EP0075702A1 - Sealing ring with a sealing lip, especially for valve stems - Google Patents

Sealing ring with a sealing lip, especially for valve stems Download PDF

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Publication number
EP0075702A1
EP0075702A1 EP82107353A EP82107353A EP0075702A1 EP 0075702 A1 EP0075702 A1 EP 0075702A1 EP 82107353 A EP82107353 A EP 82107353A EP 82107353 A EP82107353 A EP 82107353A EP 0075702 A1 EP0075702 A1 EP 0075702A1
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EP
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Prior art keywords
stiffening
lip
cylinder
sealing
sealing ring
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EP82107353A
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German (de)
French (fr)
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EP0075702B1 (en
Inventor
Paul Vossieck
Hans Deuring
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Cessione goetze Elastomere GmbH
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Goetze GmbH
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    • 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 invention relates to a lip seal ring, in particular a valve stem seal for internal combustion engines, consisting of an elastic material with a preferably spring-loaded sealing lip part, a cylindrical stiffening ring made of metal or another material and a starting point of the assembly stamp formed by the stiffening ring.
  • Valve stem rings with or without spring-loaded sealing lips are attached to the valve guides using clamps, springs, metal and / or hard material rings or vulcanized-in metal stiffening rings.
  • the sealing part is pressed onto the valve guide using a cylindrical assembly plunger.
  • the stiffening ring has protrusions that protrude radially outwards so that the assembly stamp can engage the sealing ring.
  • Valve stem seals are already known, on the stiffening rings of which holding and mounting flanges are attached. According to DE-OS 1 550 247, it is known, for example, to bend the stiffening ring radially inwards in the region between the holding part and the sealing lip part, so that the shoulder formed is the attachment of the assembly stamp. According to MTZ Motortechnische Zeitschrift (1975), number 12, page 1, valve stem seals are known, the vulcanized stiffening ring of which is bent radially outwards to form a type of assembly collar in the area between the lip part and the adhesive part.
  • valve stem seals with radially inward or outward stiffening rings in the area between the lip part and the adhesive part, there is at the same time the risk that the relatively high specific. Surface pressure the rubber-metal connection is damaged in this area, so that the entire seal can fail.
  • the present invention is therefore an object of the invention to provide a lip seal ring, in particular a valve stem seal for internal combustion engines, the metallic stiffening cylinder of which has a shoulder for the assembly stamp while taking up relatively small radial installation spaces, without the risk of destroying the rubber-metal bond when pressed onto the Valve stem exists.
  • the seal should be simple and inexpensive to manufacture at the same time.
  • This task is solved according to the invention by a lip sealing ring, the cylindrical stiffening part of which, forming a kind of ruff, has a larger diameter in the area facing the sealing lip part than in the area facing the adhesive part.
  • the elastomer is vulcanized onto the inner circumferential surface of the stiffening cylinder, while the outer circumferential surface and the base surface are free of elastomer coatings.
  • the bend is preferably approximately in the central region of the cylinder and extends to a length of up to approximately 1/5 of the total length of the cylinder.
  • the radial height of the bend as the difference between the two cylinder half radii is preferably at most equal to the radial wall thickness of the cylinder plate, so that the individual cylinders cannot be inserted into one another during the production process.
  • the stiffening cylinder in deviation from the circular shape, can have the shape of a polygon, so that a radial spring is formed and a larger tolerance range for the fit of the lip part on the valve guide can be bridged.
  • oval stiffening cylinders have proven to be advantageous, in particular for manufacturing reasons.
  • the deviations of the cross sections from the circular shape may need only relate to the halves of the stiffening cylinder opposite the lip part.
  • the stiffening part By designing the stiffening part with the neck brace instead of a collar, due to the small diameter tolerance, the full use of the radial space is made possible. A good transfer of the assembly forces takes place from the assembly stamp, which rests on the base of the cylinder facing the lip part if it only rests on a small circular area.
  • the invention also enables good guidance of the valve stem sealing ring in the assembly stamp and the use of a sufficiently metered rubber lip and spring when mounting the valve stem sealing rings on the guide, even if the valve was previously inserted into its guide for production reasons.
  • the rubber-metal bond between the lip part and the adhesive part can no longer be easily damaged.
  • the larger binding surface of the lip part to the stiffening part provides better protection against its destruction.
  • the invention which is preferably to be used for valve stem seals with relatively small diameters, can in principle also be applied to lip sealing rings in general with similar dimensions and assembly problems.
  • FIG. 1 shows the valve stem seal, which is pressed onto the seat 5 in the direction of the arrow 4 with the assembly stamp 2 on the valve stem 3.
  • the sealing lip 7 is pressed onto the shaft 3 with the radial spring 8.
  • At the stiffener cylinder 9 is located approximately in the middle of the ruff-like extension 10. From the mounting die 2, from the wall surface of the recess 11, the force is transmitted to the base surface 12 of the stiffening cylinder 9 facing the lip part 7.
  • the stiffening cylinder 9 ' has an oval and in Figure 4 the stiffening cylinder 9 "has an octagonal cross section.
  • the elastomer jacket 6 is circular on the inner circumference in all cases, while in the embodiments of Figures 3 and 4 it is on its outer circumference Adaptation to the shape of the stiffening cylinder 9 'and 9 "oval or octagonal.

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

Abstract

Der voaugsweise metallische Versteifungsrylinder (9) in zum Dichtlippenteil (7) weisenden Bereich besitzt einen grösseren Durchmesser als in zum Haftteil (6) weisenden Bereich. Die Durchmesserdifferenz liegt bevorzugt bei der zweifachen radialen Metallblechstärke des Zylinders. Durch Anvulkanisieren des Elastomers lediglich an die innere Mantelfläche des Versteifungsteils bilet deren zum Lippenteil weisende Grundfläche (12) den Ansatzpunkt des Montagestempels (2) zum Aufpressen des Ringes auf den Ventilschaft (3)The preferably metallic stiffening cylinder (9) in the area facing the sealing lip part (7) has a larger diameter than in the area facing the adhesive part (6). The diameter difference is preferably twice the radial sheet metal thickness of the cylinder. By vulcanizing the elastomer only onto the inner lateral surface of the stiffening part, the base surface (12) facing the lip part forms the starting point of the assembly stamp (2) for pressing the ring onto the valve stem (3).

Der Querschnitt des Versteifungszylinders weist gegebenenfalls auf der dem Lippenteil gegenüberliegenden Hälfte eine von der Kreisform abweichende Kontur, wie insbesondere eine ovale oder achteckige Kontur, auf.

Figure imgaf001
The cross section of the stiffening cylinder may have a contour deviating from the circular shape on the half opposite the lip part, such as in particular an oval or octagonal contour.
Figure imgaf001

Description

Die Erfindung betrifft einen Lippendichtungsring, insbesondere eine Ventilschaftabdichtung für Verbrennungskraftmaschinen, bestehend aus einem elastischen Werkstoff mit einem vorzugsweise federbelasteten Dichtlippenteil, einem zylindrischen Versteifungsring aus Metall oder einem sonstigen Werkstoff und einem vom Versteifungsring gebildeten Ansatzpunkt des Montagestempels.The invention relates to a lip seal ring, in particular a valve stem seal for internal combustion engines, consisting of an elastic material with a preferably spring-loaded sealing lip part, a cylindrical stiffening ring made of metal or another material and a starting point of the assembly stamp formed by the stiffening ring.

Die Befestigung von Ventilschaftringen mit oder ohne federbelasteten Dichtlippen auf den Ventilführungen erfolgt durch Klammern, Federn, Metal und / oder Hartstoffringen oder einvulkanisierten metallis hen Versteifungsringen. Bei der Montage erfolgt das Aufpressen des Dichtteiles auf die Ventilführung mit Hilfe eines zylindrischen Montagestempels. Damit der Montagestempel am Dichtring angreifen kann, besitzt der Versteifungsring als Montagehilfe radial nach außen stehende Vorsprünge.Valve stem rings with or without spring-loaded sealing lips are attached to the valve guides using clamps, springs, metal and / or hard material rings or vulcanized-in metal stiffening rings. During assembly, the sealing part is pressed onto the valve guide using a cylindrical assembly plunger. The stiffening ring has protrusions that protrude radially outwards so that the assembly stamp can engage the sealing ring.

So sind bereits Ventilschaftabdichtungen bekannt, an deren Versteifungsringen Halte- und Montageflansche angebracht sind. Nach der DE - OS 1 550 247 ist es beispielsweise bekannt, den Versteifungsring im Bereich zwischen dem Halteteil und dem Dichtlippenteil radial nach innen abzubiegen, so daß die gebildete Schulter der Ansatz des Montagestempels ist. Nach MTZ Motortechnische Zeitschrift ( 1975 ), Heft 12, Seite 1 sind Ventilschaftabdichtungen bekannt, deren einvulkanisierter Versteifungsring unter Bildung einer Art Montagekragen im Bereich zwischen Lippenteil und Haftteil radial nach außen stehend abgebogen ist. Nachteile der Lösungen mit radial nach außen stehenden Montagehilfen sind jedoch die Beanspruchung relativ großer Bauräume, so daß, wenn zum Beispiel bei Motoren mit zwei Ventilfedern der radiale Bauraum sehr beengt ist, derartige Ventilschaftabdichtungen nicht eingesetzt werden können. Wenn ferner in speziellen Aufgabenstellungen das Ventil bereits in die Führung eingesetzt ist, bevor der Ventilschaftabdichtungsring aufgepreßt wurde, ist die Auslegung des Montagestempels eingegrenzt. Zusätzlich besitzen die Abbiegungen, bedingt durch ihre Herstellung, einen relativ großen Ziehradius und die Versteifungsringe an ihrem Außendurchmesser eine relativ große Schnittoleranz. Zur Toleranzüberbrückung müssen bei derartigen Ringen auch die äußeren Mantelflächen mit Elastomeren überzogen sein. Bei Ventilschaftabdichtungen mit radial nach innen oder außen gebogenen Versteifungsringen im Bereich zwischen Lippenteil und Haftteil besteht zugleich die Gefahr, daß durch die relativ hohe spezifische. Flächenpressung die Gummimetallverbindung in diesem Bereich beschädigt wird, so daß es zum Ausfall der gesamten Abdichtung kommen kann.Valve stem seals are already known, on the stiffening rings of which holding and mounting flanges are attached. According to DE-OS 1 550 247, it is known, for example, to bend the stiffening ring radially inwards in the region between the holding part and the sealing lip part, so that the shoulder formed is the attachment of the assembly stamp. According to MTZ Motortechnische Zeitschrift (1975), number 12, page 1, valve stem seals are known, the vulcanized stiffening ring of which is bent radially outwards to form a type of assembly collar in the area between the lip part and the adhesive part. Disadvantages of the solutions with radially outward mounting aids, however, are the use of relatively large installation spaces, so that, for example, valve shafts seals of this type cannot be used if the radial installation space is very narrow in engines with two valve springs. Furthermore, if the valve is already inserted in the guide in special tasks before the valve stem sealing ring has been pressed on, the design of the assembly stamp is limited. In addition, due to their manufacture, the bends have a relatively large drawing radius and the stiffening rings on their outer diameter have a relatively large cutting tolerance. In order to bridge the tolerance, the outer lateral surfaces of such rings must also be covered with elastomers. In valve stem seals with radially inward or outward stiffening rings in the area between the lip part and the adhesive part, there is at the same time the risk that the relatively high specific. Surface pressure the rubber-metal connection is damaged in this area, so that the entire seal can fail.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, einen Lippendichtungsring, und zwar insbesondere eine Ventilschaftabdichtung für Brennkraftmaschinen zu schaffen, deren metallischer Versteifungszylinder unter Beanspruchung relativ geringer radialer Bauräume einen Ansatz für den Montagestempel besitzt, ohne daß die Gefahr der Zerstörung der Gummimetallbindung beim Aufpressen auf den Ventilschaft besteht. Die Dichtung soll zugleich einfach und kostensparend herstellbar sein. Diese Aufgabenstellung wird erfindungsgemäß durch einen Lippendichtungsring gelöst, dessen zylindrischer Versteifungsteil unter Bildung einer Art Halskrause im zum Dichtlippenteil weisenden Bereich einen größeren Durchmesser als im zum Haftteil weisenden Bereich besitzt. An die innere Mantelfläche des Versteifungszylinders ist das Elastomer anvulkanisiert, während die äußere Mantelfläche und die Grundfläche frei von Elastomerauflagen sind. Die Biegung liegt bevorzugt etwa im mittleren Bereich des Zylinders und erstreckt sich auf eine Länge von bis zu etwa 1/5 der Gesamtlänge des Zylinders. Die radiale Höhe der Aufbiegung als Differenzbetrag der beiden Zylinderhälftenradien ist bevorzugt maximal gleich der radialen Wandstärke des Zylinderbleches, so daß während der Herstellungsverfahren die einzelnen Zylinder sich nicht ineinanderstecken können. Gegebenenfalls kann der Versteifungszylinder in Abweichung von der Kreisform die Form eines Polygons besitzen, so daß eine Radialfeder gebildet wird und ein größerer Toleranzbereich für den Sitz des Lippenteiles auf der Ventilführung überbrückt werden kann. In anderen Fällen haben sich,insbesondere aus fertigungstechnischen Gründen,ovale Versteifungszylinder als vorteilhaft erwiesen. Die Abweichungen der Querschnitte von der Kreisform brauchen sich gegebenenfalls nur auf die dem Lippenteil entgegengesetzten Hälften des Versteifungszylinders beziehen.The present invention is therefore an object of the invention to provide a lip seal ring, in particular a valve stem seal for internal combustion engines, the metallic stiffening cylinder of which has a shoulder for the assembly stamp while taking up relatively small radial installation spaces, without the risk of destroying the rubber-metal bond when pressed onto the Valve stem exists. The seal should be simple and inexpensive to manufacture at the same time. This task is solved according to the invention by a lip sealing ring, the cylindrical stiffening part of which, forming a kind of ruff, has a larger diameter in the area facing the sealing lip part than in the area facing the adhesive part. The elastomer is vulcanized onto the inner circumferential surface of the stiffening cylinder, while the outer circumferential surface and the base surface are free of elastomer coatings. The bend is preferably approximately in the central region of the cylinder and extends to a length of up to approximately 1/5 of the total length of the cylinder. The radial height of the bend as the difference between the two cylinder half radii is preferably at most equal to the radial wall thickness of the cylinder plate, so that the individual cylinders cannot be inserted into one another during the production process. If necessary, the stiffening cylinder, in deviation from the circular shape, can have the shape of a polygon, so that a radial spring is formed and a larger tolerance range for the fit of the lip part on the valve guide can be bridged. In other cases, oval stiffening cylinders have proven to be advantageous, in particular for manufacturing reasons. The deviations of the cross sections from the circular shape may need only relate to the halves of the stiffening cylinder opposite the lip part.

Durch Ausbildung des Versteifungsteiles mit der Halskrause statt eines Bundes wird, bedingt durch die geringe Durchmessertoleranz, die volle Ausnutzung des radialen Bauraumes ermöglicht. Vom Montagestempel, der auf der zum Lippenteil weisenden Grundfläche des Zylinders aufliegt, erfolgt eine gute übertragung der Montagekräfte, selbst wenn er lediglich auf einer kleinen Kreisringfläche aufliegt. Die Erfindung ermöglicht auch eine gute Führung des Ventilschaftdichtringes im Montagestempel und die Verwendung einer ausreichend dosierten Gummilippe und Feder bei Montage der Ventilschaftdichtringe auf die Führung, selbst wenn aus produktionstechnischen Gründen das Ventil schon vorher in seine Führung eingeschoben wurde. Die Gummimetallbindung zwischen Lippenteil und Haftteil kann nicht mehr so leicht beschädigt werden. Durch die größere Bindefläche des Lippenteils zum Versteifungsteil entsteht ein besserer Schutz vor dessen Zerstörung.By designing the stiffening part with the neck brace instead of a collar, due to the small diameter tolerance, the full use of the radial space is made possible. A good transfer of the assembly forces takes place from the assembly stamp, which rests on the base of the cylinder facing the lip part if it only rests on a small circular area. The invention also enables good guidance of the valve stem sealing ring in the assembly stamp and the use of a sufficiently metered rubber lip and spring when mounting the valve stem sealing rings on the guide, even if the valve was previously inserted into its guide for production reasons. The rubber-metal bond between the lip part and the adhesive part can no longer be easily damaged. The larger binding surface of the lip part to the stiffening part provides better protection against its destruction.

Die Erfindung, die bevorzugt bei Ventilschaftabdichtungen mit relativ kleinen Durchmessern angewendet werden soll, kann im Prinzip auch bei Lippendichtungsringen allgemein mit ähnlichen Abmessungen und Montageproblemen angewendet werden.The invention, which is preferably to be used for valve stem seals with relatively small diameters, can in principle also be applied to lip sealing rings in general with similar dimensions and assembly problems.

Anhand der Abbildungen 1 bis 4 wird die Erfindung näher erläutert, und zwar zeigt

  • Figur 1 das Schnittbild der erfindungsgemäßen Ventilschaftabdichtung und die Figuren 2 bis 4 zeigen Querschnittsbilder der auf den Ventilschaft montierten Ventilschaftabdichtungen mit Versteifungszylindern unterschiedlicher Querschnittsformen in der Schnittlinie II - IV der Figur 1.
The invention will be explained in more detail with reference to FIGS. 1 to 4, namely
  • 1 shows the sectional view of the valve stem seal according to the invention and FIGS. 2 to 4 show cross-sectional images of the valve stem seals mounted on the valve stem with stiffening cylinders of different cross-sectional shapes in the section line II-IV of FIG. 1.

In Figur 1 zeigt 1 die Ventilschaftabdichtung, die mit dem Montagestempel 2 auf den Ventilschaft 3 in Pfeilrichtung 4 auf den Sitz 5 gepreßt wird. Die Dichtlippe 7 wird mit der Radialfeder 8 auf den Schaft 3 gepreßt. Am Versteifungszylinder 9 liegt etwa in der Mitte die halskrausenartige Erweiterung 10. Vom Montagestempel 2 erfolgt von dessen Wandfläche der Ausnehmung 11 die Kraftübertragung auf die zum Lippenteil 7 weisende Grundfläche 12 des Versteifungszylinders 9.In FIG. 1, 1 shows the valve stem seal, which is pressed onto the seat 5 in the direction of the arrow 4 with the assembly stamp 2 on the valve stem 3. The sealing lip 7 is pressed onto the shaft 3 with the radial spring 8. At the stiffener cylinder 9 is located approximately in the middle of the ruff-like extension 10. From the mounting die 2, from the wall surface of the recess 11, the force is transmitted to the base surface 12 of the stiffening cylinder 9 facing the lip part 7.

In der Abbildung 2 ist der Querschnitt des Versteifungszylinders 9 kreisförmig.In Figure 2, the cross section of the stiffening cylinder 9 is circular.

In der Abbildung 3 besitzt der Versteifungszylinder 9'einen ovalen und in der Abbildung 4 besitzt der Versteifungszylinder 9" einen achteckigen Querschnitt. Der Elastomermantel 6 ist in allen Fällen am Innenumfang kreisrund, während er in den Ausführungen der Abbildungen 3 und 4 an seinem Außenumfang zur Anpassung an die Form der Versteifungszylinder 9' und 9" oval beziehungsweise achteckig ist.In Figure 3 the stiffening cylinder 9 'has an oval and in Figure 4 the stiffening cylinder 9 "has an octagonal cross section. The elastomer jacket 6 is circular on the inner circumference in all cases, while in the embodiments of Figures 3 and 4 it is on its outer circumference Adaptation to the shape of the stiffening cylinder 9 'and 9 "oval or octagonal.

Claims (7)

1. Lippendichtungsring, insbesondere eine Ventilschaftabdichtung; bestehend aus einem elastischen Werkstoff, einem zylindrischen Versteifungsteil aus einem Metall oder einem sonstigen Werkstoff und einem vom Versteifungsteil gebildeten Ansatzpunkt zur Kraftübertragung durch den Montagestempel, dadurch gekennzeichnet, daß der Versteifungsteil ( 9 ) unter Bildung einer Art Halskrause ( 10 ) im zum Dichtlippenteil ( 7 ) weisenden Bereich einen größeren Durchmesser als im zum Haftteil ( 6 ) weisenden Bereich besitzt, und daß das Elastomer im zum Dichtlippenteil ( 7 ) weisenden Bereich ausschließlich an der Innenfläche des Versteifungszylinders ( 9 ) anvulkanisiert ist, so daß die innere Grundfläche ( 12 ) des Versteifungszylinders ( 9 ) den Ansatzpunkt des Montagestempels ( 2 ) bildet.1. lip seal ring, in particular a valve stem seal; Consisting of an elastic material, a cylindrical stiffening part made of a metal or another material and a starting point formed by the stiffening part for power transmission through the assembly stamp, characterized in that the stiffening part (9) forming a type of frill (10) in the sealing lip part (7 ) facing area has a larger diameter than in the area facing the adhesive part (6), and that the elastomer in the area facing the sealing lip part (7) is vulcanized exclusively on the inner surface of the stiffening cylinder (9), so that the inner base surface (12) of the Stiffening cylinder (9) forms the starting point of the assembly stamp (2). 2. Lippendichtungsring nach Anspruch 2, dadurch gekennzeichnet, daß die Aufbiegung ( 10 ) im etwa mittleren Bereich des Versteifungszylinders ( 9 ) liegt und ihre Länge bis zu maximal 1/5 der Gesamtlänge des Versteifungszylinders ( 9 ) beträgt.2. Lip sealing ring according to claim 2, characterized in that the bend (10) is in the approximately central region of the stiffening cylinder (9) and its length is up to a maximum of 1/5 of the total length of the stiffening cylinder (9). 3. Lippendichtungsring nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die radiale Höhe der Aufbiegung ( 10 ) maximal etwa gleich der radialen Wandstärke des Versteifungszylinders ( 9 ) ist.3. lip sealing ring according to claims 1 and 2, characterized in that the radial height of the bend (10) is at most approximately equal to the radial wall thickness of the stiffening cylinder (9). 4. Lippendichtungsring nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der Versteifungsring ( 9', 9'' ) einen von der Kreisform abweichenden Querschnitt aufweist.4. lip sealing ring according to claims 1 to 3, characterized in that the stiffening ring (9 ', 9' ') has a cross-section deviating from the circular shape. 5. Lippendichtungsring nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Versteifungsring ( 9") einen polygonalen Querschnitt besitzt.5. lip sealing ring according to claims 1 to 4, characterized in that the stiffening ring (9 ") has a polygonal cross section. 6. Lippendichtungsring nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Versteifungsring ( 9' ) einen ovalen Querschnitt besitzt.6. lip sealing ring according to claims 1 to 4, characterized in that the stiffening ring (9 ') has an oval cross-section. 7. Lippendichtungsring nach den Ansprüchen 1 bis 6, dadurch gekennzeichnet, daß der Querschnitt des Versteifungsringes (9', 9") ausschließlich in der dem Dichtlippenteil ( 7 ) gegenüberliegenden Hälfte von der Kreisform abweicht.7. lip seal ring according to claims 1 to 6, characterized in that the cross section of the stiffening ring (9 ', 9 ") deviates from the circular shape only in the half opposite the sealing lip part (7).
EP82107353A 1981-09-18 1982-08-13 Sealing ring with a sealing lip, especially for valve stems Expired EP0075702B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3137135 1981-09-18
DE3137135 1981-09-18
DE3222356A DE3222356C2 (en) 1981-09-18 1982-06-14 Valve stem seal for internal combustion engines
DE3222356 1982-06-14

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EP0075702A1 true EP0075702A1 (en) 1983-04-06
EP0075702B1 EP0075702B1 (en) 1984-11-28

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US (1) US4531483A (en)
EP (1) EP0075702B1 (en)
BR (1) BR8205179A (en)
DE (2) DE3222356C2 (en)
MX (1) MX154587A (en)

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DE3412817C1 (en) * 1984-04-05 1985-04-18 Goetze Ag, 5093 Burscheid Rod seal
US4826180A (en) * 1987-04-04 1989-05-02 Goetze Ag Valve stem sealing assembly

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US4811704A (en) * 1988-03-07 1989-03-14 Vernay Laboratories, Inc. Valve stem seal
DE3836578A1 (en) * 1988-10-27 1990-05-03 Goetze Ag Valve stem sealing for internal combustion engines
US4947811A (en) * 1989-06-30 1990-08-14 Dana Corporation Floating valve stem seal
US4928644A (en) * 1989-07-30 1990-05-29 Travis Gilbert E Lubrication control
US4993379A (en) * 1989-11-02 1991-02-19 Rft S.P.A. Sliding stem seal, particularly for valve stems
US5174256A (en) * 1991-11-25 1992-12-29 Dana Corporation Variable guide height valve seal
DE4318051B4 (en) * 1993-05-29 2009-06-10 Skf Sealing Solutions Gmbh Lip seal ring, in particular valve stem seal
DE19709170C2 (en) * 1997-03-06 1999-11-04 Cr Elastomere Gmbh Sealing for reciprocating machine parts, especially valve stem seals
US5873337A (en) * 1997-08-04 1999-02-23 Dana Corporation In-guide valve stem seal
US6202616B1 (en) * 1999-02-17 2001-03-20 Briggs & Stratton Corporation Valve seal assembly for an internal combustion engine
US6679502B1 (en) 2001-08-28 2004-01-20 Dana Corporation Valve stem seal assembly with valve guide retainer
DE10207818B4 (en) * 2002-02-25 2006-04-06 Carl Freudenberg Kg Valve stem seal on internal combustion engines
US6764079B1 (en) * 2002-04-19 2004-07-20 Dana Corporation Valve seal assembly with straight-walled retainer
EP1749980B1 (en) * 2005-08-01 2011-03-09 CORCOS INDUSTRIALE S.a.s. di Externa Italia S.r.l. Gasket for a valve of an internal combustion engine
JP2008205170A (en) * 2007-02-20 2008-09-04 Nec Lighting Ltd Light-emitting semiconductor device
US8235394B2 (en) * 2007-12-06 2012-08-07 Freudenberg-Nok General Partnership Valve stem seal with gas relief features
US8011669B2 (en) * 2007-12-06 2011-09-06 Freudenberg-Nok General Partnership Valve stem seal with gas relief features
US9371749B2 (en) 2012-02-08 2016-06-21 Dana Automotive Systems Group, Llc Hybrid valve stem seal retainer assembly

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US4826180A (en) * 1987-04-04 1989-05-02 Goetze Ag Valve stem sealing assembly

Also Published As

Publication number Publication date
EP0075702B1 (en) 1984-11-28
MX154587A (en) 1987-10-15
BR8205179A (en) 1983-08-16
DE3222356C2 (en) 1984-09-13
US4531483A (en) 1985-07-30
DE3222356A1 (en) 1983-04-14
DE3261378D1 (en) 1985-01-10

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