EP0898056A2 - 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
EP0898056A2
EP0898056A2 EP98115062A EP98115062A EP0898056A2 EP 0898056 A2 EP0898056 A2 EP 0898056A2 EP 98115062 A EP98115062 A EP 98115062A EP 98115062 A EP98115062 A EP 98115062A EP 0898056 A2 EP0898056 A2 EP 0898056A2
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EP
European Patent Office
Prior art keywords
holding part
seal
sealing
sealing lip
section
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.)
Granted
Application number
EP98115062A
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German (de)
French (fr)
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EP0898056B1 (en
EP0898056A3 (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
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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.)
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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 the generic term 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 has at the end facing away from the sealing ring a double crimped flange to support the valve spring, with a variety of tabs at the radially inner free end of the lowermost flange part in an annular groove intervention.
  • This known holding part has a complicated structure and is therefore also difficult to manufacture.
  • the tabs are provided at the end of the holding part, so that with relatively short seats, the holding part can easily crooked.
  • the present invention has therefore set itself the task of having a seal to create a simple and cheap holding part that is safe and flawless Fastening 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 Support results, whereby misalignments are avoided.
  • the protrusion can easily be can be generated by notching out the cylindrical portion of the holding part.
  • the corresponding recess in the second machine part is advantageously used as Ring groove formed. In this way, circumferential alignment is not required.
  • the holding part in the section carrying the sealing lip be provided with at least one slot running in the axial direction.
  • a slit can also be provided in the protruding sleeve section of the holding part, on the one hand to facilitate pushing the holding part onto the machine part and on the other hand one To achieve pressure on the holding part.
  • the Holding part at the end of the protruding sleeve section trumpet-shaped to the outside be widened.
  • the holding part can be made of sheet steel or of another material, e.g. one tough hard plastic and the projections not only by notching but also by Emboss or cast on or injection molded.
  • a production of the holding part Plastic has the advantage that it is combined in a 2-component injection molding machine can be completely manufactured 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.

Abstract

The seal consists of an shell-shaped holding part (5) holding the elastomer sealing lip (1), held under radial spring pressure against one of the machine parts. It projects axially above the sealing lip and serves to fix the seal to the second part (3). In its projecting sector (6), the holding part has at least one inward-angled projection (8) which engages in a recess (9) in the surface of the second part.

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 the generic term 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 has at the end facing away from the sealing ring a double crimped flange to support the valve spring, with a variety of tabs at the radially inner free end of the lowermost flange part in an annular groove intervention. This known holding part has a complicated structure and is therefore also difficult to manufacture. In addition, the tabs are provided at the end of the holding part, so that with relatively short seats, the holding part can easily crooked.

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 having a seal to create a simple and cheap holding part that is safe and flawless Fastening 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.Due to the obliquely inward projection, which in a recess in the If the outer surface of the second machine part engages, a secure form-fitting takes place Attachment of the holding part and thus the seal itself to the machine part. Is also one perfect centering of the seal against the machine part guaranteed.

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 Support results, whereby misalignments are avoided.

Der Vorsprung kann nach einem weiteren Merkmal der Erfindung in einfacher Weise durch Ausklinken aus dem zylindrischen Abschnitt des Halteteils erzeugt werden.According to a further feature of the invention, the protrusion can easily be can be generated by notching out the cylindrical portion of the holding part.

Die entsprechende Ausnehmung im zweiten Maschinenteil wird zweckmäßigerweise als Ringnut ausgebildet. Auf diese Weise ist ein Ausrichten in Umfangsrichtung nicht erforderlich.The corresponding recess in the second machine part is advantageously used as Ring groove formed. In this way, circumferential alignment is 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 curve of the sealing lip, after a Another feature of the invention of the holding part in the section carrying the sealing lip be provided with at least one slot running in the axial direction. Such a slit can also be provided in the protruding sleeve section of the holding part, on the one hand to facilitate pushing the holding part onto the machine part and on the other hand one To achieve pressure on 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.According to a further feature of the invention, the Holding part at the end of the protruding sleeve section trumpet-shaped to the outside be widened.

Der Halteteil kann aus Stahlblech oder auch aus einem anderen Material, wie z.B. einem zähharten Kunststoff hergestellt und die Vorsprünge außer durch Ausklinken auch durch Ausprägen oder Angießen bzw. -spritzen angeformt sein. Eine Fertigung des Halteteils aus Kunststoffhat 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. one tough hard plastic and the projections not only by notching but also by Emboss or cast on or injection molded. A production of the holding part Plastic has the advantage that it is combined in a 2-component injection molding machine can be completely manufactured 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 (9)

Abdichtung für relativ zueinander hin- und hergehende Maschinenteile, insbesondere Ventilschaftabdichtung, bestehend aus einer unter radialer Federvorspannung an dem einen Maschinenteil anliegenden Dichtlippe aus Elastomer und einem die Dichtlippe tragenden hülsenförmigen Halteteil, der axial über die Dichtlippe übersteht und gleichzeitig zur Befestigung der Abdichtung an dem zweiten Maschinenteil dient, dadurch gekennzeichnet, daß der Halteteil (5) im überstehenden Abschnitt (6) mit mindestens einem im wesentlichen schräg nach innen gerichteten Vorsprung (8), der in eine Ausnehmung (9) in der Mantelfläche (7) des zweiten Maschinenteils (3) eingreift, versehen ist.Sealing for machine parts reciprocating relative to one another, in particular Valve stem seal, consisting of a radial spring preload on the a machine part sealing lip made of elastomer and one the sealing lip bearing sleeve-shaped holding part which protrudes axially beyond the sealing lip and also serves to fasten the seal to the second machine part, characterized in that the holding part (5) in the projecting section (6) at least one substantially obliquely inward projection (8), the in a recess (9) in the lateral surface (7) of the second machine part (3) intervenes, is provided. Abdichtung nach Anspruch 1, dadurch gekennzeichnet, daß der nach innen gerichtete Vorsprung (8) im Mittelbereich zwischen der Dichtlippe (1) und dem der Dichtlippe (1) abgewandten Ende des Halteteils (5) vorgesehen ist.Seal according to claim 1, characterized in that the inside directed projection (8) in the central region between the sealing lip (1) and that of Sealing lip (1) facing away from the end of the holding part (5) is provided. Abdichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Ausnehmung der Mantelfläche (7) des zweiten Maschinenteils (3) als eine Ringnut (9) ausgebildet ist.Seal according to claim 1 or 2, characterized in that the recess the outer surface (7) of the second machine part (3) is designed as an annular groove (9) is. Abdichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Vorsprung (8) im Halteteil (5) durch einen aus dem überstehenden Abschnitt ausgeklinkten Materialabschnitt gebildet ist. Sealing according to one of claims 1 to 3, characterized in that the Projection (8) in the holding part (5) by one from the protruding section notched material section is formed. Abdichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Halteteil (5) im Bereich des die Dichtlippe (1) tragenden Abschnitts (10) mit mindestens einem in Axialrichtung verlaufenden Schlitz versehen ist.Sealing according to one of claims 1 to 4, characterized in that the Holding part (5) in the region of the section (10) carrying the sealing lip (1) is provided at least one slot extending in the axial direction. Abdichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Halteteil (5) im überstehenden Hülsenabschnitt (6) mit mindestens einem in Axialrichtung verlaufenden Schlitz versehen ist.Sealing according to one of claims 1 to 5, characterized in that the Holding part (5) in the projecting sleeve section (6) with at least one in Axial direction slot is provided. Abdichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Halteteil (5) am Ende des überstehenden Hülsenabschnittes (6) trompetenförmig nach außen aufgeweitet ist.Sealing according to one of claims 1 to 6, characterized in that the Holding part (5) at the end of the protruding sleeve section (6) trumpet-shaped is widened to the outside. Abdichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Halteteil (5) aus einem Kunststoff gefertigt ist.Sealing according to one of claims 1 to 7, characterized in that the Holding part (5) is made of a plastic. Abdichtung nach einem der Ansprüche 1 bis 8 für die Verwendung als Ventilschaltabdichtung, wobei das erste Maschinenteil als Ventilschaft (4) und das zweite Maschinenteil als Ventilschaftführung (3) ausgebildet ist, dadurch gekennzeichnet, daß die Ausnehmung (9) zur Aufnahme des Vorsprungs (8) des Halteteils (5) in der Ventilschaftführung (3) angeordnet ist.Sealing according to one of claims 1 to 8 for use as Valve switching seal, the first machine part as a valve stem (4) and the second machine part is designed as a valve stem guide (3), thereby characterized in that the recess (9) for receiving the projection (8) of the Holding part (5) is arranged 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
DE19736321 1997-08-21
DE19736321A DE19736321A1 (en) 1997-08-21 1997-08-21 Sealing for machine parts that reciprocate relative to each other

Publications (3)

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

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EP98115062A Expired - Lifetime EP0898056B1 (en) 1997-08-21 1998-08-11 Seal for machine parts reciprocating relatively to one another

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

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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
CN105874248B (en) * 2014-01-22 2017-09-26 Nok株式会社 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
WO2019159785A1 (en) 2018-02-19 2019-08-22 Nok株式会社 Hermetic sealing device and method for manufacturing same
CN113848137B (en) * 2021-09-22 2024-04-12 天津大学 Submarine pipeline corrosion fatigue test device capable of dynamically adjusting environmental parameters

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Also Published As

Publication number Publication date
US6227548B1 (en) 2001-05-08
EP0898056B1 (en) 2002-11-27
DE19736321A1 (en) 1999-03-11
EP0898056A3 (en) 1999-03-24
DE59806411D1 (en) 2003-01-09

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