EP3561280B1 - Carburateur et moteur à combustion interne doté d'un carburateur - Google Patents

Carburateur et moteur à combustion interne doté d'un carburateur Download PDF

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Publication number
EP3561280B1
EP3561280B1 EP18400011.5A EP18400011A EP3561280B1 EP 3561280 B1 EP3561280 B1 EP 3561280B1 EP 18400011 A EP18400011 A EP 18400011A EP 3561280 B1 EP3561280 B1 EP 3561280B1
Authority
EP
European Patent Office
Prior art keywords
fuel
chamber
enrichment
pump
internal combustion
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
EP18400011.5A
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German (de)
English (en)
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EP3561280A1 (fr
Inventor
Philipp Kühnle
Klaus Geyer
Michael Grether
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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Priority to EP18400011.5A priority Critical patent/EP3561280B1/fr
Publication of EP3561280A1 publication Critical patent/EP3561280A1/fr
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Publication of EP3561280B1 publication Critical patent/EP3561280B1/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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/16—Other means for enriching fuel-air mixture during starting; Priming cups; using different fuels for starting and normal operation
    • 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
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/08—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically
    • F02M1/10—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling becoming operative or inoperative automatically dependent on engine temperature, e.g. having thermostat
    • 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
    • F02M17/02—Floatless carburettors
    • F02M17/04—Floatless carburettors having fuel inlet valve controlled by diaphragm

Definitions

  • the invention relates to a carburetor of the type specified in the preamble of claim 1 and an internal combustion engine with a carburetor.
  • a carburetor which comprises a fuel pump, a feed pump to be operated by the operator and an enrichment device.
  • the enrichment device is used to feed an increased amount of fuel into the intake duct during start-up.
  • the enrichment device comprises an electromagnetically actuated valve which closes the flow connection into the intake channel as soon as a predetermined amount of fuel has been supplied via the enrichment device after starting.
  • a carburetor emerges which has a fuel pump, a feed pump to be operated by the operator, namely a purger, and an enrichment device, namely a primer.
  • the amount of fuel to be fed into the intake duct via the primer is taken from the fuel that is returned to the fuel tank by the purger.
  • the U.S. 5,711,901 A discloses a carburetor with a fuel pump, feed pump and enrichment device.
  • the pressure in the enrichment chamber is kept constant via a check valve.
  • From the EP 0 306 856 A2 shows a starting device with an electrically driven feed pump.
  • the pressure in the enrichment chamber is kept constant via a check valve.
  • an electromagnetic valve is opened in a fuel line that leads into the intake duct.
  • the invention is based on the object of creating a carburetor of the generic type which has a simple structure and in which a defined amount of fuel can be fed to an internal combustion engine via the enrichment device. Another object of the invention is to provide an internal combustion engine with which starting is facilitated.
  • this object is achieved by a carburetor having the features of claim 1.
  • the object is achieved by an internal combustion engine having the features of claim 12.
  • the carburetor has a fuel pump.
  • the fuel pump is the pump that supplies fuel to the internal combustion engine during operation.
  • the fuel pump advantageously supplies the fuel required for operation when the internal combustion engine is running.
  • the fuel pump can advantageously be driven by the fluctuating pressure in a crankcase interior of the internal combustion engine.
  • the carburetor advantageously has a feed pump that can be operated by an operator.
  • the feed pump is advantageously a so-called purger.
  • the feed pump is used in particular to manually flood the fuel system with fuel and gas bubbles or the like from the fuel system before the internal combustion engine is started to remove.
  • the feed pump is advantageously arranged in such a way that the feed pump feeds fuel from a fuel chamber of the carburetor into a fuel tank.
  • fuel is fed from the at least one fuel chamber into an intake duct section formed in the carburetor.
  • the fuel chamber of the carburetor is in particular a fuel chamber from which one or more fuel openings of the carburetor are fed.
  • the carburetor also has an enrichment device.
  • the enrichment device comprises, in particular, an enrichment pump that is separate from the feed pump.
  • the enrichment device has an enrichment chamber.
  • the enrichment device is designed to supply fuel from the enrichment chamber to the internal combustion engine.
  • the enrichment device is in particular a primer.
  • the enrichment chamber has a variable volume.
  • the feed pump and the enrichment device are preferably coupled in such a way that actuation of the feed pump leads to a change in the volume of the enrichment chamber. The actuation of the feed pump accordingly also leads to a pumping movement in the enrichment chamber.
  • the change in the volume of the enrichment chamber advantageously specifies the volume of fuel to be supplied to the internal combustion engine. With each complete pump stroke of the feed pump, a defined volume of fuel can accordingly be fed to the internal combustion engine via the enrichment device as soon as the fuel system is completely flooded. When the feed pump is fully actuated, a complete pump stroke of the feed pump is carried out.
  • the feed pump can in particular be a purger with an elastic pump bellows. Complete actuation of the feed pump is, in particular, actuation of the pump bellows up to a stop.
  • the number of pump strokes to be carried out with the feed pump is usually specified, for example in an operating manual or the like.
  • the amount of fuel supplied via the enrichment device is predefined, and it it can be ensured that a sufficient amount of fuel for starting the internal combustion engine is supplied to the internal combustion engine.
  • the fuel system is advantageously flooded by the feed pump and the enrichment device at the same time and a predefined amount of fuel is supplied to the internal combustion engine, in particular an intake duct.
  • the feed pump advantageously has a feed chamber.
  • the delivery chamber is partially delimited by an elastic pump bellows which is to be actuated by the operator.
  • the delivery chamber and the enrichment chamber are advantageously separate chambers.
  • the enrichment chamber is delimited by a movable element, for example by a movable stamp or an elastic membrane.
  • the feed pump preferably comprises an elastic element, in particular a pump bellows, the movement of the movable element being coupled to the movement of the elastic element via a coupling element.
  • the coupling element is in particular a rigid coupling element such as a coupling rod or the like.
  • the feed pump and the enrichment device are hydraulically coupled to one another.
  • the hydraulic coupling is advantageously designed in such a way that actuation of the feed pump leads to a change in the volume of the enrichment chamber.
  • the enrichment device and the feed pump are electrically coupled to one another.
  • the electrical coupling is advantageously designed in such a way that actuation of the feed pump leads to a change in the volume of the enrichment chamber.
  • the enrichment chamber is connected upstream of the feed pump.
  • the enrichment chamber is accordingly arranged upstream of the feed pump in relation to a flow direction to a fuel tank.
  • the volume of the enrichment chamber is first filled with fuel and then the volume of the feed pump.
  • the priming pump and the feed pump are filled when an elastic element such as a pump bellows is released by a negative pressure in causes a fuel line.
  • the elastic element is advantageously designed to be transparent. The operator can advantageously use the transparent elastic element to check whether gas bubbles are still present in the fuel system.
  • a first check valve is advantageously arranged in the flow connection from the enrichment chamber to the feed pump. The first check valve ensures that when the feed pump is actuated, no fuel can flow back from the feed chamber into the enrichment chamber.
  • the enrichment device conveys the fuel for the internal combustion engine from the enrichment chamber into a connecting line, in particular into a fuel line.
  • the connecting line is advantageously provided for connection to a crankcase of the internal combustion engine.
  • the connecting line opens in particular into a gas-carrying line which connects an intake duct of the internal combustion engine to a crankcase interior of the internal combustion engine.
  • a second check valve is preferably arranged in the connecting line.
  • the second check valve prevents fuel or air from being sucked into the enrichment chamber.
  • the opening pressure of the second check valve is advantageously lower than the opening pressure of the first check valve. This ensures that fuel is pumped into the connecting line.
  • the feed pump is advantageously arranged in the line path behind the fuel chamber in relation to the direction of flow.
  • the specified direction of flow relates to a suction stroke of the feed pump.
  • the feed pump is accordingly arranged downstream of the fuel chamber.
  • the feed pump is connected downstream of the fuel chamber in relation to the direction of flow.
  • the enrichment chamber is advantageously arranged downstream of the fuel chamber in relation to the flow direction in the line path.
  • the enrichment chamber is accordingly located downstream of the fuel chamber.
  • the enrichment chamber is advantageously arranged in the line path in relation to the direction of flow in front of the fuel chamber. In this configuration, the enrichment chamber is accordingly arranged upstream of the fuel chamber.
  • the enrichment chamber is arranged in the conduit upstream of the fuel chamber, the enrichment chamber is flooded before the fuel chamber when the feed pump is operated by the operator. As a result, after just a few pumping strokes of the feed pump, fuel is delivered to the internal combustion engine via the enrichment chamber.
  • the fuel chamber is advantageously a control chamber of the carburetor.
  • the fuel pump advantageously has a pump chamber which, in particular, is arranged upstream of the fuel chamber of the carburetor in relation to the direction of flow.
  • the fuel chamber is in particular a control chamber of the carburetor.
  • the enrichment chamber can advantageously be arranged in front of the pump chamber or behind the fuel chamber in relation to the direction of flow.
  • the pump chamber and fuel chamber are advantageously arranged directly following one another and separated from one another only by a valve.
  • the carburetor advantageously has two connections for connection to the fuel tank.
  • the enrichment chamber, the delivery chamber and the fuel chamber are arranged in a flow connection of the carburetor from one connection, which is provided in particular for the fuel inflow to the carburetor, to the other connection, which is in particular provided for the fuel outflow. Both Connections are connected to the fuel tank, with fuel being sucked in via one connection and fuel flowing back into the fuel tank via the other connection.
  • the delivery chamber is arranged downstream of the enrichment chamber in relation to the flow direction, that is, it is arranged downstream of the enrichment chamber, so that fuel from the fuel tank first enters the enrichment chamber and then into the delivery chamber.
  • the fuel chamber and the pump chamber can be connected downstream or upstream of the enrichment chamber, that is to say they can be arranged downstream or upstream of the enrichment chamber.
  • the enrichment chamber is flow-connected to a crankcase interior of the internal combustion engine.
  • the fuel is preferably supplied directly to the crankcase interior from the enrichment chamber.
  • the fuel is preferably supplied directly to the crankcase interior from the enrichment chamber.
  • the fuel is not supplied via an intake duct of the internal combustion engine.
  • a supply of fuel from the enrichment chamber into an intake duct of the internal combustion engine is preferably not provided.
  • a switching valve is advantageously arranged in the flow path from the enrichment chamber to the crankcase interior.
  • the fuel, which is additionally supplied via the enrichment chamber can be switched off via the switching valve in order, for example, to prevent the internal combustion engine from becoming too rich when the engine is warm.
  • the switching valve is temperature-actuated. If a warm start is carried out with the internal combustion engine, it is advantageously provided that the switching valve is closed so that no additional fuel is supplied from the enrichment chamber into the crankcase interior.
  • the switching valve is arranged directly on the crankcase. As a result, the temperature of the crankcase can be detected on the switching valve itself and the switching valve can be actuated depending on the temperature of the crankcase. An advantageous, simple design results when the switching valve is a temperature-actuated valve.
  • the switching valve comprises a bimetal.
  • a different design of the switching valve can also be advantageous.
  • Fig. 1 shows schematically an internal combustion engine 1.
  • the internal combustion engine 1 is advantageously a mixture-lubricated engine, in particular a two-stroke engine or a mixture-lubricated four-stroke engine.
  • the internal combustion engine 1 has a cylinder 2 in which a combustion chamber 3 is formed.
  • the combustion chamber 3 is delimited by a piston 5 which is mounted to reciprocate in the cylinder 2.
  • the piston 5 drives a crankshaft 6 in rotation via a connecting rod (not shown).
  • the crankshaft 6 is mounted in a crankcase 4 of the internal combustion engine 1 so as to be rotatable about an axis of rotation 7.
  • the crankcase 4 has a crankcase interior 8 in which the crankshaft 6 rotates.
  • the internal combustion engine 1 has a fuel system 26 which comprises a fuel tank 27 and a carburetor 9.
  • the carburetor 9 has a fuel pump 15 which, during operation, supplies fuel into an intake duct section 10 formed in the carburetor 9.
  • the main fuel opening 12 is arranged in the area of a venturi 11 in the intake duct section 10.
  • a throttle element, in the exemplary embodiment a throttle valve 13, is arranged downstream of the main fuel opening 12.
  • the intake channel section 10 is part of an intake channel 40 which opens into the crankcase interior 8.
  • the carburetor 9 has a feed pump 28 and an enrichment device 29.
  • the enrichment device 29 is designed as an enrichment pump.
  • the enrichment device 29 and the feed pump 28 are advantageously arranged in a housing 59 of the gasifier 9.
  • the enrichment device 29 and the feed pump 28 are shown outside of the gasifier 9 in the illustration for a better overview.
  • the fuel pump 15 sucks via a fuel line 52 from which in Fig. 1 schematically only a section is shown, fuel from the fuel tank 27 on.
  • the fuel line 52 is connected to the fuel tank 27, as in FIG Fig. 1 is shown schematically with a dashed line.
  • the carburetor 9 has two connections for fuel lines, namely a schematically illustrated fuel inlet 57 and a schematically illustrated fuel outlet 58.
  • the fuel line 52 is connected to the fuel inlet 57.
  • the fuel pump 15 is designed as a diaphragm pump and is driven by the fluctuating pressure in the crankcase interior 8.
  • the fuel pump 15 has an inlet valve 19 and an outlet valve 20, which in the exemplary embodiment are designed as check valves.
  • a pump chamber 18 is located between the inlet valve 19 and the outlet valve 20 in the flow direction 60.
  • the pump chamber 18 is delimited by a pump membrane 16.
  • the pump membrane 16 separates the pump chamber 18 from a pulse chamber 17.
  • the pulse chamber 17 is connected to the crankcase interior 8 via a pulse line 21.
  • the fluctuating pressure in the crankcase interior 8 that occurs during operation leads to deflections of the pump diaphragm 16, which thereby sucks in the fuel via the inlet valve 19 and conveys it out of the pump chamber 18 via the outlet valve 20.
  • a regulating valve 22 is arranged downstream of the fuel pump 15 in a flow direction 60 of the fuel from the fuel tank 27 to the intake duct section 10.
  • the control valve 22 is coupled to a control membrane 24 and is opened or closed depending on the position of the control membrane 24.
  • the control membrane 24 separates a fuel chamber 23, which forms the control chamber of the carburetor 9, from a compensation chamber 25.
  • the compensation chamber 25 is air-filled and can be closed or connected to the environment or the clean room of an air filter, through which combustion air is sucked into the intake duct 40 be. If the pressure in the fuel chamber 23 falls, the control valve 22 opens and fuel delivered by the fuel pump 15 continues to flow into the fuel chamber 23.
  • the fuel chamber 23 feeds the main fuel opening 12 and the secondary fuel openings 14.
  • a fuel line 42 leads from the fuel chamber 23.
  • the fuel line 42 connects the fuel chamber 23 to an enrichment chamber 30 of the enrichment device 29.
  • a check valve 43 is arranged in the flow path from the fuel chamber 23 to the enrichment chamber 30.
  • the check valve 43 opens in the flow direction 60 and closes in the opposite direction.
  • the direction of flow 60 is directed from the fuel chamber 23 to the enrichment chamber 30.
  • the enrichment chamber 30 has a variable volume. In the exemplary embodiment, the enrichment chamber 30 is delimited by an enrichment pump membrane 31 for this purpose.
  • the enrichment chamber 30 can alternatively also change the volume in a different form, for example by means of an adjustment of a side wall delimiting the enrichment chamber 30.
  • the enrichment chamber 30 is connected to a channel 38 via a connecting line 36.
  • the connecting line 36 is also advantageously a fuel line.
  • the channel 38 connects the intake channel 40 to the crankcase interior 8.
  • the channel 38 branches off from the intake channel 40 downstream of the throttle valve 13, based on the flow direction from the carburetor 9 to the crankcase interior 8. This can prevent the channel 38 from influencing the amount of air that is supplied to the internal combustion engine 1 when idling becomes.
  • the throttle valve 13 is in particular largely or completely closed, and the free flow cross-section results from an opening in the throttle valve 13.
  • a check valve 39 is arranged in the channel 38 in the flow direction from the intake channel 40 to the crankcase interior 8 upstream of the junction between the connecting line 36 and the channel 38.
  • the check valve 39 opens in the direction of flow from the intake duct 40 to the crankcase interior 8.
  • the channel 38 can advantageously be connected to the crankcase interior 8 via a switching valve 41.
  • the switching valve 41 is arranged in the flow path from the enrichment chamber 30 to the crankcase interior 8.
  • the switching valve 41 is arranged directly on the crankcase 4.
  • the switching valve 41 is advantageously a temperature-actuated valve which closes when a structurally predetermined temperature is exceeded. As a result, fuel is fed into the crankcase interior 8 via the channel 38 only at low temperatures. Another, for example electrical, actuation of the switching valve 41 can, however, also be advantageous.
  • the enrichment chamber 30 can be connected via an in Fig. 1 Connecting line 66 shown in dashed lines may be connected to intake duct 40.
  • a check valve 67 is advantageously arranged in the connecting line 66.
  • the fuel system 29 advantageously has a connecting line 36 and / or a connecting line 66.
  • the enrichment chamber 30 is connected to a delivery chamber 34 of the delivery pump 28 via a fuel line 44.
  • a check valve 45 which opens in flow direction 60, is arranged in fuel line 44.
  • the flow direction 60 runs from the enrichment chamber 30 to the delivery chamber 34.
  • the delivery chamber 34 is advantageously partially made up of an elastic pump bellows 33 limited.
  • a fuel line 46 preferably leads from the delivery chamber 34 to the fuel tank 27.
  • a check valve 47 is arranged in the fuel line 46 and opens in the flow direction 60.
  • the direction of flow 60 runs from the delivery chamber 34 to the fuel tank 27.
  • the fuel outlet 58 is located downstream of the check valve 47 and is shown in FIG Fig. 1 is shown on a schematically shown wall of the housing 59 of the carburetor 9.
  • the carburetor 9 is accordingly connected to the fuel tank 27 at the fuel inlet 57 and at the fuel outlet 58.
  • the fuel pump 15, the enrichment device 29 and the feed pump 28 are arranged one behind the other in the flow direction 60 in the line path from the fuel inlet 57 to the fuel outlet 58. Further elements can be interposed, such as the fuel chamber 23 of the carburetor 9.
  • the fuel chamber 23 of the carburetor 9 is arranged in the flow direction 60 between the fuel pump 15 and the enrichment device 29.
  • the pump bellows 33 which delimits the delivery chamber 34, is provided to be actuated by an operator in the direction of the arrow 54.
  • the pump bellows 33 is advantageously connected to an enrichment pump membrane 31 via a coupling element 35.
  • the coupling element 35 is a rigid, mechanical coupling element, for example a coupling rod made of metal or dimensionally stable plastic.
  • the fuel is advantageously conveyed via the channel 38 and / or the intake channel 40 and / or directly into the crankcase interior 8.
  • a connecting line 68 is shown schematically, via which fuel can be conveyed from the enrichment chamber 30 directly into the crankcase interior 8.
  • a check valve 69 is advantageously arranged in the connecting line 68.
  • a free travel can also be provided in the coupling of the pump bellows 33 and the enrichment pump membrane 31. As a result, the distance by which the pump bellows 33 is deflected is greater than the distance by which the enrichment pump membrane 31 is deflected by the structurally predetermined idle distance.
  • the feed pump 28 and the enrichment pump membrane 31 are coupled to one another so that a complete actuation of the feed pump 28 from the non-actuated state to the maximally actuated state leads to a reduction in the volume of the enrichment chamber 30 by a structurally predetermined volume.
  • a spring 32 is arranged in the enrichment chamber 30, which acts as a return spring and, as soon as the operator lets go of the pump bellows 33, returns the enrichment pump membrane 31 to its starting position.
  • the enrichment chamber 30 is connected to the crankcase interior 8.
  • the connecting line 36 can advantageously be provided in the flow path from the enrichment chamber 30 into the crankcase interior 8.
  • the connecting line 36 is a line in which advantageously only fuel flows.
  • the connecting line 36 opens into the channel 38, which transports the fuel from the connecting line 36 into the crankcase interior 8.
  • the channel 38 is designed as a gas-carrying, namely as an air-carrying or mixture-carrying channel. During operation, air is sucked into the crankcase interior 8 through the gas-carrying duct 38 when there is a negative pressure in the crankcase interior 8. In the exemplary embodiment, the air is drawn in from the intake duct 40 into the crankcase interior 8.
  • the intake duct 40 also opens into the crankcase interior 8, in particular via a valve (not shown).
  • the intake channel 40 on the cylinder 2 preferably opens into an area over which the piston 5 passes.
  • the valve which connects the intake duct 40 to the crankcase interior 8 is preferably formed by the piston 5.
  • the piston 5 opens and closes an inlet opening of the intake duct 40 on the cylinder 2 as it moves back and forth.
  • the internal combustion engine 1 is preferably an internal combustion engine that is slot-controlled by the piston 5.
  • the operator Before starting the internal combustion engine 1, the operator usually actuates the feed pump 28.
  • the feed pump 28 is advantageously actuated by pressing the pump bellows 33 several times in the direction of arrow 54. This causes fuel to be drawn from the fuel tank 27 via the fuel line 52, the pump chamber 18 of the fuel pump 15, the fuel chamber 23, the enrichment device 29 and the delivery chamber 34 are conveyed into the fuel tank 27 and the entire fuel system 26 is thereby flushed.
  • the pump bellows 33 is moved, the enrichment pump diaphragm 31 is simultaneously actuated via the coupling element 35 and fuel is thus conveyed from the enrichment chamber 30 into the connecting line 36 and via the channel 38 into the crankcase interior 8.
  • the check valves 37, 39, 43, 45 and 47 ensure that the fuel flows in the desired direction.
  • Fig. 2 shows an alternative embodiment.
  • the same reference symbols identify elements that correspond to one another in all figures.
  • the embodiment according to Fig. 2 corresponds essentially to the embodiment according to Fig. 1 , referring to the description for elements that are shown in both exemplary embodiments Fig. 1 is referred.
  • the enrichment device 29 is arranged in the flow path from the fuel tank 27 to the fuel pump 15.
  • the enrichment chamber 30 is accordingly located upstream of the fuel pump 15 and the fuel chamber 23.
  • the enrichment device 29, the fuel pump 15 and the feed pump 28 are arranged one behind the other in the line path from the fuel inlet 57 to the fuel outlet 58 in the flow direction 60.
  • the fuel chamber 23 of the carburetor 9 is arranged in the flow direction 60 between the fuel pump 15 and the feed pump 28.
  • the enrichment device 29 and the feed pump 28 are advantageously arranged in the housing 59 of the gasifier 9.
  • the enrichment chamber 30 is connected to the fuel tank 27 via a fuel line 48.
  • the non-return valve 37 is advantageously biased towards the closed position by a spring (not shown).
  • a check valve 49 which opens in flow direction 60, is arranged in fuel line 48. The direction of flow 60 runs from the fuel tank 27 to the enrichment chamber 30.
  • the fuel inlet 57 of the carburetor 9, shown schematically, is located between the check valve 49 and the fuel tank 27.
  • the enrichment chamber 30 is advantageously located in the direction of flow 60 behind the fuel inlet 57 of the carburettor 9
  • a fuel line 56 leads to the fuel pump 15 of the carburetor 9.
  • the fuel chamber 23 is connected to the delivery chamber 34 of the delivery pump 28 via a fuel line 50.
  • a check valve 51 which opens in flow direction 60, is arranged in fuel line 50. The flow direction 60 runs from the fuel chamber 23 to the delivery chamber 34.
  • the fuel line 56 is partially shown with a dashed line.
  • the check valve 47 is arranged upstream of the fuel outlet 58 of the carburetor 9 in relation to the flow direction 60.
  • the feed pump 28 is coupled to the enrichment chamber 30 via a hydraulic coupling 55. If the volume of the delivery chamber 34 decreases, the volume of the enrichment chamber 30 is reduced due to the hydraulic coupling 55.
  • the volume of the enrichment chamber 30 can be reduced by deflecting the enrichment pump membrane 31.
  • the path by which the enrichment pump diaphragm 31 is deflected from the non-actuated state to the fully actuated state when the pump bellows 33 is fully actuated is structurally predetermined, for example by means of corresponding stops.
  • Fig. 3 shows a further preferred embodiment.
  • the enrichment device 29 is arranged in the flow path from the fuel chamber 23 to the delivery chamber 34. This corresponds to the arrangement Fig. 1 , to the description of which reference is made.
  • the feed pump 28 is coupled to the enrichment device 29, preferably to the enrichment pump membrane 31, via an electrical coupling 65.
  • the coupling 65 is preferably designed such that actuation of the pump bellows 33 causes the volume of the enrichment chamber 30 to be reduced by a predetermined value.
  • the enrichment chamber 30 is connected to the crankcase interior 8 via a fuel line 53.
  • the fuel line 53 only carries fuel and no air during operation.
  • the fuel line 53 opens into the crankcase interior 8.
  • the fuel is not fed into a gas-carrying channel, but directly into the crankcase interior 8.
  • the switching valve 41 is arranged at the opening of the fuel line 53 into the crankcase interior 8.
  • the switching valve 41 is arranged directly on the crankcase 4.
  • the type of coupling of the feed pump 28 and the enrichment device 29 can take place mechanically, in particular via a rigid coupling element 35, hydraulically via a hydraulic coupling 55 or electrically via an electrical coupling 65 for each exemplary embodiment.
  • Other types of coupling can also be advantageous.
  • the fuel is supplied from the enrichment chamber 30 into the crankcase interior 8.
  • provision can be made for the fuel to be supplied from the enrichment chamber 30 via the intake duct 40 into the crankcase interior 8.
  • a fuel delivery is conceivable when actuated by means of mechanical coupling in the intake channel 40, as in FIG Fig. 1 shown schematically.

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  • 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)

Claims (15)

  1. Carburateur pour l'amenée de mélange carburant/air jusqu'à un moteur à combustion interne (1), avec une pompe à carburant (15), une pompe de refoulement (28) à actionner par un utilisateur, et un dispositif d'enrichissement (29), dans lequel le carburateur (9) comporte au moins une chambre de carburant (23) dans laquelle la pompe de refoulement (28) refoule du carburant (15), dans lequel depuis la au moins une chambre de carburant (23) du carburant est amené en fonctionnement dans une section de canal d'aspiration (10) formée dans le carburateur (9), dans lequel la pompe de refoulement (28) est formée pour refouler du carburant hors de la au moins une chambre de carburant (23), dans lequel le dispositif d'enrichissement (29) comporte une chambre d'enrichissement (30), et dans lequel le dispositif d'enrichissement (29) est formé pour amener du carburant de la chambre d'enrichissement (30) jusqu'au moteur à combustion interne (1),
    caractérisé en ce que la chambre d'enrichissement (30) présente un volume variable, et en ce que la pompe de refoulement (28) et le dispositif d'enrichissement (29) sont couplés de telle sorte qu'un actionnement complet de la pompe de refoulement (28) depuis l'état non actionné de la pompe de refoulement (28) entraîne une réduction du volume de la chambre d'enrichissement (30) suivant un volume prédéfini par la construction.
  2. Carburateur selon la revendication 1,
    caractérisé en ce que la chambre d'enrichissement (30) est limitée par un élément mobile, en ce que la pompe de refoulement (28) comprend un soufflet de pompe (33), et en ce que le mouvement de l'élément mobile est couplé par un élément de couplage (35) au mouvement du soufflet de pompe (33).
  3. Carburateur selon la revendication 1 ou 2,
    caractérisé en ce que la pompe de refoulement (28) et le dispositif d'enrichissement (29) sont couplés hydrauliquement ou électriquement de telle sorte qu'un actionnement de la pompe de refoulement (28) entraîne une variation du volume de la chambre d'enrichissement (30).
  4. Carburateur selon l'une des revendications 1 à 3,
    caractérisé en ce que la chambre d'enrichissement (30) est montée avant la pompe de refoulement (28).
  5. Carburateur selon la revendication 4,
    caractérisé en ce que dans la liaison d'écoulement de la chambre d'enrichissement (30) à la pompe de refoulement (28) est disposé un premier clapet antiretour (45).
  6. Carburateur selon la revendication 5,
    caractérisé en ce que le dispositif d'enrichissement (29) refoule le carburant pour le moteur à combustion interne (1) depuis la chambre d'enrichissement (30) dans une conduite de liaison (36), dans lequel la conduite de liaison (36) est prévue pour la liaison à un carter de vilebrequin (8) d'un moteur à combustion interne (1).
  7. Carburateur selon la revendication 6,
    caractérisé en ce que dans la conduite de liaison (36) est disposé un deuxième clapet antiretour (37).
  8. Carburateur selon la revendication 7,
    caractérisé en ce que la pression d'ouverture du deuxième clapet antiretour (37) est inférieure à la pression d'ouverture du premier clapet antiretour (45).
  9. Carburateur selon l'une des revendications 1 à 8,
    caractérisé en ce que la pompe de refoulement (28) est disposée dans la trajectoire de conduite derrière la chambre de carburant (23) par rapport au sens d'écoulement (60).
  10. Carburateur selon l'une des revendications 1 à 9,
    caractérisé en ce que la chambre d'enrichissement (30) est disposée dans la trajectoire de conduite derrière la chambre de carburant (23) par rapport au sens d'écoulement (60).
  11. Carburateur selon l'une des revendications 1 à 9,
    caractérisé en ce que la chambre d'enrichissement (30) est disposée dans la trajectoire de conduite devant la chambre de carburant (23) par rapport au sens d'écoulement (60).
  12. Moteur à combustion interne avec un carburateur (9) selon l'une des revendications 1 à 11,
    caractérisé en ce que la chambre d'enrichissement (30) est en liaison d'écoulement avec un espace intérieur de carter de vilebrequin (8) du moteur à combustion interne (1).
  13. Moteur à combustion interne selon la revendication 12,
    caractérisé en ce que dans la trajectoire d'écoulement de la chambre d'enrichissement (30) à l'espace intérieur de carter de vilebrequin (8) est disposée une vanne de commutation (41).
  14. Moteur à combustion interne selon la revendication 13,
    caractérisé en ce que la vanne de commutation (41) est actionnée par température et est disposée en particulier directement sur le carter de vilebrequin (4).
  15. Moteur à combustion interne selon l'une des revendications 1 à 14, caractérisé en ce que la chambre d'enrichissement (30) est en liaison d'écoulement avec un canal d'aspiration (40) du moteur à combustion interne (1).
EP18400011.5A 2018-04-24 2018-04-24 Carburateur et moteur à combustion interne doté d'un carburateur Active EP3561280B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18400011.5A EP3561280B1 (fr) 2018-04-24 2018-04-24 Carburateur et moteur à combustion interne doté d'un carburateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18400011.5A EP3561280B1 (fr) 2018-04-24 2018-04-24 Carburateur et moteur à combustion interne doté d'un carburateur

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Publication Number Publication Date
EP3561280A1 EP3561280A1 (fr) 2019-10-30
EP3561280B1 true EP3561280B1 (fr) 2021-01-06

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Application Number Title Priority Date Filing Date
EP18400011.5A Active EP3561280B1 (fr) 2018-04-24 2018-04-24 Carburateur et moteur à combustion interne doté d'un carburateur

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112377334B (zh) * 2020-10-29 2022-04-15 浙江瑞星化油器制造有限公司 纯汽油发动机组件

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4735751A (en) * 1986-05-27 1988-04-05 Tecumseh Products Company Primer system and method for priming an internal combustion engine
JPS6466455A (en) * 1987-09-07 1989-03-13 Walbro Far East Fuel supply starting device for internal combustion engine for hand carrying working machine
EP0786591A3 (fr) * 1996-01-29 1997-08-13 WCI OUTDOOR PRODUCTS, Inc. Système d'alimentation de carburant de démarrage rapide pour moteur à combustion interne
US5711901A (en) * 1996-06-05 1998-01-27 Walbro Corporation Carburetor having temperature-compensated purge/primer
DE19941697A1 (de) * 1999-09-02 2001-03-08 Stihl Maschf Andreas Membranvergaser
JP2003254162A (ja) 2002-02-26 2003-09-10 Zama Japan Kk 気化器の始動燃料供給装置
US7210441B1 (en) 2005-04-14 2007-05-01 Walbro Engine Management, L.L.C. Priming and purging system and method for an internal combustion engine
US7690342B2 (en) * 2007-01-05 2010-04-06 Walbro Engine Management, L.L.C. Priming circuit for a fuel system

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