EP1781434B1 - Noice reduction cylinder block - Google Patents

Noice reduction cylinder block Download PDF

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Publication number
EP1781434B1
EP1781434B1 EP05770967A EP05770967A EP1781434B1 EP 1781434 B1 EP1781434 B1 EP 1781434B1 EP 05770967 A EP05770967 A EP 05770967A EP 05770967 A EP05770967 A EP 05770967A EP 1781434 B1 EP1781434 B1 EP 1781434B1
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EP
European Patent Office
Prior art keywords
cylinder block
longitudinal
casings
bores
internal combustion
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.)
Not-in-force
Application number
EP05770967A
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German (de)
French (fr)
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EP1781434A2 (en
Inventor
Cyril Peronnet
Alain Guffroy
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PSA Automobiles SA
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Peugeot Citroen Automobiles SA
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Publication of EP1781434A2 publication Critical patent/EP1781434A2/en
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Publication of EP1781434B1 publication Critical patent/EP1781434B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/103—Multipart cores

Definitions

  • the invention relates to an internal combustion engine cylinder block and to an engine comprising such a cylinder block.
  • the invention more particularly relates to a cylinder block comprising, an upper part comprising a plurality of cylindrical bores aligned in a longitudinal direction, a water envelope surrounding them, and a lower part, such as a skirt, delimiting a volume for a crankshaft mechanism.
  • the combustion noises radiated by an internal combustion engine are functions of this combustion (which is the excitatory phenomenon) and the dynamic response (vibrations) of the Moto-Propulsion Group to this excitation.
  • An object of the present invention is to overcome all or part of the disadvantages of the prior art noted above.
  • the cylinder block according to the invention is essentially characterized in that at least one of the two longitudinal faces of the cylinder block comprises at least a first set of boxes forming non communicating with each other and having a common outer wall extending continuously over a portion of the length of a longitudinal face.
  • Each set or row of boxes constitutes a longitudinal line.
  • the vertical spaces delimiting the partitions of the caissons form a series of vertical reinforcements.
  • the boxes have a thickness of between 15 and 30 mm approximately.
  • the zone covered by each set of boxes extends over a length of at least two-thirds, and preferably at least three-quarters, of the length of the longitudinal face of the housing, and each set of boxes has a height of between 3 and about 20% of the height of the longitudinal faces.
  • the housing comprises at least two rows of boxes (ie 4 sets), a first row being for example located substantially at the transition between the bores for accommodating the pistons and the lower part of the cylinder block (or skirt) defining the volume for the crankshaft mechanism and a second row preferably located substantially mid-height of the lower part of the cylinder block.
  • a particularly simple embodiment of the invention consists in modifying the central core used for molding the housing to form a series of excrescences which will delimit the volumes of the boxes. Under these conditions, caissons are advantageously obtained whose interior spaces communicate locally with the internal volume of the cylinder block, but without the caissons communicating with each other.
  • the invention also relates to an internal combustion engine comprising a cylinder block according to any one of the preceding characteristics.
  • the figure 4 represents a perspective view of a cylinder block according to the variant illustrated in FIG. figure 2 .
  • the figure 1 illustrates a cylinder block 1 of an internal combustion engine according to a preferred embodiment of the invention.
  • the cylinder block 1 of a generally parallelepipedal general shape - comprises an upper portion 2 having a plurality of cylindrical bores 3 vertical which are aligned in a longitudinal direction.
  • the bores 3 delimit the engine cylinders intended to accommodate pistons.
  • a water jacket 4 is formed in the upper part so as to surround the bores 3.
  • the cylinder block 1 also includes a lower portion 5, such as a skirt, and defining a volume for a crankshaft mechanism (not shown).
  • the upper 2 and lower 5 parts are made of a metallic material and are integrally molded.
  • this cylinder block is delimited vertically by an upper face intended to accommodate a not shown cylinder head and a lower face for accommodating an oil sump for example.
  • it is delimited laterally by two longitudinal faces located on either side of the alignment of the cylindrical bores 3 and two transverse faces.
  • the longitudinal faces are sometimes called respectively "intake face” and “exhaust face”, with reference to the path of the fresh gases and burned relative to the cylinders.
  • each of the longitudinal faces of the cylinder block 1 comprises two longitudinal lines 6.7.
  • Each line is actually constituted by the juxtaposition of a series of boxes having a common outer wall, but with a series of vertical walls which form partitions.
  • the thickness of this external wall is between about 4 and 5 mm.
  • the inner chamber defined by a box has a thickness typically between 15 and 30 mm.
  • each row has a width of, for example, between 3 and 20% of the height of the longitudinal faces (width for example between 30 and 80 mm).
  • Each row of boxes is preferably parallel to the alignment direction of the cylindrical bores 3. More precisely, the assemblies 6, 7 are preferably parallel to the upper and lower faces of the cylinder block 1.
  • each row is partitioned, the outer wall is continuous so that each set extends continuously over substantially the entire length of the longitudinal faces of the cylinder block 1.
  • the sets can extend continuously over two-thirds. , and preferably at least three quarters, of the length of the longitudinal face.
  • the longitudinal rows are preferably centered on the median part of the longitudinal face.
  • the cylinder block is provided with twice two longitudinal rows, with a first row 6 located substantially halfway up the lower portion 5 of the cylinder block. This imparts better transverse rigidity to the skirts, thus improving their bending behavior.
  • a second row 7 is preferably disposed substantially at the level of the transition between the upper and lower portions 5 of the cylinder block 1, that is to say at the connection between the drums (cylinders 3). and the skirt of the engine.
  • This longitudinal line 7 allows better solidarity between the upper and lower portions 5 of the cylinder block 1 and improves the behavior thereof when subjected to torsional forces.
  • the invention thus allows a structural strengthening of the cylinder block 1 and a reduction of noise radiated by the engine when it is subjected to torsional and / or bending forces.
  • the noise generated by the vibration of the block 1 are reduced by 2 to 3dB with respect to the known cylinder blocks.
  • Noise attenuation is particularly important around frequencies between 2500 and 2700 Hz and between 1000 and 1800 Hz.
  • a third row 8 is provided.
  • the partitions delimiting two consecutive boxes of the same row also constitute vertical lines arranged regularly along the longitudinal sides of the cylinder block. These lines are oriented from bottom to top on the cylinder block.
  • the figure 3 illustrates an arrangement of a plurality of cores used in a molding process that can be advantageously used for producing cylinder blocks according to the invention. According to the exemplary embodiment illustrated very schematically on this figure 3 four cylinder block arrangements are aligned in a mold.
  • the arrangements of cores are associated in pairs.
  • the arrangements of each pair are contiguous lower face against lower face - that is to say, there are two clusters of two cylinder blocks joined to their base.
  • Each nucleus is provided with a series of excrescences.

Abstract

The invention relates to a cylinder block (1) for an internal combustion engine, consisting of: an upper part (2) comprising a plurality of cylindrical bores (3) which are aligned along a longitudinal axis and a water sleeve (3) which surrounds the bores; and a lower part (4) such as a skirt, which defines a space for a crankshaft mechanism. The inventive cylinder block (1) comprises two longitudinal faces which are disposed on either side of the line of cylindrical bores (3) and at least one of said faces is equipped with at least one shell assembly, said shell assembly forming chambers which are not connected to one another and comprising an outer common wall which extends continuously along part of the length of one longitudinal face. The invention also relates to an internal combustion engine comprising one such cylinder block, as well as a moulding method for producing such cylinder blocks.

Description

L'invention se rapporte à un bloc-cylindres de moteur à combustion interne ainsi qu'à un moteur comportant un tel bloc cylindres.The invention relates to an internal combustion engine cylinder block and to an engine comprising such a cylinder block.

L'invention concerne plus particulièrement un bloc-cylindres comprenant, une partie supérieure comportant une pluralité d'alésages cylindriques alignés selon une direction longitudinale, une enveloppe à eau entourant ceux-ci, et une partie inférieure, telle qu'une jupe, délimitant un volume pour un mécanisme de vilebrequin.The invention more particularly relates to a cylinder block comprising, an upper part comprising a plurality of cylindrical bores aligned in a longitudinal direction, a water envelope surrounding them, and a lower part, such as a skirt, delimiting a volume for a crankshaft mechanism.

Les bruits de combustion rayonnés par un moteur à combustion interne sont fonctions de cette combustion (qui est le phénomène excitateur) et de la réponse dynamique (vibrations) du Groupe Moto-Propulseur à cette excitation.The combustion noises radiated by an internal combustion engine are functions of this combustion (which is the excitatory phenomenon) and the dynamic response (vibrations) of the Moto-Propulsion Group to this excitation.

Les moteurs sont soumis à des normes de pollution de plus en plus sévères qui sont très contraignantes pour la mise au point de la combustion. De ce fait, le potentiel de réduction du bruit de combustion par la mise au point de la combustion elle-même est de plus en plus réduit.Engines are subject to increasingly stringent pollution standards that are very restrictive for the development of combustion. As a result, the potential for reducing combustion noise by developing the combustion itself is increasingly reduced.

Pour cette raison, il est connu de proposer des modifications d'architecture du moteur pour mieux maîtriser son rayonnement acoustique. Les solutions connues sont cependant peu satisfaisantes en terme de réduction du bruit généré par le moteur et/ou impliquent des modifications d'architecture complexes souvent incompatibles avec une production à grande échelle. On connait de DE 4324609 un bloc-cylindres de moteur dont la partie supérieure comporte une pluralité d'alésages cylindriques alignés selon une direction longitudinale et une enveloppe à eau entourant ceux-ci. La partie inférieure du bloc-cylindres forme une jupe qui délimite un volume pour le mécanisme de vilebrequin. Le bloc-cylindres comporte deux face longitudinales situées de part et d'autre de l'alignement des alésages cylindriques.For this reason, it is known to propose engine architecture modifications to better control its acoustic radiation. The known solutions are, however, unsatisfactory in terms of noise reduction generated by the engine and / or involve complex architectural modifications often incompatible with large-scale production. We know DE 4324609 a motor cylinder block whose upper part comprises a plurality of cylindrical bores aligned in a longitudinal direction and a water envelope surrounding them. The lower part of the cylinder block forms a skirt which delimits a volume for the crankshaft mechanism. The cylinder block has two longitudinal faces located on either side of the alignment of the cylindrical bores.

Un but de la présente invention est de pallier tout ou partie des inconvénients de l'art antérieur relevés ci-dessus.An object of the present invention is to overcome all or part of the disadvantages of the prior art noted above.

A cette fin, le bloc-cylindres selon l'invention, par ailleurs conforme à la définition générique qu'en donne le préambule ci-dessus, ,est essentiellement caractérisé en ce qu'au moins une des deux faces longitudinales du bloc-cylindres comporte au moins un premier ensemble de caissons formant des chambres non communicantes entre elles et disposant d'une paroi externe commune s'étendant sans discontinuité sur une partie de la longueur d'une face longitudinale.To this end, the cylinder block according to the invention, furthermore in accordance with the generic definition given in the preamble above, is essentially characterized in that at least one of the two longitudinal faces of the cylinder block comprises at least a first set of boxes forming non communicating with each other and having a common outer wall extending continuously over a portion of the length of a longitudinal face.

Chaque ensemble ou rangée de caissons constitue une ligne longitudinale. Par ailleurs les espaces verticaux délimitant les cloisons des caissons forment une série de renforts verticaux.Each set or row of boxes constitutes a longitudinal line. In addition, the vertical spaces delimiting the partitions of the caissons form a series of vertical reinforcements.

De préférence, les caissons ont une épaisseur comprise entre 15 et 30 mm environ. La zone couverte par chaque ensemble de caissons s'étend sur une longueur d'au moins deux tiers, et de préférence au moins trois quarts, de la longueur de la face longitudinale du carter, et chaque ensemble de caissons a une hauteur comprise entre 3 et 20% environ de la hauteur des faces longitudinales.Preferably, the boxes have a thickness of between 15 and 30 mm approximately. The zone covered by each set of boxes extends over a length of at least two-thirds, and preferably at least three-quarters, of the length of the longitudinal face of the housing, and each set of boxes has a height of between 3 and about 20% of the height of the longitudinal faces.

Dans un arrangement particulièrement préféré, le carter comporte au moins deux rangées de caissons (soit 4 ensembles), une première rangée étant par exemple située sensiblement au niveau de la transition entre les alésages destinés à accueillir les pistons et la partie inférieure du bloc-cylindres (ou jupe) délimitant le volume pour le mécanisme de vilebrequin et une seconde rangée située de préférence sensiblement à mi-hauteur de la partie inférieure du bloc-cylindres.In a particularly preferred arrangement, the housing comprises at least two rows of boxes (ie 4 sets), a first row being for example located substantially at the transition between the bores for accommodating the pistons and the lower part of the cylinder block (or skirt) defining the volume for the crankshaft mechanism and a second row preferably located substantially mid-height of the lower part of the cylinder block.

Un moyen particulièrement simple de réalisation de l'invention consiste à modifier le noyau central utilisé pour le moulage du carter pour former une série d'excroissances qui vont délimiter les volumes des caissons. Dans ces conditions, on obtient avantageusement des caissons dont les espaces intérieurs communiquent localement avec le volume intérieur du bloc-cylindres, mais sans que les caissons ne communiquent entre eux.A particularly simple embodiment of the invention consists in modifying the central core used for molding the housing to form a series of excrescences which will delimit the volumes of the boxes. Under these conditions, caissons are advantageously obtained whose interior spaces communicate locally with the internal volume of the cylinder block, but without the caissons communicating with each other.

L'invention a également pour objet un moteur à combustion interne comportant un bloc-cylindres conforme à l'une quelconque des caractéristiques précédentes.The invention also relates to an internal combustion engine comprising a cylinder block according to any one of the preceding characteristics.

D'autres particularités et avantages apparaîtront à la lecture de la description ci-après, faite en référence aux figures dans lesquelles :

  • la figure 1 est une vue en perspective d'un bloc-cylindres selon l'invention, coupé transversalement selon un plan passant par alésage de cylindre ;
  • la figure 2 représente une vue en perspective d'un bloc-cylindres selon une variante de l'invention
  • la figure 3 est une vue schématique d'un exemple d'agencement d'un noyau de fonderie monobloc adapté pour permettre le moulage du bloc-cylindres selon l'invention.
Other particularities and advantages will appear on reading the following description, made with reference to the figures in which:
  • the figure 1 is a perspective view of a cylinder block according to the invention cut transversely in a plane passing through a cylinder bore;
  • the figure 2 represents a perspective view of a cylinder block according to a variant of the invention
  • the figure 3 is a schematic view of an exemplary arrangement of a one-piece foundry core adapted to allow the molding of the cylinder block according to the invention.

La figure 4, représente une vue en perspective d'un bloc cylindre conforme à la variante illustrée à la figure 2.The figure 4 , represents a perspective view of a cylinder block according to the variant illustrated in FIG. figure 2 .

La figure 1 illustre un bloc-cylindres 1 de moteur à combustion interne selon un exemple de réalisation préféré de l'invention.The figure 1 illustrates a cylinder block 1 of an internal combustion engine according to a preferred embodiment of the invention.

Classiquement, le bloc-cylindres 1- d'une forme générale essentiellement parallélépipédique - comprend une partie supérieure 2 comportant une pluralité d'alésages cylindriques 3 verticaux qui sont alignés selon une direction longitudinale. Les alésages 3 délimitent les cylindres du moteur destinés à accueillir des pistons. Une enveloppe à eau 4 est ménagée dans la partie supérieure de façon à entourer les alésages 3.Conventionally, the cylinder block 1 of a generally parallelepipedal general shape - comprises an upper portion 2 having a plurality of cylindrical bores 3 vertical which are aligned in a longitudinal direction. The bores 3 delimit the engine cylinders intended to accommodate pistons. A water jacket 4 is formed in the upper part so as to surround the bores 3.

Le bloc-cylindres 1 comprend également une partie inférieure 5, telle qu'une jupe, et délimitant un volume pour un mécanisme de vilebrequin (non représenté).The cylinder block 1 also includes a lower portion 5, such as a skirt, and defining a volume for a crankshaft mechanism (not shown).

De préférence, les parties supérieure 2 et inférieure 5 sont constituées d'un matériau métallique et sont moulées de façon monobloc. En considérant ce bloc- cylindres comme un parallélépipède, il est délimité verticalement par une face supérieure destinée à accueillir une culasse non représentée et par une face inférieure destinée à accueillir un carter d'huile par exemple. De même, il est délimité latéralement par deux faces longitudinales situées de part et d'autre de l'alignement des alésages cylindriques 3 et deux faces transversales. Les faces longitudinales sont appelées quelquefois respectivement "face admission" et "face échappement", en référence au trajet des gaz frais et brûlés par rapport aux cylindres.Preferably, the upper 2 and lower 5 parts are made of a metallic material and are integrally molded. Considering this cylinder block as a parallelepiped, it is delimited vertically by an upper face intended to accommodate a not shown cylinder head and a lower face for accommodating an oil sump for example. Similarly, it is delimited laterally by two longitudinal faces located on either side of the alignment of the cylindrical bores 3 and two transverse faces. The longitudinal faces are sometimes called respectively "intake face" and "exhaust face", with reference to the path of the fresh gases and burned relative to the cylinders.

Dans l'exemple de réalisation de l'invention représenté à la figure 1, chacune des faces longitudinales du bloc-cylindres 1 comporte deux lignes 6,7 longitudinales. Chaque ligne est en fait constituée par la juxtaposition d'une série de caissons ayant une paroi externe commune, mais avec une série de parois verticales qui forment des cloisons.In the exemplary embodiment of the invention shown in figure 1 each of the longitudinal faces of the cylinder block 1 comprises two longitudinal lines 6.7. Each line is actually constituted by the juxtaposition of a series of boxes having a common outer wall, but with a series of vertical walls which form partitions.

Dans une variante de l'invention tout particulièrement préférée, l'épaisseur de cette paroi externe est comprise entre 4 et 5 mm environ. La chambre intérieure définie par un caisson a une épaisseur typiquement comprise entre 15 et 30 mm.In a variant of the invention that is particularly preferred, the thickness of this external wall is between about 4 and 5 mm. The inner chamber defined by a box has a thickness typically between 15 and 30 mm.

La distance entre deux rangées adjacentes (par exemple entre la rangée située sur la partie supérieure et la rangée située en partie inférieure) peut être comprise entre 4 et 80 mm par exemple. De plus, chaque rangée a une largeur comprise, par exemple, entre 3 et 20% environ de la hauteur des faces longitudinales (largeur comprise par exemple entre 30 et 80 mm).The distance between two adjacent rows (for example between the row located on the upper part and the row located in the lower part) may be between 4 and 80 mm for example. In addition, each row has a width of, for example, between 3 and 20% of the height of the longitudinal faces (width for example between 30 and 80 mm).

Chaque rangée de caissons est de préférence parallèle à la direction d'alignement des alésages cylindriques 3. Plus précisément, les ensembles 6,7 sont de préférence parallèles aux faces supérieure et inférieure du bloc-cylindres 1.Each row of boxes is preferably parallel to the alignment direction of the cylindrical bores 3. More precisely, the assemblies 6, 7 are preferably parallel to the upper and lower faces of the cylinder block 1.

Même si chaque rangée est cloisonnée, la paroi externe est continue de sorte que chaque ensemble s'étend sans discontinuité sur sensiblement toute la longueur des faces longitudinales du bloc-cylindres 1. Cependant, les ensembles peuvent s'étendre de façon continue sur deux tiers, et de préférence au moins trois quarts, de la longueur de la face longitudinale. Dans ce cas, les rangées longitudinales sont de préférence centrées sur la partie médiane de la face longitudinale.Even if each row is partitioned, the outer wall is continuous so that each set extends continuously over substantially the entire length of the longitudinal faces of the cylinder block 1. However, the sets can extend continuously over two-thirds. , and preferably at least three quarters, of the length of the longitudinal face. In this case, the longitudinal rows are preferably centered on the median part of the longitudinal face.

Dans le cas ici représenté, le bloc-cylindres est muni de deux fois deux rangées longitudinales, avec une première rangée 6 située sensiblement à mi-hauteur de la partie inférieure 5 du bloc-cylindres. Ceci confère une meilleure rigidité transversale aux jupes, améliorant ainsi leur comportement en flexion.In the case shown here, the cylinder block is provided with twice two longitudinal rows, with a first row 6 located substantially halfway up the lower portion 5 of the cylinder block. This imparts better transverse rigidity to the skirts, thus improving their bending behavior.

Par ailleurs, une seconde rangée 7 est de préférence disposée sensiblement au niveau de la transition entre les parties supérieure 2 et inférieure 5 du bloc-cylindres 1, c'est-à-dire au niveau de la liaison entre les fûts (cylindres 3) et la jupe du moteur.Furthermore, a second row 7 is preferably disposed substantially at the level of the transition between the upper and lower portions 5 of the cylinder block 1, that is to say at the connection between the drums (cylinders 3). and the skirt of the engine.

Cette ligne 7 longitudinale permet une meilleure solidarisation entre les parties supérieure 2 et inférieure 5 du bloc-cylindres 1 et améliore le comportement de celui-ci lorsqu'il est soumis à des efforts de torsion.This longitudinal line 7 allows better solidarity between the upper and lower portions 5 of the cylinder block 1 and improves the behavior thereof when subjected to torsional forces.

L'invention permet ainsi un renforcement structurel du bloc-cylindres 1 et une diminution des bruits rayonnés par le moteur lorsqu'il est soumis à des efforts de torsion et/ou de flexion. En particulier, lorsque le bloc-cylindres 1 est soumis à des excitations vibratoires comprises entre 800 et 3000 Hz, les bruits générés par la vibration du bloc 1 sont réduits de 2 à 3dB par rapport aux bloc-cylindres connus.The invention thus allows a structural strengthening of the cylinder block 1 and a reduction of noise radiated by the engine when it is subjected to torsional and / or bending forces. In particular, when the cylinder block 1 is subjected to vibratory excitations between 800 and 3000 Hz, the noise generated by the vibration of the block 1 are reduced by 2 to 3dB with respect to the known cylinder blocks.

L'atténuation des bruits est particulièrement importante autour des fréquences comprises entre 2500 et 2700 Hz ainsi qu'entre 1000 et 1800 Hz.Noise attenuation is particularly important around frequencies between 2500 and 2700 Hz and between 1000 and 1800 Hz.

Dans l'exemple de réalisation proposé figure 2, une troisième rangée 8 est prévue.In the proposed embodiment figure 2 a third row 8 is provided.

Les cloisons délimitant deux caissons consécutifs d'une même rangée constituent également des lignes verticales disposées de façon régulière le long des faces longitudinales du bloc-cylindres. Ces lignes sont orientées de bas en haut sur le bloc-cylindres.The partitions delimiting two consecutive boxes of the same row also constitute vertical lines arranged regularly along the longitudinal sides of the cylinder block. These lines are oriented from bottom to top on the cylinder block.

Ces cloisons verticales contribuent à rigidifier le bloc-cylindres qui est ainsi menu d'un maillage formant pratiquement une cote de lignes.These vertical partitions contribute to stiffen the cylinder block which is thus a menu of a mesh forming virtually a line dimension.

La figure 3 illustre un agencement d'une pluralité de noyaux utilisé dans un procédé de moulage qui peut être avantageusement mis en oeuvre pour la réalisation de blocs-cylindres selon l'invention. Selon l'exemple de réalisation illustré de façon très schématique sur cette figure 3, quatre agencements de blocs-cylindres sont disposés de façon alignée dans un moule.The figure 3 illustrates an arrangement of a plurality of cores used in a molding process that can be advantageously used for producing cylinder blocks according to the invention. According to the exemplary embodiment illustrated very schematically on this figure 3 four cylinder block arrangements are aligned in a mold.

Plus précisément, les agencements de noyaux sont associés par paire. Les agencements de chaque paire sont accolés face inférieure contre face inférieure - c'est-à-dire qu'il y a deux grappes de deux blocs-cylindres joints à leur base.More precisely, the arrangements of cores are associated in pairs. The arrangements of each pair are contiguous lower face against lower face - that is to say, there are two clusters of two cylinder blocks joined to their base.

Chaque noyau est muni d'une série d'excroissances.Each nucleus is provided with a series of excrescences.

Entre deux excroissances se forment ainsi des cloisons, sans communication longitudinale entre les caissons délimités par ces cloisons. Par contre, comme ces excroissances sont rattachées par des isthmes au noyau central de sorte que la chambre intérieure de chaque caisson communique avec l'espace intérieur de chaque cylindre.Between two protuberances thus form partitions, without longitudinal communication between the caissons delimited by these partitions. On the other hand, since these excrescences are attached by isthms to the central nucleus so that the inner chamber of each box communicates with the interior space of each cylinder.

Pour ce qui est du mode de réalisation prévoyant également une rangée de caissons environ à mi-hauteur du fut (cas de la figure 2), il faut prévoir également des excroissances sur le noyau utilisé pour les enveloppes d'eau, tel que représenté par exemple figure 4 où les excroissances 8' correspondent aux caissons 8 de la figure 2, et où on reconnaît notamment les éléments de noyaux 3' correspondant aux cylindres 3.With regard to the embodiment also providing a row of boxes approximately halfway up the floor (case of the figure 2 ), it is also necessary to provide protrusions on the core used for the water envelopes, as represented for example figure 4 where the excrescences 8 'correspond to the caissons 8 of the figure 2 , and in which the elements of cores 3 'corresponding to the cylinders 3 are particularly recognizable.

Claims (9)

  1. Internal combustion engine cylinder block (1) comprising an upper portion (2) comprising a plurality of cylindrical bores (3) aligned in a longitudinal direction and a water jacket (4) surrounding said bores, a lower portion (5) such as a skirt and defining a volume for a crankshaft mechanism, the cylinder block (1) comprising two longitudinal faces arranged on either side of the alignment of the cylindrical bores (3), characterised in that at least one of the two longitudinal faces of the cylinder block comprises at least a first set of casings (6, 7) forming chambers (6, 7) which do not communicate with one another and having a common outer wall extending continuously over a portion of the length of a longitudinal face, and in that the inner chamber of at least one casing (6, 7) communicates at least in places with the inner volume of the cylinder block (1).
  2. Cylinder block (1) according to claim 1, characterised in that the casings (6, 7) have a thickness between 15 and 30 mm.
  3. Cylinder block (1) according to any one of the preceding claims, characterised in that a first set of casings (6, 7) extends over at least two thirds of the length of the longitudinal face.
  4. Cylinder block (1) according to claim 3, characterised in that a first set of casings (6, 7) extends over at least three quarters the length of the longitudinal face.
  5. Cylinder block (1) according to any one of the preceding claims, characterised in that the height of a first set of casings (6, 7) is between 3 and 20 % of the height of a longitudinal face.
  6. Cylinder block (1) according to any one of the preceding claims, characterised in that a first set of casings (7) is arranged at the transition between the upper (2) and lower (5) portions of the cylinder block (1).
  7. Cylinder block (1) according to any one of the preceding claims, characterised in that a first set of casings (6) is arranged at the mid-height of the lower portion (5) of the cylinder block (1).
  8. Cylinder block (1) according to any one of the preceding claims, characterised in that a further set of casings (8) is arranged at the mid-height of the upper portion (2) of the cylinder block (1).
  9. Internal combustion engine, characterised in that it comprises a cylinder block (1) according to any one of the preceding claims.
EP05770967A 2004-04-30 2005-04-29 Noice reduction cylinder block Not-in-force EP1781434B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0450839A FR2869556B1 (en) 2004-04-30 2004-04-30 METHOD FOR MOLDING A CYLINDERS BLOCK
PCT/FR2005/001088 WO2005105338A2 (en) 2004-04-30 2005-04-29 Cylinder block, moulding method and engine comprising one such cylinder block

Publications (2)

Publication Number Publication Date
EP1781434A2 EP1781434A2 (en) 2007-05-09
EP1781434B1 true EP1781434B1 (en) 2011-10-12

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EP05770967A Not-in-force EP1781434B1 (en) 2004-04-30 2005-04-29 Noice reduction cylinder block

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EP (1) EP1781434B1 (en)
AT (1) ATE528088T1 (en)
ES (1) ES2371082T3 (en)
FR (1) FR2869556B1 (en)
WO (1) WO2005105338A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105855473A (en) * 2016-05-27 2016-08-17 江铃汽车股份有限公司 Engine cylinder block core-assembly process, engine cylinder block sand core and sand core set

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302250A (en) * 1963-12-18 1967-02-07 Gen Motors Corp Core box and molding assembly for internal combustion engine blocks
DE4324609C2 (en) * 1993-07-22 1997-10-16 Avl Verbrennungskraft Messtech Crankcase for internal combustion engines
JPH11200943A (en) * 1998-01-12 1999-07-27 Isuzu Motors Ltd Cylinder block structure
US6533020B2 (en) * 2001-06-11 2003-03-18 General Motors Corporation Casting of engine blocks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105855473A (en) * 2016-05-27 2016-08-17 江铃汽车股份有限公司 Engine cylinder block core-assembly process, engine cylinder block sand core and sand core set

Also Published As

Publication number Publication date
ATE528088T1 (en) 2011-10-15
FR2869556A1 (en) 2005-11-04
ES2371082T3 (en) 2011-12-27
FR2869556B1 (en) 2006-06-02
WO2005105338A3 (en) 2006-05-26
WO2005105338A2 (en) 2005-11-10
EP1781434A2 (en) 2007-05-09

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