DE102015115654B4 - Encoder for the mixture adjustment of an internal combustion engine - Google Patents

Abstract

Encoder (1) for the mixture adjustment of an internal combustion engine (2), in particular in a construction machine (3), preferably in a soil compactor, with a manually adjustable actuator (4), which between a full throttle position (5), a stop position (6) and an intermediate Neutral position (7) on a transmitter housing (8) is movably guided, wherein the actuator (4) is in operative connection with a transmission element (9) for transmitting the desired position to a Gemischbildner (10) of the internal combustion engine (2), and with a mechanical actuatable fuel shut-off device (11) for opening or closing a fuel feed (12) for the internal combustion engine (2) and with an electrical contacting device (13) for switching an electric circuit connectable to an ignition device of the internal combustion engine (2), characterized in that the transmitter housing (8 ) with two inputs (16, 17) for insertion of the Transmission element is formed, and in that the electrical contacting device (13) at least two electrically conductive contacts (38, 39), which are electrically connected to each other by means of a on the actuator (4) provided portion (34) for switching the contacting device (13).

Description

The invention relates to sensors for the mixture adjustment of an internal combustion engine, in particular in a construction machine, preferably in a soil compactor.

State of the art

From the EP 0 781 910 B1 a gas actuation device is known for the cultivation of soil compaction equipment internal combustion engines with diaphragm carburetor. This device has a lockable connection between the fuel tank and the carburetor of the internal combustion engine. Further, an actuator in the form of a lever is provided to adjust the speed of the engine during operation and turn it off optionally. The shutdown of the engine can be done in two different variants. In the first variant, the lever is moved to a position in which a cam provided on the lever closes a fuel cock, so that the internal combustion engine comes to a standstill as soon as the amount of fuel on the carburettor side has been consumed. In the second variant, a further lever position is disclosed, which allows to stop the engine immediately by using the lever, a short-circuit button or switch is operated, with a breaker line of the ignition device of the engine is switched.

Overall, the one in the EP 0 781 910 B1 disclosed levers together with the two stop positions, a neutral position and a full throttle position, four different lever positions in which the soil compactor can be operated or shut down.

In typical situations of use of such tools as simple as possible operability of advantage, since usually a detailed briefing in the operation can not be done. The prior art already satisfies this requirement in that, in the two engine stop positions, the fuel cock of the internal combustion engine is closed to prevent the carburettor from overflowing. However, this configuration involves the risk that the engine of the soil compaction device is inadvertently overridden when the idle position of the lever is confused with the first stop position and the internal combustion engine with the available carburetor side fuel remaining amount expires only slowly. This can lead to productivity disadvantages in operation, since the internal combustion engine must be restarted to continue the work.

task

Against this background, it is therefore an object of the invention to improve the known from the prior art device to the effect that a simplified operation for a user is given.

It is a further object of the invention to improve a transmitter so that it can be used in its entirety or at least largely as a standardized component in the mass production of different tools easily and inexpensively.

The first object is achieved by a transmitter with features of claim 1.

The second object is achieved by a transmitter having the features of patent claim 4.

Further embodiments of the invention are the subject of the dependent claims.

According to the invention it is provided to provide a sensor for the mixture adjustment of an internal combustion engine, which can be used in particular in a construction machine, and preferably in a soil compactor. The encoder has a manually adjustable actuator, which is movably mounted between a full throttle position, a stop position, and an intermediate neutral position on a transmitter housing. The actuator is in operative connection with a transmission element, which is designed to transmit the desired position of the actuator to a Gemischbildner the internal combustion engine. For example, the mixture former may be a gasifier. Furthermore, the actuator is in operative connection with a mechanically actuable Kraftstoffabsperreinrichtung, which is designed to open or close a fuel supply for the internal combustion engine.

Furthermore, the actuator is operatively connected to an electrical contacting device which optionally electrically connects at least two electrical conductors provided on the transmitter, i. can switch.

According to the invention, the transmitter is characterized in that both the actuation of the fuel shut-off device ( 11 ) as well as the switching of the contacting device ( 13 ) the transfer of the actuator ( 4 ) in an actuating position of the actuator ( 4 ) assigned. In this case, the mechanism of the transmitter for a simultaneous actuation of the Kraftstoffabsperreinrichtung and the switching of the contacting is formed, so that in an operating position of the actuator both the Actuating the Kraftstoffabsperreinrichtung and the switching of the contacting takes place. This has the advantage that only a stop position of the actuator is required, and that the Kraftstoffabsperreinrichtung is actuated when the same contacting device is switched. This happens when the manually adjustable actuator, for example, transferred to the stop position or transferred from the stop position to the idle position or in the full throttle position. In this way, there can be no confusion between different stop positions or a confusion of the stop position with the idle position.

According to a preferred embodiment, the closing of the circuit or the connection of the electrical conductors takes place simultaneously with the closing of the Kraftstoffabsperreinrichtung. Once the manually adjustable actuator is transferred to the stop position, the internal combustion engine stops because both the fuel supply is interrupted and the ignition device is switched off. The user receives immediate feedback that the actuator has been transferred to the stop position.

In a preferred embodiment of the invention, the fuel shut-off device is opened simultaneously with the disconnection of the electrical conductors or opening of the underlying circuit.

This has the advantage that at the same time the gasoline supply to the mixture former is opened during startup, and an interruption of the ignition device is canceled. Thus, only a single preparatory step for commissioning the internal combustion engine is required.

According to a further embodiment of the invention, the encoder housing has two inputs, through which the transmission element can be passed. In this way, different installation situations in different products can be taken into account. Usually one input is used for passing the transmission element and at the same time the other is not used. For example, in a first machine, the transmission member may be inserted from a front side into the encoder housing while being inserted from a rear side in a different type of machine. The production costs for such standardized encoder housing and a large part of the other encoder components can be significantly reduced in this way.

It is also conceivable that the transmission element or underlying, connected to the Gemischbildner connecting parts, is guided simultaneously through both inputs, for example in the form of a rope loop.

The aforementioned design of the encoder housing with two inputs and the underlying inventive concept can be seen independently of a simultaneous actuation of the Kraftstoffabsperreinrichtung and the switching of the contacting device for achieving the second object stated above, as is reflected in the independent claim 5.

According to a further embodiment, the entrances may be designed to be at least partially closable. In this way, the respectively unused input of the encoder housing can be protected from the ingress of dirt and moisture. In particular, this can be done by a locking the input screw. At the respective entrances, internal threads can be provided anyway, which are provided for fixing a guide of the transmission element or a guide for any connection parts.

According to a further advantageous embodiment of the invention, the inputs are provided opposite each other. Preferably, the inputs can be arranged mirror-symmetrically to one another. In particular, the inputs may be arranged mirror-symmetrically with respect to an axis of symmetry which extend approximately perpendicular to a longitudinal extension of the transmission element within the transmitter housing and approximately perpendicular to a rotational axis of the actuator. In this way, the encoder housing is easier to produce, since the associated molds can be designed symmetrically. Furthermore, this design brings structural advantages with it.

According to a preferred embodiment of the invention, in particular according to claim 8, the contacting can be integrated into the encoder housing. This has the advantage that a simpler structure is possible because the components required for the control of the internal combustion engine are compactly bundled in the transmitter and not distributed over the machine.

According to a further embodiment of the invention, the actuator may have a lever pivotable about a rotation axis. In this way, the force required for the mixture adjustment force can be easily applied to the user. Furthermore, the operating state is easily read directly on the lever position.

According to an advantageous embodiment, the actuator may have a gear, which during rotation of the lever performs a rotation. The gear can engage with its teeth in a counter-toothing of the transmission element for transmitting the lever movement to the transmission element. In this way, the reciprocating pivotal movement of the lever can be easily transmitted to the transmission element. Furthermore, the use of a gear allows to design the described mechanical connection cost, since such gears can be preferably selected from a set of standardized machine elements.

According to a further advantageous form of the invention, the transmission element may be formed as a rack. Here is also the advantage that standardized machine elements can be used. In addition, this solution is a simple and secure transmission of the forces present on the lever. The rack may extend in a variant up to the Gemischbildner out and attack there directly. According to another variant, the rack may also be made shorter and be connected by an intermediate connecting element with the mixture images. In a variant, the rack may be formed so short that their movement is completely within the encoder housing, and attack any connecting parts within the encoder housing to the rack.

A rack is basically a way to convert a rotational movement of the actuator in a translational movement to use this translational movement as a control variable for the Gemischbildner. In this case, the translational movement can extend on an approximately straight path.

In a preferred embodiment of the invention, the transmission element may have a control surface which is in mechanical operative connection with the fuel shut-off device. In this way, movement of the transmission member relative to the nearby mechanically operable fuel shut-off device may be utilized to actuate the fuel cutoff device. A control surface has the advantage that it can be easily formed on a mechanical component. In the present invention, this can be done in particular by a recess on the transmission element, which can be provided by a simple machining step, such as milling, on the transmission element.

According to one embodiment of the invention, the Kraftstoffabsperreinrichtung may comprise a valve which is in operative connection with the actuator. In particular, this valve may have a slide valve. In this way, the fuel flow to the mixture former can be opened and closed again by simple means. When using a slide valve, it is only necessary to carry out a lifting movement, which transfers the slide of the valve from the open to the closed position. In particular, this can be done with the aforementioned control surface on the transmission element.

According to a further embodiment of the invention, the valve with a cam in operative connection with the control surface of the transmission element, so that the valve against an elastic restoring force, in particular in the valve opening direction, is actuated by the action of the control surface on the cam. The elastic restoring force can be applied in particular by means of a valve spring, which is to be provided in or on the valve. The interaction of a cam on the valve with a control surface on the transmission element has the property that the operative connection, for example to open the valve, by pressing the cam. The return of the valve in the closed position is effected by the elastic restoring force as soon as the control surface clears the way for a stroke of the cam again.

According to a further embodiment of the invention, at least one electrically conductive portion of the actuator may rub frictionally on the transmitter housing, in particular an associated wall. In this way it is possible to carry out the optional connection of the electrical conductor provided on the encoder by simple means. In this case, the electrical contacting device acts together with the electrically conductive portion of the actuator as a kind of switching device, which causes the optional connection of the at least two provided on the encoder electrical conductor when the electrically conductive portion of the actuator in certain positions with respect to the encoder housing located.

In particular, the sliding portion of the actuator may be formed as a slider at least partially embedded in the actuator. The separate design of the slider can simplify the production of the actuator, since only the standing in contact with the encoder housing part of the actuator must be made electrically conductive to ensure the function of the encoder. It is advantageous if the slider on the one hand ensures a good and reliable electrical contact and on the other hand, the wear caused by the sliding and the mechanical friction between the actuator and the encoder housing only minimal impact on abrasion and thus wear. A partial embedded slider could be, for example, interchangeable. It could also be provided with low abrasion resistance to the material of the encoder housing, so that this component first wears and possibly can be replaced, the other components of the transmitter housing contrast, have a significantly longer life.

Preferably, the slider is held in the actuator under a resilient bias against the encoder housing. In this way, the contact pressure with which the slider is pressed against the encoder housing, can be easily defined and on the other hand remain a gap between the actuator and the encoder housing, which counteracts potential rubbing wear between the actuator and the encoder housing. In addition, the resilient bias can compensate for a wear-induced change in thickness of the slider in certain range, so that the intended function of these components is given over a long period of time.

The resilient bias may be applied by a slider spring disposed between the slider and the actuator.

Preferably, the slider may be made of materials having particular sliding properties and at the same time good electrical conductivity. For example, the slider can be made of brass. Brass is relatively easy to process, has good abrasion resistance and corrosion resistance, yet is a good electrical conductor. Furthermore, the slider can be made of sintered bronze, which has particularly good friction properties for sliding on the encoder housing, at the same time good electrical conductivity. Alternatively, the slider can be made of carbon, which is also a good electrically conductive material, and has well-defined friction and abrasion properties.

It is also possible that the slider is not entirely made of one of the aforementioned materials, but only one of these materials contains, if the slider is constructed, for example, in several parts.

In a further embodiment of the invention, the electrical contacting device may comprise at least two electrically conductive contacts which can be electrically connected to one another by means of a section provided on the actuator for switching the contacting device. In this way, an electrical switching device may be formed which does not require any additional moving parts to make or optionally disconnect between the at least two electrically conductive contacts. The electrically conductive contacts are connected to the electrical conductors to the encoder. In particular, the electrical contacts form the ends of the electrical conductor provided on the encoder.

Preferably, at least one of the electrically conductive contacts in the transmitter housing preferably not be embedded embedded, in particular glued or cast. This is an advantage under manufacturing aspects. Further, embedding the contacts in the transmitter housing has the advantage that they are very resistant to any vibrations present. Thus, fault cases can be minimized, in which contacts solve themselves by housing vibrations automatically. Pouring the contacts may have the advantage of avoiding additional process steps for attaching the contacts in the housing. If the contacts are glued into the housing, it is possible to align them particularly well with respect to the area in which the contacts come into contact with the actuator. In this way, the installation position of the contacts can be well controlled. In a variant, the contacts may have barbs which counteract an independent release of the contacts from the encoder housing.

The electrically conductive contacts may be made in a variant of brass, in particular at least partially tinned brass. Brass is a good electrical conductor with relatively good corrosion resistance combined with good frictional properties. Tinning on the face of the contacts can improve corrosion resistance or abrasion resistance. The use of other materials for the contacts is also conceivable.

According to a further embodiment, the actuator can be moved out of the respective position by overcoming a transition resistance formed by positive engagement or frictional engagement and can be transferred into the respective next desired position. This is a further measure from the prior art to better define the position of the actuator for the user to avoid inadvertent misalignment of the actuator.

In particular, it may be provided that discrete detent positions are assigned to the desired positions. In this way, the user receives an even more noticeable haptic feedback that the actuator is moved out of a certain position or guided into a specific position. Furthermore, discrete detent positions have the advantage that the actuator is held by an additional force in the respective position, so that an automatic adjustment of the actuator, such as on the Encoder housing present vibration is unlikely.

In a particularly preferred embodiment, the encoder may have a latching mechanism, preferably a ball catch for forming the contact resistance. This allows the proposed discrete locking positions to be realized with simple means.

In particular, the locking mechanism may have a rotatable about the axis of rotation of the actuator described above disc spring and a driver, in which a locking element, preferably a ball is received, wherein the plate spring biases the locking element with an elastic force against a non-rotatably provided on the encoder housing locking segment. In this way it is possible to provide the discrete locking positions with minimal changes to the other components.

Preferably, the latching segment along the pivoting path of the lever, preferably extend arcuately and along this pivoting path have at least one receptacle or an opening for engaging the locking element. Furthermore, the locking segment made of a hardened material, such as steel. In this way it is possible to provide the locking mechanism and the associated latching segment in a simple manner within the actuator, whereby a significant saving of the installation space is achieved.

The Kraftstoffabsperreinrichtung may be arranged according to a further embodiment in a housing connected to the encoder housing section. This allows a much more compact design than is known from the prior art. Furthermore, in this way the encoder can be inserted together with the essential components as a unitary assembly in an assembly process.

In particular, it is advantageous if the housing section, in which the Kraftstoffabsperreinrichtung is located rotatably disposed with respect to the encoder housing. In this way, provided on the housing portion connecting elements for a fuel line, such as barbs, optimally align with respect to the surrounding components. In combination with the above-described two inputs for the transmission element, the flexibility of applicability of the present encoder significantly increases with respect to applying it as an assembly in different installation situations and different machines.

Also included in the inventive concept is an internal combustion engine which has the encoder according to the invention or one of the previously described variants of the transmitter.

Furthermore, a construction machine with such an internal combustion engine is covered by the inventive idea.

In particular, a soil compactor with an internal combustion engine is also covered by the concept according to the invention, which has the previously described inventive sensor or one of the variants described above.

Presentation of the invention

Other objects, advantages, features and applications of the present invention will become apparent from the following description of an embodiment with reference to the drawings. All described and / or illustrated features alone or in any meaningful combination form the subject matter of the present invention, also independent of their summary in the claims or their dependency. The invention will be explained with reference to an embodiment.

• 1 eine perspektivische Vorderansicht des erfindungsgemäßen Gebers in Stoppstellung mit zusätzlich teilweise schematischer Darstellung einer Verbrennungskraftmaschine sowie einer Baumaschine,
• 2 eine Seitenansicht des erfindungsgemäßen Gebers in Stoppstellung,
• 3 eine Rückansicht des erfindungsgemäßen Gebers in Stoppstellung,
• 4 eine geschnittene Vorderansicht des erfindungsgemäßen Gebers in Stoppstellung,
• 5 eine geschnittene Detailansicht des Hebels und des Gebergehäuses in Stoppstellung,
• 6 eine perspektivische Vorderansicht des erfindungsgemäßen Gebers in Leerlaufstellung,
• 7 eine geschnittene Vorderansicht des erfindungsgemäßen Gebers in Leerlaufstellung,
• 8 eine geschnittene Detailansicht des Hebels und des Gebergehäuses in Leerlaufstellung,
• 9 eine perspektivische Vorderansicht des erfindungsgemäßen Gebers in Vollgasstellung,
• 10 eine geschnittene Vorderansicht des erfindungsgemäßen Gebers in Vollgasstellung,
• 11 eine perspektivische Ansicht der in dem Geber vorgesehenen Rastvorrichtung.

Here are partly schematic:

• 1 a perspective front view of the encoder according to the invention in the stop position with additional partial schematic representation of an internal combustion engine and a construction machine,
• 2 a side view of the encoder according to the invention in the stop position,
• 3 a rear view of the encoder according to the invention in the stop position,
• 4 a sectional front view of the encoder according to the invention in the stop position,
• 5 a sectional detail view of the lever and the encoder housing in the stop position,
• 6 a perspective front view of the encoder according to the invention in neutral position,
• 7 a sectional front view of the encoder according to the invention in neutral position,
• 8th a sectional detail view of the lever and the encoder housing in idle position,
• 9 a perspective front view of the sensor according to the invention in full throttle position,
• 10 a sectional front view of the sensor according to the invention in full throttle position,
• 11 a perspective view of the provided in the encoder locking device.

Identical or equivalent components are provided in the figures of the drawing shown below with reference numerals in order to improve the readability.

1 shows the donor according to the invention 1 , for the mixture adjustment of an internal combustion engine 2 is used. The internal combustion engine 2 is in a construction machine 3 provided, which may be, for example, a soil compactor. At the dealer 1 is an actuator 4 provided, which is a lever 22 has, in the present example between a stop position 6 and a full throttle position 5 is pivotable. In the 1 is the stop position 6 shown in which the lever 22 in the extreme right position shown in the drawing. In comparison, the show 9 and 10 the full throttle position, at which the actuator 4 or the lever 22 located in the leftmost position shown in the drawings. Between the full throttle position 5 and the stop position 6 There is an idle position in the 6 . 7 . 8th and FIGS. 11 and 12 are shown.

The giver 1 has a transmitter housing 8th in which one as a rack 27 trained transmission element 9 is guided translationally. The transmission element 9 can directly with a mixture former 10 the internal combustion engine 2 mechanically connected, so that the translational movement of the rack 27 on the mixture former 10 is transmitted. The mixture former 10 changes depending on the position of the transmission element 9 the fuel-air mixture of the internal combustion engine 2 the construction machine 3 so that the speed or the power of the internal combustion engine changes.

10 shows a variant in which the transmission element 9 is connected to an actuating cable, the translational movement as a connecting element on the Gemischbildner 10 transfers. The control cable has a wire rope, which on the transmission element 9 and on the mixture former 10 is fixed. The wire rope is guided in a rigid casing so that a flexible installation of the cable is possible. The control cable can also be designed as a tension and compression cable, so that both tensile forces and compressive forces are transmitted.

The movement of the transmission element takes place as a translational movement, which extends along one in the 4 shown longitudinal extent 20 or associated axis. The transmission element 9 transmits both tensile and shear forces generated by the actuator 4 on the transmission element 9 caused.

The giver 1 also has at least two electrical conductors 14 . 15 on, which are connected in a manner not shown here with an igniter of the internal combustion engine, as soon as both conductors 14 . 15 at the dealer 1 electrically connected to each other, this causes in the ignition of the internal combustion engine 2 the interruption of the ignition, so that the internal combustion engine is stopped. To make this connection, the actuator 4 an electrically conductive section 34 on which at the electrical conductors 13 . 14 provided electrical contacts 38 . 39 connects with each other. This is in the stop position 6 given.

The giver 1 further includes a housing portion 48 in which a Kraftstoffabsperreinrichtung 11 is provided, which in series with a fuel supply 12 is switched.

The fuel supply 12 has, for example, hose nozzles as fastening elements for a fuel supply line (not shown), which of the fuel tank (not shown) of the internal combustion engine 2 to the mixture former 10 runs.

The 2 shows a side view of the encoder 1 in which the first electrical conductor 14 and the second electrical conductor 15 can be seen more clearly, the side in the form of a hose in the encoder housing 8th are introduced so that they are in contact with the first contact 38 and the second contact 39 for example, in 4 and 5 are shown, a contacting device 13 form the donor.

In the 3 , a rear view of the dealer 1 , is the lever 22 here in extreme left side given stop position 6 visible, noticeable. It is also shown that to the encoder housing 8th supplied electrical conductor 14 . 15 could also be provided in a receptacle located on the opposite side of the encoder housing 8th located. In particular, this further recording is mirror-symmetrical to the first recording, namely with respect to an axis of symmetry 19 (see. 4 ), which is approximately perpendicular to the longitudinal extent 20 of the transmission element 9 inside the encoder housing 8th and approximately perpendicular to a rotation axis 21 passes to the the actuator 4 or the lever 22 is pivotable.

In 4 can be seen that in relation to the aforementioned axis of symmetry 19 essential parts of the encoder housing 8th mirror-symmetrical to the axis of symmetry 19 are arranged. This includes a first entrance 16 through which the transmission element 9 is introduced and a second entrance 17 , in the present example by a screw-in 18 is closed. It is without Further possible, the screw 18 to remove, and the transmission element 9 from the other side, that is through the second entrance 17 into the encoder housing 8th introduce and with the actuator 4 connect to.

Connecting the actuator 4 with the transmission element 9 takes place in the present example by means of a gear 23 , which together with the actuator about the axis of rotation 21 rotates and rotatably with the lever 22 connected is. A gearing 24 of the gear 23 engages in a corresponding counter-toothing 25 the rack 27 a, and thus converts a rotational movement of the gear 23 passing through a swivel path 46 taking place lever movement 26 of the lever 22 on the gear 23 is imprinted, in a translational movement along the longitudinal extent 20 of the encoder housing 8th or the transmission element 9 ,

The lever 22 is in particular with his leading section 34 so through the axis of rotation 21 that led the electrically conductive section 34 at one approximately parallel to the swivel path 46 located, associated wall 35 slides. In the electrically conductive section 34 of the lever 22 is a slider 36 provided, which by means of a Gleitstückfeder 37 that are inside the lever 22 supported, against the associated wall 35 is pressed. The slider 36 For example, materials such as carbon, sintered bronze or brass, or any other suitable material, may be made to stop 6 a particularly good electrical connection between the first contact 38 and the second contact 39 manufacture. In 5 is shown that the contacts 38 and 39 with barbs 52 are provided, which the contacts immobile with the encoder housing 8th connect. The contacts are either in the encoder housing 8th poured or in the for the contacts 38 , 39 provided recesses glued. The electrically conductive contacts 38,39 consist in the variant shown are made of brass, which is tinned to the environment exposed surface.

The slider 36 is by a slider spring 37 along an approximately perpendicular to the wall 35 extending Gleitstückachse 51 biased.

On the other hand, that's the same thing 36 designed so that a rubbing wear between the wall 35 and the slider 36 is minimized. On the one hand serves an advantageous material pairing between the slider 36 and the encoder housing 8th , which may consist of polyamide 66 with 30% glass fiber content. Further, the edges of the end face of the slider 36 beveled by a phase or a radius to minimize the present abrasion.

On the transmission element 9 is on the opposite side of the gearing 24 the rack 27 a control surface 28 provided, which in operative connection with a cam 30 a valve 29 the fuel shut-off device 11 stands. The control area 28 has a recess, which is an entry of the cam 30 allowed in this recess when the transmission element 9 along the extension direction 20 is moved. In the in 4 shown position, the stop position 6 , lies the cam 30 on a hidden section of the rack 9 or the control surface 28 on and close the valve 29 in order to. The valve 29 exercises a restoring force 31 in the valve opening direction 32 along the axis 19 in the direction of the transmission element. Once the transmission element 9 is moved and the control surface 28 a hub of the cam 30 releases, ensures the restoring force 31 for making the valve 29 opens. The restoring force 31 is through one in the valve 29 provided valve spring 49 Applied to the bottom of the housing section 48 supported and to a valve spool 53 attacks. On the valve spool 53 are sealing rings 50 provided, which the fuel-carrying area of the valve or the housing portion 48 Seal against the outside area.

In the 7 the condition is visible when idling 7 the cam 30 the stroke in the valve opening direction 32 has executed. When transferring the lever 22 back to the stop position 6 , passes over the control surface 28 the cam 30 such that the cam counter to the restoring force 31 in valve closing direction 33 and along the axis 19 is returned to a closed position.

In 7 is also seen that the first contact 38 and the second contact 39 lie freely, so no electrical connection between these contacts through the electrically conductive area 34 on the lever 22 consists. Thus, it is possible that the internal combustion engine is idling. The transmission element 9 is a small piece along the length 20 translationally shifted in the drawing to the right, so that the Gemischbildner 10 , which may be a carburetor, provides a fuel-air mixture for idling operation.

In the 8th is also seen that the slider 36 on an area of the wall 35 rests, free of the electrical contacts 38 and 39 is. In 9 is the full throttle position of the encoder 1 visible, noticeable. In the sectional view in 10 you can tell that the transmission element 9 is transferred to the extreme right position so that the Gemischbildner 10 brought into full throttle operation. The valve 29 is still open to a sufficient fuel flow to the mixture former 10 to ensure.

In the 10 It can also be seen that the lever 22 in the extreme left position is also in the recesses for contacts 38 and 39 are provided. However, these are empty in the present case and only on the encoder housing 8th provided because the associated mold is designed to be universal and symmetrical.

In 11 is a locking device recognizable, the different locking positions 40 pretending which each of the full throttle position 5 , the stop position 6 and the idle position 7 assigned. For this purpose, the latching device has a latching mechanism 41 on, a plate spring 42 contains. This plate spring 42 is arranged on the axis of rotation and rotates together with the gear 23 as well as the lever 22 , The plate spring 42 is on a cover of the actuator 4 axially supported. The locking device has a together with the actuator 4 rotating driver 43 on, in which a locking element 44 , in particular a ball, is received, which in breakthroughs 47 a detent segment shown in detail 45 optionally receivable. The rest segment 45 extends substantially along the pivot path 46 of the lever 22 and is immovable relative to the encoder housing 8th on the encoder housing 8th attached. A pivoting of the lever 22 ensures that the diaphragm spring 42 together with the driver 43 and the locking element 44 over the rest segment 45 moves and the locking element 44 in the assigned positions under the influence of the disc spring 42 applied, elastic force in the openings 47 is recorded.

LIST OF REFERENCE NUMBERS

1

giver

2

Internal combustion engine

3

Construction machinery

4

actuator

5

Full throttle

6

stop position

7

Neutral

8th

encoder housing

9

transmission element

10

Gemischbildner

11

Kraftstoffabsperreinrichtung

12

Fuel supply

13

contacting

14

first electrical conductor

15

second electrical conductor

16

first entrance

17

second entrance

18

screw-in bolt

19

axis of symmetry

20

longitudinal extension

21

axis of rotation

22

lever

23

gear

24

gearing

25

counter teeth

26

lever movement

27

rack

28

control surface

29

Valve

30

cam

31

Restoring force

32

Valve opening direction

33

Valve closing direction

34

section

35

wall

36

slide

37

slider spring

38

first contact

39

second contact

40

detent positions

41

detent mechanism

42

Belleville spring

43

takeaway

44

locking element

45

Rest segment

46

pivot path

47

breakthrough

48

housing section

49

valve spring

50

seal

51

Gleitstückachse

52

barb

53

valve slide

Claims (26)

Encoder (1) for the mixture adjustment of an internal combustion engine (2), in particular in a construction machine (3), preferably in a soil compactor, with a manually adjustable actuator (4), which between a full throttle position (5), a stop position (6) and an intermediate Neutral position (7) on a transmitter housing (8) is movably guided, wherein the actuator (4) is in operative connection with a transmission element (9) for transmitting the desired position to a Gemischbildner (10) of the internal combustion engine (2), and with a mechanical operable Kraftstoffabsperreinrichtung (11) for opening or closing a fuel supply (12) for the internal combustion engine (2) and with an electrical contacting means (13) for switching an ignition device with an internal combustion engine (2) connectable electrical circuit, characterized in that the encoder housing ( 8) with two inputs (16, 17) for insertion is formed of the transmission element, and in that the electrical contacting device (13) has at least two electrically conductive contacts (38, 39) which are electrically connectable to each other by means of a provided on the actuator (4) portion (34) for switching the contacting device (13) , Encoder (1) to Claim 1 , characterized in that the inputs (16, 17) are formed at least partially closable, in particular by screw-in bolt (18). Donor (1) after one of Claims 1 or 2 , characterized in that the inputs (16, 17) face each other, preferably mirror-symmetrical to each other, in particular mirror-symmetrical with respect to an axis of symmetry (19), which is approximately perpendicular to a longitudinal extent (20) of the transmission element (9) within the encoder housing (8) and about perpendicular to a rotation axis (21) of the actuator (4). Encoder (1) for the mixture adjustment of an internal combustion engine (2), in particular in a construction machine (3), preferably in a soil compactor, with a manually adjustable actuator (4), which between a full throttle position (5), a stop position (6) and an intermediate Neutral position (7) on a transmitter housing (8) is movably guided, wherein the actuator (4) is in operative connection with a transmission element (9) for transmitting the desired position to a Gemischbildner (10) of the internal combustion engine (2), and with a mechanical operable Kraftstoffabsperreinrichtung (11) for opening or closing a fuel supply (12) for the internal combustion engine (2) and with an electrical contacting means (13) for switching an ignition device with an internal combustion engine (2) connectable electrical circuit, characterized in that the electrical contacting device (13) at least two elektri sch conducting contacts (38, 39), which are electrically connected to one another by means of a provided on the actuator (4) portion (34) for switching the contacting device (13) and the contacting device (13) in the encoder housing (8) is integrated. Encoder (1) according to one of the preceding claims, characterized in that the actuator (4) has a pivotable about a rotation axis (21) lever (22). Encoder (1) to Claim 5 , characterized in that the actuator (4) has a toothed wheel (23) which performs a rotation upon pivoting of the lever (22) and with its toothing (24) in a counter-toothing (25) of the transmission element (9) for transmitting a lever movement (26) engages the transmission element (9). Encoder (1) to Claim 6 , characterized in that the transmission element (9) is designed as a rack (27). Encoder (1) according to one of the preceding claims, characterized in that the transmission element (9) has a control surface (28) which is in mechanical operative connection with the fuel shut-off device (11). Sensor (1) according to one of the preceding claims, characterized in that the Kraftstoffabsperreinrichtung (11) has a valve (29), in particular slide valve, which is in operative connection with the actuator (4). Encoder (1) after the Claims 8 and 9 , characterized in that the valve (29) with a cam (30) in operative connection with the control surface (28) of the transmission element, so that the valve (29) against an elastic restoring force (31), in particular in the valve opening direction (32), by the action of the control surface (28) on the cam (30) is actuated. Encoder (1) according to any one of the preceding claims, characterized in that at least one electrically conductive portion (34) of the actuator (4) rubbing on the encoder housing (8), in particular on an associated wall (35) slides. Encoder (1) to Claim 11 , characterized in that on the encoder housing (8) sliding portion of the actuator (4) is formed as a in the actuator (4) at least partially recessed slider (36). Encoder (1) to Claim 12 , characterized in that the slider (36) is held in the actuator (4) under a resilient bias against the encoder housing (8). Donor (1) after one of Claims 11 to 13 , characterized in that the portion (34) or the slider (36) contains brass, sintered bronze and / or carbon, or consists of brass, sintered bronze and / or carbon. Encoder (1) according to one of the preceding claims, characterized in that the electrically conductive contacts in the encoder housing (8) are preferably not embedded, in particular glued or embedded. Encoder (1) according to one of the preceding claims, characterized in that the actuator (4) is moved out of the respective position (5, 6, 7) by overcoming a contact resistance formed by positive locking or frictional engagement and can be transferred to the respective next desired position. Encoder (1) to Claim 16 , characterized in that the desired positions (5, 6, 7) discrete locking positions (40) are assigned. Donor (1) after one of Claims 16 or 17 , characterized in that the encoder (1) has a latching mechanism (41), preferably a ball catch for forming the contact resistance. Encoder (1) to Claim 5 and 18 , characterized in that the latching mechanism (41) has a disk spring (42) rotatable about the rotation axis (21) and a driver (43) into which a latching element (44), preferably a ball, is accommodated, wherein the plate spring (42) the latching element (44) with an elastic force against a rotationally fixed to the encoder housing (8) provided latching segment (45) biases. Encoder (1) to Claim 19 , characterized in that latching segment (45) along the pivot path (46) of the lever (22), preferably arcuately extending and along this pivot path (46) has at least one receptacle or opening (47) for engaging the locking element (44). Encoder (1) according to one of the preceding claims, characterized in that the Kraftstoffabsperreinrichtung (11) in a housing connected to the encoder (8) housing portion (48) is arranged. Encoder (1) to Claim 21 , characterized in that the housing portion (48) of the Kraftstoffabsperreinrichtung (11) with respect to the encoder housing (8) is rotatably arranged. Sensor (1) according to one of the preceding claims, characterized in that both the actuation of the Kraftstoffabsperreinrichtung (11) and the switching of the contacting device (13) is associated with the transfer of the actuator (4) in an operating position of the actuator (4). Encoder (1) to Claim 23 , characterized in that the closing of the Kraftstoffabsperreinrichtung (11) and the connection of the electrical conductors (13, 14) is associated with an actuating position of the actuator (4). Donor (1) after one of Claims 23 or 24 , characterized in that the opening of the Kraftstoffabsperreinrichtung (11) and the separation of the electrical conductors (13, 14) when leaving an actuating position of the actuator (4). Encoder (1) according to one of the preceding Claims 23 to 25 , characterized in that the encoder housing (8) has two inputs (16, 17) through which the transmission element (9) can be passed.

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