EP2230395B1 - Carburettor for a combustion engine - Google Patents
Carburettor for a combustion engine Download PDFInfo
- Publication number
- EP2230395B1 EP2230395B1 EP10002100.5A EP10002100A EP2230395B1 EP 2230395 B1 EP2230395 B1 EP 2230395B1 EP 10002100 A EP10002100 A EP 10002100A EP 2230395 B1 EP2230395 B1 EP 2230395B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- choke
- adjusting lever
- lever
- shaft
- carburettor
- 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.)
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Links
- 238000002485 combustion reaction Methods 0.000 title claims description 6
- 238000002360 preparation method Methods 0.000 claims description 7
- 230000003213 activating effect Effects 0.000 claims 1
- 230000004913 activation Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 9
- 230000007935 neutral effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003993 interaction Effects 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
- 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
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- 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
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- 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
Definitions
- the invention relates to a carburetor for an internal combustion engine referred to in the preamble of claim 1 genus.
- the DE 200 09 208 U1 describes a carburetor for an internal combustion engine of a motorized hand tool.
- the carburetor includes a throttle and a choke flap.
- To set the throttle and the choke valve in dependence on each other in several predetermined operating positions such as idle, cold start and warm start is a switch that is located directly on the carburetor and connected to the choke valve.
- the choke flap and the throttle flap are mechanically coupled to one another such that the switch assumes a different position in each operating position.
- a carburetor for small internal combustion engines comprising a throttle valve and a choke flap, wherein biasing means are provided, which the Choke the throttle valve and the choke flap in the direction of defined positions. It is provided a latching connection between the two flaps, which holds the two flaps against the biasing means in their starting positions.
- the latching connection can be released by a movement of the throttle valve from its starting position and has a choke lever and an associated intermediate lever, which are engageable with each other in latching engagement. The lock is released when an operator operates a throttle to accelerate the engine because it causes the throttle lever to pivot and release the intermediate lever.
- the EP 1 092 860 A2 shows a carburetor with a lever assembly consisting of a throttle lever and a Chokestellhebel.
- the levers lock together in a starting position.
- the choke lever can slide past the throttle lever against a spring force.
- the operator must accelerate.
- the US 3,305,223 shows a lever assembly for controlling a carburetor.
- the lever assembly includes a lever member which is connected via a spring to the throttle and a lever arm for a controller. About a finger arranged on the lever element, the position of the choke flap is adjustable.
- the DE 100 06 947 A1 shows a carburetor, in which cooperates in start position, the idle lever with the throttle lever.
- the present invention has for its object to provide a carburetor referred to in the preamble of claim 1 genus in which an operating switch for different operating positions also includes an emergency stop position, and the emergency release the latch between the throttle lever and the Chokestellhebel is released.
- the Chokestellhebel is rotatably connected to the choke shaft and the spring loads the choke additionally in the direction of an open position.
- the device on the choke shaft is preferably mounted limited movable relative to the Chokestellhebel. In this way, the choke flap can be brought into its open position, although the operating switch remains in its "emergency stop" position.
- the unlocking device displaces the Chokestellhebel axially against the force of a spring on the choke shaft or the Chokestellhebel is tiltably mounted on the choke shaft, and the device is formed by an actuating rod which generates the tilting movement. Moves the device for unlocking the Chokestellhebel against the force of a spring axially on the choke shaft, the Chokestellhebel passes through this movement of the Chokestellhebels in another plane relative to the throttle lever, so that the locking is released.
- this Chokestellhebel tiltably mounted on the choke shaft, and the device is formed by an actuating rod which generates the tilting movement, so this Chokestellhebel is preferably mounted on a protruding through the choke shaft cross pin.
- an elongated opening is provided in the one End of the choke shaft protrudes and between the contour of the opening and the end of the choke shaft is given a distance that allows a defined tilt angle.
- the unlocking device suitably comprises a choke control lever which can be mechanically coupled to the choke lever.
- the choke control lever is fixed on the choke shaft, but freely rotatable with respect to this at least in one direction.
- This choke control lever comprises at least one driver, which engages in a recess of the Chokestellhebels. The driver is designed so that the choke control lever acts on the choke lever when the choke flap is to be closed.
- the Chokeberichthebel comprises at least one ramp which cooperates with the Chokestellhebel in the axial direction. It is also advantageous that two drivers are arranged on the Chokeêthebel, preferably diametrically relative to the choke shaft and at each of the drivers a ramp is formed. In this way, the forces can be divided evenly and jamming of the choke control lever is avoided. In order to reduce the actuating forces, it is expedient that inclined surfaces are formed on the Chokestellhebel having the same angle of inclination, as the ramps. It is also appropriate that on the Chokestellhebel a projection is provided which serves as a stop for the driver in the closing direction of the choke flap.
- the Fig. 1 shows a carburetor 1 for an internal combustion engine, for example, in a working device, a carburetor housing 2 with a running therein mixture preparation channel 3 and a throttle valve 4 and a - in Fig. 1 invisible - includes choke flap.
- the throttle valve 4 is fixed to a rotatably mounted throttle shaft 5, which is provided at an end protruding from the housing 2 with an actuating lever 6 and at the other of the housing 2 projecting end with a throttle lever 7.
- a throttle linkage or a throttle cable is articulated to adjust the throttle valve 4 by turning the throttle shaft 5. This rotational movement also performs the non-rotatably mounted on the throttle shaft 5 Gasstellhebel 7.
- a choke shaft 8 is arranged in the carburetor housing 2, on which the in Fig. 1 invisible choke flap is attached.
- a Chokestellhebel 9 is arranged, which is non-rotatably mounted on the choke shaft 8, but axially displaceable.
- a choke control lever 10 is disposed which is rotatable relative to the choke shaft 8 and the choke lever 9.
- the choke control lever 10 has an opening 11 into which engages a control rod driven by an operating switch.
- the Chokeêthebel 10 has two parallel to the choke shaft 8 extending driver 12, which engage in recesses 13 of the Chokestellhebels 9.
- Fig. 2 the carburetor 1 is shown in a view of the lever assembly for the throttle and the choke flap in a stop position. Behind the carburetor housing 2 is on the left side of the actuating lever 6 protrudes. On the end the throttle valve shaft 5 is seated, the throttle lever 7, which comprises a parallel to a tangent of the throttle shaft 5 extending arm 14 and a right angle to the Chokestellhebel 9 bent leg 15. In this stop position, the leg 15 engages in a recess 16 at the edge of the Chokestellhebels 9. In this position of the Chokestellhebels 9 is on the right side of the carburetor housing from the mixture preparation channel outstanding Choke flap 22 in the fully open position.
- the Choke tenuhebel 10 engages with its drivers 12 in the recesses 13 of the Chokestellhebels 9, and thereby lie the driver 12 at edges 28 of the Chokestellhebels 9.
- the positions of the throttle lever 7 and the Chokestellhebels 9 in Fig. 2 are taken due to the return springs acting on these levers.
- the position of the choke control lever 10 is determined by the already mentioned control rod or the operating switch of the implement.
- the Fig. 3 shows an enlarged view of a section of the carburetor 1 substantially in the direction of arrow III in Fig. 2 , From the carburetor housing 2, the throttle shaft 5 protrudes, on the end of the throttle lever 7 is fixed. In addition, the protruding from the carburetor housing 2 choke shaft 8 can be seen, on which the Chokestellhebel 9 and the Chokematihebel 10 are attached. Concentric with the choke shaft 8, a coil spring 17 is arranged, one end of which has a leg 18 which engages behind the throttle shaft 5 and the other end is bent to a hook 19 which is hooked to a projection 9 'of the throttle lever 9.
- the coil spring 17 has thus, the function, the Chokestellhebel 9 and thus also the choke valve due to the position in which it completely opens the mixture preparation channel.
- the coil spring 17 acts as a compression spring, since it is supported on the one hand on the carburetor housing 2 and on the other hand on the Chokestellhebel 9 and thus presses the Chokestellhebel 9 against the Choke tenuhebel 10.
- the driver 12 on Choke tenuhebel 10 project into the recesses 13 of the Chokestellhebels 9, wherein Fig. 3 it can be seen that the driver 12 has on one side a ramp 20 which rests against an inclined surface 27 of the edge 28.
- the driver 12 has a contour 26 extending at right angles to the choker lever 9. With this design, it is possible for the ramp 20 to slide on the inclined surface 27 in the clockwise direction of rotation of the choke control lever 10, thereby displacing the throttle lever 9 against the force of the helical spring 17 presses down, ie in the axial direction of the choke valve shaft. 8
- the driver 12 lies with its contour 26 to the projection 9 'and tows in this way the Chokestellhebel 9, whereby the choke valve is adjusted, in the sense of closing the mixture processing channel.
- the in Fig. 3 not visible other driver of the choke control lever 10 is also designed, this also applies to the other inclined surface 27 on the Chokestellhebel. 9
- the Fig. 4 shows a view of the carburetor 1 according to Fig. 2 and the Fig. 5 shows a view according to Fig. 3 , each with the lever assembly in neutral position.
- This neutral position differs from that in the Figures 2 and 3 shown start position by the changed position of the Choke Kunststoffhebels 10, because this is now with the contour 26 of its driver 12 at corresponding radial projections 9 ', 91' of the Chokestellhebels 9.
- the ignition of the engine is turned on.
- Fig. 5 it is clear that the throttle lever 7 and the Chokestellhebel 9 are in an engagement plane. It is off Fig.
- the Fig. 6 shows a view of the carburetor 1 in a starting position of the lever assembly.
- throttle cable and attached to the Chokeberichthebel 10 control rod is moved so that the operating lever 6 with the throttle at a clockwise angle and the Chokeêthebel 10 with the Chokestellhebel 9 um an angle counterclockwise to be rotated.
- the movement of the gas actuating lever 7 causes the arm 14 is moved away from the Chokestellhebel 9 and the leg 15 far enough out of the recess 16 pivots out to allow rotation of the Chokestellhebels 9.
- the control rod moves the choke control lever 10 counterclockwise, whereby the Chokestellhebel 9 is entrained, the angle of rotation is sufficient that the leg 15 engages behind a detent 21 on the circumference of the Chokestellhebels 9 and rests against the Chokestellhebel. Then the choke flap is in the start position, ie it releases the cross section of the mixture treatment channel partially.
- Fig. 7 is a section of the carburettor 1 similar to that of Fig. 3 shows. From this illustration, the protruding from the carburetor housing 2 choke flap 22 can be seen. The leg 15 of the throttle lever 7 engages behind the locking lug 21, so that the Chokestellhebel 9 and the Chokematihebel 10 are prevented from being reset by the coil spring 17 in the rest position. Incidentally, for the same parts, the reference numerals with those of Fig. 6 match.
- the Fig. 8 shows a view of the carburetor 1 in a choke position of the lever assembly.
- the choke control lever 10 and the choke lever 9 are further rotated counterclockwise, whereby the choke flap is brought into its closed position.
- the throttle lever 7 remains unchanged, since the leg 15 is supported on a relative to the axis of rotation of the Chokestellhebels 9 uniform arc edge 23.
- the remaining reference numerals a the FIGS. 8 and 9 match for the same parts with those of the preceding figures.
- Fig. 9 a section of the carburetor is shown in the choke position of the lever assembly, wherein the curved edge 23, at the legs 15 is supported, it can be seen.
- the flaps in the carburetor 1 the engine can be started, wherein after starting the engine at the first actuation of the throttle lever by the operator of the throttle lever 7 is pivoted clockwise and thereby the Chokestellhebel 9 and the choke flap of the coil spring in the clockwise direction in the Be returned home position.
- the Fig. 10 shows the carburetor 1 in the view of the lever assembly in an intermediate position of the lever during its movement after the operation of the control switch in the "emergency stop position". If the "emergency stop position" is set on the operating switch of the implement, while the lever arrangement on the carburettor 1 is still set in the starting position, then the actuating rod moves the choker control lever 10 in a clockwise direction. As a result, the ramps 20 of the driver 12 slide on the inclined surfaces 27 of the Chokestellhebels 9 (see. Fig. 3 ), which has the consequence that the Chokestellhebel 9 is moved in the axial direction of the choke shaft 8 against the force of the coil spring 17.
- the drivers are then based on the surface of the Chokestellhebels 9, as in Fig. 11 is shown.
- This axial displacement of the Chokestellhebels 9 is sufficient to bring the Chokestellhebel 9 in a plane below the throttle lever 7 and thus cancel the locking of the leg 15 to the locking lug 21, as from Fig. 11 is apparent.
- the coil spring 17 ensures that the Chokestellhebel 9 and the choke flap are moved back to the normal position. Since then the leg 15 again in the region of the recess 16 and the driver 12 in the region of Recesses 13 are located, the Chokestellhebel 9 is pressed by the coil spring 17 in the axial direction of the choke shaft 8 against the Choke tenuhebel 10.
- the Fig. 12 shows a second embodiment of a carburetor 31 having a housing 32 with a mixture-processing channel 33 extending therein and a throttle valve 34 and a - Fig. 12 invisible - includes choke flap.
- the throttle valve is fixed to a rotatably mounted throttle shaft 35, which is provided at an end protruding from the housing 32 with a gas lever 36.
- a choke flap shaft is arranged in the carburetor housing 32, from the in Fig. 12 only one end 37 can be seen.
- On the choke valve shaft a Chokestellhebel 38 is arranged, which is in the representation in Fig. 12 in an engagement plane with the throttle lever 36 is located.
- a transverse pin 45 for fixing the Chokestellhebels 38 on the choke shaft is a transverse pin 45, on which the Chokestellhebel 38 is pivotally mounted about the axis of the transverse pin 45.
- a coil spring 39 is concentrically provided on the choke shaft, which serves both to restore the choke flap in its fully open position and the Chokestellhebel loaded in the direction of the engagement plane.
- the Chokestellhebel 38 is an elongated opening 40, in which the end 37 of the choke shaft protrudes, which is designed with respect to the cross section such that only in the longitudinal direction of the opening 40 and thus orthogonal to the longitudinal axis the transverse pin 45, a relative movement is possible.
- the position of throttle lever 36 and Chokestellhebel 38 in Fig. 12 corresponds to the in Fig. 6 shown starting position.
- Fig. 13 is the carburetor 31 according to Fig. 12 shown in another view, wherein additionally a control switch 41 and an actuating rod 42 are shown.
- the operating rod 42 is connected at one end 42 'to the operating switch 41, and another end 42 "is suspended in a corresponding receptacle 43 on the choke lever 38.
- the choking lever 38 is also adjusted, for example in Figs in Fig. 12 shown starting position.
- the throttle lever 36 mounted on the throttle shaft 35 and the choke lever 38 mounted on a choke shaft 44 are in the engagement plane in which cooperation of the levers is provided.
- the Chokestellhebel 38 is fixed by means of the transverse pin 45 to the choke shaft 44, wherein the coil spring 39 presses the Chokestellhebel 38 in the engagement plane.
- Out Fig. 13 is also located in the mixture processing channel 33 choke flap 46 can be seen.
- the Fig. 15 shows a modified view of the carburetor 31 according to Fig. 12 In the unlocked state of throttle lever 36 and Chokestellhebel 38.
- the Chokestellhebel 38 is pivoted about the axis of the transverse pin 45, so that the end 38 'of the Chokestellhebels 38 is lowered below the lower edge of the throttle lever 36 and thus the mutual engagement is canceled.
- the coil spring 39 then returns the choke lever 38 and the choke flap 46 to the home position in which the choke flap 46 fully opens the mixture processing channel 33.
- the coil spring 39 presses the side of the Chokestellhebels 38, on which the end 38 'is up, so that the Chokestellhebel 38 is again in the engagement plane.
- the reference numerals with those of FIGS. 12 to 14 match.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Description
Die Erfindung betrifft einen Vergaser für einen Verbrennungsmotor der im Oberbegriff des Anspruchs 1 genannten Gattung.The invention relates to a carburetor for an internal combustion engine referred to in the preamble of
Die
Aus der
Die
Die
Die
Bei den bekannten Anordnungen ist eine Entriegelung der Verrastung nur bei Betätigung des Gashebels möglich, bei allen anderen Einstellungen der Bedienungselemente bleibt die Verrastung zwischen Drosselklappe und Zwischenhebel erhalten.In the known arrangements unlocking the latching is possible only when the throttle lever, in all other settings of the controls, the locking between throttle and intermediate lever is maintained.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Vergaser der im Oberbegriff des Anspruchs 1 genannten Gattung zu schaffen, bei dem ein Bedienungsschalter für unterschiedliche Betriebsstellungen auch eine Notaus-Stellung umfasst, und bei Notentriegelung die Verrastung zwischen dem Gasstellhebel und dem Chokestellhebel gelöst wird.The present invention has for its object to provide a carburetor referred to in the preamble of
Diese Aufgabe wird durch einen Vergaser mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a gasifier with the features of
Durch die Erfindung wird erreicht, dass der der Chokeklappe zugeordnete Hebel am Vergaser und auch die Chokeklappe selbst in eine Grundstellung gebracht werden, aus der heraus ein neuer Betätigungsvorgang erfolgen kann. Bei Nichtbetätigung von "Notaus" hat die Auslösekinematik keinen Einfluss auf die Hebelkinematik von Drossel- und Chokeklappe.By the invention it is achieved that the lever associated with the choke flap on the carburetor and also the choke flap itself are brought into a basic position, from the out a new actuation process can take place. If "Emergency Stop" is not activated, the triggering kinematics will not affect the throttle and choke flap lever kinematics.
Gemäß einer bevorzugten Ausgestaltung der Erfindung ist der Chokestellhebel drehfest mit der Chokewelle verbunden und die Feder belastet die Chokeklappe zusätzlich in Richtung einer Öffnungsstellung. Auf diese Weise kann die Zahl der Bauteile reduziert werden. Die Vorrichtung an der Chokewelle ist vorzugsweise gegenüber dem Chokestellhebel begrenzt bewegbar gelagert. Auf diese Weise kann die Chokeklappe in ihre Offenstellung gebracht werden, obwohl der Bedienungsschalter in seiner Stellung "Notaus" verharrt. Erfindungsgemäß verschiebt die Vorrichtung zur Entriegelung den Chokestellhebel gegen die Kraft einer Feder axial auf der Chokewelle oder der Chokestellhebel ist an der Chokewelle kippbar gelagert, und die Vorrichtung wird durch eine Betätigungsstange gebildet, die die Kippbewegung erzeugt. Verschiebt die Vorrichtung zur Entriegelung den Chokestellhebel gegen die Kraft einer Feder axial auf der Chokewelle, so gelangt der Chokestellhebel durch diese Bewegung des Chokestellhebels in eine andere Ebene relativ zu dem Gasstellhebel, so dass die Verrastung aufgehoben wird.According to a preferred embodiment of the invention, the Chokestellhebel is rotatably connected to the choke shaft and the spring loads the choke additionally in the direction of an open position. In this way, the number of components can be reduced. The device on the choke shaft is preferably mounted limited movable relative to the Chokestellhebel. In this way, the choke flap can be brought into its open position, although the operating switch remains in its "emergency stop" position. According to the invention the unlocking device displaces the Chokestellhebel axially against the force of a spring on the choke shaft or the Chokestellhebel is tiltably mounted on the choke shaft, and the device is formed by an actuating rod which generates the tilting movement. Moves the device for unlocking the Chokestellhebel against the force of a spring axially on the choke shaft, the Chokestellhebel passes through this movement of the Chokestellhebels in another plane relative to the throttle lever, so that the locking is released.
Ist der Chokestellhebel an der Chokewelle kippbar gelagert, und die Vorrichtung wird durch eine Betätigungsstange gebildet, die die Kippbewegung erzeugt, so ist hierzu der Chokestellhebel vorzugsweise auf einem durch die Chokewelle ragenden Querstift gelagert. In dem Chokestellhebel ist zweckmäßigerweise eine längliche Öffnung vorgesehen, in die ein Ende der Chokewelle ragt und zwischen der Kontur der Öffnung und dem Ende der Chokewelle ist ein Abstand gegeben, der einen definierten Kippwinkel ermöglicht.If the Chokestellhebel tiltably mounted on the choke shaft, and the device is formed by an actuating rod which generates the tilting movement, so this Chokestellhebel is preferably mounted on a protruding through the choke shaft cross pin. In the Chokestellhebel expediently an elongated opening is provided in the one End of the choke shaft protrudes and between the contour of the opening and the end of the choke shaft is given a distance that allows a defined tilt angle.
Gemäß einer zweckmäßigen Ausgestaltung ist eine konzentrisch zur Chokewelle angeordnete Schraubenfeder vorgesehen, die den Chokestellhebel in Drehrichtung und axialer Richtung belastet. Auf diese Weise erfüllt die Schraubenfeder zwei Funktionen, nämlich die Rückstellung der Chokeklappe in ihre geöffnete Stellung und die Rückstellung des Chokestellhebels.in die Ebene für das Zusammenwirken mit dem Gasstellhebel. Bei der ersten Ausführungsform umfasst die Vorrichtung zur Entriegelung in zweckmäßiger Weise einen Chokesteuerhebel, der mechanisch mit dem Chokestellhebel koppelbar ist. Der Chokesteuerhebel ist auf der Chokewelle fixiert, aber gegenüber dieser zumindest in einer Richtung frei drehbar. Dieser Chokesteuerhebel umfasst mindestens einen Mitnehmer, der in eine Ausnehmung des Chokestellhebels eingreift. Dabei ist der Mitnehmer so ausgestaltet, dass der Chokesteuerhebel auf den Chokestellhebel einwirkt, wenn die Chokeklappe geschlossen werden soll.According to an advantageous embodiment, a concentric with the choke shaft arranged coil spring is provided which loads the Chokestellhebel in the direction of rotation and axial direction. In this way, the coil spring fulfills two functions, namely the return of the choke flap to its open position and the return of the Chokestellhebels.in the plane for the interaction with the throttle lever. In the first embodiment, the unlocking device suitably comprises a choke control lever which can be mechanically coupled to the choke lever. The choke control lever is fixed on the choke shaft, but freely rotatable with respect to this at least in one direction. This choke control lever comprises at least one driver, which engages in a recess of the Chokestellhebels. The driver is designed so that the choke control lever acts on the choke lever when the choke flap is to be closed.
Zur Erzeugung der axialen Bewegung des Chokestellhebels ist es zweckmäßig, dass der Chokesteuerhebel mindestens eine Rampe umfasst, die mit dem Chokestellhebel in axialer Richtung zusammenwirkt. Es ist darüber hinaus vorteilhaft, dass zwei Mitnehmer an dem Chokesteuerhebel angeordnet sind, vorzugsweise diametral bezogen auf die Chokewelle und an jedem der Mitnehmer eine Rampe ausgebildet ist. Auf diese Weise lassen sich die Kräfte gleichmäßig aufteilen und ein Verklemmen des Chokesteuerhebels wird vermieden. Um die Betätigungskräfte zu reduzieren ist es zweckmäßig, dass an dem Chokestellhebel Schrägflächen ausgebildet sind, die den gleichen Neigungswinkel aufweisen, wie die Rampen. Es ist außerdem zweckmäßig, dass an dem Chokestellhebel ein Vorsprung vorgesehen ist, der als Anschlag für den Mitnehmer in Schließrichtung der Chokeklappe dient.To generate the axial movement of the Chokestellhebels it is expedient that the Chokesteuerhebel comprises at least one ramp which cooperates with the Chokestellhebel in the axial direction. It is also advantageous that two drivers are arranged on the Chokesteuerhebel, preferably diametrically relative to the choke shaft and at each of the drivers a ramp is formed. In this way, the forces can be divided evenly and jamming of the choke control lever is avoided. In order to reduce the actuating forces, it is expedient that inclined surfaces are formed on the Chokestellhebel having the same angle of inclination, as the ramps. It is also appropriate that on the Chokestellhebel a projection is provided which serves as a stop for the driver in the closing direction of the choke flap.
Ein Ausführungsbeispiel der Erfindung ist nachstehend anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:
- Fig. 1
- eine perspektivische Ansicht einer ersten Ausführungsform des Vergasers,
- Fig. 2
- eine Ansicht des Vergasers in Richtung auf eine Hebelanordnung für eine Drosselklappe und eine Chokeklappe in einer Stoppposition,
- Fig. 3
- eine vergrößerte Darstellung eines Ausschnitts des Vergasers im Wesentlichen in Richtung des Pfeiles III gemäß
Fig. 2 , - Fig. 4
- eine Ansicht gemäß
Fig. 2 mit der Hebelanordnung in Leerlaufstellung, - Fig. 5
- eine Ansicht gemäß
Fig. 3 in der Leerlaufstellung (in ähnlicher Perspektive), - Fig. 6
- eine Ansicht gemäß
Fig. 2 in einer Startposition der Hebelanordnung, - Fig. 7
- eine Ansicht des Ausschnitts des Vergasers gemäß
Fig. 3 in nach vorne geneigter Perspektive in der Startposition, - Fig. 8
- eine Ansicht gemäß
Fig. 2 in einer Chokeposition, - Fig. 9
- eine Ansicht gemäß
Fig. 7 in einer etwas um die Hochachse des Vergasers gedrehten Perspektive in der Chokeposition, - Fig. 10
- eine Ansicht gemäß
Fig. 2 in einer Zwischenposition der Bewegung der Hebel nach Betätigung des Bedienungsschalters in eine "Notaus-Stellung", - Fig. 11
- einen Ausschnitt des Vergasers in perspektivischer Darstellung mit der Hebelanordnung in der Zwischenposition gemäß
Fig. 10 , - Fig. 12
- eine perspektivische Ansicht einer zweiten Ausführungsform des Vergasers,
- Fig. 13
- eine andere Ansicht des Vergasers in
Fig. 12 mit einem Bedienungsschalter und einer Betätigungsstange, - Fig. 14
- eine Darstellung gemäß
Fig. 13 während der Auslösebewegung, - Fig. 15
- eine geänderte Ansicht des Vergasers gemäß
Fig. 12 in der entriegelten Position der Hebel.
- Fig. 1
- a perspective view of a first embodiment of the carburetor,
- Fig. 2
- 3 is a view of the carburetor in the direction of a lever arrangement for a throttle flap and a choke flap in a stop position,
- Fig. 3
- an enlarged view of a section of the carburetor substantially in the direction of arrow III according to
Fig. 2 . - Fig. 4
- a view according to
Fig. 2 with the lever arrangement in idle position, - Fig. 5
- a view according to
Fig. 3 in idle position (in a similar perspective), - Fig. 6
- a view according to
Fig. 2 in a starting position of the lever arrangement, - Fig. 7
- a view of the section of the carburetor according to
Fig. 3 in a forward tilted perspective in the starting position, - Fig. 8
- a view according to
Fig. 2 in a choke position, - Fig. 9
- a view according to
Fig. 7 in a perspective about the vertical axis of the carburetor in the choke position, - Fig. 10
- a view according to
Fig. 2 in an intermediate position of the movement of the levers after actuation of the operating switch in an "emergency stop position", - Fig. 11
- a detail of the carburetor in perspective with the lever assembly in the intermediate position according to
Fig. 10 . - Fig. 12
- a perspective view of a second embodiment of the carburetor,
- Fig. 13
- another view of the carburetor in
Fig. 12 with an operating switch and an operating rod, - Fig. 14
- a representation according to
Fig. 13 during the triggering movement, - Fig. 15
- a modified view of the carburetor according to
Fig. 12 in the unlocked position of the lever.
Die
Quer zum Gemischaufbereitungskanal 3 ist im Vergasergehäuse 2 eine Chokewelle 8 angeordnet, auf der die in
In
Die
Die Mitnehmer 12 am Chokesteuerhebel 10 ragen in die Ausnehmungen 13 des Chokestellhebels 9, wobei aus
In Drehrichtung des Chokesteuerhebels 10 entgegen dem Uhrzeigersinn legt sich der Mitnehmer 12 mit seiner Kontur 26 an den Vorsprung 9' und schleppt auf diese Weise den Chokestellhebel 9 mit, wodurch die Chokeklappe verstellt wird, und zwar im Sinne eines Schließens des Gemischaufbereitungskanals. Der in
Die
Die
In
Die
In
Die
Die
Zwischen dem Gehäuse 32 und dem Chokestellhebel 38 ist konzentrisch auf der Chokewelle eine Schraubenfeder 39 vorgesehen, die sowohl zur Rückstellung der Chokeklappe in ihre vollständig geöffnete Stellung dient als auch den Chokestellhebel in Richtung auf die Eingriffsebene belastet. In dem Chokestellhebel 38 befindet sich eine längliche Öffnung 40, in die das Ende 37 der Chokewelle ragt, wobei dieses bezüglich des Querschnitts derart gestaltet ist, dass nur in Längsrichtung der Öffnung 40 und somit orthogonal zur Längsachse des Querstiftes 45 eine Relativbewegung möglich ist. Die Stellung von Gasstellhebel 36 und Chokestellhebel 38 in
In
Wenn der Bedienungsschalter 41 in die "Notaus-Stellung" bewegt wird, so hat dies eine Bewegung der Betätigungsstange derart zur Folge, dass das Ende 42" auf den Chokestellhebel 38 drückt. Da der Punkt der Krafteinleitung außerhalb der Achse des Querstiftes 45 liegt, wird der Chokestellhebel 38 um diese Achse verschwenkt und das dem Gasstellhebel 36 zugewandte Ende 38' des Chokestellhebels 38 gegen die Kraft der Schraubenfeder 39 abgesenkt. In
Die
Claims (12)
- Carburettor (1) for an internal combustion engine having a mixing and preparation duct (3) formed in a carburettor main body (2), a throttle valve (4) and a choke valve (22) being rotatably arranged in the mixing and preparation duct, and having a leverage system which comprises a petrol adjusting lever (7) fixed on a throttle valve shaft (5) and a choke adjusting lever (9) fixed on a choke shaft (8), wherein the throttle valve (4) and the choke valve (22) can be set in a plurality of operating positions and the leverage system assumes corresponding positions, wherein a spring (17) is present, of which the force loads the choke adjusting lever (9, 38) towards an engagement plane with the petrol adjusting lever (7, 36), wherein a device for unlocking is provided between the petrol adjusting lever (7) and the choke adjusting lever (9), characterised in that the device for unlocking is provided between the petrol adjusting lever (7) and the choke adjusting lever (9) in an emergency activation, and the device for unlocking displaces the choke adjusting lever (9) against the force of the spring (17) axially on the choke shaft (8), or the choke adjusting lever (38) is tiltably mounted on the choke shaft (8) and the device is formed by an activating rod (42) which produces the tilt motion.
- Carburettor according to claim 1,
characterised in that the choke adjusting lever (9) is securely connected, fixed-in-rotation, to the choke shaft (8) and the spring (17, 39) loads the choke valve (22) additionally towards an open position. - Carburettor according to claim 1 or 2,
characterised in that the device is mounted on the choke shaft so that it can be moved limitedly with respect to the choke adjusting lever (9). - Carburettor according to one of claims 1 to 3,
characterised in that a cross-pin (45) is fixed in the choke shaft (8), on which cross-pin (45) the choke adjusting lever (38) is tiltably mounted. - Carburettor according to claim 4,
characterised in that an opening is provided in the choke adjusting lever (38), into which one end of the choke shaft (8) projects, and there is a spacing between the contour of the opening and the end (37) of the choke shaft (8), which facilitates a defined tilt angle. - Carburettor according to one of claims 1 to 4,
characterised in that a helical spring (17) arranged concentrically to the choke shaft (8) is provided, which loads the choke adjusting lever (9) in the rotating direction and axial direction. - Carburettor according to claim 3,
characterised in that the device comprises a choke control lever (10), which can be mechanically coupled to the choke adjusting lever (9). - Carburettor according to claim 7,
characterised in that the choke control lever (10) comprises at least one entrainment member (12), which engages in a recess (13) of the choke adjusting lever (9). - Carburettor according to one of claims 7 or 8,
characterised in that the choke control lever (10) comprises at least one ramp (20), which cooperates with the choke adjusting lever (9) in the axial direction. - Carburettor according to claim 9,
characterised in that two entrainment members (12) are arranged on the choke control lever (10) and a ramp (20) is formed on each of the entrainment members (12). - Carburettor according to claim 10,
characterised in that inclined surfaces (27) are formed on the choke adjusting lever (9) which have the same angle of inclination as the ramps (20). - Carburettor according to one of claims 8 to 11,
characterised in that at least one projection (9', 9') is provided on the choke adjusting lever (9), which serves as a stop for the entrainment member (12) in the closing direction of the choke valve (22).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009014362A DE102009014362A1 (en) | 2009-03-21 | 2009-03-21 | Carburettor for an internal combustion engine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2230395A2 EP2230395A2 (en) | 2010-09-22 |
EP2230395A3 EP2230395A3 (en) | 2014-04-02 |
EP2230395B1 true EP2230395B1 (en) | 2017-05-31 |
Family
ID=42229097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10002100.5A Active EP2230395B1 (en) | 2009-03-21 | 2010-03-02 | Carburettor for a combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US8356805B2 (en) |
EP (1) | EP2230395B1 (en) |
JP (1) | JP5486975B2 (en) |
CN (1) | CN101839192B (en) |
DE (1) | DE102009014362A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202009000831U1 (en) * | 2009-01-22 | 2010-06-17 | Dolmar Gmbh | Carburettor unit for a motor unit |
DE102010048773A1 (en) * | 2010-10-16 | 2012-04-19 | Andreas Stihl Ag & Co. Kg | carburettor |
DE102012019128A1 (en) * | 2012-09-28 | 2014-04-03 | Andreas Stihl Ag & Co. Kg | Adjustment lock for an adjustment screw on a carburetor |
US10125696B2 (en) * | 2015-04-14 | 2018-11-13 | Walbro Llc | Charge forming device with throttle valve adjuster |
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US3305223A (en) * | 1965-09-30 | 1967-02-21 | Briggs & Stratton Corp | Carburetor with improved choke valve control |
US3328010A (en) * | 1965-12-23 | 1967-06-27 | Holley Carburetor Co | Carburetor |
US3575385A (en) * | 1969-04-10 | 1971-04-20 | Acf Ind Inc | Throttle linkage mechanism for a multistage carburetor |
US3807709A (en) * | 1970-09-24 | 1974-04-30 | Nippon Denso Co | Carburetor |
JPS59155544A (en) * | 1983-02-25 | 1984-09-04 | Nippon Carbureter Co Ltd | Apparatus for operating throttle valve used for controlling quantity of intake air of engine |
JPS60141439U (en) * | 1984-02-28 | 1985-09-19 | 富士重工業株式会社 | engine control device |
JPS63289247A (en) * | 1987-05-22 | 1988-11-25 | Walbro Far East Inc | Operating device for carburetor |
CA1321933C (en) * | 1988-06-29 | 1993-09-07 | Kazuyuki Kobayashi | Control apparatus for an engine |
DE3842974A1 (en) * | 1988-12-21 | 1990-06-28 | Stihl Maschf Andreas | DIAPHRAGM CARBURETTOR WITH POSITIONALLY COUPLED THROTTLE VALVE AND CHOKE VALVE |
DE4117554B4 (en) * | 1991-05-29 | 2004-05-27 | Walbro Gmbh | Carburetor for an internal combustion engine, in particular a chain saw |
SE502893C2 (en) * | 1994-06-01 | 1996-02-12 | Electrolux Ab | Device for regulating a carburetor for an internal combustion engine |
JPH10141139A (en) * | 1996-11-06 | 1998-05-26 | Mitsubishi Heavy Ind Ltd | Choke valve operating device of rotary throttle valve type carburetor |
US6000683A (en) * | 1997-11-26 | 1999-12-14 | Walbro Corporation | Carburetor throttle and choke control mechanism |
US6202989B1 (en) * | 1999-02-18 | 2001-03-20 | Walbro Corporation | Carburetor throttle and choke control mechanism |
US6494439B1 (en) * | 1999-10-14 | 2002-12-17 | Homelite Technologies, Ltd. | Carburetor control system having two cam members connected to choke valve and throttle valve |
JP3864027B2 (en) * | 2000-02-10 | 2006-12-27 | 株式会社共立 | Intake control mechanism |
DE20009208U1 (en) | 2000-05-22 | 2000-08-03 | Dolmar GmbH, 22045 Hamburg | System for operating a carburetor of an internal combustion engine |
US6439547B1 (en) * | 2001-03-05 | 2002-08-27 | Walbro Corporation | Carburetor throttle and choke control mechanism |
JP4602596B2 (en) * | 2001-06-01 | 2010-12-22 | ザマ・ジャパン株式会社 | Vaporizer |
JP4414115B2 (en) * | 2001-08-03 | 2010-02-10 | 本田技研工業株式会社 | Carburetor choke valve device |
DE10145293B4 (en) * | 2001-09-14 | 2012-04-05 | Andreas Stihl Ag & Co. | carburetor arrangement |
JP2004176634A (en) * | 2002-11-27 | 2004-06-24 | Walbro Japan Inc | Carburetor for stratified scavenging |
US6848405B1 (en) * | 2003-07-17 | 2005-02-01 | Walbro Engine Management , L.L.C. | Self-relieving choke starting system for a combustion engine carburetor |
JP2005048669A (en) * | 2003-07-29 | 2005-02-24 | Kioritz Corp | Backpack unit |
JP2005155525A (en) * | 2003-11-27 | 2005-06-16 | Zama Japan Co Ltd | Carburetor with manual choke mechanism |
US7144000B2 (en) * | 2004-08-24 | 2006-12-05 | Briggs & Stratton Corporation | Automatic choke for an engine |
JP2006077706A (en) * | 2004-09-10 | 2006-03-23 | Walbro Japan Inc | Starting device for carburetor |
US20070240892A1 (en) | 2005-11-04 | 2007-10-18 | Black & Decker Inc. | Cordless outdoor power tool system |
US7699294B2 (en) * | 2007-04-20 | 2010-04-20 | Walbro Engine Management, L.L.C. | Charge forming device with idle and open throttle choke control |
CN201092901Y (en) * | 2007-07-31 | 2008-07-30 | 重庆宗申技术开发研究有限公司 | Carburetor capable of automatically closing wind-proof door |
CN201170141Y (en) * | 2008-01-21 | 2008-12-24 | 陈俭敏 | Carburetor |
-
2009
- 2009-03-21 DE DE102009014362A patent/DE102009014362A1/en not_active Ceased
-
2010
- 2010-03-02 EP EP10002100.5A patent/EP2230395B1/en active Active
- 2010-03-19 CN CN201010145546.8A patent/CN101839192B/en active Active
- 2010-03-19 US US12/727,277 patent/US8356805B2/en active Active
- 2010-03-23 JP JP2010065932A patent/JP5486975B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
JP2010223232A (en) | 2010-10-07 |
CN101839192B (en) | 2014-05-28 |
CN101839192A (en) | 2010-09-22 |
EP2230395A2 (en) | 2010-09-22 |
US8356805B2 (en) | 2013-01-22 |
JP5486975B2 (en) | 2014-05-07 |
EP2230395A3 (en) | 2014-04-02 |
US20100283161A1 (en) | 2010-11-11 |
DE102009014362A1 (en) | 2010-09-23 |
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