EP1511925A1 - Tensing device - Google Patents

Tensing device

Info

Publication number
EP1511925A1
EP1511925A1 EP03735398A EP03735398A EP1511925A1 EP 1511925 A1 EP1511925 A1 EP 1511925A1 EP 03735398 A EP03735398 A EP 03735398A EP 03735398 A EP03735398 A EP 03735398A EP 1511925 A1 EP1511925 A1 EP 1511925A1
Authority
EP
European Patent Office
Prior art keywords
actuator
clamping device
traction
support body
internal combustion
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.)
Withdrawn
Application number
EP03735398A
Other languages
German (de)
French (fr)
Inventor
Ulrich Grau
Frank Himsel
Michael Bogner
Thomas Kraft
Rudolf Berger
Gerhard Maas
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.)
IHO Holding GmbH and Co KG
Original Assignee
INA Schaeffler KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by INA Schaeffler KG filed Critical INA Schaeffler KG
Publication of EP1511925A1 publication Critical patent/EP1511925A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1254—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means
    • F16H7/1281—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley without vibration damping means where the axis of the pulley moves along a substantially circular path
    • 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
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0802—Actuators for final output members
    • F16H2007/0823—Electric actuators

Definitions

  • the present invention relates to a tensioning device for a traction mechanism drive, with which various units, such as the water pump, the starter generator, the injection pump or an air conditioning compressor, are driven starting from the crankshaft of the internal combustion engine.
  • the tensioning device comprises a support body which is arranged pivotably about an axis of rotation.
  • a rotatable tensioning roller is positioned on the support body and is supported directly on the traction means, in particular a belt.
  • the individual units of the internal combustion engine such as, for example, water pump, air conditioning compressor, starter generator, power steering pump, are driven starting from the crankshaft or its pulleys.
  • the traction means in particular a belt, connects from the pulley of the crankshaft, all other pulleys including the traction mechanism drive of individual units.
  • the tensioning device has the task of automatically ensuring the pretensioning of the traction device as constant as possible.
  • Traction drive which also include the drive of a starter generator, require regardless of the operating mode of the internal combustion engine, i. H. An effective pre-tensioning force of the traction device both for the starting process and when the internal combustion engine is running.
  • the starter generator which works as an electric motor, takes over the function of the traction drive.
  • generator operation of the starter generator sets in, which supplies the electrical system of the motor vehicle with electrical energy.
  • a torque is introduced into the traction means by the starter generator or the internal combustion engine. Consequently, between the operating mode there is a change of the empty run and the pull run or a change of the torque direction in the traction means run between the pulleys of the crankshaft and the starter generator.
  • a traction mechanism drive is known from the patent JP 105 9555 A, which includes the drive of a starter generator.
  • the known traction mechanism drive comprises two automatically acting tensioning devices.
  • a first tensioning device is supported with a tensioning roller on the traction means strand between the pulleys of the crankshaft and the starter generator.
  • the tensioning roller of the second tensioning device is supported on the traction means strand in a section downstream of the starter generator.
  • the structure provides that the first tensioning device can be blocked in the start mode in order to achieve a pretensioned traction means between the starter generator and the pulley of the crankshaft.
  • the double arrangement of the clamping devices requires an increased installation space, which is not available in particular in small-volume internal combustion engines. Furthermore, the double arrangement of clamping devices increases the costs and the installation effort and thus largely compensates for the savings effect of the starter generator, which combines the generator and starter units.
  • the object of the invention is to always take into account the disadvantages of the known solution with only one tensioning device, regardless of the operating mode of the internal combustion engine, to ensure an optimal pre-tensioning force of the traction means.
  • a tensioning device is provided according to the invention according to claim 1, which comprises a support body which is pivotable about an axis of rotation.
  • a roller-mounted tensioning roller is positioned on the support body.
  • the adjustment of the tensioning device in order to influence the pretensioning force of the traction device is carried out exclusively via an electronic actuator.
  • the actuator is spaced from the axis of rotation of the clamping device, articulated on the supporting body and ensures an exact adjustment of the clamping device.
  • a method is provided to solve the problem, in which a support body provided for receiving the tensioning roller takes place as a function of at least one operating parameter of the traction means and / or the internal combustion engine.
  • a controllable actuator is preferably a linear actuator, which can also be referred to as an actuator.
  • a preferred construction of the actuator comprises an electrically driven threaded spindle or alternatively a ball screw
  • the invention further includes a hydraulically or pneumatically acting actuator.
  • the tensioning device can be adjusted by means of an electro-magnetic or an electro-hydraulic actuator
  • a further advantageous arrangement according to the invention comprises a joint or an intermediate element which is inserted between the actuator or the actuator and the supporting body of the tensioning device.
  • This measure enables a power transmission or a relocated arrangement of the actuator from the tensioning device, which is suitable, for example, for narrow installation spaces of the traction mechanism drive.
  • the construction of the tensioning device according to the invention can include a toggle lever which connects the actuator, in particular a threaded spindle to the supporting body of the tensioning device.
  • a stop is preferably assigned to the toggle lever in order to achieve a defined end position.
  • the toggle lever serves to relieve the electric motor the toggle lever is used for smaller sized internal combustion engines
  • an electric motor is advantageously used, which carries out the adjustment of the tensioning device, i.e. the supporting body and the tensioning roller.
  • the invention includes a force-dependent control or activation of the actuator or the actuator.
  • a force measuring roller connected to the traction means is suitable
  • a further embodiment of the invention provides that the control or activation of the actuator takes place as a function of at least one operating parameter of the traction mechanism drive.
  • the electronically controlled actuator can According to the invention in connection with suitable control electronics of the internal combustion engine or a motor management, the tensioning device can be adjusted, for example, depending on the generator power, the pretensioning force of the traction means, the direction of action of the torque in the traction means or the speed of a pulley of the traction means drive, by the pretensioning force of the traction means to influence
  • a largely constant pretension of the traction means can be achieved according to the invention in that a holding current or a restoring torque of the electric motor used for activating the actuator is continuously recorded and, depending on these operating parameters, the effective range of the electronically controlled actuator is changed
  • the electronically controlled or electronically controllable actuator enables a constant pre-tensioning of the traction means, regardless of whether the traction means is elongated due to wear, for example.
  • an optimum between the lowest wear and high power transmission between the traction means and the units to be driven can be achieved
  • the traction element preload can be set continuously, for example between an operating position and a neutral position, with the electronically controlled actuator
  • the electronically controlled actuator which is preferably connected to control electronics of the internal combustion engine, enables the tensioning device to be pivoted, for example, in the starting mode of the internal combustion engine, into a position that increases the pretensioning force of the traction means to avoid slippage of the crankshaft and thus start deceleration.
  • the tensioning device according to the invention is therefore preferably arranged between the pulleys of the crankshaft and the starter generator.
  • the electronically controlled actuator according to the invention further enables the support body and consequently the tensioning pulley connected to it to pivot automatically into a position corresponding to the starting position when the internal combustion engine is at a standstill.
  • control electronics can be designed such that, in the starting phase, synchronously with the starting process of the internal combustion engine, the electronically controlled actuator pivots the supporting body and the tensioning roller connected therewith into the corresponding starting position.
  • Figure 1 shows the schematic structure of a traction drive, provided with a tensioning device according to the invention
  • Figure 2 shows an enlarged view of the invention
  • FIG. 1 shows a traction mechanism drive 1, which is designed as a so-called unit drive and is provided for driving various units of an internal combustion engine.
  • a traction means 2 preferably a belt or a toothed belt, connects the pulleys of the individual units.
  • the traction mechanism drive 1 is driven by the crankshaft 3 or its pulley, the traction mechanism 2 enclosing the pulleys of the air conditioning compressor 4, the water pump 5, the power steering pump 6 and the starter generator 7.
  • a clamping device 8a is assigned to the traction means 2 between the starter generator 7 and the crankshaft 3.
  • the tensioning device 8a comprises a support body 9a, on which a tensioning roller 10 is rotatably arranged, which is supported directly on the traction means 2.
  • the support body 9a can be pivoted about an axis of rotation 11, which is preferably on a crankcase of the internal combustion engine (not shown in FIG. 1)
  • the tensioning device 8a is adjusted exclusively via an actuator 12a.
  • an electronically controlled or electronically controllable actuator 12a which can also be referred to as an actuator, is provided.
  • FIG. 1 shows a linearly acting actuator 12a provided with a Threaded spindle 13, which is driven by an electric motor 14.
  • the adjusting nut 15, which can be displaced linearly on the threaded spindle 13, is connected to the supporting body 9a via an articulated intermediate member 16.
  • a link 17 serves for this purpose, which is on the respective end sides of the supporting body 9a and Lock nut 15 is articulated
  • a linear movement of the adjusting nut 15, indicated by the double arrow, causes the tensioning device 8a to pivot about the axis of rotation 11, as a result of which the pretensioning force of the traction means 2 is influenced
  • the electric motor 14 is advantageously coupled to the motor controller 18, so that, for example, depending on the operating mode, ie between the starting phase and the running internal combustion engine, the pretensioning force of the traction means can be influenced.
  • the adjustment of the actuator 12a can also be dependent on at least one parameter of the Traction drive 1 are influenced for this purpose, an electronic system 19 is provided, which interacts, for example, with a sensor 20 integrated in the starter generator 7 or assigned to the starter generator 7 Influencing the pre-tension of the traction device 2 as a function of predetermined limit values.
  • the electronic system 19 can also be supplemented with additional sensors with which the traction device Force or the speed of a pulley can be monitored to always ensure an optimal preload of the traction device 2.
  • a torque from the crankshaft 3 or the starter generator 7 is introduced into the traction means 2 via the associated pulleys. This is associated with a change in the empty run and the pull run or the torque direction in the traction means run between the starter generator 7 and the crankshaft 3.
  • the tensioning device 8a is shifted via the actuator 12a into a position which increases the pretensioning force of the traction means 2 in order to achieve a delay-free start of the internal combustion engine, i. H.
  • the starting position illustrates the position of the tensioning roller 10 shown in dotted lines.
  • the actuator 12a is actuated in such a way that it displaces the tensioning device 8a into a position reducing the pretensioning force of the traction means 2.
  • FIG. 2 shows details of the traction mechanism drive 1 on an enlarged scale.
  • the tensioning device 8b shows a support body 9b, the axis of rotation 11 of which is arranged at a greater distance from the articulation point of the actuator 12b, in comparison to the tensioning device 8a according to FIG To change the pre-tensioning force of the traction device.
  • the actuator 12b is arranged between the pulley of the crankshaft 3 and the starter generator 7 in an optimized space.
  • the adjusting nut 15 of the actuator 12b also forms a joint 21 directly with the support body 9b.
  • the formation and arrangement of the actuator 12b is particularly suitable for small-volume internal combustion engines in which the available space is limited. reference numerals
  • Starter generator a tensioning device b tensioning device a supporting body b supporting body 0 tensioning roller 1 axis of rotation 2a actuator 2b actuator 3 threaded spindle 4 electric motor 5 adjusting nut 6 intermediate link 7 bracket 8 motor control 9 electronic system 0 sensor 1 joint

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

The invention relates to a tensing device (8a) for a traction mechanism drive (1) comprising the drive of a starter generator (7). Regulation of the tensing device (8a) occurs exclusively by means of an electronically regulated actuator (12a).

Description

Spannvorrichtung jig
Die vorliegende Erfindung betrifft eine Spannvorrichtung für einen Zugmitteltrieb, mit dem ausgehend von der Kurbelwelle der Brennkraftmaschine verschiedene Aggregate, wie beispielsweise die Wasserpumpe, der Startergenerator, die Einspritzpumpe oder ein Klimakompressor angetrieben werden. Die Spannvorrichtung umfasst einen Tragkörper, der um eine Drehachse schwenk- bar angeordnet ist. An dem Tragkörper ist eine verdrehbare Spannrolle positioniert, die unmittelbar an dem Zugmittel, insbesondere einem Riemen, abgestützt ist.The present invention relates to a tensioning device for a traction mechanism drive, with which various units, such as the water pump, the starter generator, the injection pump or an air conditioning compressor, are driven starting from the crankshaft of the internal combustion engine. The tensioning device comprises a support body which is arranged pivotably about an axis of rotation. A rotatable tensioning roller is positioned on the support body and is supported directly on the traction means, in particular a belt.
Bei dem sogenannten Aggregate-Zugmitteltrieb werden die einzelnen Aggre- gate der Brennkraftmaschine, wie beispielsweise Wasserpumpe, Klimakompressor, Startergenerator, Lenkhilfspumpe von der Kurbelwelle bzw. dessen Riemenscheiben ausgehend angetrieben. Das Zugmittel, insbesondere ein Riemen, verbindet dabei von der Riemenscheibe der Kurbelwelle ausgehend, alle übrigen den Zugmitteltrieb einschließenden Riemenscheiben einzelner Aggregate. Große Zugmittellängen sowie die Drehungleichförmigkeit der Kurbelwelle, bedingt durch den Verbrennungsprozess der Brennkraftmaschine, verursachen dynamische Effekte, insbesondere nachteilige Schwingungen, die sich auf den Zugmitteltrieb übertragen und folglich die Lebensdauer des Zugmittels beeinflussen. Weiterhin stellt sich eine temperaturbedingte Verände- rung des Zugmittelmaterials ein, wodurch sich die Vorspannkraft des Zugmittels, die Riemenvorspannung, insbesondere bei hohen und tiefen Grenztemperaturen ändert. Alterung und Verschleiß führt bei Zugmitteln, Riemen, zu einer Längung, so dass sich die im Neuzustand eingestellte Vorspannkraft verringert. Zur Erzielung einer ausreichenden Vorspannkraft, unabhängig vom Einsatzort der Brennkraftmaschine sowie vom Verschleißzustand des Zugmittels hat die Spannvorrichtung die Aufgabe, selbsttätig eine möglichst gleichbleibende Vorspannung des Zugmittels zu gewährleisten.In the so-called aggregate traction drive, the individual units of the internal combustion engine, such as, for example, water pump, air conditioning compressor, starter generator, power steering pump, are driven starting from the crankshaft or its pulleys. The traction means, in particular a belt, connects from the pulley of the crankshaft, all other pulleys including the traction mechanism drive of individual units. Large traction means lengths and the rotational irregularity of the crankshaft, caused by the combustion process of the internal combustion engine, cause dynamic effects, in particular disadvantageous vibrations, which are transmitted to the traction mechanism drive and consequently influence the service life of the traction mechanism. Furthermore, a temperature-related change in the traction material arises, as a result of which the pretensioning force of the traction device and the belt pretension change, in particular at high and low limit temperatures. With traction devices and belts, aging and wear cause elongation, so that the pre-tensioning force that is set when new is reduced. In order to achieve a sufficient pretensioning force, regardless of the place of use of the internal combustion engine and the state of wear of the traction device, the tensioning device has the task of automatically ensuring the pretensioning of the traction device as constant as possible.
Zugmitteltriebe, die auch den Antrieb eines Startergenerators einschließen, erfordern unabhängig vom Betriebsmodus der Brennkraftmaschine, d. h. sowohl für den Startvorgang als auch bei laufender Brennkraftmaschine, eine wirksame Vorspannkraft des Zugmittels. Während des Startvorgangs über- nimmt der als Elektromotor arbeitende Startergenerator die Funktion des Zugmittelantriebs. Unmittelbar nach dem Start der Brennkraftmaschine bzw. bei laufender Brennkraftmaschine stellt sich ein Generatorbetrieb des Startergenerators ein, der das Bordnetz des Kraftfahrzeugs mit elektrischer Energie versorgt. Abhängig von dem Betriebsmodus der Brennkraftmaschine wird ein Drehmoment von dem Startergenerator oder der Brennkraftmaschine in das Zugmittel eingeleitet. Folglich stellt sich zwischen dem Betriebsmodus gleichzeitig ein Wechsel des Leertrums und des Zugtrums bzw. ein Wechsel der Drehmomentrichtung in dem Zugmitteltrum zwischen den Riemenscheiben der Kurbelwelle und des Startergenerators ein.Traction drive, which also include the drive of a starter generator, require regardless of the operating mode of the internal combustion engine, i. H. An effective pre-tensioning force of the traction device both for the starting process and when the internal combustion engine is running. During the starting process, the starter generator, which works as an electric motor, takes over the function of the traction drive. Immediately after the start of the internal combustion engine or when the internal combustion engine is running, generator operation of the starter generator sets in, which supplies the electrical system of the motor vehicle with electrical energy. Depending on the operating mode of the internal combustion engine, a torque is introduced into the traction means by the starter generator or the internal combustion engine. Consequently, between the operating mode there is a change of the empty run and the pull run or a change of the torque direction in the traction means run between the pulleys of the crankshaft and the starter generator.
Aus dem Patent JP 105 9555 A ist ein Zugmitteltrieb bekannt, der den Antrieb eines Startergenerators einschließt. Zur Realisierung einer ausreichenden Vorspannkraft des Zugmittels sowohl im Startbetrieb als auch bei laufender Brennkraftmaschine, umfasst der bekannte Zugmitteltrieb zwei selbsttätig wir- kende Spannvorrichtungen ein. Eine erste Spannvorrichtung stützt sich mit einer Spannrolle an dem Zugmitteltrum zwischen den Riemenscheiben der Kurbelwelle und des Startergenerators ab. Die Spannrolle der zweiten Spannvorrichtung ist in einem dem Startergenerator nachgeordπeten Abschnitt an dem Zugmitteltrum abgestützt. Der Aufbau sieht vor, dass beim Startmodus die erste Spannvorrichtung blockierbar ist, zur Erzielung eines vorgespannten Zugmittels zwischen dem Startergenerator und der Riemenscheibe der Kurbelwelle. Bei laufender Brennkraftmaschine wird die Verriegelung gelöst, so dass sich die am Zugmittel geführte Laufrolle der Spannvorrichtung verlagert. Die doppelte Anordnung der Spannvorrichtungen erfordert einen vergrößerten Bauraum, der insbesondere bei kleinvolumigen Brennkraftmaschinen nicht vorhanden ist. Weiterhin erhöht die doppelte Anordnung von Spannvorrichtungen die Kosten und den Montageaufwand und gleicht damit weitestgehend den Einspa- reffekt des Startergenerators aus, der die Aggregate Generator und Starter vereint.A traction mechanism drive is known from the patent JP 105 9555 A, which includes the drive of a starter generator. In order to achieve a sufficient pretensioning force of the traction mechanism both in starting operation and when the internal combustion engine is running, the known traction mechanism drive comprises two automatically acting tensioning devices. A first tensioning device is supported with a tensioning roller on the traction means strand between the pulleys of the crankshaft and the starter generator. The tensioning roller of the second tensioning device is supported on the traction means strand in a section downstream of the starter generator. The structure provides that the first tensioning device can be blocked in the start mode in order to achieve a pretensioned traction means between the starter generator and the pulley of the crankshaft. When the internal combustion engine is running, the lock is released so that the roller of the tensioning device guided on the traction device is displaced. The double arrangement of the clamping devices requires an increased installation space, which is not available in particular in small-volume internal combustion engines. Furthermore, the double arrangement of clamping devices increases the costs and the installation effort and thus largely compensates for the savings effect of the starter generator, which combines the generator and starter units.
Zusammenfassung der ErfindungSummary of the invention
Aufgabe der Erfindung ist es, die Nachteile der bekannten Lösung berücksichtigend mit nur einer Spannvorrichtung unabhängig vom Betriebsmodus der Brennkraftmaschine stets eine optimale Vorspannkraft des Zugmittels zu gewährleisten.The object of the invention is to always take into account the disadvantages of the known solution with only one tensioning device, regardless of the operating mode of the internal combustion engine, to ensure an optimal pre-tensioning force of the traction means.
Zur Lösung dieser Problemstellung ist gemäß der Erfindung nach Anspruch 1 eine Spannvorrichtung vorgesehen, die einen Tragkörper umfasst, der um eine Drehachse schwenkbar ist. An dem Tragkörper ist eine wälzgelagerte Spannrolle lagepositioniert. Die Verstellung der Spannvorrichtung, um die Vorspannkraft des Zugmittels zu beeinflussen, erfolgt ausschließlich über ein elektronisches Stellglied. Damit kann in jedem Betriebszustand der Tragkörper nachgeführt und damit verstellt werden. Das Stellglied ist dabei zu der Drehachse der Spannvorrichtung beabstandet, an dem Tragkörper angelenkt und gewährleistet eine exakte Verstellung der Spannvorrichtung.To solve this problem, a tensioning device is provided according to the invention according to claim 1, which comprises a support body which is pivotable about an axis of rotation. A roller-mounted tensioning roller is positioned on the support body. The adjustment of the tensioning device in order to influence the pretensioning force of the traction device is carried out exclusively via an electronic actuator. In this way, the support body can be tracked and adjusted in any operating state. The actuator is spaced from the axis of rotation of the clamping device, articulated on the supporting body and ensures an exact adjustment of the clamping device.
Gemäß Anspruch 17 ist zur Lösung der Problemstellung ein Verfahren vorgesehen, bei dem ein zur Aufnahme der Spannrolle vorgesehener Tragkörper in Abhängigkeit von zumindest einem Betriebsparameter des Zugmittels und/oder der Brennkraftmaschine erfolgt.According to claim 17, a method is provided to solve the problem, in which a support body provided for receiving the tensioning roller takes place as a function of at least one operating parameter of the traction means and / or the internal combustion engine.
Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der abhängigen Ansprüche 2 bis 16. Als ansteuerbares Stellglied bietet sich vorzugsweise ein linear wirkendes, auch als Aktor zu bezeichnendes Stellglied an Ein bevorzugter Aufbau des Stellgliedes umfasst eine elektrisch angetriebene Gewindespindel oder alternativ eine KugelgewindespindelAdvantageous embodiments of the invention are the subject of dependent claims 2 to 16. A controllable actuator is preferably a linear actuator, which can also be referred to as an actuator. A preferred construction of the actuator comprises an electrically driven threaded spindle or alternatively a ball screw
Alternativ schließt die Erfindung weiterhin ein hydraulisch oder pneumatisch wirkendes Stellglied ein Weiterhin kann gemäß der Erfindung die Spannvorrichtung mittels eines elektro-magnetischen oder eines elektro-hydrauhschen Stellgliedes verstellt werdenAlternatively, the invention further includes a hydraulically or pneumatically acting actuator. Furthermore, according to the invention, the tensioning device can be adjusted by means of an electro-magnetic or an electro-hydraulic actuator
Eine weitere vorteilhafte Anordnung gemäß der Erfindung umfasst ein Gelenk oder ein Zwischenglied, welches zwischen dem Stellglied, oder dem Aktor und dem Tragkorper der Spannvorrichtung eingesetzt ist Diese Maßnahme ermöglicht eine Kraftubersetzung bzw eine verlagerte Anordnung des Stellgliedes von der Spannvorrichtung, die sich beispielsweise für enge Bauraume des Zugmitteltriebs eignet Weiterhin kann der erfindungsgemaße Aufbau der Spannvorrichtung einen Kniehebel einschließen, der das Stellglied, insbesondere eine Gewindespindel mit dem Tragkorper der Spannvorrichtung verbindet Vorzugsweise ist dem Kniehebel zur Erzielung einer definierten Endlage ein Anschlag zugeordnet Des Weiteren dient der Kniehebel zur Entlastung des Elektromotors Weiterhin eignet sich der Kniehebel zum Einsatz für kleiner dimensionierte BrennkraftmaschinenA further advantageous arrangement according to the invention comprises a joint or an intermediate element which is inserted between the actuator or the actuator and the supporting body of the tensioning device.This measure enables a power transmission or a relocated arrangement of the actuator from the tensioning device, which is suitable, for example, for narrow installation spaces of the traction mechanism drive. Furthermore, the construction of the tensioning device according to the invention can include a toggle lever which connects the actuator, in particular a threaded spindle to the supporting body of the tensioning device. A stop is preferably assigned to the toggle lever in order to achieve a defined end position. Furthermore, the toggle lever serves to relieve the electric motor the toggle lever is used for smaller sized internal combustion engines
Zur Aktivierung des Stellgliedes ist vorteilhaft ein Elektromotor eingesetzt, der die Verstellung der Spannvorrichtung, d h des Tragkorpers und der Spannrolle vornimmt Alternativ schließt die Erfindung eine kraftabhangige Steuerung bzw Aktivierung des Stellgliedes oder des Aktors ein Dazu eignet sich insbesondere eine mit dem Zugmittel in Verbindung stehende KraftmessrolleTo activate the actuator, an electric motor is advantageously used, which carries out the adjustment of the tensioning device, i.e. the supporting body and the tensioning roller. Alternatively, the invention includes a force-dependent control or activation of the actuator or the actuator. In particular, a force measuring roller connected to the traction means is suitable
Eine weitere Ausgestaltung der Erfindung sieht vor, dass die Ansteuerung bzw Aktivierung des Stellgliedes in Abhängigkeit von zumindest einem Betriebsparameter des Zugmitteltriebs erfolgt Das elektronisch geregelte Stellglied kann erfmdungsgemaß in Verbindung mit einer geeigneten Steuerelektronik der Brennkraftmaschine oder einem Motormanagement erfolgen Die Spannvorrichtung ist damit beispielsweise in Abhängigkeit der Generatorleistung, der Vorspannkraft des Zugmittels, der Wirkrichtung des Drehmomentes im Zug- mittel oder der Drehzahl einer Riemenscheibe des Zugmitteltriebs verstellbar, um die Vorspannkraft des Zugmittels zu beeinflussenA further embodiment of the invention provides that the control or activation of the actuator takes place as a function of at least one operating parameter of the traction mechanism drive. The electronically controlled actuator can According to the invention in connection with suitable control electronics of the internal combustion engine or a motor management, the tensioning device can be adjusted, for example, depending on the generator power, the pretensioning force of the traction means, the direction of action of the torque in the traction means or the speed of a pulley of the traction means drive, by the pretensioning force of the traction means to influence
Eine weitestgehend konstante Vorspannung des Zugmittels ist gemäß der Erfindung erzielbar, indem ein Haltestrom oder ein Ruckstellmoment des zur Ak- tivierung des Stellgliedes eingesetzten Elektromotors kontinuierlich erfasst wird und von diesen Betriebsparametern abhangig, die Wirklange des elektronisch geregelten Stellgliedes verändert wirdA largely constant pretension of the traction means can be achieved according to the invention in that a holding current or a restoring torque of the electric motor used for activating the actuator is continuously recorded and, depending on these operating parameters, the effective range of the electronically controlled actuator is changed
Das elektronisch geregelte bzw elektronisch ansteuerbare Stellglied ermog- licht unabhängig von einer beispielsweise durch Verschleiß bedingten Langung des Zugmittels, eine stets konstante Vorspannung des Zugmittels Mit dem erfindungsgemaßen Stellglied kann ein Optimum zwischen geringstem Verschleiß und hoher Kraftübertragung zwischen dem Zugmittel und den anzutreibenden Aggregaten erzielt werdenThe electronically controlled or electronically controllable actuator enables a constant pre-tensioning of the traction means, regardless of whether the traction means is elongated due to wear, for example. With the actuator according to the invention, an optimum between the lowest wear and high power transmission between the traction means and the units to be driven can be achieved
Unter Beachtung bzw Berücksichtigung der Betriebsparameter ist mit dem elektronisch geregelten Stellglied die Zugmittel-Vorspannung stufenlos, beispielsweise zwischen einer Betriebsstellung und einer Neutrallage, einstellbarTaking into account or taking into account the operating parameters, the traction element preload can be set continuously, for example between an operating position and a neutral position, with the electronically controlled actuator
Das bevorzugt mit einer Steuerelektronik der Brennkraftmaschine in Verbindung stehende elektronisch geregelte Stellglied ermöglicht beispielsweise im Startmodus der Brennkraftmaschine ein Verschwenken der Spannvorrichtung, in eine die Vorspannkraft des Zugmittels erhöhende Position Diese Maßnahme ist insbesondere in der Startphase entscheidend, um zwischen den Riemen- Scheiben des Startergenerators und der Kurbelwelle einen Schlupf und damit eine Startverzogerung zu vermeiden Die erfindungsgemaße Spannvorrichtung ist folglich bevorzugt zwischen den Riemenscheiben der Kurbelwelle und des Startergenerators angeordnet Das elektronisch geregelte Stellglied gemäß der Erfindung ermöglicht weiterhin, dass im Stillstand der Brennkraftmaschine der Tragkörper und folglich die damit verbundene Spannrolle selbsttätig in eine der Startposition entsprechen- de Stellung verschwenkt.The electronically controlled actuator, which is preferably connected to control electronics of the internal combustion engine, enables the tensioning device to be pivoted, for example, in the starting mode of the internal combustion engine, into a position that increases the pretensioning force of the traction means to avoid slippage of the crankshaft and thus start deceleration. The tensioning device according to the invention is therefore preferably arranged between the pulleys of the crankshaft and the starter generator The electronically controlled actuator according to the invention further enables the support body and consequently the tensioning pulley connected to it to pivot automatically into a position corresponding to the starting position when the internal combustion engine is at a standstill.
Alternativ kann erfindungsgemäß die Steuerelektronik so ausgelegt werden, dass in der Startphase, synchron zum Startvorgang der Brennkraftmaschine, das elektronisch geregelte Stellglied den Tragkörper und die damit in Verbin- düng stehende Spannrolle in die entsprechende Startposition verschwenkt.Alternatively, according to the invention, the control electronics can be designed such that, in the starting phase, synchronously with the starting process of the internal combustion engine, the electronically controlled actuator pivots the supporting body and the tensioning roller connected therewith into the corresponding starting position.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Nachfolgend wird die Erfindung anhand von zwei Ausführungsbeispielen näher erläutert. Es zeigen:The invention is explained in more detail below on the basis of two exemplary embodiments. Show it:
Figur 1 den schematischen Aufbau eines Zugmitteltriebs, versehen mit einer erfindungsgemäßen Spannvorrichtung;Figure 1 shows the schematic structure of a traction drive, provided with a tensioning device according to the invention;
Figur 2 in einer vergrößerten Darstellung die erfindungsgemäßeFigure 2 shows an enlarged view of the invention
Spannvorrichtung.Tensioner.
Detaillierte Beschreibung der ZeichnungenDetailed description of the drawings
Die Figur 1 zeigt einen Zugmitteltrieb 1 , der als sogenannter Aggregatetrieb ausgebildet, zum Antrieb verschiedener Aggregate einer Brennkraftmaschine vorgesehen ist. Dabei verbindet ein Zugmittel 2, vorzugsweise ein Riemen bzw. ein Zahnriemen die Riemenscheiben der einzelnen Aggregate. Der Antrieb des Zugmitteltriebs 1 erfolgt von der Kurbelwelle 3 bzw. dessen Riemenscheibe, wobei das Zugmittel 2 die Riemenscheiben des Klimakompressors 4, der Wasserpumpe 5, der Lenkhilfspumpe 6 und des Startergenerators 7 umschließt. Eine Spannvomchtung 8a ist dem Zugmittel 2 zwischen dem Startergenerator 7 und der Kurbelwelle 3 zugeordnet. Die Spannvorrichtung 8a umfasst einen Tragkorper 9a, auf dem eine Spannrolle 10 drehbar angeordnet ist, die sich unmittelbar an dem Zugmittel 2 abstutzt Der Tragkorper 9a ist um eine Drehachse 1 1 schwenkbar, die vor- zugsweise an einem im Figur 1 nicht abgebildeten Kurbeigehause der Brennkraftmaschine positioniert ist Die Verstellung der Spannvorrichtung 8a erfolgt ausschließlich über ein Stellglied 12a Erfindungsgemaß ist dazu ein elektronisch geregeltes bzw elektronisch ansteuerbares Stellglied 12a, das auch als Aktor zu bezeichnen ist, vorgesehen Die Figur 1 zeigt dazu ein linear wirken- des Stellglied 12a, versehen mit einer Gewindespindel 13, welche über einen Elektromotor 14 angetrieben ist Die linear auf der Gewindespindel 13 verschiebbare Stellmutter 15 ist über ein gelenkiges Zwischenglied 16 mit dem Tragkorper 9a verbunden Als Zwischenglied 16 dient dazu eine Lasche 17, die an den jeweiligen Endseiten an dem Tragkorper 9a und der Stellmutter 15 ge- lenkig befestigt ist Eine Linearbewegung der Stellmutter 15, gekennzeichnet durch den Doppelpfeil, bewirkt eine Schwenkbewegung der Spannvorrichtung 8a um die Drehachse 11 , wodurch die Vorspannkraft des Zugmittels 2 beeinflusst wirdFIG. 1 shows a traction mechanism drive 1, which is designed as a so-called unit drive and is provided for driving various units of an internal combustion engine. A traction means 2, preferably a belt or a toothed belt, connects the pulleys of the individual units. The traction mechanism drive 1 is driven by the crankshaft 3 or its pulley, the traction mechanism 2 enclosing the pulleys of the air conditioning compressor 4, the water pump 5, the power steering pump 6 and the starter generator 7. A clamping device 8a is assigned to the traction means 2 between the starter generator 7 and the crankshaft 3. The tensioning device 8a comprises a support body 9a, on which a tensioning roller 10 is rotatably arranged, which is supported directly on the traction means 2. The support body 9a can be pivoted about an axis of rotation 11, which is preferably on a crankcase of the internal combustion engine (not shown in FIG. 1) The tensioning device 8a is adjusted exclusively via an actuator 12a. According to the invention, an electronically controlled or electronically controllable actuator 12a, which can also be referred to as an actuator, is provided. FIG. 1 shows a linearly acting actuator 12a provided with a Threaded spindle 13, which is driven by an electric motor 14. The adjusting nut 15, which can be displaced linearly on the threaded spindle 13, is connected to the supporting body 9a via an articulated intermediate member 16. A link 17 serves for this purpose, which is on the respective end sides of the supporting body 9a and Lock nut 15 is articulated A linear movement of the adjusting nut 15, indicated by the double arrow, causes the tensioning device 8a to pivot about the axis of rotation 11, as a result of which the pretensioning force of the traction means 2 is influenced
Der Elektromotor 14 ist vorteilhaft mit der Motorsteuerung 18 gekoppelt, so dass beispielsweise in Abhängigkeit vom Betriebsmodus, d h zwischen der Startphase und der laufenden Brennkraftmaschine die Vorspannkraft des Zugmittels beeinflussbar ist Alternativ oder zusätzlich kann die Verstellung des Stellgliedes 12a ebenfalls in Abhängigkeit von zumindest einem Parameter des Zugmitteltriebs 1 beeinflusst werden Dazu ist ein elektronisches System 19 vorgesehen, welches beispielsweise mit einem im Startergenerator 7 integrierten, oder dem Startergenerator 7 zugeordneten Sensor 20 zusammenwirkt Beispielsweise kann damit die Generatorleistung des Startergenerators 7 kontinuierlich erfasst und dem elektronischen System 19 übertragen werden, um beispielsweise in Abhängigkeit von vorgegebenen Grenzwerten die Vorspannung des Zugmittels 2 zu beeinflussen Das elektronische System 19 kann weiterhin mit zusatzlichen Sensoren ergänzt werden, mit denen die Zugmittel- kraft oder die Drehzahl einer Riemenscheibe überwacht werden kann, um stets eine optimale Vorspannung des Zugmittels 2 zu gewährleisten.The electric motor 14 is advantageously coupled to the motor controller 18, so that, for example, depending on the operating mode, ie between the starting phase and the running internal combustion engine, the pretensioning force of the traction means can be influenced. Alternatively or additionally, the adjustment of the actuator 12a can also be dependent on at least one parameter of the Traction drive 1 are influenced for this purpose, an electronic system 19 is provided, which interacts, for example, with a sensor 20 integrated in the starter generator 7 or assigned to the starter generator 7 Influencing the pre-tension of the traction device 2 as a function of predetermined limit values. The electronic system 19 can also be supplemented with additional sensors with which the traction device Force or the speed of a pulley can be monitored to always ensure an optimal preload of the traction device 2.
Abhängig vom Betriebsmodus der Brennkraftmaschine wird ein Drehmoment von der Kurbelwelle 3 oder dem Startergenerator 7 über die zugehörigen Riemenscheiben in das Zugmittel 2 eingeleitet. Damit verbunden ist ein Wechsel des Leertrums und des Zugtrums bzw. der Drehmomentrichtung in dem Zugmitteltrum zwischen dem Startergenerator 7 und der Kurbelwelle 3. Zur Erzielung einer ausreichenden Vorspannkraft im Startmodus, bei dem der im Uhr- zeigersinn umlaufende Startergenerator 7 die Brennkraftmaschine 3 antreibt ist eine erhöhte Vorspannkraft in dem Zugmittel 2 notwendig. Dazu wird die Spannvorrichtung 8a über das Stellglied 12a in eine, die Vorspannkraft des Zugmittels 2 erhöhende Position verlagert, um einen verzögerungsfreien Start der Brennkraftmaschine zu erzielen, d. h. einen Schlupf des Zugmittels 2 an den Riemenscheiben der Kurbelwelle 3 und des Startergenerators 7 zu verhindern. Die Startposition verdeutlicht die gepunktet dargestellte Lage der Spannrolle 10. Unmittelbar nach dem Start der Brennkraftmaschine wird das Stellglied 12a so angesteuert, dass dieses die Spannvorrichtung 8a in eine die Vorspannkraft des Zugmittels 2 reduzierende Position verlagert.Depending on the operating mode of the internal combustion engine, a torque from the crankshaft 3 or the starter generator 7 is introduced into the traction means 2 via the associated pulleys. This is associated with a change in the empty run and the pull run or the torque direction in the traction means run between the starter generator 7 and the crankshaft 3. To achieve a sufficient pretensioning force in the start mode, in which the starter generator 7 rotating clockwise drives the internal combustion engine 3 increased biasing force in the traction means 2 necessary. For this purpose, the tensioning device 8a is shifted via the actuator 12a into a position which increases the pretensioning force of the traction means 2 in order to achieve a delay-free start of the internal combustion engine, i. H. to prevent the traction mechanism 2 from slipping on the pulleys of the crankshaft 3 and the starter generator 7. The starting position illustrates the position of the tensioning roller 10 shown in dotted lines. Immediately after the internal combustion engine starts, the actuator 12a is actuated in such a way that it displaces the tensioning device 8a into a position reducing the pretensioning force of the traction means 2.
Die Figur 2 zeigt Details des Zugmitteltriebs 1 in einem vergrößerten Maßstab. Abweichend zu Figur 1 zeigt die Spannvorrichtung 8b einen Tragkörper 9b, dessen Drehachse 11 in einem größeren Abstand zum Anlenkpunkt des Stellgliedes 12b angeordnet ist, im Vergleich zu der Spannvorrichtung 8a gemäß Figur 1. Damit verbunden ist ein vergrößerter Stellweg des Stellgliedes 12b notwendig, um die Vorspannkraft des Zugmittels zu verändern. Das Stellglied 12b ist bauraumoptimiert zwischen der Riemenscheibe der Kurbelwelle 3 und dem Startergenerator 7 angeordnet. Die Stellmutter 15 des Stellgliedes 12b bildet weiterhin unmittelbar mit dem Tragkörper 9b ein Gelenk 21. Die Ausbil- düng und Anordndung des Stellgliedes 12b eignet sich insbesondere für klein- volumige Brennkraftmaschinen, bei denen der vorhandene Bauraum begrenzt ist. BezugszahlenFIG. 2 shows details of the traction mechanism drive 1 on an enlarged scale. In contrast to FIG. 1, the tensioning device 8b shows a support body 9b, the axis of rotation 11 of which is arranged at a greater distance from the articulation point of the actuator 12b, in comparison to the tensioning device 8a according to FIG To change the pre-tensioning force of the traction device. The actuator 12b is arranged between the pulley of the crankshaft 3 and the starter generator 7 in an optimized space. The adjusting nut 15 of the actuator 12b also forms a joint 21 directly with the support body 9b. The formation and arrangement of the actuator 12b is particularly suitable for small-volume internal combustion engines in which the available space is limited. reference numerals
Zugmitteltriebtraction drive
Zugmitteltraction means
Kurbelwellecrankshaft
Klimakompressorair compressor
Wasserpumpewater pump
LenkhilfspumpePower steering pump
Startergenerator a Spannvorrichtung b Spaπnvorrichtung a Tragkörper b Tragkörper 0 Spannrolle 1 Drehachse 2a Stellglied 2b Stellglied 3 Gewindespindel 4 Elektromotor 5 Stellmutter 6 Zwischenglied 7 Lasche 8 Motorsteuerung 9 elektronisches System 0 Sensor 1 Gelenk Starter generator a tensioning device b tensioning device a supporting body b supporting body 0 tensioning roller 1 axis of rotation 2a actuator 2b actuator 3 threaded spindle 4 electric motor 5 adjusting nut 6 intermediate link 7 bracket 8 motor control 9 electronic system 0 sensor 1 joint

Claims

Patentansprüche claims
1. Spannvorrichtung für einen Zugmitteltrieb (1 ), der den Antrieb eines zugmittelgetriebenen Startergenerators (7) einer Brennkraftmaschine einschließt, wobei die Spannvorrichtung (8a, 8b) einen um eine Drehachse (11 ) schwenkbaren Tragkörper (9a, 9b) umfasst, an dem eine drehbare, einem Zugmittel (2), vorzugsweise einem Riemen, zugeordnete Spannrolle (11 ) lagepositioniert ist, dadurch gekennzeichnet, dass eine Vorspannkraft des Zugmittels (2) ausschließlich mittels einer Verstellung des Tragkörpers (9a, 9b) beeinflussbar ist und dazu ein elektronisch geregeltes, ansteuerbares Stellglied (12a, 12b) beabstan- det zu der Drehachse (11 ) mittelbar oder unmittelbar mit dem Tragkörper1. Tensioning device for a traction mechanism drive (1), which includes the drive of a traction mechanism-driven starter generator (7) of an internal combustion engine, the tensioning device (8a, 8b) comprising a support body (9a, 9b) which can be pivoted about an axis of rotation (11) and on which Rotatable tensioning roller (11) associated with a traction means (2), preferably a belt, is characterized in that a pretensioning force of the traction means (2) can only be influenced by means of an adjustment of the support body (9a, 9b) and an electronically controlled, controllable actuator (12a, 12b) at a distance to the axis of rotation (11) indirectly or directly with the supporting body
(9a, 9b) verbunden ist.(9a, 9b) is connected.
2. Spannvorrichtung nach Anspruch 1 , wobei ein linear wirkendes Stellglied (12a, 12b) die Verstellung des Tragkörpers (9a, 9b) auslöst.2. Clamping device according to claim 1, wherein a linearly acting actuator (12a, 12b) triggers the adjustment of the support body (9a, 9b).
3. Spannvorrichtung nach Anspruch 2, die ein elektrisch betätigbares Stellglied (12a, 12b) aufweist, das eine mit dem Tragkörper (9a, 9b) zusammenwirkende Gewindespindel (13) sowie eine Stellmutter (15) einschließt.3. Clamping device according to claim 2, which has an electrically actuated actuator (12a, 12b), which includes a threaded spindle (13) interacting with the supporting body (9a, 9b) and an adjusting nut (15).
4. Spannvorrichtung nach Anspruch 2, wobei ein hydraulisch wirkendes Stellglied den Tragkörper (9a, 9b) verschwenkt.4. Clamping device according to claim 2, wherein a hydraulically acting actuator pivots the support body (9a, 9b).
5. Spannvomchtung nach Anspruch 2, die ein pneumatisch wirkendes Stellglied zur Verstellung des Tragkörpers (9a, 9b) einschließt. 5. Spannvomchtung according to claim 2, which includes a pneumatically acting actuator for adjusting the support body (9a, 9b).
6. Spannvorrichtung nach Anspruch 2, die ein elektromagnetisches oder ein elektrisch-hydraulisch wirkendes Stellglied (12a, 12b) umfasst, das an dem Tragkörper (9a, 9b) angelenkt ist.6. Clamping device according to claim 2, which comprises an electromagnetic or an electro-hydraulic actuator (12a, 12b) which is articulated on the support body (9a, 9b).
7. Spannvorrichtung nach Anspruch 1 , wobei zwischen dem Stellglied (12a, 12b) und dem Tragkörper (9a, 9b) ein Zwischenglied (16) und/oder ein Gelenk (21 ) vorgesehen ist.7. Clamping device according to claim 1, wherein an intermediate member (16) and / or a joint (21) is provided between the actuator (12a, 12b) and the support body (9a, 9b).
8. Spannvorrichtung nach Anspruch 7, wobei das Stellglied (12a, 12b) mittelbar über ein Zwischenglied (16) oder einen Kniehebel den Tragkörper (9a, 9b) verstellt.8. Clamping device according to claim 7, wherein the actuator (12a, 12b) indirectly adjusts the support body (9a, 9b) via an intermediate member (16) or a toggle lever.
9. Spannvorrichtung nach Anspruch 1 , wobei die Ansteuerung bzw. Aktivierung des Stellgliedes (12a, 12b) in Abhängigkeit von zumindest einem Betriebsparameter des Zugmitteltriebs (1 ) erfolgt wie:9. Clamping device according to claim 1, wherein the actuation or activation of the actuator (12a, 12b) takes place as a function of at least one operating parameter of the traction mechanism drive (1), such as:
Generatorleistung; Zugmittelkraft;Generator power; Zugmittelkraft;
Wirkrichtung des Drehmomentes im Zugmittel; - Drehzahl einer Riemenscheibe.Direction of action of the torque in the traction device; - speed of a pulley.
10. Spannvorrichtung nach Anspruch 1 , wobei zur Erzielung einer konstanten Vorspannung des Zugmittels (2), ein Haltestrom oder ein Rückstellmoment des zur Aktivierung des Stellgliedes (12a, 12b) eingesetzten Elektromotors (14) kontinuierlich erfasst wird.10. Clamping device according to claim 1, wherein to achieve a constant bias of the traction means (2), a holding current or a restoring moment of the electric motor (14) used to activate the actuator (12a, 12b) is continuously detected.
11. Spannvorrichtung nach Anspruch 1 , wobei die Aktivierung des Stellgliedes (12a, 12b) in Verbindung mit einer Motorsteuerung (18) und/oder eines elektronischen Systems (19) erfolgt, zumindest ein Sensor (20) zugeordnet ist.11. Clamping device according to claim 1, wherein the activation of the actuator (12a, 12b) takes place in connection with a motor control (18) and / or an electronic system (19), at least one sensor (20) is assigned.
12. Spannvorrichtung nach Anspruch 1 , wobei in einem Startmodus der Brennkraftmaschine die Spannvorrichtung (8a, 8b) über das Stellglied (12a, 12b) in eine die Vorspannkraft des Zugmittels (2) erhöhende Position verschwenkt wird.12. Clamping device according to claim 1, wherein in a start mode of the internal combustion engine, the clamping device (8a, 8b) via the actuator (12a, 12b) is pivoted into a position which increases the pretensioning force of the traction means (2).
13. Spannvorrichtung nach Anspruch 1 , die zwischen den Riemenscheiben der Kurbelwelle (3) und des Startergenerators (7) dem Zugmitteltrieb (1 ) zugeordnet ist.13. Clamping device according to claim 1, which is assigned to the traction mechanism drive (1) between the pulleys of the crankshaft (3) and the starter generator (7).
14. Spannvorrichtung nach Anspruch 1 , bei dem das elektronisch geregelte Stellglied (12a, 12b) im Stillstand der Brennkraftmaschine den Tragkör- per (9a, 9b) und damit die Spannvorrichtung (8a, 8b) selbsttätig in eine der Startposition entsprechende Stellung verschwenkt.14. Clamping device according to claim 1, wherein the electronically controlled actuator (12a, 12b) automatically pivots the support body (9a, 9b) and thus the clamping device (8a, 8b) into a position corresponding to the starting position when the internal combustion engine is at a standstill.
15. Spannvorrichtung nach Anspruch 1 , wobei synchron zum Startvorgang der Brennkraftmaschine das elektronisch geregelte Stellglied (12a, 12b) die Spannvorrichtung (8a, 8b) in eine der Startposition entsprechende15. Clamping device according to claim 1, wherein synchronously with the starting process of the internal combustion engine, the electronically controlled actuator (12a, 12b) the clamping device (8a, 8b) in a position corresponding to the starting position
Position verlagert.Position shifted.
16. Spannvorrichtung nach Anspruch 1 , wobei die Ansteuerung des Stellgliedes (12a, 12b) so erfolgt, dass im Betriebszustand der Brennkraft- maschine stets eine konstante Vorspannung des Zugmittels (2) sichergestellt ist.16. Clamping device according to claim 1, wherein the control of the actuator (12a, 12b) takes place in such a way that a constant pretensioning of the traction means (2) is always ensured in the operating state of the internal combustion engine.
17. Verfahren zur Beeinflussung einer Vorspannkraft eines Zugmittels (2) eines Zugmitteltriebs (1 ) mittels einer verstellbaren Spannrolle (11 ), da- durch gekennzeichnet, dass ein Tragkörper (9a, 9b), an dem die17. Method for influencing a pretensioning force of a traction device (2) of a traction device drive (1) by means of an adjustable tensioning roller (11), characterized in that a support body (9a, 9b) on which the
Spannrolle (11 ) befestigt ist, in Abhängigkeit von zumindest einem Betriebsparameter des Zugmitteltriebs (1 ) und/oder einer Brennkraftmaschine verstellt werden kann. Tensioning roller (11) is attached, can be adjusted depending on at least one operating parameter of the traction mechanism drive (1) and / or an internal combustion engine.
EP03735398A 2002-06-07 2003-05-16 Tensing device Withdrawn EP1511925A1 (en)

Applications Claiming Priority (3)

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DE2002125268 DE10225268A1 (en) 2002-06-07 2002-06-07 Tensioning device for a starter generator drive belt for a combustion engine, operates exclusively through an electronically regulated actuator
DE10225268 2002-06-07
PCT/EP2003/005138 WO2003104628A1 (en) 2002-06-07 2003-05-16 Tensing device

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AU2003236661A1 (en) 2003-12-22
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