EP2441945B1 - Carburettor - Google Patents

Carburettor Download PDF

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Publication number
EP2441945B1
EP2441945B1 EP11008126.2A EP11008126A EP2441945B1 EP 2441945 B1 EP2441945 B1 EP 2441945B1 EP 11008126 A EP11008126 A EP 11008126A EP 2441945 B1 EP2441945 B1 EP 2441945B1
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EP
European Patent Office
Prior art keywords
choke
throttle
coupling element
lever
coupling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP11008126.2A
Other languages
German (de)
French (fr)
Other versions
EP2441945A2 (en
EP2441945A3 (en
Inventor
Patrick Levien
Alexander Kraus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
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Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Publication of EP2441945A2 publication Critical patent/EP2441945A2/en
Publication of EP2441945A3 publication Critical patent/EP2441945A3/en
Application granted granted Critical
Publication of EP2441945B1 publication Critical patent/EP2441945B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F02M1/02—Carburettors with means for facilitating engine's starting or its idling below operational temperatures the means to facilitate starting or idling being chokes for enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1065—Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0205—Arrangements; Control features; Details thereof working on the throttle valve and another valve, e.g. choke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0296—Throttle control device with stops for limiting throttle opening or closing beyond a certain position during certain periods of operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0298—Throttle control device with holding devices, i.e. to hold throttle in a predetermined position

Definitions

  • the invention relates to a carburetor of the type specified in the preamble of claim 1.
  • the invention has for its object to provide a carburetor of the generic type, which is simple and has a small size.
  • the coupling element has a hook-shaped portion which is elastic.
  • the hook-shaped design high elasticity is achieved.
  • the hook-shaped portion also forms a favorable contour for a locking of the two coupling elements.
  • the elastic coupling element is at least partially, in particular completely made of plastic.
  • Advantageous is the plastic POM.
  • the other coupling element is advantageously dimensionally stable in the usual forces during operation. The elastic coupling element is thereby deformed by the dimensionally stable coupling element. Because one of the coupling elements is dimensionally stable, one or more detent positions can be defined comparatively precisely.
  • the first, connected to the throttle shaft coupling element is elastic and the second, connected to the choke shaft coupling element is dimensionally stable.
  • the coupling elements are in particular designed as levers.
  • the operator first gas, so must open the throttle element and then insert the choke, so the choke can pivot.
  • the first coupling element has a locking contour which cooperates with a locking portion of the second coupling element and the second coupling element blocks when the throttle element is closed and prevents rotation of the choke shaft in the opening direction.
  • a simple structure results when the hook-shaped portion forms the locking contour.
  • the coupling elements are usually subject to manufacturing tolerances.
  • a device for compensating the manufacturing tolerances is provided.
  • an intermediate lever is rotatably mounted on the choke shaft, and that the second coupling element is rotatably mounted on the choke shaft and is coupled to the intermediate lever via a coupling device.
  • the coupling device allows for a limited mobility of the second coupling element relative to the intermediate lever in at least one direction. As a result, it can be ensured, on the one hand, that a detent position between the two coupling elements is always achieved, even with unfavorable manufacturing tolerances. On the other hand, it can be ensured that the choke element is safely closed when the choke is engaged.
  • the coupling device limits the mobility of the second coupling element relative to the intermediate lever in both directions of rotation.
  • the second coupling element takes the intermediate lever with when the choke is inserted.
  • counter-rotation direction entrainment of the second coupling element via the intermediate lever is desirable in order to allow iced-away choke element or the like.
  • a simple structural design results when the coupling device is formed by a pin which projects into an opening, wherein the extent of the pin in the circumferential direction of the choke shaft is smaller than that of the opening. The game between pin and opening in the circumferential direction ensures the limited mobility of the second coupling element relative to the intermediate lever.
  • the pin is formed on the second coupling element and the opening on the intermediate lever.
  • a coupling spring is arranged in the effective direction between the second coupling element and the intermediate lever.
  • the choke element can be safely closed, in the context of the limited mobility that allows the coupling device, regardless of existing manufacturing tolerances.
  • the coupling spring secures the intermediate lever in the axial direction. As a result, an additional securing element can be omitted.
  • the intermediate lever and the second coupling element made of a dimensionally stable material, in particular made of metal or of a dimensionally stable plastic.
  • Dimensionally stable plastic as the material for the intermediate lever and / or the second coupling element is particularly advantageous in order to achieve favorable sliding pairings with other components such as, for example, a selector shaft.
  • the first coupling element is fixed to the throttle shaft via a fastening screw.
  • the fastening screw extends advantageously in an approximately radial direction to the axis of rotation of the throttle shaft.
  • Fig. 1 shows as an exemplary embodiment of a hand-held implement a power saw 1.
  • carburetor can also be used in other internal combustion engine driven hand-held implements such as cutters, brushcutters or the like.
  • the power saw 1 has a housing 2, on which a rear handle 3 and a handle tube 4 are arranged via anti-vibration elements, not shown.
  • a guide rail 5 from, on which a saw chain 6 is arranged.
  • the saw chain 6 is driven in rotation by a combustion engine 8 arranged in the housing 2.
  • the internal combustion engine 8 is advantageously a two-stroke engine, in particular a two-stroke engine operating with a scavenging charge.
  • a hand guard 7 is arranged on the housing 2.
  • the internal combustion engine 8 is connected to a carburetor 9 via an intake passage 10.
  • the internal combustion engine 8 is designed as a two-stroke engine operating with a rinsing template.
  • the intake passage 10 is divided by a partition wall 26 into an air passage 27 and a mixture passage 28.
  • a mode selector 11 is pivotally mounted on the housing 2 in the direction of arrow 12.
  • the throttle lever 13 and a throttle lock 14 are also arranged.
  • the mode selector 11 has a plurality of positions, namely a stop position, an operating position and at least one starting position.
  • the mode selector 11 acts on the carburetor 9 and an ignition switch of the engine 8. In the stop position, the ignition switch is short-circuited, so that no spark can occur.
  • FIGS. 2 to 4 show the carburetor 9 at idle.
  • the mode selector 11 is located at this position of the carburetor in the operating position, and the throttle lever 13 is not actuated by the operator.
  • the carburetor 9 has a carburetor housing 15 in which an intake passage section 16 (FIG. Fig. 4 ) is trained.
  • an intake passage section 16 (FIG. Fig. 4 ) is trained.
  • a Venturi 21 is formed, in the region of which a fuel opening 22 opens into the mixture passage 28.
  • a choke flap 17 with a choke shaft 18 and downstream of the choke 17 a throttle valve 19 with a throttle shaft 20 are pivotally mounted.
  • the Partition 26 extends in the region between throttle shaft 20 and choke shaft 18 and downstream of the throttle shaft 20.
  • the intake passage 10 has a AnsaugkanallNicolsachse 29, which is approximately perpendicular to the pivot axes of throttle shaft 20 and choke shaft 18.
  • a throttle lever 23 is rotatably mounted on the throttle shaft 20.
  • the intermediate lever 25 is rotatably mounted on the choke shaft 18.
  • the choke lever 24 is rotatably mounted relative to the choke shaft 18 and connected to the intermediate lever 25 via a coupling device 31 described in more detail below. In the in the FIGS. 2 and 3 shown idle position of the throttle lever 23 and the choke lever 24 are disengaged.
  • the operator can operate the throttle 13 and thereby pivots the throttle shaft 20, the throttle valve 19 and the throttle lever 23.
  • the throttle lever 23 can pivot freely from choke lever 24 and intermediate lever 25.
  • the mode selector 11 was pivoted from the operating position to the starting position, after the throttle lever 13 is pressed and thereby the throttle lever 23 in the in Fig. 5 shown position was brought.
  • the choke valve 17 is completely closed.
  • the throttle valve 19 is in a middle position and closes the intake passage 10 partially. In this position, the throttle lever 23 and the choke lever 24 are locked together in a locking position 42.
  • the throttle lever 23 has a hook-shaped portion 72 which is approximately L-shaped.
  • the short leg 37 of the hook-shaped portion 72 protrudes at the locking position 42 in a latching recess 36 on the circumference of the choke lever 24.
  • the throttle valve 19 is in the direction of its fully closed position, in Fig. 6 ie counterclockwise, and the choke lever 24 towards the fully open Position of the choke flap 17, in Fig. 6 clockwise, spring loaded. Due to the spring load of throttle lever 23 and choke lever 24 and throttle shaft 20 and choke shaft 18, the lever in the locking position 42 are held. As the figures show, open throttle 19 and choke 17 in the same direction, namely in the figures in a clockwise direction.
  • FIGS. 7 to 9 show the blocking position of the throttle lever 23 and choke lever 24.
  • the choke lever 24 has a locking portion 38 which is formed as the hook-shaped portion 72 facing the short leg 37 engages behind nose and hooks into the hook-shaped portion 72 and thus prevents further opening of the choke 17.
  • the choke flap 17 can only up to the in Fig. 9 shown position to be opened. In the Fig. 6 shown locking position 42 can not be achieved. Without previous operation of the throttle lever 13 so that insertion of the starting position is not possible.
  • the carburetor 9 shown has an emergency stop function.
  • the throttle lever 23 is formed elastically.
  • the throttle lever 23 is at least partially, in particular completely made of plastic, in particular POM.
  • the plastic from which the throttle lever 23 is formed is advantageously substantially dimensionally stable and elastic. After deformation, the throttle lever 23 thus returns to its original shape. If the choke lever 24 is pivoted in the direction of the arrow 30, then the detent recess 36 presses against the short leg 37 of the throttle lever 23 and deforms the hook-shaped section 72 in the direction of the arrow 39, as in FIG Fig. 10 indicated by the dot-dash line.
  • the choke lever 24 can then swing past the throttle lever 23.
  • a release of the starting position on the mode selector ie without pressing the throttle lever, possible.
  • the starting position in Fig. 6 is shown, by actuating the throttle lever 13, ie by pivoting the throttle lever 23 in Fig. 6 down, so in a clockwise direction, be solved.
  • the choke flap 17 pivots back to its fully open position due to the suspension. If the operator lets go of the throttle lever 13, the throttle valve pivots into the neutral position due to the spring force.
  • FIGS. 11 and 12 show the design of choke lever 24 and intermediate lever 25 in detail.
  • the two levers are connected to each other via a coupling device 31, which allows a limited relative movement between the two levers.
  • the two levers are also coupled in the circumferential direction to the axis of rotation 70 of the choke shaft 18 via a coupling spring 34.
  • the coupling spring 34 is mounted with a first end 73 on a laterally projecting pin 32 of the choke lever 24.
  • the pin 32 can be bent in the production of the choke lever 24 as a sheet metal bent part of the sheet and extending from the choke lever 24 in the plane of the intermediate lever 25.
  • the intermediate lever 25 has an opening 33 into which the pin 32 protrudes.
  • the extension of the pin 32 in the circumferential direction to the rotation axis 70 is greater than that of the opening 33, so that the pin 32 is held in the opening 33 with play and limited movement in both directions.
  • the choke lever 24 is supported via a spring 35 relative to the carburetor housing 15, which presses the choke lever 24 in the direction of the fully open position of the choke flap 17.
  • the coupling spring 34 is formed in the embodiment stronger than the spring 35, so has a larger spring constant. Due to the spring 35 tolerances between the throttle lever 23 and the choke lever 24 can be compensated so that a secure locking in the locking position 42 can be ensured. At the same time, the coupling spring 34 ensures that the choke flap 17 is completely closed in the locking position 42.
  • the choke lever 24 and the intermediate lever 25 are advantageously made of metal, in particular of sheet metal.
  • the opening 33 allows limited movement of the pin 32 in both directions of rotation. Because only limited relative movement is possible in both directions of rotation, the choke lever 24 can be actuated via the intermediate lever 25 in both directions.
  • the second end 74 of the coupling spring 34 is mounted on a shoulder 41.
  • the coupling spring 34 is designed so that it secures the intermediate lever 25 in the axial direction of the choke shaft 18.
  • the spring 35 is mounted on the choke element 24 on a shoulder 40, which is also in Fig. 8 is shown, and is supported with its other end opposite to the carburetor housing 15.
  • FIGS. 13 to 17 an embodiment of a carburetor 9 is shown in which a choke lever 44 is rotatably mounted on the choke shaft 18.
  • a throttle lever 43 is arranged rotationally fixed on the throttle shaft 20.
  • Identical reference signs indicate corresponding elements in all figures.
  • the throttle lever 43 is hook-shaped and has a short leg 47 which cooperates with the choke lever 44.
  • Fig. 13 the idling position is shown in which the choke lever 44 and throttle lever 43 are not in engagement with each other.
  • the leg 47 is located at a distance in a recess 45 of the choke lever 44.
  • a locking portion 48 projects into the area encompassed by the throttle lever 43 area.
  • Fig. 14 shows the carburetor 9 in the locked position.
  • the choke lever 44 has been pivoted without first pivoting the throttle lever 43.
  • the locking portion 48 abuts the hook-shaped portion of the throttle lever 43.
  • the two levers interlock and lock each other so that no further pivoting of the choke lever 44 is possible.
  • Fig. 15 shows the carburetor 9 in a Chokegna.
  • the operator first had to actuate the throttle lever 13 and thus bring the throttle lever 43 out of the swivel range of the choke lever 44.
  • the mode selector 11 could be pivoted into the choke position.
  • the leg 47 of the throttle lever 43 abuts against a contact surface 49 of the choke lever 44.
  • choke lever 44 and throttle lever 43 by a not shown latch the mode selector 11 held. From this position, the mode selector 11 can be adjusted to a starting position, the in Fig. 16 is shown.
  • the latching are solved via an emergency release, by adjusting the mode selector 11 in the idle position.
  • a detent recess 46 delimiting nose 50 pushes against the leg 47 of the throttle lever 43 and deforms it, as in Fig. 17 indicated by the arrow 52 and the dotted line.
  • the choke lever 44 is pivoted in the direction of the arrow 51.
  • the elastic deformation of the elastic, hook-shaped portion 72 of the throttle lever 43 so that a release of the latch is possible.
  • the throttle lever 43 is made of plastic, in particular POM and the choke lever 44 made of metal.
  • FIGS. 18 to 22 show a further embodiment of the carburetor 9.
  • the throttle shaft 20 is pivotable about a pivot axis 71.
  • an elastic throttle lever 53 is arranged rotationally fixed.
  • the throttle lever 53 is fixed on the throttle shaft 20 via a fastening screw 55, which extends approximately radially to the pivot axis 71.
  • a dimensionally stable choke lever 54 is fixed against rotation.
  • the Figures 18 and 19 show the arrangement in neutral position. Choke lever 54 and throttle lever 53 are not engaged in this position.
  • the throttle lever 53 has a hook-shaped portion 72 which is approximately L-shaped and whose short leg 57 can lock with the choke lever 54 to set a starting position of the throttle valve 19 and 17 choke flap.
  • a Rastverianaüng 56 is formed on the circumference of the choke lever 54.
  • the choke lever 54 also has a Bearing surface 59, at which the throttle lever 53 may abut in a Chokedian the arrangement.
  • the throttle shaft 20 has a flattening 60, which is overlapped by the throttle lever 53.
  • the throttle lever 53 has a corresponding recess, so that the throttle lever 53 is held positively on the throttle shaft 20.
  • the throttle shaft 20 in the region of the flattening 60 has a threaded bore 61, and the throttle lever 53 has an opening 62.
  • the fastening screw 55 is pushed through the opening 62 and screwed into the threaded hole 61. Thereby, the throttle lever 53 is secured on the throttle shaft 20.
  • the choke lever 54 has a locking portion 58 which projects in the idle position shown in the encompassed by the hook-shaped portion 72 portion of the throttle lever 53. If the choke lever 54 is actuated without pivoting the throttle lever 53, then the locking portion 58 hooks into the hook-shaped portion 72 and is thereby locked, so that further pivoting of the choke lever 54 is not possible.
  • the choke shaft 18 is spring-loaded by a spring 63 in the direction of the fully open position of the choke 17.
  • the extension of the choke lever 54 in the direction of the pivot axes 70 and 71 of the choke shaft 18 and throttle shaft 20 is less than that of the hook-shaped portion 72 of the throttle lever 53.
  • the throttle lever 53 is in particular complete, at least in the region of the hook-shaped portion 72 of an elastic, dimensionally stable plastic , in particular formed of POM.
  • the choke lever 54 advantageously consists of a dimensionally stable, non-elastic material such as metal in the forces occurring in normal operation. From the detent position between throttle lever 53 and choke lever 54, not shown in the figures, the choke lever 54 can thereby be returned to the idle position by elastic deformation of the throttle lever 53 via the mode selector 11 so that an emergency release is made possible.
  • the locking position in the usual operation by twisting the throttle shaft in the opening direction of the throttle element, ie by accelerating, solved.
  • the detent position is alternatively detachable by rotating the choke shaft in the opening direction of the choke element.
  • no further gas is required. Accordingly, the detent position can be released either by turning the throttle shaft in the opening direction of the throttle element or by rotating the choke shaft in the opening direction of the choke element.

Description

Die Erfindung betrifft einen Vergaser der im Oberbegriff des Anspruchs 1 angegebenen Gattung.The invention relates to a carburetor of the type specified in the preamble of claim 1.

Aus der DE 10 2009 014 362 A1 ist ein Vergaser bekannt, bei dem der Drosselhebel und der Chokehebel Startstellungen von Drosselklappe und Chokeklappe definieren. Um die Verrastung durch Verstellen des Betriebsartenstellers und nicht nur durch Gasgeben lösen zu können, ist eine axiale Verschiebung des Chokehebels auf der Chokewelle möglich.From the DE 10 2009 014 362 A1 a carburettor is known in which the throttle lever and the choke lever define starting positions of throttle and choke flap. In order to solve the locking by adjusting the Betriebsstellstellers and not only by accelerating, an axial displacement of the choke lever on the choke shaft is possible.

Der Erfindung liegt die Aufgabe zugrunde, einen Vergaser der gattungsgemäßen Art zu schaffen, der einfach aufgebaut ist und eine geringe Baugröße besitzt.The invention has for its object to provide a carburetor of the generic type, which is simple and has a small size.

Aus derFrom the US 2003/0052422 A1US 2003/0052422 A1 ist ebenfalls ein Vergaser bekannt, bei dem der Drosselhebel und der Chokehebel Startstellungen von Drosselklappe und Chokeklappe definieren. Die Verrastung kann durch Gasgeben gelöst werden.Also, a carburettor is known in which the throttle lever and the choke lever define start positions of throttle and choke valve. The locking can be solved by accelerating.

Diese Aufgabe wird durch einen Vergaser mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a gasifier with the features of claim 1.

Dadurch, dass mindestens eines der beiden Koppelelemente mindestens teilweise elastisch ausgebildet ist und sich beim Verdrehen der Chokewelle in Öffnungsrichtung, also bei einer Notentriegelung, elastisch verformt, wird kein Bauraum für eine axiale Verschiebung oder eine Kippbewegung des Koppelelements benötigt. Es ergeben sich ein einfacher Aufbau und ein geringer Bauraumbedarf.Characterized in that at least one of the two coupling elements is at least partially elastic and elastically deformed during rotation of the choke shaft in the opening direction, ie an emergency release, no space for an axial displacement or a tilting movement of the coupling element is required. This results in a simple structure and a small space requirement.

Vorteilhaft besitzt das Koppelelement einen hakenförmigen Abschnitt, der elastisch ist. Durch die hakenförmige Gestaltung wird eine hohe Elastizität erreicht. Der hakenförmige Abschnitt bildet außerdem eine günstige Kontur für eine Verrastung der beiden Koppel-elemente. Vorteilhaft besteht das elastische Koppelelement mindestens teilweise, insbesondere vollständig aus Kunststoff. Vorteilhaft ist der Kunststoff POM. Das andere Koppelelement ist vorteilhaft bei den im Betrieb üblichen Kräften formstabil. Das elastische Koppelelement wird dadurch von dem formstabilen Koppelelement verformt. Dadurch, dass eines der Koppelelemente formstabil ist, können eine oder mehrere Raststellungen vergleichsweise genau definiert werden. Vorteilhaft ist das erste, mit der Drosselwelle verbundene Koppelelement elastisch und das zweite, mit der Chokewelle verbundene Koppelelement ist formstabil. Die Koppelelemente sind insbesondere als Hebel ausgebildet.Advantageously, the coupling element has a hook-shaped portion which is elastic. The hook-shaped design high elasticity is achieved. The hook-shaped portion also forms a favorable contour for a locking of the two coupling elements. Advantageously, the elastic coupling element is at least partially, in particular completely made of plastic. Advantageous is the plastic POM. The other coupling element is advantageously dimensionally stable in the usual forces during operation. The elastic coupling element is thereby deformed by the dimensionally stable coupling element. Because one of the coupling elements is dimensionally stable, one or more detent positions can be defined comparatively precisely. Advantageously, the first, connected to the throttle shaft coupling element is elastic and the second, connected to the choke shaft coupling element is dimensionally stable. The coupling elements are in particular designed as levers.

Um zu vermeiden, dass der Bediener versehentlich eine Startstellung einstellt, ist gewünscht, dass der Bediener zuerst Gas geben, also das Drosselelement öffnen muss und anschließend den Choke einlegen, also das Chokeelement verschwenken kann. Um diese Bedienreihenfolge sicherzustellen, ist vorgesehen, dass das erste Koppelelement eine Sperrkontur besitzt, die mit einem Sperrabschnitt des zweiten Koppelelements zusammenwirkt und die bei geschlossenem Drosselelement das zweite Koppelelement sperrt und ein Verdrehen der Chokewelle in Öffnungsrichtung verhindert. Ein einfacher Aufbau ergibt sich, wenn der hakenförmige Abschnitt die Sperrkontur bildet. Dadurch kann auf einfache Weise ohne zusätzliche Bauteile eine gewünschte Bedienreihenfolge konstruktiv vorgegeben werden.To avoid that the operator accidentally sets a starting position, it is desired that the operator first gas, so must open the throttle element and then insert the choke, so the choke can pivot. In order to ensure this operating sequence, it is provided that the first coupling element has a locking contour which cooperates with a locking portion of the second coupling element and the second coupling element blocks when the throttle element is closed and prevents rotation of the choke shaft in the opening direction. A simple structure results when the hook-shaped portion forms the locking contour. As a result, a desired operating sequence can be set constructively in a simple manner without additional components.

Die Koppelelemente unterliegen üblicherweise Fertigungstoleranzen. Um dennoch eine sichere Verrastung von Chokeelement und Drosselelement sicherzustellen, ist eine Einrichtung zum Ausgleich der Fertigungstoleranzen vorgesehen. Hierzu ist vorgesehen, dass auf der Chokewelle ein Zwischenhebel drehfest angeordnet ist, und dass das zweite Koppelelement drehbar auf der Chokewelle gelagert ist und mit dem Zwischenhebel über eine Koppeleinrichtung gekoppelt ist. Die Koppeleinrichtung lässt dabei eine begrenzte Beweglichkeit des zweiten Koppelelements gegenüber dem Zwischenhebel in mindestens einer Richtung zu. Dadurch kann zum einen sichergestellt werden, dass auch bei ungünstigen Fertigungstoleranzen immer eine Raststellung zwischen den beiden Koppelelementen erreicht wird. Zum anderen kann sichergestellt werden, dass das Chokeelement bei eingelegtem Choke sicher geschlossen ist. Vorteilhaft begrenzt die Koppeleinrichtung die Beweglichkeit des zweiten Koppelelements gegenüber dem Zwischenhebel in beiden Drehrichtungen. In einer Drehrichtung nimmt das zweite Koppelelement den Zwischenhebel mit, wenn der Choke eingelegt wird. In Gegendrehrichtung ist eine Mitnahme des zweiten Koppelelements über den Zwischenhebel wünschenswert, um bei vereistem Chokeelement oder dgl. ein Losreißen des Chokes über den Zwischenhebel zu erlauben. Eine einfache konstruktive Gestaltung ergibt sich, wenn die Koppeleinrichtung durch einen Zapfen gebildet ist, der in eine Öffnung ragt, wobei die Erstreckung des Zapfens in Umfangsrichtung der Chokewelle kleiner als die der Öffnung ist. Das Spiel zwischen Zapfen und Öffnung in Umfangsrichtung gewährleistet die begrenzte Beweglichkeit des zweiten Koppelelements gegenüber dem Zwischenhebel. Vorteilhaft ist der Zapfen an dem zweiten Koppelelement und die Öffnung an dem Zwischenhebel ausgebildet. Es kann jedoch auch vorteilhaft sein, den Zapfen an dem Zwischenhebel und die Öffnung an dem zweiten Koppelelement auszubilden. Bei der Ausbildung von zweitem Koppelelement und Zwischenhebel als Metallblechteile können der Zapfen und die Öffnung bei der Herstellung auf einfache Weise durch Stanzen bzw. Biegen hergestellt werden. Vorteilhaft ist in Wirkrichtung zwischen dem zweiten Koppelelement und dem Zwischenhebel eine Koppelfeder angeordnet. Dadurch kann das Chokeelement sicher geschlossen werden, und zwar im Rahmen der begrenzten Beweglichkeit, die die Koppeleinrichtung zulässt, unabhängig von bestehenden Fertigungstoleranzen. Vorteilhaft sichert die Koppelfeder den Zwischenhebel in axialer Richtung. Dadurch kann ein zusätzliches Sicherungselement entfallen. Ein einfacher Aufbau ergibt sich, wenn der Zwischenhebel und das zweite Koppelelement aus einem formstabilen Material, insbesondere aus Metall oder aus einem formstabilen Kunststoff bestehen. Formstabiler Kunststoff als Material für den Zwischenhebel und/oder das zweite Koppelelement ist insbesondere vorteilhaft, um mit anderen Bauteilen wie beispielsweise einer Schaltwelle günstige Gleitpaarungen zu erreichen.The coupling elements are usually subject to manufacturing tolerances. In order nevertheless to ensure a secure locking of choke element and throttle element, a device for compensating the manufacturing tolerances is provided. For this purpose, it is provided that an intermediate lever is rotatably mounted on the choke shaft, and that the second coupling element is rotatably mounted on the choke shaft and is coupled to the intermediate lever via a coupling device. The coupling device allows for a limited mobility of the second coupling element relative to the intermediate lever in at least one direction. As a result, it can be ensured, on the one hand, that a detent position between the two coupling elements is always achieved, even with unfavorable manufacturing tolerances. On the other hand, it can be ensured that the choke element is safely closed when the choke is engaged. Advantageously, the coupling device limits the mobility of the second coupling element relative to the intermediate lever in both directions of rotation. In one direction of rotation, the second coupling element takes the intermediate lever with when the choke is inserted. In counter-rotation direction entrainment of the second coupling element via the intermediate lever is desirable in order to allow iced-away choke element or the like. A tearing of the choke on the intermediate lever. A simple structural design results when the coupling device is formed by a pin which projects into an opening, wherein the extent of the pin in the circumferential direction of the choke shaft is smaller than that of the opening. The game between pin and opening in the circumferential direction ensures the limited mobility of the second coupling element relative to the intermediate lever. Advantageously, the pin is formed on the second coupling element and the opening on the intermediate lever. However, it may also be advantageous to form the pin on the intermediate lever and the opening on the second coupling element. In the formation of the second coupling element and intermediate lever as sheet metal parts of the pin and the opening can be made in the production in a simple manner by punching or bending. Advantageously, a coupling spring is arranged in the effective direction between the second coupling element and the intermediate lever. As a result, the choke element can be safely closed, in the context of the limited mobility that allows the coupling device, regardless of existing manufacturing tolerances. Advantageously, the coupling spring secures the intermediate lever in the axial direction. As a result, an additional securing element can be omitted. A simple construction results when the intermediate lever and the second coupling element made of a dimensionally stable material, in particular made of metal or of a dimensionally stable plastic. Dimensionally stable plastic as the material for the intermediate lever and / or the second coupling element is particularly advantageous in order to achieve favorable sliding pairings with other components such as, for example, a selector shaft.

Vorteilhaft ist das erste Koppelelement an der Drosselwelle über eine Befestigungsschraube fixiert. Die Befestigungsschraube erstreckt sich dabei vorteilhaft in etwa radialer Richtung zur Drehachse der Drosselwelle.Advantageously, the first coupling element is fixed to the throttle shaft via a fastening screw. The fastening screw extends advantageously in an approximately radial direction to the axis of rotation of the throttle shaft.

Ein Ausführungsbeispiel der Erfindung wird im Folgenden anhand der Zeichnung erläutert. Es zeigen:

Fig. 1
eine schematische Seitenansicht einer Motorsäge,
Fig. 2
eine Seitenansicht des Vergasers in Leerlaufstellung,
Fig. 3
eine perspektivische Seitenansicht des Vergasers in der Stellung aus Fig. 2,
Fig. 4
einen Schnitt durch den Vergaser in der Stellung aus Fig. 2,
Fig. 5
den Vergaser aus Fig. 2 in Volllaststellung,
Fig. 6
den Vergaser aus Fig. 2 in Startstellung,
Fig. 7
den Vergaser aus Fig. 2 in Sperrstellung,
Fig. 8
eine perspektivische Seitenansicht des Vergasers in der Stellung aus Fig. 7,
Fig. 9
einen Schnitt durch den Vergaser in der Stellung aus Fig. 7,
Fig. 10
eine schematische Darstellung der Verformung des Drosselhebels beim Lösen der Startstellung aus Fig. 6,
Fig. 11
eine perspektivische Darstellung von Chokehebel und Zwischenhebel des Vergasers,
Fig. 12
einen Schnitt durch die Chokewelle im Bereich von Zwischenhebel und Chokehebel,
Fig. 13
eine Seitenansicht eines Ausführungsbeispiels eines Vergasers in Leerlaufstellung,
Fig. 14
den Vergaser aus Fig. 13 in Sperrstellung,
Fig. 15
den Vergaser aus Fig. 13 in Chokestellung,
Fig. 16
den Vergaser aus Fig. 13 in Startstellung,
Fig. 17
eine schematische Darstellung des Vergasers beim Lösen aus der in Fig. 16 gezeigten Startstellung,
Fig. 18 und 19
perspektivische Darstellungen eines Ausführungsbeispiels eines Vergasers in Leerlaufstellung,
Fig. 20
eine Explosionsdarstellung von Drosselhebel und Drosselwelle des Vergasers aus Fig. 19,
Fig. 21
eine vergrößerte Darstellung von Drosselhebel und Chokehebel,
Fig. 22
eine Draufsicht auf den Vergaser im Bereich von Drosselhebel und Chokehebel.
An embodiment of the invention will be explained below with reference to the drawing. Show it:
Fig. 1
a schematic side view of a power saw,
Fig. 2
a side view of the carburetor in idle position,
Fig. 3
a side perspective view of the carburetor in the off position Fig. 2 .
Fig. 4
a section through the carburetor in the off position Fig. 2 .
Fig. 5
the carburetor off Fig. 2 in full load position,
Fig. 6
the carburetor off Fig. 2 in starting position,
Fig. 7
the carburetor off Fig. 2 in locked position,
Fig. 8
a side perspective view of the carburetor in the off position Fig. 7 .
Fig. 9
a section through the carburetor in the off position Fig. 7 .
Fig. 10
a schematic representation of the deformation of the throttle lever when releasing the starting position Fig. 6 .
Fig. 11
a perspective view of choke lever and intermediate lever of the carburetor,
Fig. 12
a section through the choke shaft in the range of intermediate lever and choke lever,
Fig. 13
a side view of an embodiment of a carburetor in neutral position,
Fig. 14
the carburetor off Fig. 13 in locked position,
Fig. 15
the carburetor off Fig. 13 in a choke position,
Fig. 16
the carburetor off Fig. 13 in starting position,
Fig. 17
a schematic representation of the carburetor when releasing from the in Fig. 16 shown start position,
FIGS. 18 and 19
perspective views of an embodiment of a carburetor in idle position,
Fig. 20
an exploded view of throttle lever and throttle shaft of the carburetor off Fig. 19 .
Fig. 21
an enlarged view of throttle lever and choke lever,
Fig. 22
a plan view of the carburetor in the throttle lever and choke lever.

Fig. 1 zeigt als Ausführungsbeispiel für ein handgeführtes Arbeitsgerät eine Motorsäge 1. Der der vorliegenden Erfindung zugrunde liegende Vergaser kann jedoch auch in anderen verbrennungsmotorisch angetriebenen handgeführten Arbeitsgeräten wie Trennschleifern, Freischneidern oder dgl. zum Einsatz kommen. Fig. 1 shows as an exemplary embodiment of a hand-held implement a power saw 1. However, the present invention underlying carburetor can also be used in other internal combustion engine driven hand-held implements such as cutters, brushcutters or the like.

Die Motorsäge 1 besitzt ein Gehäuse 2, an dem ein hinterer Handgriff 3 und ein Griffrohr 4 über nicht gezeigte Antivibrationselemente angeordnet sind. An der dem hinteren Handgriff 3 abgewandt liegenden Vorderseite des Gehäuses 2 ragt eine Führungsschiene 5 nach vom, an der eine Sägekette 6 angeordnet ist. Die Sägekette 6 ist von einem in dem Gehäuse 2 angeordneten Verbrennungsmotor 8 umlaufend angetrieben. Der Verbrennungsmotor 8 ist vorteilhaft ein Zweitaktmotor, insbesondere ein mit Spülvorlage arbeitender Zweitaktmotor. An der der Sägekette 6 zugewandten Seite des Griffrohrs 4 ist ein Handschutz 7 am Gehäuse 2 angeordnet.The power saw 1 has a housing 2, on which a rear handle 3 and a handle tube 4 are arranged via anti-vibration elements, not shown. At the rear handle 3 facing away from the front of the housing 2 protrudes a guide rail 5 from, on which a saw chain 6 is arranged. The saw chain 6 is driven in rotation by a combustion engine 8 arranged in the housing 2. The internal combustion engine 8 is advantageously a two-stroke engine, in particular a two-stroke engine operating with a scavenging charge. At the saw chain 6 facing side of the handle tube 4, a hand guard 7 is arranged on the housing 2.

Der Verbrennungsmotor 8 ist über einen Ansaugkanal 10 mit einem Vergaser 9 verbunden. Im Ausführungsbeispiel ist der Verbrennungsmotor 8 als mit Spülvorlage arbeitender Zweitaktmotor ausgebildet. Der Ansaugkanal 10 ist über eine Trennwand 26 in einen Luftkanal 27 und einen Gemischkanal 28 geteilt. An der dem hinteren Handgriff 3 zugewandten Seite ist am Gehäuse 2 ein Betriebsartensteller 11 in Richtung eines Pfeils 12 schwenkbar gelagert. Am hinteren Handgriff 3 sind außerdem der Gashebel 13 sowie eine Gashebelsperre 14 angeordnet.The internal combustion engine 8 is connected to a carburetor 9 via an intake passage 10. In the exemplary embodiment, the internal combustion engine 8 is designed as a two-stroke engine operating with a rinsing template. The intake passage 10 is divided by a partition wall 26 into an air passage 27 and a mixture passage 28. At the rear handle 3 side facing a mode selector 11 is pivotally mounted on the housing 2 in the direction of arrow 12. At the rear handle 3, the throttle lever 13 and a throttle lock 14 are also arranged.

Der Betriebsartensteller 11 besitzt mehrere Stellungen, nämlich eine Stoppstellung, eine Betriebsstellung sowie mindestens eine Startstellung. Der Betriebsartensteller 11 wirkt auf den Vergaser 9 sowie einen Zündschalter des Verbrennungsmotors 8. In Stoppstellung ist der Zündschalter kurzgeschlossen, so dass kein Zündfunke entstehen kann.The mode selector 11 has a plurality of positions, namely a stop position, an operating position and at least one starting position. The mode selector 11 acts on the carburetor 9 and an ignition switch of the engine 8. In the stop position, the ignition switch is short-circuited, so that no spark can occur.

Die Figuren 2 bis 4 zeigen den Vergaser 9 im Leerlauf. Der Betriebsartensteller 11 ist bei dieser Stellung des Vergasers in Betriebsstellung angeordnet, und der Gashebel 13 ist vom Bediener nicht betätigt.The FIGS. 2 to 4 show the carburetor 9 at idle. The mode selector 11 is located at this position of the carburetor in the operating position, and the throttle lever 13 is not actuated by the operator.

Der Vergaser 9 besitzt ein Vergasergehäuse 15, in dem ein Ansaugkanalabschnitt 16 (Fig. 4) ausgebildet ist. Im Ansaugkanalabschnitt 16 ist ein Venturi 21 ausgebildet, in dessen Bereich eine Kraftstofföffnung 22 in den Gemischkanal 28 mündet. Im Ansaugkanalabschnitt 16 sind eine Chokeklappe 17 mit einer Chokewelle 18 sowie stromab der Chokeklappe 17 eine Drosselklappe 19 mit einer Drosselwelle 20 schwenkbar gelagert. Die Trennwand 26 erstreckt sich im Bereich zwischen Drosselwelle 20 und Chokewelle 18 sowie stromab der Drosselwelle 20. Der Ansaugkanal 10 besitzt eine Ansaugkanallängsachse 29, die etwa senkrecht zu den Schwenkachsen von Drosselwelle 20 und Chokewelle 18 liegt.The carburetor 9 has a carburetor housing 15 in which an intake passage section 16 (FIG. Fig. 4 ) is trained. In the intake passage section 16, a Venturi 21 is formed, in the region of which a fuel opening 22 opens into the mixture passage 28. In the intake passage 16 a choke flap 17 with a choke shaft 18 and downstream of the choke 17, a throttle valve 19 with a throttle shaft 20 are pivotally mounted. The Partition 26 extends in the region between throttle shaft 20 and choke shaft 18 and downstream of the throttle shaft 20. The intake passage 10 has a Ansaugkanallängsachse 29, which is approximately perpendicular to the pivot axes of throttle shaft 20 and choke shaft 18.

Wie die Figuren 2 und 3 zeigen, sind an der Außenseite des Vergasergehäuses 15 ein Drosselhebel 23, ein Chokehebel 24 sowie ein Zwischenhebel 25 vorgesehen. Der Drosselhebel 23 ist drehfest auf der Drosselwelle 20 angeordnet. Der Zwischenhebel 25 ist drehfest auf der Chokewelle 18 angeordnet. Der Chokehebel 24 ist gegenüber der Chokewelle 18 drehbar gelagert und mit dem Zwischenhebel 25 über eine im Folgenden noch näher beschriebene Koppeleinrichtung 31 verbunden. Bei der in den Figuren 2 und 3 gezeigten Leerlaufstellung sind der Drosselhebel 23 und der Chokehebel 24 außer Eingriff.As the FIGS. 2 and 3 show, on the outside of the carburetor body 15, a throttle lever 23, a choke lever 24 and an intermediate lever 25 are provided. The throttle lever 23 is rotatably mounted on the throttle shaft 20. The intermediate lever 25 is rotatably mounted on the choke shaft 18. The choke lever 24 is rotatably mounted relative to the choke shaft 18 and connected to the intermediate lever 25 via a coupling device 31 described in more detail below. In the in the FIGS. 2 and 3 shown idle position of the throttle lever 23 and the choke lever 24 are disengaged.

Aus der in den Figuren 2 und 3 gezeigten Leerlaufstellung kann der Bediener den Gashebel 13 betätigen und verschwenkt dadurch die Drosselwelle 20, die Drosselklappe 19 und den Drosselhebel 23. Der Drosselhebel 23 kann ungehindert von Chokehebel 24 und Zwischenhebel 25 verschwenken.From the into the FIGS. 2 and 3 shown idle position, the operator can operate the throttle 13 and thereby pivots the throttle shaft 20, the throttle valve 19 and the throttle lever 23. The throttle lever 23 can pivot freely from choke lever 24 and intermediate lever 25.

Zum Einlegen der in Fig. 6 gezeigten Startstellung wurde der Betriebsartensteller 11 aus der Betriebsstellung in die Startstellung verschwenkt, und zwar nachdem der Gashebel 13 gedrückt und dadurch der Drosselhebel 23 in die in Fig. 5 gezeigte Stellung gebracht wurde. Dadurch ist ein ungehindertes Verschwenken des Chokehebels 24 mit dem Zwischenhebel 25 in Richtung des in Fig. 5 gezeigten Pfeils 75 möglich. Bei der in Fig. 6 gezeigten Startstellung ist die Chokeklappe 17 vollständig geschlossen. Die Drosselklappe 19 befindet sich in einer mittleren Stellung und verschließt den Ansaugkanal 10 teilweise. In dieser Stellung sind der Drosselhebel 23 und der Chokehebel 24 in einer Raststellung 42 miteinander verrastet. Der Drosselhebel 23 besitzt einen hakenförmigen Abschnitt 72, der etwa L-förmig ausgebildet ist. Der kurze Schenkel 37 des hakenförmigen Abschnitts 72 ragt bei der Raststellung 42 in eine Rastvertiefung 36 am Umfang des Chokehebels 24. Die Drosselklappe 19 ist in Richtung auf ihre vollständig geschlossene Stellung, in Fig. 6 also entgegen dem Uhrzeigersinn, und der Chokehebel 24 in Richtung auf die vollständig geöffnete Stellung der Chokeklappe 17, in Fig. 6 also im Uhrzeigersinn, federbelastet. Aufgrund der Federbelastung von Drosselhebel 23 und Chokehebel 24 bzw. von Drosselwelle 20 und Chokewelle 18 werden die Hebel in der Raststellung 42 gehalten. Wie die Figuren zeigen, öffnen Drosselklappe 19 und Chokeklappe 17 gleichsinnig, nämlich in den Figuren im Uhrzeigersinn.To insert the in Fig. 6 shown start position, the mode selector 11 was pivoted from the operating position to the starting position, after the throttle lever 13 is pressed and thereby the throttle lever 23 in the in Fig. 5 shown position was brought. As a result, unhindered pivoting of the choke lever 24 with the intermediate lever 25 in the direction of in Fig. 5 shown arrow 75 possible. At the in Fig. 6 shown starting position, the choke valve 17 is completely closed. The throttle valve 19 is in a middle position and closes the intake passage 10 partially. In this position, the throttle lever 23 and the choke lever 24 are locked together in a locking position 42. The throttle lever 23 has a hook-shaped portion 72 which is approximately L-shaped. The short leg 37 of the hook-shaped portion 72 protrudes at the locking position 42 in a latching recess 36 on the circumference of the choke lever 24. The throttle valve 19 is in the direction of its fully closed position, in Fig. 6 ie counterclockwise, and the choke lever 24 towards the fully open Position of the choke flap 17, in Fig. 6 clockwise, spring loaded. Due to the spring load of throttle lever 23 and choke lever 24 and throttle shaft 20 and choke shaft 18, the lever in the locking position 42 are held. As the figures show, open throttle 19 and choke 17 in the same direction, namely in the figures in a clockwise direction.

Die Figuren 7 bis 9 zeigen die Sperrstellung von Drosselhebel 23 und Chokehebel 24. Bei der in den Figuren 7 bis 9 gezeigten Stellung wurde der Betriebsartensteller 11 aus der Leerlaufstellung (Fig. 2) verschwenkt, ohne vorher den Gashebel 13 zu betätigen und damit den Drosselhebel 23 aus dem Schwenkbereich des Chokehebels 24 zu bringen. Der Chokehebel 24 besitzt einen Sperrabschnitt 38, der als dem hakenförmigen Abschnitt 72 zugewandte, den kurzen Schenkel 37 hintergreifende Nase ausgebildet ist und der in den hakenförmigen Abschnitt 72 einhakt und so ein weiteres Öffnen der Chokeklappe 17 verhindert. Die Chokeklappe 17 kann nur bis in die in Fig. 9 gezeigte Stellung geöffnet werden. Die in Fig. 6 gezeigte Raststellung 42 kann nicht erreicht werden. Ohne vorherige Betätigung des Gashebels 13 ist damit ein Einlegen der Startstellung nicht möglich.The FIGS. 7 to 9 show the blocking position of the throttle lever 23 and choke lever 24. In the in the FIGS. 7 to 9 shown position was the mode selector 11 from the idle position ( Fig. 2 ), without first actuating the throttle lever 13 and thus bring the throttle lever 23 out of the pivoting range of the choke lever 24. The choke lever 24 has a locking portion 38 which is formed as the hook-shaped portion 72 facing the short leg 37 engages behind nose and hooks into the hook-shaped portion 72 and thus prevents further opening of the choke 17. The choke flap 17 can only up to the in Fig. 9 shown position to be opened. In the Fig. 6 shown locking position 42 can not be achieved. Without previous operation of the throttle lever 13 so that insertion of the starting position is not possible.

Der gezeigte Vergaser 9 besitzt eine Not-Aus-Funktion. Damit ist das Lösen der Raststellung 42 durch Betätigen des Betriebsartenstellers 11 und damit durch Verschwenken des Chokehebels 24 möglich. Wie in Fig. 10 angedeutet, ist der Drosselhebel 23 elastisch ausgebildet. Hierzu besteht der Drosselhebel 23 mindestens teilweise, insbesondere vollständig aus Kunststoff, insbesondere aus POM. Der Kunststoff, aus dem der Drosselhebel 23 gebildet ist, ist vorteilhaft im Wesentlichen formbeständig und elastisch. Nach einer Verformung nimmt der Drosselhebel 23 damit wieder seine ursprüngliche Form an. Wird der Chokehebel 24 in Richtung des Pfeils 30 verschwenkt, so drückt die Rastvertiefung 36 gegen den kurzen Schenkel 37 des Drosselhebels 23 und verformt den hakenförmigen Abschnitt 72 in Richtung des Pfeils 39, wie in Fig. 10 durch die strichpunktierte Linie angedeutet ist. Der Chokehebel 24 kann dann am Drosselhebel 23 vorbeischwenken. Dadurch ist ein Lösen der Startstellung über dem Betriebsartensteller, also ohne Betätigen des Gashebels, möglich.The carburetor 9 shown has an emergency stop function. Thus, the release of the detent position 42 by pressing the mode selector 11 and thus by pivoting the choke lever 24 is possible. As in Fig. 10 indicated, the throttle lever 23 is formed elastically. For this purpose, the throttle lever 23 is at least partially, in particular completely made of plastic, in particular POM. The plastic from which the throttle lever 23 is formed is advantageously substantially dimensionally stable and elastic. After deformation, the throttle lever 23 thus returns to its original shape. If the choke lever 24 is pivoted in the direction of the arrow 30, then the detent recess 36 presses against the short leg 37 of the throttle lever 23 and deforms the hook-shaped section 72 in the direction of the arrow 39, as in FIG Fig. 10 indicated by the dot-dash line. The choke lever 24 can then swing past the throttle lever 23. As a result, a release of the starting position on the mode selector, ie without pressing the throttle lever, possible.

Üblicherweise kann die Startstellung, die in Fig. 6 gezeigt ist, durch Betätigen des Gashebels 13, also durch Verschwenken des Drosselhebels 23 in Fig. 6 nach unten, also im Uhrzeigersinn, gelöst werden. Sobald die Verrastung gelöst ist, schwenkt die Chokeklappe 17 aufgrund der Federung in ihre vollständig geöffnete Stellung zurück. Lässt der Bediener den Gashebel 13 los, so schwenkt die Drosselklappe aufgrund der Federkraft in die Leerlaufstellung.Usually, the starting position, in Fig. 6 is shown, by actuating the throttle lever 13, ie by pivoting the throttle lever 23 in Fig. 6 down, so in a clockwise direction, be solved. Once the latch is released, the choke flap 17 pivots back to its fully open position due to the suspension. If the operator lets go of the throttle lever 13, the throttle valve pivots into the neutral position due to the spring force.

Die Figuren 11 und 12 zeigen die Gestaltung von Chokehebel 24 und Zwischenhebel 25 im Einzelnen. Die beiden Hebel sind über eine Koppeleinrichtung 31 miteinander verbunden, die eine begrenzte Relativbewegung zwischen den beiden Hebeln erlaubt. Die beiden Hebel sind außerdem in Umfangsrichtung zur Drehachse 70 der Chokewelle 18 über eine Koppelfeder 34 gekoppelt. Die Koppelfeder 34 ist mit einem ersten Ende 73 an einem seitlich auskragenden Zapfen 32 des Chokehebels 24 eingehängt. Der Zapfen 32 kann bei der Herstellung des Chokehebels 24 als Blechbiegeteil aus dem Blech umgebogen werden und erstreckt sich vom Chokehebel 24 in die Ebene des Zwischenhebels 25. Der Zwischenhebel 25 besitzt eine Öffnung 33, in die der Zapfen 32 ragt. Wie beispielsweise Fig. 10 zeigt, ist die Erstreckung des Zapfens 32 in Umfangsrichtung zur Drehachse 70 größer als die der Öffnung 33, so dass der Zapfen 32 in der Öffnung 33 mit Spiel gehalten und in beide Richtungen begrenzt beweglich ist. Der Chokehebel 24 stützt sich über eine Feder 35 gegenüber dem Vergasergehäuse 15 ab, die den Chokehebel 24 in Richtung auf die vollständig geöffnete Stellung der Chokeklappe 17 drückt. Die Koppelfeder 34 ist im Ausführungsbeispiel stärker ausgebildet als die Feder 35, besitzt also eine größere Federkonstante. Aufgrund der Feder 35 können Toleranzen zwischen dem Drosselhebel 23 und dem Chokehebel 24 ausgeglichen werden, so dass eine sichere Verrastung in der Raststellung 42 sichergestellt werden kann. Gleichzeitig stellt die Koppelfeder 34 sicher, dass die Chokeklappe 17 in Raststellung 42 vollständig geschlossen ist. Der Chokehebel 24 und der Zwischenhebel 25 bestehen vorteilhaft aus Metall, insbesondere aus Blech. Die Öffnung 33 lässt eine begrenzte Bewegung des Zapfens 32 in beide Drehrichtungen zu. Dadurch, dass in beiden Drehrichtungen nur eine begrenzte Relativbewegung möglich ist, kann der Chokehebel 24 über den Zwischenhebel 25 in beide Richtungen betätigt werden.The FIGS. 11 and 12 show the design of choke lever 24 and intermediate lever 25 in detail. The two levers are connected to each other via a coupling device 31, which allows a limited relative movement between the two levers. The two levers are also coupled in the circumferential direction to the axis of rotation 70 of the choke shaft 18 via a coupling spring 34. The coupling spring 34 is mounted with a first end 73 on a laterally projecting pin 32 of the choke lever 24. The pin 32 can be bent in the production of the choke lever 24 as a sheet metal bent part of the sheet and extending from the choke lever 24 in the plane of the intermediate lever 25. The intermediate lever 25 has an opening 33 into which the pin 32 protrudes. Like for example Fig. 10 shows, the extension of the pin 32 in the circumferential direction to the rotation axis 70 is greater than that of the opening 33, so that the pin 32 is held in the opening 33 with play and limited movement in both directions. The choke lever 24 is supported via a spring 35 relative to the carburetor housing 15, which presses the choke lever 24 in the direction of the fully open position of the choke flap 17. The coupling spring 34 is formed in the embodiment stronger than the spring 35, so has a larger spring constant. Due to the spring 35 tolerances between the throttle lever 23 and the choke lever 24 can be compensated so that a secure locking in the locking position 42 can be ensured. At the same time, the coupling spring 34 ensures that the choke flap 17 is completely closed in the locking position 42. The choke lever 24 and the intermediate lever 25 are advantageously made of metal, in particular of sheet metal. The opening 33 allows limited movement of the pin 32 in both directions of rotation. Because only limited relative movement is possible in both directions of rotation, the choke lever 24 can be actuated via the intermediate lever 25 in both directions.

Über den Zwischenhebel 25 ist damit sowohl ein Drehen des Chokehebels 24 zur Verrastung als auch ein Lösen der Verrastung zur Notentriegelung möglich.About the intermediate lever 25 is thus both a rotation of the choke lever 24 for latching as well as a release of the latch for emergency release possible.

Wie Fig. 11 zeigt, ist das zweite Ende 74 der Koppelfeder 34 an einem Absatz 41 eingehängt. Die Koppelfeder 34 ist dabei so ausgebildet, dass sie den Zwischenhebel 25 auch in axialer Richtung der Chokewelle 18 sichert. Die Feder 35 ist am Chokeelement 24 an einem Absatz 40 eingehängt, der auch in Fig. 8 gezeigt ist, und stützt sich mit ihrem anderen Ende gegenüber dem Vergasergehäuse 15 ab.As Fig. 11 shows, the second end 74 of the coupling spring 34 is mounted on a shoulder 41. The coupling spring 34 is designed so that it secures the intermediate lever 25 in the axial direction of the choke shaft 18. The spring 35 is mounted on the choke element 24 on a shoulder 40, which is also in Fig. 8 is shown, and is supported with its other end opposite to the carburetor housing 15.

In den Figuren 13 bis 17 ist ein Ausführungsbeispiel eines Vergasers 9 gezeigt, bei dem ein Chokehebel 44 drehfest auf der Chokewelle 18 angeordnet ist. Ein Drosselhebel 43 ist auf der Drosselwelle 20 drehfest angeordnet. Gleiche Bezugszeichen kennzeichnen dabei in allen Figuren einander entsprechende Elemente. Der Drosselhebel 43 ist hakenförmig ausgebildet und besitzt einen kurzen Schenkel 47, der mit dem Chokehebel 44 zusammenwirkt. In Fig. 13 ist die Leerlaufstellung gezeigt, bei der Chokehebel 44 und Drosselhebel 43 nicht in Eingriff miteinander sind. Der Schenkel 47 liegt mit Abstand in einer Aussparung 45 des Chokehebels 44. Ein Sperrabschnitt 48 ragt in den von dem Drosselhebel 43 umgriffenen Bereich.In the FIGS. 13 to 17 an embodiment of a carburetor 9 is shown in which a choke lever 44 is rotatably mounted on the choke shaft 18. A throttle lever 43 is arranged rotationally fixed on the throttle shaft 20. Identical reference signs indicate corresponding elements in all figures. The throttle lever 43 is hook-shaped and has a short leg 47 which cooperates with the choke lever 44. In Fig. 13 the idling position is shown in which the choke lever 44 and throttle lever 43 are not in engagement with each other. The leg 47 is located at a distance in a recess 45 of the choke lever 44. A locking portion 48 projects into the area encompassed by the throttle lever 43 area.

Fig. 14 zeigt den Vergaser 9 in Sperrstellung. Der Chokehebel 44 wurde verschwenkt, ohne vorher den Drosselhebel 43 zu verschwenken. Der Sperrabschnitt 48 liegt am hakenförmigen Abschnitt des Drosselhebels 43 an. Die beiden Hebel greifen ineinander und sperren sich so gegenseitig, so dass kein weiteres Verschwenken des Chokehebels 44 möglich ist. Fig. 14 shows the carburetor 9 in the locked position. The choke lever 44 has been pivoted without first pivoting the throttle lever 43. The locking portion 48 abuts the hook-shaped portion of the throttle lever 43. The two levers interlock and lock each other so that no further pivoting of the choke lever 44 is possible.

Fig. 15 zeigt den Vergaser 9 in einer Chokestellung. Um in diese Stellung zu gelangen, musste der Bediener zunächst den Gashebel 13 betätigen und so den Drosselhebel 43 aus dem Schwenkbereich des Chokehebels 44 bringen. Anschließend konnte der Betriebsartensteller 11 in die Chokestellung verschwenkt werden. In dieser Stellung liegt der Schenkel 47 des Drosselhebels 43 an einer Anlagefläche 49 des Chokehebels 44 an. In dieser Stellung werden Chokehebel 44 und Drosselhebel 43 durch eine nicht gezeigte Verrastung des Betriebsartenstellers 11 gehalten. Aus dieser Stellung kann der Betriebsartensteller 11 in eine Startstellung verstellt werden, die in Fig. 16 gezeigt ist. Bei der Verstellung aus der Chokestellung in die Startstellung gleitet der Schenkel 47 an der Anlagefläche 49 an, bis er in einer Rastvertiefung 46 des Chokehebels 44 zu liegen kommt. In der Rastvertiefung 46 blockieren sich Drosselhebel 43 und Chokehebel 44 gegenseitig, da beide Hebel in Gegenrichtung zueinander federbelastet sind. Zum Lösen der Startstellung kann der Gashebel 13 betätigt und dadurch der Drosselhebel 43 in Fig. 16 im Uhrzeigersinn verschwenkt werden. Dadurch gelangt der Schenkel 47 aus dem Bereich der Rastvertiefung 46, und der Chokehebel 44 wird von der in Fig. 16 nicht gezeigten Feder der Chokewelle 18 in die vollständig geöffnete Stellung zurückgestellt. Alternativ kann, wie in Fig. 17 gezeigt, die Verrastung über eine Notentriegelung gelöst werden, und zwar durch Verstellen des Betriebsartenstellers 11 in die Leerlaufstellung. Dabei drückt eine die Rastvertiefung 46 begrenzende Nase 50 gegen den Schenkel 47 des Drosselhebels 43 und verformt diesen, wie in Fig. 17 durch den Pfeil 52 und die strichpunktierte Linie angedeutet ist. Der Chokehebel 44 wird dabei in Richtung des Pfeils 51 verschwenkt. Durch die elastische Verformung des elastischen, hakenförmigen Abschnitts 72 des Drosselhebels 43 ist damit ein Lösen der Verrastung möglich. Auch der Drosselhebel 43 besteht aus Kunststoff, insbesondere aus POM und der Chokehebel 44 aus Metall. Fig. 15 shows the carburetor 9 in a Chokestellung. In order to reach this position, the operator first had to actuate the throttle lever 13 and thus bring the throttle lever 43 out of the swivel range of the choke lever 44. Subsequently, the mode selector 11 could be pivoted into the choke position. In this position, the leg 47 of the throttle lever 43 abuts against a contact surface 49 of the choke lever 44. In this position, choke lever 44 and throttle lever 43 by a not shown latch the mode selector 11 held. From this position, the mode selector 11 can be adjusted to a starting position, the in Fig. 16 is shown. When adjusting from the Chokestellung to the starting position of the leg 47 slides on the contact surface 49 until it comes to rest in a detent recess 46 of the choke lever 44. Throttle lever 43 and choke lever 44 mutually block each other in detent recess 46, since both levers are spring-loaded in the opposite direction to one another. To release the starting position of the throttle lever 13 is actuated and thereby the throttle lever 43 in Fig. 16 to be pivoted clockwise. As a result, the leg 47 passes from the region of the detent recess 46, and the choke lever 44 is of the in Fig. 16 not shown spring of the choke shaft 18 is returned to the fully open position. Alternatively, as in Fig. 17 shown, the latching are solved via an emergency release, by adjusting the mode selector 11 in the idle position. In this case, a detent recess 46 delimiting nose 50 pushes against the leg 47 of the throttle lever 43 and deforms it, as in Fig. 17 indicated by the arrow 52 and the dotted line. The choke lever 44 is pivoted in the direction of the arrow 51. The elastic deformation of the elastic, hook-shaped portion 72 of the throttle lever 43 so that a release of the latch is possible. Also, the throttle lever 43 is made of plastic, in particular POM and the choke lever 44 made of metal.

Die Figuren 18 bis 22 zeigen ein weiteres Ausführungsbeispiel des Vergasers 9. Die Drosselwelle 20 ist um eine Schwenkachse 71 schwenkbar. An der Drosselwelle 20 ist ein elastischer Drosselhebel 53 drehfest angeordnet. Der Drosselhebel 53 ist auf der Drosselwelle 20 über eine Befestigungsschraube 55 fixiert, die sich etwa radial zur Schwenkachse 71 erstreckt. Auf der Chokewelle 18 ist ein formstabiler Chokehebel 54 drehfest fixiert. Auf den Chokehebel 54 wirkt der in Fig. 18 schematisch gezeigte Betriebsartensteller 11. Die Figuren 18 und 19 zeigen die Anordnung in Leerlaufstellung. Chokehebel 54 und Drosselhebel 53 sind bei dieser Stellung nicht miteinander in Eingriff. Der Drosselhebel 53 besitzt einen hakenförmigen Abschnitt 72, der etwa L-förmig ausgebildet ist und dessen kurzer Schenkel 57 mit dem Chokehebel 54 verrasten kann, um eine Startstellung von Drosselklappe 19 und Chokeklappe 17 einzustellen. Hierzu ist am Umfang des Chokehebels 54 eine Rastvertiefüng 56 ausgebildet. Der Chokehebel 54 besitzt außerdem eine Anlagefläche 59, an der der Drosselhebel 53 in einer Chokestellung der Anordnung anliegen kann.The FIGS. 18 to 22 show a further embodiment of the carburetor 9. The throttle shaft 20 is pivotable about a pivot axis 71. On the throttle shaft 20, an elastic throttle lever 53 is arranged rotationally fixed. The throttle lever 53 is fixed on the throttle shaft 20 via a fastening screw 55, which extends approximately radially to the pivot axis 71. On the choke shaft 18, a dimensionally stable choke lever 54 is fixed against rotation. On the choke lever 54 of acts in Fig. 18 schematically shown mode selector 11. The Figures 18 and 19 show the arrangement in neutral position. Choke lever 54 and throttle lever 53 are not engaged in this position. The throttle lever 53 has a hook-shaped portion 72 which is approximately L-shaped and whose short leg 57 can lock with the choke lever 54 to set a starting position of the throttle valve 19 and 17 choke flap. For this purpose, a Rastvertiefüng 56 is formed on the circumference of the choke lever 54. The choke lever 54 also has a Bearing surface 59, at which the throttle lever 53 may abut in a Chokestellung the arrangement.

Wie Fig. 20 zeigt, besitzt die Drosselwelle 20 eine Abflachung 60, die vom Drosselhebel 53 übergriffen ist. Der Drosselhebel 53 besitzt eine entsprechende Aussparung, so dass der Drosselhebel 53 formschlüssig auf der Drosselwelle 20 gehalten ist. Zur Fixierung besitzt die Drosselwelle 20 im Bereich der Abflachung 60 eine Gewindebohrung 61, und der Drosselhebel 53 besitzt eine Öffnung 62. Die Befestigungsschraube 55 ist durch die Öffnung 62 geschoben und in die Gewindebohrung 61 eingeschraubt. Dadurch ist der Drosselhebel 53 auf der Drosselwelle 20 gesichert.As Fig. 20 shows, the throttle shaft 20 has a flattening 60, which is overlapped by the throttle lever 53. The throttle lever 53 has a corresponding recess, so that the throttle lever 53 is held positively on the throttle shaft 20. For fixing, the throttle shaft 20 in the region of the flattening 60 has a threaded bore 61, and the throttle lever 53 has an opening 62. The fastening screw 55 is pushed through the opening 62 and screwed into the threaded hole 61. Thereby, the throttle lever 53 is secured on the throttle shaft 20.

Wie Fig. 21 zeigt, besitzt der Chokehebel 54 einen Sperrabschnitt 58, der in der gezeigten Leerlaufstellung in den vom hakenförmigen Abschnitt 72 umgriffenen Bereich des Drosselhebels 53 ragt. Wird der Chokehebel 54 ohne Verschwenken des Drosselhebels 53 betätigt, so hakt der Sperrabschnitt 58 in den hakenförmigen Abschnitt 72 ein und wird dadurch gesperrt, so dass ein weiteres Verschwenken des Chokehebels 54 nicht möglich ist.As Fig. 21 shows, the choke lever 54 has a locking portion 58 which projects in the idle position shown in the encompassed by the hook-shaped portion 72 portion of the throttle lever 53. If the choke lever 54 is actuated without pivoting the throttle lever 53, then the locking portion 58 hooks into the hook-shaped portion 72 and is thereby locked, so that further pivoting of the choke lever 54 is not possible.

Wie Fig. 22 zeigt, ist die Chokewelle 18 von einer Feder 63 in Richtung auf die vollständig geöffnete Stellung der Chokeklappe 17 federbelastet. Die Erstreckung des Chokehebels 54 in Richtung der Schwenkachsen 70 und 71 von Chokewelle 18 und Drosselwelle 20 ist geringer als die des hakenförmigen Abschnitts 72 des Drosselhebels 53. Der Drosselhebel 53 ist insbesondere vollständig, mindestens im Bereich des hakenförmigen Abschnitts 72 aus einem elastischen, formbeständigen Kunststoff, insbesondere aus POM ausgebildet. Der Chokehebel 54 besteht vorteilhaft aus einem formstabilen, bei den im üblichen Betrieb auftretenden Kräften nicht elastischen Material wie Metall. Aus der in den Figuren nicht gezeigten Raststellung zwischen Drosselhebel 53 und Chokehebel 54 kann der Chokehebel 54 dadurch durch elastische Verformung des Drosselhebels 53 über den Betriebsartensteller 11 in die Leerlaufstellung zurückgestellt werden, so dass eine Notentriegelung ermöglicht ist.As Fig. 22 shows, the choke shaft 18 is spring-loaded by a spring 63 in the direction of the fully open position of the choke 17. The extension of the choke lever 54 in the direction of the pivot axes 70 and 71 of the choke shaft 18 and throttle shaft 20 is less than that of the hook-shaped portion 72 of the throttle lever 53. The throttle lever 53 is in particular complete, at least in the region of the hook-shaped portion 72 of an elastic, dimensionally stable plastic , in particular formed of POM. The choke lever 54 advantageously consists of a dimensionally stable, non-elastic material such as metal in the forces occurring in normal operation. From the detent position between throttle lever 53 and choke lever 54, not shown in the figures, the choke lever 54 can thereby be returned to the idle position by elastic deformation of the throttle lever 53 via the mode selector 11 so that an emergency release is made possible.

Bei allen Ausführungsbeispielen wird die Raststellung im üblichen Betrieb durch Verdrehen der Drosselwelle in Öffnungsrichtung des Drosselelements, also durch Gasgeben, gelöst. Die Raststellung ist alternativ durch Verdrehen der Chokewelle in Öffnungsrichtung des Chokeelements lösbar. Beim Lösen der Raststellung durch Verdrehen der Chokewelle in Öffnungsrichtung ist kein weiteres Gasgeben erforderlich. Die Raststellung ist demnach entweder durch Verdrehen der Drosselwelle in Öffnungsrichtung des Drosselelements oder durch Verdrehen der Chokewelle in Öffnungsrichtung des Chokeelements lösbar.In all embodiments, the locking position in the usual operation by twisting the throttle shaft in the opening direction of the throttle element, ie by accelerating, solved. The detent position is alternatively detachable by rotating the choke shaft in the opening direction of the choke element. When releasing the locking position by rotating the choke shaft in the opening direction no further gas is required. Accordingly, the detent position can be released either by turning the throttle shaft in the opening direction of the throttle element or by rotating the choke shaft in the opening direction of the choke element.

Claims (16)

  1. Carburettor having a throttle element mounted so as to rotate with a throttle shaft (20) and having a choke element mounted so as to rotate with a choke shaft (18), having a first coupling element connected in a rotationally fixed manner to the throttle shaft (20) and having a second coupling element connected to the choke shaft (18), wherein
    - the first coupling element and the second coupling element define in at least one engagement position (42) a start position of the throttle element and choke element,
    - the engagement position (42) can be released by rotating the throttle shaft (20) in the opening direction of the throttle element,
    - the engagement position can be released by rotating the choke shaft (18) in the opening direction of the choke element,
    characterised in that
    - one of the two coupling elements is formed at least partially elastically,
    - upon rotation of the choke shaft (18) out of the engagement position in the opening direction the elastic coupling element is elastically deformed and the engagement position between the coupling elements is thereby released.
  2. Carburettor according to claim 1,
    characterised in that the elastic coupling element has a hook-shaped portion (72) which is elastic.
  3. Carburettor according to claim 1 or 2,
    characterised in that the elastic coupling element is made of plastic.
  4. Carburettor according to one of the claims 1 to 3,
    characterised in that the other coupling element is dimensionally stable under the usual forces during operation.
  5. Carburettor according to claim 4,
    characterised in that the first coupling element is elastic and the second coupling element is dimensionally stable.
  6. Carburettor according to one of the claims 2 to 5,
    characterised in that the first coupling element has a locking contour which interacts with a locking portion (38, 48, 58) of the second coupling element and which locks the second coupling element when the throttle element is closed and prevents rotation of the choke shaft (18) in the opening direction.
  7. Carburettor according to claim 6,
    characterised in that the hook-shaped portion (72) forms the locking contour.
  8. Carburettor according to one of the claims 1 to 7,
    characterised in that an intermediate lever (25) is arranged in a rotationally fixed manner on the choke shaft (18), and the second coupling element is rotationally mounted on the choke shaft (18) and is coupled to the intermediate lever (25) via a coupling means (31), wherein the coupling means (31) allows a limited mobility of the second coupling element with respect to the intermediate lever (25) in at least one direction.
  9. Carburettor according to claim 8,
    characterised in that the coupling means (31) limits the mobility of the second coupling element with respect to the intermediate lever (25) in both rotation directions.
  10. Carburettor according to claim 8 or 9,
    characterised in that the coupling means (31) is formed by a pin (32) which projects into an opening (33), wherein the extension of the pin (32) in the circumferential direction of the choke shaft (18) is smaller than that of the opening (33).
  11. Carburettor according to claim 10,
    characterised in that the pin (32) is formed on the second coupling element and the opening (33) is formed on the intermediate lever (25).
  12. Carburettor according to one of the claims 8 to 11,
    characterised in that a coupling spring (34) is arranged in the operating direction between the second coupling element and the intermediate lever (25).
  13. Carburettor according to claim 12,
    characterised in that the coupling spring (34) secures the intermediate lever (25) in the axial direction of the choke shaft (18).
  14. Carburettor according to one of the claims 8 to 13,
    characterised in that the intermediate lever (25) and the second coupling element are made of a dimensionally stable material.
  15. Carburettor according to one of the claims 1 to 14,
    characterised in that the first coupling element is fixed to the throttle shaft (20) via a fixing screw (55).
  16. Carburettor according to one of the claims 1 to 15,
    characterised in that the throttle element and choke element open in the same rotation direction.
EP11008126.2A 2010-10-16 2011-10-07 Carburettor Active EP2441945B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010048773A DE102010048773A1 (en) 2010-10-16 2010-10-16 carburettor

Publications (3)

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EP2441945A2 EP2441945A2 (en) 2012-04-18
EP2441945A3 EP2441945A3 (en) 2012-11-07
EP2441945B1 true EP2441945B1 (en) 2014-08-27

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US (1) US8561971B2 (en)
EP (1) EP2441945B1 (en)
JP (1) JP5814736B2 (en)
CN (1) CN102454506B (en)
DE (1) DE102010048773A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013009668B4 (en) * 2013-06-08 2022-01-05 Andreas Stihl Ag & Co. Kg Internal combustion engine with a starting device
JP6437864B2 (en) * 2015-03-24 2018-12-12 株式会社ケーヒン Intake flow control device
CN107687378B (en) * 2016-08-03 2021-03-09 华益机电有限公司 Fuel supply system of general gasoline engine
CN108798936A (en) * 2018-05-09 2018-11-13 薛美英 The air throttle and choke of diaphragm type carburator control linkage mechanism

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Publication number Publication date
US20120091599A1 (en) 2012-04-19
CN102454506A (en) 2012-05-16
US8561971B2 (en) 2013-10-22
DE102010048773A1 (en) 2012-04-19
CN102454506B (en) 2015-07-08
EP2441945A2 (en) 2012-04-18
JP5814736B2 (en) 2015-11-17
EP2441945A3 (en) 2012-11-07
JP2012087791A (en) 2012-05-10

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