siehe strichpunktierte Linien), um das axiale Aufschieben des Halteteiles auf die Ventilführung 3 zu erleichtern, ohne daß diese mit einer Einführschräge versehen sein muß.Finally, it is possible to trumpet-shaped the free end of the sleeve portion 6 expand (see dash-dotted lines) to axially push the holding part onto the To facilitate valve guide 3, without this having to be provided with an insertion slope.

Claims (8)

  1. A seal for reciprocating machine parts, in particular a valve stem seal, comprising a sealing lip of elastomer applied under radial spring preloading against one machine part and a sleeve-like retaining part which carries the sealing lip and which projects axially over the sealing lip and at the same time serves to fasten the seal on the second machine part, characterised in that, in the projecting portion (6), the retaining part (5) is provided with at least one substantially obliquely inwardly directed projection (8) which engages in a recess (9) in the circumferential surface (7) of the second machine part (3), wherein the projection (8) in the retaining part (5) is formed by a portion of material disengaged from the projecting portion (6).
  2. A seal according to Claim 1, characterised in that the inwardly directed projection (8) is provided in the central region between the sealing lip (1) and the end of the retaining part (5) remote from the sealing lip (1).
  3. A valve stem seal according to Claim 1 or 2, characterised in that the recess in the circumferential surface (7) of the second machine part (3) is in the form of an annular groove (9).
  4. A seal according to any one of Claims 1 to 3, characterised in that, in the vicinity of the portion (10) carrying the sealing lip (1), the retaining part (5) is provided with at least one slot extending in the axial direction.
  5. A seal according to any one of Claims 1 to 4, characterised in that, in the projecting sleeve portion (6), the retaining part (5) is provided with at least one slot extending in the axial direction.
  6. A seal according to any one of Claims 1 to 5, characterised in that, at the end of the projecting sleeve portion (6), the retaining part (5) is flared outwards in trumpet-like manner.
  7. A seal according to any one of Claims 1 to 6, characterised in that the retaining part (5) is made from a plastics material.
  8. A seal according to any one of Claims 1 to 7 for use as a valve stem seal, wherein the first machine parts is in the form of a valve stem (4) and the second machine parts is in the form of a valve stem guide (3), characterised in that the recess (9) is arranged to receive the projection (8) of the retaining part (5) in the valve stem guide (3).
EP98115062A 1997-08-21 1998-08-11 Seal for machine parts reciprocating relatively to one another Expired - Lifetime EP0898056B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19736321A DE19736321A1 (en) 1997-08-21 1997-08-21 Sealing for machine parts that reciprocate relative to each other
DE19736321 1997-08-21

Publications (3)

Publication Number Publication Date
EP0898056A2 EP0898056A2 (en) 1999-02-24
EP0898056A3 EP0898056A3 (en) 1999-03-24
EP0898056B1 true EP0898056B1 (en) 2002-11-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98115062A Expired - Lifetime EP0898056B1 (en) 1997-08-21 1998-08-11 Seal for machine parts reciprocating relatively to one another

Country Status (3)

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US (1) US6227548B1 (en)
EP (1) EP0898056B1 (en)
DE (2) DE19736321A1 (en)

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GB9806543D0 (en) * 1998-03-26 1998-05-27 Lucas Ind Plc Disc brake seal assembly
US6422569B1 (en) * 1999-11-30 2002-07-23 Parker-Hannifin Corporation Snap-in retainer for a fluid seal
US6609700B2 (en) * 2001-05-31 2003-08-26 Dana Corporation Valve seal assembly with spring finger retainer
DE10207818B4 (en) * 2002-02-25 2006-04-06 Carl Freudenberg Kg Valve stem seal on internal combustion engines
US6764079B1 (en) 2002-04-19 2004-07-20 Dana Corporation Valve seal assembly with straight-walled retainer
US7025030B2 (en) * 2003-08-21 2006-04-11 Dana Corporation Valve stem seal assembly with changeable cap
US20050147933A1 (en) * 2003-12-31 2005-07-07 Eastman Kodak Company Color motion picture print film
US7900932B2 (en) * 2004-08-03 2011-03-08 Dana Automotive Systems Group, Llc Valve stem sealing assembly
DE102010025986A1 (en) * 2010-07-02 2012-01-05 Handtmann Systemtechnik Gmbh & Co. Kg Charging device e.g. scroll type supercharger for internal combustion engine, has rotary shaft seal that includes ring housing and seat, where ring housing and outer portion of seat are partially formed with same light metal
US9371749B2 (en) 2012-02-08 2016-06-21 Dana Automotive Systems Group, Llc Hybrid valve stem seal retainer assembly
ITTO20131018A1 (en) * 2013-12-13 2015-06-14 Corcos Ind S A S Di Extern A Italia S R L GASKET FOR A SINGLE COMBUSTION ENGINE VALVE
US10508570B2 (en) * 2014-01-22 2019-12-17 Nok Corporation Valve stem seal
US9943935B2 (en) 2016-04-08 2018-04-17 Dana Automotive Systems Group, Llc Method of making a valve stem seal with formable retainer tabs
US10072539B2 (en) 2017-01-20 2018-09-11 Dana Automotive Systems Group, Llc Valve stem seal assembly with a symmetrical retainer
EP3757431A4 (en) * 2018-02-19 2021-03-31 NOK Corporation Hermetic sealing device and method for manufacturing same

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DE1899655U (en) * 1963-08-13 1964-08-27 Goetzewerke VALVE STEM SEAL, IN PARTICULAR FOR COMBUSTION MACHINERY.
SE320226B (en) * 1965-06-14 1970-02-02 Dana Corp
US3554562A (en) * 1967-06-21 1971-01-12 Gen Motors Corp Valve stem seal assembly
DE2444792A1 (en) * 1974-09-19 1976-04-08 Goetzewerke LIP SEAL RING, IN PARTICULAR FOR VALVE STEM GUIDES
US4773363A (en) * 1987-05-01 1988-09-27 Microdot Inc. Fixed valve stem oil deflector
US4811703A (en) * 1988-03-14 1989-03-14 Microdot Inc. Valve stem seal
FR2645937B1 (en) * 1989-04-12 1991-08-30 Peugeot DEVICE FOR GUIDING AND SEALING A VALVE
US4947811A (en) * 1989-06-30 1990-08-14 Dana Corporation Floating valve stem seal
US4909202A (en) * 1989-06-30 1990-03-20 Dana Corporation Frustoconical valve stem sealing element

Also Published As

Publication number Publication date
DE19736321A1 (en) 1999-03-11
DE59806411D1 (en) 2003-01-09
EP0898056A3 (en) 1999-03-24
EP0898056A2 (en) 1999-02-24
US6227548B1 (en) 2001-05-08

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