EP3092394B1 - Fixed-head internal combustion engine with improved gas-tightness - Google Patents

Fixed-head internal combustion engine with improved gas-tightness Download PDF

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Publication number
EP3092394B1
EP3092394B1 EP15701564.5A EP15701564A EP3092394B1 EP 3092394 B1 EP3092394 B1 EP 3092394B1 EP 15701564 A EP15701564 A EP 15701564A EP 3092394 B1 EP3092394 B1 EP 3092394B1
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European Patent Office
Prior art keywords
spring
engine
fixed
elastic means
engine according
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EP15701564.5A
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German (de)
French (fr)
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EP3092394A1 (en
Inventor
Marek ABRAMCZUK
Frédéric JUSTET
Pascal Tribotte
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Renault SAS
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Renault SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/002—Integrally formed cylinders and cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0043—Arrangements of mechanical drive elements
    • F02F7/0053—Crankshaft bearings fitted in the crankcase
    • 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
    • F02B75/40—Other reciprocating-piston engines

Definitions

  • the invention relates to an internal combustion blind engine for a motor vehicle comprising an improved gas sealing device.
  • an internal combustion blind motor 1 is the assembly consisting of a cylinder head portion 2 and a cylinder block portion 7 in one piece obtained by molding.
  • the yoke portion 2 comprises at least one exhaust duct, said duct opening into a combustion chamber roof 26 which forms a substantially conical cavity and whose object is to improve combustion.
  • the breech part 2 comprises at least one valve which closes the access to said exhaust duct.
  • the cylinder head 2 also supports injection and ignition devices.
  • the document FR 1,420,479 A also discloses a blind engine with internal combustion.
  • the cylinder block portion 7 comprises at least one vertical cylindrical chamber 8 opening at an upper end in the cavity of the chamber roof 26 in the cylinder head portion 2 and opening in its lower end in a connecting shaft chamber 9.
  • the cylindrical chamber 8 is shaped to accommodate a cylindrical sleeve 3.
  • the crank chamber houses a crankshaft maintained along a horizontal axis by at least one crankshaft bearing 4 disposed transversely to the axis of the crankshaft.
  • the crankshaft bearing 4 is fixed on the cylinder block portion 7 by fixing devices 24 located on either side of the crankshaft bearing 4.
  • the jacket 3 is a cylindrical tube-shaped piece of metal material whose outer diameter is less than or equal to a diameter of the cylindrical chamber 8, and a length is equal to or greater than a length of the cylindrical chamber 8.
  • the jacket 3 and the cylindrical chamber 8 define between them a water chamber 21 preferably circular of the cooling circuit located in the upper part and a circular air chamber 22 of the air intake circuit , disjoined from the water chamber 21 by a prominent edge and located in the lower part.
  • the air chamber 22 comprises at least one orifice 35, pierced preferentially in an upper zone of the air chamber 22 and opening into a bore of the jacket 3, orifice 35 intended for the passage of fresh air inlet to feed the combustion chamber in the bore of said jacket 3.
  • This orifice is substantially halfway up the jacket 3.
  • the jacket 3 also comprises, on each prominent edge of the water chambers 21 and air, a circular groove 25 adapted to receive an O-ring of elastomeric material, sealing the water chambers 21 and air 22, with the exception of the orifice 35.
  • the liner 3, equipped with seals 25, is engaged in the cylindrical chamber 8 by the connecting rod chamber 9 of the engine 1. It is held in place by a pillar 5 arranged for this purpose on the crankshaft bearing 4.
  • the pillar 5 bears on a bottom end face 31 of the liner 3 during the implementation of the fixing devices 24 of the crankshaft bearing 4 on the cylinder block portion 7 of the blind motor 1.
  • one face 32 of the upper end of the jacket 3 is maintained in pressing on an edge of the cavity of the combustion chamber roof 26 in order to achieve a gastightness around the cavity of the combustion chamber roof 26, between this cavity and the water chamber 21.
  • the contact pressures at an interface 27 between the edge of the cavity 26 and the jacket 3 must be greater than a maximum combustion pressure with a certain safety coefficient that can prevail within the combustion chamber.
  • the liner 3, sandwiched between the crankshaft bearing 4 and the edge of the cavity of the combustion chamber roof 26 is compressed to provide a contact pressure necessary for sealing under all operating conditions of the engine. blind motor 1.
  • the engine block is made of aluminum and the casing 3 of cast iron, hot thermal expansion leads to a loss of tension in the assembly.
  • the cold contact pressures increase which may lead to a risk of plasticization in the bearing zone of the face 32 of the liner 3 with the edge of the cavity of the combustion chamber roof 26 and, as the reaction between the face 31 of the liner 3 and the pillar 5 of the crankshaft bearing 4 increases, a risk for the holding of the crankshaft bearing.
  • An object of the invention is to provide an internal combustion blind motor having improved gastightness while avoiding the above disadvantages.
  • a blind engine with internal combustion comprising at least one cylinder comprising a cylindrical chamber, an attached sleeve fitted into the cylindrical chamber and crankshaft bearings on which the liner is supported, the motor further comprising resilient spring means interposed between the liner and the crankshaft bearing so that the liner is supported on the crankshaft bearing via spring elastic means.
  • the resilient spring means are able to absorb the thermal expansion of the elements in contact, the source expansions of the variations between the cold contact pressures and the hot contact pressures, thus reducing the risk of rupture of the crankshaft bearing, on the one hand, and on the other hand, plasticizing the bearing zone of the upper face of the jacket.
  • the resilient spring means are attached to the crankshaft bearing.
  • a motor vehicle having a blind engine with internal combustion having at least one of the above features.
  • the elastic spring means are here in the form of a leaf spring 6.
  • This spring leaf 6 is elongated parallelepiped here with a small thickness in the other two dimensions.
  • the leaf spring 6 has, over a length, a form of humps with a boss 61 and two median ends 63,64 each comprising a substantially oblong receiving opening 62. Said opening may be, as shown in FIG. figure 3 , in the shape of a "U”.
  • the leaf spring 6 is mounted on a crankshaft bearing 40 which comprises for this purpose a pair of pillars 41 located on either side, preferably symmetrically to a vertical axis passing through and perpendicular to an axis of rotation.
  • crankshaft in the crankshaft bearing 40.
  • the pillars 41 project vertically from an upper face of the crankshaft bearing 40 towards the underside 31 of the jacket 3.
  • the pillars 41 are integral with the crankshaft 40.
  • the pillars 41 each comprise a pin 42 which, during assembly, is received in the receiving openings 62 of the leaf spring 6.
  • the liner 3 comprises at its lower end face 31 an ear 33 extending radially projecting from an outer side wall of the liner 3.
  • the lug 33 bears on a vertex of the bump 61 of the spring leaf 6.
  • the leaf spring 6 is found mounted in series between the liner 3 and the crankshaft bearing 40. In operation of the internal combustion engine blind according to the invention and equipped with the leaf spring 6, the latter is deformed elastically when thermal expansion of the jacket 3, the cylinder head part 2 and the crankshaft bearing 4.
  • the elastic spring means are present here in the form of studs 420 reported in orifices arranged for this purpose at a free end 411 of a pillar 410 of a crankshaft bearing 400. Once reported, the pads 420 extend projecting from the free end 411 of the pillar 410.
  • the pillar 410 extends projecting vertically from an upper face of the crankshaft bearing 400 towards the lower face 31 of the liner 3, and to the right of an axis of rotation of a crankshaft in the crankshaft bearing 400.
  • the pillar 410 is integral with the crankshaft bearing 400.
  • the studs 420 are, here, two in number, positioned symmetrically with a mean plane of the crankshaft bearing 400 perpendicular to the axis of rotation of the crankshaft. Such an arrangement makes it possible to interface the crankshaft bearing 400 with two adjacent jackets 3 of the blind internal combustion engine according to the invention, each stud 420 being dedicated to one of the adjacent jackets 3.
  • the jacket 3 has at its lower face 31 end of an ear 33 projecting from centrifugally protruding side wall of the sleeve 3.
  • the ear 33 has a bearing face 330.
  • the ear 33 has its face support 330 which comes into contact with a free end of one of the pads 420.
  • the pad 420 is found connected in series between the liner 3 and the crankshaft bearing 400.
  • the pad 420 is deformed in an elastic manner during the thermal expansions of the jacket 3, the cylinder head part 2 and the crankshaft bearing 4.
  • the studs 420 are here cylindrical in shape of revolution. However, they may have other forms of polygonal section or not.
  • the pads 420 are made of a thermoplastic material such as polyether-ether-ketone (PEEK) or polyamide-imide (PAI).
  • the resilient spring means comprise a "Belleville” type washer.
  • the elastic means forming a spring comprise helical springs.
  • the resilient spring means have a very low stiffness in order to compensate for the thermal expansion at hot while limiting the increase of the forces in the assembly of the various elements in the blind engine with internal combustion according to the invention.
  • the stiffness of said elastic means is preferentially less than 2000N / mm for a unit capacity of less than 500cm3.
  • Such blind internal combustion engine according to the invention is installed in a power unit of a motor vehicle.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

L'invention concerne un moteur borgne à combustion interne pour un véhicule automobile comprenant un dispositif d'étanchéité aux gaz améliorée.The invention relates to an internal combustion blind engine for a motor vehicle comprising an improved gas sealing device.

Actuellement, comme illustré à la figure 1 ainsi que dans le document FR 2 972 381 , un moteur borgne 1 à combustion interne est l'ensemble constitué d'une partie culasse 2 et d'une partie carter cylindre 7 en une seule pièce obtenue par moulage. La partie culasse 2 comporte au moins un conduit d'échappement, ledit conduit débouchant dans un toit de chambre à combustion 26 qui forme une cavité sensiblement conique et dont l'objet est d'améliorer la combustion. La partie culasse 2 comporte au moins une soupape qui ferme l'accès audit conduit d'échappement. La culasse 2 supporte également des dispositifs d'injection et d'allumage. Le document FR 1 420 479 A divulgue également un moteur borgne à combustion interne.Currently, as illustrated in figure 1 as well as in the document FR 2 972 381 , an internal combustion blind motor 1 is the assembly consisting of a cylinder head portion 2 and a cylinder block portion 7 in one piece obtained by molding. The yoke portion 2 comprises at least one exhaust duct, said duct opening into a combustion chamber roof 26 which forms a substantially conical cavity and whose object is to improve combustion. The breech part 2 comprises at least one valve which closes the access to said exhaust duct. The cylinder head 2 also supports injection and ignition devices. The document FR 1,420,479 A also discloses a blind engine with internal combustion.

La partie carter cylindre 7 comprend au moins une chambre cylindrique 8 verticale débouchant au niveau d'une extrémité haute dans la cavité du toit de chambre 26 dans la partie culasse 2 et débouchant dans son extrémité basse dans une chambre de bielle 9. La chambre cylindrique 8 est conformée pour accueillir une chemise 3 cylindrique. La chambre de bielle abrite un vilebrequin maintenu selon un axe horizontal par au moins un palier de vilebrequin 4 disposé transversalement par rapport à l'axe du vilebrequin. Le palier de vilebrequin 4 est fixé sur la partie carter cylindre 7 par des dispositifs de fixation 24 situés de part et d'autre du palier de vilebrequin 4.The cylinder block portion 7 comprises at least one vertical cylindrical chamber 8 opening at an upper end in the cavity of the chamber roof 26 in the cylinder head portion 2 and opening in its lower end in a connecting shaft chamber 9. The cylindrical chamber 8 is shaped to accommodate a cylindrical sleeve 3. The crank chamber houses a crankshaft maintained along a horizontal axis by at least one crankshaft bearing 4 disposed transversely to the axis of the crankshaft. The crankshaft bearing 4 is fixed on the cylinder block portion 7 by fixing devices 24 located on either side of the crankshaft bearing 4.

La chemise 3 est une pièce en forme de tube cylindrique en matière métallique dont un diamètre extérieur est inférieur ou égal à un diamètre de la chambre cylindrique 8, et une longueur est égale ou supérieure à une longueur de la chambre cylindrique 8. Un fois en place dans la chambre cylindrique 8, la chemise 3 et la chambre cylindrique 8 définissent entre elles une chambre d'eau 21 préférentiellement circulaire du circuit de refroidissement située en partie haute et une chambre d'air 22 circulaire du circuit d'admission d'air, disjointe de la chambre d'eau 21 par un bord proéminent et située en partie basse. Sur une paroi interne la chambre d'air 22 comporte au moins un orifice 35, percé préférentiellement dans une zone haute de la chambre d'air 22 et débouchant dans un alésage de la chemise 3, orifice 35 destiné au passage de l'air frais d'admission pour alimenter la chambre à combustion dans l'alésage de ladite chemise 3. Cet orifice est sensiblement à mi-hauteur dans la chemise 3. La chemise 3 comporte également, sur chaque bord proéminent des chambres d'eau 21 et d'air, une gorge circulaire 25 adaptée à accueillir un joint torique en matière élastomère, étanchéifiant les chambres d'eau 21 et d'air 22, exception faite de l'orifice 35.The jacket 3 is a cylindrical tube-shaped piece of metal material whose outer diameter is less than or equal to a diameter of the cylindrical chamber 8, and a length is equal to or greater than a length of the cylindrical chamber 8. Once in placed in the cylindrical chamber 8, the jacket 3 and the cylindrical chamber 8 define between them a water chamber 21 preferably circular of the cooling circuit located in the upper part and a circular air chamber 22 of the air intake circuit , disjoined from the water chamber 21 by a prominent edge and located in the lower part. On an inner wall, the air chamber 22 comprises at least one orifice 35, pierced preferentially in an upper zone of the air chamber 22 and opening into a bore of the jacket 3, orifice 35 intended for the passage of fresh air inlet to feed the combustion chamber in the bore of said jacket 3. This orifice is substantially halfway up the jacket 3. The jacket 3 also comprises, on each prominent edge of the water chambers 21 and air, a circular groove 25 adapted to receive an O-ring of elastomeric material, sealing the water chambers 21 and air 22, with the exception of the orifice 35.

Au montage, la chemise 3, équipée de joints 25, est emboitée dans la chambre cylindrique 8 par la chambre de bielle 9 bas du moteur 1. Elle est maintenue en place par un pilier 5 aménagé à cet effet sur le palier de vilebrequin 4. Le pilier 5 vient en appui sur une face 31 d'extrémité basse de la chemise 3, lors de la mise en oeuvre des dispositifs de fixation 24 du palier de vilebrequin 4 sur la partie carter cylindre 7 du moteur borgne 1. Ainsi, une face 32 d'extrémité supérieure de la chemise 3 est maintenue en appui sur un bord de la cavité du toit de chambre à combustion 26 afin de réaliser une étanchéité aux gaz autour de la cavité du toit de chambre à combustion 26, entre cette cavité et la chambre d'eau 21. Afin d'assurer cette étanchéité aux gaz, les pressions de contact à une interface 27 entre le bord de la cavité 26 et la chemise 3 doivent être supérieures à une pression de combustion maximale avec un certain coefficient de sécurité pouvant régner au sein de la chambre de combustion. La chemise 3, prise en « sandwich » entre le palier de vilebrequin 4 et le bord de la cavité du toit de chambre à combustion 26 est comprimée afin d'assurer une pression de contact nécessaire pour l'étanchéité dans toutes les conditions de fonctionnement du moteur borgne 1.On assembly, the liner 3, equipped with seals 25, is engaged in the cylindrical chamber 8 by the connecting rod chamber 9 of the engine 1. It is held in place by a pillar 5 arranged for this purpose on the crankshaft bearing 4. The pillar 5 bears on a bottom end face 31 of the liner 3 during the implementation of the fixing devices 24 of the crankshaft bearing 4 on the cylinder block portion 7 of the blind motor 1. Thus, one face 32 of the upper end of the jacket 3 is maintained in pressing on an edge of the cavity of the combustion chamber roof 26 in order to achieve a gastightness around the cavity of the combustion chamber roof 26, between this cavity and the water chamber 21. In order to ensure this seal In the case of gases, the contact pressures at an interface 27 between the edge of the cavity 26 and the jacket 3 must be greater than a maximum combustion pressure with a certain safety coefficient that can prevail within the combustion chamber. The liner 3, sandwiched between the crankshaft bearing 4 and the edge of the cavity of the combustion chamber roof 26 is compressed to provide a contact pressure necessary for sealing under all operating conditions of the engine. blind motor 1.

Etant donné que le bloc moteur est réalisé en aluminium et la chemise 3 en fonte, les dilatations thermiques à chaud conduisent à une perte de tension dans l'assemblage. Afin d'assurer une étanchéité aux gaz à chaud, il faut alors augmenter la compression de la chemise 3. Or, dans ce cas, les pressions de contact à froid croissent pouvant conduire à un risque de plastification dans la zone d'appui de la face 32 de la chemise 3 avec le bord de la cavité du toit de chambre à combustion 26 et, comme la réaction entre la face 31 de la chemise 3 et le pilier 5 du palier de vilebrequin 4 augmente, à un risque pour la tenue du palier de vilebrequin.Since the engine block is made of aluminum and the casing 3 of cast iron, hot thermal expansion leads to a loss of tension in the assembly. In order to ensure a seal against hot gases, it is then necessary to increase the compression of the jacket 3. However, in this case, the cold contact pressures increase which may lead to a risk of plasticization in the bearing zone of the face 32 of the liner 3 with the edge of the cavity of the combustion chamber roof 26 and, as the reaction between the face 31 of the liner 3 and the pillar 5 of the crankshaft bearing 4 increases, a risk for the holding of the crankshaft bearing.

Un but de l'invention est de fournir un moteur borgne à combustion interne présentant une étanchéité aux gaz améliorée tout en évitant les inconvénients précédents.An object of the invention is to provide an internal combustion blind motor having improved gastightness while avoiding the above disadvantages.

A cette fin, il est prévu, selon l'invention, un moteur borgne à combustion interne comportant au moins un cylindre comprenant une chambre cylindrique, une chemise rapportée emmanchée dans la chambre cylindrique et des paliers de vilebrequin sur lequel la chemise est en appui, le moteur comprenant en outre des moyens élastiques formant ressort interposés entre la chemise et le palier de vilebrequin de sorte que la chemise soit en appui sur le palier de vilebrequin via les moyens élastiques formant ressort.For this purpose, it is provided, according to the invention, a blind engine with internal combustion comprising at least one cylinder comprising a cylindrical chamber, an attached sleeve fitted into the cylindrical chamber and crankshaft bearings on which the liner is supported, the motor further comprising resilient spring means interposed between the liner and the crankshaft bearing so that the liner is supported on the crankshaft bearing via spring elastic means.

Ainsi, les moyens élastiques formant ressort permettent d'absorber les dilatations thermiques des éléments en contact, dilatations sources des variations entre les pressions de contact à froid et les pressions de contact à chaud, réduisant alors les risques de rupture du palier de vilebrequin, d'une part, et, d'autre part, de plastification de la zone d'appui de la face supérieure de la chemise. Les moyens élastiques formant ressort sont fixés sur le palier de vilebrequin.Thus, the resilient spring means are able to absorb the thermal expansion of the elements in contact, the source expansions of the variations between the cold contact pressures and the hot contact pressures, thus reducing the risk of rupture of the crankshaft bearing, on the one hand, and on the other hand, plasticizing the bearing zone of the upper face of the jacket. The resilient spring means are attached to the crankshaft bearing.

Avantageusement, mais facultativement, le moteur borgne à combustion interne selon l'invention comprend au moins l'une des caractéristiques techniques supplémentaire suivante :

  • les moyens élastiques formant ressort présentent une raideur faible ;
  • les moyens élastiques formant ressort comprennent un ressort à lame ;
  • les moyens élastiques formant ressort comprennent des plots souples ;
  • les plots souples sont réalisés en poly-éther-éther-cétone ou en polyamide-imide ; et,
  • les moyens élastiques formant ressort comportent une rondelle de type « Belleville ».
Advantageously, but optionally, the blind internal combustion engine according to the invention comprises at least one of the following additional technical characteristics:
  • the elastic spring means have a low stiffness;
  • the resilient spring means comprise a leaf spring;
  • the resilient spring means comprise soft pads;
  • the soft pads are made of polyether-ether-ketone or polyamide-imide; and,
  • the resilient spring means comprise a "Belleville" type washer.

Il est aussi prévu, selon l'invention, un véhicule automobile comportant un moteur borgne à combustion interne présentant au moins l'une des caractéristiques précédentes.It is also provided, according to the invention, a motor vehicle having a blind engine with internal combustion having at least one of the above features.

D'autres caractéristiques et avantages de l'invention apparaîtront lors de la description ci-après de deux modes de réalisation de l'invention. Aux dessins annexés :

  • La figure 1 est une vue en coupe d'un moteur borgne à combustion interne selon l'état de l'art ;
  • La figure 2 est une vue en trois dimensions d'un assemblage chemise/palier mettant en oeuvre un premier mode de réalisation des moyens élastiques formant ressort d'un moteur borgne selon l'invention ;
  • La figure 3 est une vue en trois dimension du premier mode de réalisation des moyens élastiques formant ressort ;
  • La figure 4 est une vue en trois dimensions d'un deuxième mode de réalisation des moyens élastiques formant ressort montés sur un palier d'un moteur borgne selon l'invention ; et,
  • La figure 5 est une vue en trois dimensions d'un assemblage chemise/palier mettant en oeuvre le deuxième mode de réalisation des moyens élastiques formant ressort d'un moteur borgne selon l'invention.
Other characteristics and advantages of the invention will appear in the description below of two embodiments of the invention. In the accompanying drawings:
  • The figure 1 is a sectional view of a blind engine with internal combustion according to the state of the art;
  • The figure 2 is a three-dimensional view of a sleeve / bearing assembly implementing a first embodiment of the elastic spring means of a blind motor according to the invention;
  • The figure 3 is a three-dimensional view of the first embodiment of spring elastic means;
  • The figure 4 is a three-dimensional view of a second embodiment of spring elastic means mounted on a bearing of a blind motor according to the invention; and,
  • The figure 5 is a three-dimensional view of a sleeve / bearing assembly implementing the second embodiment of the elastic spring means of a blind motor according to the invention.

Nous allons maintenant décrire en détails deux modes de réalisation de l'invention en référence aux figures 2 et 3, et aux figures 4 et 5 respectivement. Seuls les moyens élastiques formant ressort sont concernés par la description qui va suivre, ainsi que leur assemblage entre la chemise 3 et le palier de vilebrequin 40,400. Il est à noter que les ensembles ainsi formés sont installés dans un moteur borgne à combustion interne similaire à celui 1 qui a été décrit dans le préambule en référence à la figure 1.We will now describe in detail two embodiments of the invention with reference to figures 2 and 3 , and figures 4 and 5 respectively. Only spring elastic means are concerned by the description which follows, and their assembly between the sleeve 3 and the crankshaft bearing 40,400. Note that the assemblies thus formed are installed in a blind engine with internal combustion similar to that 1 which has been described in the preamble with reference to the figure 1 .

Selon un premier mode de réalisation du moteur borgne à combustion interne selon l'invention, les moyens de élastiques formant ressort se présentent ici sous la forme d'une lame de ressort 6. Cette lame de ressort 6 est ici parallélépipédique allongée avec une épaisseur petite au regard des deux autres dimensions. La lame de ressort 6 présente, sur une longueur, une forme de dos d'âne avec une bosse 61 médiane et deux extrémités 63,64 comprenant chacune une ouverture sensiblement oblongue de réception 62. Ladite ouverture peut être, comme représentée en figure 3, en forme de « U ». La lame de ressort 6 est montée sur un palier de vilebrequin 40 qui comprend à cet effet une paire de piliers 41 situé de part et d'autre, de préférence, de manière symétrique à un axe vertical passant par et perpendiculaire à un axe de rotation d'un vilebrequin dans le palier de vilebrequin 40. Les piliers 41 s'étendent en saillie verticalement depuis une face supérieure du palier de vilebrequin 40 en direction de la face inférieure 31 de la chemise 3. Les piliers 41 sont venus de matière avec le palier de vilebrequin 40. Au niveau d'une extrémité libre supérieur, les piliers 41 comportent, chacun, un tenon 42 qui, lors d'un montage, est reçu dans les ouvertures de réception 62 de la lame de ressort 6.According to a first embodiment of the blind internal combustion engine according to the invention, the elastic spring means are here in the form of a leaf spring 6. This spring leaf 6 is elongated parallelepiped here with a small thickness in the other two dimensions. The leaf spring 6 has, over a length, a form of humps with a boss 61 and two median ends 63,64 each comprising a substantially oblong receiving opening 62. Said opening may be, as shown in FIG. figure 3 , in the shape of a "U". The leaf spring 6 is mounted on a crankshaft bearing 40 which comprises for this purpose a pair of pillars 41 located on either side, preferably symmetrically to a vertical axis passing through and perpendicular to an axis of rotation. a crankshaft in the crankshaft bearing 40. The pillars 41 project vertically from an upper face of the crankshaft bearing 40 towards the underside 31 of the jacket 3. The pillars 41 are integral with the crankshaft 40. crankshaft bearing 40. At an upper free end, the pillars 41 each comprise a pin 42 which, during assembly, is received in the receiving openings 62 of the leaf spring 6.

La chemise 3 comporte au niveau de sa face inférieure 31 d'extrémité une oreille 33 s'étendant radialement en saillie depuis une paroi latérale externe de la chemise 3. Lors d'un montage, l'oreille 33 vient en appui sur un sommet de la bosse 61 de la lame de ressort 6. Ainsi la lame de ressort 6 se retrouve montée en série entre la chemise 3 et le palier de vilebrequin 40. En fonctionnement du moteur borgne à combustion interne selon l'invention ainsi équipé de la lame de ressort 6, cette dernière se déforme de manière élastique lors des dilatations thermiques de la chemise 3, de la partie culasse 2 et du palier de vilebrequin 4.The liner 3 comprises at its lower end face 31 an ear 33 extending radially projecting from an outer side wall of the liner 3. During assembly, the lug 33 bears on a vertex of the bump 61 of the spring leaf 6. Thus the leaf spring 6 is found mounted in series between the liner 3 and the crankshaft bearing 40. In operation of the internal combustion engine blind according to the invention and equipped with the leaf spring 6, the latter is deformed elastically when thermal expansion of the jacket 3, the cylinder head part 2 and the crankshaft bearing 4.

Maintenant, en référence aux figures 4 et 5, nous allons décrire un deuxième mode de réalisation du moteur borgne à combustion interne selon l'invention, les moyens de élastiques formant ressort se présentent, ici, sous la forme de plots 420 rapportés dans des orifices aménagés à cet effet à une extrémité libre 411 d'un pilier 410 d'un palier de vilebrequin 400. Une fois rapportés, les plots 420 s'étendent en saillie de l'extrémité libre 411 du pilier 410.Now, with reference to figures 4 and 5 , we will describe a second embodiment of the internal combustion blind engine according to the invention, the elastic spring means are present here in the form of studs 420 reported in orifices arranged for this purpose at a free end 411 of a pillar 410 of a crankshaft bearing 400. Once reported, the pads 420 extend projecting from the free end 411 of the pillar 410.

Le pilier 410 s'étend en saillie verticalement depuis une face supérieure du palier de vilebrequin 400 en direction de la face inférieure 31 de la chemise 3, et au droit d'un axe de rotation d'un vilebrequin dans le palier de vilebrequin 400. De plus, le pilier 410 est venu de matière avec le palier de vilebrequin 400.The pillar 410 extends projecting vertically from an upper face of the crankshaft bearing 400 towards the lower face 31 of the liner 3, and to the right of an axis of rotation of a crankshaft in the crankshaft bearing 400. In addition, the pillar 410 is integral with the crankshaft bearing 400.

Les plots 420 sont, ici, au nombre de deux, positionnés de manière symétrique d'un plan moyen du palier de vilebrequin 400 perpendiculaire à l'axe de rotation du vilebrequin. Une telle disposition permet d'interfacer le palier de vilebrequin 400 avec deux chemises 3 adjacentes du moteur borgne à combustion interne selon l'invention, chaque plot 420 étant dédié à une des chemises 3 adjacentes.The studs 420 are, here, two in number, positioned symmetrically with a mean plane of the crankshaft bearing 400 perpendicular to the axis of rotation of the crankshaft. Such an arrangement makes it possible to interface the crankshaft bearing 400 with two adjacent jackets 3 of the blind internal combustion engine according to the invention, each stud 420 being dedicated to one of the adjacent jackets 3.

Comme pour le mode de réalisation précédent, la chemise 3 comporte au niveau de sa face inférieure 31 d'extrémité une oreille 33 s'étendant en saillie de manière centrifuge depuis une paroi latérale radialement externe de la chemise 3. L'oreille 33 présente une face d'appui 330. Lors d'un montage, l'oreille 33 a sa face d'appui 330 qui vient en contact avec une extrémité libre de l'un des plots 420. Ainsi le plot 420 se retrouve monté en série entre la chemise 3 et le palier de vilebrequin 400. En fonctionnement du moteur borgne à combustion interne selon l'invention ainsi équipé du plot 420, ce dernier se déforme de manière élastique lors des dilatations thermiques de la chemise 3, de la partie culasse 2 et du palier de vilebrequin 4.As for the previous embodiment, the jacket 3 has at its lower face 31 end of an ear 33 projecting from centrifugally protruding side wall of the sleeve 3. The ear 33 has a bearing face 330. During an assembly, the ear 33 has its face support 330 which comes into contact with a free end of one of the pads 420. Thus the pad 420 is found connected in series between the liner 3 and the crankshaft bearing 400. In operation of the blind engine with internal combustion according to the invention. invention thus equipped with the pad 420, the latter is deformed in an elastic manner during the thermal expansions of the jacket 3, the cylinder head part 2 and the crankshaft bearing 4.

Les plots 420 sont ici de forme cylindrique de révolution. Toutefois, ils peuvent présenter d'autres formes de section polygonale ou non. D'autre part, les plots 420 sont réalisés dans un matériau thermoplastique comme du poly-éther-éther-cétone (PEEK) ou du polyamide-imide (PAI).The studs 420 are here cylindrical in shape of revolution. However, they may have other forms of polygonal section or not. On the other hand, the pads 420 are made of a thermoplastic material such as polyether-ether-ketone (PEEK) or polyamide-imide (PAI).

Dans une variante de réalisation, les moyens élastiques formant ressort comportent une rondelle de type « Belleville ».In an alternative embodiment, the resilient spring means comprise a "Belleville" type washer.

Dans une autre variante de réalisation, les moyens élastiques formant un ressort comportent des ressorts de type hélicoïdal.In another variant embodiment, the elastic means forming a spring comprise helical springs.

De manière générale, les moyens élastiques formant ressort présentent une très faible raideur afin de compenser la dilatation thermique à chaud tout en limitant l'accroissement des efforts dans l'assemblage des différents éléments dans le moteur borgne à combustion interne selon l'invention. La raideur desdits moyens élastiques est de façon préférentielle inférieure à 2000N/mm pour une cylindrée unitaire inférieure à 500cm3.In general, the resilient spring means have a very low stiffness in order to compensate for the thermal expansion at hot while limiting the increase of the forces in the assembly of the various elements in the blind engine with internal combustion according to the invention. The stiffness of said elastic means is preferentially less than 2000N / mm for a unit capacity of less than 500cm3.

Un tel moteur borgne à combustion interne selon l'invention est installé dans un groupe motopropulseur d'un véhicule automobile.Such blind internal combustion engine according to the invention is installed in a power unit of a motor vehicle.

Bien entendu, il est possible d'apporter à l'invention de nombreuses modifications sans pour autant sortir du cadre de celle-ci.Of course, it is possible to bring to the invention many modifications without departing from the scope thereof.

Claims (9)

  1. Fixed-head internal combustion engine (1) comprising at least one cylinder (7) having a cylindrical chamber (8) disposed in a casing, an applied lining (3) inserted in the cylindrical chamber, and a bearing element fixed to the casing (4; 40; 400) on which the lining rests, characterized in that the engine also comprises elastic means (6; 420) forming a spring, placed between the lining and the bearing element fixed to the casing so that the lining rests on said bearing element fixed to the casing via the elastic means forming a spring and in that the engine has at least one crankshaft bearing fixed to the casing and forming the bearing element fixed to the casing.
  2. Engine according to Claim 1, characterized in that the elastic means forming a spring are fixed to the bearing element fixed to the casing.
  3. Engine according to either one of Claims 1 and 2, characterized in that the elastic means forming a spring have a very low rigidity.
  4. Engine according to any one of Claims 1 to 3, characterized in that the elastic means forming a spring comprise a leaf spring (6).
  5. Engine according to any one of Claims 1 to 3, characterized in that the elastic means forming a spring comprise flexible contact pins (420).
  6. Engine according to Claim 5, characterized in that the flexible contact pins are made of polyether ether ketone or polyamide imide.
  7. Engine according to any one of Claims 1 to 3, characterized in that the elastic means forming a spring comprise a washer of the "Belleville" type.
  8. Engine according to any one of Claims 1 to 3, characterized in that the elastic means forming a spring comprise springs of the coil type.
  9. Motor vehicle comprising a heat engine, characterized in that the heat engine is a fixed-head engine according to any one of Claims 1 to 8.
EP15701564.5A 2014-01-10 2015-01-12 Fixed-head internal combustion engine with improved gas-tightness Active EP3092394B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1450172A FR3016404B1 (en) 2014-01-10 2014-01-10 INTERNAL COMBUSTION BORGINE MOTOR WITH ENHANCED GAS SEALING
PCT/FR2015/050060 WO2015104515A1 (en) 2014-01-10 2015-01-12 Fixed-head internal combustion engine with improved gas-tightness

Publications (2)

Publication Number Publication Date
EP3092394A1 EP3092394A1 (en) 2016-11-16
EP3092394B1 true EP3092394B1 (en) 2017-11-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15701564.5A Active EP3092394B1 (en) 2014-01-10 2015-01-12 Fixed-head internal combustion engine with improved gas-tightness

Country Status (4)

Country Link
EP (1) EP3092394B1 (en)
BR (1) BR112016015775B1 (en)
FR (1) FR3016404B1 (en)
WO (1) WO2015104515A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2203885A (en) * 1938-04-16 1940-06-11 Messerschmitt Boelkow Blohm Liner for internal combustion engines
FR1405930A (en) * 1964-06-01 1965-07-16 Renault Improvement in the assembly of cylinder liners for internal combustion engines
FR1420479A (en) * 1964-10-26 1965-12-10 Cefilac New process for fixing the cylinder liners of an engine and resulting new industrial products
US3882842A (en) * 1974-01-28 1975-05-13 Caterpillar Tractor Co Cylinder liner support
US6848399B2 (en) * 2003-05-30 2005-02-01 Electrolux Home Products, Inc. Scavenging insert for an engine
FR2972381B1 (en) 2011-03-08 2014-02-21 Renault Sa ENGINE BORGNE SHIRT REPORTED BY THE BELOW

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR3016404A1 (en) 2015-07-17
EP3092394A1 (en) 2016-11-16
FR3016404B1 (en) 2018-08-10
WO2015104515A1 (en) 2015-07-16
BR112016015775A2 (en) 2017-08-08
BR112016015775B1 (en) 2023-01-10

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