WO2011124201A1 - Divided flywheel - Google Patents

Divided flywheel Download PDF

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Publication number
WO2011124201A1
WO2011124201A1 PCT/DE2011/000318 DE2011000318W WO2011124201A1 WO 2011124201 A1 WO2011124201 A1 WO 2011124201A1 DE 2011000318 W DE2011000318 W DE 2011000318W WO 2011124201 A1 WO2011124201 A1 WO 2011124201A1
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WO
WIPO (PCT)
Prior art keywords
flywheel
pendulum
pendulum mass
split
masses
Prior art date
Application number
PCT/DE2011/000318
Other languages
German (de)
French (fr)
Inventor
Wolfgang Reik
Andrey Sergeev
Original Assignee
Schaeffler Technologies Gmbh & Co. 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.)
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Publication date
Application filed by Schaeffler Technologies Gmbh & Co. Kg filed Critical Schaeffler Technologies Gmbh & Co. Kg
Priority to DE112011101229T priority Critical patent/DE112011101229A5/en
Publication of WO2011124201A1 publication Critical patent/WO2011124201A1/en

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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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
    • F16F15/13128—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses the damping action being at least partially controlled by centrifugal masses
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
    • F16F15/1407—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers the rotation being limited with respect to the driving means
    • F16F15/145—Masses mounted with play with respect to driving means thus enabling free movement over a limited range

Definitions

  • the invention relates to a split flywheel with two mutually limited rotatable flywheels, one of the flywheel masses as effectively connected to a crankshaft of an internal combustion engine input part and the other flywheel is formed as connectable to a transmission component output part.
  • split flywheels with a spring device which acts in the circumferential direction and which contains bow springs, for example, are well known from the prior art.
  • the bow springs are used during an occurrence of torsional vibrations as a buffer for the torque peaks by the input side, primary flywheel relative to the output side, secondary flywheel relatively twisted and the bow springs are compressed.
  • the torque peak fades, the energy stored in the bow springs is released again, resulting in a torque curve transmitted via the split flywheel, which is smoothed by the intermediate storage of the torque peaks and their shifting to smaller torque values.
  • the bow springs are accelerated radially outward, so that their turns are supported radially on the outside under friction.
  • the friction moments formed lead to a partial elimination of spring coils with an increase in the overall stiffness of the spring device and load changes beats.
  • the lubrication of the frictional contact between the spring coils of the bow springs and these radially supporting components preferably the primary flywheel results in benefits.
  • the object of the invention is the development of split flywheels, in particular against the background of increased transmittable torques at ever-decreasing speeds.
  • the split flywheel should be able to be designed so that a resonance speed of the split flywheel is achieved in conjunction with a high-torque engine below the idling speed.
  • the object is achieved by a split flywheel with two mutually limited rotatable flywheels, one of the flywheel masses as effectively connected to a crankshaft of an internal combustion engine input part and the other flywheel than connectable with a transmission component output part, two flywheel masses is assigned at least one pendulum mass and both flywheels are rotationally connected by means of a hinge connection with the interposition of at least one pendulum mass.
  • a spring device for storing mechanical energy can be cached by the formation of a coupled pendulum in the centrifugal force energy contents of torque peaks of an internal combustion engine at least partially and effectively in the form of potential energy.
  • the centrifugal force changes depending on the speed and thus the stiffness of the divided changes depending on the speed
  • the mutually rotatable flywheels are connected via the at least one pendulum mass so that at a centrifugal force due to low speeds, for example, when starting the engine and the like is not able, the at least one at a rotation of the flywheels radially inwardly displaced pendulum mass again to accelerate radially outward and thus over the
  • the torque is transmitted via the hinge connection.
  • the at least one pendulum mass is accelerated radially outward, so that an adjusting the angle of rotation between the flywheel balance between the force acting in the circumferential direction between the flywheel force and the centrifugal force is formed.
  • This balance balances torsional vibration variations introduced into the flywheel, such as torque shocks of the engine.
  • the hinge connection can be designed to be rigid in the circumferential direction, so that the two masses are rigidly coupled in the direction of rotation against each other.
  • the articulation in the circumferential direction elastically by means of a spring device, which are provided, for example, from compared to conventional divided flywheels soft bow springs.
  • a spring device which are provided, for example, from compared to conventional divided flywheels soft bow springs.
  • At least one pendulum mass can be assigned to at least one pendulum mass, at least one pendulum mass of one and at least one pendulum mass of the other flywheel being coupled by means of the rigid or elastic joint connection.
  • the pendulum masses oscillate as coupled pendulum each about one or two pendulum axes, which are arranged radially and preferably at the same distance from the axis of rotation of the split flywheel.
  • At least one of the pendulum masses which are coupled to one another by means of the articulated connection and oscillating on one of the two centrifugal masses, can be elastically coupled to the same or the other flywheel by means of a spring device in the circumferential direction.
  • a pendulum movement of the corresponding pendulum mass can be damped against the flywheel and thus perform a damped vibration with respect to this.
  • the spring device may have a linear, progressive or degressive, one or more stages spring behavior.
  • At least one pendulum mass of a flywheel can be arranged by means of an articulated between flywheel and pendulum mass arranged intermediate piece.
  • the other flywheel may be articulated by means of the hinge connection with the intermediate piece to form an effective between two masses coupled pendulum pendulum. It has proved to be advantageous if the articulated joint articulates on a pendulum axis of the at least one pendulum mass provided on the intermediate piece.
  • Figure 1 is a block diagram of a split flywheel with two each one
  • Figure 2 is a schematic diagram of a relation to the divided flywheel of the figure
  • Figure 3 is a schematic diagram of the split flywheels of Figures 1 and
  • FIG. 4 is a schematic diagram of another split flywheel.
  • 1 shows a schematic diagram of the arranged around the rotation axis 2 and driven by an internal combustion engine not shown split flywheel 1 with the two mutually limited by the rotation axis 2 rotatable flywheels 3, 4.
  • the flywheel masses 3, 4 are in the circumferential direction by means of from the pendulum masses 6, 7 and the articulated joint 8 formed coupled pendulum 5 coupled together. It is understood that in a structural design of the split flywheel 1, the arrangement of the flywheel masses 3, 4 and the coupled pendulum 5 to avoid imbalances to the axis of rotation 2 is symmetrical as in relation to the mass distribution point-symmetrical. For this purpose, several, distributed over the circumference coupled pendulum 5 may be provided.
  • the pendulum masses 6, 7 are each radially spaced and preferably at the same distance from the axis of rotation 2 pendulum axes 9, 10 of the flywheel masses 3, 4 pendulum suspended and radially outside by means of the articulated connection 8 hinged together.
  • the articulated connection 8 is rigidly formed in the embodiment shown in the circumferential direction between the two pendulum axles 9, 10 and takes the pendulum pendulum on the pendulum axis 12, the free pendulum 11 with the pendulum mass 13.
  • the split flywheel 1 is rotationally driven by the engine
  • the output member 15 in the form of the flywheel 4 counteracts a corresponding counter-torque.
  • the two flywheel masses 3, 4 are relatively rotated against each other about the rotation axis 2.
  • the pendulum masses 6, 7 coupled by means of the articulated connection 8 are deflected out of the respective centrifugal force axes 16, 17 occupied in the resting state in the absence of rotation and pulled against the centrifugal force to a smaller diameter with respect to the axis of rotation.
  • the centrifugal force acts as a counterforce, so that adjusts a balance of forces in which the centrifugal force is supported by the input part 14 to the output part 15 to be transmitted torque. Torsional vibrations are smoothed by the existing equilibrium of forces.
  • This Schwingungstilgung cached in the rising flanks of rotational shocks in the form of potential energy of the pendulum masses and falling edges are compensated by restoring from the potential energy is supported by the free pendulum 11, which forms a further speed-adaptive vibration absorber according to known centrifugal pendulum in split flywheels.
  • the free pendulum 11 forms a further speed-adaptive vibration absorber according to known centrifugal pendulum in split flywheels.
  • the divided flywheel 1 of Figure 1 has been divided in the
  • Flywheel 1a of Figure 2 waives a free pendulum.
  • the articulated connection 8a between the flywheel masses 3a, 4a is formed elastically in the circumferential direction by providing the spring device 18 between the pivot points 19, 20.
  • the spring device 18 is formed from an arrangement of one or more circumferentially effective springs 21.
  • the elastic coupling of the two pendulum masses 6a, 7a is particularly advantageous at low speeds, because the springs 21 can be made correspondingly soft. At higher speeds, the spring device 18 is stabilized by the building up centrifugal force on the two pendulum masses 6a, 7a.
  • FIG 3 shows in contrast to the divided flywheels 1, 1a of Figure 1 and Figure 2, the split flywheel 1 b, in which the articulation 8b between the pendulum masses 6b, 7b of the flywheel masses 3b, 4b is rigid and without free pendulum.
  • the spring device 23 is arranged with the spring 24 acting in the circumferential direction. In this way, despite rigid articulation 8b between the pendulum masses 6b, 7b, the two flywheel masses 3b, 4b are elastically coupled together in the circumferential direction by the spring means 23 is connected in parallel to the articulated connection 8b.
  • Figure 4 shows the split flywheel 1c as a schematic diagram with the two flywheel masses 3c, 4c, which is associated with a common pendulum mass 6c.
  • the intermediate piece 26 is received on the pendulum axis 25 of the flywheel 4c pendulum.
  • the swing axle 9c is provided at the intermediate piece 26, to which the pendulum mass 6c is suspended pendulum.
  • the hinge connection 8c is provided, which preferably at the same radial distance from the axis of rotation 2 as the pendulum axis 25 by means of the hinge point 27 on the one hand with the flywheel 3c and by means of the preferably coaxial with the pendulum axis 9c arranged pivot point 28 on the other hand with the Intermediate piece 26 is hingedly connected.

Abstract

The invention relates to a divided flywheel (1, 1a, 1b, 1c) comprising two flywheel masses (3, 3a, 3b, 3c, 4, 4a, 4b, 4c) that can be rotated relative to each other to a limited degree. One of the flywheel masses (3, 3a, 3b, 3c) is designed as an input part (14) that is operatively connected to a crankshaft of an internal combustion engine, and the other flywheel mass (4, 4a, 4b, 4c) is designed as an output part (15) that can be connected to a transmission component. The aim of the invention is to reduce the resonance frequency of the divided flywheel (1, 1a, 1b, 1c) and to improve the insulating effect thereof with respect to torsional vibrations. This is achieved in that at least one pendulum mass (6, 6a, 6b, 6c, 7, 7a, 7b, 7c) is associated with both flywheel masses (3, 3a, 3b, 3c, 4, 4a, 4b, 4c), and the two flywheel masses (3, 3a, 3b, 3c, 4, 4a, 4b, 4c) are connected in a rotationally fixed manner by means of a joint connection (8, 8a, 8b, 8c) with the interconnection of at least one pendulum mass (6, 6a, 6b, 6c, 7, 7a, 7b, 7c).

Description

Geteiltes Schwungrad  Split flywheel
Die Erfindung betrifft ein geteiltes Schwungrad mit zwei gegeneinander begrenzt verdrehbaren Schwungmassen, wobei eine der Schwungmassen als mit einer Kurbelwelle einer Brennkraftmaschine wirksam verbundenes Eingangsteil und die andere Schwungmasse als mit einem Getriebebauteil verbindbares Ausgangsteil ausgebildet ist. The invention relates to a split flywheel with two mutually limited rotatable flywheels, one of the flywheel masses as effectively connected to a crankshaft of an internal combustion engine input part and the other flywheel is formed as connectable to a transmission component output part.
Aus dem Stand der Technik sind geteilte Schwungräder mit aus einer in Umfangsrichtung wirksamen Federeinrichtung, die beispielsweise Bogenfedern enthält, hinreichend bekannt. Hierbei dienen die Bogenfedern während eines Auftretens von Drehschwingungen als Zwischenspeicher für die Drehmomentspitzen, indem die eingangsseitige, primäre Schwungmasse gegenüber der ausgangsseitigen, sekundären Schwungmasse relativ verdreht und die Bogenfedern komprimiert werden. Bei abklingender Drehmomentspitze wird die in den Bogenfedern gespeicherte Energie wieder abgegeben, wodurch ein über das geteilte Schwungrad übertragener Drehmomentverlauf erzielt wird, der durch die Zwischenspeiche- rung der Drehmomentspitzen und deren Verlagerung zu kleineren Drehmomentwerten geglättet ist. Bei zunehmender Drehzahl werden dabei die Bogenfedern nach radial außen beschleunigt, so dass sich deren Windungen unter Reibung radial außen abstützen. Die gebildeten Reibmomente führen zu einer teilweisen Ausschaltung von Federwindungen mit einer Erhöhung der Gesamtsteifigkeit der Federeinrichtung sowie zu Lastwechselschlägen. Die Befettung des Reibkontakts zwischen den Federwindungen der Bogenfedern und den diesen radial abstützenden Bauteilen vorzugsweise der primären Schwungmasse ergibt dabei Vorteile. Split flywheels with a spring device which acts in the circumferential direction and which contains bow springs, for example, are well known from the prior art. Here, the bow springs are used during an occurrence of torsional vibrations as a buffer for the torque peaks by the input side, primary flywheel relative to the output side, secondary flywheel relatively twisted and the bow springs are compressed. As the torque peak fades, the energy stored in the bow springs is released again, resulting in a torque curve transmitted via the split flywheel, which is smoothed by the intermediate storage of the torque peaks and their shifting to smaller torque values. As the speed increases, the bow springs are accelerated radially outward, so that their turns are supported radially on the outside under friction. The friction moments formed lead to a partial elimination of spring coils with an increase in the overall stiffness of the spring device and load changes beats. The lubrication of the frictional contact between the spring coils of the bow springs and these radially supporting components preferably the primary flywheel results in benefits.
Weiterhin müssen bei modernen Brennkraftmaschinen die in der Regel höheren Drehmomente über die Federeinrichtung von der Primärschwungmasse zu der Sekundärschwungmasse übertragen werden. Starke Bauraumbegrenzungen lassen dabei eine Verlängerung der Federn der Federeinrichtung bei für das Drehmoment ausreichender Federrate nicht zu, so dass die Federrate weiter erhöht werden muss und die Eigenresonanz der geteilten Schwungräder in Drehzahl bereiche verlagert werden, die höher als die Leerlaufdrehzahl der Brennkraftmaschine liegt. Zur weiteren Verbesserung der Isolationswirkung von geteilten Schwungrädern werden diese - wie beispielsweise aus der DE 10 2006 028 556 A1 bekannt - mit Fliehkraftpendeln kombiniert, bei denen freie Pendel an einer der beiden Schwungmassen begrenzt verschwenkbar zur Erzielung einer drehzahladaptiven Schwingungstilgung angeordnet werden. Weiterhin zunehmende Maximalmomente moderner Brennkraftmaschinen bei kleineren Drehzahlen erfordern zur Zwischenspeicherung von Drehmomentspitzen mit hohem Absolutmoment bei kleinen Drehzahlen eine effektive Ausnutzung der zwischen den Schwungmassen wirksamen Energiespeichereinrichtung. Furthermore, in modern internal combustion engines, the generally higher torques must be transmitted via the spring device from the primary flywheel to the secondary flywheel. Strong space limitations allow an extension of the springs of the spring device at sufficient for the torque spring rate, so that the spring rate must be further increased and the natural resonance of the divided flywheels are shifted in speed ranges, which is higher than the idle speed of the engine. To further improve the insulating effect of split flywheels they are - as for example known from DE 10 2006 028 556 A1 - combined with centrifugal force pendulums, in which free pendulum limited pivotally mounted on one of the two masses to achieve a speed-adaptive vibration damping. Still increasing maximum torques of modern internal combustion engines at low speeds require for temporary storage of torque peaks with high absolute torque at low speeds effective utilization of effective between the flywheel energy storage device.
Aufgabe der Erfindung ist die Weiterbildung von geteilten Schwungrädern insbesondere vor dem Hintergrund erhöhter übertragbarer Drehmomente bei immer geringer werdenden Drehzahlen. Insbesondere soll das geteilte Schwungrad so ausgelegt werden können, dass eine Resonanzdrehzahl des geteilten Schwungrads in Verbindung mit einer Brennkraftmaschine mit hohem mittlerem Drehmoment unterhalb der Leerlaufdrehzahl erzielt wird. The object of the invention is the development of split flywheels, in particular against the background of increased transmittable torques at ever-decreasing speeds. In particular, the split flywheel should be able to be designed so that a resonance speed of the split flywheel is achieved in conjunction with a high-torque engine below the idling speed.
Die Aufgabe wird durch ein geteiltes Schwungrad mit zwei gegeneinander begrenzt verdrehbaren Schwungmassen gelöst, wobei eine der Schwungmassen als mit einer Kurbelwelle einer Brennkraftmaschine wirksam verbundenes Eingangsteil und die andere Schwungmasse als mit einem Getriebebauteil verbindbares Ausgangsteil ausgebildet, beiden Schwungmassen zumindest eine Pendelmasse zugeordnet ist und beide Schwungmassen mittels einer Gelenkverbindung unter Zwischenschaltung zumindest einer Pendelmasse drehschlüssig verbunden sind. The object is achieved by a split flywheel with two mutually limited rotatable flywheels, one of the flywheel masses as effectively connected to a crankshaft of an internal combustion engine input part and the other flywheel than connectable with a transmission component output part, two flywheel masses is assigned at least one pendulum mass and both flywheels are rotationally connected by means of a hinge connection with the interposition of at least one pendulum mass.
Gegenüber einer Federeinrichtung zur Speicherung von mechanischer Energie können durch die Ausbildung eines gekoppelten Pendels im Fliehkraftfeld Energieinhalte von Drehmomentspitzen einer Brennkraftmaschine zumindest teilweise und effektiv in Form von potentieller Energie zwischengespeichert werden. Die Fliehkraft ändert sich dabei drehzahlabhängig und dadurch ändert sich auch drehzahlabhängig die Steifigkeit des geteilten Compared to a spring device for storing mechanical energy can be cached by the formation of a coupled pendulum in the centrifugal force energy contents of torque peaks of an internal combustion engine at least partially and effectively in the form of potential energy. The centrifugal force changes depending on the speed and thus the stiffness of the divided changes depending on the speed
Schwungrads. Mit zunehmender Drehzahl steigt daher die Steifigkeit. Das heißt, dass bei höheren Drehzahlen das geteilte Schwungrad bei gleichem Verdrehwinkel der Schwungmassen höhere Drehmomente übertragen und ein Mittelmoment moderner Brennkraftmaschinen ohne Resonanzprobleme der Eigenresonanz des geteilten Schwungrads abdecken kann. Bei kleinen Drehzahlen ist der Fliehkrafteinfluss entsprechend gering, so dass eine Resonanzdrehzahl des geteilten Schwungrads erzielt wird, die vorteilhafterweise unterhalb der Leerlaufdrehzahl der Brennkraftmaschine liegt. Insbesondere während Start- und Stopp- vorgängen und eines Betriebs der Brennkraftmaschine bei Leerlaufdrehzahl wird eine hohe Isolationswirkung gegen Drehschwingungen ohne oder nur mit stark verminderten Resonanzeinflüssen erzielt. Flywheel. As the speed increases, therefore, the rigidity increases. This means that at higher speeds the split flywheel can transmit higher torques with the same angle of rotation of the flywheels and can cover a mean torque of modern internal combustion engines without resonance problems of the self-resonance of the split flywheel. At low speeds of the centrifugal force influence is correspondingly low, so that a resonance speed of the divided flywheel is achieved, which is advantageously below the idling speed of the internal combustion engine. Especially during start and stop Operations and an operation of the internal combustion engine at idle speed, a high isolation effect against torsional vibrations is achieved without or only with greatly reduced resonance influences.
Die gegeneinander verdrehbaren Schwungmassen sind dabei über die zumindest eine Pendelmasse so verbunden, dass bei einer Fliehkraft, die infolge geringer Drehzahlen beispielsweise beim Start der Brennkraftmaschine und dergleichen noch nicht in der Lage ist, die zumindest eine bei einer Verdrehung der Schwungmassen nach radial innen verlagerte Pendelmasse wieder nach radial außen zu beschleunigen und damit das über die The mutually rotatable flywheels are connected via the at least one pendulum mass so that at a centrifugal force due to low speeds, for example, when starting the engine and the like is not able, the at least one at a rotation of the flywheels radially inwardly displaced pendulum mass again to accelerate radially outward and thus over the
Schwungmassen zu übertragende Drehmoment zu übertragen, das Drehmoment über die Gelenkverbindung übertragen wird. Mit zunehmender Drehzahl wird danach die zumindest eine Pendelmasse nach radial außen beschleunigt, so dass sich ein den Verdrehwinkel zwischen den Schwungmassen einstellendes Gleichgewicht zwischen der in Umfangsrichtung zwischen den Schwungmassen wirkenden Kraft und der Fliehkraft ausbildet. Dieses Gleichgewicht balanciert in das Schwungrad eingebrachte Drehschwingungsschwankungen wie beispielsweise Drehmomentstöße der Brennkraftmaschine aus. To transmit flywheel mass to be transmitted torque, the torque is transmitted via the hinge connection. With increasing speed thereafter, the at least one pendulum mass is accelerated radially outward, so that an adjusting the angle of rotation between the flywheel balance between the force acting in the circumferential direction between the flywheel force and the centrifugal force is formed. This balance balances torsional vibration variations introduced into the flywheel, such as torque shocks of the engine.
Die Gelenkverbindung kann dabei in Umfangsrichtung starr ausgebildet sein, so dass die beiden Schwungmassen in Verdrehrichtung gegeneinander starr gekoppelt sind. Alternativ kann die Gelenkverbindung in Umfangsrichtung elastisch mittels einer Federeinrichtung, die beispielsweise aus gegenüber in üblichen geteilten Schwungrädern weich ausgebildeten Bogenfedern vorgesehen werden. Infolge des unter bei kleinen Drehzahlen geringen abzustützenden Drehmoments kann eine derartige Federeinrichtung weich und mit großem Verdrehwinkel vorgesehen werden. Bei zunehmender Drehzahl wird diese Federeinrichtung durch die Wirkung der Fliehkraft auf die zumindest eine Pendelmasse zunehmend entlastet. The hinge connection can be designed to be rigid in the circumferential direction, so that the two masses are rigidly coupled in the direction of rotation against each other. Alternatively, the articulation in the circumferential direction elastically by means of a spring device, which are provided, for example, from compared to conventional divided flywheels soft bow springs. As a result of the small torque to be supported at low speeds, such a spring device can be provided soft and with a large angle of rotation. With increasing speed, this spring device is increasingly relieved by the effect of centrifugal force on the at least one pendulum mass.
Gemäß einem vorteilhaften Ausführungsbeispiel eines geteilten Schwungrads kann jeweils einer Schwungmasse zumindest eine Pendelmasse zugeordnet sein, wobei zumindest eine Pendelmasse der einen und zumindest eine Pendelmasse der anderen Schwungmasse mittels der starren oder elastischen Gelenkverbindung gekoppelt sind. Die Pendelmassen pendeln dabei als gekoppelte Pendel jeweils um eine oder zwei Pendelachsen, die radial und bevorzugt auf gleichem Abstand zur Drehachse des geteilten Schwungrads angeordnet sind. According to an advantageous exemplary embodiment of a split flywheel, at least one pendulum mass can be assigned to at least one pendulum mass, at least one pendulum mass of one and at least one pendulum mass of the other flywheel being coupled by means of the rigid or elastic joint connection. The pendulum masses oscillate as coupled pendulum each about one or two pendulum axes, which are arranged radially and preferably at the same distance from the axis of rotation of the split flywheel.
Hierbei hat sich als besonders vorteilhaft erwiesen, bevorzugt symmetrisch zur Drehachse des geteilten Schwungrads zumindest einer Pendelmasse des gekoppelten Pendels zumin- dest eine frei pendelnde Pendelmasse zuzuordnen, wie sie beispielsweise auf Fliehkraftpendeln zur Schwingungstilgung bekannt sind. Nach dem erfinderischen Gedanken können eine oder mehrere derartige, frei pendelnde Pendelmassen an der zwei gekoppelte Pendelmassen verbindenden Gelenkverbindung vorgesehen sein. It has proven to be particularly advantageous here, preferably symmetrically to the axis of rotation of the divided flywheel of at least one pendulum mass of the coupled pendulum. least allocate a free pendulum pendulum mass, as they are known, for example on centrifugal pendulums for vibration damping. According to the inventive idea, one or more such freely oscillating pendulum masses can be provided on the two coupled pendulum masses connecting joint connection.
Nach einem weiteren erfinderischen Gedanken kann zumindest eine der mittels der Gelenkverbindung miteinander gekoppelten und an einer der beiden Schwungmassen pendelnd aufgehängten Pendelmassen mit derselben oder der anderen Schwungmasse mittels einer Federeinrichtung in Umfangsrichtung elastisch gekoppelt sein. Hierbei kann beispielsweise eine Pendelbewegung der entsprechenden Pendelmasse gegen die Schwungmasse gedämpft sein und damit eine gedämpfte Schwingung gegenüber dieser ausführen. Die Federeinrichtung kann ein lineares, progressives oder degressives, ein oder mehrstufiges Federverhalten aufweisen. According to a further inventive idea, at least one of the pendulum masses, which are coupled to one another by means of the articulated connection and oscillating on one of the two centrifugal masses, can be elastically coupled to the same or the other flywheel by means of a spring device in the circumferential direction. In this case, for example, a pendulum movement of the corresponding pendulum mass can be damped against the flywheel and thus perform a damped vibration with respect to this. The spring device may have a linear, progressive or degressive, one or more stages spring behavior.
Gemäß einem weiteren vorteilhaften Ausführungsbeispiel kann zumindest eine Pendelmasse einer Schwungmasse mittels eines gelenkig zwischen Schwungmasse und Pendelmasse angeordneten Zwischenstücks angeordnet sein. Hierbei kann zur Ausbildung eines zwischen beiden Schwungmassen wirksamen gekoppelten Pendels die andere Schwungmasse mittels der Gelenkverbindung mit dem Zwischenstück gelenkig verbunden sein. Es hat sich dabei als vorteilhaft erwiesen, wenn die Gelenkverbindung an einer an dem Zwischenstück vorgesehenen Pendelachse der zumindest einen Pendelmasse gelenkig angreift. According to a further advantageous embodiment, at least one pendulum mass of a flywheel can be arranged by means of an articulated between flywheel and pendulum mass arranged intermediate piece. In this case, the other flywheel may be articulated by means of the hinge connection with the intermediate piece to form an effective between two masses coupled pendulum pendulum. It has proved to be advantageous if the articulated joint articulates on a pendulum axis of the at least one pendulum mass provided on the intermediate piece.
Die Erfindung wird anhand der in den Figuren 1 bis 4 dargestellten Ausführungsbeispiele näher erläutert. Dabei zeigen: The invention will be explained in more detail with reference to the embodiments illustrated in Figures 1 to 4. Showing:
Figur 1 ein Prinzipschaltbild eines geteilten Schwungrads mit zwei jeweils einer  Figure 1 is a block diagram of a split flywheel with two each one
Schwungmasse zugeordneten, mittels einer Gelenkverbindung gekoppelten Gelenkverbindung gekoppelten Pendelmassen,  Flywheel associated pendulum masses coupled by means of a hinge connection coupled pendulum mass,
Figur 2 ein Prinzipschaltbild eines gegenüber dem geteilten Schwungrad der Figur  Figure 2 is a schematic diagram of a relation to the divided flywheel of the figure
1 abgewandelten geteilten Schwungrads mit elastischer Gelenkverbindung, Figur 3 ein Prinzipschaltbild eines den geteilten Schwungrädern der Figuren 1 und  1 modified split flywheel with elastic joint connection, Figure 3 is a schematic diagram of the split flywheels of Figures 1 and
2 ähnliches geteiltes Schwungrad mit einer gegenüber einer Schwungmasse mittels einer Federeinrichtung in Umfangsrichtung gedämpften Pendelmasse, 2 similar split flywheel with a relative to a flywheel by means of a spring device circumferentially damped pendulum mass,
Figur 4 ein Prinzipschaltbild eines weiteren geteilten Schwungrads. Die Figur 1 zeigt ein Prinzipschaltbild des um die Drehachse 2 angeordneten und von einer nicht dargestellten Brennkraftmaschine angetriebenen geteilten Schwungrads 1 mit den beiden gegeneinander um die Drehachse 2 begrenzt verdrehbaren Schwungmassen 3, 4. Die Schwungmassen 3, 4 sind in Umfangsrichtung mittels des aus den Pendelmassen 6, 7 und der Gelenkverbindung 8 gebildeten gekoppelten Pendels 5 miteinander gekoppelt. Es versteht sich, dass bei einer konstruktiven Ausgestaltung des geteilten Schwungrads 1 die Anordnung der Schwungmassen 3, 4 und des gekoppelten Pendels 5 zur Vermeidung von Un- wuchten zur Drehachse 2 symmetrisch wie bezogen auf die Masseverteilung punktsymmetrisch erfolgt. Hierzu können mehrere, über den Umfang verteilte gekoppelte Pendel 5 vorgesehen sein. Figure 4 is a schematic diagram of another split flywheel. 1 shows a schematic diagram of the arranged around the rotation axis 2 and driven by an internal combustion engine not shown split flywheel 1 with the two mutually limited by the rotation axis 2 rotatable flywheels 3, 4. The flywheel masses 3, 4 are in the circumferential direction by means of from the pendulum masses 6, 7 and the articulated joint 8 formed coupled pendulum 5 coupled together. It is understood that in a structural design of the split flywheel 1, the arrangement of the flywheel masses 3, 4 and the coupled pendulum 5 to avoid imbalances to the axis of rotation 2 is symmetrical as in relation to the mass distribution point-symmetrical. For this purpose, several, distributed over the circumference coupled pendulum 5 may be provided.
Die Pendelmassen 6, 7 sind jeweils radial beabstandet und bevorzugt in gleichem Abstand zur Drehachse 2 an Pendelachsen 9, 10 der Schwungmassen 3, 4 pendelnd aufgehängt und radial außerhalb mittels der Gelenkverbindung 8 gelenkig miteinander verbunden. Die Gelenkverbindung 8 ist in dem gezeigten Ausführungsbeispiel in Umfangsrichtung zwischen den beiden Pendelachsen 9, 10 starr ausgebildet und nimmt pendelnd an der Pendelachse 12 das freie Pendel 11 mit der Pendelmasse 13 auf. The pendulum masses 6, 7 are each radially spaced and preferably at the same distance from the axis of rotation 2 pendulum axes 9, 10 of the flywheel masses 3, 4 pendulum suspended and radially outside by means of the articulated connection 8 hinged together. The articulated connection 8 is rigidly formed in the embodiment shown in the circumferential direction between the two pendulum axles 9, 10 and takes the pendulum pendulum on the pendulum axis 12, the free pendulum 11 with the pendulum mass 13.
Das geteilte Schwungrad 1 ist bei von der Brennkraftmaschine drehangetriebenem The split flywheel 1 is rotationally driven by the engine
Eingangsteil 14 in Form der Schwungmasse 3 unter Last dargestellt, wobei das Ausgangsteil 15 in Form der Schwungmasse 4 ein entsprechendes Gegenmoment gegenhält. Infolgedessen werden die beiden Schwungmassen 3, 4 gegeneinander um die Drehachse 2 relativ verdreht. Durch die Verdrehung werden die mittels der Gelenkverbindung 8 gekoppelten Pendelmassen 6, 7 aus den jeweiligen im Ruhezustand bei fehlender Verdrehung eingenommenen Fliehkraftachsen 16, 17 ausgelenkt und entgegen der Fliehkraft auf einen kleineren Durchmesser gegenüber der Drehachse gezogen. Die Fliehkraft wirkt dabei als Gegenkraft, so dass sich ein Kräftegleichgewicht einstellt, bei dem die Fliehkraft das vom Eingangsteil 14 zum Ausgangsteil 15 zu übertragende Drehmoment abstützt. Drehschwingungen werden dabei durch das bestehende Kräftegleichgewicht geglättet. Diese Schwingungstilgung, bei dem ansteigende Flanken von Drehstößen in Form von potentieller Energie der Pendelmassen zwischengespeichert und abfallende Flanken durch Rückspeicherung aus der potentiellen Energie ausgeglichen werden, wird durch das freie Pendel 11 unterstützt, das entsprechend bekannter Fliehkraftpendel in geteilten Schwungrädern einen weiteren drehzahladaptiven Schwingungstilger bildet. lm Unterschied zu dem geteilten Schwungrad 1 der Figur 1 wurde in dem geteilten Input part 14 shown in the form of the flywheel 3 under load, the output member 15 in the form of the flywheel 4 counteracts a corresponding counter-torque. As a result, the two flywheel masses 3, 4 are relatively rotated against each other about the rotation axis 2. As a result of the rotation, the pendulum masses 6, 7 coupled by means of the articulated connection 8 are deflected out of the respective centrifugal force axes 16, 17 occupied in the resting state in the absence of rotation and pulled against the centrifugal force to a smaller diameter with respect to the axis of rotation. The centrifugal force acts as a counterforce, so that adjusts a balance of forces in which the centrifugal force is supported by the input part 14 to the output part 15 to be transmitted torque. Torsional vibrations are smoothed by the existing equilibrium of forces. This Schwingungstilgung, cached in the rising flanks of rotational shocks in the form of potential energy of the pendulum masses and falling edges are compensated by restoring from the potential energy is supported by the free pendulum 11, which forms a further speed-adaptive vibration absorber according to known centrifugal pendulum in split flywheels. In contrast to the divided flywheel 1 of Figure 1 has been divided in the
Schwungrad 1a der Figur 2 auf ein freies Pendel verzichtet. Die Gelenkverbindung 8a zwischen den Schwungmassen 3a, 4a wird in Umfangsrichtung elastisch ausgebildet, indem zwischen die Gelenkpunkte 19, 20 die Federeinrichtung 18 vorgesehen wird. Die Federeinrichtung 18 ist aus einer Anordnung einer oder mehrerer in Umfangsrichtung wirksamer Federn 21 gebildet. Die elastische Koppelung der beiden Pendelmassen 6a, 7a ist insbesondere bei kleinen Drehzahlen vorteilhaft, weil die Federn 21 entsprechend weich ausgeführt werden können. Bei höheren Drehzahlen wird die Federeinrichtung 18 durch die sich aufbauende Fliehkraft an den beiden Pendelmassen 6a, 7a stabilisiert. Flywheel 1a of Figure 2 waives a free pendulum. The articulated connection 8a between the flywheel masses 3a, 4a is formed elastically in the circumferential direction by providing the spring device 18 between the pivot points 19, 20. The spring device 18 is formed from an arrangement of one or more circumferentially effective springs 21. The elastic coupling of the two pendulum masses 6a, 7a is particularly advantageous at low speeds, because the springs 21 can be made correspondingly soft. At higher speeds, the spring device 18 is stabilized by the building up centrifugal force on the two pendulum masses 6a, 7a.
Figur 3 zeigt in Abänderung zu den geteilten Schwungrädern 1 , 1a der Figur 1 und Figur 2 das geteilte Schwungrad 1 b, bei dem die Gelenkverbindung 8b zwischen den Pendelmassen 6b, 7b der Schwungmassen 3b, 4b starr und ohne freies Pendel ausgeführt ist. Zwischen der Pendelmasse 6b und dem Ausleger 22 der Schwungmasse 4b ist die Federeinrichtung 23 mit der in Umfangsrichtung wirksamen Feder 24 angeordnet. Hierdurch können trotz starrer Gelenkverbindung 8b zwischen den Pendelmassen 6b, 7b die beiden Schwungmassen 3b, 4b elastisch in Umfangsrichtung miteinander gekoppelt werden, indem die Federeinrichtung 23 parallel zu der Gelenkverbindung 8b geschaltet wird. Figure 3 shows in contrast to the divided flywheels 1, 1a of Figure 1 and Figure 2, the split flywheel 1 b, in which the articulation 8b between the pendulum masses 6b, 7b of the flywheel masses 3b, 4b is rigid and without free pendulum. Between the pendulum mass 6b and the boom 22 of the flywheel 4b, the spring device 23 is arranged with the spring 24 acting in the circumferential direction. In this way, despite rigid articulation 8b between the pendulum masses 6b, 7b, the two flywheel masses 3b, 4b are elastically coupled together in the circumferential direction by the spring means 23 is connected in parallel to the articulated connection 8b.
Figur 4 zeigt das geteilte Schwungrad 1c als Prinzipschaltbild mit den beiden Schwungmassen 3c, 4c, denen eine gemeinsame Pendelmasse 6c zugeordnet ist. Hierzu ist an der Pendelachse 25 der Schwungmasse 4c das Zwischenstück 26 pendelnd aufgenommen. An dem der Pendelachse 25 gegenüberliegenden Ende ist an dem Zwischenstück 26 die Pendelachse 9c vorgesehen, an der die Pendelmasse 6c pendelnd aufgehängt ist. Zwischen dem Zwischenstück 26 und der Schwungmasse 3c ist die Gelenkverbindung 8c vorgesehen, die bevorzugt im gleichen radialen Abstand zur Drehachse 2 wie die Pendelachse 25 mittels des Gelenkpunktes 27 einerseits mit der Schwungmasse 3c und mittels des bevorzugt koaxial zur Pendelachse 9c angeordneten Gelenkpunktes 28 andererseits mit dem Zwischenstück 26 gelenkig verbunden ist. Bezuqszeichenliste geteiltes SchwungradFigure 4 shows the split flywheel 1c as a schematic diagram with the two flywheel masses 3c, 4c, which is associated with a common pendulum mass 6c. For this purpose, the intermediate piece 26 is received on the pendulum axis 25 of the flywheel 4c pendulum. At the opposite end of the swing axle 25, the swing axle 9c is provided at the intermediate piece 26, to which the pendulum mass 6c is suspended pendulum. Between the intermediate piece 26 and the flywheel 3c, the hinge connection 8c is provided, which preferably at the same radial distance from the axis of rotation 2 as the pendulum axis 25 by means of the hinge point 27 on the one hand with the flywheel 3c and by means of the preferably coaxial with the pendulum axis 9c arranged pivot point 28 on the other hand with the Intermediate piece 26 is hingedly connected. Reference list divided flywheel
a geteiltes Schwungrada split flywheel
b geteiltes Schwungrad b split flywheel
c geteiltes Schwungrad c split flywheel
Drehachse  axis of rotation
Schwungmasse Inertia
a Schwungmassea flywheel
b Schwungmasseb flywheel
c Schwungmasse c flywheel mass
Schwungmasse Inertia
a Schwungmassea flywheel
b Schwungmasseb flywheel
c Schwungmasse c flywheel mass
gekoppeltes Pendel  coupled pendulum
Pendelmasse pendulum mass
a Pendelmassea pendulum mass
b Pendelmasseb pendulum mass
c Pendelmasse c pendulum mass
Pendelmasse pendulum mass
a Pendelmassea pendulum mass
b Pendelmasse b pendulum mass
Gelenkverbindung articulation
a Gelenkverbindunga joint
b Gelenkverbindungb joint connection
c Gelenkverbindung c joint connection
Pendelachse swing axle
c Pendelachsec swing axle
0 Pendelachse 0 swing axle
1 freies Pendel1 free pendulum
2 Pendelachse2 swing axle
3 Pendelmasse3 pendulum mass
4 Eingangsteil4 input part
5 Ausgangsteil Fliehkraftachse Fliehkraftachse Federeinrichtung Gelenkpunkt Gelenkpunkt Feder 5 output part Centrifugal force axis Centrifugal axis Spring device Articulation point Articulation point Spring
Ausleger Federeinrichtung Feder Boom spring device spring
Pendelachse Zwischenstück Gelenkpunkt Gelenkpunkt Swing axle Intermediate piece Swivel point Swivel point

Claims

Patentansprüche claims
1. Geteiltes Schwungrad (1 , 1a, 1b, 1c) mit zwei gegeneinander begrenzt verdrehbaren Schwungmassen (3, 3a, 3b, 3c, 4, 4a, 4b, 4c), wobei eine der Schwungmassen (3, 3a, 3b, 3c) als mit einer Kurbelwelle einer Brennkraftmaschine wirksam verbundenes Eingangsteil (14) und die andere Schwungmasse (4, 4a, 4b, 4c) als mit einem Getriebebauteil verbindbares Ausgangsteil (15) ausgebildet ist, dadurch gekennzeichnet, dass beiden Schwungmassen (3, 3a, 3b, 3c, 4, 4a, 4b, 4c) zumindest eine Pendelmasse (6, 6a, 6b, 6c, 7, 7a, 7b) zugeordnet ist und beide Schwungmassen (3, 3a, 3b, 3c, 4, 4a, 4b, 4c) mittels einer Gelenkverbindung (8, 8a, 8b, 8c) unter Zwischenschaltung zumindest einer Pendelmasse (6, 6a, 6b, 6c, 7, 7a, 7b) drehschlüssig verbunden sind. 1. split flywheel (1, 1a, 1b, 1c) with two mutually limited rotatable flywheels (3, 3a, 3b, 3c, 4, 4a, 4b, 4c), wherein one of the flywheel masses (3, 3a, 3b, 3c) in that an input part (14) operatively connected to a crankshaft of an internal combustion engine and the other flywheel (4, 4a, 4b, 4c) are designed as an output part (15) which can be connected to a transmission component, characterized in that both flywheel masses (3, 3a, 3b, 3c, 4, 4a, 4b, 4c) at least one pendulum mass (6, 6a, 6b, 6c, 7, 7a, 7b) is assigned and both flywheel masses (3, 3a, 3b, 3c, 4, 4a, 4b, 4c) by means of a hinge connection (8, 8a, 8b, 8c) with the interposition of at least one pendulum mass (6, 6a, 6b, 6c, 7, 7a, 7b) are rotationally connected.
2. Geteiltes Schwungrad (1 , 1b, 1c) nach Anspruch 1 , dadurch gekennzeichnet, dass die Gelenkverbindung (8, 8b, 8c) in Umfangsrichtung starr ausgebildet ist.  2. Split flywheel (1, 1b, 1c) according to claim 1, characterized in that the articulated connection (8, 8b, 8c) is designed to be rigid in the circumferential direction.
3. Geteiltes Schwungrad (1a) nach Anspruch 1 , dadurch gekennzeichnet, dass die Gelenkverbindung (8a) in Umfangsrichtung elastisch mittels einer Federeinrichtung (18) ausgebildet ist.  3. split flywheel (1 a) according to claim 1, characterized in that the articulated connection (8 a) in the circumferential direction elastically by means of a spring device (18) is formed.
4. Geteiltes Schwungrad (1 , 1 b) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jeweils einer Schwungmasse (3, 3b, 4, 4b) zumindest eine Pendelmasse (6, 6b, 7, 7b) zugeordnet ist und die zumindest eine Pendelmasse (6, 6b) der einen Schwungmasse (4, 4b) und die zumindest eine Pendelmasse (7, 7b) der anderen Schwungmasse (3, 3b) mittels der Gelenkverbindung (8, 8b) gekoppelt sind. 4. split flywheel (1, 1 b) according to one of claims 1 to 3, characterized in that each of a flywheel (3, 3b, 4, 4b) is associated with at least one pendulum mass (6, 6b, 7, 7b) and the at least one pendulum mass (6, 6b) of a flywheel (4, 4b) and the at least one pendulum mass (7, 7b) of the other flywheel (3, 3b) by means of the hinge connection (8, 8b) are coupled.
5. Geteiltes Schwungrad nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass zumindest einer Pendelmasse zumindest eine frei pendelnde Pendelmasse zugeordnet ist. 5. Split flywheel according to one of claims 1 to 4, characterized in that at least one pendulum mass is associated with at least one freely oscillating pendulum mass.
6. Geteiltes Schwungrad (1) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass zumindest der Gelenkverbindung (8) zumindest eine frei pendelnde Pendelmasse (13) zugeordnet ist.  6. Split flywheel (1) according to one of claims 1 to 5, characterized in that at least the articulated connection (8) is associated with at least one freely oscillating pendulum mass (13).
7. Geteiltes Schwungrad (1 b) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zumindest eine an einer Schwungmasse (4b) pendelnd aufgehängte Pendelmasse (6b) mittels der Gelenkverbindung (8b) mit der anderen Schwungmasse (3b) gekoppelt und mit derselben Schwungmasse (4b) mittels einer Federeinrichtung (23) in Pendelrichtung elastisch gekoppelt ist. 7. Split flywheel (1 b) according to any one of claims 1 to 6, characterized in that at least one of a flywheel (4 b) pendulum suspended pendulum mass (6 b) coupled by means of the hinge connection (8 b) with the other flywheel (3 b) and with the same flywheel (4b) is elastically coupled by means of a spring device (23) in the pendulum direction.
8. Geteiltes Schwungrad (1c) nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass zumindest eine Pendelmasse (6c) einer Schwungmasse mittels eines gelenkig zwischen Schwungmasse (4c) und Pendelmasse (6c) angeordneten Zwischenstücks (26) angeordnet ist. 8. Split flywheel (1c) according to one of claims 1 to 7, characterized in that at least one pendulum mass (6c) of a flywheel by means of a pivotally between flywheel (4c) and pendulum mass (6c) arranged intermediate piece (26) is arranged.
9. Geteiltes Schwungrad (1c) nach Anspruch 8, dadurch gekennzeichnet, dass die andere Schwungmasse (3c) mittels der Gelenkverbindung (8c) mit dem Zwischenstück (26) gelenkig verbunden ist.  9. split flywheel (1c) according to claim 8, characterized in that the other flywheel (3c) by means of the hinge connection (8c) with the intermediate piece (26) is hingedly connected.
10. Geteiltes Schwungrad (1c) nach Anspruch 9, dadurch gekennzeichnet, dass die Gelenkverbindung (8c) an einer an dem Zwischenstück (26) vorgesehen Pendelachse (9c) der zumindest einen Pendelmasse (6c) gelenkig angreift.  10. Split flywheel (1c) according to claim 9, characterized in that the articulated connection (8c) articulated on a at the intermediate piece (26) provided pendulum axis (9c) of the at least one pendulum mass (6c) engages.
PCT/DE2011/000318 2010-04-09 2011-03-24 Divided flywheel WO2011124201A1 (en)

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CN108700157A (en) * 2016-03-16 2018-10-23 爱信艾达株式会社 Arrangement for damping oscillations

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DE112015001422A5 (en) 2014-03-24 2016-12-08 Schaeffler Technologies AG & Co. KG Actuator and method for its production
DE102016212975A1 (en) * 2016-07-15 2018-01-18 Schaeffler Technologies AG & Co. KG centrifugal pendulum
DE102018108414A1 (en) * 2018-04-10 2019-10-10 Schaeffler Technologies AG & Co. KG torsional vibration dampers
DE102018108435A1 (en) * 2018-04-10 2019-10-10 Schaeffler Technologies AG & Co. KG torsional vibration dampers

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