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EP0774568B1 - Valve stem sealing arrangement - Google Patents

Valve stem sealing arrangement Download PDF

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Publication number
EP0774568B1
EP0774568B1 EP96113464A EP96113464A EP0774568B1 EP 0774568 B1 EP0774568 B1 EP 0774568B1 EP 96113464 A EP96113464 A EP 96113464A EP 96113464 A EP96113464 A EP 96113464A EP 0774568 B1 EP0774568 B1 EP 0774568B1
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EP
European Patent Office
Prior art keywords
valve
spring
sealing
sleeve
sealing body
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
EP96113464A
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German (de)
French (fr)
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EP0774568A1 (en
Inventor
David Sakata
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Carl Freudenberg KG
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Carl Freudenberg KG
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Publication date
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Publication of EP0774568A1 publication Critical patent/EP0774568A1/en
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Publication of EP0774568B1 publication Critical patent/EP0774568B1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00Lift-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
    • F01L3/08Valves guides; Sealing of valve stem, e.g. sealing by lubricant

Definitions

  • the invention relates to a valve stem seal in an internal combustion engine comprising a sleeve made of tough hard Material with a first and a second end face, the sleeve on its first end face extending in the radial direction to the outside Has flange and on the axially opposite second end face extending inwardly in the radial direction support wall, the Flange forms the abutment for a valve spring, with a valve stem sealingly enclosing ring-shaped sealing body through a press fit sealingly touches the inner circumference of the sleeve and the support wall and the Sealing body has at least one annular first sealing lip.
  • valve stem seal is known from EP 0 392 893 A1.
  • the sleeve is positively connected to a valve stem guide, an annular sealing body made of elastomeric material being arranged in the axial direction between the support wall, the sleeve and the end face of the valve stem guide.
  • the annular first sealing lip of the sealing body surrounds the valve stem with a radial preload, and one second sealing lip is supported on the front of the valve stem guide.
  • the elastic pressure on the two sealing lips is achieved by the elasticity of the material from which the sealing body is made.
  • valve stem seal is from US-A-5,174,256 known.
  • the sleeve has a radially outwardly extending Flange, which is designed as an abutment for the valve spring.
  • To the The flange closes a cylinder section which extends essentially in the axial direction on.
  • a Support body of a valve stem seal guided the valve stem seal a first sealing lip sealingly enclosing the valve stem and a second Has sealing lip, which is supported on the end face of a valve stem guide is.
  • the first sealing lip is radially on the outer circumferential side of an annular spring enclosed.
  • the helical spring is separate in relation to the support body created and assembled.
  • a piston seal is known from EP 0 333 961 A1.
  • the piston seal is formed in two parts and comprises a sealing body by a support body is enclosed.
  • the invention has for its object a valve stem seal at the beginning mentioned type to develop such that the sealing body and Spring secured against loss and permanently positioned to each other, that the sealing arrangement is more compact, less weight has and is inexpensive to manufacture and easy to assemble.
  • the sealing body with a support body is connected that the support body at least as a spring for pressing an annular first sealing lip is formed on the valve stem and that the spring is supported directly on the support wall.
  • the sealing body consists of an elastomeric material and at least has an annular first sealing lip.
  • the sealing body has a second sealing lip on the side facing away from the spring Front side of the sealing body, the second sealing lip with the frontal limit of the valve guide is sealingly engaged.
  • the sleeve is pressed against the valve guide in the axial direction by a valve spring and is held in place.
  • the sealing body is arranged inside the sleeve, the valve stem by a preloaded spring with its first sealing lip sealingly encloses and with its second sealing lip the valve guide touched.
  • the first sealing lip seals the reciprocating one Valve stem dynamic
  • the second sealing lip seals against the valve guide static.
  • the dynamic sealing of the first sealing lip on the valve stem on the one hand leads to adequate lubrication in the area dynamic sealing is guaranteed and is prevented on the other hand, that an undesirably large leakage occurs, for example, via the valve stem the cylinders of the internal combustion engine arrive.
  • an undesirably large leakage occurs, for example, via the valve stem the cylinders of the internal combustion engine arrive.
  • the sleeve has at least two extending in the axial direction Sealing body on the circumferential enclosing claws, which in each other The circumferential direction is spaced adjacent and evenly in the circumferential direction are distributed.
  • the retaining wall is preferred by the Holding claws formed.
  • the advantage here is that the holding claws Material required to manufacture the sleeve - based on a circumferential direction self-contained sleeve - is significantly reduced. It can be provided that four are uniform in the circumferential direction distributed retaining claws are used, the circumference of the sealing body enclose. Both the first and the second sealing lip lie in each case under elastic prestress on the component to be sealed.
  • the Assembly of the sealing arrangement simplified and easy assignment the parts are guaranteed for the entire service life.
  • the Combining the two sealing lips in a sealing body is both the manufacture as well as the assembly of the seal assembly simplified.
  • the inclusion of the two sealing lips in a sealing body Amount of the elastomeric material required for a reliable seal reduced to a minimum.
  • the retaining wall which is the abutment for the one-piece connected to the sealing body Spring forms part of the claws.
  • the sleeve can consist of a metallic or polymeric material. in the With regard to the lowest possible relaxation of the sleeve and the spring given preference to one metallic material each.
  • the spring can consist of a polymeric material.
  • the spring preferably has an essentially L-shaped cross section.
  • the leg extending essentially in the axial direction covers the first sealing lip completely in the axial direction. This ensures that the first sealing lip always the valve stem with a predetermined bias encloses tightly.
  • valve stem seal 10 includes.
  • the sleeve 14 consists in this embodiment of a metallic material. Deviating from this, however, can also, for example tough, hard polymeric materials are used.
  • the sealing body 24 consists of rubber or elastomer, the first sealing lip 28 by two intersecting conical surfaces is formed and the valve stem 12 sealingly touched on the circumferential side under elastic prestress.
  • the valve stem 12 is guided within the valve guide 38.
  • the valve acts against the spring force of the valve spring 16 by a camshaft, not shown here, in the open position and then transferred back to the closed position by the valve spring 16.
  • the sleeve 14 On its first end face, the sleeve 14 has a radial direction outwardly extending flange 20 on and on the axially opposite second end face an inwardly extending in the radial direction Support wall 18.
  • the support wall 18 forms the abutment for the spring 26 and touches them immediately.
  • the elastomeric material also seals of the sealing body 24 from the sleeve 14.
  • the one that extends radially outward Flange 20 serves as an abutment for the valve spring 16.
  • the cylinder head 22 consists for example of a light metal alloy. Deviating from this the cylinder head can also consist of cast iron.
  • the second sealing lip 34 of the sealing body 24 statically seals the valve guide 38 from.
  • the sealing body 24 is shown, which forms a unit with the spring 26. Both the first sealing lip 28 and the second sealing lip 34 are shown in FIG are ring-shaped and touch the surfaces to be sealed below elastic pre-tension.
  • the spring 26 is annular and consists in this embodiment of a polymeric material. Regarding a low weight of the sealing arrangement is one Design of advantage to be emphasized.
  • the elastomeric material of the Sealing body 24 is during its manufacture with the spring 26 by vulcanization connected. In that the spring 26 and the sealing body 24 in one piece are merged into each other, is a jumping out of the Spring 26 excluded from the sleeve 14 during assembly.
  • the unit, consisting of the spring 26 and the sealing body 24 is thus within the Sleeve 14 placed that the spring 26, the support wall 18 directly adjacent touched.
  • the sealing body 24 is sealed within with elastic prestress the sleeve 14 arranged.
  • the sealing arrangement according to the invention brings about an exact concentric assignment of sleeve 14, sealing body 24 and valve stem 12 to each other. For good performance during a long period Service life, this is a noteworthy advantage.
  • the sleeve 14 is shown as a single part in a sectional view. It it can be seen that in this embodiment four are in the axial direction extending holding claws 36 are provided which are mutually circumferential spaced adjacent and even in the circumferential direction are distributed.
  • the advantage here is that the entire bearing arrangement a comparatively low weight due to such a design and significant material savings are possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Lift Valve (AREA)
  • Temperature-Responsive Valves (AREA)

Abstract

An improved valve stem seal assembly for use in an internal combustion engine, including a rigid cylindrical shell having a flange portion and a seal retainer wall at the top portion. The valve stem seal assembly also includes a seal body having an integral spring molded within the body. The seal body having at least one annular lip to engage a reciprocating valve stem and a ridge or lip on the bottom portion of the seal body to engage and center the seal body in its proper position on the valve guide. The seal body being disposed within the rigid shell to form a valve stem seal assembly.

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Ventilschaftabdichtung in einer Verbrennungskraftmaschine, umfassend eine Hülse aus zähhartem Werkstoff mit einer ersten und einer zweiten Stirnseite, wobei die Hülse an ihrer ersten Stirnseite einen sich in radialer Richtung nach außen erstreckenden Flansch aufweist und an der axial gegenüberliegenden zweiten Stirnseite eine sich in radialer Richtung nach innen erstreckende Stützwand, wobei der Flansch das Widerlager für eine Ventilfeder bildet, wobei ein einen Ventilschaft dichtend umschließender ringförmiger Dichtkörper durch eine Presspassung den Innenumfang der Hülse und die Stützwand dichtend berührt und wobei der Dichtkörper zumindest eine ringförmige erste Dichtlippe aufweist.The invention relates to a valve stem seal in an internal combustion engine comprising a sleeve made of tough hard Material with a first and a second end face, the sleeve on its first end face extending in the radial direction to the outside Has flange and on the axially opposite second end face extending inwardly in the radial direction support wall, the Flange forms the abutment for a valve spring, with a valve stem sealingly enclosing ring-shaped sealing body through a press fit sealingly touches the inner circumference of the sleeve and the support wall and the Sealing body has at least one annular first sealing lip.

Stand der TechnikState of the art

Eine solche Ventilschaftabdichtung ist aus der EP 0 392 893 A1 bekannt. Die Hülse ist mit einer Ventilschaftführung formschlüssig verbunden, wobei ein ringförmiger, aus elastomerem Werkstoff bestehender Dichtkörper in axialer Richtung zwischen der Stützwand, der Hülse und der Stirnseite der Ventilschaftführung angeordnet ist. Die ringförmige erste Dichtlippe des Dichtkörpers umschließt den Ventilschaft mit radialer Vorspannung dichtend, und eine
zweite Dichtlippe ist auf der Stirnseite der Ventilschaftführung abgestützt. Die elastische Anpressung der beiden Dichtlippen erfolgt durch die Elastizität des Werkstoffs, aus dem der Dichtkörper besteht.
Such a valve stem seal is known from EP 0 392 893 A1. The sleeve is positively connected to a valve stem guide, an annular sealing body made of elastomeric material being arranged in the axial direction between the support wall, the sleeve and the end face of the valve stem guide. The annular first sealing lip of the sealing body surrounds the valve stem with a radial preload, and one
second sealing lip is supported on the front of the valve stem guide. The elastic pressure on the two sealing lips is achieved by the elasticity of the material from which the sealing body is made.

Eine weitere Ventilschaftabdichtung ist aus der US-A-5,174,256 bekannt. Die Hülse weist einen sich radial nach außen erstreckenden Flansch auf, der als Widerlager für die Ventilfeder ausgebildet ist. An den Flansch schließt sich ein im wesentlichen in axialer Richtung erstreckender Zylinderabschnitt an. In dem in axialer Richtung offenen Zylinderabschnitt ist ein Stützkörper einer Ventilschaftdichtung geführt, wobei die Ventilschaftdichtung eine den Ventilschaft dichtend umschließende erste Dichtlippe und eine zweite Dichtlippe aufweist, die auf der Stirnseite einer Ventilschaftführung abgestützt ist. Die erste Dichtlippe wird von einer Ringwendelfeder radial außenumfangsseitig umschlossen. Die Ringwendelfeder ist, bezogen auf den Stützkörper, separat erzeugt und montiert.Another valve stem seal is from US-A-5,174,256 known. The sleeve has a radially outwardly extending Flange, which is designed as an abutment for the valve spring. To the The flange closes a cylinder section which extends essentially in the axial direction on. In the open cylinder section in the axial direction is a Support body of a valve stem seal guided, the valve stem seal a first sealing lip sealingly enclosing the valve stem and a second Has sealing lip, which is supported on the end face of a valve stem guide is. The first sealing lip is radially on the outer circumferential side of an annular spring enclosed. The helical spring is separate in relation to the support body created and assembled.

Eine Kolbendichtung ist aus der EP 0 333 961 A1 bekannt. Die Kolbendichtung ist zweiteilig ausgebildet und umfasst einen Dichtkörper, der von einem Stützkörper umschlossen ist.A piston seal is known from EP 0 333 961 A1. The piston seal is formed in two parts and comprises a sealing body by a support body is enclosed.

Eine weitere Ventilschaftabdichtung in einer Verbrennungskraftmaschine, ist aus der US 4,947,811 bekannt. Die Feder, die den Dichtkörper gegen eine abzudichtende Fläche vorspannt und in sich geschlossen ringförmig ausgebildet ist, ist nicht verliersicher mit dem Dichtkörper verbunden, so dass sie während des Einbaus oder des Gebrauchs der Dichtungsanordnung innerhalb des Einbauraums verschoben werden oder aus diesem herausspringen kann. Durch eine Veränderung der Lage der Feder oder deren Verlust, wird die Vorspannung auf den Dichtkörper derart reduziert, dass es zu unerwünschten Undichtigkeiten zwischen der Ventilschaftabdichtung und den abzudichtenden Bauteilen kommen kann. Die vorbekannte Dichtungsanordnung weist außerdem ein vergleichsweise hohes Gewicht auf, und die Herstellung ist in fertigungstechnischer und wirtschaftlicher Hinsicht wenig zufriedenstellend.Another valve stem seal in an internal combustion engine, is known from US 4,947,811. The feather that the Prestressed sealing body against a surface to be sealed and closed in itself is ring-shaped, is not captively connected to the sealing body, so that during the installation or use of the seal assembly be moved within or out of the installation space can jump out. By changing the position of the spring or its Loss, the preload on the sealing body is reduced so that it too undesirable leaks between the valve stem seal and the components to be sealed. The known seal arrangement also has a comparatively high weight, and the manufacture is not very satisfactory in terms of manufacturing technology and economy.

Der Erfindung liegt die Aufgabe zugrunde, eine Ventilschaftabdichtung der eingangs genannten Art derart weiterzuentwickeln, dass der Dichtkörper und die Feder verliergesichert und dauerhaft positioniert zueinander angeordnet sind, dass die Dichtungsanordnung kompakter ausgebildet ist, ein geringeres Gewicht aufweist und kostengünstig herstellbar sowie einfach montierbar ist.The invention has for its object a valve stem seal at the beginning mentioned type to develop such that the sealing body and Spring secured against loss and permanently positioned to each other, that the sealing arrangement is more compact, less weight has and is inexpensive to manufacture and easy to assemble.

Gelöst wird diese Aufgabe durch die Merkmale von Anspruch 1. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved by the features of claim 1. On advantageous Refinements refer to the subclaims.

Gelöst wird diese Aufgabe dadurch, dass der Dichtkörper mit einem Stützkörper verbunden ist, dass der Stützkörper als Feder zur Anpressung zumindest einer ringförmigen ersten Dichtlippe an den Ventilschaft ausgebildet ist und dass die Feder unmittelbar an der Stützwand abgestützt ist.This problem is solved in that the sealing body with a support body is connected that the support body at least as a spring for pressing an annular first sealing lip is formed on the valve stem and that the spring is supported directly on the support wall.

Der Dichtkörper besteht aus einem elastomeren Werkstoff und weist zumindest eine ringförmige erste Dichtlippe auf.The sealing body consists of an elastomeric material and at least has an annular first sealing lip.

Außerdem weist der Dichtkörper eine zweite Dichtlippe auf der der Feder abgewandten Stirnseite des Dichtkörpers auf, wobei die zweite Dichtlippe mit der stimseitigen Begrenzung der Ventilführung dichtend in Eingriff ist. Die Hülse ist in axialer Richtung durch eine Ventilfeder gegen die Ventilführung gedrückt und wird in ihrer Position gehalten. Innerhalb der Hülse ist der Dichtkörper angeordnet, der durch eine vorgespannte Feder mit seiner ersten Dichtlippe den Ventilschaft dichtend umschließt und mit seiner zweiten Dichtlippe die Ventilführung anliegend berührt. Die erste Dichtlippe dichtet den hin- und herbeweglichen Ventilschaft dynamisch, die zweite Dichtlippe dichtet gegenüber der Ventilführung statisch ab. Die dynamische Abdichtung der ersten Dichtlippe am Ventilschaft führt einerseits dazu, dass eine ausreichende Schmierung im Bereich der dynamischen Abdichtung gewährleistet ist und andererseits verhindert wird, dass eine unerwünscht große Leckage beispielsweise über den Ventilschaft in die Zylinder der Verbrennungskraftmaschine gelangen. Durch die einstückige Ausbildung des Dichtkörpers mit der Feder, die eine vormontierbare Einheit bilden, ist während der bestimmungsgemäßen Verwendung der Ventilschaftabdichtung eine exakte Zuordnung der beiden Teile zueinander gewährleistet.In addition, the sealing body has a second sealing lip on the side facing away from the spring Front side of the sealing body, the second sealing lip with the frontal limit of the valve guide is sealingly engaged. The sleeve is pressed against the valve guide in the axial direction by a valve spring and is held in place. The sealing body is arranged inside the sleeve, the valve stem by a preloaded spring with its first sealing lip sealingly encloses and with its second sealing lip the valve guide touched. The first sealing lip seals the reciprocating one Valve stem dynamic, the second sealing lip seals against the valve guide static. The dynamic sealing of the first sealing lip on the valve stem on the one hand leads to adequate lubrication in the area dynamic sealing is guaranteed and is prevented on the other hand, that an undesirably large leakage occurs, for example, via the valve stem the cylinders of the internal combustion engine arrive. Through the one-piece Formation of the sealing body with the spring, which form a preassembled unit, is during the intended use of the valve stem seal an exact assignment of the two parts to each other is guaranteed.

Die Hülse weist zumindest zwei sich in axialer Richtung erstreckende, den Dichtkörper umfangsseitig umschließende Haltekrallen auf, die einander in Umfangsrichtung mit Abstand benachbart zugeordnet und gleichmäßig in Umfangsrichtung verteilt angeordnet sind. Die Stützwand ist bevorzugt durch die Haltekrallen gebildet. Hierbei ist von Vorteil, dass durch die Haltekrallen der Materialbedarf zur Herstellung der Hülse - bezogen auf eine in Umfangsrichtung in sich geschlossen ausgebildete Hülse - deutlich verringert ist. Es kann beispielsweise vorgesehen sein, dass vier gleichmäßig in Umfangsrichtung verteilte Haltekrallen zur Anwendung gelangen, die den Dichtkörper umfangsseitig umschließen. Sowohl die erste als auch die zweite Dichtlippe liegen jeweils unter elastischer Vorspannung am jeweils abzudichtenden Bauteil an. Durch die Anordnung des Dichtkörpers innerhalb der Hülse und deren Festlegung an der Ventilführung und dem Ventilschaft weist die Dichtungsanordnung nur eine vergleichsweise geringe Ausdehnung in axialer Richtung auf.The sleeve has at least two extending in the axial direction Sealing body on the circumferential enclosing claws, which in each other The circumferential direction is spaced adjacent and evenly in the circumferential direction are distributed. The retaining wall is preferred by the Holding claws formed. The advantage here is that the holding claws Material required to manufacture the sleeve - based on a circumferential direction self-contained sleeve - is significantly reduced. It can For example, it can be provided that four are uniform in the circumferential direction distributed retaining claws are used, the circumference of the sealing body enclose. Both the first and the second sealing lip lie in each case under elastic prestress on the component to be sealed. By arranging the sealing body within the sleeve and fixing it on the valve guide and the valve stem has the seal arrangement only a comparatively small expansion in the axial direction.

Durch die einstückige Ausbildung der Feder mit dem Dichtkörper wird die Montage der Dichtungsanordnung vereinfacht und eine problemlose Zuordnung der Teile während der gesamten Gebrauchsdauer sichergestellt. Durch die Kombination der beiden Dichtlippen in einem Dichtkörper sind sowohl die Herstellung als auch die Montage der Dichtungsanordnung vereinfacht. Außerdem wird durch das Einbeziehen der beiden Dichtlippen in einen Dichtkörper die Menge des für eine zuverlässige Abdichtung benötigten elastomeren Werkstoffs auf ein Minimum reduziert. Due to the one-piece design of the spring with the sealing body, the Assembly of the sealing arrangement simplified and easy assignment the parts are guaranteed for the entire service life. Through the Combining the two sealing lips in a sealing body is both the manufacture as well as the assembly of the seal assembly simplified. Moreover is the inclusion of the two sealing lips in a sealing body Amount of the elastomeric material required for a reliable seal reduced to a minimum.

Die Stützwand, die das Widerlager für die einstückig mit dem Dichtkörper verbundene Feder bildet, ist ein Bestandteil der Haltekrallen.The retaining wall, which is the abutment for the one-piece connected to the sealing body Spring forms part of the claws.

Die Hülse kann aus einem metallischen oder polymeren Werkstoff bestehen. Im Hinblick auf eine möglichst geringe Relaxation der Hülse und der Feder wird jeweils einem metallischen Werkstoff der Vorzug gegeben.The sleeve can consist of a metallic or polymeric material. in the With regard to the lowest possible relaxation of the sleeve and the spring given preference to one metallic material each.

Davon abweichend kann die Feder aus einem polymeren Werkstoff bestehen.Deviating from this, the spring can consist of a polymeric material.

Bevorzugt weist die Feder einen im wesentlichen L-förmigen Querschnitt auf. Der sich im wesentlichen in axialer Richtung erstreckende Schenkel überdeckt die erste Dichtlippe in axialer Richtung vollständig. Dadurch ist sichergestellt, daß die erste Dichtlippe stets mit einer vorbestimmten Vorspannung den Ventilschaft anliegend umschließt.The spring preferably has an essentially L-shaped cross section. The leg extending essentially in the axial direction covers the first sealing lip completely in the axial direction. This ensures that the first sealing lip always the valve stem with a predetermined bias encloses tightly.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Die beanspruchte Ventilschaftabdichtung wird nachfolgend anhand der Zeichnungen weiter verdeutlicht. Es zeigen:

  • Figur 1 einen Ausschnitt aus dem Ventiltrieb einer Verbrennungskraftmaschine,
  • Figur 2 den Dichtkörper als Einzelteil,
  • Figur 3 die Hülse und
  • Figur 4 eine vormontierbare Einheit bestehend aus der Hülse und dem Dichtkörper im noch nicht montierten Zustand.
  • The valve stem seal claimed is further illustrated below with the aid of the drawings. Show it:
  • FIG. 1 shows a detail from the valve train of an internal combustion engine,
  • FIG. 2 the sealing body as an individual part,
  • Figure 3 and the sleeve
  • Figure 4 is a preassembled unit consisting of the sleeve and the sealing body in the not yet assembled state.
  • Ausführung der ErfindungImplementation of the invention

    In Figur 1 ist eine Dichtungsanordnung gezeigt, die eine Ventilschaftabdichtung 10 umfaßt. Die Hülse 14 besteht in diesem Ausführungsbeispiel aus einem metallischen Werkstoff. Davon abweichend können jedoch beispielsweise auch zähharte polymere Werkstoffe zur Anwendung gelangen. Der Dichtkörper 24 besteht aus Gummi oder Elastomer, wobei die erste Dichtlippe 28 durch zwei einander durchschneidende Kegelfächen gebildet ist und den Ventilschaft 12 unter elastischer Vorspannung umfangsseitig dichtend berührt. Der Ventilschaft 12 ist innerhalb der Ventilführung 38 geführt. Während des Betriebs der Verbrennungskraftmaschine wird das Ventil gegen die Federkraft der Ventilfeder 16 durch eine hier nicht dargestellte Nockenwelle in Offenstellung und anschließend durch die Ventilfeder 16 wieder in Geschlossenstellung überführt. An ihrer ersten Stirnseite weist die Hülse 14 einen sich in radialer Richtung nach außen erstreckenden Flansch 20 auf und an der axial gegenüberliegenden zweiten Stirnseite eine sich in radialer Richtung nach innen erstreckende Stützwand 18. Die Stützwand 18 bildet das Widerlager für die Feder 26 und berührt diese unmittelbar anliegend. Außerdem dichtet der elastomere Werkstoff des Dichtkörpers 24 die Hülse 14 ab. Der sich radial nach außen erstrekkende Flansch 20 dient als Widerlager für die Ventilfeder 16. Der Zylinderkopf 22 besteht beispielsweise aus einer Leichtmetallegierung. Davon abweichend kann der Zylinderkopf auch aus Gußeisen bestehen.In Figure 1, a seal arrangement is shown, the valve stem seal 10 includes. The sleeve 14 consists in this embodiment of a metallic material. Deviating from this, however, can also, for example tough, hard polymeric materials are used. The sealing body 24 consists of rubber or elastomer, the first sealing lip 28 by two intersecting conical surfaces is formed and the valve stem 12 sealingly touched on the circumferential side under elastic prestress. The valve stem 12 is guided within the valve guide 38. During the operation of the internal combustion engine the valve acts against the spring force of the valve spring 16 by a camshaft, not shown here, in the open position and then transferred back to the closed position by the valve spring 16. On its first end face, the sleeve 14 has a radial direction outwardly extending flange 20 on and on the axially opposite second end face an inwardly extending in the radial direction Support wall 18. The support wall 18 forms the abutment for the spring 26 and touches them immediately. The elastomeric material also seals of the sealing body 24 from the sleeve 14. The one that extends radially outward Flange 20 serves as an abutment for the valve spring 16. The cylinder head 22 consists for example of a light metal alloy. Deviating from this the cylinder head can also consist of cast iron.

    Die zweite Dichtlippe 34 des Dichtkörpers 24 dichtet die Ventilführung 38 statisch ab.The second sealing lip 34 of the sealing body 24 statically seals the valve guide 38 from.

    In Figur 2 ist der Dichtkörper 24 gezeigt, der mit der Feder 26 eine Einheit bildet. Sowohl die erste Dichtlippe 28 als auch die zweite Dichtlippe 34 sind in sich ringförmig ausgebildet und berühren die abzudichtenden Flächen unter elastischer Vorspannung anliegend. Die Feder 26 ist ringförmig ausgebildet und besteht in diesem Ausführungsbeispiel aus einem polymeren Werkstoff. Hinsichtlich eines geringen Gewichts der Dichtungsanordnung ist eine derartige Ausgestaltung von hervorzuhebendem Vorteil. Der elastomere Werkstoff des Dichtkörpers 24 wird während seiner Herstellung mit der Feder 26 durch Vukanisation verbunden. Dadurch, daß die Feder 26 und der Dichtkörper 24 einstückig ineinander übergehend ausgebildet sind, ist ein Herausspringen der Feder 26 aus der Hülse 14 während der Montage ausgeschlossen. Die Einheit, bestehend aus der Feder 26 und dem Dichtkörper 24 wird derart innerhalb der Hülse 14 plaziert, daß die Feder 26 die Stützwand 18 unmittelbar anliegend berührt. Der Dichtkörper 24 ist mit elastischer Vorspannung dichtend innerhalb der Hülse 14 angeordnet. Die erfindungsgemäße Dichtungsanordnung bewirkt eine exakte konzentrische Zuordnung von Hülse 14, Dichtkörper 24 und Ventilschaft 12 zueinander. Für gute Gebrauchseigenschaften während einer langen Gebrauchsdauer ist dies von hervorzuhebendem Vorteil.In Figure 2, the sealing body 24 is shown, which forms a unit with the spring 26. Both the first sealing lip 28 and the second sealing lip 34 are shown in FIG are ring-shaped and touch the surfaces to be sealed below elastic pre-tension. The spring 26 is annular and consists in this embodiment of a polymeric material. Regarding a low weight of the sealing arrangement is one Design of advantage to be emphasized. The elastomeric material of the Sealing body 24 is during its manufacture with the spring 26 by vulcanization connected. In that the spring 26 and the sealing body 24 in one piece are merged into each other, is a jumping out of the Spring 26 excluded from the sleeve 14 during assembly. The unit, consisting of the spring 26 and the sealing body 24 is thus within the Sleeve 14 placed that the spring 26, the support wall 18 directly adjacent touched. The sealing body 24 is sealed within with elastic prestress the sleeve 14 arranged. The sealing arrangement according to the invention brings about an exact concentric assignment of sleeve 14, sealing body 24 and valve stem 12 to each other. For good performance during a long period Service life, this is a noteworthy advantage.

    In Figur 3 ist die Hülse 14 als Einzelteil in geschnittener Darstellung gezeigt. Es ist zu erkennen, daß in diesem Ausführungsbeispiel vier sich in axialer Richtung erstreckende Haltekrallen 36 vorgesehen sind, die einander in Umfangsrichtung mit Abstand benachbart zugeordnet und gleichmäßig in Umfangsrichtung verteilt angeordnet sind. Hierbei ist von Vorteil, daß die gesamte Lageranordnung durch eine derartige Ausgestaltung ein vergleichsweise geringes Gewicht aufweist und erhebliche Materialeinsparungen möglich sind.In Figure 3, the sleeve 14 is shown as a single part in a sectional view. It it can be seen that in this embodiment four are in the axial direction extending holding claws 36 are provided which are mutually circumferential spaced adjacent and even in the circumferential direction are distributed. The advantage here is that the entire bearing arrangement a comparatively low weight due to such a design and significant material savings are possible.

    In Figur 4 sind die Hülse 14 sowie die mit dem Dichtkörper 24 verbundene Feder 26 gezeigt, die zu einer Einheit verbunden werden. Zunächst wird der Dichtkörper 24 in die Hülse 14 montiert, so daß sich eine vormontierbare Einheit ergibt, die anschließend zur Dichtungsanordnung komplettiert wird. Dazu wird die vormontierbare Einheit mit der Ventilführung 38 verbunden und die Ventilfeder 16 derart montiert, daß sich diese am Flansch 20 abstützt.In Figure 4, the sleeve 14 and the spring connected to the sealing body 24 26 shown, which are connected to form a unit. First, the Sealing body 24 mounted in the sleeve 14, so that there is a preassembled unit results, which is then completed to the sealing arrangement. To the preassembled unit is connected to the valve guide 38 and the Valve spring 16 mounted such that it is supported on the flange 20.

    Um die zylindrische Hülse 14 und den Dichtköper 24 an der Ventilführung 38 zu sichern, besteht beispielsweise die Möglichkeit, diese Teile durch Punktschweißen oder andere Verbindungstechniken zu verbinden.Around the cylindrical sleeve 14 and the sealing body 24 on the valve guide 38 secure, there is the possibility, for example, of these parts by spot welding or to connect other connection techniques.

    Claims (8)

    1. A valve-stem seal (10) in an internal combustion engine, comprising a sleeve (14) made from high-viscosity material, with a first and a second end face, the sleeve (14) having, on its first end face, a flange (20) extending radially outwards and, on the axially opposite second end face, a supporting wall (18) extending radially inwards, the flange (20) forming the abutment for a valve spring (16), an annular sealing body (24), which sealingly surrounds a valve stem (12), being in sealing contact by means of a press fit with the inner circumference of the sleeve (14) and with the supporting wall (18), and the sealing body (24) having at least one annular first sealing lip (28), characterized in that the sealing body (24) is connected to a supporting body, in that the supporting body is designed as a prestressed spring (26) for pressing at least the annular first sealing lip (28) onto the valve stem, and in that the spring (26) is supported directly on the supporting wall (18).
    2. A valve-stem seal according to claim 1, characterized in that the sealing body (24) consists of elastomeric material.
    3. A valve-stem seal according to either one of claims 1 and 2, characterized in that the sealing body (24) has a second sealing lip (34) on that end face of the sealing body (24) which faces away from the spring (26), and in that the second sealing lip (34) is in sealing engagement with the end-face boundary of a valve guide (38).
    4. A valve-stem seal according to any one of claims 1 to 3, characterized in that the sleeve (14) has at least two axially extending holding claws (36) which circumferentially surround the sealing body (24) and which are associated with one another in the circumferential direction, so as to be adjacent to one another with clearance, and are arranged so as to be distributed uniformly in the circumferential direction, and in that the supporting wall (18) is formed by the holding claws (26).
    5. A valve-stem seal according to any one of claims 1 to 4, characterised in that the sleeve (14) consists of a metallic or polymeric material.
    6. A valve-stem seal according to any one of claims 1 to 5, characterized in that the spring (26) consists of a polymeric or metallic material.
    7. A valve-stem seal according to any one of claims 1 to 6, characterized in that the sleeve (14) has a radial offset (30) in the axial direction between the supporting wall (18) and the flange (20).
    8. A valve-stem seal according to any one of claims 1 to 7, characterized in that the spring (26) has an essentially L-shaped cross section, and in that the essentially axially extending leg of the spring (26) completely covers the first sealing lip (28) in the axial direction.
    EP96113464A 1995-11-14 1996-08-22 Valve stem sealing arrangement Expired - Lifetime EP0774568B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    US08/557,459 US5558056A (en) 1995-11-14 1995-11-14 Two-piece valve stem seal
    US557459 1995-11-14

    Publications (2)

    Publication Number Publication Date
    EP0774568A1 EP0774568A1 (en) 1997-05-21
    EP0774568B1 true EP0774568B1 (en) 2002-02-20

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    ID=24225493

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96113464A Expired - Lifetime EP0774568B1 (en) 1995-11-14 1996-08-22 Valve stem sealing arrangement

    Country Status (9)

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    US (1) US5558056A (en)
    EP (1) EP0774568B1 (en)
    JP (1) JPH09177522A (en)
    KR (1) KR100238502B1 (en)
    CN (1) CN1159506A (en)
    AT (1) ATE213521T1 (en)
    BR (1) BR9605566A (en)
    CA (1) CA2176662A1 (en)
    DE (1) DE59608757D1 (en)

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    Also Published As

    Publication number Publication date
    ATE213521T1 (en) 2002-03-15
    KR100238502B1 (en) 2000-01-15
    CN1159506A (en) 1997-09-17
    JPH09177522A (en) 1997-07-08
    KR970027655A (en) 1997-06-24
    EP0774568A1 (en) 1997-05-21
    BR9605566A (en) 1998-08-18
    DE59608757D1 (en) 2002-03-28
    US5558056A (en) 1996-09-24
    CA2176662A1 (en) 1997-05-15

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