EP1633957A1 - Valve stem seal for internal combustion engines - Google Patents

Valve stem seal for internal combustion engines

Info

Publication number
EP1633957A1
EP1633957A1 EP04718203A EP04718203A EP1633957A1 EP 1633957 A1 EP1633957 A1 EP 1633957A1 EP 04718203 A EP04718203 A EP 04718203A EP 04718203 A EP04718203 A EP 04718203A EP 1633957 A1 EP1633957 A1 EP 1633957A1
Authority
EP
European Patent Office
Prior art keywords
valve stem
sealing part
stem seal
ring
support ring
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
EP04718203A
Other languages
German (de)
French (fr)
Other versions
EP1633957B1 (en
Inventor
Massimo Martelli
Stefano Bermond
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 EP1633957A1 publication Critical patent/EP1633957A1/en
Application granted granted Critical
Publication of EP1633957B1 publication Critical patent/EP1633957B1/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
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/32—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for rotating lift valves, e.g. to diminish wear
    • 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
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L1/462—Valve return spring arrangements
    • 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
    • F01L2301/00—Using particular materials

Definitions

  • the invention relates to a valve stem seal for internal combustion engines with a dynamic sealing part resting on a valve stem and a static sealing part resting on a valve guide made of elastomeric materials, the static sealing part being surrounded by a dimensionally stable stiffening ring.
  • Valve stem seals of this type have many uses.
  • the modern valve stem seals have a dynamic seal, which seals the valve stem.
  • the seal is intended to prevent lubricant from getting into the combustion chamber of the internal combustion engine along the valve stem.
  • the static seal lies against the valve stem guide and serves as a fastening part for the dynamic seal.
  • DE 100 28 587 A1 shows a valve train for an internal combustion engine which is provided with a static and a dynamic seal which forms a preassembled unit.
  • the static seal is surrounded by a support body or stiffening ring, which has a radially outwardly extending flange on which the valve spring is supported.
  • valve stem seal of a comparable design is also shown in DE 39 02 518 A1.
  • a wear-resistant valve spring support is arranged on the spring side of this radially bent leg in this valve stem seal.
  • the valve spring support can be designed as an annular disc, which consists of hardened steel. It is advantageous to firmly connect the disc to the tubular body that surrounds the static seal in order to create an installation unit in this way.
  • On the inner circumference of the disc radially inwardly extending tongues are arranged, which are firmly connectable with their radially inner end region to the outer circumference of the tubular body.
  • the disadvantage of this solution is that the valve spring and thus also the valve tappet with the valve disk cannot move freely. The spring works its way into the flange or the annular disk and is thereby prevented from rotating.
  • the invention has for its object to provide a valve stem seal, which enables free rotation of the valve head on the valve seat. This ensures a uniform contact between these parts reached, which in turn leads to a higher compression within the cylinder.
  • valve stem seal of the type mentioned at the outset in that a support ring is provided which is separate from the stiffening ring of the static sealing part and which permits free rotation of the valve spring and the valve spring plate including the valve spring head.
  • the valve stem seal is intended to represent a preassembled unit and for this reason it is advantageous if the support ring is connected to the valve spring during assembly, for example by gluing. Only after assembly the valve stem seal on the cylinder head of the engine should the support ring be released from the valve spring.
  • a particularly advantageous embodiment is achieved in that the support ring and the stiffening ring are initially combined to form a unit and are only separated from the support ring after the valve stem seal has been installed.
  • This is achieved in that the support ring in the form of a support ring is first connected to the stiffening ring via at least one predetermined breaking point, that is to say represents a unit. During assembly, the support ring can be broken off from the stiffening ring by applying the appropriate pressure.
  • the predetermined breaking point it is also possible to design the predetermined breaking point in such a way that it only breaks after the internal combustion engine has been started up and then releases the support ring.
  • the support ring is rotatably placed on a flange of the reinforcement ring which is integrally directed outward with the reinforcement ring and is in contact with the cylinder head.
  • this ring is pressed against the flange by the spring, so that the spring ring and flange with associated stiffening ring are to be considered as belonging to the valve stem unit.
  • the flange with the support ring or the support ring alone can be inserted in a recess in the cylinder head. This counteracts a displacement of the support ring, particularly if the inner diameter of the support ring is relatively large.
  • the positioning of the static sealing part is carried out on the end face of the valve stem guide. This facilitates the assembly of the individual parts.
  • the static sealing part can be provided with an axial ring surface for contact with the end face of the valve stem guide.
  • the stiffening ring has an angle or S shape, the inwardly directed leg being located at the transition to the sealing lip and being encompassed by the elastomer material of the sealing element.
  • the part of the stiffening ring lying in the longitudinal direction of the valve stem guide is connected to the elastomer material of the sealing part essentially over the entire length of its inner surface.
  • the valve stem guide consists of a tube with a constant inside and outside diameter over its entire length.
  • Figure 1 shows a valve stem seal in longitudinal section with indicated
  • Figure 2 shows the valve stem seal according to Figure 1 after breaking off the support ring
  • Figure 3 shows a longitudinal section through a valve stem seal with a separate support ring on the flange of the stiffening ring
  • valve stem seal 1 shows the left side of a valve stem seal 1 in longitudinal section.
  • the valve stem with valve head and valve plate are omitted for the sake of clarity.
  • the valve stem seal 1 consists of the dynamic sealing part 2 which is in contact with the valve stem and which is formed from an elastomeric material and has the sealing lip 3.
  • the sealing lip 3 is pressed against the valve stem by a helical spring 4.
  • the valve stem itself is guided in the valve stem guide 5.
  • the static sealing part 6 of the seal is placed on the valve stem guide 5.
  • the static seal 6 is surrounded by the stiffening ring 7 made of metal.
  • the stiffening ring 7 is S-shaped and its inwardly directed leg 9, which lies at the transition to the sealing lip 3, is encompassed by the elastomer material of the sealing part 2.
  • the stiffening ring 7 is provided with a step-like and radially outwardly directed flange 10.
  • the flange 10 is supported on the
  • the flange 10 in turn rests on the cylinder head 12 of the internal combustion engine.
  • the flange 10 is preferably at the point 13 Provide a predetermined breaking point, which results in a separation of the outermost flange part from the stiffening ring 7 during the assembly of the valve stem seal 1 or after a short start-up of the internal combustion engine.
  • the separated flange part represents the support ring 14 for the valve spring 11, which can rotate with the spring 11 independently of the stiffening ring 7. With 15 two further predetermined breaking points are indicated, of which one can take the place of the predetermined breaking point 13.
  • the predetermined breaking point 13 is preferred.
  • FIG. 2 shows the right side of the valve stem seal according to FIG. 1 after the support ring 14 has been separated from the stiffening ring 7. The two parts are then independent of one another. So that a displacement of the support ring 14 with respect to the stiffening ring or the valve stem guide 5 does not occur, there is a recess 16 in the cylinder head 12, which radially encompasses the support ring 14 or its outer edge.
  • Figure 3 shows an embodiment in longitudinal section in which the basic structure of the valve stem seal 1, as shown in Figures 1 and 2, is retained. Deviating is the design of the stiffening body 7, which has been designed without predetermined breaking points.
  • the outer flange part 10 of the stiffening body 7 is equipped with a separate support ring 20, which rests on the flange which is integrally connected to the stiffening ring 7 and faces outwards and lies against the cylinder head 12.
  • the support ring 20 is rotatably arranged and made of a high-strength material in contrast to the stiffening ring 7, which can be made of a cheaper material.
  • the bearing ring 20 lying loosely on the flange 10 can rotate freely with the spring 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

The invention relates to a valve stem seal for internal combustion engines, comprising a dynamic sealing part applied to a valve stem, and a static sealing part which consists of elastomer materials and is applied to the valve stem guide, said static sealing part being surrounded by a dimensionally stable reinforcing body. The inventive seal is characterised by a bearing ring (14,20) that is separate from the reinforcing ring (7) of the static sealing part (6) and enables a free rotational movement of the valve spring (11) and the valve spring retainer.

Description

Ventilschaftabdichtung für Brennkraftmaschinen Valve stem seals for internal combustion engines
Beschreibungdescription
Die Erfindung befasst sich mit einer Ventilschaftabdichtung für Brennkraftmaschinen mit einem an einem Ventilschaft anliegenden dynamischen Dichtteil und einem an einer Ventilführung anliegenden statischen Dichtteil aus elastomeren Werkstoffen, wobei das statische Dichtteil von einem formstabilen Versteifungsring umgeben ist.The invention relates to a valve stem seal for internal combustion engines with a dynamic sealing part resting on a valve stem and a static sealing part resting on a valve guide made of elastomeric materials, the static sealing part being surrounded by a dimensionally stable stiffening ring.
Technisches GebietTechnical field
Ventilschaftabdichtungen dieser Art haben eine vielseitige Verwendung. Die modernen Ventilschaftabdichtungen haben eine dynamische Dichtung, welche den Ventilschaft dichtend umschließt. Die Dichtung soll verhindern, dass Schmiermittel am Ventilschaft entlang in den Brennraum der Brennkraftmaschine gelangt. Sie soll jedoch nicht 100%ig dicht sein, damit eine geringe Menge an Öl zur Schmierung des Ventilschafts hindurchtreten kann. Die statische Dichtung liegt an der Ventilschaftführung an und dient als Befestigungsteil für die dynamische Dichtung. Stand der TechnikValve stem seals of this type have many uses. The modern valve stem seals have a dynamic seal, which seals the valve stem. The seal is intended to prevent lubricant from getting into the combustion chamber of the internal combustion engine along the valve stem. However, it should not be 100% tight so that a small amount of oil can pass through to lubricate the valve stem. The static seal lies against the valve stem guide and serves as a fastening part for the dynamic seal. State of the art
In der DE 100 28 587 A1 ist ein Ventiltrieb für eine Verbrennungskraftmaschine gezeigt, die mit einer statischen und einer dynamischen Dichtung versehen ist, die eine vormontierte Einheit bildet. Die statische Dichtung ist von einem Stützkörper oder auch Versteifungsring umgeben, der einen radial nach außen sich erstreckenden Flansch hat auf dem die Ventilfeder sich abstützt.DE 100 28 587 A1 shows a valve train for an internal combustion engine which is provided with a static and a dynamic seal which forms a preassembled unit. The static seal is surrounded by a support body or stiffening ring, which has a radially outwardly extending flange on which the valve spring is supported.
Auch in der DE 39 02 518 A1 ist eine Ventilschaftabdichtung vergleichbarer Bauart gezeigt. Um zu einer besseren Maßgenauigkeit bei der Herstellung der Ventilschaftabdichtung zu gelangen und auch gleichzeitig die Herstellungskosten zu senken ist bei dieser Ventilschaftabdichtung am radial abgebogenen Schenkel federseitig eine verschleißfeste Ventilfederauflage angeordnet. Die Ventilfederauflage kann als ringförmige Scheibe ausgebildet sein, die aus gehärtetem Stahl besteht. Dabei ist es vorteilhaft, die Scheibe fest mit dem Rohrkörper zu verbinden, welcher die statische Dichtung umgibt, um auf diese Weise eine Einbaueinheit zu schaffen. Am Innenumfang der Scheibe sind radial nach innen sich erstreckende Zungen angeordnet, die mit ihrem radial inneren Endbereich mit dem Außenumfang des Rohrkörpers fest verbindbar sind. Nachteil dieser Lösung ist, dass die Ventilfeder und damit auch der Ventilstößel mit Ventilteller sich nicht frei bewegen können. Die Feder arbeitet sich in den Flansch bzw. die ringförmige Scheibe ein und wird dadurch an ihrer Drehbewegung gehindert.A valve stem seal of a comparable design is also shown in DE 39 02 518 A1. In order to achieve a better dimensional accuracy in the manufacture of the valve stem seal and at the same time to reduce the manufacturing costs, a wear-resistant valve spring support is arranged on the spring side of this radially bent leg in this valve stem seal. The valve spring support can be designed as an annular disc, which consists of hardened steel. It is advantageous to firmly connect the disc to the tubular body that surrounds the static seal in order to create an installation unit in this way. On the inner circumference of the disc radially inwardly extending tongues are arranged, which are firmly connectable with their radially inner end region to the outer circumference of the tubular body. The disadvantage of this solution is that the valve spring and thus also the valve tappet with the valve disk cannot move freely. The spring works its way into the flange or the annular disk and is thereby prevented from rotating.
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt die Aufgabe zugrunde, eine Ventilschaftabdichtung zu schaffen, welche eine freie Drehbewegung des Ventilkopfes am Ventilsitz ermöglicht. Dadurch wird ein gleichmäßiger Kontakt dieser Teile zueinander erreicht, was seinerseits zu einer höheren Kompression innerhalb des Zylinders führt.The invention has for its object to provide a valve stem seal, which enables free rotation of the valve head on the valve seat. This ensures a uniform contact between these parts reached, which in turn leads to a higher compression within the cylinder.
Die Lösung der gestellten Aufgabe wird bei einer Ventilschaftabdichtung der eingangs genannten Art erfindungsgemäß dadurch erreicht, dass ein von dem Versteifungsring des statischen Dichtteils separater Auflagering vorgesehen ist, der eine freie Drehbewegung der Ventilfeder und des Ventilfedertellers einschließlich des Ventilfederkopfes erlaubt. Die Ventilschaftabdichtung soll eine vormontierte Einheit darstellen und aus diesem Grunde ist es günstig, wenn der Auflagering während der Montage mit der Ventilfeder beispielsweise durch Kleben verbunden ist. Erst nach der Montage soll der Ventilschaftabdichtung am Zylinderkopf des Motors soll sich der Auflagering von der Ventilfeder lösen.The solution to the stated problem is achieved according to the invention in a valve stem seal of the type mentioned at the outset in that a support ring is provided which is separate from the stiffening ring of the static sealing part and which permits free rotation of the valve spring and the valve spring plate including the valve spring head. The valve stem seal is intended to represent a preassembled unit and for this reason it is advantageous if the support ring is connected to the valve spring during assembly, for example by gluing. Only after assembly the valve stem seal on the cylinder head of the engine should the support ring be released from the valve spring.
Eine besonders vorteilhafte Ausbildung wird dadurch erreicht, dass der Auflagering mit dem Versteifungsring zunächst zu einer Einheit zusammengefasst sind und erst nach der Montage der Ventilschaftabdichtung vom Auflagering separiert wird. Dieses wird dadurch erreicht, dass der Auflagering in Form eines Stützrings zunächst über wenigstens eine Sollbruchstelle mit dem Versteifungsring verbunden ist, das heißt eine Einheit darstellt. Während der Montage kann der Auflagering durch entsprechend angewendeten Druck vom Versteifungsring abgebrochen werden. Möglich ist aber auch die Sollbruchstelle so auszuführen, dass sie erst nach Inbetriebnahme der Brennkraftmaschine bricht und dann den Auflagering freigibt.A particularly advantageous embodiment is achieved in that the support ring and the stiffening ring are initially combined to form a unit and are only separated from the support ring after the valve stem seal has been installed. This is achieved in that the support ring in the form of a support ring is first connected to the stiffening ring via at least one predetermined breaking point, that is to say represents a unit. During assembly, the support ring can be broken off from the stiffening ring by applying the appropriate pressure. However, it is also possible to design the predetermined breaking point in such a way that it only breaks after the internal combustion engine has been started up and then releases the support ring.
Eine andere Möglichkeit sieht vor den Auflagering verdrehbar auf einem mit dem Versteifungsring integral nach außen gerichteten und am Zylinderkopf anliegenden Flansch des Versteifungsrings aufgelegt wird. Für Montagezwecke wird dieser Ring durch die Feder an den Flansch gedrückt, so dass Federring und Flansch mit zugehörigem Versteifungsring zu der Ventilschafteinheit zugehörig zu betrachten sind.Another possibility provides for the support ring to be rotatably placed on a flange of the reinforcement ring which is integrally directed outward with the reinforcement ring and is in contact with the cylinder head. For assembly purposes, this ring is pressed against the flange by the spring, so that the spring ring and flange with associated stiffening ring are to be considered as belonging to the valve stem unit.
Der Flansch mit Auflagering bzw. der Auflagering allein kann in einer Vertiefung im Zylinderkopf eingefügt sein. Dadurch wird, insbesondere wenn der Innendurchmesser des Auflagerings relativ groß ist, einer Verlagerung des Auflagerings entgegengewirkt.The flange with the support ring or the support ring alone can be inserted in a recess in the cylinder head. This counteracts a displacement of the support ring, particularly if the inner diameter of the support ring is relatively large.
In Weiterführung der Erfindung ist es vorteilhaft, wenn die Positionierung des statischen Dichtteils an der Stirnfläche der Ventilschaftführung erfolgt. Dieses erleichtert die Montage der einzelnen Teile. Das statische Dichtteil kann für die Anlage an der Stirnfläche der Ventilschaftführung mit einer Axialringfläche versehen sein.In a continuation of the invention, it is advantageous if the positioning of the static sealing part is carried out on the end face of the valve stem guide. This facilitates the assembly of the individual parts. The static sealing part can be provided with an axial ring surface for contact with the end face of the valve stem guide.
Der Versteifungsring hat im Längsschnitt gesehen eine Winkel- oder S-Form, wobei der nach innen gerichtete Schenkel am Übergang zur Dichtlippe liegt und von dem Elastomermaterial des Dichtelements umfasst ist. Der in Längsrichtung der Ventilschaftführung liegende Teil des Versteifungsrings ist im Wesentlichen über die gesamte Länge seiner Innenfläche mit dem Elastomermaterial des Dichtteils verbunden. Desweiteren ist es günstig, wenn die Ventilschaftführung aus einem Rohr mit auf seiner gesamten Länge konstanten Innen- und Außendurchmesser besteht.Seen in longitudinal section, the stiffening ring has an angle or S shape, the inwardly directed leg being located at the transition to the sealing lip and being encompassed by the elastomer material of the sealing element. The part of the stiffening ring lying in the longitudinal direction of the valve stem guide is connected to the elastomer material of the sealing part essentially over the entire length of its inner surface. Furthermore, it is advantageous if the valve stem guide consists of a tube with a constant inside and outside diameter over its entire length.
Kurzbeschreibung der ZeichnungBrief description of the drawing
Anhand zweier in der Zeichnung dargestellter Ausführungsbeispiele wird die Erfindung nachstehend näher erläutert.The invention is explained in more detail below with the aid of two exemplary embodiments shown in the drawing.
Es zeigt: Figur 1 eine Ventilschaftabdichtung im Längsschnitt mit angedeutetenIt shows: Figure 1 shows a valve stem seal in longitudinal section with indicated
Sollbruchstellen,Predetermined breaking points,
Figur 2 die Ventilschaftabdichtung nach Figur 1 nach Abbrechen des Auflagerings undFigure 2 shows the valve stem seal according to Figure 1 after breaking off the support ring and
Figur 3 einen Längsschnitt durch eine Ventilschaftabdichtung mit einem gesonderten Auflagering auf dem Flansch des VersteifungsringsFigure 3 shows a longitudinal section through a valve stem seal with a separate support ring on the flange of the stiffening ring
Ausführung der ErfindungImplementation of the invention
In der Figur 1 ist im Längsschnitt die linke Seite einer Ventilschaftabdichtung 1 dargestellt. Dabei sind der Ventilschaft mit Ventilkopf und Ventilteller der Übersichtlichkeit halber weggelassen. Die Ventilschaftabdichtung 1 besteht aus dem am Ventilschaft anliegenden dynamischen Dichtteil 2 der aus einem elastomeren Werkstoff gebildet ist und die Dichtlippe 3 hat. Die Dichtlippe 3 wird durch eine Schraubenfeder 4 an den Ventilschaft angedrückt. Der Ventilschaft selbst ist in der Ventilschaftführung 5 geführt. Auf die Ventilschaftführung 5 ist der statische Dichtteil 6 der Dichtung aufgesetzt. Die statische Dichtung 6 wird von dem Versteifungsring 7 aus Metall umfasst. Zur Positionierung des statischen Dichtteils 6 an der Stirnfläche 8 der Ventilschaftführung 5 ist der statische Dichtteil 6 mit einer axialen Ringfläche versehen. Der Versteifungsring 7 ist S-förmig ausgebildet und sein nach innen gerichteter Schenkel 9, der am Übergang zur Dichtlippe 3 liegt, ist von dem Elastomermaterial des Dichtteils 2 umfasst.1 shows the left side of a valve stem seal 1 in longitudinal section. The valve stem with valve head and valve plate are omitted for the sake of clarity. The valve stem seal 1 consists of the dynamic sealing part 2 which is in contact with the valve stem and which is formed from an elastomeric material and has the sealing lip 3. The sealing lip 3 is pressed against the valve stem by a helical spring 4. The valve stem itself is guided in the valve stem guide 5. The static sealing part 6 of the seal is placed on the valve stem guide 5. The static seal 6 is surrounded by the stiffening ring 7 made of metal. To position the static sealing part 6 on the end face 8 of the valve stem guide 5, the static sealing part 6 is provided with an axial ring surface. The stiffening ring 7 is S-shaped and its inwardly directed leg 9, which lies at the transition to the sealing lip 3, is encompassed by the elastomer material of the sealing part 2.
Der Versteifungsring 7 ist mit einem treppenartig ausgebildeten und radial nach außen gerichteten Flansch 10 versehen. Auf dem Flansch 10 stützt sich dieThe stiffening ring 7 is provided with a step-like and radially outwardly directed flange 10. The flange 10 is supported on the
Feder 11 ab. Der Flansch 10 liegt seinerseits auf dem Zylinderkopf 12 der Brennkraftmaschine auf. Der Flansch 10 wird bevorzugt an der Stelle 13 mit einer Sollbruchstelle versehen, welche eine Trennung des äußersten Flanschteils von dem Versteifungsring 7 während der Montage der Ventilschaftabdichtung 1 oder auch nach kurzer Inbetriebnahme der Brennkraftmaschine ergibt. Der abgetrennte Flanschteil stellt den Auflagering 14 für die Ventilfeder 11 dar, der unabhänig vom Versteifungsring 7 sich mit der Feder 11 verdrehen kann. Mit 15 sind zwei weitere Sollbruchstellen angedeutet, von denen jeweils eine an die Stelle der Sollbruchstelle 13 treten kann. Die Sollbruchstelle 13 wird jedoch bevorzugt.Spring 11 off. The flange 10 in turn rests on the cylinder head 12 of the internal combustion engine. The flange 10 is preferably at the point 13 Provide a predetermined breaking point, which results in a separation of the outermost flange part from the stiffening ring 7 during the assembly of the valve stem seal 1 or after a short start-up of the internal combustion engine. The separated flange part represents the support ring 14 for the valve spring 11, which can rotate with the spring 11 independently of the stiffening ring 7. With 15 two further predetermined breaking points are indicated, of which one can take the place of the predetermined breaking point 13. The predetermined breaking point 13 is preferred.
In der Figur 2 ist die rechte Seite der Ventilschaftabdichtung nach Figur 1 gezeigt nachdem der Auflagering 14 von dem Versteifungsring 7 abgetrennt wurde. Beide Teile sind sodann unabhängig voneinander. Damit eine Verschiebung des Auflagerings 14 in Bezug zum Versteifungsring bzw. zur Ventilschaftführung 5 nicht eintritt, ist im Zylinderkopf 12 eine Vertiefung 16 vorhanden, welche den Auflagering 14 bzw. dessen Außenrand radial umfasst.FIG. 2 shows the right side of the valve stem seal according to FIG. 1 after the support ring 14 has been separated from the stiffening ring 7. The two parts are then independent of one another. So that a displacement of the support ring 14 with respect to the stiffening ring or the valve stem guide 5 does not occur, there is a recess 16 in the cylinder head 12, which radially encompasses the support ring 14 or its outer edge.
Die Figur 3 zeigt ein Ausführungsbeispiel im Längsschnitt bei dem der prinzipielle Aufbau der Ventilschaftabdichtung 1 , wie er in den Figuren 1 und 2 gezeigt wurde, beibehalten ist. Abweichend ist die Ausbildung des Versteifungskörpres 7, der ohne Sollbruchstellen ausgeführt worden ist. Dafür ist der äußere Flanschteil 10 des Versteifungskörpers 7 mit einem separaten Auflagering 20 ausgestattet, der auf dem mit dem Versteifungsring 7 integral verbundenen nach außen gerichteten und am Zylinderkopf 12 anliegenden Flansch aufliegt. Der Auflagering 20 ist dabei verdrehbar angeordnet und aus einem hochfesten Material im Gegensatz zum Versteifungsring 7, der aus einem preisgünstigeren Material gefertigt werden kann. Der lose auf dem Flansch 10 aufliegende Auflagering 20 kann sich mit der Feder 11 frei verdrehen. Figure 3 shows an embodiment in longitudinal section in which the basic structure of the valve stem seal 1, as shown in Figures 1 and 2, is retained. Deviating is the design of the stiffening body 7, which has been designed without predetermined breaking points. For this purpose, the outer flange part 10 of the stiffening body 7 is equipped with a separate support ring 20, which rests on the flange which is integrally connected to the stiffening ring 7 and faces outwards and lies against the cylinder head 12. The support ring 20 is rotatably arranged and made of a high-strength material in contrast to the stiffening ring 7, which can be made of a cheaper material. The bearing ring 20 lying loosely on the flange 10 can rotate freely with the spring 11.

Claims

Patentansprüche claims
1. Ventilschaftabdichtung für Brennkraftmaschinen mit einem an einem Ventilschaft anliegenden dynamischen Dichtteil und einem an der Ventilschaftführung anliegenden statischen Dichtteil aus elastomeren1. Valve stem seal for internal combustion engines with a dynamic sealing part resting against a valve stem and a static sealing part made of elastomeric against the valve stem guide
Werkstoffen, wobei das statische Dichtteil von einem formstabilen Versteifungskörper umgeben ist, gekennzeichnet durch einen von dem Versteifungsring (7) des statischen Dichtteils (6) separaten Auflagering (14, 20), der eine freie Drehbewegung der Ventilfeder (11) und des Ventilfedertellers erlaubt.Materials, the static sealing part being surrounded by a dimensionally stable stiffening body, characterized by a support ring (14, 20) which is separate from the stiffening ring (7) of the static sealing part (6) and which allows the valve spring (11) and the valve spring plate to rotate freely.
2. Ventilschaftabdichtung für Brennkraftmaschinen mit einem an einem Ventilschaft anliegenden dynamischen Dichtteil und einem an der Ventilschaftführung anliegenden statischen Dichtteil aus elastomeren Werkstoffen, wobei das statische Dichtteil von einem formstabilen2. Valve stem seal for internal combustion engines with a dynamic sealing part resting on a valve stem and a static sealing part made of elastomeric materials resting on the valve stem guide, the static sealing part having a dimensionally stable shape
Versteifungsring umgeben ist, gekennzeichnet durch einen von dem Versteifungsring (7) des statischen Dichtteils (6) während oder nach der Montage der Ventilschaftabdichtung am Zylinderkopf (12) des Motors separierbaren Auflagering (14).Stiffening ring is surrounded, characterized by a support ring (14) which can be separated from the stiffening ring (7) of the static sealing part (6) during or after assembly of the valve stem seal on the cylinder head (12) of the engine.
Ventilschaftabdichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Auflagering (14) in der Form eines Stützrings über wenigstens eine Sollbruchstelle (13) mit dem Versteifungsring 7 verbunden ist.Valve stem seal according to one of claims 1 or 2, characterized in that the support ring (14) in the form of a support ring is connected to the stiffening ring 7 via at least one predetermined breaking point (13).
Ventilschaftabdichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass der Auflagering (20) verdrehbar auf einem mit dem Versteifungsring (7) integral verbundenen nach außen gerichteten und am Zylinderkopf anliegenden Flansch (10) aufliegt. Valve stem seal according to one of claims 1 or 2, characterized in that the bearing ring (20) rotatably rests on an outwardly directed flange (10) which is connected to the stiffening ring (7) and is in contact with the cylinder head.
5. Ventilschaftabdichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Flansch (10) mit Auflagering (20) bzw. der Auflagering (14) in einer Vertiefung (16) im Zylinderkopf (12) eingefügt sind.5. Valve stem seal according to one of claims 1 to 4, characterized in that the flange (10) with support ring (20) or the support ring (14) are inserted in a recess (16) in the cylinder head (12).
6. Ventilschaftabdichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Positionierung des Dichtteils (6) an der Stirnfläche (8) der Ventilschaftführung (5) erfolgt.6. Valve stem seal according to one of claims 1 to 5, characterized in that the positioning of the sealing part (6) on the end face (8) of the valve stem guide (5).
7. Ventilschaftabdichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das statische Dichtteil (6) mit einer axialen Ringfläche für die Anlage an der Stirnseite (8) der Ventilschaftführung (5) versehen ist.7. Valve stem seal according to one of claims 1 to 6, characterized in that the static sealing part (6) is provided with an axial annular surface for contact with the end face (8) of the valve stem guide (5).
8. Ventilschaftabdichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Versteifungsring (7) im Längsschnitt gesehen eine Winkel- oder S-Form hat, wobei der nach innen gerichtete Schenkel (9) am Übergang zur Dichtlippe (3) liegt und vom Elastomermaterial (13) des Dichtteils (2) umfasst ist.8. Valve stem seal according to one of claims 1 to 7, characterized in that the stiffening ring (7) seen in longitudinal section has an angle or S shape, the inward leg (9) at the transition to the sealing lip (3) and is encompassed by the elastomer material (13) of the sealing part (2).
9. Ventilschaftabdichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der in Längsrichtung der Ventilschaftführung (5) liegende Teil des Versteifungsrings (3) im Wesentlichen über die Gesamte Länge seiner Innenfläche (16) mit dem Elastomermaterial (13) des Dichtteils (2) verbunden ist9. Valve stem seal according to one of claims 1 to 8, characterized in that the part of the stiffening ring (3) lying in the longitudinal direction of the valve stem guide (5) essentially over the entire length of its inner surface (16) with the elastomer material (13) of the sealing part ( 2) is connected
10. Ventilschaftabdichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Ventilschaftführung 85) aus einem Rohr mit auf seiner gesamten Länge konstanten Innen- und Außendurchmesser (d, D) besteht. 10. Valve stem seal according to one of claims 1 to 9, characterized in that the valve stem guide 85) consists of a tube with constant inside and outside diameter (d, D) over its entire length.
EP04718203A 2003-06-05 2004-03-06 Valve stem seal for internal combustion engines Expired - Lifetime EP1633957B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10325764A DE10325764B3 (en) 2003-06-05 2003-06-05 Valve stem seal for internal combustion engines
PCT/EP2004/002324 WO2004109067A1 (en) 2003-06-05 2004-03-06 Valve stem seal for internal combustion engines

Publications (2)

Publication Number Publication Date
EP1633957A1 true EP1633957A1 (en) 2006-03-15
EP1633957B1 EP1633957B1 (en) 2009-09-30

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Application Number Title Priority Date Filing Date
EP04718203A Expired - Lifetime EP1633957B1 (en) 2003-06-05 2004-03-06 Valve stem seal for internal combustion engines

Country Status (3)

Country Link
EP (1) EP1633957B1 (en)
DE (2) DE10325764B3 (en)
WO (1) WO2004109067A1 (en)

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Also Published As

Publication number Publication date
DE502004010167D1 (en) 2009-11-12
DE10325764B3 (en) 2005-08-04
EP1633957B1 (en) 2009-09-30
WO2004109067A1 (en) 2004-12-16

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