EP3611367A1 - Manchon de raccordement élastique - Google Patents

Manchon de raccordement élastique Download PDF

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Publication number
EP3611367A1
EP3611367A1 EP18189125.0A EP18189125A EP3611367A1 EP 3611367 A1 EP3611367 A1 EP 3611367A1 EP 18189125 A EP18189125 A EP 18189125A EP 3611367 A1 EP3611367 A1 EP 3611367A1
Authority
EP
European Patent Office
Prior art keywords
channel tube
connecting piece
connection
expansion fold
channel
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
EP18189125.0A
Other languages
German (de)
English (en)
Other versions
EP3611367B1 (fr
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/fr
Priority to CN201910753460.4A priority patent/CN110836154A/zh
Priority to US16/541,882 priority patent/US10954900B2/en
Publication of EP3611367A1 publication Critical patent/EP3611367A1/fr
Application granted granted Critical
Publication of EP3611367B1 publication Critical patent/EP3611367B1/fr
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
    • 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
    • F02M35/1019—Two-stroke engines; Reverse-flow scavenged or cross scavenged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—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 implement according to the preamble of claim 1.
  • a connecting piece with a first channel tube for largely fuel-free air and with a second channel tube for fuel / air mixture, which is arranged between an internal combustion engine and an air filter.
  • the channel tubes extend from a first side associated with the internal combustion engine to a second side associated with the air filter of the connecting piece.
  • the two duct tubes are guided as separate ducts.
  • the elasticity of the connecting piece is sufficiently large to permit relative movements between the internal combustion engine and the air filter in the installed state of the connecting piece without being damaged in the process.
  • the two sewer pipes must be individually connected to the respective components of the hand-held implement with which the connecting piece is to be connected.
  • the invention has for its object to develop a generic connecting piece such that with good elasticity of the connecting piece, a simple connection of the connecting piece on its second side associated with the air filter is possible.
  • Another object of the invention is to further develop a hand-held work tool with a generic connecting piece in such a way that, with good elasticity of the connecting piece, simple connection of the connecting piece with its second side, which is assigned to the air filter, to a component of the working device is possible.
  • the invention provides that the first circumferential wall and the second circumferential 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 open on the second side at a common connecting flange.
  • the connection piece When the connection piece is installed, the first side faces the internal combustion engine and the second side faces the air filter. Further 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 sewer pipes lead to a common connecting flange on the second side makes it easy to connect the two sewer pipes of the connecting piece to a hand-held implement.
  • the two sewer pipes do not have to be individually connected to the hand-held implement, but can be easily and quickly connected to the implement by connecting the common connecting flange.
  • the channel tubes each lead to a single flange on both the first side and on the second side, the elasticity of the connecting piece is determined by the spacing of the Channel tubes in the longitudinal section are so large that in the installed state of the connecting piece, 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 in the process.
  • the component of the implement can be, for example, an air filter, an intermediate component or a carburetor.
  • a through opening is expediently formed in the longitudinal section of the connecting piece between the first peripheral wall and the second peripheral wall. This results in a 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, advantageously extends up to the motor connection flange.
  • the two duct tubes are connected to each other via the motor connection flange.
  • the first channel tube has an expansion fold extending in the circumferential direction of the first channel tube.
  • the connecting piece when arranged between an internal combustion engine and an air filter of a hand-held implement, can allow 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 channel tube, measured in the direction perpendicular to a connection surface of the motor connection flange.
  • the first channel tube 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 enter the internal combustion engine in an uncontrolled manner. This is advantageously prevented by the fact 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 advantageously extend over the entire circumference of the first channel tube.
  • the movements of the channel tubes are decoupled from one another to a limited extent, so that a change in length of the second channel tube is only slightly influenced by the first channel tube and the mobility provided by the expansion fold is not restricted by the first channel tube.
  • the distance between the peripheral walls measured in the 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 channel tube in a first area of the expansion fold is smaller than a second wall thickness of the first channel tube in a second area of the first channel tube 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 advantageously runs completely around the first channel tube.
  • the expansion fold protrudes into the through 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 channel tube 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 region is advantageously arranged closer to the engine side than to the air filter side.
  • Fig. 1 shows a schematic side view of a hand-held implement 1.
  • the hand-held implement 1 is a chain saw in the embodiment. Instead of the chainsaw 1, other hand-held tools such as a cut-off machine, hedge trimmers or a brush cutter can also be provided.
  • the hand-held implement 1 has an internal combustion engine 40 for driving a saw chain 19.
  • the hand-held implement 1 has a carburetor 70 for supplying 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 via which combustion air is sucked in during operation.
  • the fuel can be supplied by means of a normal carburetor or by means of an electronically controlled carburetor.
  • the internal combustion engine 40 is advantageously held on a motor housing 80 of the hand-held implement 1.
  • the internal combustion engine 40 is firmly connected to the motor housing 80. It can be provided that parts of the engine housing 80 form parts of the internal combustion engine 40, for example a crankcase of the internal combustion engine 40.
  • the hand-held implement 1 has a handle housing 81 with a handle 84. A gas 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 vibration gap 82 is bridged by a plurality of 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 relative movements with respect to the
  • the connecting piece 2 and the carburetor 70 are arranged between the air filter 90 and the internal combustion engine 40.
  • the connecting piece 2 is advantageously arranged between the carburetor 70 and the internal combustion engine 40. It can also be provided that the connecting piece is arranged directly between an air filter and an internal combustion engine.
  • the connecting piece 2 bridges the vibration 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 which is mounted to and fro in the cylinder 41.
  • 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.
  • the crankcase 46 is connected to the combustion chamber 43 via two overflow channels 47 and two overflow channels 48.
  • one overflow channel 47 and one overflow channel 48 are in front of the drawing plane in Fig. 2 arranged and therefore not shown.
  • the overflow channels 47 and 48 open into the combustion chamber 43 with overflow windows 49 and 50.
  • An outlet 51 which is slot-controlled by the piston 42 and leads into the combustion chamber 43, leads out of the combustion chamber 43 Fig. 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 duct 64. During operation, the internal combustion engine 40 draws in air via the intake duct 64. A portion 65 of the intake passage 64 is formed in the 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 secondary fuel openings 54.
  • the main fuel opening 52 is arranged in the region of a venturi 53.
  • the sub fuel openings 54 are arranged downstream of the main fuel opening 52.
  • An adjustable throttle element is arranged in the carburetor 70.
  • the throttle element is a throttle valve 55 which is pivotably mounted with a throttle shaft 56.
  • the internal combustion engine 40 is designed as a flushing master two-stroke engine.
  • the intake duct 64 is divided into a mixture duct and an air duct downstream of the throttle valve 55.
  • the mixture channel and air channel are divided by a partition section 57. which extends parallel to the direction of flow in the intake duct 64.
  • the air channel runs in a first channel tube 10 of the connecting piece 2.
  • the mixture channel runs in the connecting piece 2 in a second channel tube 20 of the connecting piece 2.
  • the first channel tube 10 opens out with an air inlet 59 on the cylinder 41.
  • the second channel tube 20 opens out with the Mixture inlet 58 in the area of the cylinder 41 into the interior of the crankcase 46.
  • the air inlet 59 is connected to the overflow windows 49 and 50 of the overflow channels 47 and 48 via piston pockets 60 formed in the outer surface of the piston 42.
  • the fuel / air mixture is drawn into the crankcase 46 via the second channel tube 20 when the piston 42 moves upward.
  • rinsing master air is stored in the overflow channels 47 and 48.
  • largely fuel-free air is drawn in via the overflow windows 49 and 50 into the overflow channels 47 and 48 via the piston pockets 60 from the first channel tube 10.
  • the fuel / air mixture in the crankcase 46 is compressed.
  • the upstream largely fuel-free air and then the fuel / air mixture flow through the overflow channels 47 and 48 into the combustion chamber 43.
  • the mixture in the combustion chamber 43 compressed and ignited by a spark plug 61 in the area of the top dead center of the piston 42.
  • the spark plug 61 advantageously projects into the combustion chamber 43. Because of the combustion, the piston 42 is accelerated toward 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. Then largely fuel-free air flows through the overflow channels 47 and 48 into the combustion chamber 43, which separates the exhaust gases escaping from the outlet 51 from the fresh mixture flowing in.
  • Fig. 3 shows a section through the connecting piece 2 and the carburetor 70 along the longitudinal direction of FIG 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 duct 64 is formed.
  • the intermediate ring 71 has the partition wall section 57.
  • the dividing wall section 57 advantageously projects into the connecting piece 2.
  • the dividing wall section 57 preferably projects through the connecting flange 6 of the connecting piece 2.
  • the intermediate ring 71 is inserted into a circumferential recess 73 on the connecting piece 2.
  • the intermediate ring 71 is centered in the connecting piece 2.
  • the partition wall section 57 of the intermediate ring 71 is advantageously precisely positioned by the abutment of the intermediate ring 71 on the circumferential recess 73 of the connecting piece 2.
  • the connecting piece 2 has a dividing wall 67 which separates the first duct 10 and the second duct 20 of the connecting piece 2 from one another.
  • the partition wall 67 of the connecting piece 2 advantageously abuts the partition wall section 57 of the intermediate ring 71.
  • the partition 67 continues the partition section 57.
  • the intermediate ring 71 is made of dimensionally stable material, advantageously of metal or dimensionally stable plastic.
  • the partition wall section 57 stabilizes and holds the partition wall 67 preferably during relative movements between the motor housing 81 and the handle housing 80 2 an investment projection 72.
  • the partition wall section 57 of the intermediate ring 71 advantageously has a contact projection 62.
  • the contact projection 72 of the dividing wall 67 of the connecting piece 2 and the contact projection 62 of the dividing wall section 57 of the intermediate ring 71 lie against one another in the longitudinal direction 100. In order to deflection of the elastic contact projection 72 during movements during operation can be avoided.
  • the partition section 57 extends from the contact point on the partition 67 of the connecting piece 2 against the flow direction up to the throttle shaft 56.
  • the throttle valve 55 In the full throttle position of the throttle valve 55, the throttle valve 55 abuts the partition section 57 of the intermediate ring 70, so that between the Throttle valve 55 and the partition wall section 57 as far as possible no fuel / air mixture can pass from the mixture channel into the air channel.
  • the throttle valve 55 and the partition 57 are approximately in a common plane.
  • a gap can be formed between the throttle valve 55 and the partition 57 of the carburetor 70 through which the fuel / air mixture can pass from the mixture duct into the air duct.
  • 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 valve 55 and the choke valve 63 for separating the air duct and the mixture duct.
  • the connecting piece 2 permits a relative movement of the internal combustion engine 40 held on the motor housing 80 and of the air filter 90 held on the handle housing 81 ( 1 and 2 ). In the same way, an unimpeded relative movement of the internal combustion engine 40 and the carburetor 70 is possible through the connecting piece 2.
  • the connecting piece 2 is at least partially formed from elastic material, for example from elastomer. Like for example in Fig. 4 shown, the connecting piece 2 is preferably formed in one piece.
  • the connecting piece 2 has a first side 3, which is provided 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 an air filter side.
  • the air filter side of the connecting piece 2 faces away from the motor side of the connecting piece 2.
  • the connecting piece 2 has on its first side 3 an engine connection flange 5 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 at the motor connection flange 5.
  • the motor connection flange 5 has a largely flat connection surface 9 for contacting the internal combustion engine 40.
  • a longitudinal direction 100 starting from the first side 3 runs perpendicular to the connection surface 9 of the motor connection flange 5 in the direction of the second side 4, a longitudinal direction 100.
  • connection surface 9 shown protrude all-round sealing lips 25 and 35.
  • the sealing lip 35 is provided for sealing the connection between the internal combustion engine 40 and the first channel tube 10.
  • the sealing lip 25 is provided for sealing the connection between the internal combustion engine 40 and the second channel tube 20.
  • the first duct 10 and the second duct 20 are in the direction of FIG Fig. 2 shown cylinder longitudinal axis 75 arranged one above the other.
  • the first duct 10 opens into a first outlet opening 26 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. Through the connection openings 11, the connecting piece 2 can be fastened to the internal combustion engine 40 by means of screws. To connect the first channel tube 10 and the second channel tube 20 to the internal combustion engine 40, only the motor connection flange 5 then has to be connected to the internal combustion engine 40. It is not necessary to connect each duct 10, 20 individually to the internal combustion engine 40.
  • the motor connection flange 5 has a width b1 measured in the longitudinal direction 100.
  • the motor connection flange 5 advantageously comprises a reinforcement core 15.
  • the reinforcement core 15 can be made of dimensionally stable material, for example of metal.
  • the reinforcement core 15 is enclosed by an elastic material.
  • the elastic material can be rubber or an elastic plastic, for example.
  • the reinforcement core 15 extends at least between the first channel tube 10 and the second channel tube 20 over at least two thirds of the width b1 of the motor connection flange 5.
  • the reinforcing core 15 may be in the form of a plate.
  • the plate-shaped reinforcing core 15 is in the embodiment of the outlet openings 26, 36 ( Fig.
  • first outlet opening 26 of the first channel tube 10 is provided for connection to the air inlet 59 in the wall of the cylinder 41.
  • 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.
  • An outer contour 8 of the mouth opening 7 is preferably circular.
  • the circular outer contour 8 of the mouth opening 7 has a diameter c.
  • the first channel tube 10 and the second channel tube 20 extend to the motor side of the connecting piece 2.
  • the first channel tube 10 has a first length l1 measured in the longitudinal direction 100 from the connection surface 9 to the common mouth 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 opening 7 is delimited by a plane G which separates the channel tubes 10, 20 from the circumferential recess 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 l1.
  • the connecting flange 6 on the second side 4 of the connecting piece 2 has a contact surface 69 for contacting a component of the hand-held implement 1.
  • the connecting piece 2 with the contact surface 69 lies against the carburetor 70, as in FIG Fig. 3 shown.
  • 46 shows that the connection surface 9 on the first side 3 and the contact surface 69 on the second side 4 at an angle ⁇ of 10 ° to 80 °, in particular of 15 ° to 45 °, preferably of 25 ° to 35 °, are oriented towards each other.
  • the angle ⁇ opens in the direction from the first duct 10 to the second duct 20.
  • the first channel tube 10 has a first peripheral wall 17.
  • the second channel tube 20 has a second peripheral wall 27.
  • the first peripheral wall 17 of the first channel tube 10 and the second peripheral wall 27 of the second Channel tube 20 together the partition wall 67 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. It can be provided that the first peripheral wall 17 and the second peripheral wall 27 are connected in the longitudinal section 31 of the connecting piece 2 by a thin, membrane-like skin.
  • a continuous opening 30 is advantageously formed in the longitudinal section 31 between the first peripheral wall 17 and the second peripheral wall 27, which also extends into the Fig. 2 and 3 is shown.
  • the through opening 30 extends between the first duct 10 and the second duct 20 parallel to the connection surface 9 of the motor connection flange 5.
  • the through opening 30 extends in an in Fig. 2 shown plane E, which extends 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 a total 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 both from the first peripheral wall 17 of the first duct tube 10 and also formed by the second circumferential wall 27 of the second channel tube 20.
  • the partition wall 67 of the connecting piece 2 is formed in the region of the mouth opening 7 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 channel tube 10 to the second channel tube 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 channel tube 10 has an expansion fold 12 extending in the circumferential direction 101 of the first channel tube 10.
  • the circumferential direction 101 runs around the longitudinal direction 100.
  • the first length l1 of the first channel tube 10 can be increased.
  • the first duct tube 10 has a larger diameter than in a region outside the expansion fold 12.
  • a first wall thickness w1 of the first duct tube 10 in a first region 13 of the expansion fold 12 is advantageously smaller than a second wall thickness w2 of the first duct tube 10 in a second region 14 of the first channel 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 duct 10.
  • the expansion fold 12 advantageously projects into the through opening 30.
  • the first duct tube 10 has an expansion fold 12 running in the circumferential direction 101.
  • 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 region 18.
  • the first circumferential wall 17 is turned outwards to form the expansion fold 12.
  • the beginning and end of the first extension area 18 are in the exemplary embodiment according to Fig. 6 characterized by a deviation from the course of the first peripheral wall 17 in the longitudinal direction 100.
  • the first circumferential wall 17 is curved toward the outside of the channel.
  • the wall thickness of the first circumferential wall 17 in the first extension region 18 preferably decreases from the beginning of the first extension region 18 to a center 16 of the expansion fold 12 and increases again in the further course from the center 16 of the expansion fold 12 towards the end of the first extension region 18.
  • the center 16 of the expansion fold 12 advantageously has the smallest wall thickness of the first circumferential 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 channel tube 10 is arranged outside the first extension region 18 of the expansion fold 12.
  • a distance v measured in the direction parallel to the connection surface 9 of the motor connection flange 5, starting from the center 16 of the expansion fold 12, between the first peripheral wall 17 of the first channel tube 10 and the second peripheral wall 27 of the second channel tube 20 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 with respect to the longitudinal direction 100 than to the second side 4.
  • the expansion fold 12 is advantageously arranged closer to the first side 3 with respect to the longitudinal direction 100 than to the second side 4.
  • the center 16 of the expansion fold 12 has a first largest distance d1, measured in the longitudinal direction 100, from the connection surface 9 of the motor connection flange 5.
  • the first largest distance d1 is advantageously less than 50%, in particular less than 45%, of the first length l1 of the first channel tube 10.
  • the second channel tube 20 can have a third region 23 with a third wall thickness w3.
  • the second channel tube 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 region 23 of the second channel tube 20 is arranged in the longitudinal section 31 with respect to the longitudinal direction 100.
  • the third region 23 of the second channel tube 20 preferably extends in the longitudinal direction 100 over a second extension region 28.
  • the end and the beginning of the second extension region 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 region 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 channel tube 20 is advantageously less than a third, in particular less than a quarter, of the second length l2 of the second channel tube 20.
  • the first extension area 18 of the expansion fold 12 of the first channel tube 10 and the second extension area 28 of the third area 23 of the second channel 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 Manchon de raccordement élastique Active EP3611367B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18189125.0A EP3611367B1 (fr) 2018-08-15 2018-08-15 Manchon de raccordement élastique
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 (fr) 2018-08-15 2018-08-15 Manchon de raccordement élastique

Publications (2)

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

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Application Number Title Priority Date Filing Date
EP18189125.0A Active EP3611367B1 (fr) 2018-08-15 2018-08-15 Manchon de raccordement élastique

Country Status (3)

Country Link
US (1) US10954900B2 (fr)
EP (1) EP3611367B1 (fr)
CN (1) CN110836154A (fr)

Families Citing this family (2)

* 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

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JP2002242679A (ja) * 2001-02-20 2002-08-28 Zama Japan Kk 層状掃気２サイクルエンジン
DE102004037187A1 (de) 2003-09-02 2005-03-24 Andreas Stihl Ag & Co. Kg Elastischer Verbindungsstutzen
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
DE102010054840A1 (de) * 2010-12-16 2012-06-21 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
EP3026250A1 (fr) * 2014-11-28 2016-06-01 Yamabiko Corporation Unité à tube d'aspiration d'un moteur à balayage stratifié

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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
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
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
DE102009059143B4 (de) 2009-12-19 2020-01-23 Andreas Stihl Ag & Co. Kg Zweitaktmotor und Sandkern zur Herstellung eines Zweitaktmotors

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002242679A (ja) * 2001-02-20 2002-08-28 Zama Japan Kk 層状掃気２サイクルエンジン
DE102004037187A1 (de) 2003-09-02 2005-03-24 Andreas Stihl Ag & Co. Kg Elastischer Verbindungsstutzen
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
DE102010054840A1 (de) * 2010-12-16 2012-06-21 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
EP3026250A1 (fr) * 2014-11-28 2016-06-01 Yamabiko Corporation Unité à tube d'aspiration d'un moteur à balayage stratifié

Also Published As

Publication number Publication date
CN110836154A (zh) 2020-02-25
US10954900B2 (en) 2021-03-23
EP3611367B1 (fr) 2023-08-09
US20200056569A1 (en) 2020-02-20

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