EP1087108B1 - Valve seal - Google Patents

Valve seal Download PDF

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Publication number
EP1087108B1
EP1087108B1 EP00114494A EP00114494A EP1087108B1 EP 1087108 B1 EP1087108 B1 EP 1087108B1 EP 00114494 A EP00114494 A EP 00114494A EP 00114494 A EP00114494 A EP 00114494A EP 1087108 B1 EP1087108 B1 EP 1087108B1
Authority
EP
European Patent Office
Prior art keywords
lip
annular bead
sealing lip
sealing
seal
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
EP00114494A
Other languages
German (de)
French (fr)
Other versions
EP1087108A1 (en
Inventor
Michael Arora
Pier Giorgio Ferrero
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.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
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 Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP1087108A1 publication Critical patent/EP1087108A1/en
Application granted granted Critical
Publication of EP1087108B1 publication Critical patent/EP1087108B1/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

Definitions

  • the present invention relates to a seal for reciprocating Machine parts, in particular a valve stem seal for Internal combustion engines with one of a metallic sleeve held elastomeric sealing element, the one sealing the machine part comprehensive sealing lip has, by two mutually inclined frusto-conical surfaces is formed.
  • valve stem seal is known from US Pat. No. 3,554,180. in the by placing a cap, the elastomeric seal between this and the valve stem guide is compressed and so an axial pressure is to be achieved on the sealing ring, thereby radially sealing the sealing lip Press valve stem.
  • this construction is not capable of a longer one Operating time to compensate for the asymmetric wear.
  • the invention is therefore based on the object to provide a seal, which is simple in their construction and their manufacture, a defined leakage allowed on the reciprocating machine part and a centric guide of sealing lip and machine part results. It should also a loss of function be avoided with longer operating time.
  • the solution of the task is carried out at a seal of the beginning mentioned genus according to the invention in that preferably the inside bottom side of the sealing lip distributed on its circumference with several concentric, forming a broken Zentrierlippe Is provided annular bead sections whose inner diameter is greater than that Inner diameter of the sealing lip is.
  • the basic structure of metal sleeve and sealing lip are retained.
  • the interrupted centering lip is in the form of several Annular bead sections attached, which the sealing lip in a concentric Position to valve stem stops. The annular bead sections then come into action when a displacement of the parts occurs to each other.
  • the annular bead sections are located in the flexible transition region of the Sealing element between the upper edge of the rigid metal sleeve and the Sealing lip.
  • the interrupted centering lip causes a possibly Displacement of the sealing lip in a concentric position to the valve stem.
  • the number of annular bead sections is on the application of the seal Voted. For a valve stem seal, it should be more than three.
  • the circumferential length of all annular bead sections is on the Scope coordinated. It should be 10 to 90% of Total circumferential length in the range of the annular bead sections amount. The bigger the free space between the individual annular bead sections is lower the possibility of forming any oil pockets.
  • the left half of a seal is shown in longitudinal section.
  • the valve stem 1 undergoes a reciprocating motion and is in the Leadership 2 held.
  • the seal 3 is placed, the the metallic sleeve 4 and a sealing element 5 fixedly connected thereto consists.
  • the sealing element 5 has the sealing lip 6, by the ring clamping spring 7 is pressed against the valve stem 1.
  • the sealing element 5 For attachment to the guide 2 engages the sealing element 5 with known bulges 8 to the Leadership 2.
  • the sealing lip 6 is made of two frustoconical surfaces 9 and 10th formed or limited.
  • the inner surface 10 is the bottom side of the Sealing lip 6. It has several evenly distributed on its circumference concentric annular bead portions 11 whose inner diameter D is larger as the inner diameter d of the sealing lip 6.
  • the annular bead portions 11 form a broken centering lip 20.
  • the annular bead portions 11 are in the flexible transition region 13 of the Seal member 5 between the upper edge 14 of the rigid metal sleeve 4 and arranged the sealing lip 6.
  • the elastomer 15 between the sealing lip 6 and the Centering lip 20 equipped with a different stiffness than the elastomer 16 between the centering lip 20 and the upper edge 14 of the metal sleeve 4th This is achieved in particular by constructive embodiments.

Description

Technisches GebietTechnical area

Die vorliegende Erfindung betrifft eine Dichtung für hin- und hergehende Maschinenteile, insbesondere eine Ventilschaftdichtung für Verbrennungskraftmaschinen mit einem von einer metallischen Hülse gehaltenen elastomeren Dichtelement, das eine das Maschinenteil dichtend umfassende Dichtlippe hat, die durch zwei gegeneinander geneigte kegelstumpfförmige Oberflächen gebildet ist.The present invention relates to a seal for reciprocating Machine parts, in particular a valve stem seal for Internal combustion engines with one of a metallic sleeve held elastomeric sealing element, the one sealing the machine part comprehensive sealing lip has, by two mutually inclined frusto-conical surfaces is formed.

Stand der TechnikState of the art

Aus der US PS 3 554 180 ist beispielsweise eine Ventilschaftdichtung bekannt, bei der durch das Aufsetzen einer Kappe die Elastomerdichtung zwischen dieser und der Ventilschaftführung komprimiert wird und so ein axialer Druck auf den Dichtring erzielt werden soll, um dadurch die Dichtlippe radial an den Ventilschaft anzupressen. Hierdurch sollen eventuell bestehende Exzentrizitäten des Ventilschafts und der Ventilschaftführung ausgeglichen werden. Diese Konstruktion ist jedoch nicht in der Lage über eine längere Betriebsdauer den asymmetrischen Verschleiß zu kompensieren. For example, a valve stem seal is known from US Pat. No. 3,554,180. in the by placing a cap, the elastomeric seal between this and the valve stem guide is compressed and so an axial pressure is to be achieved on the sealing ring, thereby radially sealing the sealing lip Press valve stem. This should possibly existing Exzentrizitäten the valve stem and the valve stem guide balanced become. However, this construction is not capable of a longer one Operating time to compensate for the asymmetric wear.

Eine andere Möglichkeit Exzentrizitäten aufzuheben ist in der US PS 4 947 811 dargestellt, bei der der Dichtring von einer steifen zylindrischen Hülse gehalten wird, gegenüber dieser Hülse jedoch radial verschiebbar ist. Auch diese Anordnung ist nur bedingt einsetzbar, da die exzentrische Verlagerung des Dichtrings durch eine Ringnut im Dichtring und darin eingesetztem Flansch der Hülse erreicht werden soll, die sich gegeneinander verkanten können. Da an der Dichtlippe in axialer Richtung Kräfte auftreten, ist ein solches Verkanten leicht möglich.Another way of eliminating eccentricities is disclosed in US Pat. No. 4,947,811 represented in which the sealing ring held by a stiff cylindrical sleeve is, however, radially displaceable relative to this sleeve. These too Arrangement is only conditionally applicable, since the eccentric displacement of the Sealing ring by an annular groove in the sealing ring and inserted therein the flange Sleeve is to be achieved, which can tilt against each other. As at The sealing lip in the axial direction forces occur is such tilting easily possible.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Dichtung zu schaffen, die einfach in ihrem Aufbau und in ihrer Herstellung ist, eine definierte Leckage am hin- und hergehenden Maschinenteil erlaubt und eine zentrische Führung von Dichtlippe und Maschinenteil ergibt. Dabei soll ein Funktionsverlust auch bei längerer Betriebsdauer vermieden werden.The invention is therefore based on the object to provide a seal, which is simple in their construction and their manufacture, a defined leakage allowed on the reciprocating machine part and a centric guide of sealing lip and machine part results. It should also a loss of function be avoided with longer operating time.

Die Lösung der gestellten Aufgabe erfolgt bei einer Dichtung der eingangs genannten Gattung erfindungsgemäß dadurch, daß vorzugsweise die innenliegende Bodenseite der Dichtlippe auf ihrem Umfang verteilt mit mehreren konzentrischen, eine unterbrochene Zentrierlippe bildenden Ringwulstabschnitten versehen ist, deren Innendurchmesser größer als der Innendurchmesser der Dichtlippe ist. Bei einer solchen Dichtung kann der grundsätzliche Aufbau aus Metallhülse und Dichtlippe beibehalten werden. Im elastischen Teil der Dichtung, an der innenliegenden Oberfläche der Dichtlippe wird die unterbrochene Zentrierlippe in Form von mehreren Ringwulstabschnitten angebracht, welche die Dichtlippe in einer konzentrischen Lage zum Ventilschaft hält. Dabei treten die Ringwulstabschnitte dann in Aktion wenn eine Verschiebung der Teile zueinander auftritt.The solution of the task is carried out at a seal of the beginning mentioned genus according to the invention in that preferably the inside bottom side of the sealing lip distributed on its circumference with several concentric, forming a broken Zentrierlippe Is provided annular bead sections whose inner diameter is greater than that Inner diameter of the sealing lip is. In such a seal, the basic structure of metal sleeve and sealing lip are retained. in the elastic part of the seal, on the inner surface of the sealing lip the interrupted centering lip is in the form of several Annular bead sections attached, which the sealing lip in a concentric Position to valve stem stops. The annular bead sections then come into action when a displacement of the parts occurs to each other.

Die Ringwulstabschnitte befinden sich im flexiblen Übergangsbereich des Dichtelements zwischen der oberen Kante der steifen Metallhülse und der Dichtlippe. Die unterbrochene Zentrierlippe bewirkt gegebenenfalls eine Verschiebung der Dichtlippe in eine konzentrische Position zum Ventilschaft.The annular bead sections are located in the flexible transition region of the Sealing element between the upper edge of the rigid metal sleeve and the Sealing lip. The interrupted centering lip causes a possibly Displacement of the sealing lip in a concentric position to the valve stem.

Außerdem ist es günstig für die Funktion der Dichtung, wenn das Elastomer zwischen der Dichtlippe und der Zentrierlippe eine andere Steifigkeit aufweist als das Elastomer zwischen der Zentrierlippe und der oberen Kante der Metallhülse.In addition, it is beneficial for the function of the gasket when the elastomer has a different stiffness between the sealing lip and the centering lip as the elastomer between the centering lip and the upper edge of the Metal sleeve.

Die Anzahl der Ringwulstabschnitte wird auf den Einsatzbereich der Dichtung abgestimmt. Bei einer Ventilschaftdichtung sollte sie mehr als drei betragen. Auch die Umfangslänge aller Ringwulstabschnitte wird auf den Anwendungsbereich abgestimmt. Sie sollte 10 bis 90 % der Gesamtumfangslänge im Bereich der Ringwulstabschnitte betragen. Je größer der Freiraum zwischen den einzelnen Ringwulstabschnitten um so geringer ist die Möglichkeit für die Bildung von eventuellen Öltaschen.The number of annular bead sections is on the application of the seal Voted. For a valve stem seal, it should be more than three. The circumferential length of all annular bead sections is on the Scope coordinated. It should be 10 to 90% of Total circumferential length in the range of the annular bead sections amount. The bigger the free space between the individual annular bead sections is lower the possibility of forming any oil pockets.

Kurzbeschreibung der ZeichnungBrief description of the drawing

In der beiliegenden Zeichnung ist ein Ausführungsbeispiel dargestellt. In the accompanying drawings an embodiment is shown.

Ausführung der ErfindungEmbodiment of the invention

In der Figur 1 ist im Längsschnitt die linke Hälfte einer Dichtung dargestellt. Der Ventilschaft 1 erfährt eine hin- und hergehende Bewegung und ist in der Führung 2 gehalten. Auf die Führung 2 ist die Dichtung 3 aufgesetzt, die aus der metallischen Hülse 4 und einem damit fest verbundenen Dichtelement 5 besteht. Das Dichtelement 5 hat die Dichtlippe 6, die durch die Ringspannfeder 7 an den Ventilschaft 1 angedrückt wird. Zur Befestigung auf der Führung 2 greift das Dichtelement 5 mit an sich bekannten Auswölbungen 8 um die Führung 2.In the figure 1, the left half of a seal is shown in longitudinal section. The valve stem 1 undergoes a reciprocating motion and is in the Leadership 2 held. On the guide 2, the seal 3 is placed, the the metallic sleeve 4 and a sealing element 5 fixedly connected thereto consists. The sealing element 5 has the sealing lip 6, by the ring clamping spring 7 is pressed against the valve stem 1. For attachment to the guide 2 engages the sealing element 5 with known bulges 8 to the Leadership 2.

Die Dichtlippe 6 wird von zwei kegelstumpfförmigen Oberflächen 9 und 10 gebildet bzw. begrenzt. Die innenliegende Oberfläche 10 ist die Bodenseite der Dichtlippe 6. Sie hat auf ihrem Umfang gleichmäßig verteilt mehrere konzentrische Ringwulstabschnitte 11, deren Innendurchmesser D größer ist als der Innendurchmesser d der Dichtlippe 6. Die Ringwulstabschnitte 11 bilden eine unterbrochene Zentrierlippe 20. Im vorliegenden Beispiel sind vier Ringwulstabschnitte 11 vorgesehen, die etwa 80 % der Gesamtumfangslänge im Bereich der Ringwulstabschnitte 11 einnehmen. Die Freibereiche zwischen den Ringwulstabschnitten 11, d.h. die Bereiche in denen die Oberfläche 10 konzentrisch weitergeführt ist, betragen somit insgesamt 20 %.The sealing lip 6 is made of two frustoconical surfaces 9 and 10th formed or limited. The inner surface 10 is the bottom side of the Sealing lip 6. It has several evenly distributed on its circumference concentric annular bead portions 11 whose inner diameter D is larger as the inner diameter d of the sealing lip 6. The annular bead portions 11 form a broken centering lip 20. In this example, there are four Provided annular bead portions 11, which is about 80% of the total circumference in the area of the annular bead portions 11 occupy. The outdoor areas between the annular bead sections 11, i. the areas where the surface 10 is carried out concentrically, thus total 20%.

Die Ringwulstabschnitte 11 sind im flexiblen Übergangsbereich 13 des Dichtelements 5 zwischen der oberen Kante 14 der steifen Metallhülse 4 und der Dichtlippe 6 angeordnet.The annular bead portions 11 are in the flexible transition region 13 of the Seal member 5 between the upper edge 14 of the rigid metal sleeve 4 and arranged the sealing lip 6.

Darüberhinaus ist das Elastomer 15 zwischen der Dichtlippe 6 und der Zentrierlippe 20 mit einer anderen Steifigkeit ausgestattet als das Elastomer 16 zwischen der Zentrierlippe 20 und der oberen Kante 14 der Metallhülse 4. Dieses wird insbesondere durch konstruktive Ausgestaltungen erreicht.Moreover, the elastomer 15 between the sealing lip 6 and the Centering lip 20 equipped with a different stiffness than the elastomer 16 between the centering lip 20 and the upper edge 14 of the metal sleeve 4th This is achieved in particular by constructive embodiments.

Es wird noch angemerkt, daß die Ringwulstabschnitte 11 ohne Einfluß auf die gewollte Leckage sind. Versuche haben ergeben, daß die Positionierung der Zentrierlippe 20 unterhalb der Dichtlippe 6, d.h. auf ihrer Bodenseite 10 zu besten Ergebnissen führt. Eine Anordnung der Zentrierlippe oberhalb der Dichtlippe 6 ist jedoch auch möglich.It should be noted that the annular bead portions 11 without influence on the intentional leakage. Experiments have shown that the positioning of Centering lip 20 below the sealing lip 6, i. on its bottom side 10 too leads to the best results. An arrangement of the centering lip above the Sealing lip 6 is also possible.

Claims (6)

  1. A seal for machine parts moving to and fro, in particular a valve stem seal for internal combustion engines, with an elastomeric sealing element which is held by a metallic sleeve and which has a sealing lip which sealingly surrounds the machine part and is formed by two frustoconical surfaces inclined relative to one another, characterized in that the inner bottom side (10) of the sealing lip (6) is provided, distributed around its circumference, with a plurality of concentric annular bead portions (11) which form an interrupted centring lip (20) having an inside diameter (D) which is larger than the inside diameter (d) of the sealing lip (6).
  2. A seal according to claim 1, characterized in that the centring lip (20) is arranged in the flexible transitional region (13) of the sealing element (5) between the upper edge (14) of the rigid metal sleeve (4) and the sealing lip (6).
  3. A seal according to either of claims 1 and 2, characterized in that the elastomer (15) between the sealing lip (6) and the centring lip (20) has a different rigidity from the elastomer (16) between the centring lip (20) and the upper edge (14) of the metal sleeve (4).
  4. A seal according to any one of claims 1 to 3, characterized in that the number of annular bead portions (11) is more than three.
  5. A seal according to any one of claims 1 to 4, characterized in that the circumferential length of all the annular bead portions (11) is 10 to 90% of the overall circumferential length in the region of the annular bead portions (11).
  6. A seal according to any one of claims 1 to 5, characterized in that the annular bead portions (11) have a higher rigidity than the sealing lip (6).
EP00114494A 1999-09-22 2000-07-06 Valve seal Expired - Lifetime EP1087108B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19945348 1999-09-22
DE19945348A DE19945348C2 (en) 1999-09-22 1999-09-22 Seal for reciprocating machine parts

Publications (2)

Publication Number Publication Date
EP1087108A1 EP1087108A1 (en) 2001-03-28
EP1087108B1 true EP1087108B1 (en) 2004-11-17

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EP00114494A Expired - Lifetime EP1087108B1 (en) 1999-09-22 2000-07-06 Valve seal

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DE (2) DE19945348C2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10116846A1 (en) * 2001-04-04 2002-10-31 Freudenberg Carl Kg seal
DE10207382C1 (en) * 2002-02-21 2003-05-15 Freudenberg Carl Kg Shaft seal for IC engine has protuberances on the sealing lip to lift the lip slightly to control the flow of lubricant
JP2007218282A (en) * 2006-02-14 2007-08-30 Nok Corp Sealing device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326562A (en) * 1963-01-18 1967-06-20 Goetzewerke Valve-shaft seal for internal combustion engines
US3554180A (en) 1969-03-21 1971-01-12 Gen Motors Corp Valve stem seal
US4125265A (en) * 1977-07-06 1978-11-14 Borg-Warner Corporation Valve stem seal
GB8323418D0 (en) * 1983-09-01 1983-10-05 Fenner Co Ltd J H Valve stem seals
DE3524560A1 (en) * 1985-07-10 1987-01-15 Porsche Ag VALVE GUIDE
US4947811A (en) 1989-06-30 1990-08-14 Dana Corporation Floating valve stem seal
FR2708037B1 (en) * 1993-07-20 1995-09-01 Procal Valve stem seal.
US5553869A (en) * 1994-12-12 1996-09-10 Dana Corporation Bonded valve stem seal with retainer tangs
DE19841123B4 (en) * 1998-09-09 2008-01-03 Vr Dichtungen Gmbh Radial shaft seal
FR2784732B1 (en) * 1998-10-20 2000-12-01 France Joint WATERPROOFING CARTRIDGE

Also Published As

Publication number Publication date
EP1087108A1 (en) 2001-03-28
DE50008651D1 (en) 2004-12-23
DE19945348A1 (en) 2001-04-19
DE19945348C2 (en) 2003-07-10

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