EP3584435B1 - Vergaser und handgeführtes arbeitsgerät mit einem verbrennungsmotor mit einem vergaser - Google Patents

Vergaser und handgeführtes arbeitsgerät mit einem verbrennungsmotor mit einem vergaser Download PDF

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Publication number
EP3584435B1
EP3584435B1 EP19177807.5A EP19177807A EP3584435B1 EP 3584435 B1 EP3584435 B1 EP 3584435B1 EP 19177807 A EP19177807 A EP 19177807A EP 3584435 B1 EP3584435 B1 EP 3584435B1
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EP
European Patent Office
Prior art keywords
pump
chamber
fuel
carburettor
connection
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
EP19177807.5A
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German (de)
English (en)
French (fr)
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EP3584435A1 (de
Inventor
Christian Schlecker
Malte Hartmann
Michael Grether
Wolfgang Kienzle
Daisuke Suzuki
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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Publication of EP3584435A1 publication Critical patent/EP3584435A1/de
Application granted granted Critical
Publication of EP3584435B1 publication Critical patent/EP3584435B1/de
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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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
    • 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
    • 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
    • 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
    • F02M19/06—Other details of fuel conduits
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel

Definitions

  • the invention relates to a carburetor of the type specified in the preamble of claim 1 and a hand-held tool with an internal combustion engine with a carburetor.
  • a carburetor which is designed as a membrane carburetor.
  • the carburetor has a control chamber through which fuel is fed into the intake duct.
  • the carburetor also has a fuel pump that is integrated in the carburetor housing.
  • the fuel inlet and the fuel outlet are formed on a common cover.
  • the DE 101 42 247 A1 Fig. 10 shows a carburetor in which a fuel inlet and a fuel outlet are formed on a pump cover of the fuel pump.
  • a ventilation opening for the compensation chamber of the pressure regulator is arranged on a pump plate, which is arranged between the carburetor body and the pump cover.
  • the WO 2011/074404 A1 and the EP 1 162 361 A2 show carburetors whose fuel pump is limited by the carburetor body and an intermediate part.
  • the fuel inlet and fuel outlet are formed on the intermediate part.
  • the pressure regulator is limited by the intermediate part and an end plate.
  • the U.S. 5,891,369 A shows a carburetor with a fuel pump, a pressure regulator, a manually operated enrichment pump and a manually operated purger pump.
  • the fuel pump connected to the fuel inlet and the pressure regulator are arranged on opposite sides of the intake duct.
  • the invention is based on the object of creating a carburetor of the generic type which has a simple structure. Another object of the invention is to provide a hand-held power tool with an internal combustion engine and a carburetor which has a simple structure.
  • this object is achieved by a carburetor having the features of claim 1.
  • the object is achieved by a hand-held tool with the features of claim 13.
  • an intermediate part is arranged between the pump cover, which at least partially delimits the fuel pump, and the carburetor body, in which the intake duct section is formed, and that the fuel inlet, the fuel outlet and the compensation connection are formed on the intermediate part.
  • the fact that the fuel inlet, fuel outlet and compensation connection are formed on the same component, namely the intermediate part, means that the individual components of the carburetor can be easily manufactured, and advantageous ducts with a compact design result.
  • the fuel inlet can be directed with a short line path to the fuel pump, i.e. in the direction of the pump cover, while the fuel outlet and the compensation connection are connected to the control chamber and the compensation chamber. This results in a simple duct layout with short cable routes.
  • the fuel inlet and the compensation connection point in the same direction.
  • the fuel inlet, fuel outlet and compensation connection have in the same direction.
  • the fuel inlet, the fuel outlet and the compensation connection each designate the opening for fuel or air, which is formed, for example, on a corresponding connection piece, but not the connection piece itself.
  • the fuel outlet and / or the compensation connection can also be designed as openings on the intermediate part.
  • the fuel inlet, fuel outlet and compensation connection are formed on connecting pieces. At least the connection pieces of the fuel inlet and the compensation connection, particularly preferably all the connection pieces, are advantageously arranged on the same side of the carburetor housing.
  • one or more connecting pieces are angled and the connecting piece on one side of the carburetor housing protrudes away from the carburetor housing in a first direction and the respective opening, i.e. fuel inlet, fuel outlet or compensation connection, protrudes in one direction to this angled second direction is aligned.
  • the fuel inlet and compensation connection and in particular also the fuel outlet point in the same direction the connections on the fuel inlet and compensation connection and possibly also on the fuel outlet can be mounted in the same direction.
  • installation space for the assembly of the connections only has to be provided on one side of the carburetor housing. The result is a compact design and the assembly of the connections on the carburetor housing is simplified.
  • the carburetor housing advantageously has an upstream side and a downstream side in relation to the direction of flow in the intake duct section.
  • the connecting pieces of the fuel inlet and the compensation connection are arranged in particular on the upstream side of the carburetor housing.
  • the connecting piece of the fuel outlet is preferably also arranged on the upstream side of the carburetor housing. Another position of the connection piece of the fuel outlet, in particular a position on a side running parallel to the direction of flow in the intake channel, can also be advantageous.
  • the fuel inlet and the compensation connection are advantageously both formed on connecting pieces which are integrally formed on the intermediate part.
  • the fuel outlet is also formed on a connection piece which is integrally formed on the intermediate part.
  • the fuel inlet, the compensation connection and the fuel outlet are each formed on connecting pieces formed in one piece on the intermediate component. This results in a simple structure and simplified assembly.
  • one or more connecting pieces are formed on tubular nozzles which are not made of the same material as the base body of the intermediate part.
  • the at least one connection piece can in particular consist of metal.
  • the intermediate part is an injection-molded part and the connecting piece made of metal is encapsulated by the intermediate part.
  • the compensation connection is advantageously formed on a connection piece for connection to the clean room of an air filter.
  • the connection piece of the compensation connection is advantageously to be connected directly to an air filter base of the air filter.
  • the pressure regulator is limited by the carburetor body and the intermediate part.
  • the fuel pump is delimited by the intermediate part and the pump cover.
  • the pressure regulator and the fuel pump are arranged in particular on the opposite sides of the intermediate part. This means that the pressure regulator and fuel pump can be constructed with just a few components.
  • the arrangement of the pressure regulator, which is arranged downstream of the fuel pump, between the carburetor body and the intermediate part results in a short line path from the pressure regulator, in particular the control chamber of the pressure regulator, into the intake duct section.
  • At least one buffer chamber is advantageously arranged in the flow path between the fuel inlet and the fuel outlet. At least one buffer chamber is preferably arranged in the flow path between the fuel pump and the control chamber. The at least one buffer chamber is advantageously at least partially delimited by the pump membrane. An additional membrane to delimit the buffer chamber is not required, resulting in a simple, compact design.
  • the pump chamber and the at least one buffer chamber are arranged on opposite sides of the pump membrane. However, it can also be advantageous to arrange at least one buffer chamber and the pump chamber on the same side of the pump membrane.
  • a first buffer chamber is arranged in the flow path between the fuel pump and the control chamber, and a second buffer chamber is provided downstream of the control chamber.
  • a first buffer chamber is arranged upstream of the pump chamber and a second buffer chamber is arranged downstream of the pump chamber.
  • the area of the second buffer chamber is particularly advantageously larger than the area of the first buffer chamber on the membrane delimiting the buffer chambers.
  • the first buffer chamber advantageously has an area measured on the delimiting membrane which is approximately 50% to 70% of the area of the area of the pump chamber measured on the pump membrane.
  • the second buffer chamber advantageously has an area measured on the delimiting membrane which is approximately 20% to 30% of the area of the pump chamber measured on the pump membrane.
  • the pump membrane advantageously separates the at least one buffer chamber from a rear space. In a preferred embodiment, the rear space of at least one buffer chamber is delimited by the pump cover.
  • the rear space of at least one buffer chamber is delimited by the intermediate part.
  • the at least one buffer chamber is at least partially delimited by the intermediate part.
  • the pump chamber and a first and a second buffer chamber are delimited by the intermediate part and the pump membrane.
  • the area of the membrane section of the pump membrane that delimits the at least one buffer chamber is advantageously comparatively large.
  • the area of the diaphragm section of the pump diaphragm which delimits the at least one buffer chamber is at least 25% of the area of the diaphragm section of the pump diaphragm which delimits the pump chamber.
  • the area of the membrane section of each buffer chamber is at least 25% of the area of the membrane section of the pump membrane which delimits the pump chamber.
  • the pump membrane separates the pump chamber from a pulse chamber.
  • the impulse chamber is advantageously connected to an impulse connection via an impulse line.
  • the impulse conduit is preferably at least in part of the intermediate part limited. A simple structure is achieved through the at least partial formation of the impulse line in the intermediate part. In a particularly preferred embodiment, the impulse line is formed completely in the intermediate part.
  • the impulse line advantageously runs from the intermediate part to the carburetor body and opens on the downstream side of the carburetor body on the outside of the carburetor.
  • a connection to a connection flange is advantageously formed, via which the carburetor is mounted on the internal combustion engine.
  • the fuel inlet and the compensation connection are arranged on the side of the carburetor facing away from the internal combustion engine. This enables a simple connection of fuel lines and a simple production of the connection of the compensation connection to the air filter.
  • the side of the carburetor facing away from the internal combustion engine is easily accessible during assembly. The assembly only needs to be done in one direction.
  • the fuel outlet is also arranged on the side of the carburetor facing away from the internal combustion engine.
  • the combustion engine draws in the combustion air advantageously through an air filter.
  • the air filter preferably has a connection piece plugged onto the compensation connection, which connects the compensation connection to a clean room of the air filter.
  • the connection to the clean room of the air filter is made integrally on the air filter between the air filter and the carburetor. This results in a simple structure and simple assembly. Assembly errors when connecting the compensation connection to the clean room of the air filter are avoided.
  • Fig. 1 shows a two-stroke engine as an exemplary embodiment for an internal combustion engine 1.
  • the internal combustion engine 1 can, however, also be a four-stroke engine, in particular 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 mounted to and fro in the cylinder 2.
  • the piston 5 drives a crankshaft 8 rotatably mounted in a crankcase interior 38 of a crankcase 4 via a connecting rod 6.
  • the crankshaft 8 is mounted rotatably about an axis of rotation 7.
  • Fig. 1 shows the arrangement with the piston 5 near its bottom dead center. In the area of the bottom dead center of the piston 5, the crankcase interior 38 is fluidically connected to the combustion chamber 3 via overflow ducts 12.
  • the overflow channels 12 open into the combustion chamber 3 with overflow windows 13.
  • An outlet 46 for exhaust gases leads from the combustion chamber 3.
  • the internal combustion engine 1 draws in combustion air via an air filter 22 and a carburetor 15 in a flow direction 21 through an intake duct.
  • the intake duct is separated into a mixture duct 9 and an air duct 10 by a partition 11.
  • the mixture channel 9 opens into the crankcase interior 38 with a mixture inlet 20 controlled by the piston 5.
  • the air channel 10 opens with at least one air inlet 19 in an area that is swept by a piston pocket 14 on the cylinder bore.
  • the piston pocket 14 connects the air inlet 19 in the area of the top dead center of the piston 5 with the overflow windows 13. This means that low-fuel or largely fuel-free air can be stored upstream from the air duct 10 in the overflow ducts 12.
  • the internal combustion engine 1 accordingly works with a flushing reservoir.
  • the carburetor 15 is connected to the cylinder 2 of the internal combustion engine 1 via an intermediate flange 18.
  • the carburetor 15 has a carburetor housing 17 in which an intake duct section 16 is formed.
  • the intake duct section 16 in the carburetor 15 is already separated into the air duct 10 and the mixture duct 9.
  • At least one throttle element in the exemplary embodiment a throttle valve 24, is arranged in the intake duct section 16.
  • the throttle valve 24 is pivotably supported by a throttle shaft 25.
  • fuel openings 27 open into the intake channel section 16.
  • a venturi 23 is formed upstream of the throttle valve 24, in the area of which a fuel opening 28 opens into the mixture channel 9.
  • the air filter 22 has filter material 26 which separates a clean room 87 from the environment.
  • the intake channel section 16 is connected to the clean room 87.
  • Fig. 2 shows schematically the structure of the fuel system of the internal combustion engine 1.
  • the internal combustion engine 1 has a fuel tank 29, from which fuel to the fuel openings 27 and 28 of the carburetor 15 ( Fig. 1 ) is supplied.
  • a suction head 31 is provided which protrudes into the fuel tank 29.
  • the internal combustion engine 1 has a fuel pump 30 which is connected to the suction head 31 via a fuel line 33.
  • the fuel pump 30 includes an inlet valve 34, one of one
  • the pump membrane 32 delimits the pump chamber 36 and an outlet valve 35.
  • the pump membrane 32 separates the pump chamber 36 from a pulse chamber 37.
  • the pulse chamber 37 is connected to the crankcase interior 38 via a pulse line 56.
  • the pump diaphragm 32 Due to the fluctuating pressure in the crankcase interior 38 during operation, the pump diaphragm 32 is deflected. In this case, fuel is alternately sucked into the pump chamber 36 via the inlet valve 34 and fuel is pressed out of the pump chamber 36 via the outlet valve 35.
  • the fuel passes through the outlet valve 35 into a fuel chamber 39.
  • a regulating valve 41 which is part of a pressure regulator 40, leads out of the fuel chamber 39.
  • the fuel is fed via the inlet valve 34 into a control chamber 43 of the pressure regulator 40, which is delimited by a control diaphragm 44.
  • the control chamber 43 is connected to the fuel orifices 27 and 28 via fuel channels (not shown).
  • the regulating diaphragm 44 is acted upon by a spring 47.
  • the inlet valve 31 has a valve body 42, the position of which is coupled to the position of the regulating diaphragm 44. If the pressure in the control chamber 43 is too low, the inlet valve 31 opens and fuel from the fuel chamber 39 flows into the control chamber 43.
  • the side of the regulating diaphragm 44 facing away from the regulating chamber 43 delimits a compensation chamber 45 which has a compensation connection 65.
  • the compensation connection 65 is connected to the clean room 87 of the air filter 22 ( Fig. 1
  • a purger 50 is arranged downstream of the control chamber 43.
  • the purger 50 comprises a pump bellows 51 which can be actuated by the operator.
  • the pump bellows 51 is connected to a return line 55 via an inlet valve 52 and an outlet valve 53.
  • the return line 55 opens into the fuel tank 29.
  • a check valve 54 is arranged in the return line 55 between the branch to the inlet valve 52 and the inlet from the outlet valve 53. That Check valve 54 prevents the pump bellows 51 from being able to suck in fuel through the inlet valve 52 from downstream of the check valve 54.
  • the purger 50 can also be omitted.
  • Fig. 3 shows the structure of the carburetor 15 in detail.
  • the carburetor 15 has a carburetor body 60 in which the intake duct section 16 is formed. In the intake duct section 16 is in Fig. 1 Choke flap 48, not shown, is pivotably mounted. The choke valve 48 is upstream of the throttle valve 24 ( Fig. 1 ) arranged.
  • a cover cap 78 for adjusting screws of the carburetor 15, in particular an idle adjusting screw and a full-load adjusting screw, is also arranged on the carburetor body 60.
  • the carburetor body 60 has an underside 82 which runs approximately parallel to the intake duct section 16.
  • a positioning pin 80 is provided on the underside 82.
  • the regulating diaphragm 44 is arranged on the underside 82 of the carburetor body 60.
  • the regulating membrane 44 has positioning openings 81 for the in Fig. 3 Positioning pin 80 shown as well as a further, not visible, positioning pin 80 on the underside 82.
  • a compensation chamber seal 61 is arranged on the side of the regulating diaphragm 44 facing away from the carburetor body 60.
  • the compensation chamber seal 61 lies between the regulating diaphragm 44 and an intermediate part 62.
  • a fuel inlet 63, a fuel outlet 64 and the compensation connection 65 are formed on the intermediate part 62.
  • the compensation chamber 45 is delimited by the intermediate part 62 and the regulating diaphragm 44 and, on its periphery, by the compensation chamber seal 61.
  • the pump diaphragm 32 which has the inlet valve 34 and the outlet valve 35, is arranged on the side of the intermediate part 62 facing away from the compensation chamber 45.
  • a pump seal 67 is arranged on the side of the pump diaphragm 32 facing away from the intermediate part 62.
  • a pump cover 68 is arranged on the side of the pump seal 67 opposite the pump membrane 32.
  • the pump cover 68 has positioning pins 92 which protrude into positioning openings 93 of the pump seal 67 and into positioning openings 94 of the pump membrane 32.
  • both the positioning pins 80 of the carburetor body 60 and the positioning pins 92 of the pump cover 68 protrude into the intermediate part 62, so that the positioning pins 80 and 92 secure all the components of the carburetor 15 in relation to one another.
  • Fig. 3 also shows, four fastening openings 79 are provided in the exemplary embodiment, which extend through the pump cover 68, the pump seal 67, the pump diaphragm 32, the intermediate part 62, the compensation chamber seal 61 and the control diaphragm 44 and via which the aforementioned components are to be fixed to the carburetor body 60 .
  • the carburetor body 60 preferably has threaded openings in alignment with the fastening openings 79, into which fastening screws can be screwed into the carburetor body 60 from the pump cover 68 through the components mentioned.
  • the fuel inlet 63, fuel outlet 64 and compensation port 65 are oriented so that they point in the same direction.
  • the fuel inlet 63, fuel outlet 64 and compensation connection 65 are each formed on connecting pieces 83, 84 and 85, which are arranged on a common side 98 of the intermediate part 62 on the intermediate part 62.
  • the connecting pieces 83, 84 and 85 are formed in one piece with the intermediate part 62. This is also in Fig. 9 shown.
  • the connecting pieces 83, 84 and 85 are formed on the intermediate part 62, that is, they are made of the same material as the intermediate part 62.
  • the intermediate part 62, together with the connecting pieces 63, 64 and 65, is preferably designed as a plastic injection-molded part. In an alternative design, however, it can also be provided that one or more connecting pieces 83, 84 and / or 85 are formed separately from the base body of the intermediate part 62, in particular as a metallic pipe socket plugged into the base body.
  • FIG. 3 also shows the pressure regulator 40 ( Fig. 2 ), which comprises the regulating diaphragm 44, is limited by the carburetor body 60 and the intermediate part 62.
  • the pump chamber 36 is formed in the pump cover 68.
  • the fuel inlet 63 is formed on a connecting piece 83 of the intermediate part 62.
  • the fuel passes through the fuel inlet 63 into a fuel channel 71 in the intermediate part 62 ( Fig. 9 ) located on top of inlet valve 34 ( Fig. 3 ) opens.
  • the fuel reaches the bottom of the pump chamber 36 via the inlet valve 34.
  • the fuel channel 71 is connected to an inlet opening 76 in the pump chamber 36 via a connection formed in the pump cover 68.
  • the fuel emerges from the pump chamber 36 via an outlet opening 77 which is connected to a connecting line 73a in the pump cover 68.
  • the connecting line 73a is led up through the pump seal 67 and the pump membrane 32 to the intermediate part 62 ( Fig. 3 ) and with a connecting line 73b in the intermediate part 62 ( Fig. 9 ) tied together.
  • the connection line 73b is connected to the connection line 73c ( Fig. 12 ) in contact, via which the fuel flows from above at outlet valve 35 ( Fig. 3 ) of the fuel pump 30 ( Fig. 2 ) opens.
  • the fuel flows down through a connecting line 74a in the pump seal 67 and the pump cover 68 ( Fig. 3 ).
  • the connecting line 74a is connected to a connecting line 74b, as in Fig. 13 is shown schematically with a dashed line.
  • the connecting line 74b leads back up to the intermediate part 62, as Fig. 3 shows.
  • the connecting line 74b opens out via a connecting line 74c ( Fig. 9 ) in a buffer chamber 57.
  • the buffer chamber 57 is in Fig. 7 shown.
  • the buffer chamber 57 is separated from the pump membrane 32 by a rear space 58.
  • the buffer chamber 57 is connected via a connecting line 75a ( Fig.
  • the connecting line 75b opens into the Figures 7 and 8
  • the control valve 41 is arranged at the inlet to the control chamber 43 ( Fig. 2 ).
  • the buffer chamber 57 together with the connecting lines 73, 74 and 75 form the fuel chamber 39 ( Fig. 2 ).
  • a fuel duct 72 ( Figures 3 and 8th ), which opens at the fuel outlet 64.
  • the buffer chamber 57 ( Fig. 7 ) educated.
  • the buffer chamber 57 and the pump chamber 36 are arranged on opposite sides of the pump membrane 32.
  • the buffer chamber 57 is like Fig. 7 shows, limited by the intermediate part 62.
  • Fig. 3 shows diagrammatically on the pump diaphragm 32 the diaphragm section 59 of the pump diaphragm 32, which delimits the buffer chamber 57, and the diaphragm section 69 of the pump diaphragm 32, which delimits the pump chamber 36.
  • the membrane section 59 is smaller than the membrane section 69.
  • the area of the membrane section 59 is advantageously at least 25%, in particular at least 30% of the area of the membrane section 69.
  • the carburetor 1 is essentially composed of the carburetor body 60, the intermediate part 62, the pump cover 68 and the seals 61 and 67 and membranes 44 and 32 in between.
  • the choke valve 48 is pivotably mounted with a choke shaft 49 in the intake duct section 16.
  • the carburetor 15 has an upstream side 90.
  • the upstream side 90 is related to the flow direction 21 ( Fig. 1 ) arranged upstream, i.e. facing the air filter 22, while the downstream side 91 ( Figures 4 and 5 ) facing the cylinder 2 of the internal combustion engine 1.
  • the fuel inlet 63, the fuel outlet 64 and the compensation port 65 are aligned parallel to the upstream side 90 of the carburetor 15.
  • the compensation connection 65 is connected to the compensation chamber 45 via a compensation channel 70.
  • a connecting line 86 leads from the control chamber 43 to the fuel openings 28. At least one further connecting line, not shown, leads to the fuel openings 27 ( Fig. 1 ).
  • Fig. 8 also shows that the choke valve 48 is arranged upstream of the throttle valve 24 in the intake duct section 16, and that a section of the partition 11 runs between the choke valve 48 and the throttle valve 24.
  • the Figures 9 and 10 show the opening of the compensation channel 70 in the control chamber 43.
  • the control chamber 43 is a recess on the in Fig. 3 upper side of the intermediate part 62 is formed.
  • a recess forming the pulse chamber 37 is formed.
  • the pulse chamber 37 is formed as a recess on the intermediate part 62 pulse line 56 with an in Fig. 4 Pulse connection 66 shown connected.
  • the pulse connection 66 is formed on the downstream side 91 of the carburetor 15.
  • the impulse line 56 extends through the intermediate part 62, the compensation chamber seal 61 and the control diaphragm 44 to the carburetor body 60.
  • the Figures 10 and 11 also show the arrangement of the connecting pieces 83, 84 and 85 on the side 98 of the intermediate part 62.
  • the side 98 is on the upstream side 90 of the carburetor 15 ( Fig. 6 ) arranged.
  • the fuel inlet 63 that is to say the opening through which fuel enters the connecting piece 83, is oriented in the direction of an arrow 95.
  • the fuel outlet 64 is formed on a connecting piece 84.
  • the fuel outlet 64 is oriented in the direction of an arrow 96 which lies parallel to the arrow 95.
  • the compensation connection 65 is formed on a connection piece 85 which is oriented in the direction of an arrow 97.
  • the arrow 97 lies parallel to the arrows 95 and 96. This allows connection lines to the fuel inlet 63, fuel outlet 64 and compensation connection 65 to be mounted in the same direction, namely parallel to the arrows 95, 96 and 97.
  • the arrows 95, 96 and 97 are the normals to the respective opening and indicate the direction in which a connection is to be mounted on the respective connection piece 83, 84 and 85.
  • a connection piece 83 ′ on which the fuel inlet 63 ′ is formed, is arranged on a second side 99 of the intermediate part 62.
  • the second side 99 lies in the assembled state of the carburetor 15 between the sides 90 and 91 of the carburetor 15.
  • the connection piece 83 ' is angled, and the fuel inlet 63' is oriented in the direction of an arrow 95 ', which lies parallel to the arrows 96 and 97.
  • the connection piece 83 ' is fixed on a further side 99 of the intermediate part 62, the fuel inlet 63', fuel outlet 64 and compensation connection 65 can be connected to connection lines in the same direction.
  • the fuel inlet 63 or 63 ′, the fuel outlet 64 and the compensation connection 65 point in the same direction and are arranged on the side 98 of the carburetor 15.
  • a fuel outlet 64 ' is formed on a connecting piece 84'.
  • the connecting piece 84 ′ is arranged on the second side 99 of the intermediate part 62.
  • the connection piece 84 ' runs transversely, in the exemplary embodiment perpendicular to the second side 99. "Transverse” here means that the connection piece 84' runs at an angle to the second side 99 that is greater than 0 ° and less than 180 °.
  • Fuel inlet 63, 63 'and compensation connection 65 point in the same direction.
  • a flexible hose 100 is connected to the connecting piece 84 ′.
  • the flexible hose 100 is bent in the direction corresponding to the arrows 95 and 97.
  • the connecting piece 84 ′ is also preferably molded onto the base body of the intermediate part 62.
  • the air filter 22 has an air filter base 89, on which a connection piece 88 for connection to the compensation connection 65 is provided.
  • the connection piece 88 overlaps the connection piece 85 of the compensation connection 65.
  • the air filter base 89 and the connection piece 88 are designed to be dimensionally stable, for example made of dimensionally stable plastic.
  • the compensation connection 65 is connected directly when the air filter 22 is installed on the carburetor 15.
  • the impulse line 56 from the impulse connection 66 on the carburetor body 60 ( Fig. 4 ) to the internal combustion engine 1.
  • the pulse connection 66 is connected directly to the intermediate flange 18 when the carburetor 15 is installed.
  • the upstream side 90 of the carburetor 15 is arranged facing away from the internal combustion engine 1. On the upstream side 90 of the carburetor 15 are the fuel inlet 63, the fuel outlet 64 and the compensation connection 65 ( Fig. 12 ) arranged.
  • Fig. 16 shows the arrangement of the internal combustion engine 1 schematically in a hand-held tool, in the exemplary embodiment a chainsaw 101.
  • the chainsaw 101 has a housing 102 on which a handle 103 and a handle 106 for guiding the chainsaw 101 during operation are fixed.
  • a throttle lever 104 and a throttle lever lock 105 are mounted on the handle 103.
  • a guide rail 107, on which a saw chain 108 is arranged around the circumference, is fixed to the housing 102.
  • the saw chain 108 forms the tool of the motor saw 101 and is driven in rotation by the internal combustion engine 1.
  • the carburetor 15 is held on the internal combustion engine 1 via the intermediate flange 18.
  • the air filter base 89 of the air filter 22 is fixed on the carburetor 15.
  • a buffer chamber 57 is provided, which is arranged on the side of the pump membrane 32 opposite the pump chamber 36.
  • the area of the membrane section of the pump membrane of each buffer chamber is preferably so large that it is at least 25% of the area of the membrane section of the pump membrane which delimits the pump chamber. It can be advantageous to arrange at least one buffer chamber on the side of the pump membrane 32 on which the pump chamber 36 is also arranged.
  • FIG. 17 the intermediate part 112 of an advantageous alternative embodiment of a gasifier 15 with two buffer chambers 117 and 118 is shown.
  • the intermediate part 112 has a fuel inlet 63 which is formed on a connection piece 83.
  • the same reference symbols denote elements that correspond to one another in all the exemplary embodiments.
  • the intermediate part 112 has a compensation connection 65 which is formed on a connection piece 85.
  • the fuel inlet 63 and the compensation connection 65 point in the same direction.
  • a fuel outlet 64 ' is formed on a connecting piece 84' on the intermediate part 112. Via the fuel inlet 63, fuel reaches a first buffer chamber 117, which is in the intermediate part 112 and from the in Fig. 17 not shown pump membrane 32 (see Fig. 3 ) is limited.
  • the fuel reaches the pump chamber 36 formed in the intermediate part 113 via a connecting line 113.
  • the pump chamber 36 is also separated from the pump diaphragm 32 ( Fig. 3 ) limited.
  • Inlet valve 34 and outlet valve 35 are not in the intermediate part 112, but in the pump diaphragm 32 ( Fig. 3 ) trained and therefore in Fig. 17 Not shown.
  • the second buffer chamber 118 is formed in the intermediate part 112 and is supported by the pump diaphragm 32 ( Fig. 3 ) limited.
  • the fuel arrives from the second buffer chamber 118 via an in Fig. 17 connecting line (not shown) into the control chamber 43 ( Fig. 7 ) and via the connecting line 72 ( Fig. 8 ) into the fuel outlet 64 '.
  • the further design of the carburetor according to the in Fig. 17 The embodiment shown corresponds to the embodiment described for the preceding figures, the arrangement of the connecting lines being suitably adapted.

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)
  • Fuel-Injection Apparatus (AREA)
  • Means For Warming Up And Starting Carburetors (AREA)
EP19177807.5A 2018-06-19 2019-06-03 Vergaser und handgeführtes arbeitsgerät mit einem verbrennungsmotor mit einem vergaser Active EP3584435B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018004881.1A DE102018004881A1 (de) 2018-06-19 2018-06-19 Vergaser und handgeführtes Arbeitsgerät mit einem Verbrennungsmotor mit einem Vergaser

Publications (2)

Publication Number Publication Date
EP3584435A1 EP3584435A1 (de) 2019-12-25
EP3584435B1 true EP3584435B1 (de) 2021-11-10

Family

ID=66690200

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Application Number Title Priority Date Filing Date
EP19177807.5A Active EP3584435B1 (de) 2018-06-19 2019-06-03 Vergaser und handgeführtes arbeitsgerät mit einem verbrennungsmotor mit einem vergaser

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US (1) US10801444B2 (zh)
EP (1) EP3584435B1 (zh)
CN (1) CN110617161B (zh)
DE (1) DE102018004881A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023175266A (ja) * 2022-05-30 2023-12-12 株式会社丸山製作所 燃料加圧装置

Citations (1)

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Publication number Priority date Publication date Assignee Title
US5891369A (en) * 1996-01-29 1999-04-06 White Consolidated Industries, Inc. Method and apparatus for fast start fuel system for an internal combustion engine

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US3441010A (en) 1966-12-19 1969-04-29 Mcculloch Corp Apparatus for controlling the flow of fuel to an engine
DE1941901A1 (de) 1968-08-19 1970-02-26 Keihin Seiki Mfg Vergaser
DE6801826U (de) 1968-10-10 1969-03-13 Mcculloch Corp Vergaser-vorrichtung zum regeln der brennstoffzufuhr bei brennkraftmaschinen
GB1410374A (en) 1972-10-25 1975-10-15 Walbro Corp Carburettors
DE2255593C3 (de) 1972-11-13 1978-10-19 Walbro Corp., Cass City, Mich. (V.St.A.) Membranvergaser für Brennkraftmaschinen
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US4168288A (en) 1978-06-29 1979-09-18 Briggs & Stratton Corporation Combined carburetor and impulse fuel pump
JPH03115765A (ja) 1989-09-28 1991-05-16 Maruyama Mfg Co Ltd 気化器
JPH0814107A (ja) 1994-06-27 1996-01-16 Nippon Walbro:Kk 気化器の始動燃料供給装置
JP2000027706A (ja) * 1998-07-09 2000-01-25 Nippon Walbro:Kk 膜型気化器の加速装置
JP2000297702A (ja) 1999-04-13 2000-10-24 Nippon Walbro:Kk 膜型気化器の燃料蒸気排出構造
US6394424B2 (en) 2000-06-06 2002-05-28 Walbro Corporation Carburetor with diaphragm type fuel pump
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Also Published As

Publication number Publication date
CN110617161B (zh) 2022-10-04
EP3584435A1 (de) 2019-12-25
CN110617161A (zh) 2019-12-27
US20190383235A1 (en) 2019-12-19
US10801444B2 (en) 2020-10-13
DE102018004881A1 (de) 2019-12-19

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