EP3611367B1 - Elastischer verbindungsstutzen - Google Patents

Elastischer verbindungsstutzen Download PDF

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Publication number
EP3611367B1
EP3611367B1 EP18189125.0A EP18189125A EP3611367B1 EP 3611367 B1 EP3611367 B1 EP 3611367B1 EP 18189125 A EP18189125 A EP 18189125A EP 3611367 B1 EP3611367 B1 EP 3611367B1
Authority
EP
European Patent Office
Prior art keywords
connecting piece
channel tube
duct
elastic connecting
expansion fold
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
EP18189125.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3611367A1 (de
Inventor
Daniel Martin
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 EP18189125.0A priority Critical patent/EP3611367B1/de
Priority to CN201910753460.4A priority patent/CN110836154A/zh
Priority to US16/541,882 priority patent/US10954900B2/en
Publication of EP3611367A1 publication Critical patent/EP3611367A1/de
Application granted granted Critical
Publication of EP3611367B1 publication Critical patent/EP3611367B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10078—Connections of intake systems to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/1019—Two-stroke engines; Reverse-flow scavenged or cross scavenged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10072—Intake runners
    • 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
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10078—Connections of intake systems to the engine
    • F02M35/10085—Connections of intake systems to the engine having a connecting piece, e.g. a flange, between the engine and the air intake being foreseen with a throttle valve, fuel injector, mixture ducts or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • 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
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10137—Flexible ducts, e.g. bellows or hoses
    • 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
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10144—Connections of intake ducts to each other or to another device
    • 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
    • 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
    • F02M35/10196—Carburetted engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10301—Flexible, resilient, pivotally or movable parts; Membranes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • 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
    • 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
    • F02M35/10314—Materials for intake systems
    • F02M35/10321—Plastics; Composites; Rubbers

Definitions

  • the invention relates to an elastic connecting piece for arrangement between an internal combustion engine and an air filter of a hand-held working device according to the preamble of claim 1.
  • a connector having a first duct for substantially fuel-free air and a second duct for fuel/air mixture, which is arranged between an internal combustion engine and an air filter.
  • the duct tubes extend from a first engine side to a second air cleaner side of the connector.
  • the two duct tubes are routed as separate ducts, starting from a motor connection flange.
  • the elasticity of the connecting piece is sufficiently large to permit relative movements between the internal combustion engine and the air filter when the connecting piece is installed, without being damaged in the process.
  • the two duct tubes must be connected individually to the respective components of the hand-held implement to which the connector is intended to be connected.
  • the EP 3 026 250 A1 shows a connecting piece with two channel tubes between which an opening is formed.
  • the duct tubes are plugged into an adapter on the air filter side.
  • the DE 10 2007 037 009 A1 discloses a connector with two channels separated by a common partition.
  • the JP 2002 242679 A discloses an internal combustion engine having two ducts which are connected to the engine housing and which are integrally formed rigidly with the engine housing. A through opening is provided between the channels.
  • the invention is based on the object of further developing a connecting piece of the generic type in such a way that, with good elasticity of the connecting piece, a simple connection of the connecting piece is possible on its second side, which is assigned to the air filter.
  • a further object of the invention is to develop a hand-held tool with a connecting piece of this type in such a way that, with good elasticity of the connecting piece, a simple connection of the connecting piece with its second side, assigned to the air filter, to a component of the working tool is possible.
  • the invention provides that the first peripheral wall and the second peripheral wall are arranged at a distance from one another in a longitudinal section of the connecting piece and that the first channel tube and the second channel tube are on the second side lead to a common connecting flange.
  • the first side faces the combustion engine and the second side faces the air filter.
  • Additional components such as a carburetor can be arranged between the connecting piece and the air filter.
  • the first side is also called the engine side and the second side is also called the air filter side.
  • first and the second channel tubes open out at a common connection flange on the second side, a simple connection of the two channel tubes of the connecting piece to a hand-held tool is possible.
  • the two channel tubes do not have to be connected individually to the hand-held implement, but can be connected to the implement simply and quickly by connecting the common connection flange.
  • the ducts end in a single flange on both the first side and the second side, the elasticity of the connecting piece due to the distance between the ducts in the longitudinal section is so great that when the connecting piece is installed, a relative movement between the internal combustion engine and the Air filter of the hand-held implement is possible without the connecting piece being damaged.
  • the component of the working device can be, for example, an air filter, an intermediate component or a carburetor.
  • a continuous opening is expediently formed between the first peripheral wall and the second peripheral wall in the longitudinal section of the connecting piece. This results in great elasticity of the connecting piece.
  • the longitudinal section in which the peripheral walls of the channel tubes are at a distance from one another, extends up to the motor connection flange.
  • the two duct tubes are connected to each other via the motor connection flange.
  • the first duct has an expansion fold running in the circumferential direction of the first duct.
  • the connecting piece when arranged between an internal combustion engine and an air filter of a hand-held implement, the connecting piece can permit comparatively large relative movements between the air filter and the internal combustion engine and at the same time be tightly connected to the air filter and the internal combustion engine.
  • the expansion fold increases the elasticity of the connecting piece in the direction parallel to the connection surface of the motor connection flange.
  • the expansion fold makes it possible to change the absolute length of the first duct tube measured in the direction perpendicular to a connection surface of the motor connection flange.
  • the first duct expediently has an expansion fold running in the circumferential direction.
  • the second channel tube is intended for the supply of fuel/air mixture. If an expansion fold is arranged in the second channel tube, fuel can collect in this expansion fold and from there get into the internal combustion engine in an uncontrolled manner. This is advantageously prevented in that only the first channel tube has the expansion fold running in the circumferential direction.
  • the expansion fold is expediently arranged in the longitudinal section.
  • the expansion fold can extend over the entire circumference of the first channel tube in an advantageous configuration.
  • the movements of the ducts are decoupled from one another to a limited extent, so that a change in length of the second duct is only slightly influenced by the first duct and the mobility provided by the expansion fold is not restricted by the first duct.
  • the distance between the peripheral walls measured in a direction parallel to a connection surface of the motor connection flange starting from a center of the expansion fold, is at least 5% of a height of the motor connection flange.
  • a first wall thickness of the first duct in a first region of the expansion fold is smaller than a second wall thickness of the first duct in a second region of the first duct adjacent to the expansion fold.
  • the expansion fold is expediently arranged closer to the engine side than to the air filter side.
  • the expansion fold runs completely around the first channel tube.
  • the expansion fold protrudes into the continuous opening.
  • the second channel tube has a third area with a third wall thickness and a fourth area with a fourth wall thickness.
  • the third wall thickness is advantageously smaller than the fourth wall thickness.
  • the third region of the second duct is expediently arranged in the longitudinal section of the connecting piece in which the first peripheral wall and the second peripheral wall are arranged at a distance from one another.
  • the connecting piece can have great elasticity, particularly in the longitudinal section.
  • the third area is advantageously arranged closer to the engine side than to the air filter side.
  • the hand-held working device 1 shows a hand-held working device 1 in a schematic side view.
  • the hand-held working device 1 is a chainsaw in the exemplary embodiment. Instead of the power saw 1, other hand-held tools such as a cut-off grinder, hedge trimmers or a brush cutter can also be provided.
  • the hand-held working device 1 has an internal combustion engine 40 for driving a saw chain 19 .
  • the hand-held working device 1 has a carburetor 70 for supplying a fuel/air mixture to the internal combustion engine 40 .
  • the carburetor 70 is advantageously connected to the internal combustion engine 40 via a connecting piece 2 .
  • the carburetor 70 is preferably connected to the clean room of an air filter 90 through which combustion air is sucked in during operation.
  • the fuel supply can take place via a normal carburetor or via an electronically controlled carburetor.
  • the internal combustion engine 40 is advantageously held on a motor housing 80 of the hand-held working device 1 .
  • the internal combustion engine 40 is firmly connected to the engine housing 80 .
  • parts of the motor housing 80 form parts of the internal combustion engine 40, for example a crankcase of the internal combustion engine 40.
  • the hand-held working device 1 has a handle housing 81 with a handle 84 .
  • a throttle lever 85 for actuating the internal combustion engine 40 is arranged on the handle 84 .
  • the air filter 90 is held on the handle housing 81 .
  • the carburetor 70 is advantageously held on the handle housing 81 .
  • the handle housing 81 is separated from the motor housing 80 by an oscillating gap 82 .
  • the oscillating gap 82 is bridged by several anti-vibration elements 83 .
  • the anti-vibration elements 83 connect the motor housing 80 to the handle housing 81 in a vibration-damping manner. Due to the anti-vibration elements 83, the handle housing 81 can perform movements relative to the motor housing 80 during operation.
  • connection pipe 2 and the carburetor 70 are arranged between the air cleaner 90 and the internal combustion engine 40 .
  • the connecting piece 2 is advantageously arranged between the carburetor 70 and the internal combustion engine 40 . Provision can also be made for the connecting piece to be arranged directly between an air filter and an internal combustion engine.
  • the connecting piece 2 bridges the oscillating gap 82 and allows a relative movement between the air filter 90 and the internal combustion engine 40 .
  • the internal combustion engine 40 has a cylinder 41 in which a combustion chamber 43 is formed.
  • the cylinder has a cylinder longitudinal axis 75.
  • the combustion chamber 43 is delimited by a piston 42 mounted in the cylinder 41 to move back and forth.
  • the piston 42 drives a crankshaft 45 via a connecting rod 44 which is rotatably mounted in a crankcase 46 .
  • a mixture inlet 58 which is controlled by the piston 42 in the exemplary embodiment shown opens into the crankcase 46 .
  • the mixture inlet 58 is arranged on the cylinder bore and is opened and closed by the piston skirt of the piston 42 .
  • crankcase 46 is connected to the combustion chamber 43 via two transfer channels 47 and two transfer channels 48 .
  • One overflow channel 47 and one overflow channel 48 are in front of the plane of the drawing 2 arranged and therefore not shown.
  • the overflow ducts 47 and 48 open into the combustion chamber 43 with overflow windows 49 and 50.
  • An outlet 51 leads out of the combustion chamber 43 and is slot-controlled by the piston 42 and in the in 2 shown bottom dead center position of the piston 42 is open.
  • the internal combustion engine 40 is connected to the air filter 90 via an intake passage 64 .
  • the internal combustion engine 40 draws in air via the intake duct 64 .
  • a portion 65 of intake passage 64 is formed in carburetor 70 .
  • the carburetor has a section 70 in which fuel is supplied to the intake combustion air via a main fuel opening 52 and auxiliary fuel openings 54 .
  • the main fuel opening 52 is arranged in the area of a venturi 53 .
  • the sub fuel ports 54 are located downstream of the main fuel port 52 .
  • An adjustable throttle element is arranged in the carburetor 70 .
  • the throttle element is a throttle flap 55 which is pivotably mounted with a throttle shaft 56 .
  • the internal combustion engine 40 is designed as a scavenging template two-stroke engine.
  • the intake duct 64 downstream of the throttle valve 55 is divided into a mixture duct and an air duct.
  • the division into mixture channel and air channel takes place by a partition wall section 57, which extends parallel to the flow direction in the intake channel 64.
  • connection piece 2 the air channel runs in a first channel tube 10 of connection piece 2.
  • the mixture channel runs in connection piece 2 in a second channel tube 20 of connection piece 2.
  • the first channel tube 10 opens with an air inlet 59 on cylinder 41.
  • the second channel tube 20 opens with the Mixture inlet 58 in the area of cylinder 41 into the interior of crankcase 46.
  • air inlet 59 is connected to overflow ports 49 and 50 of overflow channels 47 and 48 via piston pockets 60 formed in the lateral surface of piston 42.
  • the fuel/air mixture is sucked into the crankcase 46 via the second channel tube 20 as the piston 42 moves upwards.
  • scavenging template air is stored upstream in the overflow channels 47 and 48 .
  • largely fuel-free air is drawn in from the first channel tube 10 via the piston pockets 60 via the overflow windows 49 and 50 into the overflow channels 47 and 48 .
  • the fuel/air mixture in the crankcase 46 is compressed.
  • the upstream largely fuel-free air flows through the transfer channels 47 and 48 and then the fuel/air mixture into the combustion chamber 43.
  • the spark plug 61 advantageously protrudes into the combustion chamber 43. Due to the combustion, the piston 42 is accelerated towards the crankcase 46. As soon as the outlet 51 is opened by the piston 42, the exhaust gases can escape from the combustion chamber 43. Through the overflow channels 47 and 48, largely fuel-free air then flows into the combustion chamber 43, which separates the exhaust gases escaping from the outlet 51 from the fresh mixture that flows in afterwards.
  • FIG 3 shows a section through the connecting piece 2 and the carburetor 70 along the longitudinal direction of FIG 2 intake channel 64 shown.
  • the connecting piece 2 has a connecting flange 6 on its air filter side.
  • the connecting piece 2 is connected to the carburetor 70 via the connecting flange 6 .
  • an intermediate ring 71 is arranged between the carburetor 70 and the connecting piece 2, in which a section of the intake channel 64 is formed.
  • the intermediate ring 71 has the partition wall section 57 .
  • the partition wall section 57 advantageously protrudes into the connecting piece 2 .
  • the partition wall section 57 preferably protrudes through the connecting flange 6 of the connecting piece 2 .
  • the intermediate ring 71 is centered in the connecting piece 2 .
  • the dividing wall section 57 of the intermediate ring 71 is advantageously precisely positioned due to the fact that the intermediate ring 71 rests against the circumferential recess 73 of the connecting piece 2 .
  • the connecting piece 2 has a partition wall 67 which separates the first channel tube 10 and the second channel tube 20 of the connecting piece 2 from one another.
  • the dividing wall 67 of the connecting piece 2 is advantageously in contact with the dividing wall section 57 of the intermediate ring 71 .
  • the partition wall 67 continues the partition wall section 57 .
  • the intermediate ring 71 is made of dimensionally stable material, advantageously made of metal or dimensionally stable plastic.
  • the partition wall section 57 stabilizes and preferably holds the partition wall 67 during relative movements between the motor housing 81 and the handle housing 80.
  • the partition wall 67 of the connecting piece has 2 a contact projection 72 on.
  • the partition section 57 of the intermediate ring 71 advantageously has a contact projection 62 .
  • the contact projection 72 of the partition wall 67 of the connecting piece 2 and the contact projection 62 of the partition wall section 57 of the intermediate ring 71 overlap one another in the longitudinal direction 100 . With it bending of the elastic contact projection 72 during movements during operation can be avoided.
  • the air duct sections of the carburetor 70 and the connecting piece 2 and the mixture duct sections of the carburetor 70 and the connecting piece 2 can advantageously also be connected at the same time.
  • the dividing wall section 57 extends, starting from the contact point on the dividing wall 67 of the connecting piece 2, counter to the direction of flow to near the throttle shaft 56.
  • the throttle valve 55 rests on the dividing wall section 57 of the intermediate ring 70, so that between the Throttle flap 55 and the partition section 57, if possible, no fuel/air mixture can pass from the mixture channel into the air channel.
  • the throttle valve 55 and the partition wall 57 lie approximately in a common plane.
  • a gap can be formed between the throttle valve 55 and the partition wall 57 of the carburetor 70, through which the fuel/air mixture can pass from the mixture channel into the air channel.
  • a choke valve 63 is arranged in the carburetor 70 downstream of the throttle valve 55 .
  • a further partition wall section can be provided between the throttle flap 55 and the choke flap 63 for separating the air duct and mixture duct.
  • the connecting piece 2 permits a relative movement of the internal combustion engine 40 held on the motor housing 80 and the air filter 90 held on the handle housing 81 ( Figures 1 and 2 ). Likewise, an unimpeded relative movement of the internal combustion engine 40 and the carburetor 70 is possible through the connecting piece 2 .
  • the connector 2 is at least partially made of elastic material, for example elastomer.
  • the connecting piece 2 is designed in one piece according to the invention.
  • the connecting piece 2 has a first side 3 which is intended for connection to the internal combustion engine 40 .
  • the first side 3 is also referred to as the motor side.
  • the connecting piece 2 has a second side 4 for connecting the connecting piece 2 to a component of the hand-held implement 1 .
  • the component to which the connecting piece 2 is connected is the carburetor 70.
  • the connecting piece is connected directly to the air filter.
  • the second side 4 is also referred to as the air filter side.
  • the air filter side of the connecting piece 2 faces away from the engine side of the connecting piece 2 .
  • the connecting piece 2 has an engine connection flange 5 on its first side 3 for connection to the internal combustion engine 40 .
  • the first channel tube 10 and the second channel tube 20 of the connecting piece 2 open out on the motor connection flange 5.
  • the motor connection flange 5 has a largely flat connection surface 9 for contact with the internal combustion engine 40 .
  • a longitudinal direction 100 runs perpendicularly to the connection surface 9 of the motor connection flange 5 in the direction of the second side 4.
  • Circumferential sealing lips 25 and 35 stand out from the planar connection surface 9 shown.
  • the sealing lip 35 is provided to seal the connection between the internal combustion engine 40 and the first duct 10 .
  • the sealing lip 25 is provided to seal the connection between the internal combustion engine 40 and the second duct 20 .
  • the first channel tube 10 and the second channel tube 20 are in the direction of FIG 2 cylinder longitudinal axis 75 shown arranged one above the other.
  • the first channel tube 10 opens into a first outlet opening 26 of the connecting piece 2 on the first side 3 of the connecting piece 2.
  • the second channel tube 20 opens into a second outlet opening 36 of the connecting piece 2.
  • the first outlet opening 26 and the second outlet opening 36 are preferably at a distance a from one another in the direction of the cylinder longitudinal axis 75.
  • connection surface 9 preferably has four connection openings 11 .
  • the connecting piece 2 can be fastened to the internal combustion engine 40 by means of screws through the connecting openings 11 .
  • the engine connection flange 5 In order to connect the first duct 10 and the second duct 20 to the internal combustion engine 40 , only the engine connection flange 5 has to be connected to the internal combustion engine 40 . It is not necessary to connect each duct 10, 20 to the internal combustion engine 40 individually.
  • the motor connection flange 5 has a width b1 measured in the longitudinal direction 100 .
  • the motor connection flange 5 advantageously includes a reinforcement core 15.
  • the reinforcement core 15 can be made of dimensionally stable material, for example metal.
  • the reinforcement core 15 is surrounded by an elastic material.
  • the elastic material can be rubber or an elastic plastic, for example.
  • the reinforcing core 15 extends at least between the first duct 10 and the second duct 20 over at least two-thirds of the width b1 of the motor connection flange 5. How 6 12, the reinforcing core 15 may be in the form of a plate.
  • the plate-shaped reinforcement core 15 is in the embodiment of the exit openings 26, 36 ( figure 5 ) of the first duct 10 and the second duct 20 completely penetrated. From the synopsis of 2 and 5 It can be seen that the first exit opening 26 of the first duct 10 is provided in the wall of the cylinder 41 for connection to the air inlet 59 . The second outlet opening 36 of the second channel tube 20 is provided for connection to the mixture inlet 58 in the wall of the cylinder 41 .
  • the first channel tube 10 and the second channel tube 20 open out on the second side 4 at the common connecting flange 6 at a common opening 7.
  • An outer contour 8 of the opening 7 is preferably circular.
  • the circular outer contour 8 of the mouth opening 7 has a diameter c.
  • connection between the first duct 10 and the carburetor 70 and the connection between the second duct 20 and the carburetor 70 only a single connection point between the connection flange 6 of the connecting piece 2 on the second side 4 and the carburetor 70 has to be sealed.
  • the first channel tube 10 and the second channel tube 20 extend to the engine side of the connecting piece 2.
  • the first channel tube 10 has a first length 11 measured in the longitudinal direction 100 from the connection surface 9 to the common opening 7 of the connection flange 6 on the second side 4 .
  • the second channel tube 20 has a second length l2 measured in the longitudinal direction 100 from the connection surface 9 to the common opening 7 of the connection flange 6 on the second side 4 .
  • the common mouth opening 7 is delimited by a plane G which separates the channel tubes 10, 20 from the peripheral depression 73 for the intermediate ring 71.
  • the lengths l1 and l2 extend from the connection surface 9 to the plane G.
  • the second length l2 is greater than the first length 11.
  • connection flange 6 on the second side 4 of the connecting piece 2 has a contact surface 69 for contact with a component of the hand-held working device 1 .
  • the connecting piece 2 rests with the contact surface 69 on the carburetor 70, as in 3 shown.
  • 46 shows that the connection surface 9 on the first side 3 and the contact surface 69 on the second side 4 are at an angle ⁇ of 10° to 80°, in particular from 15° to 45°, preferably from 25° to 35°. are oriented to each other.
  • the angle ⁇ opens in the direction from the first duct 10 to the second duct 20.
  • the first duct 10 has a first peripheral wall 17.
  • the second duct 20 has a second peripheral wall 27.
  • the first peripheral wall 17 of the first duct 10 and the second peripheral wall 27 of the second In a longitudinal section 31 of the connecting piece 2, the first peripheral wall 17 of the first channel tube 10 and the second peripheral wall 27 of the second channel tube 20 are arranged at a distance v from one another. Provision can be made for the first peripheral wall 17 and the second peripheral wall 27 to be connected in the longitudinal section 31 of the connecting piece 2 by a thin, membrane-like skin.
  • a continuous opening 30 is formed according to the invention between the first peripheral wall 17 and the second peripheral wall 27 in the longitudinal section 31, which is also in the 2 and 3 is shown.
  • the through opening 30 extends between the first channel tube 10 and the second channel tube 20 parallel to the connection surface 9 of the motor connection flange 5.
  • the through opening 30 extends in an in 2 shown plane E, which is perpendicular to the longitudinal axis 75 of the cylinder.
  • the through-opening 30 has an inner peripheral wall 32. The through-opening 30 completely penetrates the connecting piece 2 in the direction perpendicular to the longitudinal direction 100.
  • the connecting piece 2 has an overall length l3 measured in the longitudinal direction 100 .
  • the longitudinal section 31 advantageously extends over at least a quarter, in particular at least 30% of the total length l3.
  • the longitudinal section 31 advantageously extends over at least 30% of the second length l2 of the second duct tube 20.
  • the longitudinal section 31 extends to the motor connection flange 5.
  • the partition wall 67 of the connecting piece 2 is separated from both the first peripheral wall 17 of the first duct tube 10 as well as the second peripheral wall 27 of the second channel tube 20 is formed.
  • the dividing wall 67 of the connecting piece 2 in the region of the orifice 7 is formed both by the first peripheral wall 17 and by the second peripheral wall 27 .
  • the motor connection flange 5 has a height h1 measured parallel to its connection surface 9 in the direction from the first duct 10 to the second duct 20 .
  • a height h2 measured in the middle with respect to the longitudinal extent of the longitudinal section 31 in the direction of the height h1 of the motor connection flange 5 is advantageously at least 3%, in particular 5% of the height h1 of the motor connection flange 5.
  • the first duct 10 has an expansion fold 12 running in the circumferential direction 101 of the first duct 10.
  • the circumferential direction 101 runs around the longitudinal direction 100.
  • the first duct 10 has a larger diameter than in an area outside of the expansion fold 12.
  • a first wall thickness w1 of the first duct 10 in a first region 13 of the expansion fold 12 is advantageously smaller than a second wall thickness w2 of the first duct 10 in a second region 14 of the first sewer tube 10 adjacent to the expansion fold 12 in the longitudinal direction 100.
  • the expansion fold 12 is preferably arranged in the longitudinal section 31.
  • the expansion fold 12 runs completely around the first channel tube 10 .
  • the expansion fold 12 advantageously protrudes into the continuous opening 30 .
  • the second channel tube 20 is advantageously free of expansion folds.
  • the expansion fold 12 extends in the longitudinal direction 100 over a first extension area 18.
  • the first peripheral wall 17 is turned outwards to form the expansion fold 12.
  • the beginning and end of the first extension region 18 are shown in FIG 6 characterized by a deviation from the course of the first peripheral wall 17 in the longitudinal direction 100.
  • the first peripheral wall 17 is curved towards the outside of the channel.
  • the wall thickness of the first peripheral wall 17 in the first extension area 18 decreases, starting from the start of the first extension area 18 to a center 16 of the expansion fold 12, and increases again as it progresses from the center 16 of the expansion fold 12 to the end of the first extension area 18.
  • the center 16 of the expansion fold 12 advantageously has the smallest wall thickness of the first peripheral wall 17, namely the first wall thickness w1 of the first area 13.
  • the first area 13 of the expansion fold 12 is arranged in the first extension area 18 of the expansion fold 12.
  • the second region 14 of the first duct 10 is arranged outside of the first extension region 18 of the expansion fold 12 .
  • a distance v between the first peripheral wall 17 of the first duct tube 10 and the second peripheral wall 27 of the second duct tube 20, measured in a direction parallel to the connection surface 9 of the motor connection flange 5 starting from the center 16 of the expansion fold 12, is advantageously at least 5% of the height h1 of the motor connection flange 5 .
  • the longitudinal section 31 can be arranged closer to the first side 3 than to the second side 4 with respect to the longitudinal direction 100 .
  • the expansion fold 12 is advantageously arranged closer to the first side 3 than to the second side 4 with respect to the longitudinal direction 100 .
  • the center 16 of the expansion fold 12 has a first greatest distance d1, measured in the longitudinal direction 100, from the connection surface 9 of the motor connection flange 5.
  • the first greatest distance d1 is advantageously less than 50%, in particular less than 45%, of the first length 11 of the first duct tube 10.
  • the second duct 20 can have a third region 23 with a third wall thickness w3.
  • the second duct 20 can have a fourth region with a fourth wall thickness w4.
  • the third wall thickness w3 is advantageously smaller than the fourth wall thickness w4.
  • the third area 23 of the second channel pipe 20 is arranged in the longitudinal section 31 with respect to the longitudinal direction 100 .
  • the third area 23 of the second channel tube 20 preferably extends in the longitudinal direction 100 over a second extension area 28.
  • the end and the beginning of the second extension area with respect to the longitudinal direction 100 are characterized by a deviation of the wall thickness from the fourth wall thickness w4.
  • the third region 23 preferably runs around the second channel tube 20 .
  • the third area 23 is advantageously arranged closer to the first side 3 than to the second side 4 .
  • a second distance d2 measured in the longitudinal direction between the connection surface 9 of the motor connection flange 5 and the third region 23 of the second duct 20 is advantageously less than a third, in particular less than a quarter, of the second length l2 of the second duct 20.
  • the first extension area 18 of the expansion fold 12 of the first conduit tube 10 and the second extension area 28 of the third area 23 of the second conduit tube 20 preferably overlap in the longitudinal direction 100.
  • the first extension area 18 and the second extension area 28 overlap in the longitudinal direction 100 a distance of at least two thirds of the first extension area 18.
  • the second extension area 28 is further away from the connection surface 9 of the motor connection flange 5 than the first extension area 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Gasket Seals (AREA)
EP18189125.0A 2018-08-15 2018-08-15 Elastischer verbindungsstutzen Active EP3611367B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18189125.0A EP3611367B1 (de) 2018-08-15 2018-08-15 Elastischer verbindungsstutzen
CN201910753460.4A CN110836154A (zh) 2018-08-15 2019-08-15 弹性连接接管
US16/541,882 US10954900B2 (en) 2018-08-15 2019-08-15 Elastic connecting support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18189125.0A EP3611367B1 (de) 2018-08-15 2018-08-15 Elastischer verbindungsstutzen

Publications (2)

Publication Number Publication Date
EP3611367A1 EP3611367A1 (de) 2020-02-19
EP3611367B1 true EP3611367B1 (de) 2023-08-09

Family

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Application Number Title Priority Date Filing Date
EP18189125.0A Active EP3611367B1 (de) 2018-08-15 2018-08-15 Elastischer verbindungsstutzen

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US (1) US10954900B2 (zh)
EP (1) EP3611367B1 (zh)
CN (1) CN110836154A (zh)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD907065S1 (en) * 2019-08-09 2021-01-05 Wehrli Custom Fabrication, Inc. Adapter for installation of a turbocharger
CN113107662A (zh) * 2021-05-08 2021-07-13 永康市茂金园林机械有限公司 一种用于分层扫气二冲程发动机的汽缸活塞单元

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4203885A1 (de) 1992-02-11 1993-08-12 Stihl Maschf Andreas Handgefuehrtes arbeitsgeraet wie motorkettensaege, trennschleifer o. dgl.
SE9303470L (sv) 1993-10-21 1995-04-22 Electrolux Ab Insugningsrör för en förbränningsmotor
JP2002242679A (ja) * 2001-02-20 2002-08-28 Zama Japan Kk 層状掃気２サイクルエンジン
DE10213414A1 (de) * 2002-03-26 2003-10-09 Stihl Maschf Andreas Verbindungsstutzen
DE10213415B4 (de) 2002-03-26 2017-06-01 Andreas Stihl Ag & Co. Verbindungsstutzen
US8516989B2 (en) * 2003-09-02 2013-08-27 Andreas Stihl Ag & Co. Kg Internal combustion engine having an elastic connecting duct
DE20313567U1 (de) 2003-09-02 2003-10-30 Andreas Stihl AG & Co. KG, 71336 Waiblingen Elastischer Verbindungsstutzen
DE602004024132D1 (de) 2004-07-09 2009-12-24 Husqvarna Ab Flexibles einlasssystem für einen zweitakt-brennkraftmotor mit zusätzlicher luftversorgung mit einer ablenkplatte zur befestigung von kanälen an der zylinderwand
DE102007037009A1 (de) * 2006-08-09 2008-03-06 Andreas Stihl Ag & Co. Kg Verbrennungsmotor
DE102008006681A1 (de) * 2008-01-30 2009-08-06 Andreas Stihl Ag & Co. Kg Verbrennungsmotor mit einem elastischen Verbindungsstutzen und Verfahren zur Herstellung eines elastischen Verbindungsstutzens
DE102009059143B4 (de) 2009-12-19 2020-01-23 Andreas Stihl Ag & Co. Kg Zweitaktmotor und Sandkern zur Herstellung eines Zweitaktmotors
DE102010054840B4 (de) * 2010-12-16 2020-03-26 Andreas Stihl Ag & Co. Kg Zweitaktmotor
DE102013012510A1 (de) * 2013-07-27 2015-01-29 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät und elastischer Verbindungsstutzen für ein handgeführtes Arbeitsgerät
JP6432081B2 (ja) * 2014-11-28 2018-12-05 株式会社やまびこ 層状掃気エンジンの吸入管ユニット

Also Published As

Publication number Publication date
CN110836154A (zh) 2020-02-25
US10954900B2 (en) 2021-03-23
EP3611367A1 (de) 2020-02-19
US20200056569A1 (en) 2020-02-20

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