EP1180199B1 - Dispositif a clapets pour moteur a deux temps - Google Patents
Dispositif a clapets pour moteur a deux temps Download PDFInfo
- Publication number
- EP1180199B1 EP1180199B1 EP00910972A EP00910972A EP1180199B1 EP 1180199 B1 EP1180199 B1 EP 1180199B1 EP 00910972 A EP00910972 A EP 00910972A EP 00910972 A EP00910972 A EP 00910972A EP 1180199 B1 EP1180199 B1 EP 1180199B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outlet openings
- gases
- valve device
- flow
- flap valve
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
- F01L3/205—Reed valves
Definitions
- the field of the invention is that of two-stroke engines, used in particular, but not exclusively, in all-terrain vehicles, motorcycles motocross, snowmobiles, U.L.M., etc.
- the invention relates to a valve device for an engine in two stages.
- a valve device for an engine in two stages.
- intake block we generally mean cylinders or the low engine.
- valve device "V” qualified aisni because of its profile (see fig. 2A). It is now described briefly, in relation with FIGS. 1A, 2A, 3A and 4A, which show views from above, from the side, of front and back respectively.
- This "V” device has a substantially prism-based form triangular, with two lateral faces 21 and 22 of triangular shape, one face front 23 rectangular, and two upper rear faces 24 and lower 25, also of rectangular shape.
- a flange 26 surrounds the front face 23 all around, so that the valve device can be attached to the carburetor (not shown), directly or via a mounting part intermediate. This fixing is generally carried out by screws, thanks to openings 27 provided for this purpose in the collar 26.
- the interior of the prism constitutes an internal gas diffusion cavity, having an inlet port 28 and four outlet ports 29 to 32.
- the port inlet 28 is formed on the front face 23. It corresponds substantially to all of the surface of it. It receives gases from the carburetor.
- the orifices there are two upper outlet ports 29 and 30, and two ports lower outlet 31 and 32. They are formed on the upper rear faces 24 and lower 25 respectively. They allow the flow of gases to the block of admission (not shown).
- Each of the outlet ports 29 to 32 is selectively closed by a valve 33 to 36.
- the valves are held on one of their sides by flaps 39 and 40, themselves fixed to the upper rear 24 and lower 25 faces by screws 41.
- the gases from the carburetor pass through the internal cavity and lift the valves (see arrows referenced 37 and 38). So they flow to the intake block in high and low axial directions (see arrows referenced 44 to 46) parallel to plane 43 of right-left symmetry of the "V" device.
- the gases coming from the block intake which cannot lift the valves, remain blocked without being able flow to the carburetor.
- the cavity internal has a plurality of internal walls 42.
- the latter have the form angular and define four separate flow paths, each connecting the inlet port 28 to one of the four outlet ports 29 to 32.
- valve device "V” the gas flow is done only in high and low axial directions. Indeed, the flow gas is carried forward on the one hand from above (via the two orifices adjacent upper exit 29 and 30) and secondly from below (via the two adjacent lower outlet ports 31 and 32).
- part of the gases must be directed to the sides, via lateral transfer elements.
- the flow received by the intake block must be divided into a central flow and at least two lateral flows.
- Such a division of the flow unfortunately causes turbulence in the intake block (gases swirl at the output of the device "in V"), and therefore a loss of power of the engine. This loss of power becomes all the more important in motorized competitions. where the slightest gain in engine power can be a decisive advantage for competitors.
- crankshaft located, within the engine, downstream
- the rotation of the crankshaft disturbs the gases directed according to the central flow and therefore increases the vortex effect at the output of the "V" device.
- the flow division at the inlet of the intake block is even worse, and therefore the loss of engine power is even bigger.
- valve device "W” obtained by superposition of two “V” valve devices.
- This "W” device presents the same drawbacks as that "in V” described above, since the flow gas is only done in high and low, parallel axial directions to the right-left plane of symmetry of the "V” device. It will therefore not be described in detail here.
- the invention particularly aims to overcome these different disadvantages of the state of the art.
- one of the objectives of the present invention is to provide a valve device for a two-stroke engine, making it possible to improve the gas flow between the carburetor and the intake block. and so increase the engine power output.
- the invention also aims to provide such a device does not showing no turbulence along the gas flow paths defined within its internal cavity.
- Another object of the invention is to provide such a device allowing to reduce the friction effects of the valves.
- said internal cavity has at least three outlet orifices, allowing said gases to flow in at least three directions of flow distinct and not parallel to each other two by two.
- each of said at at least three outlet orifices is selectively closed by at least one valve.
- the general principle of the invention therefore consists in increasing the number gas flow directions, at the outlet of the valve device.
- these gas flow directions can be arbitrary.
- the valve device according to the invention may have, in addition to the top and bottom axial directions, one or more additional directions lateral (s), allowing to pre-direct part of the gas flow. In this way, we improves the circulation of gases at the inlet and within the intake block, and thereby even the efficiency of the engine.
- the rotation effect of the crankshaft on the part of the gas flow pre-directed in separate directions axial directions.
- said internal cavity comprises a plurality of internal walls, defining at least three distinct flow paths, connecting each said at least one inlet port to one of said at least three inlet ports exit.
- said internal walls have shapes rounded. In this way, the formation of turbulence points is avoided as well as the friction effects of the valves. The yield of the engine.
- said device has a shape that is substantially pyramidal, with: on the one hand, a polygonal base, having at least three sides, and on which said at least one inlet orifice is formed; And on the other hand, at least three faces from said base, and on each of which is formed one said at least three outlet ports.
- the total number of directions of flow is equal in this case to the number of sides of the polygonal base, and therefore also to the number of faces from this base.
- said device has a substantially pyramidal shape, with a rectangular base, on which is formed said at least one inlet, and four faces, from said base and on each of which is formed one of four outlet orifices.
- there are four distinct directions of flow such as by example two axial directions. high and low respectively, and two directions lateral, left and right respectively.
- the two lateral directions allow pre-directing the gases, at the outlet of the valve device. towards lateral transfer elements of the intake block.
- said pyramidal shape is truncated and has an H-shaped apex, with a central bar, corresponding to the junction upper edges of two faces from two opposite first sides of said rectangular base, and two side bars, each corresponding to the edge upper of one of the two faces from two opposite second sides of said rectangular base.
- the device to valves according to the present invention can be seen, for simplification, as the complex combination of a first "V" valve device and two halves a second valve device "V", obtained by cutting the latter according to its plane of symmetry up-down: each of the two halves being affixed, by its new face resulting from the cut (i.e. after a quarter turn rotation around the front-rear plane of symmetry), at one of the side faces (shaped triangular) of the first "V” device.
- the number of outlet openings is equal to the number separate flow directions, and each of said at least three orifices of outlet allows the flow of said gases in one of said directions flow.
- the number of valves is equal to the number of orifices of outlet, and each of said at least three outlet ports is selectively closed by only one of said valves.
- said internal cavity has outlet orifices axial and lateral outlet openings, and the size of said outlet openings lateral is greater than that of said axial outlet orifices.
- most of the gases typically around 90 %) flow into the side transfer elements of the intake block.
- valves closing said axial outlet orifices have a thickness greater than that of the valves closing said orifices of side outlet. In this way, it is taken into account that the valves do not undergo not all the same pressure.
- the invention therefore relates to a valve device for two-engine time.
- this device has substantially the shape of a truncated pyramid.
- This pyramid has a rectangular base (or front face) 1, on which is formed an inlet 6, and four rear faces (upper 2, lower 3, left 4 and right 5 respectively), from base 1 and on which are formed four outlet ports (upper 7, lower 8, left 9 and right 10 respectively). Note that in the front view of Figure 3B, there are partially, through the inlet 6, the four outlet 7 to 10.
- a flange 11 surrounds the front face 1 around its entire periphery (or made integral part thereof), so as to allow the attachment of the device to valves on the carburetor (not shown), directly or via a piece of intermediate mounting.
- This fixing is generally carried out by screws, thanks to openings 12 provided for this purpose in the collar.
- the pyramid includes an internal gas diffusion cavity. connecting the inlet 6 to the four outlet ports 7 to 10.
- the inlet receives the gas from the carburetor.
- the outlet ports allow the flow of gas to the intake block (not shown).
- the top of the pyramid is H-shaped (see fig.4B).
- the central bar 18 du H corresponds to the junction of the upper edges of the two rear faces upper 2 and lower 3.
- the two side bars 19 and 20 of the H each correspond to the upper edge of one of the two left rear faces 4 and right 5.
- the internal cavity comprises a plurality of internal walls 50.
- the latter have rounded shapes and define four separate flow paths, each connecting the inlet to one of the four outlet ports.
- the two upper 7 and lower 8 outlet ports are smaller than that of the two left outlet ports 9 and right 10 (or lateral).
- valves (not shown) closing the upper outlet 7 and lower outlet 8 have a thickness (for example equal to 0.42 mm) greater than that (for example equal to 0.38 mm) of the valves closing the left 9 and right 10 outlet ports.
- the valve device according to the present invention is for example manufactured as a single piece.
- the material used is for example quality aluminum, meeting international standard 6060 or 6061, so as to have sufficient resistance to deformation and marking caused by the valves. It is clear, however, that other materials can also be used, such as for example baked or molded resins.
- the different inlet and / or outlet orifices can be fitted with stops (not shown), rubber or other material.
Description
- une cavité interne de diffusion, présentant au moins un orifice d'entrée. recevant des gaz provenant du carburateur. et au moins un orifice de sortie, permettant l'écoulement desdits gaz vers le bloc d'admission ;
- au moins un clapet, permettant l'obturation sélective dudit au moins un orifice de sortie, de façon à permettre le passage des gaz dans le sens carburateur vers bloc d'admission de gaz, et empêcher le passage des gaz dans le sens inverse.
- les figures 1A, 2A, 3A et 4A présentent différentes vues. respectivement de dessus, de côté, de devant et de derrière, d'un dispositif à clapets "en V" selon l'art antérieur ;
- les figures 1B, 2B, 3B et 4B présentent différentes vues, respectivement de dessus, de côté, de devant et de derrière, d'un mode de réalisation particulier d'un dispositif à clapets selon la présente invention.
- d'une part des directions axiales haute et basse (cf flèches référencées 15 et 16, fig.1B et 2B), parallèles au plan de symétrie droite-gauche 14 (cf fig.1B) du dispositif "en V" ; d'autre part des directions radiales gauche et droite (cf flèches référencées 13 et 13', fig.1B), parallèles au plan de symétrie haut-bas 17 (cf fig.2B) du dispositif "en V".
Claims (7)
- Dispositif à clapets pour moteur à deux temps, du type destiné à être monté entre un carburateur et un bloc d'admission, et comprenant :une cavité interne de diffusion, présentant au moins un orifice d'entrée (6), recevant des gaz provenant du carburateur, et au moins un orifice de sortie, permettant l'écoulement desdits gaz vers le bloc d'admission ;au moins un clapet, permettant l'obturation sélective dudit au moins un orifice de sortie, de façon à permettre le passage des gaz dans le sens carburateur vers bloc d'admission de gaz, et empêcher le passage des gaz dans le sens inverse,
caractérisé en ce que ladite forme pyramidale est tronquée et possède un sommet en forme de H, avec:une barre centrale (18), correspondant à la jonction des bords supérieurs de deux faces (2, 3) issues de deux premiers côtés opposés de ladite base rectangulaire (1);deux barres latérales (19, 20), correspondant chacune au bord supérieur de l'une des deux faces (4, 5) issues de deux seconds côtés opposés de ladite base rectangulaire (1). - Dispositif à clapets selon la revendication 1, caractérisé en ce que ladite cavité interne comporte une pluralité de parois internes (50), définissant au moins trois chemins d'écoulement distincts, reliant chacun ledit au moins un orifice d'entrée (6) à l'un desdits au moins trois orifices de sortie (7 à 10).
- Dispositif à clapets selon la revendication 2, caractérisé en ce que lesdites parois internes (50) possèdent des formes arrondies.
- Dispositif à clapets selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le nombre d'orifices de sortie est égal au nombre de directions d'écoulement distinctes,
et en ce que chacun desdits au moins trois orifices de sortie permet l'écoulement desdits gaz selon l'une desdites directions d'écoulement. - Dispositif à clapets selon l'une quelconque des revendication 1 à 4, caractérisé en ce que le nombre de clapets est égal au nombre d'orifices de sortie, et en ce que chacun desdits au moins trois orifices de sortie est obturé sélectivement par un seul desdits clapets.
- Dispositif à clapets selon l'une quelconque des revendications 1 à 5, caractérisé en ce que ladite cavité interne présente des orifices de sortie axiaux (7, 8) et des orifices de sortie latéraux (9, 10),
et en ce que la taille desdits orifices de sortie latéraux est supérieure à celle desdits orifices de sortie axiaux. - Dispositif à clapets selon la revendication 6, caractérisé en ce que les clapets obturant lesdits orifices de sortie axiaux (7, 8) possèdent une épaisseur supérieure à celle des clapets obturant lesdits orifices de sortie latéraux (9, 10).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9903485 | 1999-03-16 | ||
FR9903485A FR2791086B1 (fr) | 1999-03-16 | 1999-03-16 | Dispositif a clapets pour moteur a deux temps |
PCT/FR2000/000649 WO2000055479A1 (fr) | 1999-03-16 | 2000-03-16 | Dispositif a clapets pour moteur a deux temps |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1180199A1 EP1180199A1 (fr) | 2002-02-20 |
EP1180199B1 true EP1180199B1 (fr) | 2004-09-15 |
Family
ID=9543441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00910972A Expired - Lifetime EP1180199B1 (fr) | 1999-03-16 | 2000-03-16 | Dispositif a clapets pour moteur a deux temps |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1180199B1 (fr) |
AT (1) | ATE276433T1 (fr) |
AU (1) | AU3299500A (fr) |
DE (1) | DE60013809D1 (fr) |
FR (1) | FR2791086B1 (fr) |
WO (1) | WO2000055479A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3042013A (en) * | 1960-09-12 | 1962-07-03 | Tecumseh Products Co | Fuel supply means for engines |
US3412754A (en) * | 1966-03-15 | 1968-11-26 | Textron Inc | Pyramid reed valve |
JPS57134075A (en) * | 1981-02-12 | 1982-08-19 | Sanshin Ind Co Ltd | Reed valve |
DE4304892C2 (de) * | 1993-02-17 | 1995-04-06 | Juergen Karrenberg | Membrangesteuerter Zweitaktmotor mit runder, elliptischer oder Langloch-Membranform |
-
1999
- 1999-03-16 FR FR9903485A patent/FR2791086B1/fr not_active Expired - Fee Related
-
2000
- 2000-03-16 AU AU32995/00A patent/AU3299500A/en not_active Abandoned
- 2000-03-16 DE DE60013809T patent/DE60013809D1/de not_active Expired - Lifetime
- 2000-03-16 EP EP00910972A patent/EP1180199B1/fr not_active Expired - Lifetime
- 2000-03-16 AT AT00910972T patent/ATE276433T1/de not_active IP Right Cessation
- 2000-03-16 WO PCT/FR2000/000649 patent/WO2000055479A1/fr active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ATE276433T1 (de) | 2004-10-15 |
WO2000055479A1 (fr) | 2000-09-21 |
FR2791086B1 (fr) | 2002-04-26 |
FR2791086A1 (fr) | 2000-09-22 |
AU3299500A (en) | 2000-10-04 |
EP1180199A1 (fr) | 2002-02-20 |
DE60013809D1 (de) | 2004-10-21 |
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