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EP1910718A2 - Sealing device for internal combustion engine piston - Google Patents

Sealing device for internal combustion engine piston

Info

Publication number
EP1910718A2
EP1910718A2 EP06778949A EP06778949A EP1910718A2 EP 1910718 A2 EP1910718 A2 EP 1910718A2 EP 06778949 A EP06778949 A EP 06778949A EP 06778949 A EP06778949 A EP 06778949A EP 1910718 A2 EP1910718 A2 EP 1910718A2
Authority
EP
European Patent Office
Prior art keywords
segment
sealing device
groove
piston
holding member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06778949A
Other languages
German (de)
French (fr)
Inventor
Jean-Marc Boulard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1910718A2 publication Critical patent/EP1910718A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
    • F16J9/064—Rings with a flat annular side rail
    • F16J9/066—Spring expander from sheet metal

Definitions

  • the present invention relates to internal combustion engines and particularly relates to a piston sealing device.
  • the invention more particularly relates to a piston comprising at least one segment, said segment being disposed in an annular groove formed at the periphery of the piston, and held against the lower side of the annular groove by a holding member interposed between the upper face of said segment and the upper side of said groove.
  • the upper sealing segments have a cut necessary for the opening of the segment during the mounting operation of the latter in the upper groove.
  • a passage for the combustion gases is formed at the sectional cut. Crossing this passage, so-called “blow-by” gas flows observed at full load or so-called “blow-back” gas flow rates in the foot-lift phases represent at least 85% of the total flow.
  • the upper sealing segment becomes unstable and no longer ensures tightness. This beat phenomenon is usually observed under low load and at high speed. During these flapping phases, the gas flow suddenly increases up to six times the full load flow, which is accompanied by a decrease in power and an increase in the dilution (presence of gasoline in the oil). ). Also under low load and very high speed, the first segment can remain plated on the upper side of the first groove while the piston is in the relaxation phase. Under these conditions the pressure in the chamber does not compensate for the forces resulting from the inertia of the segment. Thus the segment remains plated on the upper flank of the throat. The segments have a very slight bulge on the rubbing surface.
  • This crown exposes the pressure of the combustion gases to a sufficient surface to generate a radial resultant force capable of causing the temporary collapse of the segment. There is then a very significant increase in the flow of combustion gas to the casing. This phenomenon is known as of "radial collapse”. The two aforementioned phenomena occur on the same range of speed and load.
  • the axial flapping movements of the upper segment reduce the seal with respect to gas flow rates from the combustion chamber to the oil sump as well as the gas flows mixed with the oil of the casing.
  • the present invention aims to limit the movements of axial flapping of a sealing segment.
  • the subject of the invention is a device for sealing a piston, comprising at least one segment mounted in a groove of the piston, characterized in that it comprises a segment holding member for pressing said segment against one of the sides of the throat.
  • the holding member is disposed between the segment and the upper side of the groove.
  • the holding member comprises a circumferential portion forming a spring and having a succession of peaks in contact with the segment or the side of the groove.
  • the holding member comprises a circumferential portion forming a spring and provided with a succession of vertices in alternating contact with the segment or the side of the groove.
  • the circumferential portion forming a spring consists of a succession of trapezoidal shapes, the vertices of which are in alternating contact with the upper flank of the groove and with the upper face of the segment.
  • the circumferential spring portion has a stiffness greater than a Kmin value so as to maintain the segment in contact with the lower flank of the groove.
  • the circumferential portion forming a spring has a stiffness less than a value Kmax so as to allow free rotation of the segment around the axis of the piston.
  • the circumferential spring portion has a section with two raised edges.
  • the segment comprises along its inner periphery a rail and the holding member is provided with means for hooking said member to the rail.
  • the holding member further comprises lugs.
  • the circumferential part is manufactured by cutting, stamping and bending from a spring steel strip.
  • the segment is a superior sealing segment.
  • the invention also relates to an internal combustion engine piston comprising at least one sealing device according to any one of the preceding claims.
  • FIG. 1 is a schematic representation of a portion of an engine including a crankshaft and a piston mounted in a cylinder head and having three grooves segments;
  • FIG. 2 is a schematic representation of the upper part of an internal combustion engine piston comprising the sealing device according to the invention.
  • FIG. 3 is a detailed schematic representation of the assembled sealing device according to the invention.
  • FIG. 4 is a schematic front view of the sealing device of Figure 3.
  • FIG. 1 represents a part of an internal combustion engine composed in particular of a crankshaft 9, a connecting rod 8 and a piston 1 placed in a jacket 7 and provided with three grooves 4a, 4b, 4c intended to house each a piston ring.
  • the crankshaft 9 When the crankshaft 9 is in rotation, it puts in translation movement via the rod 8 the piston 1 in the jacket 7.
  • FIG. 2 shows the piston 1 comprising in its groove 4a an upper sealing segment 2. Between the upper part of the groove 4a and the upper face of the segment 2 is interposed a holding member 3 intended to be plated, by its stiffness axial, the segment 2 against the lower part of the groove 4a.
  • said upper sealing segment 2 is provided along its inner periphery with a rail 5.
  • said holding member 3 comprises in particular a circumferential portion 3a, forming a spring, consisting of a succession of trapezoidal shapes, whose vertices are in alternating contact with the upper flank of the groove 4a and with the upper face of the segment 2.
  • Said holding member 3 also comprises a quantity N of hooks 3b regularly arranged on the side inside the circumferential portion 3a and intended to hook the holding member 3 to the rail 5 of the segment 2. More specifically, the hooks 3b are made of material of the tops of the circumferential portion forming a spring, in contact with the upper face of the segment (2).
  • the rail 5, produced by machining represents a prominent catch for the hooks 3b.
  • the rail 5 can be hollowed in the segment 2 thus allowing the housing of the hooks 3b.
  • the hooks 3b provide a diametral position of the holding member 3 relative to the relatively fixed segment 2. It will be noted that the hooks 3b exert radial forces which guarantee the radial extension of the segment 2.
  • the circumferential portion 3a forming a spring has a stiffness intended to suppress the axial beat movements of the segment 2.
  • the stiffness is therefore greater than a value Kmin so as to maintain the segment 2 in contact with the lower flank of the groove 4a .
  • the stiffness is less than a Kmax value so as to allow the free rotation of the segment 2 about the axis 6 of the piston 1. It is not necessary to generate too much friction between the segment 2 and the lower flank of the groove 4a because there could occur phenomena of micro welding during engine break-in and wear phenomena.
  • the terminals Kmin and Kmax delimiting the stiffness are calculated in particular according to the mass of the segment 2, the maximum engine speed and the stroke of the piston 1.
  • the circumferential portion 3a forming a spring has at its cutting two raised edges 3d which in contact allow peripheral crushing of said circumferential portion 3a during the mounting phase.
  • the holding member 3 further comprises lugs 3c which facilitate the assembly of the assembly consisting of the segment 2 and the holding member 3 in the groove 4a.
  • the rail 5 is obtained directly by machining the sealing segment 2.
  • the holding member 3 is manufactured by cutting, stamping and bending from a spring steel strip.
  • the hooking member 3 is first hooked onto the segment 2 by means of the hooks 3b, and then the assembly constituted by the segment 2 and the hold 3 in the groove 4a.
  • the holding member 3 then mounted in the groove 4a plates the segment 2 against the lower face of the groove 4a by virtue of its stiffness. Due to its shape, it adapts to several groove widths and therefore has a self-calibrating character.
  • the invention proposes an original sealing device which solves the problems of axial flapping of the piston rings by interposing an inexpensive holding member.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

The invention concerns a device for sealing a piston (1), comprising at least one segment (2) mounted in a groove (4a) of the piston, characterized in that it comprises a member (3) for maintaining the segment (2) to press the segment (2) against one of the flanks of the groove (4a).

Description

DISPOSITIF D'ETANCHEITE POUR PISTON DE MOTEUR A COMBUSTION INTERNE SEALING DEVICE FOR INTERNAL COMBUSTION ENGINE PISTON
La présente invention revendique la priorité de la demande française 0506027 déposée le 14/06/2005 dont le contenu (description, revendications, dessins) est incorporé ici par référence.The present invention claims the priority of the French application 0506027 filed on 14/06/2005 whose content (description, claims, drawings) is incorporated herein by reference.
La présente invention concerne les moteurs à combustion interne et a notamment pour objet un dispositif d'étanchéité de piston. L'invention concerne plus particulièrement un piston comportant au moins un segment, ledit segment étant disposé dans une gorge de forme annulaire ménagée en périphérie du piston, et maintenu contre le flanc inférieur de la gorge de forme annulaire par un organe de maintien interposé entre la face supérieure dudit segment et le flanc supérieur de ladite gorge.The present invention relates to internal combustion engines and particularly relates to a piston sealing device. The invention more particularly relates to a piston comprising at least one segment, said segment being disposed in an annular groove formed at the periphery of the piston, and held against the lower side of the annular groove by a holding member interposed between the upper face of said segment and the upper side of said groove.
Dans les moteurs à combustion interne, il est connu de disposer un ou plusieurs segments de piston logés dans une gorge du piston, de manière à assurer l'étanchéité entre la partie inférieure du moteur qui comprend le carter d'huile de lubrification, et la partie supérieure du moteur qui comprend la chambre de combustion. De préférence trois types de segment de piston sont nécessaires pour assurer cette étanchéité lorsque le piston est en mouvement de translation dans la chemise. Chacun des segments assure un rôle déterminé. C'est ainsi qu'il est connu de disposer, dans une gorge supérieure, un segment dit supérieur destiné à résister à la chaleur et à assurer l'étanchéité de la chambre de combustion, dans une gorge inférieure, un segment racleur destiné à empêcher les remontées d'huile du carter d'huile vers la chambre de combustion, et, dans au moins une gorge intermédiaire, un segment de compression assurant la récupération de l'huile qui remonte du carter d'huile. Toutefois l'étanchéité de la chambre de combustion n'est pas totalement assurée par les segments d'étanchéité supérieur et l'on observe un certain débit de gaz de combustion vers la partie inférieure du moteur en dépit de la présence du segment d'étanchéité supérieur. Plusieurs causes sont à l'origine de ce phénomène.In internal combustion engines, it is known to have one or more piston rings housed in a groove of the piston, so as to seal between the lower part of the engine which comprises the lubricating oil sump, and the upper part of the engine which includes the combustion chamber. Preferably three types of piston ring are required to provide this seal when the piston is in translation movement in the jacket. Each of the segments performs a specific role. Thus it is known to have, in an upper groove, a so-called upper segment intended to resist heat and to seal the combustion chamber, in a lower groove, a scraper segment intended to prevent the upwellings of the oil sump to the combustion chamber, and, in at least one intermediate groove, a compression segment ensuring the recovery of the oil which rises from the sump. However, the tightness of the combustion chamber is not completely ensured by the upper sealing segments and a certain flow of combustion gas is observed towards the lower part of the engine despite the presence of the sealing segment. superior. Several causes are at the origin of this phenomenon.
Tout d'abord, les segments d'étanchéité supérieurs présentent une coupe nécessaire à l'ouverture du segment lors de l'opération de montage de ce dernier dans la gorge supérieure. Lorsque le segment est en contact plan sur l'un des flancs de gorge, il se forme alors un passage pour les gaz de combustion au niveau de la coupe du segment. Traversant ce passage, les débits de gaz dits « de blow-by » observés en pleine charge ou les débits de gaz dits « de blow-back » dans les phases de levés de pied représentent au moins 85% du débit total.Firstly, the upper sealing segments have a cut necessary for the opening of the segment during the mounting operation of the latter in the upper groove. When the segment is in plane contact on one of the throat flanks, a passage for the combustion gases is formed at the sectional cut. Crossing this passage, so-called "blow-by" gas flows observed at full load or so-called "blow-back" gas flow rates in the foot-lift phases represent at least 85% of the total flow.
Ensuite, sous certaines conditions de charge et de régime, le segment d'étanchéité supérieur devient instable et n'assure plus l'étanchéité. Ce phénomène de battement est généralement observé sous faible charge et à haut régime. Durant ces phases de battement le débit de gaz augmente subitement jusqu'à six fois le débit de pleine charge, ceci s'accompagne d'une diminution de la puissance et d'une augmentation de la dilution (présence d'essence dans l'huile). Egalement sous faible charge et très haut régime, le premier segment peut resté plaqué sur le flanc supérieur de la première gorge pendant que le piston est en phase de détente. Dans ces conditions la pression dans la chambre ne permet pas de compenser les efforts résultants de l'inertie du segment. Ainsi le segment reste plaqué sur le flanc supérieur de la gorge. Les segments présentent un très léger bombé sur la surface frottante. Ce bombé expose à la pression des gaz de combustion une surface suffisante pour générer un effort résultant radial capable d'engendrer l'effondrement temporaire du segment. On observe alors une augmentation très importante du débit de gaz de combustion vers le carter. Ce phénomène est connu sous le nom de "radial collapse". Les deux phénomènes précités se produisent sur la même plage de régime et de charge.Then, under certain conditions of load and speed, the upper sealing segment becomes unstable and no longer ensures tightness. This beat phenomenon is usually observed under low load and at high speed. During these flapping phases, the gas flow suddenly increases up to six times the full load flow, which is accompanied by a decrease in power and an increase in the dilution (presence of gasoline in the oil). ). Also under low load and very high speed, the first segment can remain plated on the upper side of the first groove while the piston is in the relaxation phase. Under these conditions the pressure in the chamber does not compensate for the forces resulting from the inertia of the segment. Thus the segment remains plated on the upper flank of the throat. The segments have a very slight bulge on the rubbing surface. This crown exposes the pressure of the combustion gases to a sufficient surface to generate a radial resultant force capable of causing the temporary collapse of the segment. There is then a very significant increase in the flow of combustion gas to the casing. This phenomenon is known as of "radial collapse". The two aforementioned phenomena occur on the same range of speed and load.
Afin d'assurer des conditions de dépression dans le carter cylindre et dans la culasse vis à vis des étanchéités du moteur, l'ensemble des gaz de blow-by doit être évacué. Depuis longtemps les normes environnementales imposent le traitement de ces gaz. Cette opération est réalisée par un ou des déshuileurs, qui sont reliés au répartiteur d'admission. Plus les débits de gaz sont importants et plus les systèmes sont complexes. Dans certain cas, l'architecture des moteurs, en présence de débits élevés ne permet pas la redescente de l'huile vers le carter d'huile. La culasse s'engorge alors et il arrive que le moteur réaspire de l'huile. Ceci peut conduire à la destruction du moteur.In order to ensure vacuum conditions in the crankcase and in the cylinder head with respect to the sealing of the engine, all the blow-by gases must be evacuated. For a long time, environmental standards have imposed the treatment of these gases. This operation is performed by one or more de-oilers, which are connected to the intake distributor. The higher the gas flows, the more complex the systems. In some cases, the architecture of the engines, in the presence of high flows does not allow the return of the oil to the sump. The cylinder head then engulfs and it happens that the engine re-aspires oil. This can lead to the destruction of the engine.
En résumé, les mouvements de battement axial du segment supérieur diminuent l'étanchéité vis à vis des débits de gaz de la chambre de combustion vers le carter d'huile ainsi que des remontées de gaz mélangés à l'huile du carter.In summary, the axial flapping movements of the upper segment reduce the seal with respect to gas flow rates from the combustion chamber to the oil sump as well as the gas flows mixed with the oil of the casing.
C'est pourquoi, la présente invention a pour but de limiter les mouvements de battement axial d'un segment d'étanchéité.Therefore, the present invention aims to limit the movements of axial flapping of a sealing segment.
A cet effet, l'invention a pour objet un dispositif d'étanchéité d'un piston, comprenant au moins un segment monté dans une gorge du piston, caractérisé en ce qu'il comprend un organe de maintien du segment pour plaquer ledit segment contre un des flancs de la gorge.For this purpose, the subject of the invention is a device for sealing a piston, comprising at least one segment mounted in a groove of the piston, characterized in that it comprises a segment holding member for pressing said segment against one of the sides of the throat.
Selon d'autres caractéristiques :According to other characteristics:
L'organe de maintien est disposé entre le segment et le flanc supérieur de la gorge.The holding member is disposed between the segment and the upper side of the groove.
L'organe de maintien comprend une partie circonférentielle formant ressort et dotée d'une succession de sommets en contact avec le segment ou le flanc de la gorge. L'organe de maintien comprend une partie circonférentielle formant ressort et dotée d'une succession de sommets en contact alternativement avec le segment ou le flanc de la gorge.The holding member comprises a circumferential portion forming a spring and having a succession of peaks in contact with the segment or the side of the groove. The holding member comprises a circumferential portion forming a spring and provided with a succession of vertices in alternating contact with the segment or the side of the groove.
La partie circonférentielle formant ressort est constituée d'une succession de formes trapézoïdales, dont les sommets sont en contact alternativement avec le flanc supérieur de la gorge et avec la face supérieure du segment.The circumferential portion forming a spring consists of a succession of trapezoidal shapes, the vertices of which are in alternating contact with the upper flank of the groove and with the upper face of the segment.
La partie circonférentielle formant ressort présente une raideur supérieure à une valeur Kmin de manière à maintenir le segment en contact avec le flanc inférieur de la gorge.The circumferential spring portion has a stiffness greater than a Kmin value so as to maintain the segment in contact with the lower flank of the groove.
La partie circonférentielle formant ressort présente une raideur inférieure à une valeur Kmax de manière à permettre la libre rotation du segment autour de l'axe du piston.The circumferential portion forming a spring has a stiffness less than a value Kmax so as to allow free rotation of the segment around the axis of the piston.
La partie circonférentielle formant ressort présente une coupe avec deux bords relevés.The circumferential spring portion has a section with two raised edges.
Le segment comporte le long de sa périphérie intérieure un rail et l'organe de maintien est doté de moyens pour accrocher ledit organe au rail.The segment comprises along its inner periphery a rail and the holding member is provided with means for hooking said member to the rail.
L'organe de maintien comporte en outre des ergots.The holding member further comprises lugs.
La partie circonférentielle est fabriquée par découpe, emboutissage et pliage à partir d'un feuillard en acier à ressort.The circumferential part is manufactured by cutting, stamping and bending from a spring steel strip.
Le segment est un segment d'étanchéité supérieur.The segment is a superior sealing segment.
L'invention concerne également un piston de moteur à combustion interne comportant au moins un dispositif d'étanchéité conforme à l'une quelconque des revendications précédentes.The invention also relates to an internal combustion engine piston comprising at least one sealing device according to any one of the preceding claims.
L'invention va maintenant être décrite plus en détail mais de façon non limitative en regard des figures annexées, dans lesquelles :The invention will now be described in more detail but in a nonlimiting manner with reference to the appended figures, in which:
- La figure 1 est une représentation schématique d'une partie d'un moteur composée notamment d'un vilebrequin et d'un piston monté dans une culasse et comportant trois gorges de segments - La figure 2 est une représentation schématique de la partie supérieure d'un piston de moteur à combustion interne comportant le dispositif d'étanchéité conforme à l'invention.- Figure 1 is a schematic representation of a portion of an engine including a crankshaft and a piston mounted in a cylinder head and having three grooves segments; - Figure 2 is a schematic representation of the upper part of an internal combustion engine piston comprising the sealing device according to the invention.
- La figure 3 est une représentation schématique détaillée du dispositif d'étanchéité assemblé conformément à l'invention.- Figure 3 is a detailed schematic representation of the assembled sealing device according to the invention.
- la figure 4 est une représentation schématique de face du dispositif d'étanchéité de la figure 3.- Figure 4 is a schematic front view of the sealing device of Figure 3.
La figure 1 représente une partie d'un moteur à combustion interne composée notamment d'un vilebrequin 9, d'une bielle 8 et d'un piston 1 placé dans une chemise 7et pourvu de trois gorges 4a, 4b, 4c destinées à loger chacune un segment de piston. Lorsque le vilebrequin 9 est en rotation, il met en mouvement de translation via la bielle 8 le piston 1 dans la chemise 7.FIG. 1 represents a part of an internal combustion engine composed in particular of a crankshaft 9, a connecting rod 8 and a piston 1 placed in a jacket 7 and provided with three grooves 4a, 4b, 4c intended to house each a piston ring. When the crankshaft 9 is in rotation, it puts in translation movement via the rod 8 the piston 1 in the jacket 7.
La figure 2 représente le piston 1 comportant dans sa gorge 4a un segment d'étanchéité supérieur 2. Entre la partie supérieure de la gorge 4a et la face supérieure du segment 2 est interposé un organe de maintien 3 destiné à plaquer, de par sa raideur axiale, le segment 2 contre la partie inférieure de la gorge 4a.FIG. 2 shows the piston 1 comprising in its groove 4a an upper sealing segment 2. Between the upper part of the groove 4a and the upper face of the segment 2 is interposed a holding member 3 intended to be plated, by its stiffness axial, the segment 2 against the lower part of the groove 4a.
Plus précisément et tel que décrit en figure 3, ledit segment d'étanchéité supérieur 2 est doté le long de sa périphérie intérieure d'un rail 5. De plus, ledit organe de maintien 3 comporte notamment une partie circonférentielle 3a, formant un ressort, constituée d'une succession de formes trapézoïdales, dont les sommets sont en contact alternativement avec le flanc supérieur de la gorge 4a et avec la face supérieure du segment 2. Ledit organe de maintien 3 comporte également une quantité N de crochets 3b disposés régulièrement du côté intérieur de la partie circonférentielle 3a et destinés à accrocher l'organe de maintien 3 au rail 5 du segment 2. Plus précisément, les crochets 3b sont venus de matière des sommets de la partie circonférentielle formant ressort, en contact avec la face supérieure du segment (2). Selon le mode de réalisation représenté sur la figure 3, le rail 5, réalisé par usinage, représente une accroche proéminente pour les crochets 3b. Selon un autre mode de réalisation non représenté sur les figures, le rail 5 peut être creusé dans le segment 2 permettant ainsi le logement des crochets 3b. En résumé, les crochets 3b assurent une position diamétrale de l'organe de maintien 3 par rapport au segment 2 relativement fixe. On notera que les crochets 3b exercent des efforts radiaux qui garantissent l'extension radiale du segment 2.More precisely and as described in FIG. 3, said upper sealing segment 2 is provided along its inner periphery with a rail 5. In addition, said holding member 3 comprises in particular a circumferential portion 3a, forming a spring, consisting of a succession of trapezoidal shapes, whose vertices are in alternating contact with the upper flank of the groove 4a and with the upper face of the segment 2. Said holding member 3 also comprises a quantity N of hooks 3b regularly arranged on the side inside the circumferential portion 3a and intended to hook the holding member 3 to the rail 5 of the segment 2. More specifically, the hooks 3b are made of material of the tops of the circumferential portion forming a spring, in contact with the upper face of the segment (2). According to the embodiment shown in FIG. 3, the rail 5, produced by machining, represents a prominent catch for the hooks 3b. According to another embodiment not shown in the figures, the rail 5 can be hollowed in the segment 2 thus allowing the housing of the hooks 3b. In summary, the hooks 3b provide a diametral position of the holding member 3 relative to the relatively fixed segment 2. It will be noted that the hooks 3b exert radial forces which guarantee the radial extension of the segment 2.
De plus, la partie circonférentielle 3a formant ressort présente une raideur destinée à supprimer les mouvements de battement axial du segment 2. La raideur est donc supérieure à une valeur Kmin de manière à maintenir le segment 2 en contact avec le flanc inférieur de la gorge 4a. De même, la raideur est inférieure à une valeur Kmax de manière à permettre la libre rotation du segment 2 autour de l'axe 6 du piston 1 . Il ne faut pas en effet générer trop de frottement entre le segment 2 et le flanc inférieur de la gorge 4a car il pourrait se produire des phénomènes de micro soudage lors du rodage du moteur ainsi que des phénomènes d'usure.In addition, the circumferential portion 3a forming a spring has a stiffness intended to suppress the axial beat movements of the segment 2. The stiffness is therefore greater than a value Kmin so as to maintain the segment 2 in contact with the lower flank of the groove 4a . Similarly, the stiffness is less than a Kmax value so as to allow the free rotation of the segment 2 about the axis 6 of the piston 1. It is not necessary to generate too much friction between the segment 2 and the lower flank of the groove 4a because there could occur phenomena of micro welding during engine break-in and wear phenomena.
Les bornes Kmin et Kmax délimitant la raideur sont calculées notamment en fonction de la masse du segment 2, du régime du moteur maximum et de la course du piston 1 .The terminals Kmin and Kmax delimiting the stiffness are calculated in particular according to the mass of the segment 2, the maximum engine speed and the stroke of the piston 1.
Avantageusement, la partie circonférentielle 3a formant ressort présente à sa coupe deux bords relevés 3d qui en contact permettent l'écrasement périphérique de ladite partie circonférentielle 3a durant la phase de montage.Advantageously, the circumferential portion 3a forming a spring has at its cutting two raised edges 3d which in contact allow peripheral crushing of said circumferential portion 3a during the mounting phase.
Avantageusement, l'organe de maintien 3 comporte en outre des ergots 3c qui facilitent le montage de l'ensemble constitué par le segment 2 et l'organe de maintien 3 dans la gorge 4a.Advantageously, the holding member 3 further comprises lugs 3c which facilitate the assembly of the assembly consisting of the segment 2 and the holding member 3 in the groove 4a.
Concernant la fabrication, le rail 5 est obtenu directement par usinage du segment d'étanchéité 2. L'organe de maintien 3 est fabriqué par découpe, emboutissage et pliage à partir d'un feuillard en acier à ressort.Regarding the manufacture, the rail 5 is obtained directly by machining the sealing segment 2. The holding member 3 is manufactured by cutting, stamping and bending from a spring steel strip.
Concernant le montage, on procède tout d'abord à l'accrochage de l'organe de maintien 3 sur le segment 2 au moyen des crochets 3b, puis on monte de manière classique l'ensemble constitué par le segment 2 et l'organe de maintien 3 dans la gorge 4a.With regard to the assembly, the hooking member 3 is first hooked onto the segment 2 by means of the hooks 3b, and then the assembly constituted by the segment 2 and the hold 3 in the groove 4a.
L'organe de maintien 3 alors monté dans la gorge 4a plaque le segment 2 contre la face inférieure de la gorge 4a grâce à sa raideur. De part sa forme, il s'adapte à plusieurs largeurs de gorge et présente donc un caractère auto-tarable.The holding member 3 then mounted in the groove 4a plates the segment 2 against the lower face of the groove 4a by virtue of its stiffness. Due to its shape, it adapts to several groove widths and therefore has a self-calibrating character.
Ainsi l'invention propose un dispositif d'étanchéité original qui résout le problèmes de battement axial des segments de piston en interposant un organe de maintien peu coûteux. Thus, the invention proposes an original sealing device which solves the problems of axial flapping of the piston rings by interposing an inexpensive holding member.

Claims

REVENDICATIONS
1 . Dispositif d'étanchéité d'un piston (1 ), comprenant au moins un segment d'étanchéité supérieur (2) monté dans une gorge (4a) du piston (1 ), caractérisé en ce qu'il comprend un organe de maintien (3) du segment (2) pour plaquer le segment (2) contre le flanc inférieur de la gorge (4a).1. Sealing device for a piston (1), comprising at least one upper sealing segment (2) mounted in a groove (4a) of the piston (1), characterized in that it comprises a holding member (3) ) of the segment (2) to press the segment (2) against the lower side of the groove (4a).
2. Dispositif d'étanchéité selon la revendication 1 , caractérisé en ce que ledit organe de maintien (3) comprend une partie circonférentielle (3a) formant ressort et dotée d'une succession de sommets en contact avec le segment (2) ou le flanc de la gorge (4a).2. Sealing device according to claim 1, characterized in that said holding member (3) comprises a circumferential portion (3a) forming a spring and provided with a succession of vertices in contact with the segment (2) or the sidewall. of the throat (4a).
3. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit organe de maintien (3) comprend une partie circonférentielle (3a) formant ressort et dotée d'une succession de sommets en contact alternativement avec le segment (2) ou le flanc de la gorge (4a).3. Sealing device according to any one of the preceding claims, characterized in that said holding member (3) comprises a circumferential portion (3a) forming a spring and provided with a succession of vertices in alternating contact with the segment ( 2) or the side of the groove (4a).
4. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie circonférentielle (3a) formant ressort est constituée d'une succession de formes trapézoïdales, dont les sommets sont en contact alternativement avec le flanc supérieur de la gorge (4a) et avec la face supérieure du segment (2),4. Sealing device according to any one of the preceding claims, characterized in that the circumferential portion (3a) forming a spring consists of a succession of trapezoidal shapes, whose vertices are in contact alternately with the upper flank of the groove (4a) and with the upper face of the segment (2),
5. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie circonférentielle (3a) formant ressort à une raideur telle qu'elle permet la libre rotation du segment (2) autour de l'axe (6) du piston (1 ). 5. Sealing device according to any one of the preceding claims, characterized in that the circumferential portion (3a) forming a spring to a stiffness such that it allows the free rotation of the segment (2) about the axis (6). ) of the piston (1).
6. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie circonférentielle (3a) formant ressort présente une coupe avec deux bords relevés (3d).6. Sealing device according to any one of the preceding claims, characterized in that the circumferential portion (3a) forming a spring has a section with two raised edges (3d).
7. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que :Sealing device according to one of the preceding claims, characterized in that:
- le segment (2) comporte le long de sa périphérie intérieure un rail (5),the segment (2) comprises along its inner periphery a rail (5),
- l'organe de maintien (3) est doté de moyens (3b) pour l'accrocher au rail (5).- The holding member (3) is provided with means (3b) for hanging on the rail (5).
8. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que l'organe de maintien (3) comporte en outre des ergots (3c).8. Sealing device according to any one of the preceding claims, characterized in that the holding member (3) further comprises lugs (3c).
9. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie circonférentielle (3a) est fabriquée par découpe, emboutissage et pliage à partir d'un feuillard en acier à ressort.9. Sealing device according to any one of the preceding claims, characterized in that the circumferential portion (3a) is manufactured by cutting, stamping and bending from a spring steel strip.
10. Dispositif d'étanchéité selon l'une quelconque des revendications précédentes, caractérisé en ce que le segment (2) est un segment d'étanchéité supérieur.10. Sealing device according to any one of the preceding claims, characterized in that the segment (2) is an upper sealing segment.
1 1 . Piston de moteur à combustion interne comportant au moins un dispositif d'étanchéité conforme à l'une quelconque des revendications précédentes. 1 1. An internal combustion engine piston comprising at least one sealing device according to any one of the preceding claims.
EP06778949A 2005-06-14 2006-06-13 Sealing device for internal combustion engine piston Withdrawn EP1910718A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0506027A FR2887004B1 (en) 2005-06-14 2005-06-14 SEALING DEVICE FOR INTERNAL COMBUSTION ENGINE PISTON
PCT/FR2006/050602 WO2006134309A2 (en) 2005-06-14 2006-06-13 Sealing device for internal combustion engine piston

Publications (1)

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EP1910718A2 true EP1910718A2 (en) 2008-04-16

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EP06778949A Withdrawn EP1910718A2 (en) 2005-06-14 2006-06-13 Sealing device for internal combustion engine piston

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EP (1) EP1910718A2 (en)
CN (1) CN101310133B (en)
BR (1) BRPI0612970A2 (en)
FR (1) FR2887004B1 (en)
WO (1) WO2006134309A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2917787A1 (en) * 2007-06-25 2008-12-26 Peugeot Citroen Automobiles Sa Cylinder case's piston sealing and pressure regulating device for petrol engine of motor vehicle, has pressure regulation valve partially regulating discharge flow of exhaust gas of cylinder case of block of engine of vehicle
DE102015116838B3 (en) * 2015-10-05 2017-02-02 Federal-Mogul Burscheid Gmbh piston ring

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2557721B1 (en) * 1975-12-20 1977-01-13 Goetzewerke AXIAL AND RADIALLY TENSIONING SPREADER RING FOR OIL WIPER PISTON RINGS
DE3540618A1 (en) * 1984-11-28 1986-05-28 Toyota Jidosha K.K., Toyota, Aichi THREE-PIECE OIL SCRAPER WITH A SLIT
CA2023718C (en) * 1989-08-31 1998-07-14 Sumio Ono Steel oil ring assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006134309A3 *

Also Published As

Publication number Publication date
FR2887004B1 (en) 2007-11-23
CN101310133B (en) 2010-12-01
WO2006134309A2 (en) 2006-12-21
FR2887004A1 (en) 2006-12-15
WO2006134309A3 (en) 2007-05-03
CN101310133A (en) 2008-11-19
BRPI0612970A2 (en) 2012-10-09

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