EP3611367B1 - Elastic connecting port - Google Patents
Elastic connecting port Download PDFInfo
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 56
- 230000002093 peripheral effect Effects 0.000 claims description 40
- 239000000203 mixture Substances 0.000 claims description 23
- 238000005192 partition Methods 0.000 description 19
- 239000000446 fuel Substances 0.000 description 16
- 230000002787 reinforcement Effects 0.000 description 4
- 239000013013 elastic material Substances 0.000 description 3
- 230000002000 scavenging effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Classifications
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- 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.
Description
Die Erfindung betrifft einen elastischen Verbindungsstutzen zur Anordnung zwischen einem Verbrennungsmotor und einem Luftfilter eines handgeführten Arbeitsgeräts nach dem Oberbegriff des Anspruchs 1.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
Aus der
Die
Die
Aus der
Die
Der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Verbindungsstutzen derart weiterzubilden, dass bei guter Elastizität des Verbindungsstutzens ein einfacher Anschluss des Verbindungsstutzens auf seiner zweiten, dem Luftfilter zugeordneten Seite möglich ist.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.
Diese Aufgabe wird durch einen Verbindungsstutzen mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a connecting piece with the features of
Eine weitere Aufgabe der Erfindung besteht darin, ein handgeführtes Arbeitsgerät mit einem gattungsgemäßen Verbindungsstutzen derart weiterzubilden, dass bei guter Elastizität des Verbindungsstutzens ein einfacher Anschluss des Verbindungsstutzens mit seiner zweiten, dem Luftfilter zugeordneten Seite an ein Bauteil des Arbeitsgeräts möglich ist.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.
Diese Aufgabe wird durch ein handgeführtes Arbeitsgerät mit den Merkmalen des Anspruchs 12 gelöst.This problem is solved by a hand-held tool with the features of
Die Erfindung sieht vor, dass die erste Umfangswand und die zweite Umfangswand in einem Längsabschnitt des Verbindungsstutzens in einem Abstand zueinander angeordnet sind und dass die erste Kanalröhre und die zweite Kanalröhre auf der zweiten Seite an einem gemeinsamen Anschlussflansch münden. Im eingebauten Zustand des Verbindungsstutzens ist die erste Seite dem Verbrennungsmotor und die zweite Seite dem Luftfilter zugewandt. Zwischen dem Verbindungsstutzen und dem Luftfilter können dabei weitere Bauteile wie beispielsweise ein Vergaser angeordnet sein. Die erste Seite wird auch als Motorseite und die zweite Seite wird auch als Luftfilterseite bezeichnet.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. When the connecting piece is installed, 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.
Dadurch, dass die erste und die zweite Kanalröhre auf der zweiten Seite an einem gemeinsamen Anschlussflansch münden, ist eine einfache Anbindung der beiden Kanalröhren des Verbindungsstutzens an ein handgeführtes Arbeitsgerät möglich. Die beiden Kanalröhren müssen nicht einzeln mit dem handgeführten Arbeitsgerät verbunden werden, sondern können einfach und schnell durch Verbindung des gemeinsamen Anschlussflansches mit dem Arbeitsgerät verbunden werden. Obwohl die Kanalröhren sowohl auf der ersten Seite als auch auf der zweiten Seite in jeweils einen einzigen Flansch münden, ist die Elastizität des Verbindungsstutzens durch den Abstand der Kanalröhren in dem Längsabschnitt so groß, dass im eingebauten Zustand des Verbindungsstutzens eine Relativbewegung zwischen dem Verbrennungsmotor und dem Luftfilter des handgeführten Arbeitsgeräts möglich ist, ohne dass der Verbindungsstutzen dabei beschädigt wird.Due to the fact that the 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. Although 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.
Durch den gemeinsamen Anschlussflansch für die beiden Kanalröhren auf der Luftfilterseite des Verbindungsstutzens muss zur dichten Abbindung der beiden Kanalröhren auf der Luftfilterseite lediglich eine einzige Verbindung, nämlich die Verbindung zwischen dem gemeinsamen Anschlussflansch mit einem Bauteil des handgeführten Arbeitsgeräts abgedichtet werden. Das Bauteil des Arbeitsgeräts kann beispielsweise ein Luftfilter, ein Zwischenbauteil oder ein Vergaser sein.Due to the common connection flange for the two duct tubes on the air filter side of the connecting piece, only a single connection, namely the connection between the common connection flange and a component of the hand-held working device, has to be sealed in order to tightly bind the two duct tubes on the air filter side. The component of the working device can be, for example, an air filter, an intermediate component or a carburetor.
Zweckmäßig ist zwischen der ersten Umfangswand und der zweiten Umfangswand im Längsabschnitt des Verbindungsstutzens eine durchgehende Öffnung ausgebildet. Dadurch ergibt sich eine große Elastizität des Verbindungsstutzens.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.
Vorteilhaft erstreckt sich der Längsabschnitt, in dem die Umfangswände der Kanalröhren einen Abstand zueinander aufweisen, bis zum Motoranschlussflansch. Die beiden Kanalröhren sind über den Motoranschlussflansch miteinander verbunden.Advantageously, 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.
Die erste Kanalröhre besitzt eine in Umfangsrichtung der ersten Kanalröhre verlaufende Dehnungsfalte. Dadurch kann der Verbindungsstutzen bei Anordnung zwischen einem Verbrennungsmotor und einem Luftfilter eines handgeführten Arbeitsgeräts vergleichsweise große Relativbewegungen zwischen dem Luftfilter und dem Verbrennungsmotor zulassen und gleichzeitig dicht mit dem Luftfilter und dem Verbrennungsmotor verbunden sein. Die Dehnungsfalte erhöht die Elastizität des Verbindungsstutzens in Richtung parallel zur Anschlussfläche des Motoranschlussflansches. Durch die Dehnungsfalte ist eine Änderung der in Richtung senkrecht zu einer Anschlussfläche des Motoranschlussflansches gemessenen absoluten Länge der ersten Kanalröhre möglich.The first duct has an expansion fold running in the circumferential direction of the first duct. As a result, 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.
Zweckmäßig besitzt von den beiden Kanalröhren ausschließlich die erste Kanalröhre eine in Umfangsrichtung verlaufende Dehnungsfalte. Die zweite Kanalröhre ist für die Zufuhr von Kraftstoff/Luft-Gemisch vorgesehen. Bei Anordnung einer Dehnungsfalte in der zweiten Kanalröhre kann sich Kraftstoff in dieser Dehnungsfalte sammeln und von dort unkontrolliert in den Verbrennungsmotor gelangen. Dies ist vorteilhaft dadurch verhindert, dass ausschließlich die erste Kanalröhre die in Umfangsrichtung verlaufende Dehnungsfalte besitzt.Of the two ducts, only 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.
Zweckmäßig ist die Dehnungsfalte im Längsabschnitt angeordnet. Dadurch kann die Dehnungsfalte sich in vorteilhafter Gestaltung über den gesamten Umfang der ersten Kanalröhre erstrecken. In dem Längsabschnitt sind die Bewegungen der Kanalröhren begrenzt voneinander entkoppelt, so dass eine Längenänderung der zweiten Kanalröhre nur geringfügig durch die erste Kanalröhre beeinflusst wird und die durch die Dehnungsfalte bereitgestellte Beweglichkeit nicht durch die erste Kanalröhre eingeschränkt wird.The expansion fold is expediently arranged in the longitudinal section. As a result, the expansion fold can extend over the entire circumference of the first channel tube in an advantageous configuration. In the longitudinal section, 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.
Der in Richtung parallel zu einer Anschlussfläche des Motoranschlussflanschs ausgehend von einer Mitte der Dehnungsfalte gemessene Abstand zwischen den Umfangswänden beträgt mindestens 5% einer Höhe des Motoranschlussflansches. Dadurch kann die Elastizität des Verbindungsstutzens hinreichend groß sein.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. As a result, the elasticity of the connecting piece can be sufficiently large.
In vorteilhafter Weiterbildung der Erfindung ist eine erste Wandstärke der ersten Kanalröhre in einem ersten Bereich der Dehnungsfalte kleiner als eine zweite Wandstärke der ersten Kanalröhre in einem der Dehnungsfalte benachbarten zweiten Bereich der ersten Kanalröhre. Dadurch kann eine große Elastizität der Dehnungsfalte und damit des Verbindungsstutzens erreicht werden. Insbesondere bei geringer Temperatur ermöglicht die große Elastizität der Dehnungsfalte im Bereich der ersten Wandstärke, dass der Verbindungsstutzen bei ruckartigen Bewegungen im Bereich der ersten Wandstärke schnell nachgeben kann und in diesem Bereich schnell warm werden kann.In an advantageous development of the invention, 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. As a result, a high degree of elasticity of the expansion fold and thus of the connecting piece can be achieved. Particularly at low temperatures, the great elasticity of the expansion fold in the area of the first wall thickness allows the connecting piece to give way quickly in the event of jerky movements in the area of the first wall thickness and to quickly warm up in this area.
Zweckmäßig ist die Dehnungsfalte näher an der Motorseite angeordnet als an der Luftfilterseite.The expansion fold is expediently arranged closer to the engine side than to the air filter side.
Vorteilhaft läuft die Dehnungsfalte vollständig um die erste Kanalröhre um.Advantageously, the expansion fold runs completely around the first channel tube.
Insbesondere ragt die Dehnungsfalte in die durchgehende Öffnung.In particular, the expansion fold protrudes into the continuous opening.
In vorteilhafter Weiterbildung der Erfindung besitzt die zweite Kanalröhre einen dritten Bereich mit einer dritten Wandstärke und einen vierten Bereich mit einer vierten Wandstärke. Die dritte Wandstärke ist vorteilhaft kleiner als die vierte Wandstärke. Dadurch können die zweite Kanalröhre und damit auch der Verbindungsstutzen eine große Elastizität aufweisen. Insbesondere bei geringer Umgebungstemperatur ermöglicht die große Elastizität der zweiten Kanalröhre im Bereich der dritten Wandstärke, dass der Verbindungsstutzen bei ruckartigen Bewegungen im Bereich der dritten Wandstärke schnell nachgeben kann und in diesem Bereich warm wird.In an advantageous development of the invention, 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. As a result, the second duct tube and thus also the connecting piece can have great elasticity. Especially when the ambient temperature is low, the great elasticity of the second duct tube in the area of the third wall thickness allows the connecting piece to give way quickly in the event of jerky movements in the area of the third wall thickness and to become warm in this area.
Zweckmäßig ist der dritte Bereich der zweiten Kanalröhre in dem Längsabschnitt des Verbindungsstutzens angeordnet, in dem die erste Umfangswand und die zweite Umfangswand in einem Abstand zueinander angeordnet sind. Dadurch kann der Verbindungsstutzen insbesondere in dem Längsabschnitt eine große Elastizität aufweisen.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. As a result, the connecting piece can have great elasticity, particularly in the longitudinal section.
Vorteilhaft ist der dritte Bereich näher an der Motorseite angeordnet als an der Luftfilterseite.The third area is advantageously arranged closer to the engine side than to the air filter side.
Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnung erläutert. Es zeigen:
- Fig. 1
- eine schematische Seitenansicht eines handgeführten Arbeitsgeräts,
- Fig. 2
- eine schematische Darstellung eines Schnitts durch einen Verbrennungsmotor, einen Luftfilter, einen Vergaser und einen Verbindungsstutzen des Arbeitsgerät aus
Fig. 1 , - Fig. 3
- einen Schnitt durch den Vergaser und den Verbindungsstutzen aus
Fig. 2 , - Fig. 4
- eine perspektivische Darstellung des Verbindungsstutzens aus
Fig. 2 , - Fig. 5
- eine Seitenansicht des Verbindungsstutzens aus
Fig. 2 in Richtung des Pfeils V inFig. 6 , - Fig. 6
- einen Schnitt durch den Verbindungsstutzen aus
Fig. 2 entlang der Schnittlinie VI-VI inFig. 5 , - Fig. 7
- eine Seitenansicht des Verbindungsstutzens aus
Fig. 2 in Richtung des Pfeils VII inFig. 6 , - Fig. 8
- einen Schnitt durch den Verbindungsstutzen aus
Fig. 2 entlang der Schnittlinie VIII-VIII inFig. 5 .
- 1
- a schematic side view of a hand-held implement,
- 2
- a schematic representation of a section through an internal combustion engine, an air filter, a carburetor and a connecting piece of the implement
1 , - 3
- cut through the carburettor and the connecting
piece 2 , - 4
- a perspective view of the connecting
piece 2 , - figure 5
- a side view of the
connector 2 in the direction of the arrow V in6 , - 6
- cut through the
connector 2 along section line VI-VI infigure 5 , - 7
- a side view of the
connector 2 in the direction of arrow VII in6 , - 8
- cut through the
connector 2 along section line VIII-VIII infigure 5 .
Der Verbrennungsmotor 40 ist vorteilhaft an einem Motorgehäuse 80 des handgeführten Arbeitsgeräts 1 gehalten. Hierzu ist der Verbrennungsmotor 40 fest mit dem Motorgehäuse 80 verbunden. Es kann vorgesehen sein, dass Teile des Motorgehäuses 80 Teile des Verbrennungsmotors 40, beispielsweise ein Kurbelgehäuse des Verbrennungsmotors 40, bilden. Das handgeführte Arbeitsgerät 1 weist ein Griffgehäuse 81 mit einem Handgriff 84 auf. Am Handgriff 84 ist ein Gashebel 85 zur Betätigung des Verbrennungsmotors 40 angeordnet. Der Luftfilter 90 ist am Griffgehäuse 81 gehalten. Der Vergaser 70 ist vorteilhaft am Griffgehäuse 81 gehalten. Das Griffgehäuse 81 ist vom Motorgehäuse 80 durch einen Schwingspalt 82 getrennt. Der Schwingspalt 82 ist durch mehrere Antivibrationselemente 83 überbrückt. Die Antivibrationselemente 83 verbinden das Motorgehäuse 80 vibrationsdämpfend mit dem Griffgehäuse 81. Aufgrund der Antivibrationselemente 83 kann das Griffgehäuse 81 im Betrieb Relativbewegungen gegenüber dem Motorgehäuse 80 ausführen.The
Der Verbindungsstutzen 2 und der Vergaser 70 sind zwischen dem Luftfilter 90 und dem Verbrennungsmotor 40 angeordnet. Der Verbindungsstutzen 2 ist vorteilhaft zwischen dem Vergaser 70 und dem Verbrennungsmotor 40 angeordnet. Es kann auch vorgesehen sein, dass der Verbindungsstutzen direkt zwischen einem Luftfilter und einem Verbrennungsmotor angeordnet ist. Der Verbindungsstutzen 2 überbrückt den Schwingspalt 82 und lässt eine Relativbewegung zwischen Luftfilter 90 und Verbrennungsmotor 40 zu.The
Wie in
In das Kurbelgehäuse 46 mündet ein Gemischeinlass 58, der im gezeigten Ausführungsbeispiel vom Kolben 42 gesteuert ist. Der Gemischeinlass 58 ist im Ausführungsbeispiel an der Zylinderbohrung angeordnet und wird vom Kolbenhemd des Kolbens 42 geöffnet und geschlossen.A
Im Bereich des in
Der Verbrennungsmotor 40 ist über einen Ansaugkanal 64 mit dem Luftfilter 90 verbunden. Über den Ansaugkanal 64 saugt der Verbrennungsmotor 40 im Betrieb Luft an. Ein Abschnitt 65 des Ansaugkanals 64 ist in dem Vergaser 70 ausgebildet. Der Vergaser weist einen Abschnitt 70 auf, in dem der angesaugten Verbrennungsluft über eine Hauptkraftstofföffnung 52 und Nebenkraftstofföffnungen 54 Kraftstoff zugeführt wird. Die Hauptkraftstofföffnung 52 ist im Bereich eines Venturi 53 angeordnet. Die Nebenkraftstofföffnungen 54 sind stromab der Hauptkraftstofföffnung 52 angeordnet. Im Vergaser 70 ist ein verstellbares Drosselelement angeordnet. Im Ausführungsbeispiel ist das Drosselelement eine Drosselklappe 55, die mit einer Drosselwelle 56 schwenkbar gelagert ist.The
Der Verbrennungsmotor 40 ist im Ausführungsbeispiel als Spülvorlagen-Zweitaktmotor ausgebildet. Zur Zufuhr von Spülvorlagenluft ist der Ansaugkanal 64 stromab der Drosselklappe 55 in einen Gemischkanal und einen Luftkanal aufgeteilt. Im Vergaser 70 erfolgt die Teilung in Gemischkanal und Luftkanal durch einen Trennwandabschnitt 57, der sich parallel zur Strömungsrichtung im Ansaugkanal 64 erstreckt. Im Verbindungsstutzen 2 verläuft der Luftkanal in einer ersten Kanalröhre 10 des Verbindungsstutzens 2. Der Gemischkanal verläuft im Verbindungsstutzen 2 in einer zweiten Kanalröhre 20 des Verbindungsstutzens 2. Die erste Kanalröhre 10 mündet mit einem Lufteinlass 59 am Zylinder 41. Die zweite Kanalröhre 20 mündet mit dem Gemischeinlass 58 im Bereich des Zylinders 41 in den Innenraum des Kurbelgehäuses 46. Im Bereich des oberen Totpunkts des Kolbens 42 ist der Lufteinlass 59 über in der Mantelfläche des Kolbens 42 ausgebildete Kolbentaschen 60 mit den Überströmfenstern 49 und 50 der Überströmkanäle 47 und 48 verbunden.In the exemplary embodiment, the
Im Betrieb des Verbrennungsmotors 40 wird bei der Aufwärtsbewegung des Kolbens 42 Kraftstoff/Luft-Gemisch über die zweite Kanalröhre 20 ins Kurbelgehäuse 46 angesaugt. Im Bereich des oberen Totpunkts des Kolbens 42 wird in den Überströmkanälen 47 und 48 Spülvorlagenluft vorgelagert. Hierzu wird über die Kolbentaschen 60 aus der ersten Kanalröhre 10 weitgehend kraftstofffreie Luft über die Überströmfenster 49 und 50 in die Überströmkanäle 47 und 48 angesaugt. Bei der folgenden Abwärtsbewegung des Kolbens 42 wird das Kraftstoff/Luft-Gemisch im Kurbelgehäuse 46 verdichtet. Sobald die Überströmfenster 49 und 50 zum Brennraum 43 hin öffnen, strömt durch die Überströmkanäle 47 und 48 zunächst die vorgelagerte weitgehend kraftstofffreie Luft und anschließend Kraftstoff/Luft-Gemisch in den Brennraum 43. Bei der folgenden Aufwärtsbewegung des Kolbens 42 wird das Gemisch im Brennraum 43 verdichtet und im Bereich des oberen Totpunkts des Kolbens 42 von einer Zündkerze 61 gezündet. Vorteilhaft ragt die Zündkerze 61 in den Brennraum 43. Aufgrund der Verbrennung wird der Kolben 42 zum Kurbelgehäuse 46 hin beschleunigt. Sobald der Auslass 51 vom Kolben 42 geöffnet wird, können die Abgase aus dem Brennraum 43 entweichen. Durch die Überströmkanäle 47 und 48 strömt dann wiederum zunächst weitgehend kraftstofffreie Luft in den Brennraum 43 ein, die die aus dem Auslass 51 entweichenden Abgase vom nachströmenden Frischgemisch trennt.When the
Der Verbindungsstutzen 2 weist eine Trennwand 67 auf, die die erste Kanalröhre 10 und die zweite Kanalröhre 20 des Verbindungsstutzens 2 voneinander trennt. Die Trennwand 67 des Verbindungsstutzens 2 liegt vorteilhaft an dem Trennwandwandabschnitt 57 des Zwischenrings 71 an. Die Trennwand 67 setzt den Trennwandabschnitt 57 fort. Der Zwischenring 71 ist aus formstabilem Material, vorteilhaft aus Metall oder formstabilem Kunststoff. Der Trennwandabschnitt 57 stabilisiert und hält die Trennwand 67 vorzugsweise bei Relativbewegungen zwischen dem Motorgehäuse 81 und dem Griffgehäuse 80. Zur Verbindung der Luftkanalabschnitte des Vergasers 70 und des Verbindungsstutzens 2 und zur Verbindung der Gemischkanalabschnitte des Vergasers 70 und des Verbindungsstutzens 2 weist die Trennwand 67 des Verbindungsstutzens 2 einen Anlagevorsprung 72 auf. Der Trennwandabschnitt 57 des Zwischenrings 71 weist vorteilhaft einen Anlagevorsprung 62 auf. Der Anlagevorsprung 72 der Trennwand 67 des Verbindungsstutzens 2 und der Anlagevorsprung 62 des Trennwandabschnitts 57 des Zwischenrings 71 liegen in Längsrichtung 100 überlappend aneinander an. Damit kann ein Durchbiegen des elastischen Anlagevorsprungs 72 bei Bewegungen im Betrieb vermieden werden.The connecting
Bei einer Verbindung der zweiten Seite 4 des Verbindungsstutzens 2 mit dem Vergaser 70 durch Befestigung des Anschlussflanschs 6 am Vergaser 70 kann vorteilhaft auch gleichzeitig eine Verbindung der Luftkanalabschnitte des Vergasers 70 und des Verbindungsstutzens 2 und der Gemischkanalabschnitte des Vergasers 70 und des Verbindungsstutzens 2 hergestellt werden.When the
Wie
Stromab der Drosselklappe 55 ist im Vergaser 70 eine Chokeklappe 63 angeordnet. Zwischen der Drosselklappe 55 und der Chokeklappe 63 kann ein weiterer Trennwandabschnitt zur Trennung von Luftkanal und Gemischkanal vorgesehen sein.A
Der Verbindungsstutzen 2 lässt eine Relativbewegung des am Motorgehäuse 80 gehaltenen Verbrennungsmotors 40 und des am Griffgehäuse 81 gehaltenen Luftfilters 90 zu (
Der Verbindungsstutzen 2 weist an seiner ersten Seite 3 einen Motoranschlussflansch 5 zur Verbindung mit dem Verbrennungsmotor 40 auf. Wie in
Aus der in den
Die Anschlussfläche 9 weist vorzugsweise vier Verbindungsöffnungen 11 auf. Durch die Verbindungsöffnungen 11 kann der Verbindungsstutzen 2 mittels Schrauben am Verbrennungsmotor 40 befestigt werden. Zur Verbindung der ersten Kanalröhre 10 und der zweiten Kanalröhre 20 mit dem Verbrennungsmotor 40 muss dann lediglich der Motoranschlussflansch 5 mit dem Verbrennungsmotor 40 verbunden werden. Es ist nicht erforderlich, jede Kanalröhre 10, 20 einzeln mit dem Verbrennungsmotor 40 zu verbinden.The
Wie in
Wie in
Zur Abdichtung der Verbindung von erster Kanalröhre 10 und Vergaser 70 und der Verbindung von zweiter Kanalröhre 20 und Vergaser 70 muss lediglich eine einzige Verbindungsstelle zwischen dem Anschlussflansch 6 des Verbindungsstutzens 2 auf der zweiten Seite 4 und dem Vergaser 70 abgedichtet werden.To seal the connection between the
Ausgehend von der gemeinsamen Mündungsöffnung 7 auf der zweiten Seite 4 des Verbindungsstutzens 2 erstrecken sich die erste Kanalröhre 10 und die zweite Kanalröhre 20 bis zur Motorseite des Verbindungsstutzens 2. Wie in
Der Anschlussflansch 6 auf der zweiten Seite 4 des Verbindungsstutzens 2 weist eine Anlagefläche 69 zur Anlage an einem Bauteil des handgeführten Arbeitsgeräts 1 auf. Im Ausführungsbeispiel liegt der Verbindungsstutzen 2 mit der Anlagefläche 69 am Vergaser 70 an, wie in
Wie insbesondere in
Wie
Der Motoranschlussflansch 5 weist eine parallel zu seiner Anschlussfläche 9 in Richtung von der ersten Kanalröhre 10 zur zweiten Kanalröhre 20 gemessene Höhe h1 auf. Eine in der Mitte bezüglich der Längserstreckung des Längsabschnitts 31 in Richtung der Höhe h1 des Motoranschlussflansches 5 gemessene Höhe h2 beträgt vorteilhaft mindestens 3%, insbesondere 5% der Höhe h1 des Motoranschlussflansches 5.The
Wie in
Die Dehnungsfalte 12 erstreckt sich in Längsrichtung 100 über einen ersten Erstreckungsbereich 18. Im ersten Erstreckungsbereich 18 ist die erste Umfangswand 17 zur Bildung der Dehnungsfalte 12 nach außen gestülpt. Anfang und Ende des ersten Erstreckungsbereichs 18 sind im Ausführungsbeispiel nach
Der Längsabschnitt 31 kann bezüglich der Längsrichtung 100 näher an der ersten Seite 3 als an der zweiten Seite 4 angeordnet sein. Die Dehnungsfalte 12 ist vorteilhaft bezüglich der Längsrichtung 100 näher an der ersten Seite 3 als an der zweiten Seite 4 angeordnet. Die Mitte 16 der Dehnungsfalte 12 besitzt einen in Längsrichtung 100 gemessenen ersten größten Abstand d1 zur Anschlussfläche 9 des Motoranschlussflansches 5. Der erste größte Abstand d1 beträgt vorteilhaft weniger als 50%, insbesondere weniger als 45%, der ersten Länge 11 der ersten Kanalröhre 10.The
Die zweite Kanalröhre 20 kann einen dritten Bereich 23 mit einer dritten Wandstärke w3 aufweisen. Die zweite Kanalröhre 20 kann einen vierten Bereich mit einer vierten Wandstärke w4 aufweisen. Die dritte Wandstärke w3 ist vorteilhaft kleiner als die vierte Wandstärke w4. Der dritte Bereich 23 der zweiten Kanalröhre 20 ist bezüglich der Längsrichtung 100 in dem Längsabschnitt 31 angeordnet. Der dritte Bereich 23 der zweiten Kanalröhre 20 erstreckt sich vorzugsweise in Längsrichtung 100 über einen zweiten Erstreckungsbereich 28. Das Ende und der Anfang des zweiten Erstreckungsbereichs bezüglich der Längsrichtung 100 sind durch eine Abweichung der Wandstärke von der vierten Wandstärke w4 gekennzeichnet. Der dritte Bereich 23 läuft vorzugsweise um die zweite Kanalröhre 20 um.The
Der dritte Bereich 23 ist vorteilhaft näher an der ersten Seite 3 als an der zweiten Seite 4 angeordnet. Ein in Längsrichtung gemessener zweiter Abstand d2 zwischen Anschlussfläche 9 des Motoranschlussflansches 5 und dem dritten Bereich 23 der zweiten Kanalröhre 20 beträgt vorteilhaft weniger als ein Drittel, insbesondere weniger als ein Viertel, der zweiten Länge l2 der zweiten Kanalröhre 20.The
Wie in
Claims (12)
- Elastic connecting piece for arrangement between a combustion engine (40) and an air filter (90) of a hand-held work device (1), wherein the connecting piece (2) has a first channel tube (10) for largely fuel-free air and has a second channel tube (20) for a fuel-air mixture, wherein, on a first side (3), the connecting piece (2) has an engine-connection flange (5) for connection to the combustion engine (80), at which the first channel tube (10) and the second channel tube (20) open out, wherein the first channel tube (10) has a first peripheral wall (17), wherein the second channel tube (20) has a second peripheral wall (27), wherein, in a longitudinal portion (31) of the connecting piece (2), the first peripheral wall (17) and the second peripheral wall (27) are arranged at a distance (v, h2) from one another, wherein the channel tubes (10, 20) extend from the first side (3) to a second side (4) of the connecting piece (2), wherein a through-opening (30) is formed between the first peripheral wall (17) and the second peripheral wall (27) in the longitudinal portion (31), wherein the connecting piece (2) is of one-part form, wherein, on the second side (4), the first channel tube (10) and the second channel tube (20) open out at a common connection flange (6),
characterized in that the first channel tube (10) has an expansion fold (12) extending in a peripheral direction (101) of the first channel tube (10), and in that the distance (v) between the peripheral walls (17, 27), measured in a direction parallel to a connection surface (9) of the engine-connection flange (5) proceeding from a centre (16) of the expansion fold (12), is at least 5% of a height (h1) of the engine-connection flange (5). - Elastic connecting piece according to Claim 1,
characterized in that the longitudinal portion (31) extends as far as the engine-connection flange (5). - Elastic connecting piece according to Claim 1 or 2,
characterized in that exclusively the first channel tube (10) has the expansion fold (12) extending in a peripheral direction (101). - Elastic connecting piece according to one of Claims 1 to 3,
characterized in that the expansion fold (12) is arranged in the longitudinal portion (31). - Elastic connecting piece according to one of Claims 1 to 4,
characterized in that a first wall thickness (w1) of the first channel tube (10) in a first region (13) of the expansion fold (12) is smaller than a second wall thickness (w2) of the first channel tube (10) in a second region (14), adjacent to the expansion fold (12), of the first channel tube (10). - Elastic connecting piece according to one of Claims 1 to 5,
characterized in that the expansion fold (12) is arranged closer to the first side (3) than to the second side (4). - Elastic connecting piece according to one of Claims 1 to 6,
characterized in that the expansion fold (12) extends all the way around the first channel tube (10). - Elastic connecting piece according to one of Claims 1 to 7,
characterized in that the expansion fold (12) projects into the through-opening (30). - Elastic connecting piece according to one of Claims 1 to 8,
characterized in that the second channel tube (20) has a third region (23) with a third wall thickness (w3) and a fourth region (24) with a fourth wall thickness (w4), and in that the third wall thickness (w3) is smaller than the fourth wall thickness (w4). - Elastic connecting piece according to Claim 9,
characterized in that the third region (23) of the second channel tube (20) is arranged in the longitudinal portion (31). - Elastic connecting piece according to Claim 9 or 10,
characterized in that the third region (23) is arranged closer to the first side (3) than to the second side (4). - Hand-held work device having an elastic connecting piece (2) according to one of Claims 1 to 11, wherein the elastic connecting piece (2) is arranged between a combustion engine (80) of the work device (1) and a carburettor (70) of the work device (1).
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18189125.0A EP3611367B1 (en) | 2018-08-15 | 2018-08-15 | Elastic connecting port |
US16/541,882 US10954900B2 (en) | 2018-08-15 | 2019-08-15 | Elastic connecting support |
CN201910753460.4A CN110836154A (en) | 2018-08-15 | 2019-08-15 | Elastic connecting pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18189125.0A EP3611367B1 (en) | 2018-08-15 | 2018-08-15 | Elastic connecting port |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3611367A1 EP3611367A1 (en) | 2020-02-19 |
EP3611367B1 true EP3611367B1 (en) | 2023-08-09 |
Family
ID=63293977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18189125.0A Active EP3611367B1 (en) | 2018-08-15 | 2018-08-15 | Elastic connecting port |
Country Status (3)
Country | Link |
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US (1) | US10954900B2 (en) |
EP (1) | EP3611367B1 (en) |
CN (1) | CN110836154A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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USD907065S1 (en) * | 2019-08-09 | 2021-01-05 | Wehrli Custom Fabrication, Inc. | Adapter for installation of a turbocharger |
CN113107662A (en) * | 2021-05-08 | 2021-07-13 | 永康市茂金园林机械有限公司 | Cylinder piston unit for stratified scavenging two-stroke engine |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4203885A1 (en) | 1992-02-11 | 1993-08-12 | Stihl Maschf Andreas | HAND-HELD WORKING MACHINE LIKE MOTOR CHAINSAW, CUT-OFF GRINDERS OR THE LIKE |
SE9303470L (en) | 1993-10-21 | 1995-04-22 | Electrolux Ab | Intake pipe for an internal combustion engine |
JP2002242679A (en) * | 2001-02-20 | 2002-08-28 | Zama Japan Kk | Stratified scavenging two cycle engine |
DE10213415B4 (en) | 2002-03-26 | 2017-06-01 | Andreas Stihl Ag & Co. | connecting pieces |
DE10213414A1 (en) * | 2002-03-26 | 2003-10-09 | Stihl Maschf Andreas | Elastic connector used between a carburetor and an inlet channel in an internal combustion engine of a hand-held machine tool has a constant flow cross-section over its entire length when an extending fold is folded |
US8516989B2 (en) * | 2003-09-02 | 2013-08-27 | Andreas Stihl Ag & Co. Kg | Internal combustion engine having an elastic connecting duct |
DE20313567U1 (en) | 2003-09-02 | 2003-10-30 | Stihl Ag & Co Kg Andreas | Elastic connector |
EP1774151B1 (en) | 2004-07-09 | 2009-11-11 | Husqvarna AB | A flexible intake system for a two-stroke internal combustion engine with additional air supply, comprising a baffle to secure ducts to the cylinder wall |
DE102007037009A1 (en) * | 2006-08-09 | 2008-03-06 | Andreas Stihl Ag & Co. Kg | Heat engine for driving tool of e.g. chain saw, has part of intake duct guided in elastic inlet tube, which has separation wall extending on part of length of tube and dividing intake duct into mixture duct and inlet duct |
DE102008006681A1 (en) * | 2008-01-30 | 2009-08-06 | Andreas Stihl Ag & Co. Kg | Internal combustion engine with an elastic connecting piece and method for producing an elastic connecting piece |
DE102009059143B4 (en) | 2009-12-19 | 2020-01-23 | Andreas Stihl Ag & Co. Kg | Two-stroke engine and sand core for the production of a two-stroke engine |
DE102010054840B4 (en) | 2010-12-16 | 2020-03-26 | Andreas Stihl Ag & Co. Kg | Two-stroke engine |
DE102013012510A1 (en) * | 2013-07-27 | 2015-01-29 | Andreas Stihl Ag & Co. Kg | Hand-held implement and elastic connecting piece for a hand-held implement |
JP6432081B2 (en) * | 2014-11-28 | 2018-12-05 | 株式会社やまびこ | Stratified scavenging engine intake pipe unit |
-
2018
- 2018-08-15 EP EP18189125.0A patent/EP3611367B1/en active Active
-
2019
- 2019-08-15 CN CN201910753460.4A patent/CN110836154A/en active Pending
- 2019-08-15 US US16/541,882 patent/US10954900B2/en active Active
Also Published As
Publication number | Publication date |
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US20200056569A1 (en) | 2020-02-20 |
EP3611367A1 (en) | 2020-02-19 |
CN110836154A (en) | 2020-02-25 |
US10954900B2 (en) | 2021-03-23 |
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