EP0664388A1 - Rocker cover - Google Patents

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Publication number
EP0664388A1
EP0664388A1 EP95100584A EP95100584A EP0664388A1 EP 0664388 A1 EP0664388 A1 EP 0664388A1 EP 95100584 A EP95100584 A EP 95100584A EP 95100584 A EP95100584 A EP 95100584A EP 0664388 A1 EP0664388 A1 EP 0664388A1
Authority
EP
European Patent Office
Prior art keywords
cover
spring body
housing cover
spring
cover according
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
EP95100584A
Other languages
German (de)
French (fr)
Other versions
EP0664388B1 (en
Inventor
Bernd Dipl.-Ing. Stephan
Bernhard Dipl.-Ing. Feldmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF Sealing Solutions GmbH
Original Assignee
CR Elastomere GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CR Elastomere GmbH filed Critical CR Elastomere GmbH
Publication of EP0664388A1 publication Critical patent/EP0664388A1/en
Application granted granted Critical
Publication of EP0664388B1 publication Critical patent/EP0664388B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02F11/00—Arrangements of sealings in combustion engines 

Definitions

  • the invention relates to a housing cover, in particular an oil pan or valve cover, for releasable, liquid-tight fastening to the engine block of internal combustion engines, the cover having holes for fastening screws provided with rubber sleeves in order to produce a sufficient pretensioning force on an elastomeric seal running on the edge of the cover.
  • EP 0 218 200 B1 discloses a generic valve cover for the cylinder head of an internal combustion engine.
  • the cover has holes in its base for the passage of threaded bolts designed as stud bolts. Rubber sleeves extend in the holes. On the one hand, these serve to seal the stud bolts and, on the other hand, they dampen the transmission of structure-borne noise.
  • a defined pretensioning force is also generated in the rubber sleeves, so that the seal on the edge of the cover is pressed onto the engine block with a certain force.
  • the rubber sleeves act as rubber springs and ensure that an adequate seal is created.
  • the invention has for its object to improve a generic housing cover with regard to the sealing effect of the seal on the edge of the lid.
  • This object is achieved in that a metallic spring body is provided to adjust the biasing force. In this way, a spring effect is achieved that generates a sufficient preload over the entire operating time.
  • the spring body is preferably supported on the outer surface of the cover.
  • a defined pretensioning force can be generated, the spring body being connected to the rubber sleeve in such a way that the fastening screw is supported axially on the spring body.
  • the spring body should preferably be made of steel.
  • the spring body as a leaf spring.
  • Other spring bodies which are formed for example from spring band steel, could also be used.
  • the spring body should have a sound-absorbing pad at least in the area of contact with the cover.
  • FIG. 1 shows a housing cover (1) in the form of a valve cover for internal combustion engines.
  • the housing cover (1) is made of aluminum.
  • an elastomer seal (4) is arranged on the edge of the cover (3).
  • several holes (5) are arranged around the circumference, through which stud bolts (6) extend.
  • Rubber sleeves (7) which are attached to the cover (1), are used to seal the stud bolts. are connected.
  • the rubber sleeves (7) can be vulcanized in or pressed in.
  • a spring body (8) made of steel strip is positively connected to the rubber sleeve (7).
  • the spring body (8) is supported on the metal surface (9) of the cover (1).
  • the spring body (8) is pressed axially and thus generates a pretensioning force on the seal (4). Since the spring body (8) is made of metal, the contact pressure remains largely constant over a long period and over a wide temperature range. In contrast to the rubber sleeve (7), no aging occurs. In addition, this spring body (8) can compensate for a flow / setting of the seal (4).
  • a thin sound-absorbing layer (11) can be applied to the underside of the spring body (8) for sound absorption.

Landscapes

  • 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)
  • Motor Or Generator Frames (AREA)
  • Bolts, Nuts, And Washers (AREA)

Abstract

The cover (1), particularly a sump or valve-cover, contains rubber bushes (7) in holes for fixing screws (10). Pre-loading of an elastomer seal (4) running along the cover edge is adjusted by a metal spring (8), which can be supported on the metal surface (9) of the cover. The screws can bear against the spring in their axial direction. The bushes can be fixed to the spring, which can be of steel and of the leaf type. It can have a sound-dampening coating (11) where it bears against the cover.

Description

Die Erfindung betrifft einen Gehäusedeckel, insbesondere Ölwanne oder Ventildeckel, zum lösbaren, flüssigkeitsdichten Befestigen am Motorblock von Brennkraftmaschinen, wobei der Deckel mit Gummihülsen versehene Löcher für Befestigungsschrauben aufweist, um auf einer am Rand des Deckels verlaufenden elastomeren Dichtung eine hinreichende Vorspannkraft zu erzeugen.The invention relates to a housing cover, in particular an oil pan or valve cover, for releasable, liquid-tight fastening to the engine block of internal combustion engines, the cover having holes for fastening screws provided with rubber sleeves in order to produce a sufficient pretensioning force on an elastomeric seal running on the edge of the cover.

Die EP 0 218 200 B1 offenbart einen gattungsgemäßen Ventildeckel für den Zylinderkopf eines Verbrennungsmotors. Der Deckel hat in seinem Boden Löcher zur Durchführung von als Stehbolzen ausgebildeten Gewindebolzen. In den Löchern erstrecken sich Gummihülsen. Diese dienen zum einen zur Abdichtung der Stehbolzen und zum anderen bewirken sie eine Dämpfung bei der Übertragung von Körperschall. Beim Abziehen der Muttern auf den Gewindebolzen wird darüber hinaus eine definierte Vorspannkraft in den Gummihülsen erzeugt, so daß die Dichtung am Deckelrand mit einer bestimmten Kraft am Motorblock verpreßt wird. Die Gummihülsen fungieren als Gummifedern und sorgen dafür, daß eine hinreichende Abdichtung erzeugt wird.EP 0 218 200 B1 discloses a generic valve cover for the cylinder head of an internal combustion engine. The cover has holes in its base for the passage of threaded bolts designed as stud bolts. Rubber sleeves extend in the holes. On the one hand, these serve to seal the stud bolts and, on the other hand, they dampen the transmission of structure-borne noise. When the nuts are removed from the threaded bolt, a defined pretensioning force is also generated in the rubber sleeves, so that the seal on the edge of the cover is pressed onto the engine block with a certain force. The rubber sleeves act as rubber springs and ensure that an adequate seal is created.

Es hat sich nun gezeigt, daß bei einigen Anwendungsfällen die Gummifederkraft nicht ausreicht für eine hinreichende Dichtpressung in der Dichtung. Auch mit zunehmender Betriebszeit läßt die Kraft in den Gummifedern nach, wodurch die Dichtwirkung der Dichtung am Deckelrand nachläßt.It has now been shown that in some applications the rubber spring force is not sufficient for sufficient sealing pressure in the seal. Even with increasing operating time, the force in the rubber springs decreases, which reduces the sealing effect of the seal on the edge of the lid.

Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Gehäusedeckel im Hinblick auf die Dichtwirkung der Dichtung am Deckelrand zu verbessern.The invention has for its object to improve a generic housing cover with regard to the sealing effect of the seal on the edge of the lid.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zur Einstellung der Vorspannkraft ein metallischer Federkörper vorgesehen ist. Auf diese Weise wird eine Federwirkung erzielt, die über die gesamte Betriebszeit eine ausreichende Vorspannkraft erzeugt.This object is achieved in that a metallic spring body is provided to adjust the biasing force. In this way, a spring effect is achieved that generates a sufficient preload over the entire operating time.

Der Federkörper stützt sich vorzugsweise auf der Mantelfläche des Deckels ab. Beim Anziehen der Befestigungsschrauben oder Muttern kann eine definierte Vorspannkraft erzeugt werden, dabei ist der Federkörper derart mit der Gummihülse verbunden, daß die Befestigungsschraube sich auf dem Federkörper axial abstützt.The spring body is preferably supported on the outer surface of the cover. When the fastening screws or nuts are tightened, a defined pretensioning force can be generated, the spring body being connected to the rubber sleeve in such a way that the fastening screw is supported axially on the spring body.

Es ist von Vorteil, wenn die Gummihülsen mit dem Federkörper verbunden sind, da auf diese Weise die Montage erleichtert wird. Der Federkörper sollte vorzugsweise aus Stahl bestehen.It is advantageous if the rubber sleeves are connected to the spring body, since this makes assembly easier. The spring body should preferably be made of steel.

Denkbar wäre, den Federkörper als Blattfeder auszubilden. Andere Federkörper, die beispielsweise aus Federbandstahl gebildet sind, könnten auch zur Anwendung gelangen.It would be conceivable to design the spring body as a leaf spring. Other spring bodies, which are formed for example from spring band steel, could also be used.

Damit eine ausreichende Schalldämpfung während des Betriebes der Brennkraftmaschine gegeben ist, sollte der Federkörper mindestens im Bereich der Berührstellen mit dem Deckel eine schalldämpfende Auflage besitzen.So that there is sufficient sound absorption during operation of the internal combustion engine, the spring body should have a sound-absorbing pad at least in the area of contact with the cover.

Die Erfindung ist anhand eines Ausführungsbeispieles in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigt:

Figur 1:
Ausschnitt eines erfindungsgemäßen Gehäusedeckels.
The invention is illustrated in the drawing using an exemplary embodiment and is explained in more detail below. It shows:
Figure 1:
Section of a housing cover according to the invention.

Die Figur 1 zeigt einen Gehäusedeckel (1) in Form eines Ventildeckels für Brennkraftmaschinen. Der Gehäusedeckel (1) besteht aus Aluminium. Zur Abdichtung des Zylinderkopfes (2) ist am Deckelrand (3) eine Elastomerdichtung (4) angeordnet. Um die Dichtung (4) mit definierter Vorspannung auf die Dichtfläche des Zylinderkopfes (2) pressen zu können, sind, über den Umfang verteilt, mehrere Löcher (5) angeordnet, durch die sich Stehbolzen (6) erstrecken. Zur Abdichtung der Stehbolzen dienen Gummihülsen (7), die mit dem Deckel (1) verbunden sind. Die Gummihülsen (7) können einvulkanisiert oder eingepreßt sein. Ein aus Stahlband gefertigter Federkörper (8) ist formschlüssig mit der Gummihülse (7) verbunden. Der Federkörper (8) stützt sich auf der Metallfläche (9) des Deckels (1) ab. Beim Anziehen der Mutter (10) des Stehbolzens (6) wird der Federkörper (8) axial verpreßt und erzeugt somit eine Vorspannkraft an die Dichtung (4). Da der Federkörper (8) aus Metall gebildet ist, bleibt die Anpreßkraft über einen langen Zeitraum und über ein breites Temperaturspektrum weitgehend konstant. Im Gegensatz zur Gummihülse (7) tritt keine Alterung auf. Darüberhinaus kann dieser Federkörper (8) ein Fließen/Setzen der Dichtung (4) ausgleichen. Zur Schalldämpfung kann aufder Unterseite des Federkörpers (8) eine dünne schalldämpfende Schicht (11) aufgetragen sein.FIG. 1 shows a housing cover (1) in the form of a valve cover for internal combustion engines. The housing cover (1) is made of aluminum. To seal the cylinder head (2), an elastomer seal (4) is arranged on the edge of the cover (3). In order to be able to press the seal (4) onto the sealing surface of the cylinder head (2) with a defined prestress, several holes (5) are arranged around the circumference, through which stud bolts (6) extend. Rubber sleeves (7), which are attached to the cover (1), are used to seal the stud bolts. are connected. The rubber sleeves (7) can be vulcanized in or pressed in. A spring body (8) made of steel strip is positively connected to the rubber sleeve (7). The spring body (8) is supported on the metal surface (9) of the cover (1). When the nut (10) of the stud bolt (6) is tightened, the spring body (8) is pressed axially and thus generates a pretensioning force on the seal (4). Since the spring body (8) is made of metal, the contact pressure remains largely constant over a long period and over a wide temperature range. In contrast to the rubber sleeve (7), no aging occurs. In addition, this spring body (8) can compensate for a flow / setting of the seal (4). A thin sound-absorbing layer (11) can be applied to the underside of the spring body (8) for sound absorption.

Claims (7)

Gehäusedeckel, insbesondere Ölwanne oder Ventildeckel, zum lösbaren, flüssigkeitsdichten Befestigen am Motorblock von Brennkraftmaschinen, wobei der Deckel mit Gummihülsen versehene Löcher für Befestigungsschrauben aufweist, um auf einer am Rand des Deckels verlaufenden elastomeren Dichtung eine hinreichende Vorspannkraft zu erzeugen, dadurch gekennzeichnet, daß zur Einstellung der Vorspannkraft ein metallischer Federkörper (8) vorgesehen ist.Housing cover, in particular oil pan or valve cover, for releasable, liquid-tight fastening to the engine block of internal combustion engines, the cover having holes for fastening screws provided with rubber sleeves in order to produce a sufficient pretensioning force on an elastomeric seal running on the edge of the cover, characterized in that for adjustment a metallic spring body (8) is provided for the prestressing force. Gehäusedeckel nach Anspruch 1, dadurch gekennzeichnet, daß der Federkörper (8) sich auf der Metallfläche (9) des Deckels (1) abstützt.Housing cover according to claim 1, characterized in that the spring body (8) is supported on the metal surface (9) of the cover (1). Gehäusedeckel nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Befestigungsschrauben (10) sich auf dem Federkörper (8) axial abstützen.Housing cover according to claims 1 and 2, characterized in that the fastening screws (10) are supported axially on the spring body (8). Gehäusedeckel nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die Gummihülsen (7) mit dem Federkörper (8) verbunden sind.Housing cover according to claims 1 to 3, characterized in that the rubber sleeves (7) are connected to the spring body (8). Gehäusedeckel nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß der Federkörper (8) aus Stahl gebildet ist.Housing cover according to claims 1 to 4, characterized in that the spring body (8) is formed from steel. Gehäusedeckel nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß der Federkörper (8) als Blattfeder ausgebildet ist.Housing cover according to claims 1 to 5, characterized in that the spring body (8) is designed as a leaf spring. Gehäusedeckel nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß der Federkörper (8) mindestens im Bereich der Berührstellen (9) und dem Deckel (1) eine schalldämpfende Auflage (11) besitzt.Housing cover according to claims 1 to 5, characterized in that the spring body (8) has a sound-absorbing pad (11) at least in the area of the contact points (9) and the cover (1).
EP95100584A 1994-01-21 1995-01-18 Rocker cover Expired - Lifetime EP0664388B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4401486 1994-01-21
DE4401486A DE4401486C2 (en) 1994-01-21 1994-01-21 Housing cover

Publications (2)

Publication Number Publication Date
EP0664388A1 true EP0664388A1 (en) 1995-07-26
EP0664388B1 EP0664388B1 (en) 1998-04-01

Family

ID=6508251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95100584A Expired - Lifetime EP0664388B1 (en) 1994-01-21 1995-01-18 Rocker cover

Country Status (3)

Country Link
EP (1) EP0664388B1 (en)
DE (2) DE4401486C2 (en)
ES (1) ES2114234T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288476A2 (en) 2001-08-24 2003-03-05 Federal-Mogul Sealing Systems Bretten GmbH & Co. KG Cover with an acoustically isolated abutment
EP1288475A2 (en) 2001-08-24 2003-03-05 Federal-Mogul Sealing Systems Bretten GmbH & Co. KG Cover with a device for securing the sealing forces

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29612020U1 (en) * 1996-07-10 1996-10-02 Kunststofftechnik F.u.H. Riesselmann GmbH, 01458 Ottendorf-Okrilla Thermoplastic plastic component, in particular cylinder head cover for engines
DE202008004036U1 (en) * 2008-03-20 2009-08-06 Mann+Hummel Gmbh Oil pan for an internal combustion engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115268A (en) * 1962-08-10 1963-12-24 Genova Andrew De Valve tappet cover hold-down
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
EP0268200A2 (en) * 1986-11-15 1988-05-25 Karl Joh Gummiwarenfabrik GmbH Valve cover for the cylinder head of an internal-combustion engine
EP0547306A1 (en) * 1991-12-17 1993-06-23 CR Elastomere GmbH Cover for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115268A (en) * 1962-08-10 1963-12-24 Genova Andrew De Valve tappet cover hold-down
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
EP0268200A2 (en) * 1986-11-15 1988-05-25 Karl Joh Gummiwarenfabrik GmbH Valve cover for the cylinder head of an internal-combustion engine
EP0547306A1 (en) * 1991-12-17 1993-06-23 CR Elastomere GmbH Cover for internal combustion engines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288476A2 (en) 2001-08-24 2003-03-05 Federal-Mogul Sealing Systems Bretten GmbH & Co. KG Cover with an acoustically isolated abutment
EP1288475A2 (en) 2001-08-24 2003-03-05 Federal-Mogul Sealing Systems Bretten GmbH & Co. KG Cover with a device for securing the sealing forces
US6691667B2 (en) 2001-08-24 2004-02-17 Federal-Mogul Sealing Systems Bretten Gmbh & Co. Kg Casing cover having an acoustically decoupled stop
DE10141570B4 (en) * 2001-08-24 2004-09-02 Federal-Mogul Sealing Systems Bretten Gmbh & Co. Kg Housing cover with device for securing the sealing forces
DE10141569B4 (en) * 2001-08-24 2004-09-02 Federal-Mogul Sealing Systems Bretten Gmbh & Co. Kg Housing cover with acoustically decoupled stop
US6863039B2 (en) 2001-08-24 2005-03-08 Federal-Mogul Sealing Systems Bretten Gmbh & Co. Kg Casing cover having a device for assuring sealing forces

Also Published As

Publication number Publication date
DE4401486A1 (en) 1995-07-27
DE4401486C2 (en) 1997-09-04
DE59501735D1 (en) 1998-05-07
ES2114234T3 (en) 1998-05-16
EP0664388B1 (en) 1998-04-01

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