EP1180199B1 - Blattventile für zweitakt-brennkraftmaschine - Google Patents

Blattventile für zweitakt-brennkraftmaschine Download PDF

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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
Application number
EP00910972A
Other languages
English (en)
French (fr)
Other versions
EP1180199A1 (de
Inventor
Alain Freret
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Celtic Sport Developpement
Original Assignee
Celtic Sport Developpement
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 Celtic Sport Developpement filed Critical Celtic Sport Developpement
Publication of EP1180199A1 publication Critical patent/EP1180199A1/de
Application granted granted Critical
Publication of EP1180199B1 publication Critical patent/EP1180199B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Check Valves (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Claims (7)

  1. Klappenvorrichtung für Zweitaktmotoren, die zwischen einem Vergaser und einem Einlassblock angebracht wird und folgendes umfasst:
    einen internen Diffusionshohlraum, der mindestens eine vom Vergaser kommende Gase aufnehmende Einlassöffnung (6) und mindestens eine Austrittöffnung aufweist, welche den Austritt dieser Gase zum Einlassblock ermöglicht;
    mindestens eine Klappe, welche das selektive Verschließen dieser mindestens einen Einlassöffnung ermöglicht, um das Fließen der Gase in Vergaserrichtung zum Einlassblock für diese Gase zu ermöglichen und den Durchfluss der Gase in die entgegen gesetzte Richtung zu verhindern,
    wobei der innere Hohlraum mindestens drei Austrittöffnungen (7 bis 10) aufweist, die den Austritt dieser Gase nach mindestens drei verschiedene Richtungen (13, 13', 15, 16) ermöglicht, wobei je zwei dieser Richtungen untereinander nicht parallel sein dürfen und wobei jede der mindestens drei Austrittöffnungen selektiv von mindestens einer Klappe verschlossen wird, wobei die Klappenvorrichtung in etwa eine Pyramidenform mit einer rechteckigen Basis (1) aufweist, auf der die mindestens eine Einlassöffnung (6) ausgebildet ist sowie vier Flächen (2 bis 5), die sich aus der Basis heraus erheben und auf einer jeden von denen eine der vier Austrittöffnungen (7 bis 10) ausgebildet ist,
    dadurch gekennzeichnet, dass die Pyramidenform abgeschnitten ist und einen H-förmigen Gipfel aufweist, mit:
    einer mittleren Stange (18), die der Verbindung der oberen Ränder von zwei aus zwei ersten, entgegen liegenden Seiten der rechteckigen Basis (1) aufsteigenden Flächen (2, 3) entspricht;
    zwei seitlichen Stangen (19, 20), die jeweils dem oberen Rand einer der zwei aus zwei zweiten, entgegen liegenden Seiten der rechteckigen Basis (1) aufsteigenden Flächen entsprechen.
  2. Klappenvorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, dass der besagte innere Hohlraum eine Vielzahl von Innenwänden (50) aufweist, die mindestens drei verschiedene Austrittwege bestimmen, die jeweils die mindestens eine Einlassöffnung (6) mit einer der mindestens Austrittöffnungen (7 bis 10) verbindet.
  3. Klappenvorrichtung nach Anspruch 2,
    dadurch gekennzeichnet, dass die besagten Innenwände (50) abgerundete Formen aufweisen.
  4. Klappenvorrichtung nach einem der Ansprüche 1 bis 3,
    dadurch gekennzeichnet, dass die Zahl der Austrittöffnungen der Zahl der verschiedenen Austrittwege gleicht und,
    dass jede der mindestens drei Austrittöffnungen den Austritt der Gase nach einem der Austrittwege ermöglicht.
  5. Klappenvorrichtung nach einem der Ansprüche 1 bis 4,
    dadurch gekennzeichnet, dass die Zahl der Klappen der Zahl der Austrittöffnungen gleicht und, dass jede der mindestens drei Austrittöffnungen selektiv durch eine einzige dieser Klappen verschlossen wird.
  6. Klappenvorrichtung nach einem der Ansprüche 1 bis 5,
    dadurch gekennzeichnet, dass der innere Hohlraum axiale Austrittöffnungen (7, 8) sowie seitliche Austrittöffnungen (9, 10) aufweist und,
    dass diese seitlichen Austrittöffnungen größer sind, als die axialen Austrittöffnungen.
  7. Klappenvorrichtung nach Anspruch 6,
    dadurch gekennzeichnet, dass die Klappen, welche die axialen Austrittöffnungen (7, 8) verschließen, stärker sind, als die Klappen, welche die seitlichen Austrittöffnungen (9, 10) verschließen.
EP00910972A 1999-03-16 2000-03-16 Blattventile für zweitakt-brennkraftmaschine Expired - Lifetime EP1180199B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9903485A FR2791086B1 (fr) 1999-03-16 1999-03-16 Dispositif a clapets pour moteur a deux temps
FR9903485 1999-03-16
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 (de) 2002-02-20
EP1180199B1 true EP1180199B1 (de) 2004-09-15

Family

ID=9543441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00910972A Expired - Lifetime EP1180199B1 (de) 1999-03-16 2000-03-16 Blattventile für zweitakt-brennkraftmaschine

Country Status (6)

Country Link
EP (1) EP1180199B1 (de)
AT (1) ATE276433T1 (de)
AU (1) AU3299500A (de)
DE (1) DE60013809D1 (de)
FR (1) FR2791086B1 (de)
WO (1) WO2000055479A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
FR2791086B1 (fr) 2002-04-26
WO2000055479A1 (fr) 2000-09-21
FR2791086A1 (fr) 2000-09-22
EP1180199A1 (de) 2002-02-20
DE60013809D1 (de) 2004-10-21
ATE276433T1 (de) 2004-10-15
AU3299500A (en) 2000-10-04

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