DE112016003545T5 - Rolling member for a device for damping torsional vibrations - Google Patents

Abstract

Rolling member for a device for damping torsional vibrations. The present invention relates to a rolling element (11) for a device (1) for damping torsional vibrations, which extends along a longitudinal axis (X '), wherein the rolling element (11) comprises a first part (16) of a first material and a second Part (17) of a second material, which differs from the first material, characterized in that the first and the second part are arranged such that there is at least one plane perpendicular to this axis (X ') in which in that: - the first part (16) defines the outer side surface (18) of the rolling element (11) and - the second part (17) lies inside the first part (16).

Description

The present invention relates to a rolling member for a device for damping torsional vibrations, in particular for a motor vehicle transmission system.

In such an application, the torsional vibration damping device may be incorporated in a torsional damping system of a clutch with which the internal combustion engine can be selectively connected to the transmission to filter the vibrations due to engine nonuniformities.

As a variant, in such an application, the device for damping torsional vibrations in a friction disc of the clutch or be integrated in a hydrodynamic torque converter.

In such a device for damping torsional vibrations conventionally a holder and a plurality of movable to this holder pendulum body is used, wherein the displacement of these pendulum body is guided with respect to the holder of rolling members, which cooperate on the one hand with runways, which are fixedly connected to the holder, and on the other hand with runways, which are firmly connected to the pendulum bodies.

Each pendulum body has, for example, two pendulum masses, which are riveted together, and each pendulum body is guided, for example, by two rolling members, each with a roller track, which is firmly connected to the holder, and with a runway, with a lying between the pendulum masses cross member is firmly connected, interact. As a variant, the rolling elements each interact with two runways, which are each firmly connected to a pendulum mass of the pendulum body.

• - den Pendelkörpern, die einer Fliehkraft ausgesetzt sind, und
• - dem Halter, der die Rollorgane daran hindert, sich radial zu entfernen, und dadurch eine Haltekraft ausübt.

When operating the device for damping torsional vibrations, the rolling elements are exposed to strong mechanical loads which are based on:

• - the pendulum bodies, which are exposed to a centrifugal force, and
• - The holder, which prevents the rolling elements from being removed radially, and thereby exerts a holding force.

To respond to these strong mechanical loads, for example, from the application DE 10 2006 028 556 known to provide rolling elements, which are integrally formed. It is also known that these rolling elements are made of steel.

However, in some embodiments of the device, for example when the motor is at a standstill or the rotation speed of the holder is reduced, the rolling elements will fall and cause unwanted noise when they come in contact with the holder.

These rolling elements can also come into axial contact with the pendulum masses, these joints also being a source of unwanted noise.

Thus, there is a need to eliminate these sources of unwanted noise while having resilient rolling elements.

• - der erste Teil die äußere Seitenfläche des Rollorgans definiert und
• - der zweite Teil innerhalb des ersten Teils liegt.

The object of the invention is to respond to this need by achieving, according to one of its aspects, a rolling member for a device for damping torsional vibrations which extends along a longitudinal axis, the rolling element comprising a first part of a first material and a second part of a second material different from the first material, the first and second parts being arranged such that there is at least one plane perpendicular to this axis, in which:

• - The first part defines the outer side surface of the rolling element and
• - the second part lies within the first part.

The two materials can have a different density, the rolling element thus being lighter than a rolling element of the same shape, which is formed integrally and consists solely of that material of the first and the second material having the greater density.

Thus, when it crashes, it takes up little speed, and the shocks that can occur between this rolling element and the elements of the device for damping torsional vibrations form sources of substantially less noise compared to the noise generated by a rolling element with the identical shape, which is formed integrally and consists solely of that material of the first and the second material having the greater density.

The rolling element in particular influenced by its inertia, the filter performance of the device for damping torsional vibrations. Since such a rolling element has a low weight, it responds within a short time to torsional vibrations and allows for effective filtering.

The rolling element can be massive. The rolling element then points in particular to his Longitudinal axis no hollow area, whereby it can have a satisfactory mechanical strength.

• - bedeutet „axial“ „parallel zur Drehachse des Halters“,
• - bedeutet „radial“ „entlang einer Achse, die zu einer Ebene gehört, die orthogonal zur Drehachse des Halters verläuft und diese Drehachse des Halters schneidet“,
• - bedeutet „winkelmäßig“ oder „umfangsmäßig“ „um die Drehachse des Halters herum“,
• - bedeutet „fest verbunden“ „starr gekoppelt“,
• - ist die Ruhestellung des Pendelkörpers diejenige, in der der Pendelkörper einer Fliehkraft aber keinen Ungleichförmigkeiten ausgesetzt ist.

For the purposes of the present application:

• - means "axially""parallel to the axis of rotation of the holder",
• - means "radially""along an axis belonging to a plane orthogonal to the axis of rotation of the holder and intersecting this axis of rotation of the holder",
• - means "angular" or "circumferential""around the axis of rotation of the holder",
• - means "firmly connected""rigidlycoupled",
• - The rest position of the pendulum body is the one in which the pendulum body of a centrifugal force but is not exposed to irregularities.

In other words, the rest position of the device is observed when the holder has no angular acceleration.

The density of the second material may be lower, in particular at least twice less than the density of the first material.

As a result, advantageously the rolling element can be given a satisfactory flexibility.

When the rolling element is subjected to compressive force, it may deform to absorb some of the force and thus maintain the integrity of the rolling element. More specifically, it is the second part that deforms to accommodate the compressive force.

The first material can be a steel.

The second material may be a plastic or an elastomer. It may be advantageous if the plastic of the second material contains polytetrafluoroethylene (abbreviation PTFE) and / or one or more constituents which lead to a reduction of the friction coefficient of the second part. As a variant, the second material may be a plastic containing carbon fibers.

The thickness of the first part to the thickness of the second part can satisfy a ratio of between 0.5 and 0.75 in the plane defined above, which is perpendicular to the longitudinal axis.

In the plane, the first and second parts are concentric. The first part may have an annular cross-section, i. be empty around the longitudinal axis, and the second part may have a circular cross-section.

The first part may be molded onto the second part. As a variant, the first part may be welded or glued to the second part.

According to a first embodiment of the invention, the rolling element can take the form of a straight cylinder. The first part may be cylindrical and completely define the outer side surface of the rolling element, and the second part may be cylindrical and completely define the core of the rolling element.

In other words, in any plane perpendicular to the longitudinal axis passing through the rolling element, the first part may surround the second part.

The rolling element can take the form of a straight cylinder.

Such rolling elements can be obtained by successive punching operations from a profile tube which is formed on a rod in the form of a straight cylinder, wherein the core and the outer surface of the rolling elements are portions of the rod or of the tube. As a result, the production costs can advantageously be reduced and the raw material losses minimized.

Alternatively, the rolling element may take the form of a domed cylinder with a longitudinal axis, i. which is convex in a plane including the longitudinal axis.

In each of the variants, the outer side surface may have two collars protruding in the radial direction.

The outer side surface may extend axially beyond each collar and away from the other collar. As a variant, the collars may form the axial boundaries of the outer side surface so that this surface is not extended beyond these collars.

• - einen zylindrischen Abschnitt, der den Kern des Rollorgans definiert, und
• - zwei Ränder, wobei der zylindrische Abschnitt axial zwischen den Rändern angeordnet ist und jeder Rand einen Teil der äußeren Seitenfläche dieses Rollorgans definiert.

According to a second embodiment, the first part may be cylindrical and partially define the outer side surface of the rolling element, and the second part may comprise:

• a cylindrical section defining the core of the rolling element, and
• - Two edges, wherein the cylindrical portion is arranged axially between the edges and each edge defines a part of the outer side surface of this rolling element.

According to this embodiment, there is a plane perpendicular to the longitudinal axis, in which the rolling element is defined only by its second part. In this plane, the second part may have the shape of a straight cylinder.

According to this embodiment, the first part may be arranged between the two edges of the second part. The first part may consist of one piece instead of separate and spaced parts.

The outer side surface may be defined by different materials, in particular having different densities.

Such first parts can be pipe sections, which are obtained in particular from successive punching operations from a profile pipe.

According to a first variant of this embodiment, each edge may define a cylindrical portion whose radius corresponds to that of the first part.

The radius of a part can define the greatest distance to the longitudinal axis in the radial direction.

According to such a variant, the rolling element thus assumes the shape of a straight cylinder with a longitudinal axis.

According to a second variant of this embodiment, each edge may define a cylindrical surface whose radius is greater than that of the first part.

According to another variant, each edge may define a cylindrical surface whose radius is smaller than that of the first part.

Furthermore, according to the second embodiment, each edge may define an axial surface of the rolling element. In other words, the rolling element does not extend axially beyond the edges of the second part.

As a variant, the rolling element may extend axially beyond each edge and away from the other edge. The rolling element may be extended by its second part away from each edge.

• - einen Halter, der um eine Achse drehbar ist,
• - mindestens einen Pendelkörper, der zum Halter beweglich ist, und
• - mindestens ein wie oben beschriebenes Rollorgan, das die Verlagerung des Pendelkörpers zum Halter führt, indem es vollständig oder teilweise über den ersten Teil mit einer ersten Rollbahn, die mit dem Halter fest verbunden ist, und mit mindestens einer zweiten Rollbahn, die mit dem Pendelkörper fest verbunden ist, zusammenwirkt.

The invention also relates to a device for damping torsional vibrations, which has the following:

• a holder which is rotatable about an axis,
• - At least one pendulum body which is movable to the holder, and
• at least one rolling element as described above, which performs the displacement of the pendulum body to the holder, by completely or partially over the first part with a first runway, which is fixedly connected to the holder, and at least one second runway, with the pendulum body is firmly connected, cooperates.

Due to the density of the first part and / or its material, in particular steel, it is possible to benefit from a desired rolling movement and the integrity of the rolling element and in particular the first part, which is in contact with the holder and / or with the pendulum body, to preserve. A first portion of an elastically deformable material, such as elastomer, may degrade very rapidly upon contact between the holder and the pendulum body under the effect of centrifugal force loads. This deterioration would affect the rolling motion of the rolling element and thus the filter quality.

As explained above, the mass and inertia of the rolling element are sufficiently low to allow efficient filtering from the side of the device.

Due to the low inertia of the rolling element, namely this can advantageously cooperate in a rolling motion with the runways. In some embodiments of the device, a rolling element of the same shape, formed integrally and consisting solely of the material of the first and second material having the greater density, would participate by a sliding movement which is undesirable and a poor one Filtering the torsional vibrations is responsible. Under these same conditions, the rolling element can interact by rolling with the runways, which favors the filtering of the vibrations.

In addition, due to the low inertia of the rolling element, it is advantageously possible that it does not affect the movement of the pendulum when reacting to torsional vibrations. This favors the filter performance of the pendulum body.

The pendulum body may include a first and a second pendulum mass axially spaced from one another and movable toward the holder, the first pendulum mass disposed axially on a first side of the holder and the second pendulum mass disposed axially on a second side of the holder and at least an organ for connecting the first and the second pendulum mass, which arranges the masses in pairs.

When the rolling element is solid, the diametrically opposed ones compensate each other Compression forces each other. Such a rolling element thus has a satisfactory mechanical resistance.

The second runway may be defined by the connecting member. The first and second connection paths may face each other, i. There is a plane perpendicular to the longitudinal axis that intersects each runway.

The connecting member may at least partially extend in a window, in particular of closed circumference, formed in the holder, wherein the first runway may be defined by a part of the circumference of this window.

• - der zylindrische Abschnitt den Kern des Rollorgans definiert und von dem ersten Teil umgeben ist, das die äußere Seitenfläche teilweise definiert, und
• - jeder Rand eine axiale Fläche des Rollorgans definiert.

The second part of the rolling element can then be designed so that:

• - The cylindrical portion defines the core of the rolling element and is surrounded by the first part, which partially defines the outer side surface, and
• - Each edge defines an axial surface of the rolling element.

According to such an embodiment of the device, the first part of the rolling element cooperates with both the first and the second runway.

In operation, the rolling element is exposed to compressive forces, and the core of the rolling element allows its deformation to absorb some of these forces.

The second part may also deform so that the areas in contact with the first and second runways are increased in comparison to a rolling element made only of steel.

The edges of the rolling element can come into contact with the pendulum masses to protect the first part of the rolling element and / or limit its wear, a wear that can occur in the event of shocks between this first part and the pendulum masses. The edges can thus protect the first part by pushing axially between the first part of the rolling element and the pendulum masses. The edges may be made of plastic, the noise generated by these contacts being substantially less than in possible metal-to-metal contacts between the first part of the rolling element and the pendulum masses.

If the edges define a cylindrical portion whose radius is greater than that of the first part, they advantageously allow a limitation of the axial contacts between the pendulum masses and the holder. These edges may also have an axial guidance function which allows the rolling element to be held in contact with the runways.

• - der erste zylindrische Teil die äußere Seitenfläche des Rollorgans vollständig definiert und
• - der zweite zylindrische Teil den Kern des Rollorgans vollständig definiert.

As a variant, according to such an embodiment of the device, the rolling element may have the shape of a straight cylinder in which:

• - The first cylindrical part of the outer side surface of the rolling element completely defined and
• - The second cylindrical part of the core of the rolling element completely defined.

According to a further embodiment of the device, each pendulum mass may have a cavity in which a part of the circumference defines a second runway.

In this further embodiment of the device, the first runway may continue to be firmly connected to the holder, so that the first and the second runway are axially offset. The rolling element can thus be subjected to bending instead of pressure.

In this further embodiment, the device may comprise a rolling element, in which the first part can completely define the outer side surface of the rolling element and the second part can be cylindrical and have a longitudinal axis and can completely define the core of the rolling element.

The outer side surface may have two collars projecting in the radial direction so as to fit axially between the holder and the pendulum masses. The first part of the rolling element can thus interact with the first and the second runway.

• - einen zylindrischen Abschnitt, der den Kern des Rollorgans definiert, und
• - zwei Ränder, wobei der zylindrische Abschnitt axial zwischen den Rändern angeordnet ist, wobei jeder Rand einen Teil der äußeren Seitenfläche dieses Rollorgans definiert und sich das Rollorgan axial über jeden Rand hinaus und weg von dem anderen Rand erstrecken kann. Der erste Teil des Rollorgans kann lediglich mit der ersten Rollbahn zusammenwirken, die mit dem Halter fest verbunden ist.

Furthermore, in this embodiment of the device, as a variant, the device may comprise a rolling element, in which the first part may be cylindrical and only partially define the outer side surface of the rolling element, and in which the second part may comprise:

• a cylindrical section defining the core of the rolling element, and
• - Two edges, wherein the cylindrical portion is arranged axially between the edges, wherein each edge defines a part of the outer side surface of this rolling member and the rolling member can extend axially beyond each edge and away from the other edge. The first part of the rolling element can interact only with the first runway, which is firmly connected to the holder.

By combining the foregoing, the device may comprise a plurality of pendulum bodies comprising at least two connecting members and at least two rolling members. The holder may then have at least two windows, wherein each window can receive one of the connecting members and one of the rolling members.

Thus, according to the present invention, the total number of the windows formed in the holder of the torsional vibration damping device for firmly connecting the pendulum masses of the pendulum bodies and guiding the displacement of these pendulum bodies can correspond to the total number of rolling elements of the device.

The device may have between 2 and 9 pendulum bodies, preferably between 3 and 6 pendulum bodies.

Each pendulum body may have between 1 and 4, preferably 2 connecting members, and between 1 and 4, preferably 2 rolling members.

The holder may have for each pendulum body between 1 and 4, preferably 2 windows.

All of these pendulum bodies can be arranged circumferentially in succession. The device may thus have a plurality of planes that are orthogonal to the axis of rotation and in which each pendulum body are arranged.

• - mindestens einen ersten Pendelkörper, der das Filtern eines ersten Ordnungswerts der Torsionsschwingungen ermöglicht, und
• - mindestens einen zweiten Pendelkörper, der das Filtern eines zweiten Ordnungswerts der Torsionsschwingungen, der sich von dem ersten Ordnungswert unterscheidet, ermöglicht.

In all of the foregoing, the device may include:

• at least one first pendulum body permitting the filtering of a first order value of the torsional vibrations, and
• - At least one second pendulum body, which allows filtering a second order value of the torsional vibrations, which differs from the first order value.

In all the foregoing, the shape of the runways may be such that the shuttle members are translationally displaced only with respect to the holder about a fictitious axis that is parallel to the axis of rotation of the holder.

• - translatorisch um eine fiktive Achse, die parallel zur Drehachse des Halters verläuft, als auch
• - drehbar um den Schwerpunkt des Pendelkörpers bewegt werden, wobei eine derartige Bewegung auch als „kombinierte Bewegung“ bezeichnet wird und beispielsweise in der Anmeldung DE 10 2011 086 532 offenbart ist.

Alternatively, the shape of the runways may be such that the pendulum bodies with respect to the holder both:

• - Translational about a fictitious axis that runs parallel to the axis of rotation of the holder, as well
• be rotatably moved about the center of gravity of the pendulum body, wherein such movement is also referred to as "combined movement" and for example in the application DE 10 2011 086 532 is disclosed.

In all the foregoing, the holder may or may not be integral.

• - eine Abdeckung des Bauteils,
• - eine Führungsscheibe des Bauteils,
• - eine Phasenscheibe des Bauteils oder
• - ein von der Abdeckung, der Führungsscheibe und der Phasenscheibe getrennter Halter.

The holder of the device for damping torsional vibrations can then be one of the following elements:

• a cover of the component,
• a guide disk of the component,
• a phase disc of the component or
• - A separate from the cover, the guide disc and the phase disc holder.

Finally, the subject matter of the invention is a component for a motor vehicle transmission system, wherein the component is in particular a double damping flywheel, a hydrodynamic torque converter or a friction disk with a damping device as defined above.

• - 1 schematisch und teilweise eine Vorrichtung zur Torsionsdämpfung gemäß einem Ausführungsbeispiel der Erfindung zeigt,
• - 2 perspektivisch ein erstes Beispiel einer ersten Ausführungsform eines Rollorgans zeigt,
• - 3 eine Schnittansicht eines Beispiels für das Rollorgan gemäß einer zweiten Ausführungsform zeigt,
• - 4 eine Schnittansicht eines Beispiels für das Rollorgan gemäß einer dritten Ausführungsform zeigt,
• - 5 schematisch und teilweise die Vorrichtung zur Torsionsdämpfung gemäß einem weiteren Ausführungsbeispiel der Erfindung zeigt,
• - 6 perspektivisch ein weiteres Beispiel für das Rollorgan gemäß der ersten Ausführungsform zeigt und
• - 7 perspektivisch ein weiteres Beispiel für das Rollorgan gemäß der dritten Ausführungsform zeigt.

The invention will be better understood by reading the following description of non-limiting examples of its practice and consideration of the accompanying drawings, in which:

• - 1 schematically and partially shows a device for torsional damping according to an embodiment of the invention,
• - 2 shows in perspective a first example of a first embodiment of a rolling element,
• - 3 a sectional view of an example of the rolling element according to a second embodiment,
• - 4 3 shows a sectional view of an example of the rolling element according to a third embodiment,
• - 5 schematically and partially shows the device for torsional damping according to another embodiment of the invention,
• - 6 shows in perspective another example of the rolling element according to the first embodiment and
• - 7 shows in perspective another example of the rolling element according to the third embodiment.

In 1 is a device 1 shown for damping torsional vibrations according to an embodiment of the invention. The damping device 1 is of the pendulum oscillator type. The damping device 1 can in particular equip a motor vehicle transmission system and is integrated, for example, in a component, not shown, of such a transmission system, wherein this component is, for example, a double-damping flywheel.

This component may be part of a motor vehicle drive chain, which includes an internal combustion engine, in particular with three or four cylinders.

Such a dual damper flywheel may comprise in a known manner a torsional damper having at least one input member, at least one output member, and circumferential elastic recovery means disposed between the input and output members. For the purposes of the present application, the terms "input" and "output" are defined relative to the direction of transmission of the torque from the internal combustion engine of the vehicle to the wheels thereof.

• - einen Halter 2, der um eine Achse X drehbar ist, und
• - mehrere Pendelkörper 3, die zum Halter 2 beweglich sind.

In the example considered, the device 1 Following:

• - a holder 2 which is rotatable about an axis X, and
• - several pendulum bodies 3 leading to the holder 2 are mobile.

In the example considered, between 3 and 6 pendulum bodies 3 be provided, which are distributed uniformly on the circumference of the axis of rotation.

• - einem Eingangselement des Torsionsdämpfers,
• - einem Ausgangselement oder einem Phasenzwischenelement, das zwischen zwei Federreihen des Dämpfers angeordnet ist, oder
• - einem Element, das drehbar mit einem der vorgenannten Elemente gekoppelt und von diesen verschieden ist, wobei es sich zum Beispiel um einen zur Vorrichtung 1 zugehörigen Halter handelt.

The holder 2 the damping device 1 can consist of:

• an input element of the torsion damper,
• an output element or a phase intermediate element, which is arranged between two spring rows of the damper, or
• - An element which is rotatably coupled to one of the aforementioned elements and different from these, which is for example one to the device 1 associated holder acts.

At the holder 2 in particular, it is a guide disk or a phase disk.

In the example considered, the holder has 2 Overall, the shape of a ring with two opposite sides 4 that are flat surfaces here.

• - eine erste und eine zweite Pendelmasse 5, die axial voneinander beanstandet und zum Halter 2 beweglich sind, wobei die erste Pendelmasse 5 axial auf einer ersten Seite 4 des Halters 2 angeordnet ist und die zweite Pendelmasse, die nicht gezeigt ist, axial auf einer zweiten Seite 4 des Halters 2 angeordnet ist, und
• - zwei nicht gezeigte Verbindungsorgane, die die beiden Pendelmassen 5 paarweise ordnen.

As in particular in 1 can be seen, in the example considered, each pendulum body 3 Following:

• - a first and a second pendulum mass 5 axially spaced from each other and to the holder 2 are movable, with the first pendulum mass 5 axially on a first side 4 of the owner 2 is arranged and the second pendulum mass, which is not shown, axially on a second side 4 of the owner 2 is arranged, and
• - Two connecting members, not shown, the two pendulum masses 5 arrange in pairs.

The connecting members, which are also referred to as "struts" are angularly offset in the example considered. Although not shown, the connecting members may be forcefully pressed into openings in the pendulum masses 5 are designed to connect them firmly together.

Each connecting member extends partially in a window 9 that in the holder 2 is trained. In the example considered, the window defines 9 an empty space inside the holder, this window being of a closed perimeter 10 is limited.

The device 1 furthermore has rolling elements in the considered example 11 on, each along a longitudinal axis X ' parallel to the axis of rotation of the holder 2 runs, extend and the displacement of the pendulum body 3 in terms of the holder 2 to lead. At the rolling organs 11 these are rollers which, as seen below, can have several different consecutive diameters.

In the example described, the movement of each pendulum body 3 in terms of the holder 2 of two rolling organs 11 led out the example 1 each with one of the connecting organs of the pendulum body 3 interact.

The rolling organs 11 will now be described in more detail.

Every rolling organ 11 works in the example 1 on the one hand with a first runway 12 together, with the holder 2 firmly is connected and through part of the scope 10 of the window 9 is defined, and on the other hand, with a second runway, not shown, with the pendulum body 3 is firmly connected and formed by a part of the outer periphery of the connecting member.

Every rolling organ 11 More precisely, it interacts with its displacement in relation to the holder 2 and on the pendulum body 3 at radially inner height with the second runway and at radially outer height with the runway 12 in that it is acted upon by compression only between the first and the second runways. These runways are opposite each other, ie one to the longitudinal axis X ' of the rolling organ 11 vertical plane runs through the taxiways 12 and 13 , In other words, in the example described, the first and the second runway have radially opposite sections.

With reference to the 2 to 4 Now, various embodiments of the rolling element 11 described with which the device 1 out 1 can be equipped.

• - der erste Teil 16 die äußere Seitenfläche 18 des Rollorgans 11 definiert

und

• - der zweite Teil 17 innerhalb des ersten Teils 16 liegt und
• - die Dicke des ersten Teils 16 zur Dicke des zweiten Teils 17 ein konstantes Verhältnis zwischen 0,5 und 0, 75 erfüllt.

Every rolling organ 11 that in the 2 to 4 is shown has a first part 16 from a first material and a second part 17 of a second material different from the first material, and there are several planes perpendicular to the longitudinal axis X ' and where:

• - the first part 16 the outer side surface 18 of the rolling organ 11 Are defined

and

• - the second part 17 within the first part 16 lies and
• - the thickness of the first part 16 to the thickness of the second part 17 a constant ratio between 0.5 and 0.75 is met.

More specifically, in each of the examples, the 2 and 3 the first part 16 the shape of a straight cylinder, each to the longitudinal axis X ' vertical plane, this first part 16 crosses, which corresponds to just defined level. Thus, in each of these levels lies the second part 17 with a circular cross-section within the first part 16 with annular cross-section, and the two parts are concentric with the axis X ' ,

In each of the embodiments of 2 to 4 For example, the density of the second material is at least two times less than the density of the first material, wherein the first material is a steel while the second material is a plastic or an elastomer.

At the in 1 shown embodiment of the device 1 the first part works 16 the shown rolling organs 11 together with both the first 12 and the second runway. The interaction of the rolling element with the runways thus takes place in accordance with a metal-metal contact.

In operation, therefore, every rolling organ 11 Compressive forces suspended, and the second part 17 every rolling organ 11 allows by its deformation the inclusion of a part of these forces and thus the preservation of the integrity of the rolling organs 11 ,

Finally, with everyone in the 2 to 4 The first part shown embodiments 16 to the second part 17 molded.

It will now be in 2 shown example of the embodiment described in more detail.

In the example considered, each rolling element takes 11 the shape of a straight cylinder with an axis X ' on, with the first part 16 the outer side surface 18 completely defined and the second cylindrical part 17 the core 19 every rolling organ 11 completely defined. Such rolling organs 11 can be obtained by successive punching operations from a profile tube which is formed on a rod in the form of a straight cylinder, wherein the core 19 and the outer surface 18 the organs are sections of the rod or tube.

• - einen zylindrischen Abschnitt, der den Kern des Rollorgans 11 definiert,
• - zwei Ränder 21, wobei der zylindrische Abschnitt axial zwischen den Rändern 21 angeordnet ist und jeder Rand 21 einen Teil der äußeren Seitenfläche 18 dieses Rollorgans 11 definiert.

In the example off 3 is the first part 16 still cylindrical, but the second part 17 indicates:

• - A cylindrical section, which is the core of the rolling element 11 Are defined,
• - two edges 21 wherein the cylindrical portion is axially between the edges 21 is arranged and every edge 21 a part of the outer side surface 18 this rolling organ 11 Are defined.

The rolling organs off 3 continue to take the form of a straight cylinder with an axis X ' on, ie every edge 21 defines a cylindrical section whose radius is that of the first part 16 equals that between these two edges 21 is arranged.

In the example considered, each edge defines 21 also an axial surface of the rolling element 11 , which thus does not axially over these edges 21 extends beyond.

In the example considered, there is thus one to the axis X ' vertical plane passing through the second part 17 runs without going through the first part 16 to get lost.

These edges 21 can with the pendulum masses 5 get in touch to the first part 16 of the rolling organ 11 To protect and / or limit its wear, a wear that occurs in the case of bumps between this first part 16 and the pendulum masses 5 can occur. The edges 21 thus push axially between the first part 16 every rolling organ 11 and the pendulum masses 5 ,

The plastic of the second material may include polytetrafluoroethylene and / or one or more components effective to reduce the coefficient of friction of the second part 17 to lead.

This in 4 shown roller organ 11 is different from that 3 in that its edges 21 define a cylindrical surface whose radius is greater than that of its first part 16 , Thus, in the example under consideration, the rolling element does not take the form of a straight cylinder with an axis X ' , but the shape of a drum.

In the example considered, the edges allow 21 , which are the axial surfaces of the rolling element 11 define, advantageously a limitation of the axial contacts between the pendulum masses 5 and the holder 2 , These edges 21 also have a function of axial guidance, with which the rolling element in contact with the runways 12 and 13 can be held.

As a variant to the in 1 shown device 1 is in 5 another example of the device 1 shown where each pendulum mass 5 a cavity 25 in which a part of the circumference of a second runway 13 defines, wherein the device 1 thus, in this example, two second runways 13 having.

In the example considered becomes the first runway 12 continuing through part of the closed perimeter 10 of the window 9 defined so that the first 12 and the second runway 13 axially offset. The rolling organ 11 is thus stressed on bending and not on pressure, as in the case of 1 shown embodiment of the device 1 the case is.

Referring to the 6 and 7 Here are two examples of a rolling element 11 according to embodiments described in the 2 and 4 are shown and with which the device 1 out 5 can be equipped.

In 6 is a curved roller organ 11 with an axis X ' shown, ie it is in one the axis X ' enclosing plane convex, being its first part 16 the outer side surface 18 completely defined and the cylindrical second part 17 with the axis X ' the core 19 of the rolling organ 11 completely defined.

The outer side surface 18 has two collars 27 on which protrude in the radial direction, so that they are axially between the holder 2 and the pendulum masses 5 Insert, with the outer side surface 18 axially over each collar 27 out and away from the other collar 27 extends.

In the example considered, the first part works 16 of the rolling organ 11 both with the first 12 and with the second runway 13 together.

In the example considered, it is with the collar 27 advantageously possible, the axial contacts between the pendulum masses 5 and the holder 2 to limit. These collars 27 also have a function for axial guidance, with the first part 16 of the rolling organ 11 in contact with the runways 12 and 13 can be held.

Finally, in 7 another example of a rolling organ 11 shown with the device 1 out 5 can be equipped.

In the example considered, the second part 17 of the rolling organ 11 then a cylindrical section on the core 19 of the rolling organ 11 partially defined, with the cylindrical section axially between two edges 21 is arranged, between which the first part 16 is arranged axially, with the rolling element 11 axially over each edge 21 out and away from the other edge 21 extends. The second part 17 defines the rolling element 11 over the edges 21 in addition, extending axially between the holder 2 and the pendulum masses 5 insert.

The first part 16 of the rolling organ 11 then acts only with the first runway 12 together while the roller organ 11 in sections that extend axially across the edges 21 extend beyond, with the second runways 13 interact.

These sections are through annular pieces 28 formed at the second part 17 of the rolling organ 11 attached and trained there. These ring-shaped pieces 28 can be made of the same material as the first part 16 consist, in particular of steel, and on the second part 17 be formed.

The invention is not limited to the examples just described.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006028556 [0007]
• DE 102011086532 [0074]

Claims (16)

Rolling member (11) for a device (1) for damping torsional vibrations, which extends along a longitudinal axis (X '), wherein the rolling member (11) comprises a first part (16) of a first material and a second part (17) a second material different from the first material, characterized in that the first and second parts are arranged such that there is at least one plane perpendicular to this axis (X '), in which: - the first part (16) defines the outer side surface (18) of the rolling element (11) and - the second part (17) lies within the first part (16). Rolling element (11) after Claim 1 , characterized in that the density of the second material is lower, in particular at least twice less than the density of the first material. Rolling member (11) according to one of Claims 1 and 2 , characterized in that the first material is a steel and the second material is a plastic or elastomer. Rolling member (11) according to one of Claims 1 to 3 , characterized in that the thickness of the first part (16) to the thickness of the second part (17) in the vertical plane satisfies a ratio between 0.5 and 0.75. Rolling element (11) according to one of the preceding claims, characterized in that the first part (16) is formed on the second part (17). Rolling element (11) according to one of the preceding claims, characterized in that the first part (16) is cylindrical and the outer side surface (18) of the rolling element is completely defined and the second part (17) is cylindrical and the core (19) of the rolling element completely defined. Rolling member (11) according to one of Claims 1 to 5 characterized in that the first part (16) is cylindrical and partially defines the outer side surface (18) of the rolling element and the second part (17) comprises: a cylindrical portion defining the core (19) of the rolling element, and - Two edges (21), wherein the cylindrical portion is arranged axially between the edges (21) and each edge defines a part of the outer side surface (18) of this rolling element. Rolling element (11) after Claim 7 , characterized in that each edge (21) defines a cylindrical portion whose radius corresponds to that of the first part (16). Rolling element (11) after Claim 7 , characterized in that each edge (21) defines a cylindrical portion whose radius is greater than that of the first part (16). Rolling member (11) according to one of Claims 7 to 9 , characterized in that each edge (21) defines an axial surface of the rolling element (11). Rolling member (11) according to one of Claims 7 to 9 characterized in that it extends axially beyond each edge (21) and away from the other edge. Torsional vibration damping device (1) comprising: a holder (2) which is rotatable about an axis (X), - At least one pendulum body (3) which is movable to the holder (2), and - At least one rolling element (11) according to one of the preceding claims, which performs the displacement of the pendulum body (3) to the holder (2) by all or part of the first part (16) with a first runway (12) with the holder (2) is firmly connected, and with at least one second runway (13) which is fixedly connected to the pendulum body (3) cooperates. Device (1) according to Claim 12 characterized in that it comprises a first and a second pendulum mass (5) which are axially spaced and movable towards the holder (2), the first pendulum mass (5) being axially movable on a first side (4) of the holder (2). is arranged and the second pendulum mass (5) axially on a second side (4) of the holder (2) is arranged, and at least one element for connecting the first (5) and the second pendulum mass (5), which arranges the masses in pairs. Device after Claim 13 , characterized in that the second runway is defined by the connecting element and the rolling member (11) according to a rolling member Claim 10 is. Device (1) according to Claim 13 , characterized in that each pendulum mass (5) has a cavity (25), wherein a part of the circumference defines a second runway (13), and the rolling member (11) according to a rolling element Claim 11 is. Component for a transmission system of a motor vehicle, wherein the component is in particular a double-damping flywheel, a hydrodynamic torque converter or a writing disc, characterized in that it comprises a device (1) according to one of Claims 12 to 15 having.

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