WO2019234337A1 - Multifunctional assembly including a synchronisation panel for guiding a combustion piston in a variable compression ratio engine - Google Patents

Multifunctional assembly including a synchronisation panel for guiding a combustion piston in a variable compression ratio engine Download PDF

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Publication number
WO2019234337A1
WO2019234337A1 PCT/FR2019/051300 FR2019051300W WO2019234337A1 WO 2019234337 A1 WO2019234337 A1 WO 2019234337A1 FR 2019051300 W FR2019051300 W FR 2019051300W WO 2019234337 A1 WO2019234337 A1 WO 2019234337A1
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WO
WIPO (PCT)
Prior art keywords
flange
cylinder block
assembly
combustion
opening
Prior art date
Application number
PCT/FR2019/051300
Other languages
French (fr)
Inventor
Matthieu DUCHEMIN
Sylvain Bigot
Benoit SCHWENCK
Maxence PISTER
Original Assignee
MCE 5 Development
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MCE 5 Development filed Critical MCE 5 Development
Priority to CN201980044131.0A priority Critical patent/CN112334643A/en
Publication of WO2019234337A1 publication Critical patent/WO2019234337A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B9/00—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups
    • F01B9/04—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft
    • F01B9/047—Reciprocating-piston machines or engines characterised by connections between pistons and main shafts and not specific to preceding groups with rotary main shaft other than crankshaft with rack and pinion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
    • F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length

Definitions

  • the present invention relates to a variable compression ratio engine comprising a rolling guide device of a combustion piston. It relates in particular to a multifunctional assembly including a synchronization plate of said guiding device.
  • Document FR3029977 discloses a variable volumetric ratio engine 150 for improving its overall energy efficiency and thus making it more economical.
  • the transmission system may have the various elements illustrated in Figure la.
  • the combustion piston 2, movable in translation in the combustion cylinder 110 is integral with a transmission member 3; the latter transmits, on the one hand, the movement of the piston 2 to the crankshaft 9 by means of a toothed wheel 5, and on the other hand, bears during its translational movements on a guiding device 4.
  • FIGS. 1b and 1c show a guiding device 4 of the state of the art, comprising a synchronization plate 41, integral with the cylinder block 100. It consists of a first rolling track 48 and a first rack 46, in two parts, disposed on either side of the raceway 48.
  • a synchronization roller 40 ensures the cooperation between the synchronization plate 41 and the transmission member 3.
  • the synchronization plate 41 of the guiding device 4 must be accurately positioned in the defined opening of the cylinder block 100 to cooperate with the transmission member 3 via the synchronization roller 40 It must also be formed of steel to withstand the mechanical stresses transmitted by said member 3.
  • a synchronization plate 41 therefore usually has a large thickness of steel to ensure its rigidity in view of the stresses applied to it and to allow its effective fixing on the cylinder block 100.
  • FIGS. 1d and 1c show an exemplary embodiment of FIG. timing plates 41 for a cylinder block having three combustion cylinders.
  • the cylinder block 100 is usually made of a material whose expansion coefficient is different from that of the steel, the plates 41 are separated and the fixing mode is configured to allow differential expansion between the cylinder block 100 and the cylinders. plates 41, so as not to generate deformation of the assembly during temperature changes.
  • Such a configuration has the disadvantage of a large mass due to the large amount of steel needed to form the synchronization plates 41.
  • An object of the invention is to propose a solution that overcomes at least part of the disadvantages of the state of the art.
  • An object of the invention is a variable compression ratio engine comprising a multifunctional assembly including at least one synchronization plate.
  • the object of the invention proposes a variable compression ratio engine comprising a cylinder block defining at least one combustion cylinder for accommodating a combustion piston and comprising at least one a device for guiding the combustion piston requiring a synchronization plate positioned in an opening of the cylinder block and secured to the latter.
  • the engine according to the invention comprises a multifunctional assembly including
  • a closing flange fixed to the cylinder block, for closing said opening
  • the synchronization stage (s) is (are) fixed on the flange to form the multifunctional assembly.
  • This assembly is then directly attached to the cylinder block, firstly to position and maintain the synchronization plate in the opening of the cylinder block, by which the plate cooperates with the transmission member, and secondly to close said opening.
  • the mounting steps on the cylinder block are thus simplified.
  • the flange of the multifunctional assembly being chosen to ensure the rigidity of the assembly, it is no longer necessary that the synchronization plate has a large thickness. Even if the material of which it is formed must have a hardness sufficient not to undergo deformation because of the mechanical stresses applied by the transmission member, its thickness can be significantly reduced because the plate is held on a rigid flange.
  • the material of the flange can be chosen to have a lower density relative to that of the platen, it is possible to reduce the overall mass of the engine.
  • the flange is formed of a metallic material whose thermal expansion coefficient is chosen equal to that of the cylinder block on which it is assembled;
  • the synchronization plate is formed of a material able to withstand high rolling contact pressures, generally a metallic material with a hardness greater than 60 HRC, in particular steel, and has a thickness of less than 15 mm, or even less than 10 mm, the rigidity of the assembly being ensured by the flange;
  • the flange comprises a plurality of centering devices on its internal face, for positioning the flange on the cylinder block;
  • the flange comprises a plurality of positioning elements on its internal face, for positioning the (at least one) synchronization plate on the flange;
  • the multifunctional assembly comprises a solenoid valve supported by the flange;
  • the multifunctional assembly comprises at least one oil channel formed in the flange, the channel opening on at least one nozzle for sprinkling the combustion piston with the oil to cool it.
  • FIGS. 1a to 1b present an engine block and elements of this engine block according to the state of the technique
  • FIGS. 2a and 2b show a multifunctional assembly for a variable compression ratio engine according to the invention
  • FIGS. 3a and 3b show a cylinder block with the multifunctional assembly, for variable compression ratio engine according to the invention
  • Figure 4 shows an exploded view of a multifunctional assembly for variable compression ratio engine according to the invention.
  • the invention relates to a variable compression ratio engine comprising a cylinder block 100 defining at least one combustion cylinder 110 to accommodate a combustion piston
  • the engine also comprises at least one guiding device 4, associated with (at least one) combustion piston 2.
  • the guiding device 4 as stated in the state of the art, requires a synchronization plate 41 to cooperate with a integral transmission member of the combustion piston 2.
  • the synchronizing plate 41 must be positioned precisely in an opening of the cylinder block 100 and remain attached to the latter.
  • the engine comprises a multifunctional assembly 200 (FIGS. 2a and 2b).
  • This assembly 200 includes a closure flange 210 which has an outer face 201 and an inner face 202.
  • the closure flange 210 of the assembly 200 is fixed to the cylinder block 100 by screwing, the inner face 202 being oriented towards the inside of the cylinder block 100.
  • the flange 210 serves in particular to close the opening 180 of the cylinder block 100 ( Figure 3a and 3b).
  • the flange 210 has a seal disposed on its inner face 202, against a peripheral shoulder 212 visible in Figure 2b. The seal, in contact with the cylinder block 100 when the flange 210 is fixed thereto, seals the mechanical connection between the two parts.
  • the flange 210 is formed of a metallic material whose thermal expansion coefficient is advantageously chosen equal to that of the cylinder block 100 on which it is assembled. In general, the same materials as the cylinder block 100, in particular aluminum, will be chosen. The cylinder block operating at temperatures ranging from -30 ° C to + 140 ° C, it is subjected to thermal expansion. The opening 180 being closed by the flange 210, it is advantageous that the materials of the flange 210 and the cylinder block 100 have the same coefficients of expansion, otherwise the whole will be deformed under the effect of differential expansion. .
  • the multifunctional assembly 200 also includes the synchronization plate (s) 41, fixed (s) on the inner face 202 of the flange 210 by screwing. In the example illustrated in FIG. 2b, the multifunctional assembly 200 comprises three synchronization plates 41.
  • Fixing the plate 41 on the flange 210 can be made independently of the manufacturing and mounting steps of the cylinder block 100: the multifunctional assembly 200 according to the invention thus simplifies the mounting steps on the cylinder block 100, a only fixing step of said assembly 200 being required to secure the closing flange 210 and the synchronization plate 41.
  • the synchronization plate 41 is formed of a material capable of withstanding high rolling contact pressures; it is preferably formed of a metallic material of hardness greater than 60 HRC, in particular steel. The rigidity of the assembly 200 being provided by the flange 210, it is no longer necessary that the synchronization plate 41 has a large thickness.
  • the plate 41 may have a thickness of less than 15 mm, or even less than 10 mm.
  • the configuration of the multifunctional assembly 200 limits the mass of steel forming the (or) platinum (s) synchronization 41.
  • the rigidity of the assembly 200 is provided by the flange 210, formed in a material of lesser density such as aluminum: thus, the total mass of the assembly 200 is less than that of the parts proposed in the state of the art to perform the functions of closing the opening 180 and positioning and maintaining platinum (s) of synchronization.
  • the flange 210 has a plurality of centerers 213 on its inner face 202, to position the flange 210 on the cylinder block 100.
  • the centralizers 213 make it possible to precisely dispose the multifunctional assembly 200 relative to the opening 180 of the cylinder block 100.
  • the flange 210 comprises a plurality of positioning elements 214 on its inner face 202, to precisely position the (or) timing plate (s) 41 on the flange 210 ( Figure 4).
  • the multifunctional assembly 200 can fulfill other functions to simplify the manufacture of the cylinder block 100.
  • the multifunctional assembly 200 may include a solenoid valve 215, supported by the flange 210 ( Figure 2a). It makes it possible to control the injection of cooling fluid for the combustion piston.
  • the multifunctional assembly 200 may also include at least one fluid channel (eg, oil) formed in the flange 210 and in communication with the solenoid valve 215.
  • the channel opens onto one (or more) nozzle (s) 216 for (s) sprinkling the combustion piston 2 with engine oil to cool it.
  • the solenoid valve 215 is supported or integrated in the cylinder block 100; the fluid channel is also formed in the cylinder block 100.
  • To remove one or the other of these elements or these two elements in or on the flange 210 of the multifunctional assembly 200 according to the invention makes it possible to simplify the manufacture of the cylinder block 100, while retaining all the functions.
  • the invention is not limited to the embodiments described and variations can be made without departing from the scope of the invention as defined by the claims.

Abstract

The invention relates to a variable compression ratio engine comprising a cylinder block which defines at least one combustion cylinder for accommodating a combustion piston, and comprising at least one device for guiding the combustion piston requiring a synchronisation panel (41) positioned in an opening of the cylinder block and rigidly connected to the latter. The engine includes a multifunctional assembly (200) including: • a closure flange (210) attached to the cylinder block for closing said opening; • the synchronisation panel (41), which is attached to an inner face (202) of the flange (210), the rigidity of the assembly (200) being ensured by the flange (210).

Description

ASSEMBLAGE MULTIFONCTIONNEL INCLUANT UNE PLATINE DE  MULTIFUNCTIONAL ASSEMBLY INCLUDING A PLATINUM OF
SYNCHRONISATION POUR LE GUIDAGE D'UN PISTON DE COMBUSTION DANS  SYNCHRONIZATION FOR GUIDING A COMBUSTION PISTON IN
UN MOTEUR A TAUX DE COMPRESSION VARIABLE  A VARIABLE COMPRESSION RATE ENGINE
DOMAINE DE L' INVENTION FIELD OF THE INVENTION
La présente invention est relative à un moteur à taux de compression variable comprenant un dispositif de guidage à roulement d'un piston de combustion. Elle concerne en particulier un assemblage multifonctionnel incluant une platine de synchronisation dudit dispositif de guidage. The present invention relates to a variable compression ratio engine comprising a rolling guide device of a combustion piston. It relates in particular to a multifunctional assembly including a synchronization plate of said guiding device.
ARRIERE PLAN TECHNOLOGIQUE DE L ' INVENTION BACKGROUND OF THE INVENTION
On connaît du document FR3029977 un moteur 150 à rapport volumétrique variable visant à améliorer son rendement énergétique global et donc à le rendre plus économe. Document FR3029977 discloses a variable volumetric ratio engine 150 for improving its overall energy efficiency and thus making it more economical.
Dans ce type de moteur, le système de transmission peut présenter les différents éléments illustrés sur la figure la. En particulier, le piston de combustion 2, mobile en translation dans le cylindre de combustion 110, est solidaire d'un organe de transmission 3 ; ce dernier transmet, d'une part, le mouvement du piston 2 au vilebrequin 9 par l'intermédiaire d'une roue dentée 5, et d'autre part, prend appui au cours de ses mouvements de translation sur un dispositif de guidage 4.  In this type of engine, the transmission system may have the various elements illustrated in Figure la. In particular, the combustion piston 2, movable in translation in the combustion cylinder 110, is integral with a transmission member 3; the latter transmits, on the one hand, the movement of the piston 2 to the crankshaft 9 by means of a toothed wheel 5, and on the other hand, bears during its translational movements on a guiding device 4.
Les figures lb et le présentent un dispositif de guidage 4 de l'état de la technique, comprenant une platine de synchronisation 41, solidaire du bloc-cylindres 100. Elle est constituée d'une première piste de roulement 48 et d'une première crémaillère 46, en deux parties, disposées de part et d'autre de la piste de roulement 48. Un rouleau de synchronisation 40 assure la coopération entre la platine de synchronisation 41 et l'organe de transmission 3. Selon l'état de la technique, la platine de synchronisation 41 du dispositif de guidage 4 doit être positionnée de manière précise dans l'ouverture définie du bloc-cylindres 100 pour coopérer avec l'organe de transmission 3, via le rouleau de synchronisation 40. Elle doit également être formée en acier pour supporter les contraintes mécaniques transmises par ledit organe 3. FIGS. 1b and 1c show a guiding device 4 of the state of the art, comprising a synchronization plate 41, integral with the cylinder block 100. It consists of a first rolling track 48 and a first rack 46, in two parts, disposed on either side of the raceway 48. A synchronization roller 40 ensures the cooperation between the synchronization plate 41 and the transmission member 3. According to the state of the art, the synchronization plate 41 of the guiding device 4 must be accurately positioned in the defined opening of the cylinder block 100 to cooperate with the transmission member 3 via the synchronization roller 40 It must also be formed of steel to withstand the mechanical stresses transmitted by said member 3.
Une platine de synchronisation 41 présente donc habituellement une forte épaisseur d'acier pour assurer sa rigidité en vue des contraintes qui lui sont appliquées et pour permettre sa fixation efficace sur le bloc-cylindres 100. Les figures ld et le présentent un exemple de réalisation de platines de synchronisation 41 pour un bloc-cylindres comportant trois cylindres de combustion.  A synchronization plate 41 therefore usually has a large thickness of steel to ensure its rigidity in view of the stresses applied to it and to allow its effective fixing on the cylinder block 100. FIGS. 1d and 1c show an exemplary embodiment of FIG. timing plates 41 for a cylinder block having three combustion cylinders.
Le bloc-cylindres 100 étant habituellement réalisé dans un matériau dont le coefficient de dilatation est différent de celui de l'acier, les platines 41 sont séparées et le mode de fixation est configuré pour autoriser une dilatation différentielle entre le bloc-cylindres 100 et les platines 41, de manière à ne pas générer de déformation de l'ensemble lors des variations de température. Une telle configuration présente notamment l'inconvénient d'une masse importante du fait de la quantité importante d'acier nécessaire pour former les platines de synchronisation 41.  The cylinder block 100 is usually made of a material whose expansion coefficient is different from that of the steel, the plates 41 are separated and the fixing mode is configured to allow differential expansion between the cylinder block 100 and the cylinders. plates 41, so as not to generate deformation of the assembly during temperature changes. Such a configuration has the disadvantage of a large mass due to the large amount of steel needed to form the synchronization plates 41.
Il est également nécessaire dans un moteur selon l'état de la technique de fixer une plaque de fermeture 190 au-dessus des platines de synchronisation 41, qui a pour fonction de fermer de manière étanche l'ouverture du bloc-cylindres 100 par laquelle les platines de synchronisation 41 ont été positionnées. La solidarisation de cette plaque 190 vient ajouter des étapes de montage sur le bloc-cylindres 100, en plus de celles déjà mises en œuvre pour les plaques de synchronisation 41, et augmente donc le temps de fabrication du moteur. It is also necessary in a motor according to the state of the art to fix a closure plate 190 above the synchronization plates 41, whose function is to seal the opening of the cylinder block 100 through which the timing plates 41 have been positioned. The fastening of this plate 190 comes to add mounting steps on the cylinder block 100, in addition to those already implemented for the synchronization plates 41, and therefore increases the manufacturing time of the engine.
OBJET DE L' INVENTION Un but de l'invention est de proposer une solution remédiant au moins en partie aux inconvénients de l'état de la technique. Un objet de l'invention est un moteur à taux de compression variable comprenant un assemblage multifonctionnel incluant au moins une platine de synchronisation. OBJECT OF THE INVENTION An object of the invention is to propose a solution that overcomes at least part of the disadvantages of the state of the art. An object of the invention is a variable compression ratio engine comprising a multifunctional assembly including at least one synchronization plate.
BREVE DESCRIPTION DE L' INVENTION BRIEF DESCRIPTION OF THE INVENTION
En vue de la réalisation de l'un de ces buts, l'objet de l'invention propose un moteur à taux de compression variable comprenant un bloc-cylindres définissant au moins un cylindre de combustion pour accueillir un piston de combustion et comprenant au moins un dispositif de guidage du piston de combustion nécessitant une platine de synchronisation positionnée dans une ouverture du bloc-cylindres et solidaire de ce dernier. Le moteur selon l'invention comprend un assemblage multifonctionnel incluant In order to achieve one of these aims, the object of the invention proposes a variable compression ratio engine comprising a cylinder block defining at least one combustion cylinder for accommodating a combustion piston and comprising at least one a device for guiding the combustion piston requiring a synchronization plate positioned in an opening of the cylinder block and secured to the latter. The engine according to the invention comprises a multifunctional assembly including
• Une bride de fermeture fixée au bloc-cylindres, pour fermer ladite ouverture ; • A closing flange fixed to the cylinder block, for closing said opening;
• La platine de synchronisation, fixée sur une face interne de la bride, la rigidité de l'assemblage étant assurée par la bride .  • The synchronization plate, fixed on an internal face of the flange, the rigidity of the assembly being ensured by the flange.
La (ou les) platine (s) de synchronisation est (sont) fixée (s) sur la bride pour former l'assemblage multifonctionnel. Cet assemblage est ensuite directement fixé sur le bloc-cylindres, d'une part pour positionner et maintenir la platine de synchronisation dans l'ouverture du bloc-cylindres, par laquelle la platine coopère avec l'organe de transmission, et d'autre part pour fermer ladite ouverture. Les étapes de montage sur le bloc- cylindres sont ainsi simplifiées. The synchronization stage (s) is (are) fixed on the flange to form the multifunctional assembly. This assembly is then directly attached to the cylinder block, firstly to position and maintain the synchronization plate in the opening of the cylinder block, by which the plate cooperates with the transmission member, and secondly to close said opening. The mounting steps on the cylinder block are thus simplified.
Par ailleurs, la bride de l'assemblage multifonctionnel étant choisie pour assurer la rigidité de l'assemblage, il n'est plus nécessaire que la platine de synchronisation présente une forte épaisseur. Même si le matériau dont elle est formée doit présenter une dureté suffisante pour ne pas subir de déformation du fait des contraintes mécaniques appliquées par l'organe de transmission, son épaisseur peut être significativement réduite car la platine est maintenue sur une bride rigide. Le matériau de la bride pouvant être choisi de manière à présenter une densité moindre par rapport à celui de la platine, il est possible de diminuer la masse globale du moteur. Furthermore, the flange of the multifunctional assembly being chosen to ensure the rigidity of the assembly, it is no longer necessary that the synchronization plate has a large thickness. Even if the material of which it is formed must have a hardness sufficient not to undergo deformation because of the mechanical stresses applied by the transmission member, its thickness can be significantly reduced because the plate is held on a rigid flange. The material of the flange can be chosen to have a lower density relative to that of the platen, it is possible to reduce the overall mass of the engine.
Selon d'autres caractéristiques avantageuses et non limitatives de l'invention, prises seules ou selon toute combinaison techniquement réalisable : According to other advantageous and nonlimiting features of the invention, taken alone or in any technically feasible combination:
• la bride est formée en un matériau métallique, dont le coefficient de dilatation thermique est choisi égal à celui du bloc-cylindres sur lequel elle est assemblée ; The flange is formed of a metallic material whose thermal expansion coefficient is chosen equal to that of the cylinder block on which it is assembled;
• la platine de synchronisation est formée en un matériau apte à supporter de fortes pressions de contact de roulement, en général un matériau métallique de dureté supérieure à 60 HRC, en particulier en acier, et présente une épaisseur inférieure à 15 mm, voire inférieure à 10 mm, la rigidité de l'assemblage étant assurée par la bride ;  The synchronization plate is formed of a material able to withstand high rolling contact pressures, generally a metallic material with a hardness greater than 60 HRC, in particular steel, and has a thickness of less than 15 mm, or even less than 10 mm, the rigidity of the assembly being ensured by the flange;
• la bride ferme l'ouverture du bloc-cylindres de manière étanche ;  • the flange closes the opening of the cylinder block tightly;
• la bride comporte une pluralité de centreurs sur sa face interne, pour positionner la bride sur le bloc-cylindres ; The flange comprises a plurality of centering devices on its internal face, for positioning the flange on the cylinder block;
• la bride comporte une pluralité d'éléments de positionnement sur sa face interne, pour positionner la (au moins une) platine de synchronisation sur la bride ; The flange comprises a plurality of positioning elements on its internal face, for positioning the (at least one) synchronization plate on the flange;
• l'assemblage multifonctionnel comprend une électrovanne supportée par la bride ;  The multifunctional assembly comprises a solenoid valve supported by the flange;
• l'assemblage multifonctionnel comprend au moins un canal d'huile formé dans la bride, le canal débouchant sur au moins un gicleur destiné à arroser le piston de combustion avec l'huile pour le refroidir.  • The multifunctional assembly comprises at least one oil channel formed in the flange, the channel opening on at least one nozzle for sprinkling the combustion piston with the oil to cool it.
BREVE DESCRIPTION DES DESSINS D'autres caractéristiques et avantages de l'invention ressortiront de la description détaillée de l'invention qui va suivre en référence aux figures annexées sur lesquelles : les figures la à le présentent un bloc moteur et des éléments de ce bloc moteur selon l'état de la technique ; BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the invention will emerge from the detailed description of the invention which will follow with reference to the appended figures in which: FIGS. 1a to 1b present an engine block and elements of this engine block according to the state of the technique;
• les figures 2a et 2b présentent un assemblage multifonctionnel pour moteur à taux de compression variable conforme à l'invention ; FIGS. 2a and 2b show a multifunctional assembly for a variable compression ratio engine according to the invention;
• les figures 3a et 3b présentent un bloc-cylindres avec l'assemblage multifonctionnel, pour moteur à taux de compression variable conforme à l'invention ; FIGS. 3a and 3b show a cylinder block with the multifunctional assembly, for variable compression ratio engine according to the invention;
• la figure 4 présente une vue éclatée d'un assemblage multifonctionnel pour moteur à taux de compression variable conforme à l'invention. • Figure 4 shows an exploded view of a multifunctional assembly for variable compression ratio engine according to the invention.
DESCRIPTION DETAILLEE DE L' INVENTION DETAILED DESCRIPTION OF THE INVENTION
Par souci de simplification de la description à venir, les mêmes références sont utilisées pour des éléments identiques ou assurant la même fonction dans les modes de réalisation de l'invention ou selon l'état de la technique. For the sake of simplification of the description to come, the same references are used for identical elements or ensuring the same function in the embodiments of the invention or according to the state of the art.
L'invention concerne un moteur à taux de compression variable comprenant un bloc-cylindres 100 définissant au moins un cylindre de combustion 110 pour accueillir un piston de combustionThe invention relates to a variable compression ratio engine comprising a cylinder block 100 defining at least one combustion cylinder 110 to accommodate a combustion piston
2. 2.
Le moteur comprend également au moins un dispositif de guidage 4, associé au (au moins un) piston de combustion 2. Le dispositif de guidage 4, comme énoncé dans l'état de la technique, nécessite une platine de synchronisation 41 pour coopérer avec un organe de transmission solidaire du piston de combustion 2. La platine de synchronisation 41 doit être positionnée précisément dans une ouverture du bloc-cylindres 100 et demeurer solidaire de ce dernier. The engine also comprises at least one guiding device 4, associated with (at least one) combustion piston 2. The guiding device 4, as stated in the state of the art, requires a synchronization plate 41 to cooperate with a integral transmission member of the combustion piston 2. The synchronizing plate 41 must be positioned precisely in an opening of the cylinder block 100 and remain attached to the latter.
Selon l'invention, le moteur comprend un assemblage multifonctionnel 200 (figures 2a et 2b) . Cet assemblage 200 inclut une bride de fermeture 210 qui présente une face externe 201 et une face interne 202. According to the invention, the engine comprises a multifunctional assembly 200 (FIGS. 2a and 2b). This assembly 200 includes a closure flange 210 which has an outer face 201 and an inner face 202.
La bride de fermeture 210 de l'assemblage 200 est fixée au bloc-cylindres 100 par vissage, la face interne 202 étant orientée vers l'intérieur du bloc-cylindres 100. The closure flange 210 of the assembly 200 is fixed to the cylinder block 100 by screwing, the inner face 202 being oriented towards the inside of the cylinder block 100.
La bride 210 a notamment pour fonction de fermer l'ouverture 180 du bloc-cylindres 100 (figure 3a et 3b) . Avantageusement, pour assurer l'étanchéité de la fermeture, la bride 210 comporte un joint disposé sur sa face interne 202, contre un épaulement périphérique 212 visible sur la figure 2b. Le joint, en contact avec le bloc-cylindres 100 lorsque la bride 210 est fixée sur celui-ci, rend étanche la liaison mécanique entre les deux pièces .  The flange 210 serves in particular to close the opening 180 of the cylinder block 100 (Figure 3a and 3b). Advantageously, to seal the closure, the flange 210 has a seal disposed on its inner face 202, against a peripheral shoulder 212 visible in Figure 2b. The seal, in contact with the cylinder block 100 when the flange 210 is fixed thereto, seals the mechanical connection between the two parts.
La bride 210 est formée en un matériau métallique, dont le coefficient de dilatation thermique est avantageusement choisi égal à celui du bloc-cylindres 100 sur lequel elle est assemblée. On choisira en général les mêmes matériaux que le bloc-cylindres 100, en particulier de l'aluminium. Le bloc-cylindres opérant sous des températures variant de -30°C à +140°C, il est soumis aux dilatations thermiques. L'ouverture 180 étant fermée par la bride 210, il est avantageux que les matériaux de la bride 210 et du bloc-cylindres 100 présentent les mêmes coefficients de dilatation, sous peine de voir l'ensemble se déformer sous l'effet de dilatation différentielle. The flange 210 is formed of a metallic material whose thermal expansion coefficient is advantageously chosen equal to that of the cylinder block 100 on which it is assembled. In general, the same materials as the cylinder block 100, in particular aluminum, will be chosen. The cylinder block operating at temperatures ranging from -30 ° C to + 140 ° C, it is subjected to thermal expansion. The opening 180 being closed by the flange 210, it is advantageous that the materials of the flange 210 and the cylinder block 100 have the same coefficients of expansion, otherwise the whole will be deformed under the effect of differential expansion. .
Par ailleurs, l'épaisseur et la conformation de la bride 210 sont choisies de manière à ce que celle-ci garantisse la rigidité de l'assemblage 200. A titre d'exemple, la bride 210 pourra présenter une épaisseur de l'ordre de 2 cm dans sa zone centrale de plus forte épaisseur. L'assemblage multifonctionnel 200 inclut également la (ou les) platine (s) de synchronisation 41, fixée (s) sur la face interne 202 de la bride 210 par vissage. Dans l'exemple illustré sur la figure 2b, l'assemblage multifonctionnel 200 comprend trois platines de synchronisation 41. Furthermore, the thickness and the conformation of the flange 210 are chosen so that it guarantees the rigidity of the assembly 200. By way of example, the flange 210 may have a thickness of the order of 2 cm in its central area of greater thickness. The multifunctional assembly 200 also includes the synchronization plate (s) 41, fixed (s) on the inner face 202 of the flange 210 by screwing. In the example illustrated in FIG. 2b, the multifunctional assembly 200 comprises three synchronization plates 41.
La fixation de la platine 41 sur la bride 210 peut être faite indépendamment des étapes de fabrication et de montage du bloc-cylindres 100 : l'assemblage multifonctionnel 200 selon l'invention simplifie ainsi les étapes de montage sur le bloc- cylindres 100, une seule étape de fixation dudit assemblage 200 étant requise pour solidariser la bride 210 de fermeture et la platine de synchronisation 41. Fixing the plate 41 on the flange 210 can be made independently of the manufacturing and mounting steps of the cylinder block 100: the multifunctional assembly 200 according to the invention thus simplifies the mounting steps on the cylinder block 100, a only fixing step of said assembly 200 being required to secure the closing flange 210 and the synchronization plate 41.
La platine de synchronisation 41 est formée en un matériau apte à supporter de fortes pressions de contact de roulement ; elle est préférentiellement formée en un matériau métallique de dureté supérieure à 60 HRC, en particulier en acier. La rigidité de l'assemblage 200 étant assurée par la bride 210, il n'est plus nécessaire que la platine de synchronisation 41 présente une forte épaisseur. La platine 41 peut présenter une épaisseur inférieure à 15 mm, voire inférieure 10 mm. The synchronization plate 41 is formed of a material capable of withstanding high rolling contact pressures; it is preferably formed of a metallic material of hardness greater than 60 HRC, in particular steel. The rigidity of the assembly 200 being provided by the flange 210, it is no longer necessary that the synchronization plate 41 has a large thickness. The plate 41 may have a thickness of less than 15 mm, or even less than 10 mm.
Même si le matériau dont elle est formée doit présenter une dureté suffisante pour ne pas subir de déformation du fait des contraintes mécaniques appliquées par l'organe de transmission, son épaisseur peut être significativement réduite car la platine de synchronisation 41 est maintenue sur une bride 210 rigide.  Even if the material of which it is formed must have a hardness sufficient to avoid being deformed because of the mechanical stresses applied by the transmission member, its thickness can be significantly reduced because the synchronization plate 41 is held on a flange 210 rigid.
La configuration de l'assemblage multifonctionnel 200 permet de limiter la masse d'acier formant la (ou les) platine (s) de synchronisation 41. La rigidité de l'assemblage 200 est assurée par la bride 210, formée dans un matériau de moindre densité tel que l'aluminium : ainsi, la masse totale de l'assemblage 200 est moindre par rapport à celle des pièces proposées dans l'état de la technique pour assurer les fonctions de fermeture de l'ouverture 180 et de positionnement et maintien de platine (s) de synchronisation . Dans un mode de réalisation avantageux, la bride 210 comporte une pluralité de centreurs 213 sur sa face interne 202, pour positionner la bride 210 sur le bloc-cylindres 100. Rappelons qu'il est important que la (ou les) platine de synchronisation 41 soit positionnée de manière précise pour coopérer efficacement avec l'organe de transmission solidaire du piston de combustion. Les centreurs 213 permettent de disposer précisément l'assemblage multifonctionnel 200 relativement à l'ouverture 180 du bloc- cylindres 100. The configuration of the multifunctional assembly 200 limits the mass of steel forming the (or) platinum (s) synchronization 41. The rigidity of the assembly 200 is provided by the flange 210, formed in a material of lesser density such as aluminum: thus, the total mass of the assembly 200 is less than that of the parts proposed in the state of the art to perform the functions of closing the opening 180 and positioning and maintaining platinum (s) of synchronization. In an advantageous embodiment, the flange 210 has a plurality of centerers 213 on its inner face 202, to position the flange 210 on the cylinder block 100. Remember that it is important that the (or) synchronization plate 41 is positioned accurately to cooperate effectively with the integral transmission member of the combustion piston. The centralizers 213 make it possible to precisely dispose the multifunctional assembly 200 relative to the opening 180 of the cylinder block 100.
De plus, la bride 210 comporte une pluralité d'éléments de positionnement 214 sur sa face interne 202, pour positionner précisément la (ou les) platine (s) de synchronisation 41 sur la bride 210 (figure 4) . In addition, the flange 210 comprises a plurality of positioning elements 214 on its inner face 202, to precisely position the (or) timing plate (s) 41 on the flange 210 (Figure 4).
Selon un mode avantageux de mise en œuvre, l'assemblage multifonctionnel 200 peut remplir encore d'autres fonctions pour simplifier la fabrication du bloc-cylindres 100. According to an advantageous mode of implementation, the multifunctional assembly 200 can fulfill other functions to simplify the manufacture of the cylinder block 100.
En effet, l'assemblage multifonctionnel 200 peut inclure une électrovanne 215, supportée par la bride 210 (figure 2a) . Elle permet de piloter l'injection de fluide de refroidissement pour le piston de combustion.  Indeed, the multifunctional assembly 200 may include a solenoid valve 215, supported by the flange 210 (Figure 2a). It makes it possible to control the injection of cooling fluid for the combustion piston.
L'assemblage multifonctionnel 200 peut également inclure au moins un canal de fluide (par exemple, d'huile) formé dans la bride 210 et en communication avec l'électrovanne 215. Le canal débouche sur un (ou plusieurs) gicleur (s) 216 destiné (s) à arroser le piston de combustion 2 avec de l'huile moteur pour le refroidir.  The multifunctional assembly 200 may also include at least one fluid channel (eg, oil) formed in the flange 210 and in communication with the solenoid valve 215. The channel opens onto one (or more) nozzle (s) 216 for (s) sprinkling the combustion piston 2 with engine oil to cool it.
Dans les moteurs de l'état de la technique, l'électrovanne 215 est supportée ou intégrée au bloc-cylindres 100 ; le canal de fluide est également formé dans le bloc-cylindres 100. Déporter l'un ou l'autre de ces éléments ou ces deux éléments dans ou sur la bride 210 de l'assemblage multifonctionnel 200 selon l'invention permet de simplifier la fabrication du bloc-cylindres 100, tout en conservant l'intégralité des fonctions. Bien entendu, l'invention n'est pas limitée aux modes de mise en œuvre décrits et on peut y apporter des variantes de réalisation sans sortir du cadre de l'invention tel que défini par les revendications. In the engines of the state of the art, the solenoid valve 215 is supported or integrated in the cylinder block 100; the fluid channel is also formed in the cylinder block 100. To remove one or the other of these elements or these two elements in or on the flange 210 of the multifunctional assembly 200 according to the invention makes it possible to simplify the manufacture of the cylinder block 100, while retaining all the functions. Of course, the invention is not limited to the embodiments described and variations can be made without departing from the scope of the invention as defined by the claims.

Claims

REVENDICATIONS
1. Moteur à taux de compression variable comprenant un bloc- cylindres (100) définissant au moins un cylindre de combustion pour accueillir un piston de combustion, et comprenant au moins un dispositif de guidage du piston de combustion nécessitant une platine de synchronisation (41) positionnée dans une ouverture (180) du bloc-cylindres (100) et solidaire de ce dernier, le moteur comprenant un assemblage multifonctionnel (200) incluant : A variable compression ratio engine comprising a cylinder block (100) defining at least one combustion cylinder for accommodating a combustion piston, and comprising at least one combustion piston guiding device requiring a synchronization plate (41). positioned in an opening (180) of the cylinder block (100) and integral with the latter, the engine comprising a multifunctional assembly (200) including:
• Une bride de fermeture (210) fixée au bloc-cylindres • A closing flange (210) attached to the cylinder block
(100), pour fermer ladite ouverture (180) ;(100) for closing said opening (180);
• La platine de synchronisation (41), fixée sur une face interne (202) de la bride (210), la rigidité de l'assemblage (200) étant assurée par la bride (210)• The synchronization plate (41), fixed on an inner face (202) of the flange (210), the rigidity of the assembly (200) being provided by the flange (210)
• Au moins un canal d'huile formé dans la bride (210), le canal débouchant sur au moins un gicleur (216) destiné à arroser le piston de combustion avec l'huile pour le refroidir . • At least one oil channel formed in the flange (210), the channel opening on at least one nozzle (216) for sprinkling the combustion piston with the oil to cool it.
2. Moteur à taux de combustion variable selon la revendication précédente, dans lequel la bride (210) est formée en un matériau métallique, dont le coefficient de dilatation thermique est choisi égal à celui du bloc-cylindres (100) sur lequel elle est assemblée . 2. variable combustion rate engine according to the preceding claim, wherein the flange (210) is formed of a metallic material whose thermal expansion coefficient is chosen equal to that of the cylinder block (100) on which it is assembled .
3. Moteur à taux de combustion variable selon l'une des revendications précédentes, dans lequel la platine de synchronisation (41) est formée en un matériau métallique de dureté supérieure à 60 HRC, en particulier en acier, et présente une épaisseur inférieure a 15 mm, la rigidité de l'assemblage (200) étant assurée par la bride (210). 3. variable combustion engine according to one of the preceding claims, wherein the synchronization plate (41) is formed of a metallic material of hardness greater than 60 HRC, in particular steel, and has a thickness less than 15 mm, the rigidity of the assembly (200) being provided by the flange (210).
4. Moteur à taux de combustion variable selon l'une des revendications précédentes, dans lequel la bride (210) ferme l'ouverture (180) de manière étanche. 4. variable combustion engine according to one of the preceding claims, wherein the flange (210) closes the opening (180) sealingly.
5. Moteur à taux de combustion variable selon l'une des revendications précédentes, dans lequel la bride (210) comporte une pluralité de centreurs (213) sur sa face interne (202), pour positionner la bride (210) sur le bloc-cylindres (100). 5. variable combustion rate engine according to one of the preceding claims, wherein the flange (210) comprises a plurality of centralizers (213) on its inner face (202), for positioning the flange (210) on the block- cylinders (100).
6. Moteur à taux de combustion variable selon la revendication précédente dans lequel la bride (210) comporte une pluralité d'éléments de positionnement (214) sur sa face interne (202), pour positionner la (au moins une) platine de synchronisation (41) sur la bride (210) . 6. variable combustion rate engine according to the preceding claim wherein the flange (210) comprises a plurality of positioning elements (214) on its inner face (202), for positioning the (at least one) synchronization plate ( 41) on the flange (210).
7. Moteur à taux de combustion variable selon l'une des revendications précédentes, dans lequel l'assemblage multifonctionnel (200) comprend une électrovanne (215) supportée par la bride (210) . The variable combustion rate engine according to one of the preceding claims, wherein the multifunctional assembly (200) comprises a solenoid valve (215) supported by the flange (210).
PCT/FR2019/051300 2018-06-04 2019-06-03 Multifunctional assembly including a synchronisation panel for guiding a combustion piston in a variable compression ratio engine WO2019234337A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201980044131.0A CN112334643A (en) 2018-06-04 2019-06-03 Multifunctional assembly comprising a synchronization plate for guiding a combustion piston in a variable compression ratio engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1854810A FR3081928B1 (en) 2018-06-04 2018-06-04 MULTIFUNCTIONAL ASSEMBLY INCLUDING A TIMING PLATE FOR GUIDING A COMBUSTION PISTON IN A VARIABLE COMPRESSION RATE ENGINE
FR1854810 2018-06-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB221477A (en) * 1923-09-06 1925-02-12 Karl Gustaf Oestberg Improvements in or relating to piston engines
FR2867515A1 (en) * 2004-03-11 2005-09-16 Vianney Rabhi Oil clearance regulating device for internal combustion engine block, has shim to regulate oil clearance of transmission device, cylinder piston rod with spherical section and ball and socket joint between control rod and engine block
FR3029977A1 (en) 2014-12-12 2016-06-17 MCE 5 Development DEVICE FOR TRANSMITTING AN ENGINE, IN PARTICULAR FOR A VARIABLE COMPRESSION AND / OR CYLINDER RATE ENGINE.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2896535B1 (en) * 2006-01-26 2008-05-02 Vianney Rabhi OIL PROJECTION COOLING AND LUBRICATION DEVICE FOR VARIABLE VOLUMETRIC RATIO ENGINE
CN101487414A (en) * 2009-02-16 2009-07-22 重庆隆鑫机车有限公司 Forced cooling oil way structure of engine piston

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB221477A (en) * 1923-09-06 1925-02-12 Karl Gustaf Oestberg Improvements in or relating to piston engines
FR2867515A1 (en) * 2004-03-11 2005-09-16 Vianney Rabhi Oil clearance regulating device for internal combustion engine block, has shim to regulate oil clearance of transmission device, cylinder piston rod with spherical section and ball and socket joint between control rod and engine block
FR3029977A1 (en) 2014-12-12 2016-06-17 MCE 5 Development DEVICE FOR TRANSMITTING AN ENGINE, IN PARTICULAR FOR A VARIABLE COMPRESSION AND / OR CYLINDER RATE ENGINE.

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FR3081928B1 (en) 2021-01-15
CN112334643A (en) 2021-02-05

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