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EP0098180B1 - Bearing cap for an overhead cam shaft of an internal-combustion engine, and such an engine - Google Patents

Bearing cap for an overhead cam shaft of an internal-combustion engine, and such an engine Download PDF

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Publication number
EP0098180B1
EP0098180B1 EP83401085A EP83401085A EP0098180B1 EP 0098180 B1 EP0098180 B1 EP 0098180B1 EP 83401085 A EP83401085 A EP 83401085A EP 83401085 A EP83401085 A EP 83401085A EP 0098180 B1 EP0098180 B1 EP 0098180B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
orifice
engine
bearing cap
bolts
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.)
Expired
Application number
EP83401085A
Other languages
German (de)
French (fr)
Other versions
EP0098180A1 (en
Inventor
Gérard Bortolussi
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0098180A1 publication Critical patent/EP0098180A1/en
Application granted granted Critical
Publication of EP0098180B1 publication Critical patent/EP0098180B1/en
Expired legal-status Critical Current

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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
    • F01L1/0532—Camshafts overhead type the cams being directly in contact with the driven valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]

Definitions

  • the invention relates to a bearing cap for an internal combustion engine of the type comprising at least one overhead camshaft journalling in bearings, one half of which is formed in a cylinder head fixed by screws on the cylinder block and the l The other half is formed in caps connected by screws to the cylinder head.
  • the invention proposes to remedy these drawbacks.
  • a bearing cap for an internal combustion engine of the aforementioned type characterized in that it comprises an orifice located between the camshaft and one of its fixing screws on the cylinder head, this orifice being intended for the passage of a cylinder head screw.
  • the orifice is tapped for the screwing of a sealed cover.
  • each bearing cap is common to the two shafts, comprises between them a single central hole for the passage of a fixing screw, and has a passage orifice a cylinder head screw between each camshaft and this central hole.
  • the invention also relates to an internal combustion engine of the aforementioned type, fitted with bearing caps as defined above.
  • the camshaft 5 controls, by means of pushers 9, exhaust valves 10, at a rate of two per cylinder, while the camshaft 4 controls, by means of pushers 11, inlet valves 12, also at the rate of two per cylinder.
  • the pushers 9 and 11 have been shown diagrammatically by their axes in FIG. 1.
  • the pushers 9 and 11 slide in bores 13, 14 formed in the cylinder head. Their axes X-X and Y-Y converge towards the cylinder block, the two shafts 4 and 5 being located near each lateral edge of the cylinder head.
  • the invention thus makes it possible to reduce the angle formed by the axes of the intake and exhaust valves, which reduces the bulk, simplifies the shape of the combustion chamber in the cylinders and makes it possible to obtain high values. compression compression ratio without the need for complex piston shapes.

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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)

Description

L'invention se rapporte à un chapeau de palier pour moteur à combustion interne du type comportant au moins un arbre à cames en tête tourillonnant dans des paliers dont une moitié est formée dans une culasse fixée par des vis sur le bloc-cylindres et dont l'autre moitié est formée dans des chapeaux reliés par des vis à la culasse.The invention relates to a bearing cap for an internal combustion engine of the type comprising at least one overhead camshaft journalling in bearings, one half of which is formed in a cylinder head fixed by screws on the cylinder block and the l The other half is formed in caps connected by screws to the cylinder head.

On sait que le serrage d'une culasse sur un bloc-cylindres doit satisfaire à de nombreuses exigences qui laissent peu de latitude dans le choix de l'emplacement des vis de culasse. D'autre part, ces vis doivent rester accessibles, malgré la présence des organes de distribution qui commandent la levée des soupapes. C'est ainsi qu'on peut être conduit, dans les moteurs du type ci-dessus, à déporter plus que nécessaire un arbre à cames en tête, de façon à ce que les chapeaux de ses paliers laissent accessibles les vis de culasse. Ceci s'oppose à la recherche d'une plus grande compacité du moteur et peut conduire à une plus grande complexité de la forme de la chambre de combustion, du fait de l'inclinaison des soupapes.It is known that the tightening of a cylinder head on a cylinder block must satisfy many requirements which leave little latitude in the choice of the location of the cylinder head screws. On the other hand, these screws must remain accessible, despite the presence of the distribution members which control the lifting of the valves. This is how one can be led, in engines of the above type, to offset more than necessary a camshaft at the head, so that the caps of its bearings leave accessible the cylinder head screws. This is opposed to the search for greater compactness of the engine and can lead to greater complexity in the shape of the combustion chamber, due to the inclination of the valves.

L'invention se propose de remédier à ces inconvénients. A cet effet, elle a pour objet un chapeau de palier pour moteur à combustion interne du type précité, caractérisé en ce qu'il comporte un orifice situé entre l'arbre à cames et l'une de ses vis de fixation sur la culasse, cet orifice étant destiné au passage d'une vis de culasse.The invention proposes to remedy these drawbacks. For this purpose, it relates to a bearing cap for an internal combustion engine of the aforementioned type, characterized in that it comprises an orifice located between the camshaft and one of its fixing screws on the cylinder head, this orifice being intended for the passage of a cylinder head screw.

De préférence, l'orifice est taraudé en vue du vissage d'un couvercle étanche.Preferably, the orifice is tapped for the screwing of a sealed cover.

Suivant une disposition avantageuse, lorsque le moteur comporte deux arbres à cames en tête, chaque chapeau de palier est commun aux deux arbres, comporte entre ceux-ci un trou central unique de passage d'une vis de fixation, et présente un orifice de passage d'une vis de culasse entre chaque arbre à cames et ce trou central.According to an advantageous arrangement, when the engine comprises two camshafts at the head, each bearing cap is common to the two shafts, comprises between them a single central hole for the passage of a fixing screw, and has a passage orifice a cylinder head screw between each camshaft and this central hole.

L'invention a également pour objet un moteur à combustion interne du type précité, équipé de chapeaux de paliers tels que définis ci-dessus.The invention also relates to an internal combustion engine of the aforementioned type, fitted with bearing caps as defined above.

Un exemple d'application de l'invention à un moteur à deux arbres à cames en tête fait l'objet de la description qui suit, en référence aux dessins joints dans lesquels :

  • La Figure 1 est une vue de dessus d'un chapeau de palier suivant l'invention ;
  • La Figure 2 est une coupe prise suivant la ligne 2-2 de la Fig. 1.
An example of application of the invention to an engine with two overhead camshafts is the subject of the description which follows, with reference to the accompanying drawings in which:
  • Figure 1 is a top view of a bearing cap according to the invention;
  • Figure 2 is a section taken on line 2-2 of Fig. 1.

On voit sur la Fig. 2 une partie d'un bloc-cylindres 1 d'un moteur à combustion interne. Une culasse 2 est fixée sur ce bloc-cylindres 1 au moyen de vis 3. Deux arbres à cames en tête 4, 5 tourillonnent dans des paliers 6, 7 formés pour moitié dans la culasse 2 et pour moitié dans des chapeaux de paliers communs 8 de forme allongée, perpendiculaires aux deux arbres (Fig. 1).We see in Fig. 2 a part of a cylinder block 1 of an internal combustion engine. A cylinder head 2 is fixed to this cylinder block 1 by means of screws 3. Two overhead camshafts 4, 5 rotate in bearings 6, 7 formed half in the cylinder head 2 and half in common bearing caps 8 elongated, perpendicular to the two trees (Fig. 1).

Dans l'exemple représenté, l'arbre à cames 5 commande, par l'intermédiaire de poussoirs 9, des soupapes d'échappement 10, à raison de deux par cylindre, tandis que l'arbre à cames 4 commande, par l'intermédiaire de poussoirs 11, des soupapes d'admission 12, également à raison de deux par cylindre. Les poussoirs 9 et 11 ont été schématisés par leurs axes sur la Fig. 1. Les poussoirs 9 et 11 coulissent dans des alésages 13, 14 ménagés dans la culasse. Leurs axes X-X et Y-Y convergent vers le bloc-cylindres, les deux arbres 4 et 5 se trouvant près de chaque bord latéral de la culasse.In the example shown, the camshaft 5 controls, by means of pushers 9, exhaust valves 10, at a rate of two per cylinder, while the camshaft 4 controls, by means of pushers 11, inlet valves 12, also at the rate of two per cylinder. The pushers 9 and 11 have been shown diagrammatically by their axes in FIG. 1. The pushers 9 and 11 slide in bores 13, 14 formed in the cylinder head. Their axes X-X and Y-Y converge towards the cylinder block, the two shafts 4 and 5 being located near each lateral edge of the cylinder head.

Le chapeau de paliers 8, commun aux deux arbres 4 et 5, est fixé sur la culasse 2 par des goujons extrêmes 15, 16 situés entre les arbres et les bords latéraux de la culasse, et par un goujon central 17. Entre ce dernier et chacun des arbres à cames, le chapeau 8 présente un orifice 18. Chaque orifice 18 a un axe orthogonal à l'axe des arbres à cames, est situé à proximité immédiate de l'arbre 4 ou 5 correspondant et se trouve dans le prolongement d'un orifice 19 ménagé dans la culasse 2 au droit d'une des vis 3. L'orifice 19 laisse passer la tête de la vis 3 et se prolonge vers le bloc-cylindres par un orifice 20 plus étroit que cette tête, avec interposition d'une cavité 21 qui définit un épaulement d'appui de celle-ci.The bearing cap 8, common to the two shafts 4 and 5, is fixed to the cylinder head 2 by end studs 15, 16 situated between the shafts and the lateral edges of the cylinder head, and by a central stud 17. Between the latter and each of the camshafts, the cap 8 has an orifice 18. Each orifice 18 has an axis orthogonal to the axis of the camshafts, is located in the immediate vicinity of the corresponding shaft 4 or 5 and is located in the extension d an orifice 19 formed in the cylinder head 2 in line with one of the screws 3. The orifice 19 lets the head of the screw 3 pass and is extended towards the cylinder block by an orifice 20 narrower than this head, with interposition a cavity 21 which defines a support shoulder for the latter.

Au moins dans leur partie opposée à la culasse, les orifices 18 sont taraudés pour recevoir des bouchons 22 qui servent à la fixation d'un couvercle étanche 23 (non représenté à ta Fig. 1, dans un but de clarté). Plus précisément, le couvercle 23 est destiné à s'appliquer à joint étanche par sa périphérie sur celle de la culasse, et il présente au droit de chaque orifice 18 un trou lisse 24 dans lequel un bouchon 22 est reçu à rotation et à joint étanche. Lorsqu'on visse les bouchons dans les orifices 18, leur tête s'applique sur la périphérie dans les orifices 18, leur tête s'applique sur la périphérie extérieure des trous 24 et presse le couvercle 23 sur la culasse. Il est à noter que dans certains agencements, il peut suffire que seulement certains trous 18 soient taraudés.At least in their part opposite to the cylinder head, the orifices 18 are tapped to receive plugs 22 which are used for fixing a sealed cover 23 (not shown in FIG. 1, for clarity). More specifically, the cover 23 is intended to be applied with a seal by its periphery on that of the cylinder head, and it has, at the level of each orifice 18, a smooth hole 24 in which a plug 22 is received in rotation and with a seal . When the plugs are screwed into the orifices 18, their head is applied to the periphery in the orifices 18, their head is applied to the external periphery of the holes 24 and presses the cover 23 on the cylinder head. It should be noted that in certain arrangements, it may suffice that only certain holes 18 are tapped.

On voit que, grâce à la disposition qui vient d'être décrite, l'implantation des organes de distribution se trouve grandement facilitée, même dans le cas, complexe, d'un moteur à deux arbres à cames en tête et quatre soupapes par cylindre.It can be seen that, thanks to the arrangement which has just been described, the installation of the distribution members is greatly facilitated, even in the complex case, of an engine with two overhead camshafts and four valves per cylinder. .

En particulier, il est possible de placer les arbres à cames très près de l'axe des vis de culasse, tout en maintenant l'accessibilité totale de ces vis et en conservant la face d'appui de leur tête de serrage au-delà des zones des poussoirs comme représenté, ce qui évite tout risque de déformation de ces zones.In particular, it is possible to place the camshafts very close to the axis of the cylinder head bolts, while maintaining the total accessibility of these bolts and retaining the bearing face of their tightening head beyond the areas of the pushers as shown, which avoids any risk of deformation of these areas.

L'invention permet ainsi de réduire l'angle formé par les axes des soupapes d'admission et d'échappement, ce qui réduit l'encombrement, simplifie la forme de la chambre de combustion dans les cylindres et permet d'obtenir des valeurs élevées du rapport volumétrique de compression sans faire appel à des formes complexes de pistons.The invention thus makes it possible to reduce the angle formed by the axes of the intake and exhaust valves, which reduces the bulk, simplifies the shape of the combustion chamber in the cylinders and makes it possible to obtain high values. compression compression ratio without the need for complex piston shapes.

Claims (6)

1. A bearing cap for an internal combustion engine of the type comprising at least an overhead cam-shaft (4, 5) journalled in bearings (6, 7) one half of which is formed in a cylinder head (2) secured by bolts (3) to the cylinder block (1) while the other half is formed in caps (8) secured by bolts (15 to 17) to the cylinder head (2), which cap (8) is characterised in that it comprises an orifice (18) located between the cam-shaft (4, 5) and one (17) of its bolts securing it to the cylinder head (2), this orifice (18) being provided for the passage of a cylinder heat bolt. (3).
2. A bearing cap according to claim 1, characterised in that the orifice (18) is adapted to extend an aperture (19-20) formed in the cylinder head and serving to introduce the whole of the cylinder head bolt (3).
3. A bearing cap according to claim 1 or 2, characterised in that the orifice (18) is taped for the purpose of the screwing of a fluidtight cover (23).
4. A bearing cap according to any one of the claims 1 to 3, for an engine having two overhead cam-shafts (4, 5), characterised in that each cap (8) is common to both shafts, includes between the latter a single central aperture for the passage of a securing bolt (17), and has an orifice (18) for the passage of a cylinder head bolt (3) between each cam-shaft and this central aperture.
5. An internal combustion engine, of the type comprising at least an overhead cam-shaft (4, 5) journalled in bearings (6, 7) one halt of which bearings is formed in a cylinder head (2) secured by bolts (3) to the cylinder block while the other half is formed in caps (8) secured by bolts (15 to 17) to the cylinder head (2), characterised in that it comprises bearing caps (8) according to any one of the claims 1 to 4.
6. An engine according to claim 5, characterised in that each bearing cap (8) is according to claim 3 and the cover (23) in secured to the cylinder head (2) by the screwing of a least one fluidtight plug (22) which extends rotatively through an orifice (24) of the cover and is screwed in the confronting orifice (18) of the cap.
EP83401085A 1982-06-14 1983-05-30 Bearing cap for an overhead cam shaft of an internal-combustion engine, and such an engine Expired EP0098180B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8210330A FR2528511A1 (en) 1982-06-14 1982-06-14 BEARING CAP FOR CAMSHAFT AT HEAD OF INTERNAL COMBUSTION ENGINE, AND CORRESPONDING ENGINE
FR8210330 1982-06-14

Publications (2)

Publication Number Publication Date
EP0098180A1 EP0098180A1 (en) 1984-01-11
EP0098180B1 true EP0098180B1 (en) 1985-08-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401085A Expired EP0098180B1 (en) 1982-06-14 1983-05-30 Bearing cap for an overhead cam shaft of an internal-combustion engine, and such an engine

Country Status (4)

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US (1) US4497289A (en)
EP (1) EP0098180B1 (en)
DE (1) DE3360670D1 (en)
FR (1) FR2528511A1 (en)

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US4637367A (en) * 1984-02-28 1987-01-20 Nissan Motor Company, Limited Crankcase emission control system for an internal combustion engine
JPH0646004B2 (en) * 1984-04-11 1994-06-15 ヤマハ発動機株式会社 Camshaft holding structure for internal combustion engine
JPH0646005B2 (en) * 1984-06-12 1994-06-15 ヤマハ発動機株式会社 Bearing structure of valve camshaft
JPS6176712A (en) * 1984-09-21 1986-04-19 Nissan Motor Co Ltd Tappet device for internal-combustion engine
JPS61275546A (en) * 1985-05-30 1986-12-05 Toyota Motor Corp Cooling water path structure for cylinder head of internal combustion engine
DE3541700A1 (en) * 1985-11-26 1987-05-27 Audi Ag INTERNAL COMBUSTION ENGINE WITH AT LEAST ONE OVERHEAD CAMSHAFT
DE3616629A1 (en) * 1986-05-16 1987-11-19 Audi Ag INTERNAL COMBUSTION ENGINE
JPH07642Y2 (en) * 1987-03-06 1995-01-11 日産自動車株式会社 Cylinder head structure of internal combustion engine
JP2717828B2 (en) * 1988-12-09 1998-02-25 ヤマハ発動機株式会社 Cylinder head fastening structure
JP2611838B2 (en) * 1989-06-30 1997-05-21 マツダ株式会社 Camshaft bearing structure for DOHC engine
USRE35382E (en) * 1989-07-14 1996-11-26 Yamaha Hatsudoki Kabushiki Kaisha Lubrication arrangement for engine
FR2669677A1 (en) * 1990-11-28 1992-05-29 Peugeot Internal combustion engine cylinder head for valve control using rocker lever and tappet
JP3089689B2 (en) * 1991-03-20 2000-09-18 スズキ株式会社 Cylinder head oil passage structure
JPH0586813A (en) * 1991-09-20 1993-04-06 Mazda Motor Corp Bearing structure for camshaft
DE4324791A1 (en) * 1993-07-23 1995-01-26 Porsche Ag Cylinder head arrangement of an internal combustion engine
DE4416627A1 (en) * 1994-05-11 1995-11-16 Audi Ag IC engine with cylinder block
DE19729948A1 (en) * 1997-07-12 1999-01-14 Deutz Ag Camshaft bearing frame
EP1101922A3 (en) * 1999-11-22 2002-05-02 Kabushiki Kaisha Toyota Jidoshokki Cylinder head for use in an internal combustion engine
WO2011076959A1 (en) * 2009-12-23 2011-06-30 Amadeo Marti Carbonell, S.A. Device for assembling the cylinder head of an engine
JP6178671B2 (en) * 2013-08-26 2017-08-09 川崎重工業株式会社 Cylinder head bolt fastening structure
DE102013114318B4 (en) * 2013-12-18 2016-09-22 Steyr Motors Gmbh Multi-part crankcase and assembly process

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Also Published As

Publication number Publication date
US4497289A (en) 1985-02-05
EP0098180A1 (en) 1984-01-11
DE3360670D1 (en) 1985-10-03
FR2528511A1 (en) 1983-12-16
FR2528511B1 (en) 1985-03-22

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