EP0704614A1 - Valve cover - Google Patents

Valve cover Download PDF

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Publication number
EP0704614A1
EP0704614A1 EP95114436A EP95114436A EP0704614A1 EP 0704614 A1 EP0704614 A1 EP 0704614A1 EP 95114436 A EP95114436 A EP 95114436A EP 95114436 A EP95114436 A EP 95114436A EP 0704614 A1 EP0704614 A1 EP 0704614A1
Authority
EP
European Patent Office
Prior art keywords
valve cover
valve
hood
cover
fastening elements
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
EP95114436A
Other languages
German (de)
French (fr)
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EP0704614B1 (en
Inventor
Roderich Dr. Kammerer
Frank Krause
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Bayer AG
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Bayer AG
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Publication date
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Publication of EP0704614A1 publication Critical patent/EP0704614A1/en
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Publication of EP0704614B1 publication Critical patent/EP0704614B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F5/00—Piston rings, e.g. associated with piston crown
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/06—Polyamides, e.g. NYLON
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/18—Filler

Definitions

  • the invention relates to an acoustically decoupled valve cover for internal combustion engines based on plastic or metal as a cover material with an elastic plastic seal as a sealing material and connecting elements with disc springs, which acoustically decouple the valve cover from the motor housing.
  • Valve covers cover the camshafts of internal combustion engines.
  • the connection to the cylinder head is usually sealed with a seal on the underside of the hood. This seal is pretensioned by fastening screws on the cylinder head in order to apply the surface pressure required to seal the connection between the valve cover and the cylinder head.
  • the valve cover is traditionally made of aluminum. Sometimes, if the hood shape and the fastening concept allow it, plastic is also used, e.g. Polyamide.
  • plastic e.g. Polyamide.
  • the use of plastic as the hood material is advantageous over the use of metal, in particular aluminum, since this saves production costs, the hood has a lower weight and a better surface quality.
  • valve cover material has proven to be disadvantageous in the case of previously known valve cover designs for the following reasons:
  • the preload load case occurs long-term (i.e. over 103 - 104 hours) in connection with high temperature fluctuations (from -40 ° C - 140 ° C) or also with time-lapse testing within 103 h and a temperature of 130 - 150 ° C.
  • a high temperature and the longevity of the load prove to be unfavorable for thermoplastics and the creep of the material is accelerated.
  • Creep is understood here to mean a permanent change in shape resulting in a loss of pretension until leakage of the valve cover occurs.
  • the fastening screws would have to be tightened at regular intervals to compensate, but this is not possible for various reasons.
  • decoupling elements mentioned are comparatively expensive to manufacture. Since they also have a soft intermediate layer made of an elastomer, they increase the risk of a loss of pre-stress due to settling and creeping effects. This makes it clear that e.g. decoupled plastic hoods have not been used so far.
  • the object of the invention is to provide an acoustically decoupled valve cover, in particular made of plastic, preferably thermoplastic plastic, as the cover material, which does not have the disadvantages mentioned and in particular enables acoustic decoupling while at the same time maintaining the pretension for as long a period as possible.
  • an acoustically decoupled valve cover for internal combustion engines based on plastic, in particular thermoplastic, or metal, in particular aluminum, magnesium, steel or titanium, particularly preferably made of glass fiber reinforced polyamide-66, with an elastic plastic seal as the sealing material and one or a plurality of connecting elements, preferably screws, for connecting the valve cover to the engine housing, in which fastening elements with disk springs that pass on the pretensioning of the fastening elements to the valve cover are underlaid on the engine housing for fastening the valve cover, a horizontal characteristic curve in the force / spring travel curve have (corresponding to a spring rate of 0) and in which the plate springs are guided in a seat of the valve cover.
  • the fastening elements and the disk spring seat of the valve cover are provided with additional contact surfaces for the disk springs.
  • FIG. 2 The structure shown in FIG. 2 is described by way of example for a central screw connection.
  • the valve cover 1 is connected to the housing of the engine block 2 underneath by means of a fastening screw 4 which is underlaid with a plate spring 5.
  • the sealing of the valve cover 1 with the aid of the seal 3 can be effected using the usual temperature-resistant sealing materials.
  • silicone seals e.g. Siloprene LSR 2030, Bayer, have proven to be advantageous acoustic decoupling elements.
  • the fastening screw 4 can have a small shoulder 8 at the upper end of the screw shaft in order to prevent premature application of the plate spring on the underside of the screw head.
  • a support surface 7 can also be provided in the disc spring seat 6 of the valve cover. Any additional sealing membrane 9 to be used can prevent oil from escaping in the area of the fastening elements.
  • the inside diameter of the plate spring can also be designed according to the detail in FIG. 3.
  • valve covers for example flange screw connections
  • flange screw connections the cost advantage over known valve covers is increased due to the larger number of fastening elements required.
  • the central screw connection shown there is another effect that would otherwise be due to different coefficients of thermal expansion between the plastic (the valve cover) and the Cast iron or aluminum (of the motor housing) eliminates the inevitable temperature dependence of the preload.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Bolts, Nuts, And Washers (AREA)
  • Gasket Seals (AREA)
  • Check Valves (AREA)

Abstract

The valve hood (1), to shroud the camshafts in a combustion motor, is of metal or plastics with an elastic plastics sealing (3). One or more mountings (4) secure the hood (1) to the motor case (2), together with plate springs (5) for tension to be transferred to the hood (1). At the working point, the plate springs (5) have a horizontal characteristic in the force/spring path characteristics. The plate springs (5) fit in a set (6) in the valve hood (1). The hood material is a thermoplastic material such as polyamide with glass fibre reinforcement, or of aluminium, magnesium, steel or titanium. The sealing (3) is of silicon with a low Shore hardness.

Description

Die Erfindung betrifft eine akustisch entkoppelte Ventilhaube für Verbrennungsmotoren auf Basis von Kunstoff oder Metall als Haubenmaterial mit einer elastischen Kunststoffdichtung als Dichtmaterial und Verbindungselementen mit Tellerfedern, die die Ventilhaube vom Motorgehäuse akustisch entkoppeln.The invention relates to an acoustically decoupled valve cover for internal combustion engines based on plastic or metal as a cover material with an elastic plastic seal as a sealing material and connecting elements with disc springs, which acoustically decouple the valve cover from the motor housing.

Ventilhauben decken die Nockenwellen von Verbrennungsmotoren ab. Auf der Haubenunterseite wird üblicherweise die Verbindung zum Zylinderkopf mit einer Dichtung abgedichtet. Diese Dichtung wird durch Befestigungsschrauben auf dem Zylinderkopf vorgespannt, um die erforderliche Flächenpressung zum Abdichten der Verbindung zwischen Ventilhaube und Zylinderkopf aufzubringen.Valve covers cover the camshafts of internal combustion engines. The connection to the cylinder head is usually sealed with a seal on the underside of the hood. This seal is pretensioned by fastening screws on the cylinder head in order to apply the surface pressure required to seal the connection between the valve cover and the cylinder head.

Traditionell wird die Ventilhaube aus Aluminium gefertigt. Bisweilen wird, wenn die Haubenform und das Befestigungskonzept es zulassen, auch Kunststoff eingesetzt, z.B. Polyamid. Der Einsatz von Kunststoff als Haubenmaterial ist vorteilhaft gegenüber dem Einsatz von Metall, insbesondere Aluminium, da hierbei Herstellungskosten eingespart werden, die Haube ein niedrigeres Gewicht und eine bessere Oberflächenqualität aufweist.The valve cover is traditionally made of aluminum. Sometimes, if the hood shape and the fastening concept allow it, plastic is also used, e.g. Polyamide. The use of plastic as the hood material is advantageous over the use of metal, in particular aluminum, since this saves production costs, the hood has a lower weight and a better surface quality.

Neuere verstärkte Anforderungen der Reduzierung der Schallemmission von Verbrennungsmotoren erfordern eine akustische Entkopplung der Ventilhaube vom Motorgehäuse. Diese Entkopplung betrifft die beiden Schalleitungspfade, nämlich die Dichtung einerseits, und die Schraubenbefestigungen der Ventilhaube andererseits. Die Entkopplung wird bei der Dichtung durch entsprechend weiches Dichtungsmaterial und bei der Befestigung der Haube durch sogenannte Entkopplungselemente unter den Befestigungsschrauben erreicht.More recent increased requirements for reducing the noise emission of internal combustion engines require an acoustic decoupling of the valve cover from the engine housing. This decoupling affects the two shutter cable paths, namely the seal on the one hand, and the screw fastenings of the valve cover on the other. Decoupling is achieved in the seal by means of correspondingly soft sealing material and in the case of fastening the hood by means of so-called decoupling elements under the fastening screws.

Die Verwendung, insbesondere von Kunststoff als Ventilhaubenmaterial, erweist sich aus den folgenden Gründen bei bisher bekannten Ventilhaubenkonstruktionen als nachteilhaft:The use, in particular of plastic, as a valve cover material has proven to be disadvantageous in the case of previously known valve cover designs for the following reasons:

Der Lastfall Vorspannung tritt langzeitig (d.h. über 10³ - 10⁴ Stunden) in Verbindung mit hohen Temperaturschwankungen (von -40°C - 140°C) oder auch bei Zeitrafferprüfung innerhalb von 10³ h und einer Temperatur von 130 - 150°C auf. Eine hohe Temperatur und die Langzeitigkeit der Belastung erweisen sich als für Thermoplaste ungünstig und das Kriechen des Materials wird dabei beschleunigt. Unter Kriechen wird hierbei eine bleibende Formänderung mit der Folge eines Vorspannungsverlustes bis zum Eintritt der Leckage der-Ventilhaube verstanden. In der Praxis müßten daher als Ausgleich die Befestigungsschrauben in regelmäßigen Intervallen nachgezogen werden, was sich aber aus unterschiedlichen Gründen verbietet.The preload load case occurs long-term (i.e. over 10³ - 10⁴ hours) in connection with high temperature fluctuations (from -40 ° C - 140 ° C) or also with time-lapse testing within 10³ h and a temperature of 130 - 150 ° C. A high temperature and the longevity of the load prove to be unfavorable for thermoplastics and the creep of the material is accelerated. Creep is understood here to mean a permanent change in shape resulting in a loss of pretension until leakage of the valve cover occurs. In practice, the fastening screws would have to be tightened at regular intervals to compensate, but this is not possible for various reasons.

Die genannten Entkopplungselemente sind vergleichsweise teuer in der Herstellung. Da sie auch eine weiche Zwischenschicht aus einem Elastomer haben, verstärken sie durch Setz- und Kriecheffekte die Gefahr eines Vorspannungsverlustes. Hierdurch wird klar, daß z.B. entkoppelte Kunststoffhauben bislang nicht zum Einsatz gekommen sind.The decoupling elements mentioned are comparatively expensive to manufacture. Since they also have a soft intermediate layer made of an elastomer, they increase the risk of a loss of pre-stress due to settling and creeping effects. This makes it clear that e.g. decoupled plastic hoods have not been used so far.

Aufgabe der Erfindung ist es, eine akustisch entkoppelte Ventilhaube bereitzustellen, insbesondere aus Kunststoff, bevorzugt thermoplastischem Kunststoff, als Haubenmaterial, die die genannte Nachteile nicht aufweist und insbesondere die akustische Entkopplung bei gleichzeitigem Erhalt der Vorspannung über einen möglichst langen Zeitraum ermöglicht.The object of the invention is to provide an acoustically decoupled valve cover, in particular made of plastic, preferably thermoplastic plastic, as the cover material, which does not have the disadvantages mentioned and in particular enables acoustic decoupling while at the same time maintaining the pretension for as long a period as possible.

Die Aufgabe wird erfindungsgemäß gelöst durch eine akustisch entkoppelte Ventilhaube für Verbrennungsmotoren auf Basis von Kunststoff, insbesondere thermoplastischem Kunststoff, oder Metall, insbesondere Aluminium, Magnesium, Stahl oder Titan, besonders bevorzugt aus glasfaservertärktem Polyamid-66, mit einer elastischen Kunststoffdichtung als Dichtungsmaterial und einen oder mehreren Verbindungselementen, bevorzugt Schrauben, zur Verbindung der Ventilhaube mit dem Motorgehäuse, bei der zur Befestigung der Ventilhaube auf dem Motorgehäuse Befestigungselemente mit Tellerfedern unterlegt sind, die die Vorspannung der Befestigungselemente an die Ventilhaube weitergeben, im Betriebspunkt einen horizontalen Kennlinienverlauf in der Kraft/Federweg-Kennlinie aufweisen (entsprechend eienr Federrate von 0) und bei der die Tellerfedern in einem Sitz der Ventilhaube geführt werden.The object is achieved according to the invention by an acoustically decoupled valve cover for internal combustion engines based on plastic, in particular thermoplastic, or metal, in particular aluminum, magnesium, steel or titanium, particularly preferably made of glass fiber reinforced polyamide-66, with an elastic plastic seal as the sealing material and one or a plurality of connecting elements, preferably screws, for connecting the valve cover to the engine housing, in which fastening elements with disk springs that pass on the pretensioning of the fastening elements to the valve cover are underlaid on the engine housing for fastening the valve cover, a horizontal characteristic curve in the force / spring travel curve have (corresponding to a spring rate of 0) and in which the plate springs are guided in a seat of the valve cover.

In einer bevorzugten Ausführungsform sind die Befestigungselemente sowie der Tellerfedersitz der Ventilhaube mit zusätzlichen Auflageflächen für die Tellerfedern versehen.In a preferred embodiment, the fastening elements and the disk spring seat of the valve cover are provided with additional contact surfaces for the disk springs.

Durch den Einsatz der Tellerfedern bei der erfindungsgemäßen Ventilhaube wird zum einen eine akustische Trennung der Haube von den Befestigungsschrauben erreicht, da die Federkonstante am Betriebspunkt der Tellerfeder etwa 0 ist. Desweiteren wird eine Kompensation eines Vorspannungsverlustes erreicht. Der Vorspannungsverlust der Kunststoffhaube aufgrund von Materialermüdung als Funktion der Temperatur und Zeit, bewirkt lediglich, daß der Betriebspunkt im Kraft-Vorspannungsdiagramm der Tellerfeder (s. Fig. 1) nach links ausweicht ohne daß aber die Vorspannkraft geringer wird. Hierbei wird die Dichtfunktion der Ventilhaube unverändert erhalten. Ein weiterer Vorteil des Einsatzes von Tellerfedern gemäß der Erfindung besteht darin, daß die Tellerfedern in der Herstellung vorsichtig geschätzt um eine Größenordnung preisgünstiger sind als übliche Entkopplungselemente. Sie weisen zudem einen geringeren Platzbedarf auf.By using the plate springs in the valve cover according to the invention, an acoustic separation of the cover from the fastening screws is achieved on the one hand, since the spring constant at the operating point of the plate spring is approximately 0. Furthermore, compensation for a loss of bias is achieved. The loss of preload in the plastic hood due to material fatigue as a function of temperature and time only causes the operating point in the force-preload diagram of the disc spring (see FIG. 1) to move to the left without, however, reducing the preload force. The sealing function of the valve cover is retained unchanged. Another advantage of using disc springs according to the invention is that the disc springs are carefully estimated to be an order of magnitude cheaper to manufacture than conventional decoupling elements. They also require less space.

Die Erfindung wird im folgenden anhand der Figuren beispielhaft näher erläutert.The invention is explained in more detail below using the figures as an example.

In den Figuren zeigen

Fig. 1
ein schematisches Federkraft-Vorspannungsdiagramm einer Tellerfeder,
Fig. 2
eine Schnittzeichnung der erfindungsgemäßen Ventilhaube,
Fig. 3
eine bevorzugte Tellerfederform bei der Verwendung von Standardschrauben.
Show in the figures
Fig. 1
1 shows a schematic spring force preload diagram of a plate spring,
Fig. 2
2 shows a sectional drawing of the valve cover according to the invention,
Fig. 3
a preferred diaphragm spring shape when using standard screws.

Der in Fig. 2 gezeigte Aufbau ist beispielhaft für eine Zentralverschraubung beschrieben. Die Ventilhaube 1 wird über eine mit einer Tellerfeder 5 unterlegte Befestigungsschraube 4 mit dem Gehäuse des darunter befindlichen Motorblocks 2 verbunden. Die Abdichtung der Ventilhaube 1 mit Hilfe der Dichtung 3 kann unter Verwendung der üblichen temperaturbeständigen Dichtungsmaterialien bewirkt werden. Hierbei haben sich wegen der erreichbaren niedrigen Shorehärten, insbesondere Silikondichtungen, z.B.. Silopren LSR 2030, Firma Bayer, als vorteilhafte akustische Entkopplungsglieder erwiesen.The structure shown in FIG. 2 is described by way of example for a central screw connection. The valve cover 1 is connected to the housing of the engine block 2 underneath by means of a fastening screw 4 which is underlaid with a plate spring 5. The sealing of the valve cover 1 with the aid of the seal 3 can be effected using the usual temperature-resistant sealing materials. Here, because of the achievable low Shore hardness, in particular silicone seals, e.g. Siloprene LSR 2030, Bayer, have proven to be advantageous acoustic decoupling elements.

Die Befestigungsschraube 4 kann in einer in Fig. 2 gezeigten Variante einen kleinen Absatz 8 am oberen Ende des Schraubenschaftes haben, um ein vorzeitiges Anlegen der Tellerfeder auf die Unterseite des Schraubenkopfes zu verhindern. Entsprechend kann auch im Tellerfedersitz 6 der Ventilhaube eine Auflagefläche 7 vorgesehen sein. Eine gegebenenfalls einzusetzende zusätzliche Dichtmembran 9 kann im Bereich der Befestigungselemente den Austritt von Öl verhindern.In a variant shown in FIG. 2, the fastening screw 4 can have a small shoulder 8 at the upper end of the screw shaft in order to prevent premature application of the plate spring on the underside of the screw head. Correspondingly, a support surface 7 can also be provided in the disc spring seat 6 of the valve cover. Any additional sealing membrane 9 to be used can prevent oil from escaping in the area of the fastening elements.

Bei der Verwendung genormter Standardschrauben kann man auch den Innendurchmesser der Tellerfeder gemäß dem Detail in Fig. 3 ausbilden.When using standard standard screws, the inside diameter of the plate spring can also be designed according to the detail in FIG. 3.

Unabhängig von der in Fig. 2 gezeigten Ausführungsform können auch andere Befestigungsarten von Ventilhauben, z.B. Flanschverschraubungen erfindungsgemäß vorgesehen werden. Bei der Flanschverschraubung wird der Kostenvorteil gegenüber bekannten Ventilhauben verstärkt aufgrund der größeren Zahl von erforderlichen Befestigungselementen. Bei der gezeigten Zentralverschraubung wird als weiterer Effekt, die sonst aufgrund unterschiedlicher Wärmeausdehnungskoeffizienten zwischen dem Kunststoff (der Ventilhaube) und dem Gußeisen bzw. Aluminium (des Motorgehäuse) unvermeidliche Temperaturabhängigkeit der Vorspannung eliminiert.Independently of the embodiment shown in FIG. 2, other types of fastening of valve covers, for example flange screw connections, can also be provided according to the invention. In the case of flange screwing, the cost advantage over known valve covers is increased due to the larger number of fastening elements required. In the central screw connection shown, there is another effect that would otherwise be due to different coefficients of thermal expansion between the plastic (the valve cover) and the Cast iron or aluminum (of the motor housing) eliminates the inevitable temperature dependence of the preload.

Claims (6)

Akustisch entkoppelte Ventilhaube (1) für Verbrennungsmotoren auf Basis von Kunststoff oder Metall als Haubenmaterial mit einer elastischen Kunststoffdichtung (3) als Dichtmaterial und einem oder mehreren Verbindungselementen (4), bei der zur Befestigung der Ventilhaube (1) auf dem Motorgehäuse (2) die Befestigungselemente (4) mit Tellerfedern (5) unterlegt sind, die die Vorspannung der Befestigungselemente (4) an die Ventilhaube (1) weitergeben, die Tellerfedern (5) im Betriebspunkt einen horizontalen Kennlinienverlauf in der Kraft/Federweg-Kennlinie aufweisen und bei der die Tellerfedern (5) in einem Sitz (6) der Ventilhaube (1) geführt werden.Acoustically decoupled valve cover (1) for internal combustion engines based on plastic or metal as cover material with an elastic plastic seal (3) as sealing material and one or more connecting elements (4), in which the valve cover (1) is attached to the motor housing (2) Fastening elements (4) are underlaid with disc springs (5) which pass on the pretensioning of the fastening elements (4) to the valve cover (1), the disc springs (5) have a horizontal characteristic curve in the force / spring characteristic at the operating point and at which the Disc springs (5) are guided in a seat (6) of the valve cover (1). Ventilhaube nach Anspruch 1, dadurch gekennzeichnet, daß als Haubenmaterial ein thermoplastischer Kunststoff oder Aluminium, Magnesium, Stahl oder Titan eingesetzt wird.Valve cover according to claim 1, characterized in that a thermoplastic or aluminum, magnesium, steel or titanium is used as the cover material. Ventilhaube nach Anspruch 1, dadurch gekennzeichnet, daß das Haubenmaterial glasfaserverstärktes Polyamid ist.Valve cover according to claim 1, characterized in that the cover material is glass fiber reinforced polyamide. Ventilhaube nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß als Befestigungselemente (4) Schrauben eingesetzt werden, die eine zusätzliche Auflagefläche (8) aufweisen.Valve cover according to claims 1 to 3, characterized in that screws are used as fastening elements (4) which have an additional contact surface (8). Ventilhaube nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Sitz (6) der Ventilhaube (1) zur Führung der Tellerfeder (5) eine zusätzliche Auflagefläche (7) aufweist.Valve cover according to claims 1 to 4, characterized in that the seat (6) of the valve cover (1) for guiding the plate spring (5) has an additional contact surface (7). Ventilhabe nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß als Dichtungsmaterial für die Ventilhaubendichtung (3) Silikon mit niedriger Shorehärte eingesetzt wird.Valve holder according to Claims 1 to 5, characterized in that silicone with a low Shore hardness is used as the sealing material for the valve cover seal (3).
EP95114436A 1994-09-27 1995-09-14 Valve cover Expired - Lifetime EP0704614B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4434453 1994-09-27
DE4434453A DE4434453C2 (en) 1994-09-27 1994-09-27 Valve cover

Publications (2)

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EP0704614A1 true EP0704614A1 (en) 1996-04-03
EP0704614B1 EP0704614B1 (en) 1998-03-25

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US (1) US5655489A (en)
EP (1) EP0704614B1 (en)
JP (1) JP3683014B2 (en)
KR (1) KR100385249B1 (en)
DE (2) DE4434453C2 (en)
ES (1) ES2113703T3 (en)

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US6085709A (en) * 1998-12-10 2000-07-11 Detroit Diesel Corporation Engine rocker arm cover having reduced noise transmission
DE19910467C1 (en) * 1999-03-10 2000-10-19 Schott Glas Holder and method for producing a holder for essentially flat molded articles made of brittle material
DE10119892C2 (en) * 2001-04-24 2003-04-03 Skf Ab Cover, in particular for damping the noise of an internal combustion engine
US20040121674A1 (en) * 2002-12-18 2004-06-24 Robbins Jeffrey R. Composite engine component and method for making the same
US20050132997A1 (en) * 2003-12-18 2005-06-23 Marcus Vargas Customization cover for engine valve covers
US20050220564A1 (en) * 2004-04-01 2005-10-06 Hinson Kerry D Fastener assembly with wave spring
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US7255079B2 (en) * 2004-10-18 2007-08-14 Federal-Mogul World Wide, Inc. Flanged cover assembly with flange pressure distribution compensator
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EP0070500A1 (en) * 1981-07-16 1983-01-26 Nissan Motor Co., Ltd. Rocker cover assembly
US4456268A (en) * 1982-09-30 1984-06-26 Allis-Chalmers Corp. Fastening means in sealed gasket assembly including shoulder bolt
US4571133A (en) * 1984-07-23 1986-02-18 General Motors Corporation Loading washer assembly

Also Published As

Publication number Publication date
EP0704614B1 (en) 1998-03-25
KR100385249B1 (en) 2003-08-14
US5655489A (en) 1997-08-12
DE4434453A1 (en) 1996-04-04
DE59501693D1 (en) 1998-04-30
DE4434453C2 (en) 1996-07-18
ES2113703T3 (en) 1998-05-01
JPH08114154A (en) 1996-05-07
JP3683014B2 (en) 2005-08-17
KR960011102A (en) 1996-04-20

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