EP0380415A1 - Composite piston, especially for an internal-combustion engine - Google Patents

Composite piston, especially for an internal-combustion engine Download PDF

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Publication number
EP0380415A1
EP0380415A1 EP90400207A EP90400207A EP0380415A1 EP 0380415 A1 EP0380415 A1 EP 0380415A1 EP 90400207 A EP90400207 A EP 90400207A EP 90400207 A EP90400207 A EP 90400207A EP 0380415 A1 EP0380415 A1 EP 0380415A1
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EP
European Patent Office
Prior art keywords
piston according
skirt
resin
coating
piston
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Withdrawn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
EP90400207A
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German (de)
French (fr)
Inventor
Jacques Claude Dubray
Patrick Maurice Pogu
Alain Serge Dagommer
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Perfect Circle Europe SA
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Floquet Monopole SRL
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Filing date
Publication date
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Publication of EP0380415A1 publication Critical patent/EP0380415A1/en
Withdrawn legal-status Critical Current

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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
    • F02F3/00—Pistons 
    • F02F3/10—Pistons  having surface coverings
    • 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
    • F02F7/0085—Materials for constructing engines or their parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres

Definitions

  • the present invention relates to a composite piston, in particular for internal combustion engines, the skirt of which carries a coating with high mechanical resistance, with low coefficient of friction, consisting of a synthetic resin reinforced with fibers with high elasticity modulus.
  • the object of the invention is essentially to reduce friction between the skirt of the piston and the cylinder.
  • skirt the role of the skirt is to ensure the guiding in the cylinder of the part which seals, namely of the part called "segment holder".
  • the skirt therefore has a relatively large surface area, and is the source of friction, noise, and therefore loss of energy.
  • the clearance between it and the piston must be fairly large on the order of several tens of microns, which leads to an increase in oil consumption.
  • a piston according to the present invention is essentially characterized in that the resin is of the family of sulfonic polymers, the fibers with high elastic modulus preferably being carbon, glass or other fibers.
  • the sulfonic polymers are very particularly suitable for the intended application. More particularly, they include, as materials capable of being used in the coating in question, polysulfone (PS), polyethersulfone (PES) and polyphenylsulfone (PPS). Their main features are: SULPHONIC POLYMERS PROPERTIES POLYSULFONE POLYETHERSULFONE POLYPHENYLSULFONE Density g / cm3 1.24 1.37 1.29 Traction module (MPa) 2,480 2,400 2,300 Flexural modulus (MPa) 2,700 2,600 2,400 Flexural stress (MPa) 106 129 85 Continuous resistance temperature (° C) 150 175 190
  • the resin will include a filler of graphite, a material well known for its qualities of lubricant.
  • the resin may also contain polytetrafluoroethylene (PTFE) or, preferably, a fluoropolymer of the ethylene-polytetrafluoroethylene (ETFE) copolymer type.
  • ETFE ethylene-PTFE copolymer
  • the comparison table between PTFE and ETFE is as follows: PROPERTIES PTFE ETFE - Density 2.14 to 2.18 1.7 - Breaking stress (MPa) 20 to 40 45 - Flexural strength (MPa) 18 to 20 24 - Traction module (MPa) 350 to 750 825 - Shore D hardness 55 to 59 75 - Continuous resistance temperature (° C) 200 to 250 160
  • a piston according to the invention may also be characterized in that said resin comprises a filler with high mechanical properties such as hollow glass microbeads; it may contain approximately 10 to 15% by weight of hollow glass microbeads.
  • the hollow glass microbeads are made up of tiny transparent bubbles with an extremely thin glass wall (1 to 3 ⁇ ) of the borosilicate type, filled with an odorless and non-toxic gas.
  • Physical characteristics Bulk density (g / cm3) 0.16 - 0.20 Granulometry ( ⁇ ) 5 - 200 Average diameter ( ⁇ ) 80 Softening temperature (° C) 750 Crush resistance (bar) 140 Thermal conductivity (W / m ° / c) 0.055
  • hollow glass microbeads in coatings of the type concerned gives them excellent physical properties, namely a significant reduction in their density, an improvement in their thermal conductivity, their impact resistance (micro-energy absorbers ), a reduction in shrinkage and cracking during hardening (equal distribution of temperatures and residual stresses) and a very significant reduction in the volume price of the coatings produced.
  • the coating comprises approximately 60 to 80% by weight of sulphonic polymer, approximately 10% by weight of carbon fibers, approximately 10% by weight of graphite, and approximately 10% by weight. from ETFE.
  • the reference 1 designates the bottom of the piston, 2 the segment holder, and 3 the skirt.
  • the reference 4 designates the bearings of the axis of articulation at the foot of the connecting rod.
  • FIGS. 1 to 5 a coating is shown consisting of a single element in the form of a cylindrical ring 5 fixed on said skirt 3.
  • This coating has one of the compositions indicated above.
  • said covering consists of two elements in the form of cylinder portions 6, diametrically opposite on said skirt 3, being centered on the axis XX perpendicular to the axis of articulation YY of the foot of connecting rod.
  • the means for fixing said elements 6 to the skirt 3 include bonding and mechanical fixing by pins, dovetail or riveting, means used alone or in their different combinations.
  • a polyamide imide adhesive based on N-methyl 2-pyrrolidone will be particularly suitable.
  • the final profile of the coating 5 or 6 will generally be given to it by machining, at the same time as that of the metal parts of the piston, after mounting on the skirt 3.
  • the profile of the coating can, thanks to its considerably improved sliding qualities, be greatly simplified, compared to the current complicated profiles of conventional metal skirts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Composite piston, especially for an internal combustion engine, the skirt (3) of which carries a lining (5, 6) with high mechanical resistance and low coefficient of friction, composed of a synthetic resin reinforced with high-elasticity fibres, characterised in that the resin belongs to the group of sulphonic polymers. <IMAGE>

Description

La présente invention concerne un piston composite, notamment pour moteurs à combustion interne, dont la jupe porte un revêtement à résistance mécanique élevée, à faible coefficient de frottement, constitué d'une résine synthétique armée de fibres à haut module d'élasticité.The present invention relates to a composite piston, in particular for internal combustion engines, the skirt of which carries a coating with high mechanical resistance, with low coefficient of friction, consisting of a synthetic resin reinforced with fibers with high elasticity modulus.

Le but de l'invention est essentiellement de réduire les frottements entre la jupe du piston et le cylindre.The object of the invention is essentially to reduce friction between the skirt of the piston and the cylinder.

On sait que le rôle de la jupe est d'assurer le guidage dans le cylindre de la partie qui assure l'étanchéité, à savoir de la partie dite "porte-­segments". La jupe a donc une surface relativement importante, et est la source de frottements, de bruit, et donc de perte d'énergie. Pour éviter le risque de grippage du fait de la jupe, le jeu entre elle et le piston doit être assez important de l'ordre de plusieurs dizaines de microns, ce qui entraîne une augmentation de la consommation d'huile.We know that the role of the skirt is to ensure the guiding in the cylinder of the part which seals, namely of the part called "segment holder". The skirt therefore has a relatively large surface area, and is the source of friction, noise, and therefore loss of energy. To avoid the risk of seizure due to the skirt, the clearance between it and the piston must be fairly large on the order of several tens of microns, which leads to an increase in oil consumption.

On comprend donc que le but de la présente invention, en réduisant les frottements, est d'éliminer ces inconvénients de la technique antérieure, et ceci quel que soit le métal constituant le corps du piston : acier ou alliage léger.It is therefore understood that the object of the present invention, by reducing friction, is to eliminate these drawbacks of the prior art, and this whatever the metal constituting the body of the piston: steel or light alloy.

Pour ce faire, un piston conforme à la présente invention est essentiellement caractérisé en ce que la résine est de la famille des polymères sulfoniques, les fibres à haut module d'élasticité étant de préférence des fibres de carbone, verre ou autre.To do this, a piston according to the present invention is essentially characterized in that the resin is of the family of sulfonic polymers, the fibers with high elastic modulus preferably being carbon, glass or other fibers.

Les polymères sulfoniques sont tout spécialement appropriés à l'application envisagée. Ils comprennent plus particulièrement, comme matériaux susceptibles d'être utilisés dans le revêtement en question, le polysulfone (PS), le polyéthersulfone (PES) et le polyphénylsulfone (PPS). Leurs principales caractéristiques sont les suivantes : POLYMERES SULFONIQUES PROPRIETES POLYSULFONE POLYETHERSULFONE POLYPHENYLSULFONE Masse volumique g/cm³ 1,24 1,37 1,29 Module de traction (MPa) 2 480 2 400 2 300 Module de flexion (MPa) 2 700 2 600 2 400 Contrainte en flexion (MPa) 106 129 85 Température de résistance en continu (°C) 150 175 190 The sulfonic polymers are very particularly suitable for the intended application. More particularly, they include, as materials capable of being used in the coating in question, polysulfone (PS), polyethersulfone (PES) and polyphenylsulfone (PPS). Their main features are: SULPHONIC POLYMERS PROPERTIES POLYSULFONE POLYETHERSULFONE POLYPHENYLSULFONE Density g / cm³ 1.24 1.37 1.29 Traction module (MPa) 2,480 2,400 2,300 Flexural modulus (MPa) 2,700 2,600 2,400 Flexural stress (MPa) 106 129 85 Continuous resistance temperature (° C) 150 175 190

De préférence, la résine comportera une charge de graphite, matériau bien connu pour ses qualités de lubrifiant. La résine pourra également contenir du polytétrafluoréthylène (PTFE) ou, préférentiellement, un polymère fluoré du type copolymère éthylène-­polytétrafluoréthylène (ETFE).Preferably, the resin will include a filler of graphite, a material well known for its qualities of lubricant. The resin may also contain polytetrafluoroethylene (PTFE) or, preferably, a fluoropolymer of the ethylene-polytetrafluoroethylene (ETFE) copolymer type.

Le copolymère éthylène-PTFE, appelé ETFE, est très facile à mettre en oeuvre et sera en général préférable au PTFE, auquel il est supérieur pour l'ensemble de ses propriétés, exception faite de sa résistance à la température.The ethylene-PTFE copolymer, called ETFE, is very easy to use and will generally be preferable to PTFE, which it is superior for all of its properties, except for its resistance to temperature.

Le tableau de comparaison entre le PTFE et l'ETFE est le suivant : PROPRIETES PTFE ETFE - Densité 2,14 à 2,18 1,7 - Contrainte de rupture (MPa) 20 à 40 45 - Résistance à la flexion(MPa) 18 à 20 24 - Module de traction (MPa) 350 à 750 825 - Dureté shore D 55 à 59 75 - Température de résistance en continu (°C) 200 à 250 160 The comparison table between PTFE and ETFE is as follows: PROPERTIES PTFE ETFE - Density 2.14 to 2.18 1.7 - Breaking stress (MPa) 20 to 40 45 - Flexural strength (MPa) 18 to 20 24 - Traction module (MPa) 350 to 750 825 - Shore D hardness 55 to 59 75 - Continuous resistance temperature (° C) 200 to 250 160

Un piston conforme à l'invention pourra encore être caractérisé en ce que ladite résine comporte une charge à hautes propriétés mécaniques telle que des microbilles creuses de verre ; il pourra contenir environ 10 à 15 % en poids de microbilles creuses de verre.A piston according to the invention may also be characterized in that said resin comprises a filler with high mechanical properties such as hollow glass microbeads; it may contain approximately 10 to 15% by weight of hollow glass microbeads.

Les microbilles creuses de verre sont constituées de minuscules bulles transparentes à paroi de verre extrêmement fine (1 à 3µ ) du type borosilicate, emplies d'un gaz inodore et non toxique. Caractéristiques physiques : Densité apparente (g/cm³) 0,16 - 0,20 Granulométrie (µ) 5 - 200 Diamètre moyen (µ) 80 Température de ramollissement (°C) 750 Résistance à l'écrasement (bar) 140 Conductivité thermique (W/m°/c) 0,055 The hollow glass microbeads are made up of tiny transparent bubbles with an extremely thin glass wall (1 to 3 µ) of the borosilicate type, filled with an odorless and non-toxic gas. Physical characteristics : Bulk density (g / cm³) 0.16 - 0.20 Granulometry (µ) 5 - 200 Average diameter (µ) 80 Softening temperature (° C) 750 Crush resistance (bar) 140 Thermal conductivity (W / m ° / c) 0.055

L'utilisation des microbilles creuses de verre dans les revêtements du type concerné leur confère d'excellentes propriétés physiques, à savoir une réduction sensible de leur densité, une amélioration de leur conductibilité thermique, de leur résistance aux chocs (micro-absorbeurs d'énergie), une réduction du retrait et de la fissuration lors du durcissement (équirépartition des températures et des contraintes résiduelles) et une diminution très sensible du prix volumique des revêtements fabriqués.The use of hollow glass microbeads in coatings of the type concerned gives them excellent physical properties, namely a significant reduction in their density, an improvement in their thermal conductivity, their impact resistance (micro-energy absorbers ), a reduction in shrinkage and cracking during hardening (equal distribution of temperatures and residual stresses) and a very significant reduction in the volume price of the coatings produced.

Parmi les compositions particulièrement intéres­santes, on pourra retenir celle dans laquelle le revête­ment comprend environ 60 à 80 % en poids de polymère sulfonique, environ 10 % en poids de fibres de carbone, environ 10 % en poids de graphite, et environ 10 % en poids de ETFE.Among the particularly advantageous compositions, it is possible to retain that in which the coating comprises approximately 60 to 80% by weight of sulphonic polymer, approximately 10% by weight of carbon fibers, approximately 10% by weight of graphite, and approximately 10% by weight. from ETFE.

Avec les différents matériaux qui viennent d'être définis, on a constaté un gain de l'ordre de 45 % sur les pertes par frottements, d'où un gain conséquent en énergie, et une diminution des bruits et des risques de grippage. Le jeu entre la jupe du piston et le cylindre peut être réduit à quelques microns au lieu de plusieurs dizaines, d'où, en outre, une diminution notable de la consommation d'huile.With the various materials which have just been defined, there has been a gain of the order of 45% on friction losses, hence a significant gain in energy, and a reduction in noise and the risk of seizing up. The clearance between the piston skirt and the cylinder can be reduced to a few microns instead of several tens, hence, moreover, a significant reduction in oil consumption.

Deux modes d'exécution de l'invention vont main­tenant être décrits, à titre d'exemples nullement limitatifs, avec référence aux figures du dessin annexé dans lequel :

  • - la figure 1 représente un piston conforme à l'invention, en coupe axiale selon le plan qui contient l'axe de l'articulation au pied de bielle, à savoir selon la ligne I-I de la figure 2 ;
  • - la figure 2 est une vue en élévation du piston;
  • - la figure 3 est une vue en coupe horizontale selon la ligne III-III de la figure 1 ;
  • - la figure 4 est une vue en coupe axiale selon la ligne IV-IV de la figure 1 ;
  • - la figure 5 est un détail de la figure 4 ;
  • - les figures 6 et 7 sont les deux vues en élé­vation d'une variante de piston conforme à l'invention ;
  • - la figure 8 est une vue en coupe horizontale selon la ligne VIII-VIII de la figure 6 ; et
  • - la figure 9 est une vue en coupe axiale selon la ligne IX-IX de la figure 6.
Two embodiments of the invention will now be described, by way of non-limiting examples, with reference to the figures of the appended drawing in which:
  • - Figure 1 shows a piston according to the invention, in axial section along the plane which contains the axis of the articulation at the foot of the connecting rod, namely along line II of Figure 2;
  • - Figure 2 is an elevational view of the piston;
  • - Figure 3 is a horizontal sectional view along line III-III of Figure 1;
  • - Figure 4 is an axial sectional view along the line IV-IV of Figure 1;
  • - Figure 5 is a detail of Figure 4;
  • - Figures 6 and 7 are the two elevational views of a variant piston according to the invention;
  • - Figure 8 is a horizontal sectional view along the line VIII-VIII of Figure 6; and
  • FIG. 9 is a view in axial section along the line IX-IX in FIG. 6.

Sur l'ensemble des figures, la référence 1 désigne le fond du piston, 2 le porte-segments, et 3 la jupe. La référence 4 désigne les paliers de l'axe d'articulation au pied de bielle.In all of the figures, the reference 1 designates the bottom of the piston, 2 the segment holder, and 3 the skirt. The reference 4 designates the bearings of the axis of articulation at the foot of the connecting rod.

Sur les figures 1 à 5, on a représenté un revêtement constitué d'un seul élément en forme de bague cylindrique 5 fixée sur ladite jupe 3.In FIGS. 1 to 5, a coating is shown consisting of a single element in the form of a cylindrical ring 5 fixed on said skirt 3.

Ce revêtement possède l'une des compositions indiquées plus haut.This coating has one of the compositions indicated above.

Il est fixé sur la jupe 3 par tous moyens appro­priés, pouvant comprendre le vissage (figure 5), le frettage et le collage, moyens utilisés seuls ou dans leurs différentes combinaisons.It is fixed to the skirt 3 by any appropriate means, which may include screwing (Figure 5), shrinking and bonding, means used alone or in their different combinations.

Dans la variante des figures 6 à 9, ledit revêtement est constitué de deux éléments en forme de portions de cylindre 6, diamétralement opposés sur ladite jupe 3, étant centrés sur l'axe X-X perpendiculaire à l'axe d'articulation Y-Y du pied de bielle.In the variant of FIGS. 6 to 9, said covering consists of two elements in the form of cylinder portions 6, diametrically opposite on said skirt 3, being centered on the axis XX perpendicular to the axis of articulation YY of the foot of connecting rod.

Les moyens de fixation desdits éléments 6 sur la jupe 3 comprennent le collage et la fixation méca­nique par picots, queue-d'aronde ou rivetage, moyens utilisés seuls ou dans leurs différentes combinaisons.The means for fixing said elements 6 to the skirt 3 include bonding and mechanical fixing by pins, dovetail or riveting, means used alone or in their different combinations.

Lorsque l'on utilise de la colle, il est avan­tageux d'utiliser une colle du type adhésif polyamide, époxyde ou analogue.When using glue, it is advantageous to use an adhesive of the polyamide, epoxy or similar adhesive type.

Sera particulièrement approprié un adhésif polyamide imide à base de N-méthyl 2-pyrrolidone.A polyamide imide adhesive based on N-methyl 2-pyrrolidone will be particularly suitable.

Il est à noter que le profil définitif du revêtement 5 ou 6 lui sera généralement conféré par usinage, en même temps que celui des parties métalliques du piston, après montage sur la jupe 3.It should be noted that the final profile of the coating 5 or 6 will generally be given to it by machining, at the same time as that of the metal parts of the piston, after mounting on the skirt 3.

Cependant, il peut être envisagé de prendre des précautions de moulage du revêtement telles qu'un usinage ultérieur de celui-ci ne soit pas nécessaire.However, it may be envisaged to take precautions in molding the coating such that subsequent machining of the latter is not necessary.

En tout cas, et ceci constitue un avantage supplémentaire de l'invention, le profil du revêtement pourra, grâce à ses qualités de glissement considéra­blement améliorées, être grandement simplifié, par rapport aux profils actuels compliqués des jupes métalliques classiques.In any case, and this constitutes an additional advantage of the invention, the profile of the coating can, thanks to its considerably improved sliding qualities, be greatly simplified, compared to the current complicated profiles of conventional metal skirts.

Enfin, il est également envisageable d'élaborer le revêtement par pulvérisation sur la jupe, ce qui simplifierait la fabrication.Finally, it is also possible to develop the spray coating on the skirt, which would simplify manufacturing.

Claims (19)

1. Piston composite, notamment pour moteurs à combustion interne, dont la jupe (3) porte un revêtement (5, 6) à résistance mécanique élevée, à faible coefficient de frottement, constitué d'une résine synthétique armée de fibres à haut module d'élasticité, caractérisé en ce que la résine est de la famille des polymères sulfoniques.1. Composite piston, in particular for internal combustion engines, the skirt (3) of which has a coating (5, 6) of high mechanical strength, with low coefficient of friction, consisting of a synthetic resin reinforced with fibers with high modulus d elasticity, characterized in that the resin is from the family of sulfonic polymers. 2. Piston selon la revendication 1, caractérisé en ce que ladite résine est un polysulfone.2. Piston according to claim 1, characterized in that said resin is a polysulfone. 3. Piston selon la revendication 1, caractérisé en ce que ladite résine est un polyphénylsulfone.3. Piston according to claim 1, characterized in that said resin is a polyphenylsulfone. 4. Piston selon la revendication 1, caractérisé en ce que ladite résine est un polyéthersulfone (PES).4. Piston according to claim 1, characterized in that said resin is a polyethersulfone (PES). 5. Piston selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite résine contient un polymère fluoré du type copolymère éthylène-polytétrafluoréthylène (ETFE).5. Piston according to any one of the preceding claims, characterized in that said resin contains a fluoropolymer of the ethylene-polytetrafluoroethylene copolymer (ETFE) type. 6. Piston selon l'une quelconque des revendica­tions 1 à 4, caractérisé en ce que ladite résine contient du polytétrafluoréthylène (PTFE).6. Piston according to any one of claims 1 to 4, characterized in that said resin contains polytetrafluoroethylene (PTFE). 7. Piston selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdites fibres à haut module d'élasticité sont des fibres de carbone.7. Piston according to any one of the preceding claims, characterized in that said fibers with high modulus of elasticity are carbon fibers. 8. Piston selon l'une quelconque des revendications 1 à 6, caractérisé en ce que lesdites fibres à haut module d'élasticité sont des fibres de verre.8. Piston according to any one of claims 1 to 6, characterized in that said fibers with high modulus of elasticity are glass fibers. 9. Piston selon l'une quelconque des revendi­cations précédentes, caractérisé en ce que ladite résine comporte une charge de graphite.9. Piston according to any one of the preceding claims, characterized in that said resin comprises a graphite filler. 10. Piston selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite résine comporte une charge à hautes propriétés mécaniques telle que des microbilles creuses de verre.10. Piston according to any one of the preceding claims, characterized in that said resin comprises a filler with high mechanical properties such as hollow glass microbeads. 11. Piston selon la revendication 10, caractérisé en ce que ledit revêtement comprend environ 10 à 15 % en poids de microbilles creuses de verre.11. Piston according to claim 10, characterized in that said coating comprises approximately 10 to 15% by weight of hollow glass microbeads. 12. Piston selon l'une quelconque des revendica­tions précédentes, caractérisé en ce que ledit revêtement comprend environ 60 à 80 % en poids de polymère sulfonique, environ 10 % en poids de fibres de carbone, environ 10 % en poids de graphite, et environ 10 % en poids de ETFE.12. Piston according to any one of the preceding claims, characterized in that said coating comprises approximately 60 to 80% by weight of sulphonic polymer, approximately 10% by weight of carbon fibers, approximately 10% by weight of graphite, and approximately 10% by weight of ETFE. 13. Piston selon l'une quelconque des revendi­cations précédentes, caractérisé en ce que ledit revêtement est une pièce rapportée, constituée d'un (5) ou plusieurs (6) éléments.13. Piston according to any one of the preceding claims, characterized in that said coating is an insert, consisting of one (5) or more (6) elements. 14. Piston selon la revendication 13, caractérisé en ce que ledit revêtement est constitué d'un seul élément en forme de bague cylindrique (5) fixée sur ladite jupe (3).14. Piston according to claim 13, characterized in that said coating consists of a single element in the form of a cylindrical ring (5) fixed on said skirt (3). 15. Piston selon la revendication 13, caractérisé en ce que ledit revêtement est constitué de deux éléments en forme de portions de cylindre (6), diamétra­lement opposés sur ladite jupe (3), étant centrés sur l'axe (X-X) perpendiculaire à l'axe d'articulation (Y-Y) du pied de bielle.15. Piston according to claim 13, characterized in that said coating consists of two elements in the form of cylinder portions (6), diametrically opposed on said skirt (3), being centered on the axis (XX) perpendicular to the hinge pin (YY) of the big end. 16. Piston selon la revendication 14, caractérisé en ce que les moyens de fixation dudit revêtement en forme de bague cylindrique (5) sur la jupe (3) comprennent le vissage, le frettage et le collage, moyens utilisés seuls ou dans leurs différentes combinaisons.16. Piston according to claim 14, characterized in that the means for fixing said coating in the form of a cylindrical ring (5) on the skirt (3) comprise screwing, shrinking and bonding, means used alone or in their different combinations . 17. Piston selon la revendication 15, caractérisé en ce que les moyens de fixation desdits éléments (6) sur la jupe (3) comprennent le collage et la fixation mécanique par picots, queue-d'aronde ou rivetage, moyens utilisés seuls ou dans leurs différentes combinaisons.17. Piston according to claim 15, characterized in that the means for fixing said elements (6) on the skirt (3) comprise bonding and mechanical fixing by pins, dovetail or riveting, means used alone or in their different combinations. 18. Piston selon la revendication 16 ou 17, mettant en oeuvre le collage, caractérisé en ce que la colle est du type adhésif polyamide, époxyde ou analogue.18. Piston according to claim 16 or 17, implementing the bonding, characterized in that the glue is of the polyamide, epoxy or similar adhesive type. 19. Piston selon l'une quelconque des revendica­tions 1 à 12, caractérisé en ce que ledit revêtement est élaboré par pulvérisation sur ladite jupe (3).19. Piston according to any one of claims 1 to 12, characterized in that said coating is produced by spraying on said skirt (3).
EP90400207A 1989-01-27 1990-01-24 Composite piston, especially for an internal-combustion engine Withdrawn EP0380415A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8901037 1989-01-27
FR8901037A FR2642475B1 (en) 1989-01-27 1989-01-27 COMPOSITE PISTON, ESPECIALLY FOR INTERNAL COMBUSTION ENGINES

Publications (1)

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EP0380415A1 true EP0380415A1 (en) 1990-08-01

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EP90400207A Withdrawn EP0380415A1 (en) 1989-01-27 1990-01-24 Composite piston, especially for an internal-combustion engine

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EP (1) EP0380415A1 (en)
JP (1) JPH02271059A (en)
FR (1) FR2642475B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0768458A2 (en) * 1993-03-31 1997-04-16 Mahle GmbH Reciprocating piston of an internal combustion engine with an at least partially reinforced running surface
FR2873783A1 (en) * 2004-07-29 2006-02-03 Peugeot Citroen Automobiles Sa Internal combustion engine piston`s skirts coating method, involves coating skirts with paste which has polyaryletherketone polymer, and heating dry lubricating film to temperature such that film assumes amorphous structure
DE102009019688A1 (en) * 2009-04-30 2010-11-11 Federal-Mogul Nürnberg GmbH Piston for internal combustion engine, has piston skirt containing essentially completely rotating longitudinal guide ring within region of open shaft end, where longitudinal guide ring is provided with friction-reducing coating
IT201700007778A1 (en) * 2017-01-25 2018-07-25 Roberto Calissano Manufacturing method of constructive parts of machines or the like and constructive part of machines or the like obtained with said method and machine or the like comprising said constructive parts
DE102018205348A1 (en) * 2018-04-10 2019-10-10 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine and method of manufacturing a piston

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4599892B2 (en) * 2004-05-31 2010-12-15 トヨタ自動車株式会社 Piston and manufacturing method thereof

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3199929A (en) * 1960-12-05 1965-08-10 Reynolds Metals Co Sliding surface protection
US3405610A (en) * 1965-07-14 1968-10-15 Wellworthy Ltd Piston having spray coated inlay
FR2113936A1 (en) * 1970-11-12 1972-06-30 Ici Ltd
FR2253924A1 (en) * 1973-12-10 1975-07-04 Cummins Engine Co Inc
FR2489416A1 (en) * 1980-08-22 1982-03-05 Chevron Res INTERNAL COMBUSTION ENGINE, METHOD FOR NEUTRALIZING THE INCREASE IN THE OCTANE REQUIREMENT IN THIS ENGINE, SYNTACTIC FOAM FOR COATING THE SURFACES OF A COMBUSTION CHAMBER OF SAID ENGINE, AND PISTON AND VALVE FOR THE ENGINE
GB2129523A (en) * 1982-10-20 1984-05-16 Ae Plc Composite pistons

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3199929A (en) * 1960-12-05 1965-08-10 Reynolds Metals Co Sliding surface protection
US3405610A (en) * 1965-07-14 1968-10-15 Wellworthy Ltd Piston having spray coated inlay
FR2113936A1 (en) * 1970-11-12 1972-06-30 Ici Ltd
FR2253924A1 (en) * 1973-12-10 1975-07-04 Cummins Engine Co Inc
FR2489416A1 (en) * 1980-08-22 1982-03-05 Chevron Res INTERNAL COMBUSTION ENGINE, METHOD FOR NEUTRALIZING THE INCREASE IN THE OCTANE REQUIREMENT IN THIS ENGINE, SYNTACTIC FOAM FOR COATING THE SURFACES OF A COMBUSTION CHAMBER OF SAID ENGINE, AND PISTON AND VALVE FOR THE ENGINE
GB2129523A (en) * 1982-10-20 1984-05-16 Ae Plc Composite pistons

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0768458A2 (en) * 1993-03-31 1997-04-16 Mahle GmbH Reciprocating piston of an internal combustion engine with an at least partially reinforced running surface
EP0768458B1 (en) * 1993-03-31 2000-06-07 Mahle GmbH Reciprocating piston of an internal combustion engine with an at least partially reinforced running surface
FR2873783A1 (en) * 2004-07-29 2006-02-03 Peugeot Citroen Automobiles Sa Internal combustion engine piston`s skirts coating method, involves coating skirts with paste which has polyaryletherketone polymer, and heating dry lubricating film to temperature such that film assumes amorphous structure
DE102009019688A1 (en) * 2009-04-30 2010-11-11 Federal-Mogul Nürnberg GmbH Piston for internal combustion engine, has piston skirt containing essentially completely rotating longitudinal guide ring within region of open shaft end, where longitudinal guide ring is provided with friction-reducing coating
IT201700007778A1 (en) * 2017-01-25 2018-07-25 Roberto Calissano Manufacturing method of constructive parts of machines or the like and constructive part of machines or the like obtained with said method and machine or the like comprising said constructive parts
DE102018205348A1 (en) * 2018-04-10 2019-10-10 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine and method of manufacturing a piston
DE102018205348B4 (en) 2018-04-10 2023-11-30 Federal-Mogul Nürnberg GmbH Piston for an internal combustion engine and method for producing a piston

Also Published As

Publication number Publication date
FR2642475B1 (en) 1992-05-29
FR2642475A1 (en) 1990-08-03
JPH02271059A (en) 1990-11-06

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