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EP3748151B1 - Unité de formation de mélange et moteur à deux temps doté d'une unité de formation de mélange - Google Patents

Unité de formation de mélange et moteur à deux temps doté d'une unité de formation de mélange Download PDF

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Publication number
EP3748151B1
EP3748151B1 EP20178313.1A EP20178313A EP3748151B1 EP 3748151 B1 EP3748151 B1 EP 3748151B1 EP 20178313 A EP20178313 A EP 20178313A EP 3748151 B1 EP3748151 B1 EP 3748151B1
Authority
EP
European Patent Office
Prior art keywords
channel
mixture
intake
formation unit
unit according
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.)
Active
Application number
EP20178313.1A
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German (de)
English (en)
Other versions
EP3748151A1 (fr
Inventor
Felix Servatius
Wolfgang Luithardt
Horst Denner
Dr. Martin Christoph Arenz
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.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
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Filing date
Publication date
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Publication of EP3748151A1 publication Critical patent/EP3748151A1/fr
Application granted granted Critical
Publication of EP3748151B1 publication Critical patent/EP3748151B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/10—Carburettors having one or more fuel passages opening in valve-member of air throttle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/36—Carburettors having fitments facilitating their cleaning
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
    • F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
    • 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
    • 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
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/04—Cleaning of, preventing corrosion or erosion in, or preventing unwanted deposits in, combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/109—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps having two or more flaps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/08—Carburettors having one or more fuel passages opening in a valve-seat surrounding combustion-air passage, the valve being opened by passing air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/10—Carburettors having one or more fuel passages opening in valve-member of air throttle
    • F02M17/12—Carburettors having one or more fuel passages opening in valve-member of air throttle the valve member being of butterfly type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
    • F02M17/34—Other carburettors combined or associated with other apparatus, e.g. air filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/08—Venturis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M29/00—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/1019—Two-stroke engines; Reverse-flow scavenged or cross scavenged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10216—Fuel injectors; Fuel pipes or rails; Fuel pumps or pressure regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10262—Flow guides, obstructions, deflectors or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M7/00—Carburettors with means for influencing, e.g. enriching or keeping constant, fuel/air ratio of charge under varying conditions
    • F02M7/12—Other installations, with moving parts, for influencing fuel/air ratio, e.g. having valves
    • 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
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M19/00—Details, component parts, or accessories of carburettors, not provided for in, or of interest apart from, the apparatus of groups F02M1/00 - F02M17/00
    • F02M19/08—Venturis
    • F02M19/088—Whirl devices and other atomising means in or on the venturi walls

Definitions

  • the invention relates to a mixture formation unit of the type specified in the preamble of claim 1 and to a two-stroke engine with a mixture formation unit.
  • a mixture formation device namely a carburettor
  • the main fuel nozzle is arranged in a straight channel. This means that the main fuel nozzle can be easily pushed or pressed into the carburettor's base body from the outside.
  • a cover that holds the control membrane and a cover for the fuel pump are arranged on the base body. If the cover that holds the control membrane is mounted on the base body, the channel in which the main fuel nozzle is arranged is only accessible from the intake channel.
  • a float carburetor which feeds a fuel/air mixture into the intake duct using a nozzle.
  • the nozzle is screwed into a duct that opens into one end of the carburetor and protrudes into the duct at a radial distance. This allows air from the intake duct to be sucked into the fuel and to exit into the intake duct together with the fuel as a fuel/air mixture.
  • a carburetor of this type is known.
  • a value range of 0° to 50° is provided for the angle between the center axis of the main fuel nozzle and a perpendicular to the longitudinal axis of the intake duct.
  • the channels of a carburettor are usually manufactured at least partially using machining processes. After the cover of the control chamber has been fitted, the channel in which the main fuel nozzle is located is only accessible from the intake channel. Therefore, cleaning the carburettor after all components have been assembled is only possible to a limited extent. Particles in the fuel-carrying channels can come loose during operation and become stuck in undesirable positions, for example on sensitive components such as valves or the like, thereby disrupting the operation of the carburettor.
  • the invention is based on the object of creating a mixture formation unit of the generic type which is highly robust in operation and is easy to clean.
  • a further object of the invention is to provide a two-stroke engine with a mixture formation unit.
  • the channel runs relatively flat in the base body of the mixture formation unit. This results in a favorable arrangement and a good use of the installation space usually available in the mixture formation unit.
  • the central axis of the channel advantageously forms an angle of 0° to 30°, in particular 0° to 25°, with the intake channel longitudinal axis in a cutting plane that contains the intake channel longitudinal axis and runs parallel to the central axis of the channel.
  • the central axis of the channel can therefore lie in the same plane as the intake channel longitudinal axis or run skewed to the intake channel longitudinal axis. If the central axis of the channel runs skewed to the intake channel longitudinal axis, the angle in the cutting plane is measured between a projection of the central axis of the channel perpendicular to the cutting plane and the intake channel longitudinal axis.
  • the in Fig. 1 The schematically illustrated two-stroke engine 1 has a cylinder 2 and a crankcase 4.
  • a combustion chamber 3 is formed in the cylinder 2 and a crankcase interior 6 in the crankcase 4.
  • the crankcase interior 6 and the combustion chamber 3 are separated by a piston 5 that moves back and forth in the cylinder 2.
  • the crankcase interior 6 and the combustion chamber 3 are connected to one another via overflow channels 8.
  • the overflow channels 8 open into the combustion chamber 3 via overflow windows 9.
  • the overflow windows 9 are opened or closed depending on the position of the piston 5 in relation to the combustion chamber 3.
  • the piston 5 drives a rotating crankshaft 7 which is rotatably mounted in the crankcase 4.
  • the two-stroke engine 1 can, for example, be the drive motor in a hand-held working device such as a chainsaw, a cut-off machine, a blower, a hedge trimmer, a sprayer or the like, and the crankshaft 7 can serve to drive a tool of the working device.
  • the tool is usually a fan that conveys a working air flow.
  • the drive motor can also be a four-stroke engine, in particular a mixture-lubricated four-stroke engine.
  • the two-stroke engine 1 has an intake tract with an air filter 49, a mixture formation unit 13 and a connecting piece 41 for connecting the mixture formation unit 13 to the cylinder 2.
  • the mixture formation unit 13 is a carburetor in the exemplary embodiment. Instead of the connecting piece 41, one or more other desired parts can be provided for the fluidic connection of the mixture formation unit 13 to the cylinder 2 or the crankcase 4.
  • the air filter 49 has a filter element 39. Downstream of the filter element 39, a clean room 50 is formed, from which an intake channel 10 leads.
  • An intake channel section 11 is formed in the mixture formation unit 13.
  • a throttle element 17, in the exemplary embodiment a throttle valve, is adjustably mounted in the intake channel section 11. In the exemplary embodiment, the throttle element 17 is mounted with a throttle shaft 18.
  • the cylinder 2 has an outlet 40 from the combustion chamber 3.
  • a main fuel opening 27 and several secondary fuel openings 28 open into the intake channel section 11 in the mixture formation unit 13.
  • the main fuel opening 27 is formed on a main fuel nozzle 29.
  • the main fuel opening 27 opens into the intake channel section 11 in the region of a venturi section 34.
  • the mixture formation unit 13 has a base body 23 which has a first, upstream end face 24 and a second, downstream end face 25.
  • the main fuel nozzle 29 is arranged in a straight channel 26 which extends from the first end face 24 into the intake channel section 11.
  • first end face 24 can also be advantageous for other channels of the mixture formation unit 13.
  • first end face 24, at which the channel 26 opens is the upstream end face.
  • first end face 24, at which the channel 26 opens can also be the downstream end face of the base body 23.
  • the intake duct 10 Downstream of the throttle element 17 in the embodiment according to Fig. 1 the intake duct 10 is divided by a partition 35 into the mixture duct 12 and the air duct 14.
  • the partition 35 On the side facing the throttle element 17, the partition 35 has a system 38 against which the throttle element 17 rests in the fully open position.
  • an opening is formed between the throttle shaft 18 and the system 38, through which fuel can reach the area upstream of the air duct 14.
  • a system 56 for the throttle element 17 is formed on the partition wall section 36.
  • the system 56 is arranged on the side of the partition wall section 36 facing the mixture channel 12.
  • a system 57 for the choke element 20 is formed on the side facing the air channel 12.
  • a channel 26 is provided in the base body 23.
  • the channel 26 is advantageously designed as a straight, continuous bore with a constant diameter.
  • the channel 26 advantageously extends from the front side 24 into the intake channel section 11.
  • the channel 26 is not closed over its entire length over its entire circumference, but is open in the area adjacent to the front side 24 towards the intake channel section 11.
  • the channel 26 is designed to be open in another direction on the circumference over a portion of its length.
  • the channel 26 is open over its entire length in one direction over a portion its circumference is open.
  • the wall delimiting the channel 26 can, for example, be approximately U-shaped in cross section.
  • the channel 26 is advantageously produced by drilling or milling or is produced as a cast structure when the base body 23 is cast.
  • the channel 26 has a central axis 33.
  • the central axis 33 forms an angle ⁇ with the intake channel longitudinal axis 23 that is less than 90°.
  • the angle ⁇ is greater than 0°.
  • an angle of 0° can also be advantageous.
  • the angle ⁇ is preferably from 0° to 30°, in particular from 0° to 25°.
  • the angle ⁇ is measured in a cutting plane that contains the intake channel longitudinal axis 32 and that runs parallel to the central axis 33 of the channel 26.
  • the cutting plane contains both the intake channel longitudinal axis 32 and the central axis 33 and corresponds to the Fig. 2 shown cutting plane.
  • the angle ⁇ between the intake duct longitudinal axis 32 and a projection of the central axis 33 into the cutting plane is measured in a projection direction perpendicular to the cutting plane.
  • the base body 23 of the mixture formation device 13 has a first longitudinal side 58 and a second longitudinal side 59.
  • the longitudinal sides 58 and 59 run approximately parallel to the central axis 32 of the intake channel section 11.
  • a fuel pump 46 is advantageously formed on the first longitudinal side 58.
  • the fuel pump 46 is delimited by the base body 23, a pump cover 47 fixed to the base body 23 and a pump membrane (not shown).
  • the pump cover 47 is preferably screwed to the base body 23 via a fastening screw 48.
  • a control chamber 42 and a compensation chamber 43 are advantageously formed on the opposite longitudinal side 59, which are separated by a control membrane 44.
  • the control membrane 44 is surrounded by a Fig. 2
  • the control chamber 42 is held on the base body 23 by a control chamber cover 62 shown schematically.
  • the control chamber 42 is advantageously coupled in the usual way with a spring-loaded lever to an inlet valve, which Regulates the flow of fuel from the fuel pump 46 into the control chamber 42.
  • the control chamber 42 is connected to secondary fuel openings 28 via a check valve 45.
  • a fuel channel 64 also leads from the control chamber 42, in which a fixed throttle 63 is arranged in the exemplary embodiment. Instead of the fixed throttle 63, an adjustable throttle can be provided, for example.
  • the main fuel nozzle 29 is arranged in the channel 26.
  • An annular gap 30 is formed on the outer circumference of the main fuel nozzle 29, into which the fuel channel 64 opens.
  • the annular gap 30 is delimited by a circumferential groove on the outer circumference of the main fuel nozzle 29 and by the wall of the channel 26.
  • a transverse channel 65 is formed in the main fuel nozzle 29, which in the exemplary embodiment runs perpendicular to the central axis 33, and a longitudinal channel 66, which runs centrally through the main fuel nozzle 29 in the direction of the central axis 33.
  • the annular gap 30 is connected to the longitudinal channel 66 via the transverse channel 65.
  • the longitudinal channel 66 opens at a valve plate 52.
  • the valve plate 52 forms a check valve 31 with a valve seat 54.
  • valve plate 52 When the check valve 31 is closed, the valve plate 52 rests against the valve seat 54. If there is excess pressure in the intake channel section 11 compared to the control chamber 42, the check valve 31 is closed. If there is negative pressure in the intake channel section 11, the valve plate 52 is lifted off the valve seat 54.
  • the check valve 31 has a stop 53 which limits the maximum stroke of the valve plate 52. The stroke of the valve plate 52 is preferably as small as possible.
  • Fig. 3 shows the opening of the channel 26 on the first end face 24.
  • the channel 26 is formed completely in the base body 23 and is at least partially closed over its circumference.
  • the base body 23 has a section 67 which projects into the intake channel section 11.
  • the section 67 reduces the free flow cross-section in the mixture channel 12.
  • the section 67 has a bevel 68 so that the flow cross-section at the section 67 extends in the direction of the arrow 51 ( Fig. 2 ) is enlarged.
  • the bevel 68 is also in Fig. 2
  • the bevel 68 can also be omitted in an alternative design.
  • Fig. 4 shows an embodiment of a mixture formation device 13, the structure of which essentially corresponds to that shown in the Fig. 2 and 3
  • the same reference numerals designate corresponding elements in all figures.
  • Channel 26 is opposite the one in the Fig. 1 and 2 shown version.
  • the channel 26 runs parallel to the intake channel longitudinal axis 32.
  • the central axis 33 of the channel 26 and the intake channel longitudinal axis 32 enclose an angle of 0°, i.e. they run parallel.
  • the mixture formation unit 13 is designed as a carburetor in the exemplary embodiments.
  • a carburetor feeds the fuel into the intake channel due to the negative pressure in the intake channel.
  • another mixture formation unit can also be provided.
  • the mixture formation unit can in particular have a fuel valve that feeds fuel into the intake channel due to the excess pressure of the fuel, in particular injects it into the intake channel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Claims (13)

  1. Unité de formation de mélange comprenant un corps de base (23) dans lequel est formé une section de canal d'admission (11), la section de canal d'admission (11) s'étendant depuis une première face frontale (24) du corps de base (23) à une deuxième face frontale (25) du corps de base (23), l'unité (13) de formation de mélange présentant au moins un canal (26) qui débouche dans la section de canal d'admission (11), et un composant de l'unité (13) de formation de mélange qui présente un clapet anti-retour (31) étant agencé dans le canal (26), l'unité (13) de formation de mélange présentant au moins un orifice de carburant qui débouche dans la section de canal d'admission (11) et qui est formé sur un gicleur de carburant, le gicleur de carburant formant le composant agencé dans le canal (26), l'orifice de carburant étant un orifice de carburant principal (27) et le gicleur de carburant étant un gicleur de carburant principal (29), et l'orifice de carburant principal (27) débouchant dans la section de canal d'admission (11) dans la zone d'une section Venturi (34),
    caractérisée en ce que le canal (26) s'étend en ligne droite et en ce que le canal (26) débouche sur la première face frontale (24) du corps de base (23).
  2. Unité de formation de mélange selon la revendication 1,
    caractérisée en ce que le composant forme avec le canal (26) un espace annulaire (30) qui est relié à l'orifice de carburant.
  3. Unité de formation de mélange selon la revendication 1 ou la revendication 2,
    caractérisée en ce que l'axe central (33) du canal (26) forme un angle (α) de 0° à 30° avec l'axe longitudinal (32) du canal d'admission dans un plan de coupe qui contient l'axe longitudinal (32) du canal d'admission et qui est parallèle à l'axe central (33) du canal (26).
  4. Unité de formation de mélange selon l'une des revendications 1 à 3,
    caractérisée en ce qu'un élément d'étranglement (17) est monté dans le corps de base (23) en aval de la section Venturi (34).
  5. Unité de formation de mélange selon la revendication 4,
    caractérisée en ce que la première face frontale (24) du corps de base (23) est la face frontale amont du corps de base (23).
  6. Unité de formation de mélange selon la revendication 4 ou la revendication 5,
    caractérisée en ce que l'élément d'étranglement (17) est un papillon des gaz.
  7. Unité de formation de mélange selon la revendication 6,
    caractérisée en ce qu'un élément de starter (20) est maintenu dans le corps de base (23) en amont de l'élément d'étranglement (17).
  8. Unité de formation de mélange selon l'une des revendications 4 à 7,
    caractérisée en ce qu'aucune section de cloison n'est agencée en amont de l'élément d'étranglement (17) dans la section de canal d'admission (11).
  9. Unité de formation de mélange selon l'une des revendications 4 à 7,
    caractérisée en ce qu'en amont de l'élément d'étranglement (17), une section de paroi de séparation (36) est agencée dans la section de canal d'admission (11).
  10. Unité de formation de mélange selon l'une des revendications 1 à 9,
    caractérisée en ce que le composant est pressé dans le canal (26).
  11. Moteur à deux temps comprenant une unité de formation de mélange selon l'une des revendications 1 à 10, avec un cylindre (2) dans lequel est formée une chambre de combustion (3) qui est délimitée par un piston (5), le piston (5) entraînant un vilebrequin (7) monté rotatif dans un carter de vilebrequin (4), un espace intérieur (6) de carter de vilebrequin étant relié à la chambre de combustion (3) dans au moins une position du piston (5) par au moins un canal de débordement (8), avec un canal d'admission (10) qui, en aval de la section de canal d'admission (11) formée dans l'unité (13) de formation de mélange, est divisé par une paroi de séparation (35) en un canal de mélange (12) pour l'amenée du mélange carburant/air dans la chambre de combustion (3) et un canal pour l'air (14) pour l'amenée de l'air de pré-rinçage vers l'au moins un canal de débordement (8).
  12. Moteur à deux temps selon la revendication 11,
    caractérisé en ce qu'en amont de l'élément d'étranglement (17), il n'est pas prévu de section de paroi de séparation pour diviser la section de canal d'admission (11) en le canal de mélange (12) et le canal pour l'air (14).
  13. Moteur à deux temps selon la revendication 12,
    caractérisé en ce qu'il est prévu en amont de l'élément d'étranglement (17) une section de paroi de séparation (36) pour diviser la section de canal d'admission (11) en le canal de mélange (12) et le canal pour l'air (14).
EP20178313.1A 2019-06-08 2020-06-04 Unité de formation de mélange et moteur à deux temps doté d'une unité de formation de mélange Active EP3748151B1 (fr)

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DE102019004063.5A DE102019004063A1 (de) 2019-06-08 2019-06-08 Gemischbildungseinheit und Zweitaktmotor mit einer Gemischbildungseinheit

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EP3798439B1 (fr) * 2019-09-30 2025-04-09 Andreas Stihl AG & Co. KG Dispositif d'alimentation en carburant
EP4119782A1 (fr) * 2021-07-15 2023-01-18 Andreas Stihl AG & Co. KG Dispositif d'alimentation en carburant et moteur à deux temps doté d'un dispositif d'alimentation en carburant
EP4187067A1 (fr) * 2021-11-24 2023-05-31 Winterthur Gas & Diesel Ltd. Moteur à combustion interne
SE547505C2 (en) * 2022-05-30 2025-10-07 Husqvarna Ab A fuel system module for hand-held powertools

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Publication number Publication date
CN112049738A (zh) 2020-12-08
CN112049738B (zh) 2024-07-26
EP3748151A1 (fr) 2020-12-09
US11384715B2 (en) 2022-07-12
US20200386192A1 (en) 2020-12-10
DE102019004063A1 (de) 2020-12-10

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