WO1999037941A1 - Internal combustion engine piston - Google Patents
Internal combustion engine piston Download PDFInfo
- Publication number
- WO1999037941A1 WO1999037941A1 PCT/FR1999/000097 FR9900097W WO9937941A1 WO 1999037941 A1 WO1999037941 A1 WO 1999037941A1 FR 9900097 W FR9900097 W FR 9900097W WO 9937941 A1 WO9937941 A1 WO 9937941A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piston
- holes
- head
- groove
- internal combustion
- Prior art date
Links
Classifications
-
- 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
-
- 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
- F16J9/08—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction with expansion obtained by pressure of the medium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
Definitions
- the present invention relates to pistons for internal combustion engines, of the type comprising a head and a skirt having a plurality of grooves in the form of a circle with which as many segments are associated.
- the object of the present invention is to eliminate or at least reduce this drawback by simple means and at low cost.
- the invention relates to a piston for internal combustion engines of the type indicated above, characterized in that this piston has a plurality of axial holes hollowed out from the head of the piston, in parallel at its axis, and opening onto the first groove of the piston which is closest to the head, these holes being spaced from the external wall of the piston, each hole opening at least partly on the bottom wall of this first groove.
- FIG. 1 is a perspective view of a piston according to the invention.
- FIG. 1 is a sectional view of a detail of the piston of Figure 1.
- the number 1 indicates as a whole a piston of a two-stroke engine for a competition motorcycle. It is obvious, however, that, even if the attached drawings relate to this example, the invention is applicable to engines of any type, either two-stroke or four-stroke.
- the piston 1 has a head 2 and a skirt 3 in which the grooves 4, 5, 6 are designed for receiving the same number of segments.
- FIG. 2 schematically illustrates a detail of the piston 1, a portion of the wall 7 of the cylinder in which the piston is slidably mounted, and two segments 8, 9 respectively associated with the first groove 4, closest to the head 2, and of the second groove 5.
- each groove is defined by a cylindrical bottom wall 4a, 5a and by two opposite, spaced apart plane walls 4b, 5b.
- the segments 8, 9 are produced according to the traditional technique in form split elastic rings, the outer surface of which is in rubbing contact on the wall 7 of the cylinder.
- axial holes 10 in the example illustrated a series in the form of a circle of eight holes in equidistant angles between them) which extend parallel to the axis of the piston 1 and which open into the first groove 4.
- each hole 10 opens at least partially on the bottom wall 4a of the first groove 4.
- the annular chamber 11 comprised between the bottom wall 4a and the interior wall of the segment 8 is constantly in communication with the engine compression chamber.
- the invention is applicable to any type of piston and to any type of engine, two-stroke and four-stroke.
- the arrangement of the holes 10 could also be different from that illustrated, it being understood that these holes must be hollowed out so as to be spaced from the external wall of the piston and must each lead at least partially to the bottom wall of the first groove of the piston.
- the holes 10 had a diameter of 0.6 mm. In the case of a 125cc engine, the holes have, for example, a diameter of 0.8mm.
- the invention can be applied either to petrol or diesel engines.
- the conformation and the arrangement of the 10 holes can be any and even different from one hole to another.
- the holes may also have a non-circular section and an axis inclined relative to the axis of the piston.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention concerns an internal combustion engine piston comprising a plurality of holes (10) bored from the piston head (2) parallel to the axis thereof and opening on the first piston groove (4) closest to the head (2). Said holes (10) are spaced from the piston outer wall and each hole opens at least partly on said first groove (4) base wall (4a).
Description
PISTON E MOTEUR A OOCUSπO DflEraE PISTON AND MOTOR WITH OOCUSπO DflEraE
La présente invention se rapporte aux pistons pour moteurs à combustion interne, du type comprenant une tête et une jupe présentant une pluralité de rainures en forme de cercle auxquelles sont associés autant de segments .The present invention relates to pistons for internal combustion engines, of the type comprising a head and a skirt having a plurality of grooves in the form of a circle with which as many segments are associated.
Des études et des expériences menées par le demandeur, notamment sur des moteurs à deux temps pour motocyclettes de compétition, ont montré que dans les pistons de type traditionnel la faible étanchéité des segments du piston produit une diminution du rapport de compression effectif à cause des suintements de gaz entre le piston et le cylindre en particulier au cours de la phase de compression.Studies and experiments carried out by the applicant, in particular on two-stroke engines for competition motorcycles, have shown that in traditional type pistons the poor tightness of the piston rings produces a reduction in the effective compression ratio due to seepage gas between the piston and the cylinder in particular during the compression phase.
Le but de la présente invention est d'éliminer ou du moins réduire cet inconvénient par des moyens simples et de faible coût.The object of the present invention is to eliminate or at least reduce this drawback by simple means and at low cost.
En vue d'atteindre ce but, l'invention a pour objet un piston pour moteurs à combustion interne du type indiqué plus haut, caractérisé par le fait que ce piston présente une pluralité de trous axiaux creusés à partir de la tête du piston, parallèlement à son axe, et débouchant sur la première rainure du piston qui est la plus près de la tête, ces trous étant espacés de la paroi extérieure du piston, chaque trou débouchant au moins en partie sur la paroi de fond de cette première rainure.In order to achieve this object, the invention relates to a piston for internal combustion engines of the type indicated above, characterized in that this piston has a plurality of axial holes hollowed out from the head of the piston, in parallel at its axis, and opening onto the first groove of the piston which is closest to the head, these holes being spaced from the external wall of the piston, each hole opening at least partly on the bottom wall of this first groove.
Grâce à cette caractéristique, au cours de la phase de compression, une partie des gaz comprimés arrive, à travers ces trous axiaux, dans la chambre annulaire comprise entre la paroi de fond de la première rainure et la surface intérieure du segment qui lui est associé. De cette façon, la pression existante dans la
chambre de compression est transmise aussi à cette chambre de manière à pousser le segment radialement vers l'extérieur, contre la paroi du cylindre, assurant une étanchéité optimale contre le suintement des gaz .Thanks to this characteristic, during the compression phase, a part of the compressed gases arrives, through these axial holes, in the annular chamber comprised between the bottom wall of the first groove and the interior surface of the segment associated with it. . In this way, the pressure existing in the compression chamber is also transmitted to this chamber so as to push the segment radially outwards, against the wall of the cylinder, ensuring an optimal seal against the seepage of gases.
La découverte sera maintenant décrite en référence aux croquis annexés, fournis purement à titre d'exemple non exhaustif, où :The discovery will now be described with reference to the attached sketches, provided purely by way of non-exhaustive example, where:
- la figure 1 est une vue en perspective d'un piston suivant l'invention etFIG. 1 is a perspective view of a piston according to the invention and
- la figure 2 est une vue en coupe d'un détail du piston de la figure 1.- Figure 2 is a sectional view of a detail of the piston of Figure 1.
En référence aux croquis, le numéro 1 indique dans son ensemble un piston d'un moteur à deux temps pour une motocyclette de compétition. Il est évident toutefois que, même si les croquis annexés se rapportent à cet exemple, l'invention est applicable à des moteurs de n'importe quel type, soit à deux temps, soit à quatre temps.Referring to the sketches, the number 1 indicates as a whole a piston of a two-stroke engine for a competition motorcycle. It is obvious, however, that, even if the attached drawings relate to this example, the invention is applicable to engines of any type, either two-stroke or four-stroke.
En référence à la figure 1, le piston 1 présente une tête 2 et une jupe 3 dans laquelle sont creusées les rainures 4, 5, 6 destinées à recevoir le même nombre de segments. La figure 2 illustre de façon schématique un détail du piston 1, une portion de la paroi 7 du cylindre dans lequel le piston est monté de manière coulissante, et deux segments 8, 9 respectivement associés à la première rainure 4, la plus près de la tête 2, et de la seconde rainure 5. Selon la technique traditionnelle, chaque rainure est définie par une paroi cylindrique de fond 4a, 5a et par deux parois planes opposées et espacées 4b, 5b. Les segments 8, 9 sont réalisés suivant la technique traditionnelle en forme
d'anneaux élastiques fendus, dont la surface extérieure est en contact frottant sur la paroi 7 du cylindre.Referring to Figure 1, the piston 1 has a head 2 and a skirt 3 in which the grooves 4, 5, 6 are designed for receiving the same number of segments. FIG. 2 schematically illustrates a detail of the piston 1, a portion of the wall 7 of the cylinder in which the piston is slidably mounted, and two segments 8, 9 respectively associated with the first groove 4, closest to the head 2, and of the second groove 5. According to the traditional technique, each groove is defined by a cylindrical bottom wall 4a, 5a and by two opposite, spaced apart plane walls 4b, 5b. The segments 8, 9 are produced according to the traditional technique in form split elastic rings, the outer surface of which is in rubbing contact on the wall 7 of the cylinder.
Suivant l'invention, à partir de la tête 2 du piston sont creusés plusieurs trous axiaux 10 (dans l'exemple illustré une série en forme de cercle de huit trous en angles équidistants entre eux) qui s'étendent parallèlement à l'axe du piston 1 et qui débouchent dans la première rainure 4.According to the invention, from the head 2 of the piston are hollowed out several axial holes 10 (in the example illustrated a series in the form of a circle of eight holes in equidistant angles between them) which extend parallel to the axis of the piston 1 and which open into the first groove 4.
Comme on le voit clairement sur la figure 2, chaque trou 10 débouche au moins en partie sur la paroi de fond 4a de la première rainure 4. De cette manière, la chambre annulaire 11 comprise entre la paroi de fond 4a et la paroi intérieure du segment 8 est constamment en communication avec la chambre de compression du moteur.As can be clearly seen in FIG. 2, each hole 10 opens at least partially on the bottom wall 4a of the first groove 4. In this way, the annular chamber 11 comprised between the bottom wall 4a and the interior wall of the segment 8 is constantly in communication with the engine compression chamber.
Par conséquent, au cours du fonctionnement du moteur, en particulier au cours de la phase de compression, une partie des gaz présents dans la chambre de compression arrive dans la chambre 4a à travers les trous 10 en transmettant donc à cette chambre la pression existante dans la chambre de compression. Le segment 8, est donc poussé radialement vers l'extérieur par cette même pression existante dans la chambre de compression du moteur par effet de la montée du piston vers le point mort supérieur. Une parfaite étanchéité du segment 8 contre la paroi du cylindre est ainsi assurée, par des moyens simples et de faible coût.Consequently, during the operation of the engine, in particular during the compression phase, part of the gases present in the compression chamber arrives in the chamber 4a through the holes 10 thus transmitting to this chamber the existing pressure in the compression chamber. The segment 8 is therefore pushed radially outwards by the same pressure existing in the compression chamber of the engine by the effect of the rise of the piston towards the upper dead center. Perfect sealing of the segment 8 against the cylinder wall is thus ensured, by simple means and at low cost.
L' étanchéité optimale du segment 8 contre la paroi du cylindre en phase de compression fait en sorte qu'une partie de l'énergie de compression n'est pas gaspillée par effet du suintement de gaz entre le cylindre et le piston, le rendement du moteur est donc
considérablement augmenté, comme les études et les expériences du demandeur l'ont montré.The optimal sealing of the segment 8 against the wall of the cylinder in the compression phase ensures that part of the compression energy is not wasted by the effect of gas seepage between the cylinder and the piston, the efficiency of the engine is therefore considerably increased, as the applicant's studies and experiences have shown.
Naturellement, le principe de la découverte étant entendu, les détails de construction et les formes de réalisation pourront amplement varier par rapport à ce qui est décrit et illustré purement à titre d'exemple, sans pour cela sortir du cadre de la présente invention.Naturally, the principle of discovery being understood, the construction details and the embodiments may vary widely from what is described and illustrated purely by way of example, without departing from the scope of the present invention.
En particulier, comme on l'a déjà indiqué ci- dessus, l'invention est applicable à n'importe quel type de piston et à n'importe quel type de moteur, à deux temps et à quatre temps. De même, la disposition des trous 10 pourrait aussi être différente de celle illustrée, étant entendu que ces trous doivent être creusés de manière a être espacés de la paroi extérieure du piston et doivent déboucher chacun au moins en partie sur la paroi de fond de la première rainure du piston.In particular, as already indicated above, the invention is applicable to any type of piston and to any type of engine, two-stroke and four-stroke. Likewise, the arrangement of the holes 10 could also be different from that illustrated, it being understood that these holes must be hollowed out so as to be spaced from the external wall of the piston and must each lead at least partially to the bottom wall of the first groove of the piston.
Dans un exemple typique, qui se rapporte à un moteur à deux temps de cylindrée 50cm3, les trous 10 avaient un diamètre de 0,6mm. Dans le cas d'un moteur de 125cm3, les trous ont par exemple un diamètre de 0,8mm.In a typical example, which relates to a two-stroke engine with a displacement of 50 cc, the holes 10 had a diameter of 0.6 mm. In the case of a 125cc engine, the holes have, for example, a diameter of 0.8mm.
L'invention peut être appliquée soit à des moteurs à essence, soit Diesel. La conformation et la disposition des 10 trous peut être quelconque et même différente d'un trou à l'autre. Les trous peuvent aussi avoir une section non circulaire et un axe incliné par rapport à l'axe du piston.
The invention can be applied either to petrol or diesel engines. The conformation and the arrangement of the 10 holes can be any and even different from one hole to another. The holes may also have a non-circular section and an axis inclined relative to the axis of the piston.
Claims
1. Piston de moteur à combustion interne, comprenant une tête (2), et une jupe (3) présentant une pluralité de rainures en forme de cercle (4, 5, 6) auxquelles sont associées autant de segments (8, 9), caractérisé par le fait que ce piston présente une pluralité de trous (10) creusés à partir de la tête du piston (2) parallèlement à l'axe de ce dernier et débouchant sur la première rainure (4) du piston qui est la plus près de la tête (2), ces trous (10) étant espacés de la paroi extérieure du piston et chaque trou débouchant au moins en partie sur la paroi de fond (4a) de cette première rainure ( 4 ) .1. Piston of an internal combustion engine, comprising a head (2), and a skirt (3) having a plurality of grooves in the form of a circle (4, 5, 6) with which as many segments (8, 9) are associated, characterized by the fact that this piston has a plurality of holes (10) hollowed out from the head of the piston (2) parallel to the axis of the latter and opening onto the first groove (4) of the piston which is closest of the head (2), these holes (10) being spaced from the outer wall of the piston and each hole opening at least partially on the bottom wall (4a) of this first groove (4).
2. Piston suivant la revendication 1, caractérisé par le fait que ces trous (10) ont un axe parallèle à l'axe du piston.2. Piston according to claim 1, characterized in that these holes (10) have an axis parallel to the axis of the piston.
3. Piston suivant la revendication 1, caractérisé par le fait que ces trous sont répartis en angles équidistants .3. Piston according to claim 1, characterized in that these holes are distributed in equidistant angles.
4. Piston suivant la revendication 1, caractérisé par le fait que le diamètre de ces trous est supérieur à 0,4mm.4. Piston according to claim 1, characterized in that the diameter of these holes is greater than 0.4mm.
Le tout essentiellement comme étant décrit et illustré et pour les buts spécifiés;
The whole essentially as described and illustrated and for the specified purposes;
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITTO980051 ITTO980051A1 (en) | 1998-01-21 | 1998-01-21 | INTERNAL COMBUSTION ENGINE PISTON. |
| ITTO98A000051 | 1998-01-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1999037941A1 true WO1999037941A1 (en) | 1999-07-29 |
Family
ID=11416322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1999/000097 WO1999037941A1 (en) | 1998-01-21 | 1999-01-20 | Internal combustion engine piston |
Country Status (2)
| Country | Link |
|---|---|
| IT (1) | ITTO980051A1 (en) |
| WO (1) | WO1999037941A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107532716A (en) * | 2015-04-22 | 2018-01-02 | 克诺尔轨道车辆***有限公司 | The piston-cylinder apparatus for piston compressor of piston ring with special implementation dynamic sealing |
| WO2018071867A1 (en) * | 2016-10-14 | 2018-04-19 | Etagen, Inc. | Open-faced piston assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2011674A (en) * | 1934-05-25 | 1935-08-20 | Buel H Canady | Piston construction and ring |
| US4154207A (en) * | 1977-07-07 | 1979-05-15 | Ford Motor Company | Piston and ring for reducing HC emissions |
| JPS55129658A (en) * | 1979-03-29 | 1980-10-07 | Micron:Kk | Piston for compressor |
| JPS63308273A (en) * | 1987-06-10 | 1988-12-15 | Topy Ind Ltd | Seal device for piston-cylinder structure |
-
1998
- 1998-01-21 IT ITTO980051 patent/ITTO980051A1/en unknown
-
1999
- 1999-01-20 WO PCT/FR1999/000097 patent/WO1999037941A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2011674A (en) * | 1934-05-25 | 1935-08-20 | Buel H Canady | Piston construction and ring |
| US4154207A (en) * | 1977-07-07 | 1979-05-15 | Ford Motor Company | Piston and ring for reducing HC emissions |
| JPS55129658A (en) * | 1979-03-29 | 1980-10-07 | Micron:Kk | Piston for compressor |
| JPS63308273A (en) * | 1987-06-10 | 1988-12-15 | Topy Ind Ltd | Seal device for piston-cylinder structure |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 004, no. 183 (M - 047) 17 December 1980 (1980-12-17) * |
| PATENT ABSTRACTS OF JAPAN vol. 013, no. 148 (M - 812) 11 April 1989 (1989-04-11) * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107532716A (en) * | 2015-04-22 | 2018-01-02 | 克诺尔轨道车辆***有限公司 | The piston-cylinder apparatus for piston compressor of piston ring with special implementation dynamic sealing |
| WO2018071867A1 (en) * | 2016-10-14 | 2018-04-19 | Etagen, Inc. | Open-faced piston assembly |
| CN109964067A (en) * | 2016-10-14 | 2019-07-02 | 埃塔热发电机股份有限公司 | Open face piston component |
| US10359002B2 (en) | 2016-10-14 | 2019-07-23 | Etagen, Inc. | Open-faced piston assembly |
| US10669969B2 (en) | 2016-10-14 | 2020-06-02 | Mainspring Energy, Inc. | Open-faced piston assembly |
| TWI753028B (en) * | 2016-10-14 | 2022-01-21 | 美商曼斯普林能源股份有限公司 | Open-faced piston assembly and engine |
| US11313318B2 (en) | 2016-10-14 | 2022-04-26 | Mainspring Energy, Inc. | Open-faced piston assembly |
| US11946435B2 (en) | 2016-10-14 | 2024-04-02 | Mainspring Energy, Inc. | Open-faced piston assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| ITTO980051A1 (en) | 1999-07-21 |
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