EP0399912A1 - Valve cover with oil separator and method for producing same - Google Patents

Valve cover with oil separator and method for producing same Download PDF

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Publication number
EP0399912A1
EP0399912A1 EP19900401389 EP90401389A EP0399912A1 EP 0399912 A1 EP0399912 A1 EP 0399912A1 EP 19900401389 EP19900401389 EP 19900401389 EP 90401389 A EP90401389 A EP 90401389A EP 0399912 A1 EP0399912 A1 EP 0399912A1
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EP
European Patent Office
Prior art keywords
wall
cylinder head
skirt
head cover
free edge
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
EP19900401389
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German (de)
French (fr)
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EP0399912B1 (en
Inventor
Claude Buisson
Fabrice Hauguel
Jean-Noel Jourdan
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.)
LEBRANCHU SA
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LEBRANCHU SA
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Publication date
Application filed by LEBRANCHU SA filed Critical LEBRANCHU SA
Priority to AT90401389T priority Critical patent/ATE84117T1/en
Publication of EP0399912A1 publication Critical patent/EP0399912A1/en
Application granted granted Critical
Publication of EP0399912B1 publication Critical patent/EP0399912B1/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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers

Definitions

  • the present invention relates to a method for manufacturing a cylinder head cover with an oil separator, comprising a first wall having a periphery, a skirt bordering said first wall at its periphery and having a free edge intended to come into tight contact with a cylinder head, said free edge being spaced from said first wall, and a second wall located between said first wall and said free edge and generally spaced from said first wall and said free edge, to delimit an oil settling chamber with said first wall and a first part of said skirt, said first part being adjacent to said first wall, by mutual joining of two mutually nested parts, one of which constitutes said first wall and said skirt and the other of which constitutes said second wall. It also relates to a cylinder head cover obtained by the implementation of this process.
  • Such cylinder head covers can also be produced, as described for example US-A-4,565,164, by stamping and welded assembly of sheet steel parts, in particular when it is mass production for which the cost of the tools to be produced is easily amortized. On this condition, this process is economical it is easy to implement and the cylinder head covers obtained have good rigidity, making it possible to fix them centrally on a cylinder head under the same conditions as the cylinder head covers made by metal alloy casting . However, this rigidity is obtained at the price of a comparatively large weight; furthermore, stamping does not lend itself well to obtaining desired aesthetics.
  • Such cylinder head covers can also be produced by transformation of various plastics, generally reinforced for example by glass fibers; injection or compression are used, for example, depending on the plastics used.
  • Such a process is economical when it comes to producing small and medium series, for which the cost of tooling is economically attractive, and it offers the possibility of obtaining cylinder head covers of desired aesthetics.
  • cylinder head covers have the disadvantage of a critical absence of rigidity, which prevents them from being fixed on a cylinder head by a central fixing, as is the case of cylinder head covers made by metal alloy casting or stamping and assembly of sheet steel parts, unless additional specific bracing is used, which complicates the manufacture of cylinder head covers by this process and increases their cost; also, in this case, the fixing is preferably carried out at the periphery of the cylinder head cover, that is to say at the free edge of its skirt and in the immediate vicinity of the joint, by means of members numerous fasteners distributed over this periphery to minimize the risk of significant deformation, generating leaks, at this level; this comparatively large number of fasteners naturally requires appropriate arrangements both at the level of the cylinder head cover at the level of the cylinder head, and outbids their manufacturing cost; it would also be impossible to equip a cylinder head cover thus produced with a cylinder head initially intended to receive, with a central fixing, a cylinder head cover produced by metal alloy foundry or
  • each of the fixing members ensures individual tightening, against the cylinder head, of the cylinder head cover and of the gasket also provided in such a case, it is difficult to ensure a uniform distribution of the clamping forces despite the large number of fasteners; if one wishes to obtain such a uniform distribution, one is obliged to have recourse to devices such as a rigid frame, for example metallic, of pressure distribution covering the periphery of the cylinder head cover opposite the cylinder head to offer support for the fixing members, as described for example EP-A-0 070 500 in the case of a single-walled cylinder head cover, which complicates and makes the manufacture of the cylinder head cover more expensive.
  • devices such as a rigid frame, for example metallic, of pressure distribution covering the periphery of the cylinder head cover opposite the cylinder head to offer support for the fixing members, as described for example EP-A-0 070 500 in the case of a single-walled cylinder head cover, which complicates and makes the manufacture of the cylinder head cover more expensive.
  • the object of the present invention is to propose a method for manufacturing a cylinder head cover with an oil separator which makes it possible to remedy these drawbacks.
  • Such a method is particularly economical to use, whether the said first part is made of thermoplastic plastic or of thermosetting plastic, transformed by the most appropriate method, suitably chosen by a person skilled in the art, and in particular when the said second part is produced by stamping a metal blank.
  • the rigidity of the second part which is much higher than that of the first part, and its method of fitting into the latter make it possible to provide the cylinder head cover as a whole with good rigidity, compatible with a central fixing such that 'it has been defined above; it will be observed that the rigidity of the second part can be obtained for a reduced wall thickness of this part due to its box shape, which makes it possible to produce the entire cylinder head cover for a weight of the same order of magnitude as that of cylinder head covers in metal alloy based on aluminum, that is to say for a much lower weight than that of cylinder head covers entirely produced by stamping and assembly of sheet steel parts.
  • joining generally means mutual support without penetration; these joining means can be attached to said first and second parts but, preferably, they are produced as an integral part of said first part or of said second part during step a.
  • These joining means can have the function of delimiting passages inside the oil settling chamber.
  • a similar arrangement of corresponding holes, associated with attachment means, can also be adopted in other locations of the cylinder head cover, and for example as means of filling the engine with the oil cover.
  • Such joining means are also of interest insofar as they facilitate step b of the method according to the invention, and in particular the mutual joining of said first and second parts when provision is made for this purpose.
  • mutual of said rim and said second part of said skirt indeed, it is then advantageously possible to provide as such, during step a, lugs integral with said second part of said skirt, in the immediate vicinity of said free edge, said lugs being suitable for serving as support for said edge in a direction corresponding to a mutual separation of said first and second walls in said determined relative position; in this case, during step b, said second piece is fitted into said first piece, with elastic deformation of said flange and / or of said skirt when said lugs pass and until said first and second walls come into abutment mutual by means of said joining means, and said elastic deformation is then stopped to place said flange bearing on said lugs in a direction corresponding to a mutual distance from said first and second walls; in a particularly simple and economical manner, the pins can be produced in the form of integral
  • a cylinder head cover in accordance with the invention may have any arrangement capable of increasing its functionality and / or aesthetics and, in particular, may receive any insert for this purpose on the first part as on the second part, by appropriate means.
  • the present invention relates also a cylinder head cover with oil separator, comprising two mutually integral and mutually interlocking parts, one of which constitutes on the one hand a first wall having a periphery and on the other hand a skirt bordering said first wall at its periphery and having a free edge intended to come into tight contact with a cylinder head, said free edge being spaced from said first wall, and the other of which constitutes a second wall located between said first wall and said free edge and generally spaced from said first wall and of said free edge, to delimit an oil settling chamber with said first wall and a first part of said skirt, said first part being adjacent to said first wall, characterized in that said first wall and said skirt are made in a single first piece of plastic material and in that said second wall is made in one single second metal part with a
  • This cylinder head cover preferably has the various structural characteristics resulting from the various preferred embodiments of the method according to the invention as defined above.
  • FIG. 1 and 2 show respective sections, by mutually parallel vertical planes, of the same cylinder head cover produced in accordance with the present invention, and assumed to occupy a general horizontal orientation, without any need to be deduced therefrom limitation as to the possibilities of using a cylinder head cover produced in accordance with the present invention in other orientations.
  • the first aforementioned first part or cover is designated by 1, which is produced from thermoplastic or thermosetting material, transformed by any suitable process suitably chosen by a person skilled in the art and possibly reinforced or loaded, and by 2 the second.
  • aforementioned room or interior partition made of sheet metal or a metal alloy
  • the cover 1 is for example made by injection of polyamide loaded with glass fibers or polyester loaded with glass fibers and the internal partition 2 by stamping of a steel sheet, these examples however not being in any way limiting; also by way of nonlimiting example, the cover 1 may have a wall thickness of the order of 3 mm and the internal partition 2 a wall thickness of the order of 1.5 mm.
  • the cover 1 thus brings together in one piece a wall 3 constituting the upper wall of the cylinder head cover, with any desired shape reconciling aesthetic and functional requirements and a skirt 4 bordering said first wall 3 along a periphery 5 thereof.
  • this skirt 4 itself has a continuous free edge 6 downwards, general planar configuration intended to come into tight contact with a planar upper face 7 of a cylinder head 8; for this purpose, the free edge 6, which corresponds to an increase in thickness of the skirt 4, has a continuous groove 9 downwards, advantageously produced during the manufacture of the cover 1 and receiving a continuous seal 10 for sealing against screw of the upper face 7 of the cylinder head 8.
  • the wall 3 has several holes, with respective vertical axes.
  • a hole 11 intended for filling the crankcase (not shown) with oil via the cylinder head cover;
  • this hole 11 has a vertical axis 14 transversely to which it has a circular section, and it is bordered respectively below the wall 3 and above the latter of continuous annular flanges, respectively 12 and 13, themselves annular of revolution around axis 14;
  • the rim 13 is intended to receive a plug (not shown) and has for this purpose a partial helical thread 15, which is produced like the two rims 12 and 13 in one piece with the entire cover 1.
  • the wall 3 Downwards, in addition to the respective edges 12 and 18 of the holes 11 and 16, the wall 3 has projecting ribs or other reliefs 26 ensuring an abutment vis-à-vis the internal partition 2 as will appear below, to serve both precise positioning means of the interior partition 2 inside the cover 1, stiffening means of the cover 1 on the one hand intrinsically and on the other hand by pressing on the interior partition 2, and finally partitioning an oil decanting chamber 27 which delimit between them the cover and the inner partition 2, as will readily be deduced from the following description.
  • the internal partition 2 also comprises a wall 28 constituting its upper part and having a periphery 29 along which this wall carries, in one piece with it, a continuous peripheral rim 30 turned downwards.
  • the wall 28 is located below the wall 3, with respect to which it occupies a determined position and of which it is in particular kept apart by pressing against the joining ribs 26 so as to delimit the aforementioned chamber 27. It is also kept spaced from the wall 3 by pressing, against the latter, at least one localized projection boss 31 forming an integral part of the internal partition 2, it being understood that other localized bosses can also be provided at this effect in the wall 28 as will emerge from the following description; the boss 31 borders in the example illustrated a hole 32 passing right through the wall 28 along the axis 14, which hole 32 has transverse to the axis 14 a circular section such that it fits around the rim 12 of the hole 11 around this hole 32, consequently intended like the hole 11 for filling the crankcase with engine oil fitted with the cylinder head cover, is bordered peripherally by a flat area 33 of the boss 31, which flat area is perpendicular to the axis 14 and leans flat against an area 34, also flat and perpendicular to the axis 14, provided in the wall 3 around
  • Another hole 37 is arranged in the wall 28, coaxially with the hole 21 of the wall 3 and directly opposite of it to allow the passage of the stud 23 or any other suitable fixing member; in this zone, the walls 3 and 28 are also in mutual support, around the holes 21 and 37 and in the immediate vicinity of the latter, by a localized boss 50 of the wall 28 thus allowing, by localized joining of the walls 3 and 28, to transfer onto the wall 28 the tightening forces applied to the wall 3, around the hole 21, by the nut 24 in the example illustrated, or by any other similar component of the elements for fixing the cylinder head cover to the cylinder head 8 ; preferably, as around the holes 11 and 32, the mutual support of the wall 3 and the localized boss 50 of the wall 28 around the holes 21 and 37 is effected by respective zones 51, 52, flat and perpendicular to the axis 22, which the wall 3 and the boss 50 have respectively around the hole 21 and around the hole 37; these zones 51 and 52, for example annular of revolution around the axis 22, are sealed together for example by means of
  • the rim 30 has meanwhile in the example illustrated two zones due to an upper zone 38 directly adjacent to the periphery 29 of the wall 28 and a lower zone 39 which is connected to the upper zone 38 by a shoulder 40 and presents downward a continuous free edge 41, plane, located in the immediate vicinity of the free edge 6 of the skirt 4 in the sense that, although being located above this edge 6, it is vertically distant from it by a distance much smaller than the dimensions vertically separating this edge 41 of the wall 28 or the edge 6 of the wall 3; the edge 41 is parallel to the edge 6, that is to say horizontal in the orientation illustrated by way of nonlimiting example in the figures.
  • the rim 30 is thus placed opposite the skirt 4, inside the cover 1 its upper zone 38 is placed opposite a first part 42 of the skirt 4, which first part is directly adjacent to the periphery 5 of the wall 3, and the upper zone 38 of the rim 30 is separated from this first part 42 so as to define with the latter, like the wall 28 with the wall 3, the chamber 27 for decanting oil.
  • the shoulder 40 constitutes, in the rim 30 and with respect to the upper zone 38 thereof, a deflection towards the skirt 4 and under this shoulder 40, the lower zone 39 of the rim 30 closely follows a second part 43 of the skirt 4, namely the part of this skirt 4 which extends from the level of the shoulder 40 to the level of the lower edge 41 of the rim 30.
  • the skirt 4 like the rim 30 widens slightly downwards, although having an orientation close to a vertical orientation. so that, by the lower zone 39 of its rim 30, the internal partition 2 fits tightly into the cover 1, through the part 43 of the skirt 4 thereof, in the manner of a conical fitting.
  • the cover 1 has. in a single piece after its manufacture, a plurality of lugs 44 which form an inward projection of the cover 1 relative to an extension 45 of the second part 43 of the skirt 4 to the edge 6 thereof .
  • Each of these lugs 44 has upward a flat upper face 46 horizontal or substantially horizontal in the example illustrated, that is to say parallel to the edge 6 but turned in the opposite direction relative to the latter. which face 46 serves to support the edge 41 of the internal partition 2 downwards with respect to the cover 1.
  • each lug has towards the inside of the cover 1 a face 48, for example planar, connecting the face 46 to the extension 45 of the part 43 of the skirt 4 and thus giving each lug 44 the shape of a wedge forming a progressively greater and greater projection, relative to the above-mentioned extension 45, from bottom to top.
  • the seal 36 is inserted into the groove 35, just as the different grooves 49 bordering the holes 21 in the wall 3 are inserted, respectively the corresponding seals 53, then the interior partition is presented. 2, by its wall 28, facing the cover 1, by the free edge 6 thereof. Then, by a movement corresponding to a mutual approximation of the walls 3 and 21, the internal partition 2 is inserted into the cover 1, which causes the passage of the lower zone 39 of the rim 30 opposite the faces 48 of the lugs 44, forming cam faces, a progressive elastic deformation of the rim 30 and / or of the part 43 of the skirt 4 and of the extension 45 of this part 43.
  • a cylinder head cover according to the present invention may include other constituent parts, attached to one or the other of the parts 1 and 2 by any means. appropriate, in particular related to the nature of the material of which these parts are made.
  • the figures illustrate the fixing, for example by welding, fitting, crimping, on the internal partition 2, of a separating plate 54 inserted locally in the chamber 27 decanting oil and a breather 55 opening into this chamber through the wall 28, on the one hand, and inside the interior partition 2, below this wall 28, on the other hand; the mounting by clipping, on the skirt 4 of the cover 1, has also been illustrated of a localized cover 56 intended to conceal cables 57 by aesthetically completing the cover 1, this localized cover 56 advantageously made of plastic material which can also be fixed by other means on the cover 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Gasket Seals (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

The present invention relates to a method for producing a cylinder-head cover with oil separator and to a cylinder-head cover capable of being produced by this method. Into a first plastic piece (1) combining a wall (3) and a skirt (4) bordering this wall peripherally is inserted a second piece grouping a wall (28), delimiting with the abovementioned wall (3) an oil-separation chamber (27), and a rim (30) bordering this wall (28) peripherally and matching the skirt (4) of the first piece (1) up to the immediate vicinity of the free edge (6) of this skirt (4). The second piece (2), made of metal, stiffens the first piece (1) and, in particular, makes it possible to transfer to the immediate vicinity of the free edge (6) of the skirt (4) of the latter, intended to be laid against a face (7) of a cylinder head (8), forces clamping the cylinder-head cover against this face, which are exerted centrally on the cylinder-head cover (clamping member 23, 24, 25), especially when bracing means (26, 31) are provided between the respective walls (3, 28) of the two pieces (1, 2). Aesthetically pleasing, rigid and light-weight cylinder-head covers can thus be produced economically. <IMAGE>

Description

La présente invention concerne un procédé de fabrication d'un couvre-culasse à décanteur d'huile, comportant une première paroi présentant une périphérie, une jupe bordant ladite première paroi à sa périphérie et présentant un bord libre destiné à venir en contact étanche avec une culasse, ledit bord libre étant espacé de ladite première paroi, et une deuxième paroi située entre ladite première paroi et ledit bord libre et généralement espacée de ladite première paroi et dudit bord libre, pour délimiter une chambre de décantation d'huile avec ladite première paroi et une première partie de ladite jupe, ladite première partie étant adjacente à ladite première paroi, par solidarisation mutuelle de deux pièces mutuellement emboîtées dont l'une constitue ladite première paroi et ladite jupe et dont l'autre constitue ladite deuxième paroi. Elle concerne également un couvre-culasse obtenu par la mise en oeuvre de ce procédé.The present invention relates to a method for manufacturing a cylinder head cover with an oil separator, comprising a first wall having a periphery, a skirt bordering said first wall at its periphery and having a free edge intended to come into tight contact with a cylinder head, said free edge being spaced from said first wall, and a second wall located between said first wall and said free edge and generally spaced from said first wall and said free edge, to delimit an oil settling chamber with said first wall and a first part of said skirt, said first part being adjacent to said first wall, by mutual joining of two mutually nested parts, one of which constitutes said first wall and said skirt and the other of which constitutes said second wall. It also relates to a cylinder head cover obtained by the implementation of this process.

Actuellement, de tels couvre-culasses, destinés aux moteurs thermiques, notamment de véhicules automobiles, et également dénommes "cache-culbuteurs", sont fabriqués de trois manières différentes.Currently, such cylinder head covers, intended for heat engines, in particular for motor vehicles, and also called "rocker covers", are manufactured in three different ways.

Ils peuvent être réalisés par fonderie d'alliage métallique, avec une finition par usinage. Ce procédé présente l'inconvénient d'être coûteux d'une part du fait qu'un souci de légèreté conduit à choisir un alliage métallique à base d'aluminium et d'autre part du fait d'un besoin de finition par usinage il présente également l'inconvénient d'une difficulté d'obtenir des chambres de décantation complexes et étroites par noyautage. Par contre, il est ainsi possible d'obtenir des couvre-culasses présentant d'une part une esthétique recherchée, et d'autre part une bonne rigidité permettant de n'utiliser, pour les fixer sur une culasse, que quelques organes de fixation, par exemple au nombre de deux ou trois, placés centralement, c'est-à-dire traversant de part en part les première et deuxième parois, à l'intérieur de la jupe un tel mode de fixation est généralement considéré comme avantageux d'une part pour des raisons de simplicité d'aménagement du couvre-culasse et de la culasse à cet effet et d'autre part dans la mesure où il permet de répartir de façon aussi homogène que possible les efforts de serrage entre le bord libre de la jupe, généralement muni d'un joint rapporté, et la culasse sans risque de déformation à ce niveau.They can be made by a metal alloy foundry, with a finishing by machining. This method has the disadvantage of being costly on the one hand because a concern for lightness leads to choosing a metal alloy based on aluminum and on the other hand because of a need for finishing by machining it has also the disadvantage of a difficulty in obtaining complex and narrow settling chambers by coring. On the other hand, it is thus possible to obtain cylinder head covers having on the one hand a desired aesthetic, and on the other hand a good rigidity making it possible to use, for fixing them to a cylinder head, only a few fixing members, for example two or three, placed centrally, that is to say through right through the first and second walls, inside the skirt such a method of attachment is generally considered to be advantageous from a on the one hand for reasons of simplicity of arrangement of the cylinder head cover and of the cylinder head for this purpose and on the other hand insofar as it allows the clamping forces to be distributed as homogeneously as possible between the free edge of the skirt , generally fitted with an attached gasket, and the cylinder head without risk of deformation at this level.

De tels couvre-culasses peuvent également être réalisés, comme le décrit par exemple US-A-4 565 164, par emboutissage et assemblage soudé de pièces en tôle d'acier, notamment lorsqu'il s'agit de fabrications en grande série pour lesquelles le coût de l'outillage à réaliser est aisément amortissable. A cette condition, ce procédé est économique il est facile à mettre en oeuvre et les couvre-culasses obtenus présentent une bonne rigidité, permettant de les fixer centralement sur une culasse dans les mêmes conditions que les couvre-culasses réalisés par fonderie d'alliage métallique. Cependant, cette rigidité s'obtient au prix d'un poids comparativement important ; en outre, l'emboutissage se prête mal à l'obtention d'esthétiques recherchées.Such cylinder head covers can also be produced, as described for example US-A-4,565,164, by stamping and welded assembly of sheet steel parts, in particular when it is mass production for which the cost of the tools to be produced is easily amortized. On this condition, this process is economical it is easy to implement and the cylinder head covers obtained have good rigidity, making it possible to fix them centrally on a cylinder head under the same conditions as the cylinder head covers made by metal alloy casting . However, this rigidity is obtained at the price of a comparatively large weight; furthermore, stamping does not lend itself well to obtaining desired aesthetics.

Enfin, de tels couvre-culasses peuvent également être réalisés par transformation de matières plastiques diverses, généralement renfor­cées par exemple par des fibres de verre ; on utilise par exemple l'injection ou la compression selon les matières plastiques utilisées. Un tel procédé est économique lorsqu 'il s'agit de réaliser des séries petites et moyennes, pour lesquelles le coût de l'outillage est économiquement intéressant, et il offre la possibilité d'obtenir des couvre-culasses d'esthétique recherchée. Toutefois, ces couvre-culasses présentent l'inconvénient d'une absence critique de rigidité, ce qui interdit de les fixer sur une culasse par une fixation centrale, comme c'est le cas des couvre-culasses réalisés par fonderie d'alliage métallique ou emboutissage et assemblage de pièces en tôle d'acier, à moins d'avoir recours à un entretoisement spécifique complémentaire, qui complique la fabrication de couvre-culasses par ce procédé et augmente leur coût ; aussi, dans ce cas, la fixation s'effectue de préférence au niveau de la périphérie du couvre-culasse, c'est-à-dire au niveau du bord libre de sa jupe et à proximité immédiate du joint, au moyen d'organes de fixation nombreux répartis sur cette périphérie pour minimiser les risques de déformation importante, génératrice de fuites, à ce niveau ; ce nombre comparativement important d'organes de fixation nécessite naturellement des dispositions appropriées aussi bien au niveau du couvre-culasse qu'au niveau de la culasse, et surenchérit leur coût de fabrication ; il serait en outre impossible d'équiper d'un couvre-culasse ainsi réalisé une culasse initialement prévue pour recevoir, avec une fixation centrale, un couvre-culasse réalisé par fonderie d'alliage métallique ou emboutissage et assemblage de pièces en tôle d'acier ; enfin, dans la mesure où chacun des organes de fixation assure individuellement un serrage, contre la culasse, du couvre-culasse et du joint d'étanchéité également prévu dans un tel cas, il est difficile d'assurer une répartition uniforme des efforts de serrage en dépit du nombre important des organes de fixation ; si l'on désire obtenir une telle répartition uniforme, on est obligé d'avoir recours à des artifices tels qu'un cadre rigide, par exemple métallique, de répartition de pression couvrant la périphérie du couvre­culasse à l'opposé de la culasse pour offrir un appui aux organes de fixation, comme le décrit par exemple EP-A-0 070 500 dans le cas d'un couvre-culasse à paroi unique, ce qui complique et renchérit la fabrication du couvre-culasse.Finally, such cylinder head covers can also be produced by transformation of various plastics, generally reinforced for example by glass fibers; injection or compression are used, for example, depending on the plastics used. Such a process is economical when it comes to producing small and medium series, for which the cost of tooling is economically attractive, and it offers the possibility of obtaining cylinder head covers of desired aesthetics. However, these cylinder head covers have the disadvantage of a critical absence of rigidity, which prevents them from being fixed on a cylinder head by a central fixing, as is the case of cylinder head covers made by metal alloy casting or stamping and assembly of sheet steel parts, unless additional specific bracing is used, which complicates the manufacture of cylinder head covers by this process and increases their cost; also, in this case, the fixing is preferably carried out at the periphery of the cylinder head cover, that is to say at the free edge of its skirt and in the immediate vicinity of the joint, by means of members numerous fasteners distributed over this periphery to minimize the risk of significant deformation, generating leaks, at this level; this comparatively large number of fasteners naturally requires appropriate arrangements both at the level of the cylinder head cover at the level of the cylinder head, and outbids their manufacturing cost; it would also be impossible to equip a cylinder head cover thus produced with a cylinder head initially intended to receive, with a central fixing, a cylinder head cover produced by metal alloy foundry or stamping and assembly of sheet steel parts. ; finally, insofar as each of the fixing members ensures individual tightening, against the cylinder head, of the cylinder head cover and of the gasket also provided in such a case, it is difficult to ensure a uniform distribution of the clamping forces despite the large number of fasteners; if one wishes to obtain such a uniform distribution, one is obliged to have recourse to devices such as a rigid frame, for example metallic, of pressure distribution covering the periphery of the cylinder head cover opposite the cylinder head to offer support for the fixing members, as described for example EP-A-0 070 500 in the case of a single-walled cylinder head cover, which complicates and makes the manufacture of the cylinder head cover more expensive.

Le but de la présente invention est de proposer un procédé de fabrication d'un couvre-culasse à décanteur d'huile permettant de remédier à ces inconvénients.The object of the present invention is to propose a method for manufacturing a cylinder head cover with an oil separator which makes it possible to remedy these drawbacks.

A cet effet, la présente invention propose un procédé de fabrication d'un couvre-culasse à décanteur d'huile du type indiqué en préambule, caractérisé par la succession des étapes consistant à :

  • a) réaliser d'une part une première pièce en matière plastique réunissant ladite première paroi et ladite jupe et d'autre part une deuxième pièce métallique réunissant ladite deuxième paroi et un rebord propre à épouser jusqu'à proximité immédiate dudit bord libre une deuxième partie de ladite jupe, à l'intérieur de ladite première pièce en matière plastique, ladite deuxième partie étant située entre ladite première partie de ladite jupe et ledit bord libre, et
  • b) emboîter ladite deuxième pièce métallique dans ladite première pièce en matière plastique de telle sorte que ledit rebord épouse jusqu'à proximité immédiate dudit bord libre ladite deuxième partie de ladite jupe, à l'intérieur de ladite première pièce en matière plastique, et solidariser mutuellement lesdites première et deuxième pièces respecti­vement en matière plastique et métallique.
To this end, the present invention provides a method of manufacturing a cylinder head cover with an oil separator of the type indicated in the preamble, characterized by the succession of steps consisting in:
  • a) produce, on the one hand, a first piece of plastic material joining said first wall and said skirt and, on the other hand, a second metal piece joining said second wall and a rim suitable for fitting a second part to close to said free edge of said skirt, inside said first plastic part, said second part being located between said first part of said skirt and said free edge, and
  • b) fitting said second metal part into said first plastic part so that said flange matches said second part of said skirt to the immediate vicinity of said free edge, inside said first plastic part, and securing mutually said first and second parts respectively of plastic and metallic material.

Un tel procédé est particulièrement économique de mise en oeuvre, que l'on réalise ladite première pièce en matière plastique thermoplastique ou en matière plastique thermodurcissable, transformée par le procédé le plus approprié, convenablement choisi par un Homme du métier, et notamment lorsque l'on réalise ladite deuxième pièce par emboutissage d'un flan métallique.Such a method is particularly economical to use, whether the said first part is made of thermoplastic plastic or of thermosetting plastic, transformed by the most appropriate method, suitably chosen by a person skilled in the art, and in particular when the said second part is produced by stamping a metal blank.

Cependant, dans la mesure où la première pièce réunissant la première paroi et la jupe la bordant périphériquement, c'est-à-dire les parties du couvre-culasse qui sont visibles lorsque ce couvre-culasse est fixé sur une culasse, est réalisée en matière plastique, il est possible de lui donner toute esthétique recherchée.However, insofar as the first part joining the first wall and the skirt bordering it peripherally, that is to say the parts of the cylinder head cover which are visible when this cylinder head cover is fixed on a cylinder head, is made in plastic material, it is possible to give it any desired aesthetic.

En outre, la rigidité de la deuxième pièce, bien supérieure à celle de la première pièce, et son mode d'emboîtement dans cette dernière permettent d'assurer au couvre-culasse dans son ensemble une bonne rigidité, compatible avec une fixation centrale telle qu'elle a été définie plus haut ; on observera que la rigidité de la deuxième pièce peut être obtenue pour une épaisseur de paroi réduite de cette pièce en raison de sa forme en caisson, ce qui permet de réaliser l'ensemble du couvre-culasse pour un poids du même ordre de grandeur que celui des couvre-culasses en alliage métallique à base d'aluminium, c'est-à-dire pour un poids beaucoup plus faible que celui des couvre-culasses intégralement réalisés par emboutissage et assemblage de pièces en tôle d'acier.In addition, the rigidity of the second part, which is much higher than that of the first part, and its method of fitting into the latter make it possible to provide the cylinder head cover as a whole with good rigidity, compatible with a central fixing such that 'it has been defined above; it will be observed that the rigidity of the second part can be obtained for a reduced wall thickness of this part due to its box shape, which makes it possible to produce the entire cylinder head cover for a weight of the same order of magnitude as that of cylinder head covers in metal alloy based on aluminum, that is to say for a much lower weight than that of cylinder head covers entirely produced by stamping and assembly of sheet steel parts.

De préférence, on prévoit des moyens d'accolement qui s'interposent entre lesdites première et deuxième parois lors de l'étape b, pour s'opposer à un rapprochement mutuel de ces dernières à partir d'une position relative déterminée ; par "accolement", on entend de façon générale un appui mutuel sans pénétration ; ces moyens d'accolement peuvent être rapportés sur lesdites première et deuxième pièces mais, de préférence, on les réalise comme partie intégrante de ladite première pièce ou de ladite deuxième pièce lors de l'étape a. Ces moyens d'accolement peuvent avoir pour fonction de délimiter des passages à l'intérieur de la chambre de décantation d'huile. Ils présentent un intérêt tout particulier en vue d'une fixation centrale du couvre-culasse dans la mesure ou, à cet effet, on prévoit à titre de moyens de réception d'un organe de fixation du couvre-culasse sur une culasse au moins deux trous aménagés respectivement dans ladite première paroi et dans ladite deuxième paroi et destinés à se faire face dans le couvre-culasse, et, lors de l'étape a ou b, on prévoit à proximité immédiate desdits trous au moins certains desdits moyens d'accolement qui s'interposent entre lesdites première et deuxième parois lors de l'étape b, pour s'opposer à un rapprochement mutuel de ces dernières à partir de ladite position relative déterminée et ainsi s'opposer à une déformation de la première paroi vers la deuxième paroi lorsque les organes de fixation, en pratique généralement des goujons sur lesquels on visse des écrous disposés au-dessus de la première paroi, jouent leur rôle de serrage du couvre-culasse sur une culasse. Une disposition analogue de trous correspondants, associés à des moyens d'accolement, peut être également adoptée en d'autres emplacements du couvre-culasse, et par exemple à titre de moyens de remplissage en huile du moteur muni du couvre-culasse. De préférence, lors de l'étape a ou b, on prévoit sur l'une au moins desdites première et deuxième parois, autour dudit trou correspondant, des moyens d'étanchéification vis-à-vis de l'autre desdites première et deuxième parois, avec laquelle lesdits moyens d'étanchéification viennent en contact d'étanchéification lors de l'étape b ; à cet effet, de façon particulière­ment simple, on peut aménager sur ladite première paroi, autour dudit trou correspondant, une gorge annulaire de réception d'un joint annulaire d'étanchéité dans laquelle on dispose ensuite un joint annulaire d'étan­chéité qui vient en appui sur ladite deuxième paroi, autour dudit trou correspondant, lors de l'étape b.Preferably, means of attachment are provided which are interposed between said first and second walls during step b, in order to oppose a mutual approach of the latter from a determined relative position; "joining" generally means mutual support without penetration; these joining means can be attached to said first and second parts but, preferably, they are produced as an integral part of said first part or of said second part during step a. These joining means can have the function of delimiting passages inside the oil settling chamber. They are of very particular interest with a view to central fixing of the cylinder head cover insofar as, for this purpose, provision is made as means for receiving a member for fixing the cylinder head cover to a cylinder head at least two holes provided respectively in said first wall and in said second wall and intended to face each other in the cylinder head cover, and, during step a or b, at least some of said attachment means are provided in the immediate vicinity of said holes which are interposed between said first and second walls during step b, to oppose a mutual approach of the latter from said determined relative position and thus oppose a deformation of the first wall towards the second wall when the fixing members, in practice generally studs on which nuts are arranged arranged above the first wall, play their role of tightening the cylinder head cover on a c ulasse. A similar arrangement of corresponding holes, associated with attachment means, can also be adopted in other locations of the cylinder head cover, and for example as means of filling the engine with the oil cover. Preferably, during step a or b, provision is made on at least one of said first and second walls, around said corresponding hole, for sealing means with respect to the other of said first and second walls. , with which said sealing means come into sealing contact during step b; for this purpose, in a particularly simple manner, it is possible to arrange on said first wall, around said corresponding hole, an annular groove for receiving an annular seal in which an annular seal is then placed which bears. on said second wall, around said corresponding hole, during step b.

De tels moyens d'accolement présentent également un intérêt dans la mesure où ils facilitent l'étape b du procédé selon l'invention, et notamment la solidarisation mutuelle desdites première et deuxième pièces lorsque l'on prévoit à cet effet des moyens d'encliquetage mutuel dudit rebord et de ladite deuxième partie de ladite jupe ; en effet, on peut alors de façon avantageuse prévoir à ce titre, lors de l'étape a, des ergots solidaires de ladite deuxième partie de ladite jupe, à proximité immédiate dudit bord libre, lesdits ergots étant propres à servir d'appui audit rebord dans un sens correspondant à un éloignement mutuel desdites première et deuxième parois dans ladite position relative déterminée ; dans ce cas, lors de l'étape b, on emboîte ladite deuxième pièce dans ladite première pièce, avec déformation élastique dudit rebord et/ou de ladite jupe au passage desdits ergots et jusqu'à ce que lesdites première et deuxième parois viennent en butée mutuelle par l'intermédiaire desdits moyens d'accole­ment, et l'on fait cesser alors ladite déformation élastique pour placer ledit rebord en appui sur lesdits ergots dans un sens correspondant à un éloignement mutuel desdites première et deuxième parois ; de façon particulièrement simple et économique, les ergots peuvent être réalisés sous forme de parties intégrantes de ladite première pièce lors de l'étape a ; on conçoit aisément que le fait de prévoir de tels ergots s'encliquetant élastiquement sur le rebord de la deuxième pièce permet d'obtenir un assemblage mutuel automatique des première et deuxièmes pièces lors de leur emboîtement mutuel.Such joining means are also of interest insofar as they facilitate step b of the method according to the invention, and in particular the mutual joining of said first and second parts when provision is made for this purpose. mutual of said rim and said second part of said skirt; indeed, it is then advantageously possible to provide as such, during step a, lugs integral with said second part of said skirt, in the immediate vicinity of said free edge, said lugs being suitable for serving as support for said edge in a direction corresponding to a mutual separation of said first and second walls in said determined relative position; in this case, during step b, said second piece is fitted into said first piece, with elastic deformation of said flange and / or of said skirt when said lugs pass and until said first and second walls come into abutment mutual by means of said joining means, and said elastic deformation is then stopped to place said flange bearing on said lugs in a direction corresponding to a mutual distance from said first and second walls; in a particularly simple and economical manner, the pins can be produced in the form of integral parts of said first part during step a; it is easily understood that the fact of providing such lugs snapping elastically on the rim of the second part makes it possible to obtain an automatic mutual assembly of the first and second parts during their mutual interlocking.

Naturellement, un couvre-culasse conforme à l'invention peut présenter toute disposition propre à en augmenter la fonctionnalité et/ou l'esthétique et, notamment, peut recevoir à cet effet sur la première 'pièce comme sur la deuxième pièce tout élément rapporté, par des moyens appropriés.Naturally, a cylinder head cover in accordance with the invention may have any arrangement capable of increasing its functionality and / or aesthetics and, in particular, may receive any insert for this purpose on the first part as on the second part, by appropriate means.

De façon également simple, on peut aménager dans ledit bord libre de ladite jupe, c'est-à-dire dans la première pièce, une gorge de réception d'un joint d'étanchéité du couvre-culasse vis-à-vis d'une culasse.Also in a simple manner, it is possible to arrange in said free edge of said skirt, that is to say in the first part, a groove for receiving a gasket of the cylinder head cover with respect to a cylinder head.

Dans la mesure où un couvre-culasse réalisé selon le procédé conforme à la présente invention présente des caractéristiques structurel­les propres, auxquelles sont liés des avantages propres conciliant les impératifs d'esthétique, de légèreté, de rigidité et d'économie, la présente invention concerne également un couvre-culasse à décanteur d'huile, comportant deux pièces mutuellement solidaires et mutuellement emboîtées, dont l'une constitue d'une part une première paroi présentant une périphérie et d'autre part une jupe bordant ladite première paroi à sa périphérie et présentant un bord libre destiné à venir en contact étanche avec une culasse, ledit bord libre étant espacé de ladite première paroi, et dont l'autre constitue une deuxième paroi située entre ladite première paroi et ledit bord libre et généralement espacée de ladite première paroi et dudit bord libre, pour délimiter une chambre de décantation d'huile avec ladite première paroi et une première partie de ladite jupe, ladite première partie étant adjacente à ladite première paroi, caractérisé en ce que ladite première paroi et ladite jupe sont constituées en une seule première pièce en matière plastique et en ce que ladite deuxième paroi est constituée en une seule deuxième pièce métallique avec un rebord épousant jusqu'à proximité immédiate dudit bord libre une deuxième partie de ladite jupe, à l'intérieur de ladite première pièce en matière plastique, ladite deuxième partie étant située entre ladite deuxième paroi et ledit bord libre, et en ce que sont prévus des moyens de solidarisation mutuelle desdites première et deuxième pièces respecti­vement en matière plastique et métallique.Insofar as a cylinder head cover produced according to the method in accordance with the present invention has its own structural characteristics, to which are linked specific advantages reconciling the requirements of aesthetics, lightness, rigidity and economy, the present invention relates also a cylinder head cover with oil separator, comprising two mutually integral and mutually interlocking parts, one of which constitutes on the one hand a first wall having a periphery and on the other hand a skirt bordering said first wall at its periphery and having a free edge intended to come into tight contact with a cylinder head, said free edge being spaced from said first wall, and the other of which constitutes a second wall located between said first wall and said free edge and generally spaced from said first wall and of said free edge, to delimit an oil settling chamber with said first wall and a first part of said skirt, said first part being adjacent to said first wall, characterized in that said first wall and said skirt are made in a single first piece of plastic material and in that said second wall is made in one single second metal part with a rim conforming, in the immediate vicinity of said free edge, to a second part of said skirt, inside said first plastic part, said second part being located between said second wall and said free edge, and in that there are provided means for mutual securing of said first and second parts respectively of plastic and metal.

Ce couvre-culasse présente de préférence les diverses caractéristiques de structure résultant des differents modes de mise en oeuvre préférés du procédé selon l'invention tels qu'ils ont été définis ci-dessus.This cylinder head cover preferably has the various structural characteristics resulting from the various preferred embodiments of the method according to the invention as defined above.

D'autres caractéristiques et avantages du procédé selon l'invention, ainsi que du couvre-culasse susceptible d'être obtenu par la mise en oeuvre de ce procédé, ressortiront de la description ci-dessous, relative à un exemple non limitatif de mise en oeuvre, ainsi que des dessins annexés qui font partie intégrante de cette description.Other characteristics and advantages of the process according to the invention, as well as of the cylinder head cover which can be obtained by implementing this process, will emerge from the description below, relating to a non-limiting example of implementation. work, as well as the accompanying drawings which form an integral part of this description.

- Les figures 1 et 2 montrent des coupes respectives, par des plans verticaux mutuellement parallèles, d'un même couvre-culasse réalisé conformément à la présente invention, et supposé occupant une orientation générale horizontale, sans que l'on doive en déduire une quelconque limitation quant aux possibilités d'utilisation d'un couvre-culasse réalisé conformément à la présente invention dans d'autres orientations.- Figures 1 and 2 show respective sections, by mutually parallel vertical planes, of the same cylinder head cover produced in accordance with the present invention, and assumed to occupy a general horizontal orientation, without any need to be deduced therefrom limitation as to the possibilities of using a cylinder head cover produced in accordance with the present invention in other orientations.

Sur ces figures, on a désigné par 1 la première pièce précitée ou couvercle, que l'on réalise en matière thermoplastique ou thermo­durcissable, transformée par tout procédé approprié convenablement choisi par un Homme du métier et éventuellement renforcée ou chargée, et par 2 la deuxième pièce précitée ou cloison intérieure, réalisée en métal en feuille ou en alliage métallique ; le couvercle 1 est par exemple réalisé par injection de polyamide chargé de fibres de verre ou de polyester chargé de fibres de verre et la cloison intérieure 2 par emboutissage d'une tôle d'acier, ces exemples n'étant toutefois nullement limitatifs ; à titre d'exemple également non limitatif, le couvercle l peut présenter une épaisseur de paroi de l'ordre de 3 mm et la cloison intérieure 2 une épaisseur de paroi de l'ordre de 1,5 mm.In these figures, the first aforementioned first part or cover is designated by 1, which is produced from thermoplastic or thermosetting material, transformed by any suitable process suitably chosen by a person skilled in the art and possibly reinforced or loaded, and by 2 the second. aforementioned room or interior partition, made of sheet metal or a metal alloy; the cover 1 is for example made by injection of polyamide loaded with glass fibers or polyester loaded with glass fibers and the internal partition 2 by stamping of a steel sheet, these examples however not being in any way limiting; also by way of nonlimiting example, the cover 1 may have a wall thickness of the order of 3 mm and the internal partition 2 a wall thickness of the order of 1.5 mm.

Le couvercle 1 réunit ainsi en une seule pièce une paroi 3 constituant la paroi supérieure du couvre-culasse, avec toute forme recherchée conciliant des impératifs esthétiques et fonctionnels et une jupe 4 bordant ladite première paroi 3 le long d'une périphérie 5 de celle-ci, vers le bas si l'on se réfère à la position illustrée aux figures 1 et 2 ; cette jupe 4 présente elle-même vers le bas un bord libre 6 continu, de configuration générale plane destiné à venir en contact étanche avec une face supérieure plane 7 d'une culasse 8 ; à cet effet, le bord libre 6, qui correspond à une surépaisseur de la jupe 4, présente vers le bas une gorge continue 9, avantageusement réalisée lors de la fabrication du couvercle 1 et recevant un joint continu 10 d'étanchéité vis-à-vis de la face supérieure 7 de la culasse 8.The cover 1 thus brings together in one piece a wall 3 constituting the upper wall of the cylinder head cover, with any desired shape reconciling aesthetic and functional requirements and a skirt 4 bordering said first wall 3 along a periphery 5 thereof. ci, downwards if one refers to the position illustrated in Figures 1 and 2; this skirt 4 itself has a continuous free edge 6 downwards, general planar configuration intended to come into tight contact with a planar upper face 7 of a cylinder head 8; for this purpose, the free edge 6, which corresponds to an increase in thickness of the skirt 4, has a continuous groove 9 downwards, advantageously produced during the manufacture of the cover 1 and receiving a continuous seal 10 for sealing against screw of the upper face 7 of the cylinder head 8.

De façon localisée, la paroi 3 présente plusieurs trous, d'axes respectifs verticaux. On a ainsi représenté un trou 11 destiné au remplissage du carter moteur (non représenté) en huile par l'intermédiaire du couvre-culasse ; ce trou 11 présente un axe vertical 14 transversale­ment auquel il présente une section circulaire, et il est bordé respecti­vement en dessous de la paroi 3 et au-dessus de celle-ci de rebords annulaires continus, respectivement 12 et 13, eux-mêmes annulaires de révolution autour de l'axe 14 ; le rebord 13 est destiné à recevoir un bouchon (non représenté) et présente à cet effet un filetage hélicoïdal partiel 15, qui est réalisé comme les deux rebords 12 et 13 en une seule pièce avec l'ensemble du couvercle 1. On a également représenté un trou 16 traversant de part en part la paroi 3 suivant un axe vertical 17, lequel trou 16 présente également transversalement à l'axe 17 une section circulaire et est bordé, respectivement en dessous et au-dessus de la paroi 3, de rebords périphériques continus 18, 19 annulaires de révolution autour de l'axe 17 ; vers ce dernier, le rebord 19 présente un bourrelet annulaire 20, de révolution autour de l'axe 17, destiné à retenir un bouchon (non représenté) par conjugaison de formes. Enfin, on a représenté un trou 21 traversant de part en part la paroi 3 suivant un axe vertical 22 et présentant transversalement à cet axe une section circulaire, avec des dimensions nettement inférieures à celles des trous 11 et 16 ; ce trou 21, occupant une position aussi centrale que possible par rapport à la périphérie 5 de la paroi 3, est destiné à recevoir coaxialement un organe de fixation du couvre-culasse sur la culasse 8 ; à titre d'un tel organe de fixation, on a schématisé à la figure 1 un goujon vertical 23 présentant une extrémité inférieure vissée dans la culasse 8, de façon non représentée, et une extrémité supérieure disposée au-dessus de la paroi 3, qu'il traverse suivant l'axe 22 par le trou 21 ; un écrou 24 vissé sur le goujon 23 s'appuie sur la paroi 3, par le dessus, par l'intermédiaire d'une rondelle d'étanchéité 25, cet exemple n'étant toutefois nullement limitatif.In a localized manner, the wall 3 has several holes, with respective vertical axes. There is thus shown a hole 11 intended for filling the crankcase (not shown) with oil via the cylinder head cover; this hole 11 has a vertical axis 14 transversely to which it has a circular section, and it is bordered respectively below the wall 3 and above the latter of continuous annular flanges, respectively 12 and 13, themselves annular of revolution around axis 14; the rim 13 is intended to receive a plug (not shown) and has for this purpose a partial helical thread 15, which is produced like the two rims 12 and 13 in one piece with the entire cover 1. Also shown a hole 16 passing right through the wall 3 along a vertical axis 17, which hole 16 also has transverse to the axis 17 a circular section and is bordered, respectively below and above the wall 3, by peripheral edges continuous 18, 19 annular of revolution about the axis 17; towards the latter, the rim 19 has an annular bead 20, of revolution around the axis 17, intended to retain a plug (not shown) by conjugation of shapes. Finally, there is shown a hole 21 passing right through the wall 3 along a vertical axis 22 and having transverse to this axis a circular section, with dimensions significantly smaller than those of holes 11 and 16; this hole 21, occupying a position as central as possible relative to the periphery 5 of the wall 3, is intended to receive coaxially a member for fixing the cylinder head cover to the cylinder head 8; as such a body of fixing, there is shown schematically in Figure 1 a vertical stud 23 having a lower end screwed into the cylinder head 8, not shown, and an upper end disposed above the wall 3, which it crosses along the axis 22 through hole 21; a nut 24 screwed onto the stud 23 rests on the wall 3, from above, by means of a sealing washer 25, this example however not being in any way limiting.

Vers le bas, outre les rebords respectifs 12 et 18 des trous 11 et 16, la paroi 3 présente en saillie des nervures ou autres reliefs 26 assurant un accolement vis-à-vis de la cloison intérieure 2 comme il apparaîtra plus loin, pour servir à la fois de moyens de positionnement précis de la cloison intérieure 2 à l'intérieur du couvercle 1, de moyens de rigidification du couvercle 1 d'une part de façon intrinsèque et d'autre part par appui sur la cloison intérieure 2, et enfin de cloisonnement d'une chambre de décantation d'huile 27 que délimitent entre eux le couvercle et la cloison intérieure 2, comme on le déduira aisément de la suite de la description.Downwards, in addition to the respective edges 12 and 18 of the holes 11 and 16, the wall 3 has projecting ribs or other reliefs 26 ensuring an abutment vis-à-vis the internal partition 2 as will appear below, to serve both precise positioning means of the interior partition 2 inside the cover 1, stiffening means of the cover 1 on the one hand intrinsically and on the other hand by pressing on the interior partition 2, and finally partitioning an oil decanting chamber 27 which delimit between them the cover and the inner partition 2, as will readily be deduced from the following description.

La cloison intérieure 2 comporte également une paroi 28 constituant sa partie supérieure et présentant une périphérie 29 le long de laquelle cette paroi porte, en une seule pièce avec elle, un rebord périphérique continu 30 tourné vers le bas.The internal partition 2 also comprises a wall 28 constituting its upper part and having a periphery 29 along which this wall carries, in one piece with it, a continuous peripheral rim 30 turned downwards.

La paroi 28 est située en dessous de la paroi 3, par rapport à laquelle elle occupe une position déterminée et dont elle est notamment maintenue écartée par appui contre les nervures d'accolement 26 de façon à délimiter la chambre 27 précitée. Elle est également maintenue écartée de la paroi 3 par appui, contre celle-ci, d'au moins un bossage localisé d'accolement 31 faisant partie intégrante de la cloison intérieure 2, étant entendu que d'autres bossages localisés peuvent également être prévus à cet effet dans la paroi 28 comme il ressortira de la suite de la description ; le bossage 31 borde dans l'exemple illustré un trou 32 traversant de part en part la paroi 28 suivant l'axe 14, lequel trou 32 présente transversalement à l'axe 14 une section circulaire telle qu'il s'adapte autour du rebord 12 du trou 11 autour de ce trou 32, par conséquent destiné comme le trou 11 au remplissage en huile du carter du moteur équipé du couvre-culasse, est bordé périphériquement d'une zone plate 33 du bossage 31, laquelle zone plate est perpendiculaire à l'axe 14 et s'appuie à plat contre une zone 34, également plate et perpendiculaire à l'axe 14, prévue dans la paroi 3 autour du rebord 12 ; la zone plate 34 est munie autour de ce rebord d'une gorge annulaire, continue 35 avantageusement réalisée lors de la fabrication de la paroi 3 en matière plastique et recevant un joint annulaire continu 36 d'étanchéification entre les parois 3 et 28 autour des trous coîncidant 11 et 32 ; les zones 33 et 34, la gorge 35 et le joint 36 présentent des formes respectives annulaires de révolution autour de l'axe 14. Un autre trou 37 est aménagé dans la paroi 28, coaxialement au trou 21 de la paroi 3 et directement en regard de celui-ci pour autoriser le passage du goujon 23 ou de tout autre organe de fixation approprié ; dans cette zone, les parois 3 et 28 sont également en appui mutuel, autour des trous 21 et 37 et à proximité immédiate de ces derniers, par un bossage localisé 50 de la paroi 28 permettant ainsi, par accolement localisé des parois 3 et 28, de reporter sur la paroi 28 les efforts de serrage appliqués à la paroi 3, autour du trou 21, par l'écrou 24 dans l'exemple illustré, ou par tout autre composant analogue des organes de fixation du couvre-culasse sur la culasse 8 ; de préférence, comme autour des trous 11 et 32, l'appui mutuel de la paroi 3 et du bossage localisé 50 de la paroi 28 autour des trous 21 et 37 s'effectue par des zones respectives 51, 52, plates et perpendiculaires à l'axe 22, que la paroi 3 et le bossage 50 présentent respectivement autour du trou 21 et autour du trou 37 ; ces zones 51 et 52, par exemple annulaires de révolution autour de l'axe 22, sont étanchéifiées mutuelle­ment par exemple au moyen d'un joint annulaire continu 53, de révolution autour de l'axe 22, engagé dans une gorge 49 également annulaire, continue et de révolution autour de l'axe 22, aménagée autour du trou 21 dans la paroi 3 lors de la fabrication de cette dernière. Dans la mesure où, généralement, plusieurs organes de fixation du couvre-culasse sur la culasse 8 sont nécessaires, de façon répartie dans une zone centrale du couvre­culasse, on retrouve à plusieurs exemplaires des trous associés tels que les trous 21 et 37, et les dispositions qui viennent d'être décrites à leur propos, assurant un accolement mutuel et une étanchéification mutuelle des parois 3 et 28 autour de ces trous.The wall 28 is located below the wall 3, with respect to which it occupies a determined position and of which it is in particular kept apart by pressing against the joining ribs 26 so as to delimit the aforementioned chamber 27. It is also kept spaced from the wall 3 by pressing, against the latter, at least one localized projection boss 31 forming an integral part of the internal partition 2, it being understood that other localized bosses can also be provided at this effect in the wall 28 as will emerge from the following description; the boss 31 borders in the example illustrated a hole 32 passing right through the wall 28 along the axis 14, which hole 32 has transverse to the axis 14 a circular section such that it fits around the rim 12 of the hole 11 around this hole 32, consequently intended like the hole 11 for filling the crankcase with engine oil fitted with the cylinder head cover, is bordered peripherally by a flat area 33 of the boss 31, which flat area is perpendicular to the axis 14 and leans flat against an area 34, also flat and perpendicular to the axis 14, provided in the wall 3 around the rim 12; the flat area 34 is provided around this rim with an annular, continuous groove 35 advantageously produced during the manufacture of the wall 3 of plastic material and receiving a continuous annular seal 36 for sealing between the walls 3 and 28 around the holes coinciding 11 and 32; zones 33 and 34, the groove 35 and the seal 36 have respective annular shapes of revolution about the axis 14. Another hole 37 is arranged in the wall 28, coaxially with the hole 21 of the wall 3 and directly opposite of it to allow the passage of the stud 23 or any other suitable fixing member; in this zone, the walls 3 and 28 are also in mutual support, around the holes 21 and 37 and in the immediate vicinity of the latter, by a localized boss 50 of the wall 28 thus allowing, by localized joining of the walls 3 and 28, to transfer onto the wall 28 the tightening forces applied to the wall 3, around the hole 21, by the nut 24 in the example illustrated, or by any other similar component of the elements for fixing the cylinder head cover to the cylinder head 8 ; preferably, as around the holes 11 and 32, the mutual support of the wall 3 and the localized boss 50 of the wall 28 around the holes 21 and 37 is effected by respective zones 51, 52, flat and perpendicular to the axis 22, which the wall 3 and the boss 50 have respectively around the hole 21 and around the hole 37; these zones 51 and 52, for example annular of revolution around the axis 22, are sealed together for example by means of a continuous annular seal 53, of revolution around the axis 22, engaged in a groove 49 also annular, continuous and of revolution around the axis 22, arranged around the hole 21 in the wall 3 during the manufacture of the latter. Insofar as, generally, several members for fixing the cylinder head cover to the cylinder head 8 are necessary, in a distributed manner in a central area of the cylinder head cover, there are several copies of associated holes such as holes 21 and 37, and the arrangements which have just been described in connection therewith, ensuring mutual joining and mutual sealing of the walls 3 and 28 around these holes.

Le rebord 30 présente quant à lui dans l'exemple illustré deux zones à raison d'une zone supérieure 38 directement adjacente à la périphérie 29 de la paroi 28 et d'une zone inférieure 39 qui se raccorde à la zone supérieure 38 par un épaulement 40 et présente vers le bas un bord libre continu 41, plan, situé à proximité immédiate du bord libre 6 de la jupe 4 en ce sens que, bien qu'étant situé au-dessus de ce bord 6, il en est distant verticalement d'une distance largement inférieure aux dimensions séparant verticalement ce bord 41 de la paroi 28 ou le bord 6 de la paroi 3 ; le bord 41 est parallèle au bord 6, c'est-à-dire horizontal dans l'orientation illustrée à titre d'exemple non limitatif aux figures.The rim 30 has meanwhile in the example illustrated two zones due to an upper zone 38 directly adjacent to the periphery 29 of the wall 28 and a lower zone 39 which is connected to the upper zone 38 by a shoulder 40 and presents downward a continuous free edge 41, plane, located in the immediate vicinity of the free edge 6 of the skirt 4 in the sense that, although being located above this edge 6, it is vertically distant from it by a distance much smaller than the dimensions vertically separating this edge 41 of the wall 28 or the edge 6 of the wall 3; the edge 41 is parallel to the edge 6, that is to say horizontal in the orientation illustrated by way of nonlimiting example in the figures.

Le rebord 30 est ainsi placé en regard de la jupe 4, à l'intérieur du couvercle 1 sa zone supérieure 38 est placée en regard d'une première partie 42 de la jupe 4, laquelle première partie est directement adjacente de la périphérie 5 de la paroi 3, et la zone supérieure 38 du rebord 30 est écartée de cette première partie 42 de façon à définir avec cette dernière, comme la paroi 28 avec la paroi 3, la chambre 27 de décantation d'huile. L'épaulement 40 constitue, dans le rebord 30 et par rapport à la zone supérieure 38 de celui-ci, un infléchissement vers la jupe 4 et sous cet épaulement 40, la zone inférieure 39 du rebord 30 épouse étroitement une deuxième partie 43 de la jupe 4, à savoir la partie de cette jupe 4 qui s'étend du niveau de l'épaulement 40 jusqu'au niveau du bord inférieur 41 du rebord 30.The rim 30 is thus placed opposite the skirt 4, inside the cover 1 its upper zone 38 is placed opposite a first part 42 of the skirt 4, which first part is directly adjacent to the periphery 5 of the wall 3, and the upper zone 38 of the rim 30 is separated from this first part 42 so as to define with the latter, like the wall 28 with the wall 3, the chamber 27 for decanting oil. The shoulder 40 constitutes, in the rim 30 and with respect to the upper zone 38 thereof, a deflection towards the skirt 4 and under this shoulder 40, the lower zone 39 of the rim 30 closely follows a second part 43 of the skirt 4, namely the part of this skirt 4 which extends from the level of the shoulder 40 to the level of the lower edge 41 of the rim 30.

On remarquera que, notamment pour des raisons de fabrica­tion, la jupe 4 comme le rebord 30 s'évasent légèrement vers le bas, bien que présentant une orientation proche d'une orientation verticale. si bien que, par la zone inférieure 39 de son rebord 30, la cloison intérieure 2 s'emboîte étroitement dans le couvercle 1, par la partie 43 de la jupe 4 de celui-ci, à la façon d'un emmanchement conique.It will be noted that, in particular for manufacturing reasons, the skirt 4 like the rim 30 widens slightly downwards, although having an orientation close to a vertical orientation. so that, by the lower zone 39 of its rim 30, the internal partition 2 fits tightly into the cover 1, through the part 43 of the skirt 4 thereof, in the manner of a conical fitting.

Immédiatement en dessous du bord 41 du rebord 30, le couvercle 1 présente. en une seule pièce issue de sa fabrication, une pluralité d'ergots 44 qui forment une saillie vers l'intérieur du couvercle 1 par rapport à un prolongement 45 de la deuxième partie 43 de la jupe 4 jusqu'au bord 6 de celle-ci. Chacun de ces ergots 44 présente vers le haut une face supérieure plane 46 horizontale ou sensiblement horizontale dans l'exemple illustré, c'est-à-dire parallèle au bord 6 mais tournée en sens opposé par rapport à celui-ci. laquelle face 46 sert d'appui au bord 41 de la cloison intérieure 2 vers le bas par rapport au couvercle 1. c'est-à-dire dans un sens 47 correspondant à un sens d'extraction de la cloison intérieure 2 hors du couvercle 1 ; par contre, en dessous de cette face 46 et jusqu'au bord 6 de la jupe, chaque ergot présente vers l'intérieur du couvercle 1 une face 48, par exemple plane, raccordant la face 46 au prolongement 45 de la partie 43 de la jupe 4 et donnant ainsi à chaque ergot 44 la forme d'un coin formant une saillie progressivement de plus en plus importante, par rapport au prolongement précité 45, de bas en haut.Immediately below the edge 41 of the rim 30, the cover 1 has. in a single piece after its manufacture, a plurality of lugs 44 which form an inward projection of the cover 1 relative to an extension 45 of the second part 43 of the skirt 4 to the edge 6 thereof . Each of these lugs 44 has upward a flat upper face 46 horizontal or substantially horizontal in the example illustrated, that is to say parallel to the edge 6 but turned in the opposite direction relative to the latter. which face 46 serves to support the edge 41 of the internal partition 2 downwards with respect to the cover 1. that is to say in a direction 47 corresponding to a direction of extraction of the internal partition 2 from the cover 1; on the other hand, below this face 46 and up to the edge 6 of the skirt, each lug has towards the inside of the cover 1 a face 48, for example planar, connecting the face 46 to the extension 45 of the part 43 of the skirt 4 and thus giving each lug 44 the shape of a wedge forming a progressively greater and greater projection, relative to the above-mentioned extension 45, from bottom to top.

Dans ces conditions, le couvre-culasse qui vient d'être décrit peut être fabriqué de la façon suivante.Under these conditions, the cylinder head cover which has just been described can be manufactured in the following manner.

On commence par fabriquer par des moyens appropriés le couvercle 1 et la jupe 2, initialement séparés mais tels qu'ils viennent d'être décrits.We start by manufacturing by appropriate means the cover 1 and the skirt 2, initially separated but as they have just been described.

Ensuite, on insère dans la gorge 35 le joint d'étanchéité 36, de même que l'on insère dans les différentes gorges 49 bordant les trous 21 de la paroi 3 les joints d'étanchéité 53 respectivement correspondants, puis on présente la cloison intérieure 2, par sa paroi 28, en regard du couvercle 1, par le bord libre 6 de celui-ci. Ensuite, par un mouvement correspondant à un rapprochement mutuel des parois 3 et 21, on insère la cloison intérieure 2 dans le couvercle 1, ce qui provoque au passage de la zone inférieure 39 du rebord 30 en regard des faces 48 des ergots 44, formant faces de came, une déformation élastique progressive du rebord 30 et/ou de la partie 43 de la jupe 4 et du prolongement 45 de cette partie 43. Ce mouvement se poursuit jusqu'à ce que les parois 3 et 28 viennent en butée mutuelle, à l'encontre d'un rapprochement relatif, par l'intermédiaire des moyens d'accolement constitués par les nervures 26, le bossage 31 et les bossages 50, ce qui correspond à une mise en compression des joints 36 et 53 entre les parois 3 et 28, c'est-à-dire à une étanchéification mutuelle de ces parois autour des trous 11 et 32, ainsi qu'autour des trous 21 et 37 ; on remarquera que le rebord 18 du trou 16 reste quant à lui écarté de la paroi 28 ; cette mise en butée mutuelle des parois 28 et 3 s'effectue en pratique pour un positionnement relatif du couvercle 1 et de la cloison intérieure 2 tel que le bord 41 du rebord 30 coïncide avec les faces 46 des ergots 44, si bien que le rebord 30 et la jupe 4 reprennent élastiquement la forme qu'ils avaient quittée sous l'action du contact des faces 48 des ergots 44 avec la zone inférieure 39 du rebord 30, et que le bord 41 s'encliquette par les faces 46 vis-à-vis des ergots 44 ; la cloison intérieure 2 est alors immobilisée par rapport au couvercle 1 dans la position illustrée aux figures.Next, the seal 36 is inserted into the groove 35, just as the different grooves 49 bordering the holes 21 in the wall 3 are inserted, respectively the corresponding seals 53, then the interior partition is presented. 2, by its wall 28, facing the cover 1, by the free edge 6 thereof. Then, by a movement corresponding to a mutual approximation of the walls 3 and 21, the internal partition 2 is inserted into the cover 1, which causes the passage of the lower zone 39 of the rim 30 opposite the faces 48 of the lugs 44, forming cam faces, a progressive elastic deformation of the rim 30 and / or of the part 43 of the skirt 4 and of the extension 45 of this part 43. This movement continues until the walls 3 and 28 come into mutual abutment, against a relative approximation, by means of the joining means constituted by the ribs 26, the boss 31 and the bosses 50, which corresponds to a compression of the seals 36 and 53 between the walls 3 and 28, that is to say a mutual sealing of these walls around the holes 11 and 32, as well as around the holes 21 and 37; it will be noted that the rim 18 of the hole 16 remains spaced from the wall 28; this mutual abutment of the walls 28 and 3 is carried out in practical for a relative positioning of the cover 1 and the interior partition 2 such that the edge 41 of the rim 30 coincides with the faces 46 of the lugs 44, so that the rim 30 and the skirt 4 resiliently resume the shape they had left under the action of the contact of the faces 48 of the lugs 44 with the lower zone 39 of the rim 30, and that the edge 41 snaps into place through the faces 46 with respect to the lugs 44; the interior partition 2 is then immobilized relative to the cover 1 in the position illustrated in the figures.

Naturellement, d'autres modes de solidarisation mutuelle du couvercle l et de la cloison intérieure 2 pourraient être choisis sans que l'on sorte pour autant du cadre de la présente invention ; on remarquera cependant qu'un encliquetage élastique mutuel est un moyen particuliè­rement simple d'assurer cette solidarisation mutuelle.Naturally, other modes of mutual securing of the cover 1 and the internal partition 2 could be chosen without departing from the scope of the present invention; it will however be noted that mutual elastic snap-fastening is a particularly simple means of ensuring this mutual joining.

On remarque également que lorsque, ultérieurement, on monte le couvre-culasse ainsi réalisé sur une culasse 8, c'est-à-dire en pratique que l'on met en compression le joint 10 entre le bord libre 6 de la jupe 4 et la face supérieure 7 de la culasse 8 en agissant sur les écrous 24 ou moyens analogues, les efforts appliqués par ces écrous 24 ou moyens analogues sur la paroi 3, vers la face supérieure 7 de la culasse 8, se transmettent sans déformation de cette paroi 3 à la paroi 28, par les bossages 50 ; la paroi 28 elle-même retransmet par la zone inférieure 39 de son rebord 30 ces efforts à la transition entre la partie 43 de la jupe 4 et lle prolongement 45 de cette partie 43, c'est-à-dire à proximité du joint 10 et dans une zone dans laquelle la jupe 4 est pratiquement parallèle au sens de ces efforts (qui est le sens 47 indiqué plus haut) et se trouve en outre rigidifiée par la zone inférieure 39 du rebord 30, si bien qu'il en résulte l'application au joint 10 d'une pression à peu près uniformément répartie et l'absence de risque de déformation de la jupe 4 notamment au niveau de son bord 6.It is also noted that when, subsequently, the cylinder head cover thus produced is mounted on a cylinder head 8, that is to say in practice that the seal 10 is put in compression between the free edge 6 of the skirt 4 and the upper face 7 of the cylinder head 8 by acting on the nuts 24 or similar means, the forces applied by these nuts 24 or similar means on the wall 3, towards the upper face 7 of the cylinder head 8, are transmitted without deformation of this wall 3 to the wall 28, by the bosses 50; the wall 28 itself retransmits through the lower zone 39 of its rim 30 these forces at the transition between the part 43 of the skirt 4 and the extension 45 of this part 43, that is to say near the joint 10 and in an area in which the skirt 4 is practically parallel to the direction of these forces (which is the direction 47 indicated above) and is further rigidified by the lower area 39 of the rim 30, so that it results therefrom applying approximately uniformly distributed pressure to the joint 10 and the absence of risk of deformation of the skirt 4, in particular at its edge 6.

On remarquera que, bien que l'on ait décrit les ergots 44 comme directement adjacents au bord libre 6, ces ergots pourraient être situés à un niveau différent, légèrement écarté du bord libre 6, sur la partie 43 de la jupe 4, dès lors cependant que celle-ci présenterait entre leur niveau et celui de son bord 6 une orientation approximativement parallèle au sens 47 et approximativement perpendiculaire au bord 6 et que le rebord 30 épouserait étroitement la partie 43 de la jupe 4 au moins à proximité immédiate de leur niveau, c'est-à-dire du niveau de son bord inférieur 41.It will be noted that, although the lugs 44 have been described as directly adjacent to the free edge 6, these lugs could be located at a different level, slightly spaced from the free edge 6, on the part 43 of the skirt 4, therefore however that this would present between their level and that of its edge 6 an orientation approximately parallel to the direction 47 and approximately perpendicular to the edge 6 and that the rim 30 would closely match the part 43 of the skirt 4 at least in close proximity to their level , that is to say the level of its lower edge 41.

De même, bien que l'on ait décrit les moyens d'accolement sous forme de bossages localisés de la paroi 28 autour des trous 11 et 37 de celle-ci et sous forme de nervures ou autres reliefs 26 de la paroi 3 par ailleurs, on ne sortirait pas du cadre de l'invention en choisissant à ce titre d'autres dispositions.Similarly, although the joining means have been described in the form of localized bosses of the wall 28 around the holes 11 and 37 thereof and in the form of ribs or other reliefs 26 of the wall 3 moreover, it would not go beyond the scope of the invention to choose other provisions as such.

Naturellement, outre les pièces constituant respectivement le couvercle 1 et la cloison intérieure 2, un couvre-culasse conforme à la présente invention peut comporter d'autres pièces constitutives, rapportées sur l'une ou l'autre des pièces 1 et 2 par tout moyen approprié, notamment lié à la nature du matériau constitutif de ces pièces. A titre de simple illustration, non limitative, de ces possibilités, on a illustré aux figures la fixation, par exemple par soudure, emmanchement, sertissage, sur la cloison intérieure 2, d'une tôle séparatrice 54 s'insérant localement dans la chambre 27 de décantation d'huile et d'un reniflard 55 débouchant dans cette chambre par la paroi 28, d'une part, et à l'intérieur de la cloison intérieure 2, en dessous de cette paroi 28, d'autre part ; on a par ailleurs illustré le montage par clipsage, sur la jupe 4 du couvercle 1, d'un capot localisé 56 destiné à dissimuler des câbles 57 en complétant esthétiquement le couvercle 1, ce capot localisé 56 avantageusement réalisé en matière plastique pouvant également être fixé par d'autres moyens sur le couvercle 1.Naturally, in addition to the parts respectively constituting the cover 1 and the internal partition 2, a cylinder head cover according to the present invention may include other constituent parts, attached to one or the other of the parts 1 and 2 by any means. appropriate, in particular related to the nature of the material of which these parts are made. By way of simple illustration, without limitation, of these possibilities, the figures illustrate the fixing, for example by welding, fitting, crimping, on the internal partition 2, of a separating plate 54 inserted locally in the chamber 27 decanting oil and a breather 55 opening into this chamber through the wall 28, on the one hand, and inside the interior partition 2, below this wall 28, on the other hand; the mounting by clipping, on the skirt 4 of the cover 1, has also been illustrated of a localized cover 56 intended to conceal cables 57 by aesthetically completing the cover 1, this localized cover 56 advantageously made of plastic material which can also be fixed by other means on the cover 1.

Un Homme du métier comprendra aisément que le mode de mise en oeuvre de l'invention qui vient d'être décrit ne constitue qu'un exemple non limitatif, par rapport auquel on pourra prévoir de nombreuses variantes sans sortir pour autant du cadre de la présente invention.A person skilled in the art will readily understand that the mode of implementation of the invention which has just been described constitutes only a non-limiting example, with respect to which many variants can be provided without departing from the scope of this document. invention.

Claims (26)

1. Procédé de fabrication d'un couvre-culasse à décanteur d'huile, comportant une première paroi (3) présentant une périphérie (5), une jupe (4) bordant ladite première paroi (3) à sa périphérie (5) et présentant un bord libre (6) destiné à venir en contact étanche avec une culasse (8), ledit bord libre (6) étant espacé de ladite première paroi (3), et une deuxième paroi (28) située entre ladite première paroi (3) et ledit bord libre (6) et généralement espacée de ladite première paroi (28) et dudit bord libre (6), pour délimiter une chambre (27) de décantation d'huile avec ladite première paroi (3) et une première partie (42) de ladite jupe (41), ladite première partie (42) étant adjacente à ladite première paroi (3), par solidarisation mutuelle de deux pièces mutuellement emboîtées dont l'une (1) constitue ladite première paroi (3) et ladite jupe (4) et dont l'autre (2) constitue ladite deuxième paroi (26),
caractérisé par la succession des étapes consistant a : a) réaliser d'une part une première pièce (1) en matière plastique réunissant ladite première paroi (3) et ladite jupe (4) et d'autre part une deuxième pièce métallique (2) réunissant ladite deuxième paroi (26) et un rebord (30) propre à épouser jusqu'à proximité immédiate dudit bord libre (6) une deuxième partie (43) de ladite jupe (40), à l'intérieur de ladite première pièce (1) en matière plastique, ladite deuxième partie (43) étant située entre ladite première partie (42) de ladite jupe et ledit bord libre, et b) emboîter ladite deuxième pièce (2) métallique dans ladite première pièce (1) en matière plastique de telle sorte que ledit rebord (30) épouse jusqu'à proximité immédiate dudit bord libre (6) ladite deuxième partie (43) de ladite jupe (4), à l'intérieur de ladite première pièce (1) en matière plastique, et solidariser mutuellement lesdites première et deuxième pièces (1, 2) respectivement en matière plastique et métallique. 1. A method of manufacturing an oil decanter cylinder head cover, comprising a first wall (3) having a periphery (5), a skirt (4) bordering said first wall (3) at its periphery (5) and having a free edge (6) intended to come into tight contact with a cylinder head (8), said free edge (6) being spaced from said first wall (3), and a second wall (28) located between said first wall (3 ) and said free edge (6) and generally spaced from said first wall (28) and said free edge (6), to delimit a chamber (27) for decanting oil with said first wall (3) and a first part ( 42) of said skirt (41), said first part (42) being adjacent to said first wall (3), by mutual securing of two mutually nested parts, one of which (1) constitutes said first wall (3) and said skirt (4) and the other (2) of which constitutes said second wall (26),
characterized by the succession of steps consisting in: a) produce on the one hand a first piece (1) of plastic material joining said first wall (3) and said skirt (4) and on the other hand a second metal piece (2) joining said second wall (26) and a rim (30) suitable for marrying, in the immediate vicinity of said free edge (6), a second part (43) of said skirt (40), inside said first part (1) made of plastic, said second part ( 43) being located between said first part (42) of said skirt and said free edge, and b) fitting said second piece (2) of metal into said first piece (1) of plastic material so that said flange (30) conforms immediately to said free edge (6) said second part (43) of said skirt (4), inside said first part (1) of plastic material, and mutually securing said first and second parts (1, 2) respectively of plastic and metallic material. 2. Procédé selon la revendication 1, caractérisé en ce que, lors de l'étape a, on réalise ladite première pièce (1) en une matière plastique choisie dans un groupe comportant les matières plastiques thermoplastiques et les matières plastiques thermodurcissables.2. Method according to claim 1, characterized in that, during step a, said first part (1) is made of a plastic material chosen from a group comprising thermoplastic plastics and thermosetting plastics. 3. Procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce que, lors de l'étape a, on réalise ladite deuxième pièce (2) par emboutissage d'un flan métallique.3. Method according to any one of claims 1 and 2, characterized in that, during step a, said second part (2) is produced by stamping a metal blank. 4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que, lors de l'étape a, on prévoit des moyens (41, 44) d'encliquetage mutuel dudit rebord (30) et de ladite deuxième partie (43) de ladite jupe (4).4. Method according to any one of claims 1 to 3, characterized in that, during step a, there are provided means (41, 44) for mutual locking of said flange (30) and said second part ( 43) of said skirt (4). 5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que, lors de l'étape a ou b, on prévoit des moyens d'accolement (26, 31, 50) qui s'interposent entre lesdites première et deuxième parois (3, 28) lors de l'étape b, pour s'opposer à un rapproche­ment mutuel de ces dernières à partir d'une position relative déterminée.5. Method according to any one of claims 1 to 4, characterized in that, during step a or b, there are provided joining means (26, 31, 50) which are interposed between said first and second walls (3, 28) during step b, to oppose a mutual approach of the latter from a determined relative position. 6. Procédé selon les revendication 4 et 5 en combinaison, caractérisé en ce que :
- lors de l'étape a, on prévoit, au titre desdits moyens (41, 44) d'encliquetage mutuel, des ergots (44) solidaires de ladite deuxième partie (43) de ladite jupe (4), à proximité immédiate dudit bord libre (6), lesdits ergots (44) étant propres à servir d'appui audit rebord (41) dans un sens (47) correspondant à un éloignement mutuel desdites première et deuxième parois (3, 28), dans ladite position relative déterminée,
- lors de l'étape b, on emboîte ladite deuxième pièce (2) dans ladite première pièce (1), avec déformation élastique dudit rebord (30) et/ou de ladite jupe (4) du passage desdits ergots (44) et jusqu 'à ce que lesdites première et deuxième parois (3, 28) viennent en butée mutuelle par l'intermédiaire desdits moyens d'accolement (26, 31, 50), et l'on fait cesser alors ladite déformation élastique pour placer ledit rebord (41) en appui sur lesdits ergots (44) dans un sens (47) correspondant à un éloignement mutuel desdites première et deuxième parois (3, 28).6. Method according to claims 4 and 5 in combination, characterized in that:
- During step a, provision is made, under said means (41, 44) for mutual snap-fitting, lugs (44) integral with said second part (43) of said skirt (4), in the immediate vicinity of said edge free (6), said pins (44) being suitable for serving as a support for said flange (41) in a direction (47) corresponding to a mutual separation of said first and second walls (3, 28), in said determined relative position,
- During step b, said second part (2) is fitted into said first part (1), with elastic deformation of said flange (30) and / or of said skirt (4) from the passage of said lugs (44) and up to 'in that said first and second walls (3, 28) come into mutual abutment via said joining means (26, 31, 50), and said elastic deformation is then stopped to place said flange ( 41) resting on said pins (44) in a direction (47) corresponding to a mutual separation of said first and second walls (3, 28). 7. Procédé selon la revendication 6, caractérisé en ce que l'on réalise lesdits ergots (44) sous forme de parties intégrantes de ladite première pièce (1) lors de l'étape a.7. Method according to claim 6, characterized in that said lugs (44) are produced in the form of integral parts of said first part (1) during step a. 8. Procédé selon l'une quelconque des revendications 5 à 7, caractérisé en ce que l'on prévoit, notamment à titre de moyens (21, 37) de réception d'organes (23, 24, 25) de fixation du couvre-culasse sur une culasse (8) ou à titre de moyens (11) de remplissage en huile, au moins deux trous (11, 21, 32, 37) aménagés respectivement dans ladite première paroi (3) et dans ladite deuxième paroi (28) et destinés à se faire face dans le couvre-culasse et en ce que, lors de l'étape a ou b, on prévoit à proximité immédiate desdits trous (11, 21, 32, 37) au moins certains desdits moyens d'accolement (26, 31, 50)8. Method according to any one of claims 5 to 7, characterized in that provision is made, in particular as means (21, 37) for receiving members (23, 24, 25) for fixing the cover. cylinder head on a cylinder head (8) or as means (11) for filling with oil, at least two holes (11, 21, 32, 37) arranged respectively in said first wall (3) and in said second wall (28) and intended to face each other in the cylinder head cover and in that, during step a or b, there are provided in the immediate vicinity of said holes (11, 21, 32, 37) at least some of said attachment means ( 26, 31, 50) 9. Procédé selon la revendication 8, caractérisé en ce que, lors de l'étape a ou b, on prévoit sur l'une (3) au moins desdites première et deuxième parois (3, 28), autour dudit trou (11, 32) correspondant, des moyens (36, 53) d'étanchéification vis-à-vis de l'autre (28) desdites première et deuxième parois (3, 28), avec laquelle lesdits moyens d'étanchéification (36, 53) viennent en contact d'étanchéification lors de l'étape b.9. Method according to claim 8, characterized in that, during step a or b, at least one of said first and second walls (3, 28) is provided on at least one (3), around said hole (11, 32) corresponding, sealing means (36, 53) with respect to the other (28) of said first and second walls (3, 28), with which said sealing means (36, 53) come in sealing contact during step b. 10. Procédé selon la revendication 9, caractérisé en ce que l'on aménage sur ladite première paroi (3), autour dudit trou correspondant (11, 21), une gorge annulaire (35, 49) de réception d'un joint annulaire d'étanchéité (36, 53), en ce que l'on dispose ensuite dans ladite gorge (35, 49) un joint annulaire d'étanchéité (36, 53) qui vient en appui sur ladite deuxième paroi (28) autour dudit trou correspondant (32, 37) lors de l'étape b.10. The method of claim 9, characterized in that there is arranged on said first wall (3), around said corresponding hole (11, 21), an annular groove (35, 49) for receiving an annular seal d seal (36, 53), in that there is then arranged in said groove (35, 49) an annular seal (36, 53) which bears on said second wall (28) around said corresponding hole (32, 37) during step b. 11. Procédé selon l'une quelconque des revendications 5 à 10, caractérisé en ce que l'on réalise lesdits moyens d'accolement (26) comme parties intégrantes de ladite première pièce (1) lors de l'étape a.11. Method according to any one of claims 5 to 10, characterized in that said joining means (26) are produced as integral parts of said first part (1) during step a. 12. Procédé selon l'une quelconque des revendications 5 à 11, caractérisé en ce que l'on réalise lesdits moyens d'accolement (31, 50) comme parties intégrantes de ladite deuxième pièce (2) lors de l'étape a.12. Method according to any one of claims 5 to 11, characterized in that said joining means (31, 50) are produced as integral parts of said second part (2) during step a. 13. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que l'on aménage dans ledit bord libre (6) une gorge (9) de réception d'un joint (10) d'étanchéité vis-à-vis d'une culasse (8).13. Method according to any one of claims 1 to 12, characterized in that there is provided in said free edge (6) a groove (9) for receiving a seal (10) vis-à-vis screw of a cylinder head (8). 14. Couvre-culasse à décanteur d'huile, comportant deux pièces (1, 2) mutuellement emboîtées et mutuellement solidaires, dont l'une (1) constitue d'une part une première paroi (3) présentant une périphérie (5) et d'autre part une jupe (4) bordant ladite première paroi (3) à sa périphérie (5) et présentant un bord libre (6) destiné à venir en contact étanche avec une culasse (8), ledit bord libre (6) étant espacé de ladite première paroi (3), et dont l'autre (2) constitue une deuxième paroi (28) située entre ladite première paroi (3) et ledit bord libre (6) et générale­ment espacée de ladite première paroi (3) et dudit bord libre (6), pour délimiter une chambre (27) de décantation d'huile avec ladite première paroi (3) et une première partie (42) de ladite jupe (4), ladite première partie (42) étant adjacente à ladite première paroi (3),
caractérisé en ce que ladite première paroi (3) et ladite jupe (4) sont constituées en une seule première pièce (1) en matière plastique et en ce que ladite deuxième paroi (28) est constituée en une seule deuxième pièce métallique (2) avec un rebord (30) épousant jusqu'à proximité immédiate dudit bord libre (6) une deuxième partie (43) de ladite jupe (4), à l'intérieur de ladite première pièce (1) en matière plastique, ladite deuxième partie (43) étant située entre ladite deuxième paroi (28) et ledit bord libre (6), et en ce que sont prévus des moyens (41, 44) de solidarisation mutuelle desdites première et deuxième pièces (1, 2) respectivement en matière plastique et métallique.14. Cylinder head cover with oil separator, comprising two mutually interlocking and mutually integral parts (1, 2), one of which (1) constitutes on the one hand a first wall (3) having a periphery (5) and on the other hand a skirt (4) bordering said first wall (3) at its periphery (5) and having a free edge (6) intended to come into sealing contact with a cylinder head (8), said free edge (6) being spaced from said first wall (3), and the other (2) of which constitutes a second wall (28) situated between said first wall (3) and said free edge (6) and generally spaced from said first wall (3) and of said free edge (6), to delimit an oil settling chamber (27) with said first wall (3) and a first part (42) of said skirt (4), said first part (42) being adjacent to said first wall (3),
characterized in that said first wall (3) and said skirt (4) are made in a single first piece (1) of plastic material and in that said second wall (28) is made in a single second metal piece (2) with a flange (30) conforming, in the immediate vicinity of said free edge (6), to a second part (43) of said skirt (4), inside said first part (1) made of plastic, said second part ( 43) being located between said second wall (28) and said free edge (6), and in that means (41, 44) are provided for mutual securing of said first and second parts (1, 2) respectively of plastic material and metallic. 15. Couvre-culasse selon la revendication 14, caractérisé en ce que ladite première pièce (1) est en une matière plastique choisie dans un groupe comportant les matières plastiques thermoplastiques et les matières plastiques thermodurcissables.15. Cylinder head cover according to claim 14, characterized in that said first part (1) is made of a plastic material chosen from a group comprising thermoplastic plastics and thermosetting plastics. 16. Couvre-culasse selon l'une quelconque des revendications 14 et 15, caractérisé en ce que ladite deuxième pièce (2) est en tôle métallique emboutie.16. Cylinder head cover according to any one of claims 14 and 15, characterized in that said second part (2) is made of stamped metal sheet. 17. Couvre-culasse selon l'une quelconque des revendications 14 à 16, caractérisé en ce que les moyens (41, 44) de solidarisation mutuelle desdites première et deuxième pièces (1, 2) comportent des moyens (41, 44) d'encliquetage mutuel dudit rebord (30) et de ladite deuxième partie (43) de ladite jupe (4).17. Cylinder head cover according to any one of claims 14 to 16, characterized in that the means (41, 44) for securing each other of said first and second parts (1, 2) comprise means (41, 44) for mutual snapping of said flange (30) and said second part (43) of said skirt (4). 18. Couvre-culasse selon l'une quelconque des revendications 14 à 17, caractérisé en ce qu'il comporte des moyens d'accolement (26, 31, 50) interposés dans ladite chambre (27) entre lesdites première et deuxième parois (3, 28) et s'opposant à un rapprochement mutuel de ces dernières.18. Cylinder head cover according to any one of claims 14 to 17, characterized in that it comprises joining means (26, 31, 50) interposed in said chamber (27) between said first and second walls (3 , 28) and opposing a mutual rapprochement of the latter. 19. Couvre-culasse selon les revendications 17 et 18 en combinaison, caractérisé en ce que lesdits moyens d'encliquetage mutuel comportent des ergots (44) solidaires de ladite deuxième partie (43) de ladite jupe (4), à proximité immédiate dudit bord libre (6), et sur lesquels ledit rebord (30) s'appuie dans un sens (47) correspondant à un éloignement mutuel desdites première et deuxième parois (3, 28).19. Cylinder head cover according to claims 17 and 18 in combination, characterized in that said mutual latching means comprise lugs (44) integral with said second part (43) of said skirt (4), in close proximity to said edge free (6), and on which said flange (30) is supported in a direction (47) corresponding to a mutual separation of said first and second walls (3, 28). 20. Couvre-culasse selon la revendication 19, caractérisé en ce que les ergots (44) font partie intégrante de ladite première pièce (1).20. Cylinder head cover according to claim 19, characterized in that the lugs (44) are an integral part of said first part (1). 21. Couvre-culasse selon l'une quelconque des revendications 18 à 20, caractérisé en ce qu'il comporte, notamment à titre de moyens (21, 37) de réception d'organes (23, 24, 25) de fixation du couvre-culasse sur une culasse (8) ou de moyens (11, 32) de remplissage en huile d'un moteur associé, au moins deux trous (11, 21, 32, 37) aménagés en regard l'un de l'autre respectivement dans ladite première paroi (3) et dans ladite deuxième paroi (28), et en ce qu'au moins certains desdits moyens d'accolement (26, 31, 50) sont disposés à proximité immédiate desdits trous (11, 21, 32, 37).21. Cylinder head cover according to any one of claims 18 to 20, characterized in that it comprises, in particular as means (21, 37) for receiving members (23, 24, 25) for fixing the cover - cylinder head on a cylinder head (8) or means (11, 32) for filling the oil of an associated engine, at least two holes (11, 21, 32, 37) arranged facing each other respectively in said first wall (3) and in said second wall (28), and in that at least some of said joining means (26, 31, 50) are arranged in the immediate vicinity of said holes (11, 21, 32, 37). 22. Couvre-culasse selon la revendication 21, caractérisé en ce qu'il comporte des moyens (36, 53) d'étanchéification mutuelle desdites parois (3, 28) autour desdits trous (11, 21, 32, 37).22. Cylinder head cover according to claim 21, characterized in that it comprises means (36, 53) for mutual sealing of said walls (3, 28) around said holes (11, 21, 32, 37). 23. Couvre-culasse selon la revendication 22, caractérisé en ce que lesdits moyens (36, 53) d'étanchéification mutuelle comportent une gorge annulaire (35, 49) aménagée dans ladite première paroi (3), autour dudit trou de remplissage correspondant (11, 32), et un joint annulaire d'étanchéité (36, 53) engagé dans ladite gorge annulaire (35, 49) et prenant appui sur ladite deuxième paroi (28) autour dudit trou correspondant (11, 32).23. Cylinder head cover according to claim 22, characterized in that said mutual sealing means (36, 53) comprise an annular groove (35, 49) arranged in said first wall (3), around said corresponding filling hole ( 11, 32), and an annular seal (36, 53) engaged in said annular groove (35, 49) and bearing on said second wall (28) around said corresponding hole (11, 32). 24. Couvre-culasse selon l'une quelconque des revendications 18 à 23, caractérisé en ce que les moyens d'accolement (28) font partie intégrante de ladite première pièce (1).24. Cylinder head cover according to any one of claims 18 to 23, characterized in that the joining means (28) form an integral part of said first part (1). 25. Couvre-culasse selon l'une quelconque des revendications 18 à 24, caractérisé en ce que les moyens d'accolement (31, 50) font partie intégrante de ladite deuxième pièce (2).25. Cylinder head cover according to any one of claims 18 to 24, characterized in that the joining means (31, 50) are an integral part of said second part (2). 26. Couvre-culasse selon l'une quelconque des revendications 14 à 25, caractérisé en ce que ledit bord libre (6) présente une gorge (9) de réception d'un joint (10) d'étanchéité vis-à-vis d'une culasse (8).26. Cylinder head cover according to any one of claims 14 to 25, characterized in that said free edge (6) has a groove (9) for receiving a seal (10) sealing vis-à-vis '' a cylinder head (8).
EP90401389A 1989-05-25 1990-05-23 Valve cover with oil separator and method for producing same Expired - Lifetime EP0399912B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90401389T ATE84117T1 (en) 1989-05-25 1990-05-23 CYLINDER HEAD COVER WITH OIL SETTLING SYSTEM AND MANUFACTURING PROCESS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8906873A FR2647506B1 (en) 1989-05-25 1989-05-25 METHOD FOR MANUFACTURING AN OIL DECANTER HEAD COVER, AND HEAD COVER OBTAINED BY THE IMPLEMENTATION OF THIS METHOD
FR8906873 1989-05-25

Publications (2)

Publication Number Publication Date
EP0399912A1 true EP0399912A1 (en) 1990-11-28
EP0399912B1 EP0399912B1 (en) 1992-12-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401389A Expired - Lifetime EP0399912B1 (en) 1989-05-25 1990-05-23 Valve cover with oil separator and method for producing same

Country Status (6)

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EP (1) EP0399912B1 (en)
AT (1) ATE84117T1 (en)
DE (1) DE69000693D1 (en)
ES (1) ES2036896T3 (en)
FR (1) FR2647506B1 (en)
PT (1) PT94142A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998032955A1 (en) * 1997-01-22 1998-07-30 Filterwerk Mann+Hummel Gmbh Internal combustion engine with a valve chamber cap
EP2336509A1 (en) * 2009-12-08 2011-06-22 MAN Truck & Bus AG Cylinder head cower for combustion engines
US8967110B2 (en) * 2012-11-16 2015-03-03 GM Global Technology Operations LLC Engine front cover with rotational support insert

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743678B4 (en) * 1997-10-02 2010-02-18 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Cylinder head cover for internal combustion engines
DE102006019880A1 (en) * 2006-04-28 2007-10-31 Audi Ag Motor housing cover for internal combustion engine, has inlet opening for exhaust medium that is conducted by exhaust system, and part of oil separator housing formed integrally with cover

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443576A1 (en) * 1978-12-04 1980-07-04 Nissan Motor SOUNDPROOF COVER FOR AN INTERNAL COMBUSTION ENGINE
EP0070500A1 (en) * 1981-07-16 1983-01-26 Nissan Motor Co., Ltd. Rocker cover assembly
US4565164A (en) * 1984-01-30 1986-01-21 Toyota Jidosha Kabushiki Kaisha Internal combustion engine cylinder-head cover
EP0208460A2 (en) * 1985-06-28 1987-01-14 Cummins Engine Company, Inc. Engine valve cover

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2443576A1 (en) * 1978-12-04 1980-07-04 Nissan Motor SOUNDPROOF COVER FOR AN INTERNAL COMBUSTION ENGINE
EP0070500A1 (en) * 1981-07-16 1983-01-26 Nissan Motor Co., Ltd. Rocker cover assembly
US4565164A (en) * 1984-01-30 1986-01-21 Toyota Jidosha Kabushiki Kaisha Internal combustion engine cylinder-head cover
EP0208460A2 (en) * 1985-06-28 1987-01-14 Cummins Engine Company, Inc. Engine valve cover

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998032955A1 (en) * 1997-01-22 1998-07-30 Filterwerk Mann+Hummel Gmbh Internal combustion engine with a valve chamber cap
DE19701977B4 (en) * 1997-01-22 2006-11-23 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Internal combustion engine with a valve chamber cover
EP2336509A1 (en) * 2009-12-08 2011-06-22 MAN Truck & Bus AG Cylinder head cower for combustion engines
US8967110B2 (en) * 2012-11-16 2015-03-03 GM Global Technology Operations LLC Engine front cover with rotational support insert

Also Published As

Publication number Publication date
ATE84117T1 (en) 1993-01-15
PT94142A (en) 1992-08-31
ES2036896T3 (en) 1993-06-01
DE69000693D1 (en) 1993-02-11
EP0399912B1 (en) 1992-12-30
FR2647506A1 (en) 1990-11-30
FR2647506B1 (en) 1994-02-18

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