EP0228533A2 - Internal-combustion engine with at least one overhead camshaft - Google Patents

Internal-combustion engine with at least one overhead camshaft Download PDF

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Publication number
EP0228533A2
EP0228533A2 EP86115234A EP86115234A EP0228533A2 EP 0228533 A2 EP0228533 A2 EP 0228533A2 EP 86115234 A EP86115234 A EP 86115234A EP 86115234 A EP86115234 A EP 86115234A EP 0228533 A2 EP0228533 A2 EP 0228533A2
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EP
European Patent Office
Prior art keywords
cylinder head
screw
camshaft
bearing
cylinder
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
EP86115234A
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German (de)
French (fr)
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EP0228533B1 (en
EP0228533A3 (en
Inventor
Max Ruf
Erwin Korostenski
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Audi AG
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Audi AG
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Publication of EP0228533A2 publication Critical patent/EP0228533A2/en
Publication of EP0228533A3 publication Critical patent/EP0228533A3/en
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Publication of EP0228533B1 publication Critical patent/EP0228533B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • 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

Definitions

  • the invention relates to an internal combustion engine according to the preamble of claim 1.
  • a hole is provided in the known design at the points where the optimal position for the cylinder head screws is, which extends through the bearing cover and across the camshaft and opens into a larger diameter hole in the cylinder head . This makes it possible to pre-assemble the cylinder head and the camshaft (s) and screw this unit to the cylinder block.
  • the main disadvantage here is that the fastening screw mentioned is located at a relatively large distance from the camshaft and the bearing cap is also weakened by the through-hole in the area between this screw and the camshaft, so that deformations of the bearing cap due to the action on the camshaft, cannot be excluded from the valve springs and the forces arising from the masses to be accelerated and force the bearing cover to be correspondingly stiff and heavy.
  • the invention has for its object to provide an internal combustion engine according to the preamble of claim 1, in which with simple means an attachment of the cylinder head and camshaft (s) unit is possible on the cylinder block without adversely affecting the camshaft bearing in any way becomes.
  • the unit consisting of the cylinder head and camshaft (s) can be screwed onto the cylinder block as in the prior art, but without having to provide a bore penetrating the bearing cover and the camshaft with the disadvantages described above.
  • the bearing cover can be screwed to the cylinder head in an optimal manner in the immediate vicinity of the camshaft.
  • Cylinder heads are usually made of light metal, which has only a relatively low permissible specific surface pressure. Since the diameter of the axial through bore of the bearing cap screw and thus also the diameter of the head or collar of the cylinder head screw can only be relatively small, it is expedient to screw a threaded sleeve made of steel into the bore of the cylinder head receiving the cylinder head screw, on the end face of which the head or collar the cylinder head screw rests. This distributes the tightening force of the screw over the threads of the sleeve.
  • the cylinder head 1 shown in partial section in FIG. 1 carries a camshaft 2 which is fastened to the cylinder head 1 by bearing shells 3.
  • the bearing surface is formed by two half-shells, of which one half-shell 4 is provided in the cylinder head 1 and the second half-shell 5 in the bearing cover 3.
  • the bearing cover 3 shown in the drawing is attached to the cylinder head 1 on the one hand by a screw 6 which engages in a threaded bore 7 in the cylinder head 1, and on the other hand by a banjo bolt 8 which engages in an internal thread 9 of a through bore 10 in the cylinder head 1.
  • a bore 11 is provided in the cylinder head 1, which serves to receive a cylinder head screw 12, which engages in a threaded bore 13 in the cylinder block 14 and serves to fasten the cylinder head 1 to the cylinder block 14.
  • the inside diameter of the through bore 15 of the hollow screw 8 is dimensioned such that the cylinder head screw 12 can be passed through, so that the cylinder head 1 can be preassembled with the camshaft 2 and this unit can be screwed onto the cylinder block 14 by means of the screws 12.
  • the cylinder head 1 consists in the usual way of a light metal alloy, which allows only a relatively low specific surface pressure. Since the diameter of the through bore 15 of the hollow screw 8 and thus also the diameter of the collar 12a of the cylinder head screw 12 designed as a polygonal collar screw can only be relatively small, excessive surface pressure on the contact surface on the cylinder head 1 would arise when the cylinder head screw 12 was tightened. To avoid this, the bore 11 is provided with an internal thread 18, into which a threaded sleeve 17 made of steel is screwed, on the end face of which the collar 12a of the cylinder head screw 12 is supported. As a result, the tightening force of the screw is distributed over the threads of the threaded sleeve 17, so that the area absorbing this force is increased and the specific surface pressure is reduced.
  • the cylinder head screw 12 is designed as a polygonal collar screw. However, it can also be designed as a differential screw with two threaded sections of different pitch, which cooperate with corresponding internal threads in the cylinder block 14 and in the cylinder head 1, with the different pitches tightening the cylinder head and the cylinder block. Since such a differential screw has no head or collar, the diameter of the through hole 15 and thus the outer diameter of the head of the hollow screw 8 can be kept smaller.
  • the illustrated mounting of the bearing shell 3 by means of a banjo bolt 8 is naturally only necessary where it is desirable to attach the cylinder head 1 to be attached to a position above a camshaft bearing on the cylinder block 14. If the cylinder head screwing is possible at other points, the bearing cover 3 is fastened to the cylinder head 1 in the usual way on both sides with normal screws 6. This can be the case, for example, if two camshafts are provided and the screw connection of the cylinder head 1 to the cylinder block 14 only has to be provided on one side in the area of the bearing shells of the one camshaft, while on the other side the cylinder head screw connection is outside the area of the bearing shells the second camshaft can be provided.
  • the fastening screws 6 and 8 of the bearing shell 3 are provided as close as possible to the camshaft 2 in order to avoid deformations of the bearing shell 3 due to the force acting on the camshaft.
  • the head of the hollow screw 8 is not designed for this purpose as a conventional hexagon, but only provided with radial incisions 16 for engaging the tool, so that the hollow screw 8 can be moved as close as possible to the camshaft 2.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

1. Internal combustion engine having a cylinder block (14), a cylinder head (1) secured to the cylinder block by bolts (12) and at least one overhead camshaft (2), running in bearings consisting of two bearing shells (4, 5), of which one bearing shell (4) is located in the cylinder head (1) and the other bearing shell (5) is located in a bearing cap (3) which is secured to the cylinder head (1) by bolts (6, 8), is such a way that these bearing cap bolts (6, 8) are positioned in the immediate vicinity of the camshaft (2), characterised in that at least one (8) of these bearing cap bolts and at least one cylinder head bolt (12) are in direct axial alignment and that this bearing cap bolt (8) is provided with an axial drilling (15) through which the cylinder head bolt (12) can be inserted.

Description

Die Erfindung bezieht sich auf eine Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an internal combustion engine according to the preamble of claim 1.

Eine Brennkraftmaschine dieser Art ist in der US-PS 4 430 968 beschrieben. Wie in dieser Patent­schrift ausgeführt, muß bei derartigen Brennkraft­maschinen häufig ein Kompromiss zwischen der Lager der Nockenwelle(n) bzw. der Befestigungsstellen ihrer Lager­deckel und der Lage der zur Befestigung des Zylinder­kopfes am Zylinderblock dienenden Schrauben getroffen werden, da diese Lagen oftmals übereinstimmen, so daß es nicht möglich ist, den Zylinderkopf zusammen mit der Nockenwelle bzw. den Nockenwellen vorzumontieren und diese Einheit dann auf den Zylinderkopf aufzu­schrauben. Vielmehr muß zuerst der Zylinderkopf auf den Zylinderblock aufgeschraubt und dann die Nocken­welle auf den Zylinderkopf montiert werden. Ein Nach­ziehen der Zylinderkopfschrauben ist dabei erst nach Demontage der Nockenwelle(n) möglich. Um diesen Nach­teil zu vermeiden, ist bei der bekannten Ausführung an den Stellen, an denen sich die optimale Lage für die Zylinderkopfschrauben befinden, eine Bohrung vor­gesehen, die sich durch den Lagerdeckel und quer durch die Nockenwelle erstreckt und in eine Bohrung größeren Durchmessers im Zylinderkopf mündet. Dadurch ist es möglich, den Zylinderkopf und die Nockenwelle(n) vor­zumontieren und diese Einheit mit dem Zylinderblock zu verschrauben. Allerdings wird diese Möglichkeit mit einem erheblichen Aufwand erkauft, da sonst nicht erforderliche Bohrungen im Lagerdeckel und in der Nockenwelle vorgesehen werden müssen, die Bohrung im Lagerdeckel durch ein eigenes Bauteil abgeschlossen werden muß und die Verschraubung des Zylinderkopfes mit dem Zylinderblock mittels einer Mutter erfolgen muß, die vor der Montage der Nockenwelle in die Bohrung größeren Durchmessers im Zylinderkopf eingelegt wurde, da der Durchmesser der Nockenwelle nicht ausreicht, um eine so große Querbohrung vorzusehen, daß der Schrauben­kopf oder eine Mutter hindurchgeführt werden kann. Nach­teilig ist bei dieser bekannten Ausführung auch, daß ein sehr hoher Aufwand für eine ausreichende Schmierung der Nockenwellenlager erforderlich ist, da durch die ge­nannte, die Lagerfläche durchsetzende Bohrung die tragende Fläche des Lagers verringert wird und über­dies die Bildung eines Schmierölkeils in Frage ge­stellt ist.An internal combustion engine of this type is described in US Pat. No. 4,430,968. As stated in this patent specification, such internal combustion engines often have to make a compromise between the bearings of the camshaft (s) or the fastening points of their bearing caps and the position of the screws used to fasten the cylinder head to the cylinder block, since these positions often coincide so that it is not possible to pre-assemble the cylinder head together with the camshaft or camshafts and then screw this unit onto the cylinder head. Rather, the cylinder head must first be screwed onto the cylinder block and then the camshaft must be mounted on the cylinder head. Tightening the cylinder head screws is only possible after removing the camshaft (s). To avoid this disadvantage, a hole is provided in the known design at the points where the optimal position for the cylinder head screws is, which extends through the bearing cover and across the camshaft and opens into a larger diameter hole in the cylinder head . This makes it possible to pre-assemble the cylinder head and the camshaft (s) and screw this unit to the cylinder block. However, this option is purchased with considerable effort, since otherwise unnecessary holes in the bearing cap and in the camshaft must be provided, the hole in the bearing cap is completed by a separate component and the cylinder head must be screwed to the cylinder block by means of a nut that was inserted into the larger diameter bore in the cylinder head before the camshaft was installed, since the diameter of the camshaft is not sufficient to provide such a large transverse bore that the screw head or a mother can be passed through. It is also disadvantageous in this known embodiment that a very high outlay is required for adequate lubrication of the camshaft bearings, since the bearing surface passing through the bearing surface reduces the bearing surface of the bearing and, moreover, the formation of a lubricating oil wedge is questioned.

Eine andere Möglichkeit, eine vormontierte Einheit aus Zylinderkopf und Nockenwelle(n) auf den Zylinderblock aufzuschrauben, ist aus der EP-PS 0 098 180 bekannt. Hierbei ist der Lagerdeckel der Nockenwellenlager mit einer Öffnung versehen, die zwischen der Nocken­welle und einer Befestigungsschraube des Lagerdeckels am Zylinderkopf angeordnet ist und für den Durchgang einer Kopfschraube bestimmt ist, mit welcher der Zylinder­kopf am Zylinderblock befestigt wird. Nachteilig ist hierbei vor allem, daß sich die genannte Befestigungs­schraube in einem relativ großen Abstand von der Nockenwelle befindet und der Lagerdeckel überdies durch die Durchgangsbohrung im Bereich zwischen diese54 Schraube und der Nockenwelle geschwächt ist, so daß verformungen des Lagerdeckels durch die auf die Nocken­welle wirkenden, von den Ventilfedern und den zu be­schleunigenden Massen herrührenden Kräfte nicht aus­geschlossen werden können und zu einer entsprechend steifen und schweren Ausbildung des Lagerdeckels zwingen.Another possibility of screwing a preassembled unit consisting of cylinder head and camshaft (s) onto the cylinder block is known from EP-PS 0 098 180. Here, the bearing cover of the camshaft bearing is provided with an opening which is arranged between the camshaft and a fastening screw of the bearing cover on the cylinder head and is intended for the passage of a cap screw with which the cylinder head is fastened to the cylinder block. The main disadvantage here is that the fastening screw mentioned is located at a relatively large distance from the camshaft and the bearing cap is also weakened by the through-hole in the area between this screw and the camshaft, so that deformations of the bearing cap due to the action on the camshaft, cannot be excluded from the valve springs and the forces arising from the masses to be accelerated and force the bearing cover to be correspondingly stiff and heavy.

Der Erfindung liegt die Aufgabe zugrunde, eine Brenn­kraftmaschine gemäß dem oberbegriff des Patentan­spruchs 1 zu schaffen, bei der mit einfachen Mitteln eine Befestigung der aus Zylinderkopf und Nocken­welle(n) bestehenden Einheit am Zylinderblock mög­lich ist, ohne daß die Nockenwellenlagerung in irgend einer Weise nachteilig beeinflußt wird.The invention has for its object to provide an internal combustion engine according to the preamble of claim 1, in which with simple means an attachment of the cylinder head and camshaft (s) unit is possible on the cylinder block without adversely affecting the camshaft bearing in any way becomes.

Diese Aufgabe wird erfindungsgemäß durch die im Kenn­zeichen des Patentanspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of patent claim 1.

Bei dem erfindungsgemäßen Vorschlag kann die aus Zylinderkopf und Nockenwelle(n) bestehende Einheit wie beim Stand der Technik auf den Zylinderblock auf­geschraubt werden, ohne jedoch eine den Lagerdeckel und die Nockenwelle durchsetzende Bohrung mit ihren vorher beschriebenen Nachteilen vorsehen zu müssen. Die Verschraubung des Lagerdeckels am Zylinderkopf kann in optimaler Weise in unmittelbarer Nähe der Nockenwele erfolgen.In the proposal according to the invention, the unit consisting of the cylinder head and camshaft (s) can be screwed onto the cylinder block as in the prior art, but without having to provide a bore penetrating the bearing cover and the camshaft with the disadvantages described above. The bearing cover can be screwed to the cylinder head in an optimal manner in the immediate vicinity of the camshaft.

Zylinderköpfe bestehen normalerweise aus Leichtmetall, das nur eine verhältnismäßig geringe zulässuige spezifische Flächenpressung hat. Da der Durchmesser der axialen Durchgangsbohrung der Lagerdeckelschraube und damit auch der Durchmesser des Kopfes oder Bundes der Zylinderkopfschraube nur verhältnismäßig klein sein kann, ist es zweckmäßig, in die die Zylinderkopf­schraube aufnehmende Bohrung des Zylinderkopfes eine Gewindehülse aus Stahl einzuschrauben, an deren Stirn­fläche der Kopf oder Bund der Zylinderkopfschraube auf­liegt. Dadurch wird die Anzugskraft der Schraube auf die Gewindegänge der Hülse verteilt.Cylinder heads are usually made of light metal, which has only a relatively low permissible specific surface pressure. Since the diameter of the axial through bore of the bearing cap screw and thus also the diameter of the head or collar of the cylinder head screw can only be relatively small, it is expedient to screw a threaded sleeve made of steel into the bore of the cylinder head receiving the cylinder head screw, on the end face of which the head or collar the cylinder head screw rests. This distributes the tightening force of the screw over the threads of the sleeve.

Ein Ausführungsbeispiel der Erfindung wird im folenden unter Bezugnahme auf die Zeichnung beschrieben. Es zeigt:

  • Fig. 1 einen Teilschnitt eines auf einen Zylinder­block aufgeschraubten Zylinderkopfes mit montierter Nockenwelle, und
  • Fig. 2 eine Draufsicht in Richtung des Pfeiles II in Fig. 1.
An embodiment of the invention is described below with reference to the drawing. It shows:
  • Fig. 1 is a partial section of a screwed onto a cylinder block cylinder head with an assembled camshaft, and
  • 2 is a plan view in the direction of arrow II in FIG. 1st

Der in Fig. 1 im Teilschnitt dargestellte Zylinder­kopf 1 trägt eine Nockenwelle 2, die durch Lager­schalen 3 am Zylinderkopf 1 befestigt ist. Die Lager­fläche wird von zwei Halbschalen gebildet, von denen die eine Halbschale 4 im Zylinderkopf 1 und die zweite Halbschale 5 im Lagerdeckel 3 vorgesehen ist. Der in der Zeichnung dargestellte Lagerdeckel 3 ist am Zylinderkopf 1 einerseits durch eine Schraube 6 befestigt, die in eine Gewindebohrung 7 im Zylinder­kopf 1 eingreift, und andererseits durch eine Hohl­schraube 8, die in ein Innengewinde 9 einer Durch­gangsbohrung 10 im Zylinderkopf 1 eingreift. Mit der Bohrung 10 fluchtend ist im Zylinderkopf 1 eine Bohrung 11 vorgesehen, die zur Aufnahme einer Zylinderkopfschraube 12 dient, welche in eine Gewinde­bohrung 13 im Zylinderblock 14 eingreift und zur Be­festigung des Zylinderkopfes 1am Zylinderblock 14 dient. Der Innendurchmesser der Durchgangsbohrung 15 der Hohlschraube 8 ist so bemessen, daß die Zylinder­kopfschraube 12 hindurchgeführt werden kann, so daß der Zylinderkopf 1 mit der Nockenwelle 2 vormontiert und diese Einhgeit mittels der Schrauben 12 an den Zylinderblock 14 angeschraubt werden kann.The cylinder head 1 shown in partial section in FIG. 1 carries a camshaft 2 which is fastened to the cylinder head 1 by bearing shells 3. The bearing surface is formed by two half-shells, of which one half-shell 4 is provided in the cylinder head 1 and the second half-shell 5 in the bearing cover 3. The bearing cover 3 shown in the drawing is attached to the cylinder head 1 on the one hand by a screw 6 which engages in a threaded bore 7 in the cylinder head 1, and on the other hand by a banjo bolt 8 which engages in an internal thread 9 of a through bore 10 in the cylinder head 1. Aligned with the bore 10, a bore 11 is provided in the cylinder head 1, which serves to receive a cylinder head screw 12, which engages in a threaded bore 13 in the cylinder block 14 and serves to fasten the cylinder head 1 to the cylinder block 14. The inside diameter of the through bore 15 of the hollow screw 8 is dimensioned such that the cylinder head screw 12 can be passed through, so that the cylinder head 1 can be preassembled with the camshaft 2 and this unit can be screwed onto the cylinder block 14 by means of the screws 12.

Der Zylinderkopf 1 besteht in üblicher Weise aus einer Leichtmetall-Legierung, die nur eine relativ geringe spezifische Flächenpressung zuläßt. Da der Durchmesser der Durchgangsbohrung 15 der Hohlschraube 8 und damit auch der Durchmesser des Bundes 12a der als Mehrkant-­Bundschraube ausgebildeten Zylinderkopfschraube 12 nur verhältnismäßig klein sein kann, würde beim Anziehen der Zylinderkopfschraube 12 eine übermäßige Flächenpressung an der Auflagefläche am Zylinderkopf 1 entstehen. Um dies zu vermeiden, ist die bohrung 11 mit einem Innengewinde 18 versehen, in welche eine Gewindehülse 17 aus Stahl einge­schraube ist, auf deren Stirnfläche sich der Bund 12a der Zylinderkopfschraube 12 abstützt. Dadurch wird die Anzugskraft der Schraube auf die Gewindegänge der Ge­windehülse 17 verteilt, so daß die diese Kraft auf­nehmende Fläche vergrößert und die spezifische Flächen­pressung verringert wird.The cylinder head 1 consists in the usual way of a light metal alloy, which allows only a relatively low specific surface pressure. Since the diameter of the through bore 15 of the hollow screw 8 and thus also the diameter of the collar 12a of the cylinder head screw 12 designed as a polygonal collar screw can only be relatively small, excessive surface pressure on the contact surface on the cylinder head 1 would arise when the cylinder head screw 12 was tightened. To avoid this, the bore 11 is provided with an internal thread 18, into which a threaded sleeve 17 made of steel is screwed, on the end face of which the collar 12a of the cylinder head screw 12 is supported. As a result, the tightening force of the screw is distributed over the threads of the threaded sleeve 17, so that the area absorbing this force is increased and the specific surface pressure is reduced.

Die Zylinderkopfschraube 12 ist im Ausführungsbeispiel als Mehrkant-Bundschraube ausgebildet. Sie kann jedoch auch als Differentialschraube mit zwei Gewindeab­schnitten unterschiedlicher Steigung ausgebildet sein, die mit entsprechenden Innengewinden im Zylinderblock 14 und im Zylinderkopf 1 zusammenwirken, wobei durch die unterschiedlichen Steigungen ein Zusammenspannen von Zylinderkopf und Zylinderblock erfolgt. Da eine solche Differentialschraube keinen Kopf oder Bund hat, kann der Durchmesser der Durchgangsbohrung 15 und damit der Außendurchmesser des Kopfes der Hohlschraube 8 kleiner gehalten werden.In the exemplary embodiment, the cylinder head screw 12 is designed as a polygonal collar screw. However, it can also be designed as a differential screw with two threaded sections of different pitch, which cooperate with corresponding internal threads in the cylinder block 14 and in the cylinder head 1, with the different pitches tightening the cylinder head and the cylinder block. Since such a differential screw has no head or collar, the diameter of the through hole 15 and thus the outer diameter of the head of the hollow screw 8 can be kept smaller.

Die dargestellte Befestigung der Lagerschale 3 mittels einer Hohlschraube 8 ist naturgemäß nur dort erforder­lich, wo es wünschenswert ist, den Zylinderkopf 1 an einer oberhalb eines Nockenwellenlagers liegenden Stelle am Zylinderblock 14 zu befestigen. Wenn die Zylinderkopfverschraubung an anderen Stellen möglich ist, so wird der Lagerdeckel 3 in üblicher Weise beidseitig mit normalen Schrauben 6 am Zylinderkopf 1 befestigt. Dies kann beispielsweise dann der Fall sein, wenn zwei Nockenwellen vorgesehen sind und die Verschraubung des Zylinderkopfes 1 mit dem Zylinder­block 14 nur auf einer Seite im Bereich der Lager­schalen der einen Nockenwelle vorgesehen werden muß, während auf der anderen Seite die Zylinderkopfver­schraubung außerhalb des Bereichs der Lagerschalen der zweiten Nockenwelle vorgesehen werden kann.The illustrated mounting of the bearing shell 3 by means of a banjo bolt 8 is naturally only necessary where it is desirable to attach the cylinder head 1 to be attached to a position above a camshaft bearing on the cylinder block 14. If the cylinder head screwing is possible at other points, the bearing cover 3 is fastened to the cylinder head 1 in the usual way on both sides with normal screws 6. This can be the case, for example, if two camshafts are provided and the screw connection of the cylinder head 1 to the cylinder block 14 only has to be provided on one side in the area of the bearing shells of the one camshaft, while on the other side the cylinder head screw connection is outside the area of the bearing shells the second camshaft can be provided.

Die Befestigungschrauben 6 und 8 der Lagerschale 3 sind, wie ersichtlich, möglichst nahe der Nocken­welle 2 vorgesehen, um Verformungen der Lagerschale 3 durch die auf die Nockenwelle wirkenden Kraft zu ver­meiden. Der Kopf der Hohlschraube 8 ist zu diesem Zweck nicht als üblicher Sechskant ausgeführt, sondern lediglich mit radialen Einschnitten 16 zum Angriff des Werkzeuges versehen, so daß die Hohlschraube 8 möglichst nahe an die Nocken­welle 2 herangerückt werden kann.As can be seen, the fastening screws 6 and 8 of the bearing shell 3 are provided as close as possible to the camshaft 2 in order to avoid deformations of the bearing shell 3 due to the force acting on the camshaft. The head of the hollow screw 8 is not designed for this purpose as a conventional hexagon, but only provided with radial incisions 16 for engaging the tool, so that the hollow screw 8 can be moved as close as possible to the camshaft 2.

Claims (2)

1. Brennkraftmaschine mit einem Zylinderblock (14), einem an diesem durch Schrauben (12) befestigten Zylinderkopf (1) und mindestens einer obenliegenden Nockenwelle (2), die in Lagern gelagert ist, welche jeweils aus zwei Halbschalen (4, 5) bestehen, von denen die eine Halbschale (4) in dem Zylinderkopf (1) und die andere Halbschale (5) in einem am Zylinder­kopf (1) durch Schrauben (6, 8) befestigten Lager­deckel (3) vorgesehen ist,
dadurch gekennzeichnet,
daß mindestens eine Lagerdeckelschraube (8) und mindestens eine Zylinderkopfschraube (12) mitein­ander fluchtend angeordnet sind und die Lagerdeckel­schraube (8) eine axiale Durchgangsbohrung (15) auf­weist, durch welche die Zylinderkopfschraube (12) hindurchführbar ist.1. Internal combustion engine with a cylinder block (14), a cylinder head (1) fastened to it by screws (12) and at least one overhead camshaft (2) which is mounted in bearings which each consist of two half-shells (4, 5), of which one half shell (4) is provided in the cylinder head (1) and the other half shell (5) is provided in a bearing cover (3) fastened to the cylinder head (1) by screws (6, 8),
characterized,
that at least one bearing cap screw (8) and at least one cylinder head screw (12) are arranged in alignment with one another and the bearing cover screw (8) has an axial through-bore (15) through which the cylinder head screw (12) can be passed. 2. Brennkraftmaschine nach Anspruch 1, bei der der Zylinderkopf aus Leichtmetall besteht, dadurch gekennzeichnet, daß die Auflagefläche der Zylinder­kopfschraube (12) am Zylinderkopf (1) von der Stirn­fläche ainer Gewindehülse (17) aus Stahl gebildet ist, die in ein Gewinde (18) in der die Zylinder­kopfschraube (12) aufnehmenden Bohrung (11) einge­schraubt ist.2. Internal combustion engine according to claim 1, in which the cylinder head consists of light metal, characterized in that the bearing surface of the cylinder head screw (12) on the cylinder head (1) from the end face of a threaded sleeve (17) is formed from steel, which in a thread (18 ) is screwed into the bore (11) receiving the cylinder head screw (12).
EP86115234A 1985-11-26 1986-11-04 Internal-combustion engine with at least one overhead camshaft Expired EP0228533B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3541700 1985-11-26
DE19853541700 DE3541700A1 (en) 1985-11-26 1985-11-26 INTERNAL COMBUSTION ENGINE WITH AT LEAST ONE OVERHEAD CAMSHAFT

Publications (3)

Publication Number Publication Date
EP0228533A2 true EP0228533A2 (en) 1987-07-15
EP0228533A3 EP0228533A3 (en) 1988-02-24
EP0228533B1 EP0228533B1 (en) 1989-01-11

Family

ID=6286834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115234A Expired EP0228533B1 (en) 1985-11-26 1986-11-04 Internal-combustion engine with at least one overhead camshaft

Country Status (3)

Country Link
EP (1) EP0228533B1 (en)
JP (1) JPS62131953A (en)
DE (2) DE3541700A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0246484A2 (en) * 1986-05-16 1987-11-25 Audi Ag Screwed connection for the cylinder head of a combustion engine
FR2669677A1 (en) * 1990-11-28 1992-05-29 Peugeot Internal combustion engine cylinder head for valve control using rocker lever and tappet
WO1999066176A1 (en) * 1998-06-12 1999-12-23 Volkswagen Aktiengesellschaft Cylinder head for internal combustion engines and method for producing same
EP2341221A1 (en) * 2009-12-23 2011-07-06 Amadeo Marti Carbonell S.A. Device for mounting the cylinder head of an engine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4416627A1 (en) * 1994-05-11 1995-11-16 Audi Ag IC engine with cylinder block
DE102006034225A1 (en) * 2006-07-25 2008-02-07 GM Global Technology Operations, Inc., Detroit Internal combustion engine cylinder, has bucket tappet with valve clearance compensation that is movable in passage of cylinder, where tappet acts together with cam to convert rotation of cam shaft into opening and closing movement of valve
DE102010051367A1 (en) * 2010-11-13 2012-05-16 Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) Internal combustion engine with overhead camshafts
CN106089474B (en) * 2016-06-13 2018-10-12 宁波市鄞州德来特技术有限公司 A kind of cylinder of gasoline engine and the assembly method for installing cylinder head
DE102017118862A1 (en) * 2017-08-18 2019-02-21 Man Truck & Bus Ag Device for rotatably supporting a camshaft

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098180A1 (en) * 1982-06-14 1984-01-11 Automobiles Peugeot Bearing cap for an overhead cam shaft of an internal-combustion engine, and such an engine
US4430968A (en) * 1981-03-31 1984-02-14 Yamaha Hatsudoki Kabushiki Kaisha Cylinder head fastening structure for internal combustion engines
JPS59180017A (en) * 1983-03-31 1984-10-12 Yamaha Motor Co Ltd Cam bearing structure of overhead valve type internal-combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4430968A (en) * 1981-03-31 1984-02-14 Yamaha Hatsudoki Kabushiki Kaisha Cylinder head fastening structure for internal combustion engines
EP0098180A1 (en) * 1982-06-14 1984-01-11 Automobiles Peugeot Bearing cap for an overhead cam shaft of an internal-combustion engine, and such an engine
JPS59180017A (en) * 1983-03-31 1984-10-12 Yamaha Motor Co Ltd Cam bearing structure of overhead valve type internal-combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 38 (M-358) [1761], 19. Februar 1985; & JP-A-59 180 017 (YAMAHA HATSUDOKI K.K.) 12-10-1984 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0246484A2 (en) * 1986-05-16 1987-11-25 Audi Ag Screwed connection for the cylinder head of a combustion engine
EP0246484B1 (en) * 1986-05-16 1990-08-16 Audi Ag Screwed connection for the cylinder head of a combustion engine
FR2669677A1 (en) * 1990-11-28 1992-05-29 Peugeot Internal combustion engine cylinder head for valve control using rocker lever and tappet
WO1999066176A1 (en) * 1998-06-12 1999-12-23 Volkswagen Aktiengesellschaft Cylinder head for internal combustion engines and method for producing same
CN1088146C (en) * 1998-06-12 2002-07-24 大众汽车有限公司 Cylinder head for internal combustion engines and method for producing same
EP2341221A1 (en) * 2009-12-23 2011-07-06 Amadeo Marti Carbonell S.A. Device for mounting the cylinder head of an engine

Also Published As

Publication number Publication date
DE3661753D1 (en) 1989-02-16
JPS62131953A (en) 1987-06-15
EP0228533B1 (en) 1989-01-11
DE3541700A1 (en) 1987-05-27
EP0228533A3 (en) 1988-02-24

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