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EP2607642A1 - Appareil de travail - Google Patents

Appareil de travail Download PDF

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Publication number
EP2607642A1
EP2607642A1 EP12008128.6A EP12008128A EP2607642A1 EP 2607642 A1 EP2607642 A1 EP 2607642A1 EP 12008128 A EP12008128 A EP 12008128A EP 2607642 A1 EP2607642 A1 EP 2607642A1
Authority
EP
European Patent Office
Prior art keywords
crankcase
injection valve
internal combustion
combustion engine
housing part
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.)
Granted
Application number
EP12008128.6A
Other languages
German (de)
English (en)
Other versions
EP2607642B1 (fr
Inventor
Martin Rieber
Thorsten Schäffer
Jens Riehmann
Arno Kinnen
Volker Donner
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Priority to EP15003314.0A priority Critical patent/EP3009665B1/fr
Publication of EP2607642A1 publication Critical patent/EP2607642A1/fr
Application granted granted Critical
Publication of EP2607642B1 publication Critical patent/EP2607642B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P1/00—Air cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P1/00—Air cooling
    • F01P1/06—Arrangements for cooling other engine or machine parts
    • F01P1/10—Arrangements for cooling other engine or machine parts for cooling fuel injectors or sparking-plugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock
    • 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/10—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel peculiar to scavenged two-stroke engines, e.g. injecting into crankcase-pump chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/48—Engine room temperature
    • 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
    • F02M35/1017—Small engines, e.g. for handheld tools, or model engines; Single cylinder engines

Definitions

  • the invention relates to a working device of the type specified in the preamble of claim 1.
  • a hand-held implement namely a power cutter known, which is designed as a two-stroke engine internal combustion engine via an injection valve fuel is fed into an overflow channel.
  • the crankshaft of the internal combustion engine drives a fan wheel, which is arranged in a fan housing whose rear wall limits the crankcase of the internal combustion engine.
  • the DE 196 54 290 A1 shows a grass trimmer, wherein the injection valve is arranged on the output side above the fan. The fuel valve is thereby cooled as well as the engine block of the intake air.
  • the invention has for its object to provide a working device of the generic type, in which a simple way of good cooling of the injector is achieved.
  • connection opening in the fan housing is provided, via which the fan wheel conveys cooling air into the cooling area.
  • the connection opening on the suction side or the pressure side of the fan are, the cooling air can therefore be sucked over the cooling area to the fan or promoted by the fan in the cooling area.
  • the connection opening it is possible to achieve a targeted cooling of the injection valve which is separate from the cooling of the cylinder. Cool, not heated by the engine air enters the cooling area via the connection opening.
  • the cooling region in which the injection valve is arranged advantageously has a comparatively small volume, so that good and targeted cooling results.
  • the cooling area does not have to be a completely closed room.
  • the injection valve need not be directly exposed to the cooling air flowing into the cooling area, but may be indirectly cooled, for example, when the injection valve is arranged in a housing arranged in the cooling area or holder.
  • further components such as components of the fuel system, sensors or the like can be arranged in the cooling region.
  • Vapor bubbles in the fuel system may prevent fuel from being supplied to the engine since the pump power of the pump may be partially or fully compensated by the volume of gas formed. Steam bubbles in the fuel system can therefore prevent the operation of the internal combustion engine. In particular, in two-stroke engines in hand-held implements, which operate at low fuel pressure and where a lot of heat is produced in a small space, therefore, the formation of vapor bubbles is problematic.
  • connection opening is arranged in an overpressure region of the fan housing, so that cooling air is conveyed from the fan wheel into the cooling region in which the injection valve is arranged.
  • connection opening is arranged in a negative pressure region of the fan housing and the cooling air is sucked into the fan housing via the cooling region.
  • connection opening is advantageously connected via an air duct with the cooling area, so that a targeted guidance of the cooling air in the cooling area is possible. A simple structure results when the cooling area is limited by an air guide component.
  • the air duct is limited by the air guide member.
  • the air guide component is advantageously at least partially made of plastic.
  • the air guide component thereby acts thermally insulating.
  • the air guide component is advantageously arranged on the outer circumference of the crankcase.
  • the cooling region in which the injection valve is arranged is advantageously limited by the crankcase and by the air guidance component.
  • the internal combustion engine is advantageously a mixture-lubricated internal combustion engine.
  • the internal combustion engine may be a two-stroke engine or a mixture-lubricated four-stroke engine.
  • the injection valve advantageously delivers the fuel directly into the crankcase interior.
  • the mixture formation is advantageously carried out in the crankcase interior.
  • the supply of fuel directly into the crankcase interior ensures good lubrication of the parts in the crankcase.
  • the injection valve can be arranged on the crankcase, which is significantly cooler during operation than the cylinder of the internal combustion engine.
  • the injection valve can be arranged comparatively far away from the hot cylinder on the crankcase in order to keep the heat transfer to the injection valve as low as possible.
  • the injection valve is arranged in particular in a holder made of plastic, which is fastened to the crankcase and which is arranged at least partially in the cooling region. Accordingly, the injection valve is not directly flowed around by the cooling air flow conveyed by the fan wheel, but can be cooled indirectly via the holder.
  • the surface of the holder is actively cooled.
  • the lower temperature of the holder leads to a lower temperature of the injection valve or to a lower heating of the injection valve.
  • the plastic holder also reduces heat transfer from the crankcase to the injection valve. In particular, when the internal combustion engine, if no more cooling air is conveyed, thereby an excessive heating of the injector can be avoided.
  • the fuel is advantageously fed to the injection valve via a pressure damper.
  • a simple structure results when the pressure damper is integrated in the holder of the injection valve. As a result, not only the injection valve, but also the pressure damper is cooled by the cooling air flow conveyed via the connection opening.
  • the pressure damper is advantageously also arranged in the cooling area.
  • the crankcase advantageously has a first and a second housing part, between which a separating surface is formed.
  • the two housing parts are advantageously connected to each other, in particular with the interposition of a seal.
  • the separation surface lies at least partially in an imaginary parting plane.
  • the separation surface can run completely in the parting plane or, for example, at least one Stage, so that only a portion of the separation surface lies in the imaginary parting plane.
  • the parting plane is aligned so that an imaginary extension of the separating surface is perpendicular to the axis of rotation of the crankshaft.
  • the arrangement of the separation surface should be substantially perpendicular to the axis of rotation of the crankshaft. Deviations from a few degrees to the exact vertical orientation are harmless.
  • the parting plane is parallel to the cylinder longitudinal axis on the first housing part, the fan housing is arranged.
  • the first housing part and the second housing part are in particular die-cast parts, on which further components are molded.
  • the two housing parts are advantageously made of magnesium die-cast.
  • the fan housing is advantageously integrally formed on the first housing part, that is integrally formed therewith. On the first housing part and the injection valve is advantageously held.
  • the crankcase is not divided in the middle.
  • the parting plane advantageously has a distance to an imaginary center plane.
  • the median plane is the plane containing the cylinder longitudinal axis and which is perpendicular to the axis of rotation of the crankshaft.
  • the dividing plane and the median plane are two planes that are parallel to each other.
  • the axis of rotation of the crankshaft forms a straight line which intersects the median plane and the parting plane at two spaced-apart points.
  • the separation surface extends in particular on the injection valve on the side facing away from the fan housing of the imaginary plane. At the height of the injection valve, the separating surface is therefore offset to the fan housing remote from the imaginary plane.
  • the separating surface runs completely on the side facing away from the fan housing of the imaginary plane.
  • the distance is advantageously about 10% to about 50% of the measured parallel to the axis of rotation of the crankshaft width of the crankcase interior.
  • the distance is 30% to 40% of the width of the crankcase interior.
  • the first housing part is noticeably cooler than the second housing part during operation due to the cooling of the fan housing by the fan wheel.
  • the first housing part has a larger mass than the second housing part due to the unbalanced relative to the center plane arrangement of the separation surface as well as a larger surface. Due to the larger mass, the second housing part is heated more slowly than the first housing part. The larger surface causes faster heat dissipation to the environment.
  • the arrangement of the injection valve to the first, cooler housing part a lower heating of the injection valve is achieved.
  • the separating surface is advantageously offset to the second housing part at least in the region in which the receiving opening for the injection valve or the holder carrying the injection valve is arranged.
  • the distance between parting plane and center plane is advantageously given at least in the region in which the receiving opening is arranged in the projection in the direction of the axis of rotation of the crankshaft to the parting plane.
  • the dividing plane advantageously does not intersect a receiving opening for the injection valve formed on the crankcase. The fact that the parting plane is offset adjacent to the injection valve to the second housing part, there is sufficient space for the arrangement of the receiving opening and the injection valve on the first housing part available.
  • the described arrangement of the parting surface and the arrangement of the injection valve on the housing part, on which the fan is arranged, represent an independent inventive idea, which may also be advantageous regardless of the arrangement of the connection opening in the rear wall of the fan housing.
  • the temperature difference between the first and the second housing part may be on the order of about 10 K. Depending on the operating state of the internal combustion engine and the pressure in the fuel system, this temperature difference between the first and second housing parts can be decisive for reliable fuel supply via the injection valve.
  • the components to be cooled of the working device are advantageously arranged on the first housing part.
  • the injection valve is fixed to the first housing part.
  • the holder for the injection valve is advantageously in the receiving opening via a radial seal sealed.
  • the receiving opening is advantageously formed completely in the first housing part. Characterized in that the holder is radially sealed, additional fastening means such as fastening screws serve only to secure the holder on the crankcase.
  • the internal combustion engine has at least one sensor which is arranged on the outer circumference of the crankcase on the first housing part.
  • the sensor is advantageously arranged on the outside of the crankcase.
  • an arrangement on the outer circumference forming crankcase wall in the crankcase interior may also be advantageous.
  • Lower temperatures are also achieved for the sensor due to the arrangement on the first housing part.
  • the sensor may be, for example, a pressure sensor, a temperature sensor or a combined pressure-temperature sensor.
  • the arrangement of several sensors on the first housing part may be advantageous.
  • the internal combustion engine advantageously has a cylinder which is mounted on a cylinder connection flange on the crankcase.
  • the cylinder connection flange extends advantageously perpendicular to the cylinder longitudinal axis and in particular perpendicular to the separating surface between the two housing parts of the crankcase.
  • a first section of the cylinder connection flange is advantageously formed by the first housing part and a second section of the cylinder connection flange by the second housing part. Due to the design of the cylinder connection flange on both housing parts, the demolding of the housing parts in the production in a die-casting process in the direction of the axis of rotation of the crankshaft is made possible. This simplifies manufacture.
  • Fig. 1 shows an embodiment of a working device, a hand-held power grinder 1.
  • the present invention is also for other tools, especially for hand-held implements such as chainsaws, brushcutters, blowers or the like.
  • the implements may be hand carried or carried back or pushed over the ground such as lawnmowers or cutters with carriages.
  • the cut-off machine 1 has a housing 2, on which a boom 3 is fixed. At the free end of the boom 3, a cutting disc 4 is rotatably mounted, which is partially covered at its periphery by a protective cover 5.
  • a protective cover 5 For guiding the cutting grinder 1 is an upper handle 6, which is integrally formed with a hood 8 of the housing 2, and a handle tube 7, which engages over the housing 2 on the front of the housing 2 facing the blade 4.
  • a throttle lever 10 and a throttle lever 11 are pivotally mounted.
  • an air filter cover 9 is fixed to the housing 2.
  • an internal combustion engine 12 is arranged, which is to be started via a starting device.
  • the starting device can be actuated via a starter handle 15. However, it may also be provided an electric starting device.
  • a starter handle 15 In the housing 2 is also an in Fig. 1 schematically shown fuel pump 14, which serves to convey fuel to the engine 12.
  • the separation loop 1 has feet 13, with which it can be parked, for example, on the floor or on another surface.
  • Fig. 2 shows the internal combustion engine 12 in detail.
  • the internal combustion engine 12 has a cylinder 19, which is placed on a parting plane 41 on a crankcase 16.
  • a crankshaft 26 In the crankcase 16 is a crankshaft 26 with bearings 51 which are designed as ball bearings, rotatably mounted about a rotation axis 17.
  • the crankshaft 26 is mounted on both sides of a connecting rod, not shown in the figures, which serves for connection to the piston.
  • a bearing 51 is arranged in the first housing part 36 and a second bearing 51 in the second housing part 37.
  • the crankshaft 26 is driven in rotation by a cylinder 25 reciprocatingly mounted in the cylinder 19 in the direction of a cylinder longitudinal axis 29.
  • the piston 25 defines a cylinder 19 formed in the combustion chamber 24.
  • the cylinder 19 has an inner diameter b.
  • the inner diameter b is the diameter of the bore formed in the cylinder 19, in which the piston 25 is arranged.
  • a slot 22 controlled by the piston inlet 22 which is connected in the region of the top dead center of the piston 25 with the crankcase interior 18 and combustion air into the crankcase interior 18 supplies.
  • the combustion air is supplied via an intake passage 30, which via a section in a throttle body 27 is guided.
  • a throttle valve 28 is pivotally mounted in the embodiment, to which the throttle lever 10 acts. From the combustion chamber 24 leads an outlet 23, which is also slit-controlled by the piston 25.
  • a holder 33 On the outer circumference of the crankcase 16, a holder 33 is arranged, which is sealed by a radial seal 42 relative to the crankcase 16.
  • a receptacle 34 for an injection valve 43 ( Fig. 6 ) educated.
  • the injection valve 43 supplies the fuel directly into the crankcase interior 18 via an outlet channel 35 formed in the holder 33.
  • the crankcase 16 also has a mounting opening 31 for a in Fig. 2 also not shown sensor.
  • the holder 33 is disposed immediately below the inlet 22 and the throttle body 27, and the mounting hole 31 is disposed on the side facing away from the throttle body 27 of the holder 33.
  • the crankcase interior is connected to the combustion chamber 24 via one or more transfer passages 20.
  • an overflow channel 20 which divides into a plurality of branches and opens with a plurality of overflow windows 21 into the combustion chamber 24.
  • the overflow windows 21 are also controlled by the piston 25 and opened in the region of the bottom dead center of the piston 25 to the combustion chamber 24.
  • combustion air is sucked in from the intake duct 30 via the inlet 22 into the crankcase interior 18.
  • the combustion air is compressed during the downward stroke of the piston 25 in the crankcase interior 18.
  • In the crankcase interior 18 is also via the injection valve 43 ( Fig. 6 ) Supplied fuel.
  • the fuel / air mixture flows in the region of the bottom dead center of the piston 25 via the overflow passage 20 and the overflow 21 into the combustion chamber 24 a.
  • the fuel / air mixture is compressed in the combustion chamber 24 and ignited in the region of the top dead center of the piston 25 by a spark plug, not shown.
  • the piston 25 is accelerated by the combustion in the combustion chamber 24 in the direction of the bottom dead center.
  • the exhaust gases from the cylinder 19 flow into an exhaust silencer, not shown, connected to the outlet 23.
  • Fig. 2 shows, the holder 33 is disposed in a cooling region 64, which is covered by an air guide member 44 and largely separated from the environment.
  • Fig. 3 shows the air guide member 44 in detail.
  • an air duct 45 is formed, which projects to a connection spout 46.
  • the connection spout 46 is fixed in a rear wall 47 of a fan housing 32.
  • a fan 39 is arranged, which is driven by the crankshaft 26 rotating.
  • the fan 39 is advantageously rotatably connected to the crankshaft 26.
  • the crankcase 16 is bounded by a first housing part 36 and a second housing part 37, between which a parting surface 40 is formed.
  • the two housing parts 36 and 37 are located on the parting surface 40 advantageously with the interposition of a seal, in particular a paper seal to each other.
  • the separating surface 40 may be approximately part-circular, for example.
  • the parting surface 40 extends in the embodiment parallel to a in Fig. 3
  • the median plane 56 includes the cylinder longitudinal axis 29 and extends perpendicular to the axis of rotation 17 of the crankshaft 26.
  • the interface 40 may also have one or more stages.
  • the separation surface 40 is at least partially in an imaginary parting plane 68. In the exemplary embodiment, the separation surface 40 has no steps and lies completely in the parting plane 68.
  • the angle ⁇ , the imaginary parting plane 68 with the in Fig. 3 schematically drawn rotation axis 17 of the crankshaft 26 includes, is 90 °.
  • the center plane 56 corresponds to the sectional plane in Fig. 2 , As Fig. 3 shows, the separating surface 40 and thus also the parting plane 68 to the center plane 56 has a distance a.
  • the separation surface 40 and thus also the parting plane 68 has a greater distance to a crankcase 16 facing the rear wall 47 of the fan housing 32 as the center plane 56.
  • the distance a is advantageously at least about 10%, in particular at least about 15% of the inner diameter b of the cylinder 19.
  • the distance a is advantageously about 10% to about 50%, in particular 20% to 40% of the measured parallel to the rotational axis 17 of the crankshaft 26 width c of the crankcase interior 18, in Fig. 4 is shown. In the exemplary embodiment, the distance a is about 30% of the width c of the crankcase interior space 18.
  • the separating surface 40 is offset relative to the center plane 56 in the direction of a mounting flange 38 integrally formed on the second housing part 37.
  • a centrifugal clutch the cutting grinder 1, a pulley for driving the drive belt for the cutting disc 4 and a starting device for the internal combustion engine 12 may be arranged.
  • the mounting flange 38 of the boom 3 is advantageously determined.
  • the distance a is advantageously adjacent to the injection valve 43, that is to say in the projection of the receiving opening 52 (FIG. Fig. 7 ) for the holder 33 on the median plane 56 in the direction of the axis of rotation 17 of the crankshaft 26, given.
  • the parting plane 68 advantageously extends outside the receiving opening 52 on the side facing away from the fan housing 32 of the receiving opening 52.
  • the holder 33 is disposed completely on the first housing part 36, so that the injection valve 43 is held only on the first housing part 36 and has no direct contact with the second housing part 37.
  • the mounting hole 31 is completely formed on the first housing part 36.
  • the crankcase 16 facing the rear wall 47 of the fan housing 32 has a connection opening 48 in which the connector sleeve 46 is held.
  • a connection opening 48 of the air duct 45 connects.
  • a Strömungsleitrippe 49 is arranged, which divides the supplied air into a plurality of partial streams.
  • the air guide member 44 is made of plastic.
  • the holder 33 extends completely through the cooling region 64 delimited by the air guide component 44.
  • the fan 39 is of an in Fig. 4 schematically shown Lüfterraddeckel 66 from the environment. The Lüfterraddeckel 66 is held on the fan housing 32.
  • Fig. 4 also shows a arranged between the housing parts 36 and 37 seal 50.
  • the seal 50 seals the overflow 20 from the crankcase interior 18 from.
  • a paper seal for sealing against the environment is advantageously provided on the separating surface 40.
  • the fan 39 has on its side facing away from the crankcase 16 a front side blading 60 and at its rear wall 47 of the fan housing 32 facing side, a back side blading 61.
  • the fan housing 32 defines a cooling air spiral.
  • the connection opening 48 is arranged in an overpressure region of the cooling air spiral.
  • cooling air conveyed by the fan wheel 39 is forced into the cooling area 64 through the connection opening 48 and the air duct 45.
  • a pressure damper 65 is integrated, which is arranged immediately upstream of the injection valve in the flow path of the fuel. Also, the pressure damper 65 is cooled by the conveyed through the connection opening 48 cooling air.
  • the cooling air flows along an arrow 57 past the pressure damper 65 through a gap 59 formed between the air guide member 44 and the wall of the crankcase 16.
  • the cooling air also flows past the opposite side of the flow guide rib 49 along an arrow 58.
  • the cooling air flowing along the Arrow 58 flows, flows around the holder 33 and flows on the side facing away from the fan housing 32 of the holder 33 between the crankcase 16 and air guide member 44.
  • the gap 59 is formed circumferentially, so that over the entire edge of the air guide member 44 cooling air flows out.
  • the intake 34 formed in the retainer 33 is open to the environment and not into the cooling area 44.
  • the cooling air delivered under the air guide member 44 does not directly cool the injector, but flows around and cools the retainer 33, causing excessive wear Heating of the injection valve is prevented.
  • the holder 33 is disposed in a receiving opening 52 of the crankcase 16 and sealed with respect to this via the radial seal 42.
  • the receiving opening 52 is formed completely in the first housing part 36, so that the radial seal 42 does not have to be guided over the separating surface 40 between the two housing parts 36 and 37.
  • Fig. 6 schematically shows the holder 33 arranged in the injection valve 43.
  • the metered via the injection valve 43 fuel passes through the outlet channel 35 into the crankcase interior 18th
  • Fig. 7 shows the arrangement of the connection opening 48 in the rear wall 47 of the fan housing 32.
  • the air guide member 44 as well as the holder 33 is not shown.
  • two mounting holes 62 are provided on the first housing part 36, where the holder 33 can be screwed to the crankcase 16.
  • 62 fastening screws 67 are screwed into the mounting holes, which also hold the air guide member 44. For the fixation of the air guide member 44 thereby no additional mounting holes and fasteners are needed.
  • Fig. 7 shows, two mounting holes 63 are provided for mounting a sensor in the mounting hole 31 adjacent to the mounting hole 31.
  • the sensor 53 is in Fig. 8 shown.
  • the sensor 53 is a combined pressure-temperature sensor.
  • Fig. 7 also shows, also formed in the crankcase 16 section of the overflow 20 is divided by the separation surface 40. This is also in Fig. 4 visible, noticeable.
  • the cylinder 19 is advantageously placed with the interposition of a seal.
  • the seal is in particular a paper seal.
  • crankcase 16 and cylinder 17 causes additional thermal insulation of cylinder 17 and crankcase 17, which reduces the heat input from the cylinder 17 into the crankcase 16.
  • a second portion 55 of the Zylinderan gleichflanschs formed on the second housing part 37.
  • Both the first housing part 36 and the second housing part 37 limit the cylinder connection flange.
  • both housing parts 36 and 37 can be removed from the mold in the direction of the axis of rotation 17 of the crankshaft 26 in a die-casting process. Only for the openings for the injection valve 43 and the sensor 53 additional slides are needed or these openings must be made separately.
  • the holder 33 is arranged with the pressure damper 65 immediately adjacent to the connection opening 48. Thereby, the holder 33 with the injection valve 43 and the pressure damper 65 directly from the funded by the fan 39 cooling air flowed.
  • connection opening 48 in the vacuum region of the fan wheel.
  • the injection valve 43 is then cooled by the sucked by the fan cooling air.
  • Both the holder 33 and the air guide member 44 are made of plastic.
  • the components thus act as an insulator, so that there is a poor heat transfer from the crankcase to the injection valve. As a result, it can be ensured even when the machine is turned off that the injection valve is not heated too much, even if the fan is no longer driven, but the crankcase and the cylinder are still warm.
  • the arrangement of the injection valve on the crankcase, the heating of the injection valve is also significantly reduced compared to an arrangement on the cylinder.
  • the holder 33 could alternatively be made entirely or partially of metal. Particularly advantageous is a design is considered in which the standing in contact with the crankcase 16 of the holder 33 is made of plastic and causes isolation to the crankcase 16.
  • the region of the holder 33 which is not in direct contact with the crankcase 16 but is surrounded by cooling air may advantageously be made of metal, so that the heat in the holder 33 is released well via the metallic portion to the environment, in particular to the cooling air. It may alternatively or additionally be provided that the holder 33 has at least one cooling fin for improving the heat release to the cooling air in the region around which cooling air flows.
  • the injection valve 43 itself are in contact with the cooling air and / or have at least one cooling surface, which may be advantageously formed on a cooling fin.
  • the fan housing 32 is formed in the exemplary embodiment of the first housing part 36 of the crankcase 16. However, it may also be advantageous to form the fan housing 32 as a separate component.
  • the fan housing 32 may be in one or more parts and at least partially made of plastic.
  • the fan housing 32 may also be partially or completely formed by adjacent components and limited.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)
EP12008128.6A 2011-12-07 2012-12-05 Appareil de travail Active EP2607642B1 (fr)

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DE102015013784B4 (de) 2015-10-20 2024-12-19 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät mit einem luftgekühlten Verbrennungsmotor
EP3715599B1 (fr) 2019-03-25 2022-02-23 Andreas Stihl AG & Co. KG Moteur à deux temps
DE102020000989A1 (de) 2020-02-15 2021-08-19 Andreas Stihl Ag & Co. Kg Zweitaktmotor und Verfahren zum Betrieb eines Zweitaktmotors
EP4116551A4 (fr) * 2020-03-02 2024-04-24 Yamabiko Corporation Moteur à combustion interne à deux temps et engin de chantier à moteur

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EP0440401A1 (fr) * 1990-01-29 1991-08-07 Yanmar Diesel Engine Co. Ltd. Machine à combustion interne refroidie par air
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Publication number Priority date Publication date Assignee Title
EP3489481A1 (fr) 2017-11-23 2019-05-29 Andreas Stihl AG & Co. KG Appareil de travail portatif

Also Published As

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EP3009665A1 (fr) 2016-04-20
DE102011120464A1 (de) 2013-06-13
US20140000537A1 (en) 2014-01-02
EP3009665B1 (fr) 2018-02-14
CN103174502A (zh) 2013-06-26
EP2607642B1 (fr) 2016-03-09
CN103174502B (zh) 2017-03-01
US10329994B2 (en) 2019-06-25

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