EP0877150B1 - Two-part valve stem seal - Google Patents

Two-part valve stem seal Download PDF

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Publication number
EP0877150B1
EP0877150B1 EP97114653A EP97114653A EP0877150B1 EP 0877150 B1 EP0877150 B1 EP 0877150B1 EP 97114653 A EP97114653 A EP 97114653A EP 97114653 A EP97114653 A EP 97114653A EP 0877150 B1 EP0877150 B1 EP 0877150B1
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EP
European Patent Office
Prior art keywords
sleeve part
valve
cylindrical sleeve
rigid
stem seal
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Expired - Lifetime
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EP97114653A
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German (de)
French (fr)
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EP0877150A1 (en
Inventor
Karry Kirschner
Milton L. Griswold
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Carl Freudenberg KG
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Carl Freudenberg KG
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Publication of EP0877150A1 publication Critical patent/EP0877150A1/en
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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 is concerned with valve stem seals, particularly with a two-part valve stem seal for Use in an internal combustion engine.
  • valve stem seals From US-A-5, 174, 256, US-A-4,947,811, US-A-4,909,202, US-A-3,554,562, US-A-5,558,056 and US-A-3,554,180 are valve stem seals known.
  • a valve stem seal has the function (1) Metering of oil for adequate lubrication on the valve stem / Valve guide interface, and (2) minimization of internal oil consumption.
  • a valve stem seal assembly includes a rigid sleeve part to attach a sealing body to fix a valve stem guide, the inner diameter of the sleeve part with the outer diameter of the guide cooperates.
  • the sleeve part usually registers Sealing element, which is centered around the valve stem, to measure oil, which is the interface between the inner diameter the guide and the valve stem lubricates, but with the in a combustion chamber or an exhaust chamber the amount of oil sucked in should be as small as possible.
  • the sealing element can not in suitably sit on the valve stem, resulting in uneven pressures on the cylinder and the valve guide, undesirable signs of wear on the seal or the valve stem and an oil flow that cannot be determined in advance to the valve stem.
  • Previous valve stem seals have shown cracks on the Flanges during vehicle operation, as in concentrated Shock waves and internal loads on the flange section the valve stem seal occurred. Previous valve stem seals also caused difficulties with the Provision of a flat flange, as this makes the Risk of crack formation on the flange is increased.
  • the invention aims to provide a two-part valve stem seal to provide with improved properties.
  • valve stem seal are provided which have better resilience against forces exerted by the valve spring be, and the previous cracks on the flange led.
  • a heat-treated metal flange are provided, which prevents the sealing element the arrangement separate from the valve guide can.
  • one provided with a flange Valve stem seals are provided, which are not about the valve guide due to the rotational movement of the Valve spring turns. This allows torsional stresses on the spring lip eliminating the Wear is reduced and the service life can be increased.
  • this is a valve stem seal assembly provided, which specified in claim 1 is.
  • a two-part valve stem seal specified which is a rigid, cylindrical sleeve part includes.
  • the valve stem seal also includes a resilient compliant rubber sealing body, which adheres directly is connected to the metal housing.
  • the sealing element also has a tight fit in cooperation with the heat-treated metal flange. The sealing element after the invention remains stationary, whereby the wear on the sealing lip can be reduced and the service life can be increased.
  • Another advantage of the invention is that that the difficulties with regard to cracking on the flange in the valve stem seal according to the invention let reduce.
  • the valve stem seal assembly 10 has a two-part design.
  • the two-part design comprises a rigid sleeve part 14, which is preferably made of a metallic material is made, but also from a ceramic Material or any other hard, rigid material can be made.
  • the rigid sleeve part 14 is also preferably cylindrical. However, it can any other suitable shape depending on the respective circumstances with the special application forms the valve stem seal assembly.
  • the valve stem seal assembly 10 also includes a resilient Sealing body 18, which adheres directly to the rigid, cylindrical sleeve part 14 is connected.
  • the rigid, cylindrical sleeve part 14 is in contact with one second, rigid sleeve part 15.
  • the second, rigid sleeve part is in contact with one second, rigid sleeve part.
  • the second rigid sleeve part 16 is preferably made of a metallic material manufactured, but can also be made of a ceramic material or some other rigid material.
  • the second rigid sleeve part 16 is also preferred cylindrical. But it can also be any other suitable shape depending on the particular Conditions for the special application forms of the valve stem seal arrangement to have.
  • the resilient sealing body 18 preferably is made of a rubber material. He can also be resilient from any other Made of rubber material or a plastic material which can provide sealing properties.
  • at the preferred embodiment of the rigid, cylindrical Sleeve part 14 is a tight fit with the second, rigid Sleeve part 16 provided, but there may also be any other types of connections or adhesive bonds, such as Welding, direct forging, or other types of connection or connecting devices can be used.
  • the rigid cylindrical sleeve part 14 includes an inwardly facing End wall 20.
  • the rigid, cylindrical sleeve part 14 also includes an outwardly projecting flange 22 one end of the same.
  • the rigid, cylindrical sleeve part 14 also includes an outwardly directed gradation 44 an inner surface of the sleeve part 14.
  • the resilient sealing body 18 is directly on the End wall 20 of the rigid, cylindrical sleeve part 14 is formed.
  • the resilient sealing body 18 can on the end wall 20 may be formed in such a way that it forms the end wall 20 completely surrounds.
  • other types of formation can also be used to connect the sealing body 18 with the rigid, cylindrical sleeve part 14 are used. It should be mentioned that other methods, such as a Fixed fit, epoxy resins or other methods can be used which can allow you to have a firm connection between the cylindrical sleeve part 14 and the resilient compliant seal body 18 receives.
  • the rubber lining 28 is also on the inner wall of the rigid, cylindrical sleeve part 14 is formed and is in contact with the valve guide 24 when inserted into an engine cylinder head or an engine block 26.
  • the rigid, cylindrical Sleeve part 14 has a tight fit with the second, cylindrical Sleeve part 16 and generates a holding force to the Rubber liner 28 in constant contact with the valve guide assembly 24 press.
  • the vertical wall 30 of the second, rigid, cylindrical sleeve part 16 prevented any possibility that the sealing element of the valve stem assembly yourself from the valve guide 24 during the Operation of the vehicle can solve.
  • the second, rigid sleeve part 16 also offers protection in that the Valve spring 32 before wear in the cylinder head 26 is protected during the operating state.
  • the second, cylindrical sleeve part 16 comprises one after internal flange 34.
  • the second, cylindrical Sleeve member 16 also includes a metal flange or one Seat 36, which is in direct contact with the engine block head Is 26 and forms the seat for the valve spring 32, so that the valve spring 32 in the cylinder head during vehicle operation is not exposed to wear.
  • the second, rigid, cylindrical sleeve part 16 is separate from the first, rigid, cylindrical sleeve portion 14 of the valve stem seal assembly 10 manufactured. This separate manufacturing method allows the occurrence of internal Loads on the second, rigid, cylindrical sleeve part 16 can be reduced.
  • the Flange 26 of the second, rigid, cylindrical sleeve part has a flatness that can be specified more precisely, which increases the frequency of crack formation can reduce the flange, this cracking in general a problem with valve stem seals of this type represents.
  • the second, rigid, cylindrical sleeve part 16 separate from the first, rigid, cylindrical sleeve part 14 and the sealing body 18th is manufactured, can be made according to the manufacturing processes for the separate parts this to a valve stem seal arrangement 10 put together, which in a vehicle internal combustion engine is used.
  • the resilient sealing body 18 also includes one annular sealing lip 38 on the upper part, which is a constant Seal with the valve stem 14 during the vehicle operating condition provides.
  • the resilient Seal body 18 also includes a concave recess 42 along the upper part of the resilient sealing body 18.
  • the concave recess 42 takes a spring part 12 and holds it in its position, which is the springy compliant, annular sealing lip 38 in constant contact presses against the valve stem 40 during vehicle operation. This spring 12 and the annular sealing lip 38 control the amount of oil between the valve stem 40 and the Valve stem seal assembly 10.
  • valve stem seal arrangements were in the operating state forced while working a motor vehicle and their internal combustion engine by the valve spring to turn. As a result, the sealing lip is subjected to torsional stresses exposed as well as axial forces to and fro moving valve stem while working the Internal combustion engine.
  • the first, cylindrical, rigid sleeve part 14 of the second, rigid, cylindrical Sleeve part 16 separated, allowing the second, rigid, cylindrical sleeve part 16 with the Valve spring 12 can rotate, but the entire valve stem seal assembly 10 not with the valve spring 12 rotates. This results in the sealing element 18 with respect of the valve stem 40 is stationary, i.e. that it is does not rotate around the valve stem 40.
  • valve stem seal assembly 10 is installed as a unit, there is a tight fit between the first, rigid, cylindrical Sleeve part 14 and the second, rigid, cylindrical sleeve part 16 is provided.
  • the separation of the first, rigid, cylindrical sleeve part 14 of the second, rigid, cylindrical Sleeve part 16 occurs only during engine operation on, which only enables the second, rigid, cylindrical sleeve part 16 a rotational movement executes while the first, rigid, cylindrical sleeve part 14 and the sealing body 18 stationary around the valve stem 40 stay.

Abstract

A two piece valve stem seal assembly including a first rigid cylindrical shell having a flange portion and an end wall at a top portion. The valve stem seal assembly also includes a second rigid cylindrical shell having an outwardly radially extending seat portion and an inner radially extending flange. The valve stem seal assembly also including a resilient sealing body directly bonded with said first rigid cylindrical shell.

Description

Die Erfindung befaßt sich mit Ventilschaftdichtungen, insbesondere mit einer zweiteiligen Ventilschaftdichtung zum Einsatz bei einer Brennkraftmaschine.The invention is concerned with valve stem seals, particularly with a two-part valve stem seal for Use in an internal combustion engine.

Aus US-A-5, 174, 256, US-A-4,947,811, US-A-4,909,202, US-A-3,554,562, US-A-5,558,056 und US-A-3,554,180 sind Ventilschaftdichtungen bekannt. Eine Ventilschaftdichtung hat die Funktion (1) das Zumessen von Öl für eine adäquate Schmierung am Ventilschaft/der Ventilführungsgrenzfläche, und (2) die Minimierung des internen Ölverbrauchs.From US-A-5, 174, 256, US-A-4,947,811, US-A-4,909,202, US-A-3,554,562, US-A-5,558,056 and US-A-3,554,180 are valve stem seals known. A valve stem seal has the function (1) Metering of oil for adequate lubrication on the valve stem / Valve guide interface, and (2) minimization of internal oil consumption.

Allgemein gesprochen umfaßt eine Ventilschaftdichtunganordnung ein starres Hülsenteil, um einen Dichtungskörper an einer Ventilschaftführung festzulegen, wobei der Innendurchmesser des Hülsenteils mit dem Außendurchmesser der Führung zusammenarbeitet. Das Hülsenteil trägt üblicherweise ein Dichtungselement, welches um den Ventilschaft zentriert ist, um Öl zuzumessen, welches die Grenzfläche zwischen dem Innendurchmesser der Führung und dem Ventilschaft schmiert, wobei aber die in eine Brennkammer oder eine Auslaßkammer eingesaugte Ölmenge möglichst gering sein sollte. Wenn das starre Hülsenteil nicht in geeigneter Weise der Ventilführung zugeordnet ist, kann das Dichtungselement nicht in geeigneter Weise auf dem Ventilschaft aufsitzen, woraus sich ungleichmäßige Drücke am Zylinder und der Ventilführung, unerwünschte Verschleißerscheinungen an der Dichtung oder dem Ventilschaft und ein nicht im voraus bestimmbarer Ölstrom zu dem Ventilschaft ergeben.Generally speaking, a valve stem seal assembly includes a rigid sleeve part to attach a sealing body to fix a valve stem guide, the inner diameter of the sleeve part with the outer diameter of the guide cooperates. The sleeve part usually registers Sealing element, which is centered around the valve stem, to measure oil, which is the interface between the inner diameter the guide and the valve stem lubricates, but with the in a combustion chamber or an exhaust chamber the amount of oil sucked in should be as small as possible. If that rigid sleeve part is not suitable for the valve guide is assigned, the sealing element can not in suitably sit on the valve stem, resulting in uneven pressures on the cylinder and the valve guide, undesirable signs of wear on the seal or the valve stem and an oil flow that cannot be determined in advance to the valve stem.

Bisherige Ventilschaftdichtungen zeigten Rißbildungen an den Flanschen während des Fahrzeugbetriebs, da in konzentrierter Weise Stoßwellen und interne Belastungen am Flanschabschnitt der Ventilschaftdichtung auftraten. Bisherige Ventilschaftdichtungen bereiteten auch Schwierigkeiten hinsichtlich der Bereitstellung eines ebenen Flansches, da hierdurch die Gefahr der Rißbildung am Flansch erhöht wird.Previous valve stem seals have shown cracks on the Flanges during vehicle operation, as in concentrated Shock waves and internal loads on the flange section the valve stem seal occurred. Previous valve stem seals also caused difficulties with the Provision of a flat flange, as this makes the Risk of crack formation on the flange is increased.

Es besteht daher ein Bedürfnis nach einer Ventilschaftdichtung, welche die vorstehend angegebenen Schwierigkeiten und Nachteile beim Stand der Technik überwindet.There is therefore a need for a valve stem seal which the difficulties stated above and Overcomes disadvantages in the prior art.

Die Erfindung zielt darauf ab, eine zweiteilige Ventilschaftdichtung mit verbesserten Eigenschaften bereitzustellen.The invention aims to provide a two-part valve stem seal to provide with improved properties.

Ferner soll nach der Erfindung eine Ventilschaftdichtung bereitgestellt werden, welche eine bessere Widerstandsfähigkeit gegenüber Kräften hat, welche von der Ventilfeder ausgeübt werden, und die bisher zu Rißbildungen am Flansch führten.Furthermore, according to the invention, a valve stem seal are provided which have better resilience against forces exerted by the valve spring be, and the previous cracks on the flange led.

Ferner soll nach der Erfindung ein wärmebehandelter Metallflansch vorgesehen werden, welcher verhindert, daß das Dichtungselement der Anordnung sich von der Ventilführung trennen kann.Furthermore, according to the invention, a heat-treated metal flange are provided, which prevents the sealing element the arrangement separate from the valve guide can.

Ferner soll nach der Erfindung eine mit einem Flansch versehene Ventilschaftdichtung bereitgestellt werden, welche sich nicht um die Ventilführung infolge der Drehbewegung der Ventilfeder dreht. Hierdurch lassen sich Torsionsbeanspruchungen an der Federlippe eliminieren, wodurch sich der Verschleiß reduziert und sich die Standzeit steigern läßt.Furthermore, according to the invention, one provided with a flange Valve stem seals are provided, which are not about the valve guide due to the rotational movement of the Valve spring turns. This allows torsional stresses on the spring lip eliminating the Wear is reduced and the service life can be increased.

Nach der Erfindung wird hierzu eine Ventilschaftdichtungsanordnung bereitgestellt, welche im Patentanspruch 1 angegeben ist.According to the invention, this is a valve stem seal assembly provided, which specified in claim 1 is.

Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen wiedergegeben.Further advantageous embodiments are in the subclaims played.

Nach der Erfindung wird eine zweiteilige Ventilschaftdichtung angegeben, welche ein starres, zylindrisches Hülsenteil umfaßt. Die Ventilschaftdichtung umfaßt ferner einen federnd nachgiebigen Kautschukdichtungskörper, welcher direkt haftend mit dem Metallgehäuse verbunden ist. Das Dichtungselement hat auch einen Festsitz im Zusammenwirken mit dem wärmebehandelten Metallflansch. Das Dichtungselement nach der Erfindung bleibt stationär, wodurch sich der Verschleiß an der Dichtungslippe reduzieren läßt und sich die Standzeit erhöhen läßt.According to the invention, a two-part valve stem seal specified which is a rigid, cylindrical sleeve part includes. The valve stem seal also includes a resilient compliant rubber sealing body, which adheres directly is connected to the metal housing. The sealing element also has a tight fit in cooperation with the heat-treated metal flange. The sealing element after the invention remains stationary, whereby the wear on the sealing lip can be reduced and the service life can be increased.

Gemäß einer vorteilhaften Ausgestaltung nach der Erfindung wird eine haftend verbundene, federnd nachgiebige Dichtung eingesetzt, welche einen vereinfachten Dichtungsein- und - ausbau gestattet, eine stärkere Abstützung der Lippe bereitstellt, und man eine günstigere Zumessung für das Schmiermittel am Ventilschaft erhält.According to an advantageous embodiment according to the invention becomes an adherent, resilient seal used, which simplifies sealing and expansion allowed, provides stronger lip support, and you get a cheaper metering for the lubricant on the valve stem.

Ein weiterer Vorteil nach der erfindungsgemäßen Auslegung ist darin zu sehen, daß kein Abrieb an der Ventilführung während des Dichtungseinbaues auftritt und daß ein Ölaustritt durch das Innere der Dichtung vermieden wird.Another advantage according to the design according to the invention can be seen in the fact that there is no abrasion on the valve guide occurs during the installation of the seal and that oil leaks is avoided by the inside of the seal.

Ein weiterer Vorteil nach der Erfindung ist darin zu sehen, daß sich die Schwierigkeiten im Hinblick auf die Rißbildung am Flansch bei der Ventilschaftdichtung nach der Erfindung reduzieren lassen.Another advantage of the invention is that that the difficulties with regard to cracking on the flange in the valve stem seal according to the invention let reduce.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Beschreibung von bevorzugten Ausführungsformen unter Bezugnahme auf die beigefügte Zeichnung. Darin zeigt:

Fig. 1
eine Seitenansicht einer Ventilschaftdichtung nach der Erfindung;
Fig. 2
eine Schnittansicht der Ventilschaftdichtung längs der Linie 3-3;
Fig. 3
eine Schnittansicht der Ventilschaftdichtung: und
Fig. 4
eine weitere Schnittansicht der Ventilschaftdichtung im Betriebszustand.
Further details, features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the accompanying drawings. It shows:
Fig. 1
a side view of a valve stem seal according to the invention;
Fig. 2
a sectional view of the valve stem seal along the line 3-3;
Fig. 3
a sectional view of the valve stem seal: and
Fig. 4
another sectional view of the valve stem seal in the operating state.

Unter Bezugnahme auf die Zeichnung wird eine zweiteilige Ventilschaftdichtungsanordnung 10 gezeigt. Die Ventilschaftdichtungsanordnung 10 hat eine zweiteilige Auslegungsform. Die zweiteilige Auslegungsform umfaßt ein starres Hülsenteil 14, welches vorzugsweise aus einem metallischen Material hergestellt ist, welches aber auch aus einem keramischen Werkstoff oder irgendeinem anderen harten, steifen Material hergestellt sein kann. Das starre Hülsenteil 14 ist ebenfalls vorzugsweise zylindrisch ausgestaltet. Es kann jedoch auch irgendeine andere geeignete Gestalt in Abhängigkeit von den jeweiligen Gegebenheiten bei den speziellen Anwendungsformen der Ventilschaftdichtungsanordnung haben. Die Ventilschaftdichtungsanordnung 10 umfaßt auch einen federnd nachgiebigen Dichtungskörper 18, welcher direkt haftend mit dem starren, zylindrischen Hülsenteil 14 verbunden ist. Das starre, zylindrische Hülsenteil 14 ist in Kontakt mit einem zweiten, starren Hülsenteil 15. Das zweite, starre Hülsen-. teil 16 ist vorzugsweise aus einem metallischen Material hergestellt, kann aber auch aus einem keramischen Werkstoff oder irgendeinem anderen starren Material hergestellt sein. Das zweite, starre Hülsenteil 16 ist ebenfalls vorzugsweise zylindrisch ausgestaltet. Es kann aber auch irgendeine andere geeignete Gestalt in Abhängigkeit von den jeweiligen Gegebenheiten bei den speziellen Anwendungsformen der Ventilschaftdichtungsanordnung haben. Es sollte noch erwähnt werden, daß der federnd nachgiebige Dichtungskörper 18 vorzugsweise aus einem Kautschukmaterial hergestellt ist. Er kann aber auch aus irgendeinem anderen federnd nachgiebigen Kautschukmaterial oder einem Kunststoffmaterial hergestellt sein, welches Dichtungseigenschaften bereitstellen kann. Bei der bevorzugten Ausführungsform des starren, zylindrischen Hülsenteils 14 ist ein Festsitz mit dem zweiten, starren Hülsenteil 16 vorgesehen, aber es können auch irgendwelche andere Arten von Verbindungen oder Haftverbindungen, wie Schweißen, direktes Schmieden, oder andere Verbindungsarten oder Verbindungseinrichtungen, eingesetzt werden. Das starre, zylindrische Hülsenteil 14 umfaßt eine nach innen weisende Stirnwand 20. Das starre, zylindrische Hülsenteil 14 umfaßt auch einen nach außen vorstehenden Flansch 22 an einem Ende desselben. Das starre, zylindrische Hülsenteil 14 umfaßt ferner eine nach außen gerichtete Abstufung 44 auf einer inneren Fläche des Hülsenteils 14.With reference to the drawing, a two-part Valve stem seal assembly 10 shown. The valve stem seal assembly 10 has a two-part design. The two-part design comprises a rigid sleeve part 14, which is preferably made of a metallic material is made, but also from a ceramic Material or any other hard, rigid material can be made. The rigid sleeve part 14 is also preferably cylindrical. However, it can any other suitable shape depending on the respective circumstances with the special application forms the valve stem seal assembly. The valve stem seal assembly 10 also includes a resilient Sealing body 18, which adheres directly to the rigid, cylindrical sleeve part 14 is connected. The rigid, cylindrical sleeve part 14 is in contact with one second, rigid sleeve part 15. The second, rigid sleeve part. part 16 is preferably made of a metallic material manufactured, but can also be made of a ceramic material or some other rigid material. The second rigid sleeve part 16 is also preferred cylindrical. But it can also be any other suitable shape depending on the particular Conditions for the special application forms of the valve stem seal arrangement to have. It should still be mentioned be that the resilient sealing body 18 preferably is made of a rubber material. He can also be resilient from any other Made of rubber material or a plastic material which can provide sealing properties. at the preferred embodiment of the rigid, cylindrical Sleeve part 14 is a tight fit with the second, rigid Sleeve part 16 provided, but there may also be any other types of connections or adhesive bonds, such as Welding, direct forging, or other types of connection or connecting devices can be used. The rigid cylindrical sleeve part 14 includes an inwardly facing End wall 20. The rigid, cylindrical sleeve part 14 also includes an outwardly projecting flange 22 one end of the same. The rigid, cylindrical sleeve part 14 also includes an outwardly directed gradation 44 an inner surface of the sleeve part 14.

Der federnd nachgiebige Dichtungskörper 18 ist direkt an der Stirnwand 20 des starren, zylindrischen Hülsenteils 14 angeformt. Der federnd nachgiebige Dichtungskörper 18 kann an die Stirnwand 20 derart angeformt sein, daß er die Stirnwand 20 vollständig umgibt. Jedoch können auch andere Ausformungsarten zum Verbinden des Dichtungskörpers 18 mit dem starren, zylindrischen Hülsenteil 14 eingesetzt werden. Es sollte noch erwähnt werden, daß andere Methoden, wie ein Festsitz, Epoxiharze oder andere Methoden eingesetzt werden können, welche ermöglichen, daß man eine feste Verbindung zwischen dem zylindrischen Hülsenteil 14 und dem federnd nachgiebigen Dichtungskörper 18 erhält. Die Kautschukauskleidung 28 ist ebenfalls auf der Innenwand des starren, zylindrischen Hülsenteils 14 angeformt und ist in Kontakt mit der Ventilführung 24 beim Einführen in einen Motorzylinderkopf oder einen Motorblock 26. Das starre, zylindrische Hülsenteil 14 hat einen Festsitz mit dem zweiten, zylindrischen Hülsenteil 16 und erzeugt eine Haltekraft, um die Kautschukauskleidung 28 in konstantem Kontakt mit der Ventilführungsanordnung 24 anzudrücken. Die vertikale Wand 30 des zweiten, starren, zylindrischen Hülsenteils 16 verhindert jede Möglichkeit, daß das Dichtungselement der Ventilschaftanordnung sich von der Ventilführung 24 während des Betriebs des Fahrzeugs lösen kann. Das zweite, starre Hülsenteil 16 bietet auch einen Schutz dahingehend, daß die Ventilfeder 32 vor einem Verschleiß in dem Zylinderkopf 26 während des Betriebszustandes geschützt wird.The resilient sealing body 18 is directly on the End wall 20 of the rigid, cylindrical sleeve part 14 is formed. The resilient sealing body 18 can on the end wall 20 may be formed in such a way that it forms the end wall 20 completely surrounds. However, other types of formation can also be used to connect the sealing body 18 with the rigid, cylindrical sleeve part 14 are used. It should be mentioned that other methods, such as a Fixed fit, epoxy resins or other methods can be used which can allow you to have a firm connection between the cylindrical sleeve part 14 and the resilient compliant seal body 18 receives. The rubber lining 28 is also on the inner wall of the rigid, cylindrical sleeve part 14 is formed and is in contact with the valve guide 24 when inserted into an engine cylinder head or an engine block 26. The rigid, cylindrical Sleeve part 14 has a tight fit with the second, cylindrical Sleeve part 16 and generates a holding force to the Rubber liner 28 in constant contact with the valve guide assembly 24 press. The vertical wall 30 of the second, rigid, cylindrical sleeve part 16 prevented any possibility that the sealing element of the valve stem assembly yourself from the valve guide 24 during the Operation of the vehicle can solve. The second, rigid sleeve part 16 also offers protection in that the Valve spring 32 before wear in the cylinder head 26 is protected during the operating state.

Das zweite, zylindrische Hülsenteil 16 umfaßt einen nach innen verlaufenden Flansch 34. Das zweite, zylindrische Hülsenteil 16 umfaßt auch einen Metallflansch oder einen Sitz 36, welcher in direktem Kontakt mit dem Motorblockkopf 26 ist und den Sitz für die Ventilfeder 32 bildet, so daß die Ventilfeder 32 während des Fahrzeugbetriebs im Zylinderkopf keinem Verschleiß ausgesetzt ist. Das zweite, starre, zylindrische Hülsenteil 16 wird gesondert von dem ersten, starren, zylindrischen Hülsenteil 14 der Ventilschaftdichtungsanordnung 10 hergestellt. Diese gesonderte Herstellungsweise ermöglicht, daß sich das Auftreten von internen Belastungen bei dem zweiten, starren, zylindrischen Hülsenteil 16 reduzieren läßt. Hierdurch wird ermöglicht, daß der Flansch 26 des zweiten, starren, zylindrischen Hülsenteils eine Ebenheit besitzt, welche sich genauer vorgeben läßt, wodurch sich die Häufigkeit des Auftretens von Rißbildungen am Flansch reduzieren läßt, wobei diese Rißbildung allgemein bei Ventilschaftdichtungen dieser Bauart eine Schwierigkeit darstellt. Da bei der Erfindung jedoch das zweite, starre, zylindrische Hülsenteil 16 gesondert von dem ersten, starren, zylindrischen Hülsenteil 14 und dem Dichtungsköper 18 hergestellt wird, lassen sich nach den Herstellungsvorgängen für die gesonderten Teile diese zu einer Ventilschaftdichtungsanordnung 10 zusammensetzen, welche bei einer Fahrzeugbrennkraftmaschine eingesetzt wird.The second, cylindrical sleeve part 16 comprises one after internal flange 34. The second, cylindrical Sleeve member 16 also includes a metal flange or one Seat 36, which is in direct contact with the engine block head Is 26 and forms the seat for the valve spring 32, so that the valve spring 32 in the cylinder head during vehicle operation is not exposed to wear. The second, rigid, cylindrical sleeve part 16 is separate from the first, rigid, cylindrical sleeve portion 14 of the valve stem seal assembly 10 manufactured. This separate manufacturing method allows the occurrence of internal Loads on the second, rigid, cylindrical sleeve part 16 can be reduced. This enables the Flange 26 of the second, rigid, cylindrical sleeve part has a flatness that can be specified more precisely, which increases the frequency of crack formation can reduce the flange, this cracking in general a problem with valve stem seals of this type represents. However, since in the invention the second, rigid, cylindrical sleeve part 16 separate from the first, rigid, cylindrical sleeve part 14 and the sealing body 18th is manufactured, can be made according to the manufacturing processes for the separate parts this to a valve stem seal arrangement 10 put together, which in a vehicle internal combustion engine is used.

Der federnd nachgiebige Dichtungskörper 18 umfaßt auch eine ringförmige Dichtlippe 38 am oberen Teil, welche eine konstante Dichtung mit dem Ventilschaft 14 während des Fahrzeugbetriebszustandes bereitstellt. Der federnd nachgiebige Dichtungskörper 18 umfaßt auch eine konkave Ausnehmung 42 entlang des oberen Teils des federnd nachgiebigen Dichtungskörpers 18. Die konkave Ausnehmung 42 nimmt ein Federteil 12 auf und hält dieses in seiner Position, welches die federnd nachgiebige, ringförmige Dichtlippe 38 in konstantem Kontakt gegen den Ventilschaft 40 während des Fahrzeugbetriebs andrückt. Diese Feder 12 und die ringförmige Dichtlippe 38 steuern die Ölmenge zwischen dem Ventilschaft 40 und der Ventilschaftdichtungsanordnung 10.The resilient sealing body 18 also includes one annular sealing lip 38 on the upper part, which is a constant Seal with the valve stem 14 during the vehicle operating condition provides. The resilient Seal body 18 also includes a concave recess 42 along the upper part of the resilient sealing body 18. The concave recess 42 takes a spring part 12 and holds it in its position, which is the springy compliant, annular sealing lip 38 in constant contact presses against the valve stem 40 during vehicle operation. This spring 12 and the annular sealing lip 38 control the amount of oil between the valve stem 40 and the Valve stem seal assembly 10.

Übliche Ventilschaftdichtungsanordnungen waren im Betriebszustand gezwungen, während des Arbeitens eines Kraftfahrzeugs und deren Brennkraftmaschine sich durch die Ventilfeder zu drehen. Hierdurch ist die Dichtlippe Torsionsbeanspruchungen ausgesetzt sowie Axialkräften von dem hin- und hergehend beweglichen Ventilschaft während des Arbeitens der Brennkraftmaschine. Bei der bevorzugten Auslegungsform der Ventilschaftdichtungsanordnung 10 jedoch ist während des Arbeitens der Brennkraftmaschine das erste, zylindrische, starre Hülsenteil 14 von dem zweiten, starren, zylindrischen Hülsenteil 16 getrennt, wodurch ermöglicht wird, daß das zweite, starre, zylindrische Hülsenteil 16 sich mit der Ventilfeder 12 drehen kann, aber sich die gesamte Ventilschaftdichtunganordnung 10 nicht mit der Ventilfeder 12 dreht. Dies führt dazu, daß das Dichtungselement 18 bezüglich des Ventilschafts 40 stationär ist, d.h. daß es sich nicht um den Ventilschaft 40 dreht. Hierdurch läßt sich der Verschleiß an der Dichtlippe reduzieren und die Standzeit der Ventilschaftdichtungsanordnung 10 läßt sich erhöhen. Auch ist eine bessere Steuerung der Ölzumessung während der Einsatzzeit der Dichtung einfacher, wennsich nicht die gesamte Ventilschaftdichtungsanordung dreht. Die Ventilschaftdichtungsanordnung 10 wird als eine Einheit eingebaut, da ein Festsitz zwischen dem ersten, starren, zylindrischen Hülsenteil 14 und dem zweiten, starren, zylindrischen Hülsenteil 16 vorgesehen ist. Die Trennung des ersten, starren, zylindrischen Hülsenteils 14 von dem zweiten, starren, zylindrischen Hülsenteils 16 tritt nur während des Brennkraftmaschinenbetriebs auf, wodurch nur ermöglicht wird, daß das zweite, starre, zylindrische Hülsenteil 16 eine Drehbewegung ausführt, während das erste, starre, zylindrische Hülsenteil 14 und der Dichtungskörper 18 um den Ventilschaft 40 stationär bleiben.Usual valve stem seal arrangements were in the operating state forced while working a motor vehicle and their internal combustion engine by the valve spring to turn. As a result, the sealing lip is subjected to torsional stresses exposed as well as axial forces to and fro moving valve stem while working the Internal combustion engine. In the preferred embodiment of the Valve stem seal assembly 10, however, is during the Working the internal combustion engine the first, cylindrical, rigid sleeve part 14 of the second, rigid, cylindrical Sleeve part 16 separated, allowing the second, rigid, cylindrical sleeve part 16 with the Valve spring 12 can rotate, but the entire valve stem seal assembly 10 not with the valve spring 12 rotates. This results in the sealing element 18 with respect of the valve stem 40 is stationary, i.e. that it is does not rotate around the valve stem 40. This allows the Reduce wear on the sealing lip and the service life the valve stem seal assembly 10 can be increased. There is also better control of the oil metering during the Use of the seal easier, if not the entire valve stem seal assembly rotates. The valve stem seal assembly 10 is installed as a unit, there is a tight fit between the first, rigid, cylindrical Sleeve part 14 and the second, rigid, cylindrical sleeve part 16 is provided. The separation of the first, rigid, cylindrical sleeve part 14 of the second, rigid, cylindrical Sleeve part 16 occurs only during engine operation on, which only enables the second, rigid, cylindrical sleeve part 16 a rotational movement executes while the first, rigid, cylindrical sleeve part 14 and the sealing body 18 stationary around the valve stem 40 stay.

Claims (15)

  1. A valve-stem seal arrangement for use in an internal combustion engine, which arrangement has the following:
    a first, rigid, cylindrical sleeve part (14) which has a flange (20) running radially inwards at the upper end of the sleeve part, and a flange (22) running outwards at the bottom end of the sleeve part (14);
    a second, rigid, cylindrical sleeve part (16) which has a seat (36) running outwards at the bottom end and a flange (34) running radially inwards at the other end, the first, rigid, cylindrical sleeve part (14) being in contact with an inner surface of the second, rigid, cylindrical sleeve part (16); and
    a resiliently flexible seal body (18) which is in contact with the first, rigid, cylindrical sleeve part (14) and in constant contact with a valve stem (40).
  2. A valve-stem seal arrangement according to Claim 1, characterized in that the first, rigid, cylindrical sleeve part (14) is produced from a metallic material.
  3. A valve-stem seal arrangement according to either of Claims 1 and 2, characterized in that the second, rigid, cylindrical sleeve part (16) is produced from a metallic material.
  4. A valve-stem seal arrangement according to any one of Claims 1 to 3, characterized in that the resiliently flexible seal body (18) is produced from a rubber material.
  5. A valve-stem seal arrangement according to any one of Claims 1 to 4, characterized in that furthermore a spring (12) is provided having a circumferential form which is used to press the resiliently flexible seal body (18) into contact with the valve stem (40).
  6. A valve-stem seal arrangement according to any one of Claims 1 to 5, characterized in that furthermore an annular sealing lip (38) is provided on an upper section of the resiliently flexible seal body (18).
  7. A valve-stem seal arrangement according to any one of the preceding claims, characterized in that the resiliently flexible seal body (18) is connected in a directly adhering manner to the first, rigid, cylindrical sleeve part (14).
  8. A valve-stem seal arrangement according to any one of Claims 1 to 7, characterized in that the first, cylindrical sleeve part (14) and the second, cylindrical sleeve part (16) are connected by means of an interference fit.
  9. A valve-stem seal arrangement according to any one of Claims 1 to 7, characterized in that the interference fit makes it possible for the second, cylindrical, rigid sleeve part (16) to be able to rotate with a valve spring (32), while the first, rigid, cylindrical sleeve part (14) is stationary with respect to the valve spring (32) with regard to a rotational movement.
  10. A valve-stem seal arrangement according to Claim 9, characterized in that during operation of the internal combustion engine the second, rigid, cylindrical sleeve part (16) is rotated by a valve spring (32), and in that the resiliently flexible seal body (18) and the first, rigid, cylindrical sleeve part (14) are stationary with regard to the valve spring (32) with regard to a rotational movement.
  11. A valve-stem seal arrangement according to any one of the preceding claims, characterized in that the first, rigid, cylindrical sleeve part (14) is in contact with an inner surface of the second, rigid, cylindrical sleeve part (16), in that the resiliently flexible seal body (18) includes an annular sealing lip (38) on the upper section and an annularly raised section at the bottom end, and in that the resiliently flexible seal body (18) is in constant contact with a valve guide and a valve stem (40).
  12. A valve-stem seal arrangement according to any one of claims 5 to 11 , characterized in that the spring (12) is annular in form.
  13. A valve-stem seal arrangement according to any one of the preceding claims, characterized in that the second, cylindrical sleeve part (16) rotates independently of the first, cylindrical sleeve part (14).
  14. A valve-stem seal arrangement according to any one of the preceding claims, characterized in that the second, cylindrical sleeve part (16) forms a seat for a valve spring (32).
  15. A valve-stem seal arrangement according to Claim 14, characterized in that the second, cylindrical sleeve part (16) rotates with the valve spring (32).
EP97114653A 1997-05-07 1997-08-23 Two-part valve stem seal Expired - Lifetime EP0877150B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/852,836 US5775284A (en) 1997-05-07 1997-05-07 Two-piece valve stem seal
US852836 1997-05-07

Publications (2)

Publication Number Publication Date
EP0877150A1 EP0877150A1 (en) 1998-11-11
EP0877150B1 true EP0877150B1 (en) 2002-04-03

Family

ID=25314349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97114653A Expired - Lifetime EP0877150B1 (en) 1997-05-07 1997-08-23 Two-part valve stem seal

Country Status (6)

Country Link
US (1) US5775284A (en)
EP (1) EP0877150B1 (en)
AT (1) ATE215666T1 (en)
DE (1) DE59706866D1 (en)
DK (1) DK0877150T3 (en)
ES (1) ES2175236T3 (en)

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Also Published As

Publication number Publication date
EP0877150A1 (en) 1998-11-11
US5775284A (en) 1998-07-07
ATE215666T1 (en) 2002-04-15
DE59706866D1 (en) 2002-05-08
ES2175236T3 (en) 2002-11-16
DK0877150T3 (en) 2002-07-29

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