WO2004003408A1 - Piston segment for internal combustion and compression ignition engine, cylinder and engine comprising same - Google Patents

Piston segment for internal combustion and compression ignition engine, cylinder and engine comprising same Download PDF

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Publication number
WO2004003408A1
WO2004003408A1 PCT/FR2003/001936 FR0301936W WO2004003408A1 WO 2004003408 A1 WO2004003408 A1 WO 2004003408A1 FR 0301936 W FR0301936 W FR 0301936W WO 2004003408 A1 WO2004003408 A1 WO 2004003408A1
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WO
WIPO (PCT)
Prior art keywords
segment
piston
cylinder
internal combustion
compression ignition
Prior art date
Application number
PCT/FR2003/001936
Other languages
French (fr)
Inventor
Arnaud Bald
Didier Strojny
Original Assignee
Renault S.A.S.
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 Renault S.A.S. filed Critical Renault S.A.S.
Priority to EP03761631A priority Critical patent/EP1516136A1/en
Publication of WO2004003408A1 publication Critical patent/WO2004003408A1/en

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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
    • F16J9/12—Details

Definitions

  • the present invention relates to a piston ring for an internal combustion engine and compression ignition, a cylinder equipped with a. such segment as well as an engine as mentioned above containing such a segment.
  • the present invention relates more particularly to a segment for a diesel engine.
  • Exfoliation is a characteristic phenomenon of internal combustion and compression ignition engines such as diesel engines.
  • the term “exfoliation” refers to the locking segment by the scale inside the piston groove in which it is inserted.
  • the scale comes from the coking of the heated oil and mixed with the combustion residues.
  • the coking of the oil is generated by the flow of burnt gases bypassing the piston, this flow is also commonly called “blow by”.
  • the segment which seals the combustion chamber, is an annular part housed in a groove formed in the wall of the piston.
  • the segment is normally guided by an axial (vertical along the axis of the cylinder) and radial clearance in the cylinder. The “gumming” of the segment results in detachment from the barrel and loss of tightness of the combustion chamber.
  • Another solution is to protect the groove containing the segment by a reduced clearance between the piston and the cylinder.
  • Another solution is to increase the axial backlash against the groove in the piston and the segment.
  • trapezium segments and l X trapezoids are relatively expensive and their use generates a flow of burnt gases bypassing the larger piston and an increase in oil consumption.
  • the object of the present invention is to provide a segment for an internal combustion engine and compression ignition whose structure makes it possible to avoid its blocking in the groove of the piston in which it is housed.
  • This object is achieved by means of a segment for the piston of an internal combustion engine and compression ignition which, typically according to the invention, includes abrasion means at its internal diameter.
  • the scale is no longer prevented from entering the groove containing the piston, but the thickness of the layer of scale in formation by abrasion is eliminated or limited.
  • the abrasion means are not limited. They can thus be reported or trained in the segment.
  • the abrasion means comprise a helical thread.
  • the rotation of the segment in its groove thus makes it possible to rub the layer of scale in formation and therefore to wear it thus limiting its thickness and avoiding the gumming of the segment.
  • the pitch of the thread is, for example, between 0.04 mm and 0.6 mm
  • the present invention also relates to a cylinder for an internal combustion engine and compression ignition comprising a piston contained in a cylinder, said piston being equipped with a segment according to the invention and an internal combustion engine and compression ignition comprising at least one cylinder comprising a piston fitted with a segment according to the invention.
  • FIG. 1 shows a partial perspective view of the embodiment of the invention shown in Figure 1.
  • the segment 1 of the invention comprises an upper flank 3, a lower flank 5, an internal diameter 7 and an external diameter 9 or bearing which comes, in FIG. 1, to bear against the surface internal link 11a of a cylinder 11.
  • This segment 1 is housed in a groove 13a formed in the wall of a piston 13.
  • the lower and upper sides 3 and 5 are, in section, parallel to each other and parallel to the walls 13b and 13c of the groove 13a.
  • the inner diameter 7 comprises abrasion means 15 which, in the particular example shown, have the form of a helical thread 15a extending over the entire height h of the inner diameter 7.
  • the pitch p of this thread 15a is of the order of 0.3 mm.
  • the depth d of the thread is of the order of 0.3 mm.
  • the net -15 a consists of a first portion 15b substantially parallel to the sides 3 and 5 and of a second portion 15c forming with the portion 15a an angle of approximately 60 °.
  • the present invention is however not limited to this particular configuration.
  • FIG. 2 shows in more detail the helical thread 15a.
  • This thread 15a can be obtained by tapping a conventional segment with an ordinary tapping tool whose speed of rotation is adapted so as to obtain the desired pitch.
  • the manufacturing cost of the segment of the invention is low compared to the manufacturing cost of a segment of the trapezoid or l ⁇ trapezoid type.
  • Zone C represents the layer of scale.
  • the segment 1 is brought into rotation in its groove 13a around the axis ZZ which is also the axis of symmetry of the piston 13.
  • the friction of the thread 15a against the scale continuously starts the layer of scale C thus preventing it from forms a too thick layer which would block the segment 1 in the groove 13a.
  • the helical shape makes it possible to erode a zone of scale each time different by the rotation of segment 1 and thus ensuring the homogeneity of the destruction of the scale layer.
  • the scale residues formed by abrasion are then driven downwards, in the direction of arrow F, by the flow of burnt gases bypassing the piston.

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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 piston segment (1) for an internal combustion and compression ignition engine. The invention is characterized in that the segment includes at its internal diameter (7) abrading means (15).

Description

Segment pour piston de moteur à combustion interne et allumage par compression, cylindre et moteur contenant un tel segment Segment for piston of internal combustion engine and compression ignition, cylinder and engine containing such a segment
La présente invention concerne un segment pour piston de moteur à combustion interne et allumage par compression, un cylindre équipé d'un . tel segment ainsi qu'un moteur tel que précité contenant un tel segment.The present invention relates to a piston ring for an internal combustion engine and compression ignition, a cylinder equipped with a. such segment as well as an engine as mentioned above containing such a segment.
La présente invention concerne plus particulièrement un segment pour moteur Diesel.The present invention relates more particularly to a segment for a diesel engine.
Le « gommage » est un phénomène caractéristique des moteurs à combustion interne et allumage par compression tels que les moteurs Diesel. Le terme « gommage » désigne le' blocage du segment par la calamine à l'intérieur de la gorge du piston dans laquelle il est inséré. La calamine provient de la cokéfaction de l'huile chauffée et mélangée avec les résidus de combustion. La cokéfaction de l'huile est engendrée par le flux de gaz brûlés contournant le piston, ce flux est encore appelé communément « blow by »."Exfoliation" is a characteristic phenomenon of internal combustion and compression ignition engines such as diesel engines. The term "exfoliation" refers to the locking segment by the scale inside the piston groove in which it is inserted. The scale comes from the coking of the heated oil and mixed with the combustion residues. The coking of the oil is generated by the flow of burnt gases bypassing the piston, this flow is also commonly called "blow by".
Le segment, qui assure l'étanchéité de la chambre de combustion, est une pièce annulaire logée dans une gorge ménagée dans la paroi du piston. Le segment est normalement guidé par un jeu de battement axial (vertical selon l'axe du cylindre) et radial dans le cylindre. Le « gommage » du segment se traduit par un décollement vis à vis du fût et une perte d'étanchéité de la chambre de combustion.The segment, which seals the combustion chamber, is an annular part housed in a groove formed in the wall of the piston. The segment is normally guided by an axial (vertical along the axis of the cylinder) and radial clearance in the cylinder. The “gumming” of the segment results in detachment from the barrel and loss of tightness of the combustion chamber.
Plusieurs solutions existent pour éviter le « gommage ». Une de ces solutions consiste à refroidir le piston au moyen d'un gicleur de fond de piston et d'une galerie intégrée au piston en sorte d'éviter ou du moins de diminuer la cokéfaction de l'huile par abaissement de la température de cette dernière.Several solutions exist to avoid "scrub". One of these solutions consists in cooling the piston by means of a piston bottom nozzle and a gallery integrated in the piston so as to avoid or at least reduce the coking of the oil by lowering the temperature of this last.
Une autre solution consiste à protéger la gorge contenant le segment par un jeu réduit entre le piston et le cylindre. Une autre solution est l'augmentation du jeu de battement axial enfre la gorge ménagée dans le piston et le segment.Another solution is to protect the groove containing the segment by a reduced clearance between the piston and the cylinder. Another solution is to increase the axial backlash against the groove in the piston and the segment.
Une autre solution consiste à utiliser des segments avec des flancs inclinés appelés segments trapèzes ou lA trapèzes. Le refroidissement du piston même associé à L'utilisation de jeux piston-cylindre et piston-segment optimisés peut néanmoins, dans certains s'avérer insuffisant pour empêcher le « gommage » des segments.Another solution consists in using segments with inclined flanks called trapezoidal segments or the A trapeziums. The cooling of the piston itself, associated with the use of optimized piston-cylinder and piston-segment clearances, may nevertheless, in some cases, be insufficient to prevent "erasing" of the segments.
Les segments trapèzes et lX trapèzes précités sont d'un coût relativement élevé et leur utilisation engendre un flux de gaz brûlés contournant le piston plus important et une augmentation de la consommation d'huile.The aforementioned trapezium segments and l X trapezoids are relatively expensive and their use generates a flow of burnt gases bypassing the larger piston and an increase in oil consumption.
Le but de la présente invention est de proposer un segment pour moteur à combustion interne et allumage par compression dont la structure permet d'éviter son blocage dans la gorge du piston dans laquelle il est logé.The object of the present invention is to provide a segment for an internal combustion engine and compression ignition whose structure makes it possible to avoid its blocking in the groove of the piston in which it is housed.
Ce but est atteint au moyen d'un segment pour piston de moteur à combustion interne et allumage par compression qui, de manière caractéristique selon l'invention, comporte au niveau de son diamètre intérieur des moyens d'abrasion.This object is achieved by means of a segment for the piston of an internal combustion engine and compression ignition which, typically according to the invention, includes abrasion means at its internal diameter.
Ainsi selon l'invention, on n'empêche plus la calamine de pénétrer dans la gorge contenant le piston mais on élimine ou limite l'épaisseur de la couche de calamine en formation par abrasion.Thus according to the invention, the scale is no longer prevented from entering the groove containing the piston, but the thickness of the layer of scale in formation by abrasion is eliminated or limited.
Selon l'invention, les moyens d'abrasion ne sont pas limités. Ils peuvent ainsi être rapportés ou formés dans le segment.According to the invention, the abrasion means are not limited. They can thus be reported or trained in the segment.
Selon un mode de réalisation particulier, les moyens d'abrasion comprennent un filet hélicoïdal. La rotation du segment dans sa gorge permet ainsi de frotter la couche de calamine en formation et donc de l'user limitant ainsi son épaisseur et évitant le gommage du segment. Le pas du filet est, par exemple, compris entre 0,04 mm et 0,6 mmAccording to a particular embodiment, the abrasion means comprise a helical thread. The rotation of the segment in its groove thus makes it possible to rub the layer of scale in formation and therefore to wear it thus limiting its thickness and avoiding the gumming of the segment. The pitch of the thread is, for example, between 0.04 mm and 0.6 mm
La présente invention concerne également un cylindre pour moteur à combustion interne et allumage par compression comprenant un piston contenu dans un cylindre, ledit piston étant équipé d'un segment selon l'invention et un moteur à combustion interne et allumage par compression comprenant au moins un cylindre comportant un piston équipé d'un segment selon l'invention.The present invention also relates to a cylinder for an internal combustion engine and compression ignition comprising a piston contained in a cylinder, said piston being equipped with a segment according to the invention and an internal combustion engine and compression ignition comprising at least one cylinder comprising a piston fitted with a segment according to the invention.
La présente invention, ses caractéristiques et les divers avantages qu'elle procure apparaîtront mieux à la lecture de la description qui suit d'un exemple particulier de réalisation de la présente invention et qui fait référence aux dessins annexés sur lesquels : - la figure 1 représente une vue partielle, en coupe selon l'axe Z, d'un mode de réalisation du segment selon l'invention, lorsque celui-ci est logé dans la gorge du piston ;The present invention, its characteristics and the various advantages which it provides will appear more clearly on reading the description which follows of a particular embodiment of the present invention and which refers to the appended drawings in which: - Figure 1 shows a partial view, in section along the Z axis, of an embodiment of the segment according to the invention, when the latter is housed in the groove of the piston;
- la figure 2 représente une vue partielle en perspective du mode de réalisation de l'invention représenté sur la figure 1.- Figure 2 shows a partial perspective view of the embodiment of the invention shown in Figure 1.
En référence à la figure 1, le segment 1 de l'invention comprend un flanc supérieur 3, un flanc inférieur 5, un diamètre intérieur 7 et un diamètre extérieur 9 ou portée qui vient, sur la figure 1, s'appuyer contre la surface interne lia d'un cylindre 11. Ce segment 1 est logé dans une gorge 13a ménagée dans la paroi d'un piston 13. Dans l'exemple représenté, les flancs inférieur et supérieur 3 et 5 sont, en coupe, parallèles entre eux et parallèles aux parois 13b et 13c de la gorge 13a. Le diamètre intérieur 7 comporte des moyens d'abrasion 15 qui, dans l'exemple particulier représenté, ont la forme d'un filet hélicoïdal 15a s 'étendant sur toute la hauteur h du diamètre intérieur 7. Le pas p de ce filet 15a est de l'ordre de 0,3 mm. La profondeur d du filetage est de l'ordre 0,3 mm.With reference to FIG. 1, the segment 1 of the invention comprises an upper flank 3, a lower flank 5, an internal diameter 7 and an external diameter 9 or bearing which comes, in FIG. 1, to bear against the surface internal link 11a of a cylinder 11. This segment 1 is housed in a groove 13a formed in the wall of a piston 13. In the example shown, the lower and upper sides 3 and 5 are, in section, parallel to each other and parallel to the walls 13b and 13c of the groove 13a. The inner diameter 7 comprises abrasion means 15 which, in the particular example shown, have the form of a helical thread 15a extending over the entire height h of the inner diameter 7. The pitch p of this thread 15a is of the order of 0.3 mm. The depth d of the thread is of the order of 0.3 mm.
Dans le mode de réalisation particulier représenté sur la figure 1, le filet -15 a se compose d'une première portion 15b sensiblement parallèle aux flancs 3 et 5 et d'une seconde portion 15c formant avec la portion 15a un angle d'environ 60°. La présente invention n'est néanmoins pas limitée à cette configuration particulière.In the particular embodiment represented in FIG. 1, the net -15 a consists of a first portion 15b substantially parallel to the sides 3 and 5 and of a second portion 15c forming with the portion 15a an angle of approximately 60 °. The present invention is however not limited to this particular configuration.
La figure 2 représente plus en détails le filet hélicoïdal 15a. Ce filet 15a peut être obtenu par taraudage d'un segment conventionnel avec un outil de taraudage ordinaire dont la vitesse de rotation est adaptée en sorte d'obtenir le pas désiré. Ainsi, le coût de fabrication du segment de l'invention est faible comparé au coût de fabrication d'un segment du type trapèze ou lX trapèze.Figure 2 shows in more detail the helical thread 15a. This thread 15a can be obtained by tapping a conventional segment with an ordinary tapping tool whose speed of rotation is adapted so as to obtain the desired pitch. Thus, the manufacturing cost of the segment of the invention is low compared to the manufacturing cost of a segment of the trapezoid or l × trapezoid type.
Le mode d'action du segment de l'invention va maintenant être décrit en référence à la figure 1. La zone C représente la couche de calamine. Le segment 1 est amené en rotation dans sa gorge 13a autour de l'axe ZZ qui est également l'axe de symétrie du piston 13. Le frottement du filet 15a contre la calamine entame continuellement la couche de calamine C évitant ainsi qu'elle ne forme une couche trop épaisse qui bloquerait le segment 1 dans la gorge 13a. La forme hélicoïdale permet d'éroder une zone de calamine à chaque fois différente de par la rotation du segment 1 et d'assurer ainsi l'homogénéité de la destruction de la couche de calamine. Les résidus de calamine formés par abrasion sont ensuite entraînés vers le bas, selon la direction de la flèche F, par le flux de gaz brûlés contournant le piston. The mode of action of the segment of the invention will now be described with reference to FIG. 1. Zone C represents the layer of scale. The segment 1 is brought into rotation in its groove 13a around the axis ZZ which is also the axis of symmetry of the piston 13. The friction of the thread 15a against the scale continuously starts the layer of scale C thus preventing it from forms a too thick layer which would block the segment 1 in the groove 13a. The helical shape makes it possible to erode a zone of scale each time different by the rotation of segment 1 and thus ensuring the homogeneity of the destruction of the scale layer. The scale residues formed by abrasion are then driven downwards, in the direction of arrow F, by the flow of burnt gases bypassing the piston.

Claims

REVENDICATIONS
1. Segment (1) pour piston de moteur à combustion interne et allumage par compression caractérisé en ce qu'il comporte au niveau de son diamètre intérieur (7) des moyens d'abrasion (15) qui comprennent un filet hélicoïdal (15a).1. Segment (1) for piston of internal combustion engine and compression ignition characterized in that it comprises at its internal diameter (7) abrasion means (15) which comprise a helical thread (15a).
2. Segment (1) selon la revendication 1, caractérisé en ce que ledit pas (p) dudit filet (15a) est compris entre 0,04 et 0,6 mm.2. Segment (1) according to claim 1, characterized in that said pitch (p) of said thread (15a) is between 0.04 and 0.6 mm.
3. Segment (1) selon la revendication 1 ou 2, caractérisé en ce que la profondeur (d ) du filetage est de l'ordre de 0,3 mm.3. Segment (1) according to claim 1 or 2, characterized in that the depth (d) of the thread is of the order of 0.3 mm.
4. Segment (1) selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit filet (15a) comporte une première portion (15b) sensiblement parallèle aux flancs (3 ; 5) dudit segment (1) et une seconde portion (15c) formant avec ladite première portion (15b) un angle d'environ 60°.4. Segment (1) according to any one of claims 1 to 3, characterized in that said net (15a) comprises a first portion (15b) substantially parallel to the sides (3; 5) of said segment (1) and a second portion (15c) forming with said first portion (15b) an angle of approximately 60 °.
5. Cylindre pour moteur à combustion interne et allumage par compression comprenant un piston contenu dans un cylindre caractérisé en ce qu'il comporte en outre un segment selon la revendication 15. Cylinder for internal combustion engine and compression ignition comprising a piston contained in a cylinder characterized in that it further comprises a segment according to claim 1
6. Moteur à combustion interne et allumage par compression comprenant au moins un cylindre comportant un piston caractérisé en ce que ledit piston est équipé d'un segment selon l'une quelconque des revendications 1 à 4. 6. Internal combustion engine and compression ignition comprising at least one cylinder comprising a piston characterized in that said piston is equipped with a segment according to any one of claims 1 to 4.
PCT/FR2003/001936 2002-06-26 2003-06-24 Piston segment for internal combustion and compression ignition engine, cylinder and engine comprising same WO2004003408A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03761631A EP1516136A1 (en) 2002-06-26 2003-06-24 Piston segment for internal combustion and compression ignition engine, cylinder and engine comprising same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0207933A FR2841600B1 (en) 2002-06-26 2002-06-26 SEGMENT FOR INTERNAL COMBUSTION ENGINE PISTON AND COMPRESSION IGNITION, CYLINDER AND MOTOR CONTAINING SUCH A SEGMENT
FR02/07933 2002-06-26

Publications (1)

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WO2004003408A1 true WO2004003408A1 (en) 2004-01-08

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PCT/FR2003/001936 WO2004003408A1 (en) 2002-06-26 2003-06-24 Piston segment for internal combustion and compression ignition engine, cylinder and engine comprising same

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EP (1) EP1516136A1 (en)
FR (1) FR2841600B1 (en)
WO (1) WO2004003408A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8117886B2 (en) * 2006-06-23 2012-02-21 Inficon Gmbh Leak detector with a leak detector testing device
CN108999717A (en) * 2018-08-15 2018-12-14 全椒县全动机械有限公司 A kind of diesel engine piston structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1375095A (en) * 1921-04-19 Piston-ring
US1499571A (en) * 1920-11-11 1924-07-01 Morris A Davis Piston ring
US4371174A (en) * 1980-01-04 1983-02-01 Mahle Gmbh Compression rings for pistons

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1375095A (en) * 1921-04-19 Piston-ring
US1499571A (en) * 1920-11-11 1924-07-01 Morris A Davis Piston ring
US4371174A (en) * 1980-01-04 1983-02-01 Mahle Gmbh Compression rings for pistons

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8117886B2 (en) * 2006-06-23 2012-02-21 Inficon Gmbh Leak detector with a leak detector testing device
CN108999717A (en) * 2018-08-15 2018-12-14 全椒县全动机械有限公司 A kind of diesel engine piston structure

Also Published As

Publication number Publication date
FR2841600B1 (en) 2005-05-06
FR2841600A1 (en) 2004-01-02
EP1516136A1 (en) 2005-03-23

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