EP0603318A1 - Cylinder head gasket, particularly for internal combustion engines, and method for manufacturing same - Google Patents

Cylinder head gasket, particularly for internal combustion engines, and method for manufacturing same

Info

Publication number
EP0603318A1
EP0603318A1 EP92920427A EP92920427A EP0603318A1 EP 0603318 A1 EP0603318 A1 EP 0603318A1 EP 92920427 A EP92920427 A EP 92920427A EP 92920427 A EP92920427 A EP 92920427A EP 0603318 A1 EP0603318 A1 EP 0603318A1
Authority
EP
European Patent Office
Prior art keywords
sheet
sheets
lining
joint according
joint
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.)
Withdrawn
Application number
EP92920427A
Other languages
German (de)
French (fr)
Inventor
Olivier Jeanne
Georges Ulmer
Daniel Montresor
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.)
Meillor SA
Original Assignee
Meillor SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FR9111319A external-priority patent/FR2681378B1/en
Priority claimed from FR9202171A external-priority patent/FR2687732B1/en
Application filed by Meillor SA filed Critical Meillor SA
Publication of EP0603318A1 publication Critical patent/EP0603318A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
    • F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
    • F16J15/122—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement generally parallel to the surfaces
    • F16J15/123—Details relating to the edges of the packing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
    • F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
    • F16J15/122—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement generally parallel to the surfaces

Definitions

  • the present invention relates to a weary cu ⁇ joint, in particular for an internal combustion engine, as well as the associated manufacturing process.
  • Many types of cylinder head gaskets are known, which are essentially divided into two categories, fibrous gaskets and metal gaskets, or more precisely metal-elastomer gaskets.
  • the fibrous joints which constitute the main part of the market, include a metallic reinforcement, more particularly a pitted metal sheet, a lining based on cardboard of com ⁇ pressible fibrous material which is stapled on the pins of this sheet and reinforcing elements. of different types, in particular localized deformations and / or crimps and / or inserts.
  • Such seals have an important advantage, ce ⁇ to allow a good distribution of the clamping forces which reduces the difference in rai ⁇ deur between the reinforcing elements and the rest of the joint.
  • the filling is made in a semi-worked material which requires an outstanding amount of products, a large storage of the many different cartons used, operations of receiving and checking these cartons and the control of semi-finished products. - finished.
  • the tightness at the heart of the lining and therefore of the seal which comprises it it remains open to criticism.
  • the mounting of the reinforcing elements must be carried out by means of special techniques, bonding, insert combined with crimping, the usefulness of which is reduced to the simple keeping of the insert before mounting the seal on the engine, solder point on the metal part before mounting the gasket, for example.
  • the cylinder head gaskets also ensure the watertightness of the auxiliary circuits of the cooling and lubrication fluids, and in the case of stapled material gaskets, it is most often necessary to use a screen printing operation. These joints with stapled material must very often undergo additional treatments such as impregnation or varnishing.
  • the metal seals are produced in different ways and a first type of seals is known which comprises several superimposed sheets, previously cut, with crimps arranged at the periphery of the corresponding holes to cylinders and cords molded from elastomer.
  • Liquid tightness is achieved by cor ⁇ donations molded from elastomer. Theoretically, such a seal allows a substantial reduction in the cylinder head clamping forces, since the contact pressures are located only at the place where a seal is required. However, the difference in stiffness between the crimp and the elastomeric cord is such that this assembly is made difficult if the clamping stops are not judiciously disposed around the periphery of the joint.
  • liquid tightness it is perfect provided that the molding is of high quality, in fact, any defect leads to a leak because there is no secondary seal, only the overmolded bead forming a barrier .
  • the gas tightness is excellent because the crimp solution has long been tested.
  • Gas tightness is obtained by a peripheral deformation of the stack of sheets in line with the holes corresponding to the bores.
  • the gas tightness is good because the slight creep of the nitrile elastomer makes it possible to achieve good adaptability of the crimp.
  • this type of seal has a large disadvantage. Indeed, the elastomer being deposited in a very thin layer, makes it possible to make fairly long leak paths for liquids, which gives this type of seal a good seal against liquids, but does not allow absorption high roughness. Also, the parting line must be perfectly machined with a very good surface condition.
  • the object of the present invention is to overcome the disadvantages of the above-mentioned cylinder head gaskets and to provide additional advantages.
  • the cylinder head gasket according to the invention allows an excellent distribution of the clamping forces over the entire surface of the gasket, while making it possible to vary this force locally, it also makes it possible to eliminate the screen printing and the various subsequent treatments of the fibrous joints aimed at achieving liquid tightness, char .
  • it provides a double seal, primary and secondary, with respect to fluids with a maximum leak path. It also leads to the production of a monolithic joint obtained from a molding of elastomer, hence increased ease of installation. This joint has very strict tolerances and it leads to very good compliance with tight thicknesses.
  • the seal can be fitted with all known crimping systems to achieve gas tightness, reliable and proven solutions of long standing, the quality of which cannot be questioned.
  • Manufacturing in addition to being precise, does not require any specific means, the number of steps is reduced, and the various metal sheets which make up this joint are perfectly bonded together.
  • This joint also has the advantage of resisting the phenomenon of "fretting" well, and on the other hand, thanks to the creep of the elastomer, it is possible to absorb significant roughness from the joint plane, which gives it a very high capacity for taking impressions.
  • the present invention provides a conventional cylinder head / metal / elastomer gasket and the associated manufacturing process.
  • the cylinder head gasket according to the invention in particular for an internal combustion engine, consists of a frame comprising at least one metal sheet combined with an elastomeric material, and in particular has holes corresponding to the cylinders of the engine, to the circuits coolant appendices disse ent and lubrication, as well as the tightening studs, and this cylinder head gasket is characterized in that it comprises elastic stops distributed over at least part of the surface of this gasket.
  • the frame is embedded in the elastomeric material which constitutes the lining.
  • the distributed elastic stops comprise elastic deformations formed in the sheet or sheets which protrude on either side of this or each of these sheets.
  • the elastic deformations formed in the sheet (s) are symmetrical with respect to the median plane of this or each of these sheets.
  • the frame comprises a stack of superimposed sheets, at least one of which is provided with distributed elastic stops, the other sheets being smooth.
  • the invention is also characterized in that at least one of the plates of the frame comprises at least one localized cutout to allow the stiffness of this joint to be adjusted to the right of this cutout.
  • the sheets of the frame have variable thicknesses.
  • the sheet is more especially a previously hardened sheet, in which the strips have been cut and folded which are then calibrated, so as to obtain deformations in S_, these strips having good elastic characteristics.
  • the seal comprises at least one reinforcing element, placed in line with the periphery of each of the corresponding holes. laying on the cylinders and intended in particular to locally increase the recovery of forces.
  • the reinforcing element is a localized deformation of the sheet or sheets making up the frame and / or a ser ⁇ weave.
  • the reinforcing element is an insert of the insert type.
  • the sheets of the reinforcement are adhered by the elastomeric material constituting the lining.
  • the cylinder head gasket is also characterized in that the insert constituting the reinforcing element is adhered to the frame by the elastomeric material of the lining.
  • the lining includes local sealing excess thicknesses of elastomeric material, in particular in line with the holes corresponding to the cir ⁇ cuit annexes.
  • the lining is of variable thickness so as to take into account the differential deformations of the cylinder head and of the engine block during operation.
  • the lining comprises, on at least one of its two faces, impressions so as to improve the impression taken on the joint planes of the cylinder head and of the engine block.
  • the elastomeric material has a low dynamic viscosity, more particularly chosen from the family of silicones, so as to allow filling of the various interstices.
  • the method of manufacturing the cylinder head gasket according to the invention comprises the following steps: - deformation of at least one sheet having the shape of the joint to be produced, on either side of its plane, to create a frame with distributed elastic stops, - possible stacking of several sheets,
  • lamellae are produced, in particular by cutting and folding, the sheet (s) thus provided are calibrated so as to have elastic strips. to give the sheet or sheets a free thickness greater than the nominal thickness of the sheet before deformation, the lamellae thus produced behaving under load like springs.
  • this reinforcing element is positioned in place and places, without prior deformation, in the mold with the armature and the desired deformation is carried out in the mold itself thanks to the pressure of ferm ⁇ ture and the profile of this mold.
  • FIG. 1 represents a partial sectional view of a sheet for the manufacture of a cylinder head gasket according to the invention
  • FIG. 2 represents a partial sectional view of a cylinder head gasket according to the invention
  • FIG. 3 represents a variant of a cylinder head gasket according to the invention, with a stack of sheets
  • - Figure 4 shows a variant of a cylinder head gasket with a crimp mounted on a prior peripheral deformation of the sheets around the holes corresponding to the engine cylinders
  • - Figures 5 and 6 show a schematic view of a particular method of producing a cylinder head gasket according to the invention
  • FIG. 7 is a schematic representation of the lamellae of a cylinder head gasket according to the invention to explain its behavior
  • FIG. 8 is a top view of a cylinder head gasket according to the invention.
  • Figure 9 is a sectional view along line 9-9 of Figure 8.
  • the nominal thickness e becomes the free thickness E because the lamellae after calibration remain plastically deformed, according to a sensitive profile in S, therefore with double deformation.
  • each strip is distributed symmetrically on either side of the sheet, each strip being in fact composed of two tongues 18 opposite.
  • the cutting of these tabs is substantially rectangular.
  • the sheet is shown in the cross-section through a hatched line, and the strips in solid line are the strips 20, of the first parallel row, and the strips 22, of the third row parallel to the plan row chopped off. These strips are in fact arranged in quin ⁇ designed.
  • This sheet is generally a hardened metal sheet which may have undergone a specific treatment aimed at giving it better elasticity characteristics.
  • This cylinder head gasket 22 comprises the sheet 10 provided with lamellae and calibrated, constituting the frame 8, as well as a lining 24 made up of an elastomer matrix 25.
  • the cylinder head gasket is mounted on an engine block 11, which includes the representation of a hole 13 corresponding to a cylinder of this engine.
  • the cylinder head gasket 22 includes the schematic representation of a ser ⁇ weave 26 in ⁇ of known type.
  • the frame 8 of the cylinder head gasket obtained is embedded in the elastomer matrix 25 of the lining 24.
  • the set of blades constitutes distributed elastic stops 28.
  • This seal is carried out by carrying out the following steps: - deformation of the sheet to create lamellae constituting distributed elastic stops 28,
  • This deposit can advantageously be obtained by molding and injection of the elastomer.
  • the reinforcing element can be deformed simultaneously with the molding operation thanks to the closing force of the mold, as will be explained later.
  • the lamellae can be produced in a simple manner by stamping and then introduced into a calibration machine.
  • Figure 7 there is shown a schematic view of a strip 12, in the foreground, and a strip 22, in the background.
  • the elastomer matrix 25 of the garment 24 is also shown diagrammatically.
  • the deformation in S of each of the tongues 18 gives them elastic qualities comparable to a return spring.
  • the elastomer participates for a small part in this resumption of efforts, on the other hand, it is found that it is distributed between the tongues, between the thickness e and the thickness E, as well as on the top of the lan ⁇ guettes but very thin layer.
  • FIG 3 there is shown a variant of cylinder head gasket 32, comprising a frame 30 with multiple sheets, in this case two sheets 34, 36, These sheets are provided with lamellae and calibrated in a similar manner to sheet 10 view previously.
  • the crimp 38 is mounted crimped on the two sheets simultaneously, these sheets being deformed.
  • the elastomer matrix 37, of the lining 39 covers the two faces of the stack but also infiltrates between the sheets, thus ensuring their adhesion.
  • the crimp is adhered to its edges, on the other hand, the elastomer does not penetrate inside the crimp, the passage being prohibited to it by the residual tightening force of the crimp on the armature, which is higher than the injection pressure.
  • each of the sheets can be cut so that locally only one sheet remains or, conversely, a part, of the insert type, can be dis ⁇ placed between the sheets to locally increase the stiffness.
  • the lining is produced by molding, as for a single sheet metal joint, and in order to improve the impression taking, the surface of the lining is provided with impressions, for example in the form of a bowl.
  • the seal 40 comprises a frame 41 comprising a stack of three sheets 42, 43, 44, the central sheet 43 being a smooth sheet while the sheets, lower and upper 42, 44, are of the type provided with lamellae and calibrated.
  • This stack is deformed at the periphery of the hole 13 corresponding to the cylinder of the engine and the lower and upper sheets each comprise a bos ⁇ sage 46.
  • the stack is embedded in an elastomer matrix 49 which ensures, in addition to sealing, the adhesion of the three sheets to each other.
  • the reinforcing element constituting the crimp 59, is arranged without deformation in the mold, in line with the edge of the three sheets 51, 52, and 53.
  • the reinforcing element in this case the crimp 59 is deformed to take the profile formed between the stop 58 and the recess 57. It is then advisable to inject the 'elastomer, which adheres the sheets together and which comes to maintain the crimp against the edge of these sheets. Taking into account the high precision of mold manufacturing, the setting must be positioned with very strict tolerances.
  • FIG 8 there is shown a cylinder head gasket 32, seen from above, with the holes 13 corresponding to the cylinders, the crimps 38, as well as the gar ⁇ niture 39. Also shown are the holes 80, corresponding to the passage of the studs, and the holes 81, corresponding to the passage of the fluids from the annexed circuits, cooling fluid or lubricant, thus only to certain particular housings 82.
  • This cylinder head gasket is shown in section in the figure 9 along line 9-9 of Figure 8.
  • the present invention allows to provide the right of the holes 81, corresponding to the auxiliary circuits, specific seals for fluids.
  • the elastomer is deposited with an extra thickness at the periphery of the holes of the auxiliary circuits.
  • Such a seal thus has excellent fluid tightness.
  • the peripheral lip having come from molding with the whole of the elastomer matrix, it has a great resistance to tearing.
  • the advantages of the head gasket which has just been described are significant. Indeed, the distributed elastic stops, the stiffness of which can be varied, make it possible to avoid excessively large deformations of an area beyond the joint.
  • the seal according to the invention also has an important advantage, especially for future engines because it allows excellent control of tight thicknesses, during the life of the seal, so that the volume of the combustion chamber does not vary. so many variations in the quality of combustion. This makes it possible to participate in the fight against pollution. It is then interesting to recall that the color of the elastomer can vary and in this case it is possible to establish a color code as a function of the thicknesses, in correlation with the position of the pistons relative to the upper tablature of the mo block. tor. This is particularly interesting in the case of diesel engines.
  • the thickness of the joint can vary with a very fine pitch, it suffices for this to add thin sheets which play the role of shims during the manufacture of this joint.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
  • Sealing Material Composition (AREA)
  • Joints Allowing Movement (AREA)

Abstract

A sheet gasket, particularly for internal combustion engines, consisting of at least one metal sheet forming a core which is cut to match the mating face, and elastomeric portions, particularly in bead form, which are bonded to said sheet around holes to be sealed. The gasket includes a single-piece elastomeric covering placed on part of the sheet surface to form localized sealing projections around the holes to be sealed. A related manufacturing method is also provided.

Description

,v JOINT DE CULASSE, NOTAMMENT POUR MOTEUR A COMBUSTION INTERNE, ET PROCEDE DE FABRICATION ASSOCIE" , v CYLINDER HEAD GASKET, ESPECIALLY FOR AN INTERNAL COMBUSTION ENGINE, AND MANUFACTURING METHOD THEREOF "
La présente invention a pour objet un joint de cu¬ lasse, notamment pour moteur à combustion interne, ainsi que le procédé de fabrication associé. On connaît de nombreux types de joints de culasse qui se répartissent essentiellement en deux catégo¬ ries, les joints fibreux et les joints métalliques ou plus exactement les joints métal-élastomère. Les joints fibreux, qui constituent l'essentiel du marché, comprennent une armature métallique, plus particulièrement une tôle métallique picotée, une garniture à base de carton de matériau fibreux com¬ pressible qui est agrafée sur les picots de cette tôle et des éléments de renfort de différents types notamment des déformations localisées et/ou des ser- tissures et/ ou des inserts.The present invention relates to a weary cu¬ joint, in particular for an internal combustion engine, as well as the associated manufacturing process. Many types of cylinder head gaskets are known, which are essentially divided into two categories, fibrous gaskets and metal gaskets, or more precisely metal-elastomer gaskets. The fibrous joints, which constitute the main part of the market, include a metallic reinforcement, more particularly a pitted metal sheet, a lining based on cardboard of com¬ pressible fibrous material which is stapled on the pins of this sheet and reinforcing elements. of different types, in particular localized deformations and / or crimps and / or inserts.
De tels joints présentent un avantage important,ce¬ lui de permettre une bonne répartition des efforts de serrage ce qui permet de réduire l'écart de rai¬ deur entre les éléments de renfort et le reste du joint.Such seals have an important advantage, ce¬ to allow a good distribution of the clamping forces which reduces the difference in rai¬ deur between the reinforcing elements and the rest of the joint.
Néanmoins ces joints à matériau agrafé ne donnent pas entière satisfaction.However, these seals with stapled material are not entirely satisfactory.
Tout d'abord la garniture est réalisée dans un maté¬ riau semi-ouvré qui nécessite un encours des pro- duits, un stockage important des nombreux cartons différents utilisés, des opérations de contrôle ré¬ ception de ces cartons et le contrôle des produits semi-finis. Quant à l'étanchéité à coeur de la garniture et donc du joint qui la comprend, elle reste critiquable.First of all, the filling is made in a semi-worked material which requires an outstanding amount of products, a large storage of the many different cartons used, operations of receiving and checking these cartons and the control of semi-finished products. - finished. As for the tightness at the heart of the lining and therefore of the seal which comprises it, it remains open to criticism.
De plus le montage des éléments de renfort doit être effectué au moyen de techniques particulières, col¬ lage, insert combiné avec un sertissage dont l'uti¬ lité est réduite à la simple tenue de l'insert avant montage du joint sur le moteur, point de soudure sur la partie métallique préalablement au montage de la garniture, par exemple.Furthermore, the mounting of the reinforcing elements must be carried out by means of special techniques, bonding, insert combined with crimping, the usefulness of which is reduced to the simple keeping of the insert before mounting the seal on the engine, solder point on the metal part before mounting the gasket, for example.
Les joints de culasse assurent également l'étan- chéité des circuits annexes des fluides de refroi- dissement et de lubrification et dans le cas des joints à matériau agrafé il est nécessaire de recou¬ rir le plus souvent à une opération de sérigraphie. Ces joints à matériau agrafé doivent bien souvent subir des traitements complémentaires tels qu'une imprégnation ou un vernissage.The cylinder head gaskets also ensure the watertightness of the auxiliary circuits of the cooling and lubrication fluids, and in the case of stapled material gaskets, it is most often necessary to use a screen printing operation. These joints with stapled material must very often undergo additional treatments such as impregnation or varnishing.
Les joints métalliques, plus exactement métal-élas- tomère, sont réalisés de différentes façons et l'on connaît un premier type de joints qui comprend plu¬ sieurs feuilles superposées, préalablement décou- pées, avec des sertissures disposées à la périphérie des trous correspondant aux cylindres et des cordons moulés en élastomère.The metal seals, more precisely metal-elastomer, are produced in different ways and a first type of seals is known which comprises several superimposed sheets, previously cut, with crimps arranged at the periphery of the corresponding holes to cylinders and cords molded from elastomer.
Ainsi l'étanchêité aux gaz est obtenue de façon con¬ nue par des moyens métalliques qui garantissent une bonne reprise élastique, un fluage nul et une bonne tenue thermique.Thus gas tightness is obtained in a con¬ naked manner by metallic means which guarantee good elastic recovery, zero creep and good thermal resistance.
L'étanchêité aux liquides est réalisée par les cor¬ dons moulés en élastomère. Théoriquement, un tel joint autorise une réduction conséquente des efforts de serrage bloc-culasse, car les pressions de contact sont localisés uniquement aux endroit où une étanchéité est nécessaire. Cependant, la différence de raideur entre la sertis¬ sure et le cordon élastomère est telle que ce mon- tage est rendu difficile si des butées de serrage ne sont pas judicieusement disposées sur le pourtour du joint.Liquid tightness is achieved by cor¬ donations molded from elastomer. Theoretically, such a seal allows a substantial reduction in the cylinder head clamping forces, since the contact pressures are located only at the place where a seal is required. However, the difference in stiffness between the crimp and the elastomeric cord is such that this assembly is made difficult if the clamping stops are not judiciously disposed around the periphery of the joint.
Dans ce cas, les répartitions de pression sont très discontinues, ce qui induit des concentrations de contraintes importantes dans la culasse. Toutefois, cette conception est la seule actuellement à présen¬ ter cette perspective de réduction d'efforts de ser¬ rage.In this case, the pressure distributions are very discontinuous, which induces significant stress concentrations in the cylinder head. However, this design is the only one currently to present this prospect of reducing clamping efforts.
En ce qui concerne l'étanchêité aux liquides, elle est parfaite sous réserve que le moulage soit de haute qualité, en effet, tout défaut conduit à une fuite car il n'y a pas d'étanchéité secondaire, seul le cordon surmoulé faisant barrière. Par contre, l'étanchêité aux gaz est excellente car la solution à sertissures est depuis longtemps éprouvée.Regarding liquid tightness, it is perfect provided that the molding is of high quality, in fact, any defect leads to a leak because there is no secondary seal, only the overmolded bead forming a barrier . On the other hand, the gas tightness is excellent because the crimp solution has long been tested.
Un autre type de joint métal/élastomère, existe ac¬ tuellement sur le marché. Ce type de joints est composé d'un empilement de feuilles, revêtu d'une fine couche d'élastomère, de quelques centièmes de millimètres d'épaisseur, plus particulièrement choisi parmi ceux de la famille des nitriles. Dans ce cas, les contraintes de serrage sont répar- ties assez uniformément sur la surface du joint, de façon analogue aux joints fibreux.Another type of metal / elastomer seal is currently on the market. This type of seal is composed of a stack of sheets, coated with a thin layer of elastomer, a few hundredths of a millimeter thick, more particularly chosen from those of the nitrile family. In this case, the tightening stresses are distributed fairly evenly over the surface of the joint, in a similar way to the fibrous joints.
L'étanchêité aux gaz est obtenue par une déformation périphérique de l'empilement de feuilles au droit des trous correspondant aux alésages. Dans ce cas, l'étanchêité aux gaz est bonne car le léger fluage de l'élastomère nitrile permet de réa¬ liser une bonne adaptabilité de la sertissure. Par contre, ce type de joints présente un gros in¬ convénient. En effet, l'élastomère étant déposé en couche très mince, permet de réaliser des chemins de fuite assez longs pour les liquides, ce qui confère à ce type de joint une bonne étanchéité aux liqui¬ des, mais n'autorise pas l'absorption de rugosités élevées. Aussi, le plan de joint doit-il être par- faitement usiné avec un très bon état de surface. De plus, il est impossible de faire varier en épais¬ seur la couche d'élastomère ainsi déposée car ces élastomères deviennent cassants en couche épaisse, et dans tous les cas, l'élastomère ne pénètre pas entre les différentes feuilles de l'empilement. Les différentes feuilles ne sont donc pas adhérisées entre elles par l'élastomère qui n'a qu'un rôle d'é- tanchéi é.Gas tightness is obtained by a peripheral deformation of the stack of sheets in line with the holes corresponding to the bores. In this case, the gas tightness is good because the slight creep of the nitrile elastomer makes it possible to achieve good adaptability of the crimp. On the other hand, this type of seal has a large disadvantage. Indeed, the elastomer being deposited in a very thin layer, makes it possible to make fairly long leak paths for liquids, which gives this type of seal a good seal against liquids, but does not allow absorption high roughness. Also, the parting line must be perfectly machined with a very good surface condition. In addition, it is impossible to vary the thickness of the elastomer layer thus deposited because these elastomers become brittle in a thick layer, and in all cases, the elastomer does not penetrate between the different sheets of the stack. The different sheets are therefore not adhered to each other by the elastomer which has only a sealing role.
Par ailleurs, les feuilles étant lisses, il n'y a aucun effet élastique et l'adaptabilité d'un tel joint en fonction des besoins reste très médiocre. Il est également rappelé que le dépôt d'élastomère nitrile est délicat et en couche mince il ne peut être réalisé par moulage, ce qui diminue encore l'a- daptabilité.Furthermore, the sheets being smooth, there is no elastic effect and the adaptability of such a joint as required remains very poor. It is also recalled that the deposition of nitrile elastomer is delicate and in a thin layer it cannot be produced by molding, which further reduces the adaptability.
Enfin, un tel joint permet difficilement de faire varier la raideur localement, si bien que le joint est parfaitement homogène et sera serré en dehors de la sertissure avec une pression identique sur toute sa surface, sauf à la périphérie des nervures au droit des circuits annexes.Finally, such a seal makes it difficult to vary the stiffness locally, so that the seal is perfectly homogeneous and will be tightened outside the crimp with identical pressure over its entire surface, except at the periphery of the ribs in line with the auxiliary circuits. .
La présente invention a pour but de pallier les in¬ convénients des joints de culasse précités et d'ap¬ porter des avantages supplémentaires. En effet, le joint de culasse selon l'invention, permet une excellente répartition des efforts de serrage sur toute la surface du joint, tout en per¬ mettant de faire varier localement cet effort, il permet en outre de supprimer la sérigraphie et les différents traitements ultérieurs des joints fibreux visant à réaliser l'étanchêité aux liquides, car.il assure une double êtanchéité, primaire et secondai¬ re, vis à vis des fluides avec un chemin de fuite maximum. Il conduit en outre à la réalisation d'un joint monolithique obtenu à partir d'un moulage d'é- lastomère, d'où une facilité de pose accrue. Ce joint a des tolérances très strictes et il conduit à un très bon respect des épaisseurs serrées. De plus, le joint peut être équipé de tous les sys- ternes connus de sertissure pour réaliser l'étan¬ chêité aux gaz, solutions fiables et éprouvées de longue date dont la qualité ne peut être remise en cause. La fabrication, en plus d'être précise, ne requiert aucun moyen spécifique, le nombre d'étapes est ré¬ duit, et les différentes tôles métalliques qui com¬ posent ce joint sont parfaitement adhérisées entre elles. Ce joint, présente également l'avantage de bien ré- sister au phénomène de "fretting", et il a d'autre part grâce au fluage de l'élastomère la possibilité d'absorber des rugosités importantes du plan de joint ce qui lui donne une très grande capacité de prise d'empreintes. Lors de la fabrication, de simples contrôles de poids, permettent de vérifier que toutes les pièces constituant le joint sont assemblées, et en jouant sur la couleur de la composition d'élastomère il est possible de distinguer les différentes épaisseurs de joints de culasse prévues pour etancher le même mo¬ teur, diesel par exemple.The object of the present invention is to overcome the disadvantages of the above-mentioned cylinder head gaskets and to provide additional advantages. In fact, the cylinder head gasket according to the invention allows an excellent distribution of the clamping forces over the entire surface of the gasket, while making it possible to vary this force locally, it also makes it possible to eliminate the screen printing and the various subsequent treatments of the fibrous joints aimed at achieving liquid tightness, char . it provides a double seal, primary and secondary, with respect to fluids with a maximum leak path. It also leads to the production of a monolithic joint obtained from a molding of elastomer, hence increased ease of installation. This joint has very strict tolerances and it leads to very good compliance with tight thicknesses. In addition, the seal can be fitted with all known crimping systems to achieve gas tightness, reliable and proven solutions of long standing, the quality of which cannot be questioned. Manufacturing, in addition to being precise, does not require any specific means, the number of steps is reduced, and the various metal sheets which make up this joint are perfectly bonded together. This joint also has the advantage of resisting the phenomenon of "fretting" well, and on the other hand, thanks to the creep of the elastomer, it is possible to absorb significant roughness from the joint plane, which gives it a very high capacity for taking impressions. During manufacture, simple weight checks make it possible to verify that all the parts constituting the seal are assembled, and by varying the color of the elastomer composition it is possible to distinguish the different thicknesses of cylinder head gaskets provided for switch off the same engine, diesel for example.
A cet effet, la présente invention propose un joint de culasse classique/métal/élastomère ainsi que le procédé de fabrication associé. Le joint de culasse, selon l'invention, notamment pour moteur à combustion interne, se compose d'une armature comportant au moins une tôle métallique combinée avec un matériau élastomère, et possède no¬ tamment des trous correspondant aux cylindres du moteur, aux circuits annexes des fluides de refroi- disse ent et de lubrification, ainsi qu'aux goujons de serrage, et ce joint de culasse se caractérise en ce qu'il comprend des butées élastiques réparties sur au moins une partie de la surface de ce joint. Selon une autre caractéristique de l'invention, l'armature est noyée dans le matériau élastomère qui constitue la garniture.To this end, the present invention provides a conventional cylinder head / metal / elastomer gasket and the associated manufacturing process. The cylinder head gasket according to the invention, in particular for an internal combustion engine, consists of a frame comprising at least one metal sheet combined with an elastomeric material, and in particular has holes corresponding to the cylinders of the engine, to the circuits coolant appendices disse ent and lubrication, as well as the tightening studs, and this cylinder head gasket is characterized in that it comprises elastic stops distributed over at least part of the surface of this gasket. According to another characteristic of the invention, the frame is embedded in the elastomeric material which constitutes the lining.
Selon un mode de réalisation particulier de l'inven¬ tion, les butées élastiques réparties comprennent des déformations élastiques ménagées dans la ou les tôles qui font saillie de part et d'autre de cette ou de chacune de ces tôles.According to a particular embodiment of the invention, the distributed elastic stops comprise elastic deformations formed in the sheet or sheets which protrude on either side of this or each of these sheets.
Selon une autre caractéristique de l'invention, les déformations élastiques ménagées dans la ou les tô- les sont symétriques par rapport au plan médian de cette ou de chacune de ces tôles.According to another characteristic of the invention, the elastic deformations formed in the sheet (s) are symmetrical with respect to the median plane of this or each of these sheets.
Selon une autre caractéristique, l'armature comprend un empilement de tôles superposées, dont l'une au moins est munie de butées élastiques réparties, les autres tôles étant lisses.According to another characteristic, the frame comprises a stack of superimposed sheets, at least one of which is provided with distributed elastic stops, the other sheets being smooth.
L'invention se caractérise également en ce que l'une au moins des tôles de l'armature comprend au moins une découpe localisée pour permettre d'ajuster la raideur de ce joint au droit de cette découpe. Selon un mode particulier de réalisation de l'inven¬ tion, les tôles de l'armature ont des épaisseurs variables.The invention is also characterized in that at least one of the plates of the frame comprises at least one localized cutout to allow the stiffness of this joint to be adjusted to the right of this cutout. According to a particular embodiment of the invention, the sheets of the frame have variable thicknesses.
La tôle est plus spécialement une tôle préalablement écrouie, dans laquelle on a découpé et plié des la- melles qui sont ensuite calibrées, de façon à obte¬ nir des déformations en S_, ces lamelles ayant de bonnes caractéristiques élastiques.The sheet is more especially a previously hardened sheet, in which the strips have been cut and folded which are then calibrated, so as to obtain deformations in S_, these strips having good elastic characteristics.
Selon un mode particulier de réalisation, le joint comprend au moins un élément de renfort, disposé au droit de la périphérie de chacun des trous corres- pondant aux cylindres et prévu notamment pour aug¬ menter localement la reprise des efforts. Selon une autre caractéristique de l'invention, l'é¬ lément de renfort est une déformation localisée de la ou des tôles composant l'armature et/ou une ser¬ tissure.According to a particular embodiment, the seal comprises at least one reinforcing element, placed in line with the periphery of each of the corresponding holes. laying on the cylinders and intended in particular to locally increase the recovery of forces. According to another characteristic of the invention, the reinforcing element is a localized deformation of the sheet or sheets making up the frame and / or a ser¬ weave.
Selon un mode particulier de réalisation, l'élément de renfort est une pièce rapportée du type insert. Selon une autre caractéristique, les tôles de l'ar- mature sont adherisées par le matériau élastomère constituant la garniture.According to a particular embodiment, the reinforcing element is an insert of the insert type. According to another characteristic, the sheets of the reinforcement are adhered by the elastomeric material constituting the lining.
Le joint de culasse se caractérise également en ce que la pièce rapportée constituant l'élément de ren¬ fort est adhérisée à l'armature par le matériau élastomère de la garniture.The cylinder head gasket is also characterized in that the insert constituting the reinforcing element is adhered to the frame by the elastomeric material of the lining.
Par ailleurs, la garniture comprend des surépais¬ seurs locales d'étanchéité en matériau élastomère, notamment au droit des trous correspondant aux cir¬ cuits annexes. De plus, la garniture est à épaisseur variable de façon à prendre en compte les déformations différen¬ tielles de la culasse et du bloc moteur lors du fonctionnement. Selon une autre caractéristique de l'invention, la garniture comprend sur l'une au moins de ses deux faces des impressions de façon à améliorer la prise d'empreinte sur les plans de joint de la culasse et du bloc moteur. Selon un mode particulier de réalisation de l'inven- tion, le matériau élastomère possède une viscosité dynamique faible, plus particulièrement choisi dans la famille des silicones, de façon à permettre le remplissage des différents interstices. Le procédé de fabrication du joint de culasse selon l'invention comprend les étapes suivantes : - déformation d'au moins une tôle ayant la forme du joint à fabriquer, de part et d'autre de son plan, pour créer une armature avec des butées élastiques réparties, - empilement éventuel de plusieurs tôles,Furthermore, the lining includes local sealing excess thicknesses of elastomeric material, in particular in line with the holes corresponding to the cir¬ cuit annexes. In addition, the lining is of variable thickness so as to take into account the differential deformations of the cylinder head and of the engine block during operation. According to another characteristic of the invention, the lining comprises, on at least one of its two faces, impressions so as to improve the impression taken on the joint planes of the cylinder head and of the engine block. According to a particular embodiment of the invention, the elastomeric material has a low dynamic viscosity, more particularly chosen from the family of silicones, so as to allow filling of the various interstices. The method of manufacturing the cylinder head gasket according to the invention comprises the following steps: - deformation of at least one sheet having the shape of the joint to be produced, on either side of its plane, to create a frame with distributed elastic stops, - possible stacking of several sheets,
- mise en place éventuelle d'éléments de renfort,- possible installation of reinforcing elements,
- dépôt d'une garniture en matériau élastomère. Selon un mode particulier de l'invention, et pour obtenir la déformation de la ou des tôles, on réa- lise des lamelles, notamment par découpage et plia¬ ge, on calibre la ou les tôles ainsi munies de la¬ melles élastiques de façon à conférer à la ou aux tôles une épaisseur libre supérieure à l'épaisseur nominale de la tôle avant déformation, les lamelles ainsi réalisées se comportant sous charge comme des ressorts.- deposit of a lining of elastomeric material. According to a particular embodiment of the invention, and in order to obtain the deformation of the sheet (s), lamellae are produced, in particular by cutting and folding, the sheet (s) thus provided are calibrated so as to have elastic strips. to give the sheet or sheets a free thickness greater than the nominal thickness of the sheet before deformation, the lamellae thus produced behaving under load like springs.
Selon un mode particulier de réalisation, dans le cas où l'armature comprend un élément de renfort et où le dépôt de la garniture est réalisé par moulage, on positionne en lieu et place cet élément de ren¬ fort, sans déformation préalable, dans le moule avec l'armature et on réalise la déformation recherchée dans le moule lui-même grâce à la pression de ferme¬ ture et au profil de ce moule. La présente invention est décrite ci-après selon un mode de réalisation particulier en regard des des¬ sins annexés sur lesquels :According to a particular embodiment, in the case where the frame comprises a reinforcing element and where the deposition of the lining is produced by molding, this reinforcing element is positioned in place and places, without prior deformation, in the mold with the armature and the desired deformation is carried out in the mold itself thanks to the pressure of ferm¬ ture and the profile of this mold. The present invention is described below according to a particular embodiment with reference to the appended drawings in which:
- la figure 1 représente une vue partielle en coupe d'une tôle pour la fabrication d'un joint de culasse selon l'invention,FIG. 1 represents a partial sectional view of a sheet for the manufacture of a cylinder head gasket according to the invention,
- la figure 2 représente une vue partielle en coupe d'un joint de culasse selon l'invention,FIG. 2 represents a partial sectional view of a cylinder head gasket according to the invention,
- la figure 3 représente une variante d'un joint de culasse selon l'invention, avec un empilement de tôles, - la figure 4 représente une variante d'un joint de culasse avec une sertissure montée sur une déforma¬ tion périphérique préalable des tôles autour des trous correspondant aux cylindres du moteur, - les figures 5 et 6 représentent une vue schémati¬ que d'une procédé de réalisation particulier d'un joint de culasse selon l'invention,FIG. 3 represents a variant of a cylinder head gasket according to the invention, with a stack of sheets, - Figure 4 shows a variant of a cylinder head gasket with a crimp mounted on a prior peripheral deformation of the sheets around the holes corresponding to the engine cylinders, - Figures 5 and 6 show a schematic view of a particular method of producing a cylinder head gasket according to the invention,
- la figure 7 est une représentation schématique des lamelles d'un joint de culasse selon l'invention pour en expliquer son comportement, la figure 8 est une vue de dessus d'un joint de culasse selon l'invention, etFIG. 7 is a schematic representation of the lamellae of a cylinder head gasket according to the invention to explain its behavior, FIG. 8 is a top view of a cylinder head gasket according to the invention, and
- la figure 9 est une vue en coupe selon la ligne 9- 9 de la figure 8. Sur la figure 1 on a représenté une armature 8 avec une tôle 10, comportant des lamelles 12. Ces lamel¬ les sont découpées dans la tôle par emboutissage et déformées de façon à présenter une première déforma¬ tion 14 en pied, puis elles sont calibrées afin de leur conférer une seconde déformation 16 dans l'au¬ tre sens.- Figure 9 is a sectional view along line 9-9 of Figure 8. In Figure 1 there is shown an armature 8 with a sheet 10, comprising strips 12. These lamel¬ the are cut from the sheet by stamping and deformed so as to present a first deformation 14 at the bottom, then they are calibrated so as to give them a second deformation 16 in the other direction.
L'épaisseur nominale e devient l'épaisseur libre E car les lamelles après calibrage restent déformées plastiquement, suivant un profil sensible en S, donc à double déformation.The nominal thickness e becomes the free thickness E because the lamellae after calibration remain plastically deformed, according to a sensitive profile in S, therefore with double deformation.
Les lamelles sont réparties de façon symétrique de part et d'autre de la tôle, chaque lamelle étant en fait composée de deux languettes 18 en vis à vis. La découpe de ces languettes est sensiblement rectangu- laire.The strips are distributed symmetrically on either side of the sheet, each strip being in fact composed of two tongues 18 opposite. The cutting of these tabs is substantially rectangular.
Sur cette même figure 1, on a représenté la tôle dans le plan de coupe en trait hachuré, et les la¬ melles en trait plein sont les lamelles 20, de la première rangée parallèle, et les lamelles 22, de la troisième rangée parallèle à la rangée du plan de coupe. Ces lamelles sont en effet disposées en quin¬ conce.In this same FIG. 1, the sheet is shown in the cross-section through a hatched line, and the strips in solid line are the strips 20, of the first parallel row, and the strips 22, of the third row parallel to the plan row chopped off. These strips are in fact arranged in quin¬ designed.
Cette tôle est généralement une tôle en métal écroui qui peut avoir subi un traitement spécifique visant à lui conférer de meilleures caractéristiques d'é¬ lasticité.This sheet is generally a hardened metal sheet which may have undergone a specific treatment aimed at giving it better elasticity characteristics.
Par contre, elle subit un calibrage qui permet de transformer les agrafes en lames élastiques formant autant de ressorts de rappel. Sur la figure 2 , on a utilisé la tôle munie de la¬ melles et calibrée de la figure 1 pour réaliser un joint de culasse selon l'invention.On the other hand, it undergoes a calibration which makes it possible to transform the staples into elastic blades forming as many return springs. In Figure 2, we used the sheet provided with la¬ melles and calibrated in Figure 1 to make a cylinder head gasket according to the invention.
Ce joint de culasse 22 comprend la tôle 10 munie de lamelles et calibrée, constituant l'armature 8, ainsi qu'une garniture 24 constituée d'une matrice élastomère 25.This cylinder head gasket 22 comprises the sheet 10 provided with lamellae and calibrated, constituting the frame 8, as well as a lining 24 made up of an elastomer matrix 25.
Sur cette figure 2, le joint de culasse est monté sur un bloc moteur 11, qui comprend la représenta¬ tion d'un trou 13 correspondant à un cylindre de ce moteur.In this FIG. 2, the cylinder head gasket is mounted on an engine block 11, which includes the representation of a hole 13 corresponding to a cylinder of this engine.
En outre, au droit du trou 13, le joint de culasse 22 comprend la représentation schématique d'une ser¬ tissure 26 en Ç de type connu.In addition, in line with the hole 13, the cylinder head gasket 22 includes the schematic representation of a ser¬ weave 26 in Ç of known type.
L'armature 8 du joint de culasse obtenu est noyée dans la matrice élastomère 25 de la garniture 24.The frame 8 of the cylinder head gasket obtained is embedded in the elastomer matrix 25 of the lining 24.
L'ensemble des lamelles constitue des butées élasti¬ ques réparties 28.The set of blades constitutes distributed elastic stops 28.
La fabrication de ce joint s'effectue en réalisant les étapes suivantes : - déformation de la tôle pour créer des lamelles constituant des butées élastiques réparties 28,The manufacture of this seal is carried out by carrying out the following steps: - deformation of the sheet to create lamellae constituting distributed elastic stops 28,
- mise en place de l'élément de renfort en l'occur¬ rence la sertissure 26, et- Installation of the reinforcing element in this case the crimp 26, and
- dépôt de la garniture 24 en matériau élastomère. Ce dépôt peut avantageusement être obtenu par mou¬ lage et injection de l'élastomère.depositing the lining 24 in elastomeric material. This deposit can advantageously be obtained by molding and injection of the elastomer.
De même, l'élément de renfort peut être déformé si¬ multanément à l'opération de moulage grâce à l'ef- fort de fermeture du moule ainsi que cela sera ex¬ pliqué ultérieurement.Likewise, the reinforcing element can be deformed simultaneously with the molding operation thanks to the closing force of the mold, as will be explained later.
Quant aux lamelles, elles peuvent être réalisées de façon simple par emboutissage puis introduites dans une machine de calibrage. Sur la figure 7, on a représenté une vue schématique d'une lamelle 12, en avant plan, et d'un lamelle 22, en arrière plan. La matrice élastomère 25 de la gar¬ niture 24 est également représentée schématiquement. La déformation en S de chacune des languettes 18 leur confère des qualités élastiques assimilables à un ressort de rappel.As for the lamellae, they can be produced in a simple manner by stamping and then introduced into a calibration machine. In Figure 7, there is shown a schematic view of a strip 12, in the foreground, and a strip 22, in the background. The elastomer matrix 25 of the garment 24 is also shown diagrammatically. The deformation in S of each of the tongues 18 gives them elastic qualities comparable to a return spring.
Ces languettes étant parfaitement symétriques, les butées élastiques réparties travaillent de façon ho¬ mogène de part et d'autre du joint, en vis à vis des plans de joint du bloc moteur et de la culasse.These tabs being perfectly symmetrical, the elastic stops distributed work in a homogeneous manner on either side of the joint, facing the joint planes of the engine block and the cylinder head.
Lorsqu'un effort de serrage est exercé, le joint s'écrase, l'effort étant repris sur toute la surface du joint par les butées élastiques réparties, c'est- à-dire par une multitude de ressorts de rappel ré- partis de façon homogène, sauf au droit des sertis¬ sures qui de façon connue absorbent sensiblement 50 % de l'effort.When a clamping force is exerted, the seal is crushed, the force being taken up over the entire surface of the seal by the distributed elastic stops, that is to say by a multitude of return springs distributed from homogeneously, except in the right of the sertis¬ sures which in known manner absorb substantially 50% of the effort.
L'élastomère participe pour une faible part à cette reprise des efforts, par contre, on constate qu'il est réparti entre les languettes, entre l'épaisseur e et l'épaisseur E, ainsi que sur le dessus des lan¬ guettes mais en couche très mince.The elastomer participates for a small part in this resumption of efforts, on the other hand, it is found that it is distributed between the tongues, between the thickness e and the thickness E, as well as on the top of the lan¬ guettes but very thin layer.
Cette couche n'a aucun rôle spécifique, par contre, on constate que chaque paire de languettes en sail- lie, sur une face ou sur l'autre, est entourée d'é- lastomère, tel un îlot, ce qui confère à ce joint des chemins de fuite maximum vis à vis des fluides. D'autre part, l'étanchêité aux gaz obtenue à l'aide d'un élément de renfort de type connu, tel qu'une sertissure est d'une grande qualité, ces solutions ayant été depuis longtemps éprouvées. De plus, le grand nombre de sertissures existant permet une bonne adaptabilité. De nouvelles sertis¬ sures peuvent même être envisagées car l'adhérisa- tion par l'élastomère permet un pré-positionnement efficaceThis layer has no specific role, on the other hand, we see that each pair of tabs in sailails, on one side or the other, is surrounded by the lastomer, like an island, which gives this joint maximum leakage paths towards fluids. On the other hand, the gas tightness obtained using a reinforcing element of known type, such as a crimp is of high quality, these solutions having long been tested. In addition, the large number of existing crimps allows good adaptability. New seams can even be envisaged because adhesion by the elastomer allows effective pre-positioning
Sur la figure 3, on a représenté une variante de joint de culasse 32, comportant une armature 30 à tôles multiples, en l'occurrence deux tôles 34, 36, Ces tôles sont munies de lamelles et calibrées de façon analogue à la tôle 10 vue précédemment. Dans ce cas, la sertissure 38 est montée sertie sur les deux tôles simultanément, ces tôles étant défor¬ mées. La matrice élastomère 37, de la garniture 39, recouvre les deux faces de l'empilement mais égale¬ ment s'infiltre entre les tôles, assurant ainsi leur adhérisation.In Figure 3, there is shown a variant of cylinder head gasket 32, comprising a frame 30 with multiple sheets, in this case two sheets 34, 36, These sheets are provided with lamellae and calibrated in a similar manner to sheet 10 view previously. In this case, the crimp 38 is mounted crimped on the two sheets simultaneously, these sheets being deformed. The elastomer matrix 37, of the lining 39, covers the two faces of the stack but also infiltrates between the sheets, thus ensuring their adhesion.
De même, la sertissure est adhérisée sur ses chants, par contre, l'élastomère ne pénètre pas à l'inté- rieur de la sertissure, le passage lui étant inter¬ dit par l'effort de serrage résiduel de la sertis- sure sur l'armature, qui est supérieur à la pression d'injection.Likewise, the crimp is adhered to its edges, on the other hand, the elastomer does not penetrate inside the crimp, the passage being prohibited to it by the residual tightening force of the crimp on the armature, which is higher than the injection pressure.
Dans le cas d'un joint de culasse à tôles multiples, chacune des tôles peut être découpée de façon que, localement il ne subsiste qu'une seule tôle ou, à l'inverse, une pièce, de type insert, peut être dis¬ posée entre les tôles pour augmenter localement la raideur. La garniture est réalisée par moulage, comme pour un joint à tôle unique, et de façon à améliorer la prise d'empreinte, la surface de la garniture est munie d'impressions, par exemple en forme de cuvet- te.In the case of a multiple-sheet cylinder head gasket, each of the sheets can be cut so that locally only one sheet remains or, conversely, a part, of the insert type, can be dis¬ placed between the sheets to locally increase the stiffness. The lining is produced by molding, as for a single sheet metal joint, and in order to improve the impression taking, the surface of the lining is provided with impressions, for example in the form of a bowl.
Sur la figure 4, le joint 40 comprend une armature 41 comportant un empilement de trois tôles 42, 43, 44, la tôle médiane 43 étant une tôle lisse tandis que les tôles, inférieure et supérieure 42, 44, sont du type muni de lamelles et calibré.In FIG. 4, the seal 40 comprises a frame 41 comprising a stack of three sheets 42, 43, 44, the central sheet 43 being a smooth sheet while the sheets, lower and upper 42, 44, are of the type provided with lamellae and calibrated.
Cet empilement est déformé en périphérie du trou 13 correspondant au cylindre du moteur et les tôles inférieure et supérieure comprennent chacune un bos¬ sage 46. L'empilement est noyé dans une matrice élastomère 49 qui assure, en plus de l'étanchêité, l'adhérisation des trois tôles entre elles.This stack is deformed at the periphery of the hole 13 corresponding to the cylinder of the engine and the lower and upper sheets each comprise a bos¬ sage 46. The stack is embedded in an elastomer matrix 49 which ensures, in addition to sealing, the adhesion of the three sheets to each other.
Cette variante décrite à titre d'exemple, peut être déclinée avec tous les types de sertissures connus à ce jour, qu'il s'agisse d'une déformation simple, d'une sertissure à double profil en Ç, d'un empile¬ ment de trois tôles avec un insert médian ou bien encore avec un insert rapporté sous forme de rondel¬ le. Sur les figures 5 et 6, on a représenté deux étapes différentes d'un procédé de fabrication particulier d'un joint de culasse selon l'invention. En effet, l'empilement des trois tôles 51, 52, 53, constituant l'armature 50, est disposé dans un moule 54 dont les faces 55 et 56 sont munies respective¬ ment d'un creux 57 et d'un bossage 58 en vis à vis. L'élément de renfort, constituant la sertissure 59, est disposé sans déformation dans le moule, au droit du chant des trois tôles 51, 52, et 53. Lorsque le moule est fermé, tel que représenté sur la figure 6, l'élément de renfort, en l'occurrence la sertissure 59 est déformée pour prendre le profil ménagé entre la butée 58 et le creux 57. II convient alors d'injecter l'elastomere, qui vient adhériser les tôles entre elles et qui vient mainte¬ nir la sertissure contre le chant de ces tôles. Compte tenu de la grande précision de fabrication des moules, la sertissure doit être positionnée avec des tolérances très strictes.This variant described by way of example, can be declined with all the types of crimps known to date, whether it is a simple deformation, a crimp with a double profile in Ç, a stack ment of three sheets with a median insert or even with an insert in the form of a rondel¬. In Figures 5 and 6, there are shown two different stages of a particular manufacturing process for a cylinder head gasket according to the invention. Indeed, the stack of three sheets 51, 52, 53, constituting the frame 50, is arranged in a mold 54 whose faces 55 and 56 are provided respectively with a recess 57 and a boss 58 in opposite. The reinforcing element, constituting the crimp 59, is arranged without deformation in the mold, in line with the edge of the three sheets 51, 52, and 53. When the mold is closed, as shown in FIG. 6, the reinforcing element, in this case the crimp 59 is deformed to take the profile formed between the stop 58 and the recess 57. It is then advisable to inject the 'elastomer, which adheres the sheets together and which comes to maintain the crimp against the edge of these sheets. Taking into account the high precision of mold manufacturing, the setting must be positioned with very strict tolerances.
Sur la figure 8, on a représenté un joint de culasse 32, vu de dessus, avec les trous 13 correspondant aux cylindres, les sertissures 38, ainsi que la gar¬ niture 39. On a représenté également les trous 80, correspon¬ dant au passage des goujons, et les trous 81, cor¬ respondant au passage des fluides des circuits an¬ nexes, fluide de refroidissement ou lubrifiant, ain¬ si qu'à certains logements particuliers 82. Ce joint de culasse est représenté en coupe sur la figure 9 suivant la ligne 9-9 de la figure 8. La présente invention permet de ménager au droit des trous 81, correspondant aux circuits annexes, des joints particuliers pour les fluides. En effet, grâce au moulage, l'elastomere est déposé avec une surépaisseur à la périphérie des trous des circuits annexes. Un tel joint présente ainsi une excellente étanchéité aux fluides. D'autre part, la lèvre périphérique étant venue de moulage avec l'ensemble de la matrice élastomère, elle présente une grande résistance à l'arrachement. Les avantages du joint de culasse qui vient d'être décrit sont importants. En effet, les butées élastiques réparties, dont on peut faire varier la raideur, permettent d'éviter des déformations trop importantes d'une zone à l'au¬ tre du joint.In Figure 8, there is shown a cylinder head gasket 32, seen from above, with the holes 13 corresponding to the cylinders, the crimps 38, as well as the gar¬ niture 39. Also shown are the holes 80, corresponding to the passage of the studs, and the holes 81, corresponding to the passage of the fluids from the annexed circuits, cooling fluid or lubricant, thus only to certain particular housings 82. This cylinder head gasket is shown in section in the figure 9 along line 9-9 of Figure 8. The present invention allows to provide the right of the holes 81, corresponding to the auxiliary circuits, specific seals for fluids. Indeed, thanks to the molding, the elastomer is deposited with an extra thickness at the periphery of the holes of the auxiliary circuits. Such a seal thus has excellent fluid tightness. On the other hand, the peripheral lip having come from molding with the whole of the elastomer matrix, it has a great resistance to tearing. The advantages of the head gasket which has just been described are significant. Indeed, the distributed elastic stops, the stiffness of which can be varied, make it possible to avoid excessively large deformations of an area beyond the joint.
Enfin, la raideur étant contrôlée, cela conduit à un bon équilibrage du joint et l'on sait que le contrô- le de la raideur permet de contrôler la transmission des efforts.Finally, the stiffness being controlled, this leads to a good balancing of the joint and it is known that controlling the stiffness makes it possible to control the transmission of forces.
Ceci a pour conséquence immédiate de permettre au joint de contribuer par sa raideur à la raideur du moteur car les efforts de serrage de la culasse sur le bloc moteur sont régulièrement répartis et con¬ trôlés.This has the immediate consequence of allowing the seal to contribute by its stiffness to the stiffness of the engine because the forces for tightening the cylinder head on the engine block are regularly distributed and controlled.
Le joint selon l'invention présente également un avantage important surtout pour les moteurs à venir car il permet un excellent contrôle des épaisseurs serrées, durant la vie du joint, si bien que le vo¬ lume de la chambre de combustion ne varie pas évi¬ tant par là même des variations de la qualité de la combustion. Ceci permet de participer à la lutte contre la pollution. II est alors intéressant de rappeler que la couleur de l'elastomere peut varier et dans ce cas on peut établir un code de couleurs en fonction des épais¬ seurs, en corrélation avec la position des pistons par rapport à la tablature supérieure du bloc mo- teur. Ceci est particulièrement intéressant dans le cas de moteurs diesel.The seal according to the invention also has an important advantage, especially for future engines because it allows excellent control of tight thicknesses, during the life of the seal, so that the volume of the combustion chamber does not vary. so many variations in the quality of combustion. This makes it possible to participate in the fight against pollution. It is then interesting to recall that the color of the elastomer can vary and in this case it is possible to establish a color code as a function of the thicknesses, in correlation with the position of the pistons relative to the upper tablature of the mo block. tor. This is particularly interesting in the case of diesel engines.
En effet, l'épaisseur du joint peut varier avec un pas très fin, il suffit pour cela d'ajouter des tô¬ les de faible épaisseur qui jouent le rôle de cales lors de la fabrication de ce joint. Indeed, the thickness of the joint can vary with a very fine pitch, it suffices for this to add thin sheets which play the role of shims during the manufacture of this joint.

Claims

REVENDICATIONS
1. Joint de culasse, notamment pour moteur à combustion interne, composé d'une armature (8) com¬ portant au moins une tôle (10) métallique combinée avec une garniture (24) en matériau élastomère (25) , et possédant notamment des trous (13) correspondant aux cylindres du moteur, aux circuits annexes des fluides de refroidissement et de lubrification, ain¬ si qu'aux goujons de serrage, caractérisé en ce qu'il comprend des butées élastiques réparties (28) sur au moins une partie de la surface de ce joint.1. Cylinder head gasket, in particular for an internal combustion engine, composed of a frame (8) comprising at least one metal sheet (10) combined with a lining (24) made of elastomeric material (25), and having in particular holes (13) corresponding to the engine cylinders, to the auxiliary circuits of the cooling and lubrication fluids, as well as to the tightening studs, characterized in that it comprises elastic stops distributed (28) over at least part of the surface of this joint.
2. Joint selon la revendication 1, caracté¬ risé en ce que l'armature (8) est noyée dans le ma¬ tériau élastomère qui constitue la garniture (24) . 2. Joint according to claim 1, caracté¬ ized in that the frame (8) is embedded in the elastomer ma¬ material which constitutes the lining (24).
3. Joint selon la revendication 1 ou 2, ca¬ ractérisée en ce que les butées élastiques réparties (28) comprennent des déformations (12) élastiques ménagées dans la ou les tôles qui font saillie de part et d'autre de cette ou de chacune de ces tô- les.3. Joint according to claim 1 or 2, ca¬ acted in that the distributed elastic stops (28) comprise elastic deformations (12) formed in the sheet or sheets which project on either side of this or each of these sheets.
4. Joint selon la revendication 3, caractéri¬ sée en ce que les déformations élastiques ménagées dans la ou les tôles sont symétriques par rapport au plan médian de cette ou de chacune de ces tôles. 4. Joint according to claim 3, caractéri¬ in that the elastic deformations formed in the sheet or sheets are symmetrical with respect to the median plane of this or each of these sheets.
5. Joint selon l'une quelconque des revendi¬ cations précédentes caractérisé en ce que l'armature comprend un empilement de tôles (42, 43, 44) super¬ posées, l'une des tôle étant une tôle lisse, exempte de butée élastique et prévue pour remplir la fonction de cale.5. Joint according to any one of the preceding revendi¬ cations characterized in that the armature comprises a stack of sheets (42, 43, 44) super¬ posed, one of the sheets being a smooth sheet, free of elastic stop and intended to fulfill the function of hold.
6. Joint selon l'une quelconque des revendi¬ cations précédente caractérisée en ce que l'une au moins des tôles de l'armature comprend au moins une découpe localisée pour permettre d'ajuster la rai- deur de ce joint au droit de cette découpe. 6. Joint according to any one of the preceding revendi¬ cations characterized in that at least one of the plates of the frame comprises at least one localized cutout to allow the stiffness of this joint to be adjusted to the right of this cutting.
7. Joint selon l'une quelconque des revendi¬ cations précédente caractérisé en ce que les tôles de l'armature ont des épaisseurs variables.7. Joint according to any one of the preceding revendi¬ cations characterized in that the plates of the frame have variable thicknesses.
8. Joint selon l'une quelconque des revendi- cations précédentes, caractérisé en ce que la tôle est une tôle préalablement écrouie, munie de lamel¬ les et calibrée de façon à obtenir des déformations en S_.8. Joint according to any one of the preceding claims, characterized in that the sheet is a sheet previously hardened, provided with lamel¬ and calibrated so as to obtain deformations in S_.
9. Joint selon l'une quelconque des revendi- cations précédentes caractérisé en ce qu'il comprend au moins un élément de renfort (26, 38, 48) , dis¬ posé au droit de la périphérie de chacun trous cor¬ respondant aux cylindres et prévu notamment pour augmenter localement la raideur et la reprise des efforts.9. Seal according to any one of the preceding claims, characterized in that it comprises at least one reinforcing element (26, 38, 48), placed at right angles to the periphery of each hole corresponding to the cylinders and intended in particular to locally increase the stiffness and the resumption of efforts.
10. Joint selon la revendication 9, caracté¬ risé en ce que l'élément de renfort (42, 44) est une déformation localisée (46) de la ou des tôles compo¬ sant l'armature et/ou une sertissure. 10. Joint according to claim 9, caracté¬ ized in that the reinforcing element (42, 44) is a localized deformation (46) of the sheet or sheets comprising the frame and / or a crimp.
11. Joint selon la revendication 9, caracté¬ risé en ce que l'élément de renfort est une pièce rapportée du type insert.11. Joint according to claim 9, caracté¬ ized in that the reinforcing element is an insert of the insert type.
12. Joint selon l'une quelconque des revendi¬ cations caractérisé en ce que les tôles de l'ar a- ture sont adherisées par le matériau élastomère constituant la garniture.12. Joint according to any one of the revendi¬ cations characterized in that the sheets of the a-ture are adhered by the elastomeric material constituting the lining.
13. Joint selon la rev 11 et 12 caractérisé en ce que la pièce rapportée constituant l'élément de renfort est adhérisée à l'armature par le matériau élastomère de la garniture.13. Joint according to rev 11 and 12 characterized in that the insert constituting the reinforcing element is adhered to the frame by the elastomeric material of the lining.
14. Joint selon l'une quelconque des revendi¬ cations caractérisé en ce que la garniture (39) com¬ prend des surépaisseurs (61) locales d'étanchéité en matériau élastomère, notamment au droit des trous (81) correspondant aux circuits annexes. 14. Joint according to any one of the revendi¬ cations characterized in that the lining (39) com¬ takes extra thicknesses (61) local sealing in elastomeric material, in particular at the holes (81) corresponding to the auxiliary circuits.
15. Joint selon l'une quelconque des revendi¬ cations caractérisé en ce que la garniture est à épaisseur variable de façon à prendre en compte les déformations différentielles de la culasse et du bloc moteur lors du fonctionnement.15. Joint according to any one of the revendi¬ cations characterized in that the lining is of variable thickness so as to take into account the differential deformations of the cylinder head and of the engine block during operation.
16. Joint selon l'une quelconque des revendi¬ cations caractérisé en ce que la garniture comprend sur l'une au moins de ses deux faces des impressions de façon à améliorer la prise d'empreinte sur les plans de joint de la culasse et du bloc moteur.16. Seal according to any one of the claims, characterized in that the lining comprises, on at least one of its two faces, impressions so as to improve the impression taken on the joint surfaces of the cylinder head and of the engine block.
17. Joint selon l'une quelconque des revendi¬ cations caractérisé en ce que le matériau élastomère possède une viscosité dynamique faible, et il est choisi plus particulièrement dans la famille des silicones, de façon à permettre le remplissage des différents interstices.17. Joint according to any one of the claims, characterized in that the elastomeric material has a low dynamic viscosity, and it is chosen more particularly from the family of silicones, so as to allow the filling of the various interstices.
18. Procédé de fabrication du joint de culasse selon l'une quelconque des revendications 1 à 17 caractérisé en ce qu'il comprend les étapes suivan- tes :18. A method of manufacturing the cylinder head gasket according to any one of claims 1 to 17 characterized in that it comprises the following steps:
- déformation d'au moins une tôle ayant la forme du joint à fabriquer, de part et d'autre de son plan, pour créer une armature avec des butées élastiques réparties, - empilement éventuel de plusieurs tôles,- deformation of at least one sheet having the shape of the joint to be produced, on either side of its plane, to create a frame with distributed elastic stops, - possible stacking of several sheets,
- mise en place éventuelle d'éléments de renfort,- possible installation of reinforcing elements,
- dépôt de la garniture en matériau élastomère.- deposit of the lining in elastomeric material.
19. Procédé selon 18 caractérisé en ce que pour obtenir la déformation de la ou des tôles, on réalise des lamelles, notamment par emboutissage, on calibre la ou les tôles ainsi munies de lamelles de façon à conférer à la ou aux tôles une épaisseur libre supérieure à l'épaisseur nominale de la tôle avant déformation, les lamelles ainsi réalisées se comportant sous charge comme des ressorts. 19. A method according to 18 characterized in that to obtain the deformation of the sheet (s), lamellae are produced, in particular by stamping, the plate (s) thus provided with lamellae are calibrated so as to give the plate (s) a free thickness greater than the nominal thickness of the sheet before deformation, the strips thus produced behaving under load like springs.
20. Procédé selon la 18 ou 19 caractérisé en ce que, dans le cas où l'armature comprend un élé¬ ment de renfort et où le dépôt de la garniture est réalisé par moulage, on positionne en lieu et place cet élément de renfort, sans déformation préalable, dans le moule avec l'armature et on réalise la dé¬ formation recherchée dans le moule lui-même grâce à la pression de fermeture et au profil de ce moule. 20. Method according to 18 or 19 characterized in that, in the case where the frame comprises a reinforcing element and where the deposit of the lining is produced by molding, this reinforcing element is positioned in place and places, without prior deformation, in the mold with the frame and the desired de¬ formation is carried out in the mold itself thanks to the closing pressure and the profile of this mold.
EP92920427A 1991-09-13 1992-09-14 Cylinder head gasket, particularly for internal combustion engines, and method for manufacturing same Withdrawn EP0603318A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9111319A FR2681378B1 (en) 1991-09-13 1991-09-13 METHOD OF MANUFACTURING A SEAL AND THE SEAL OBTAINED.
FR9111319 1991-09-13
FR9202171A FR2687732B1 (en) 1992-02-25 1992-02-25 CYLINDER HEAD GASKET AND MANUFACTURING METHOD.
FR9202171 1992-02-25
PCT/FR1992/000860 WO1993006391A1 (en) 1991-09-13 1992-09-14 Cylinder head gasket, particularly for internal combustion engines, and method for manufacturing same

Publications (1)

Publication Number Publication Date
EP0603318A1 true EP0603318A1 (en) 1994-06-29

Family

ID=26228942

Family Applications (2)

Application Number Title Priority Date Filing Date
EP92920427A Withdrawn EP0603318A1 (en) 1991-09-13 1992-09-14 Cylinder head gasket, particularly for internal combustion engines, and method for manufacturing same
EP92920425A Expired - Lifetime EP0603317B1 (en) 1991-09-13 1992-09-14 Sheet gasket, particularly for internal combustion engines

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP92920425A Expired - Lifetime EP0603317B1 (en) 1991-09-13 1992-09-14 Sheet gasket, particularly for internal combustion engines

Country Status (14)

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US (2) US5639103A (en)
EP (2) EP0603318A1 (en)
JP (2) JPH06510842A (en)
AT (1) ATE145457T1 (en)
AU (2) AU666872B2 (en)
BR (2) BR9206489A (en)
CA (2) CA2118944A1 (en)
CZ (2) CZ54894A3 (en)
DE (1) DE69215379T2 (en)
HU (2) HUT69247A (en)
PL (2) PL169496B1 (en)
SK (2) SK30594A3 (en)
TW (1) TW221310B (en)
WO (2) WO1993006391A1 (en)

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Also Published As

Publication number Publication date
JPH06510843A (en) 1994-12-01
CZ54894A3 (en) 1994-08-17
SK28294A3 (en) 1995-05-10
CA2118945A1 (en) 1993-04-01
EP0603317B1 (en) 1996-11-20
EP0603317A1 (en) 1994-06-29
AU2661592A (en) 1993-04-27
US5618050A (en) 1997-04-08
HUT69247A (en) 1995-08-28
BR9206490A (en) 1995-10-17
BR9206489A (en) 1995-10-17
US5639103A (en) 1997-06-17
DE69215379T2 (en) 1997-04-03
HU9400622D0 (en) 1994-06-28
HUT66295A (en) 1994-11-28
WO1993006392A1 (en) 1993-04-01
ATE145457T1 (en) 1996-12-15
JPH06510842A (en) 1994-12-01
WO1993006391A1 (en) 1993-04-01
TW221310B (en) 1994-02-21
CZ55094A3 (en) 1994-06-15
PL169496B1 (en) 1996-07-31
DE69215379D1 (en) 1997-01-02
AU658673B2 (en) 1995-04-27
HU9400624D0 (en) 1994-06-28
AU2661792A (en) 1993-04-27
SK30594A3 (en) 1994-09-07
CA2118944A1 (en) 1993-04-01
AU666872B2 (en) 1996-02-29
PL169393B1 (en) 1996-07-31

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