Torque transmission device

A torque transmission device for a drive train of a motor vehicle driven by an internal combustion engine. The device includes an input part and an output part having a common axis of rotation around which the input part and the output part are jointly rotatable relative to one another, and a spring damper arrangement that has at least one energy storage device. A friction device is effective between the input part and the output part and is arranged radially outside the at least one energy storage device, in order to provide a torque transmission device having a construction that is optimized with respect to the installation space.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a torque transmission device, in particular for a drive train of a motor vehicle driven by an internal combustion engine. The device includes an input part and an output part having a common axis of rotation, around which the input part and the output part are jointly rotatable and twistable relative to one another to a limited degree, and a spring damper arrangement that has at least one energy store and a friction device and is effective between the input part and the output part.

2. Description of the Related Art

DE 10 2009 035 916 A1 discloses a torsional vibration damper, in particular a dual mass flywheel, including a primary mass and a secondary mass that are coupled to each other with respect to relative rotation between the two by a friction device, which friction device includes a support plate, a support disc, and a diaphragm spring, and wherein multiple tabs are arranged on the inner circumference of the diaphragm spring to improve the centering of the friction device during assembly of the friction device.

In accordance with DE 10 2009 035 916 A1, the dual mass flywheel includes a primary mass and a secondary mass that are rotatable relative to each other against the force of an arc spring assembly. The dual mass flywheel has an axis of rotation. The secondary mass includes arcuate cutouts in which the arc spring assembly is supported. The primary mass has channel-like arcuate expansions in which the arc spring assembly is situated.

In accordance with DE 10 2009 035 916 A1, the friction device damps the relative rotation between the primary mass and the secondary mass by dry friction. The damping device includes a support plate that is firmly connected, for instance riveted, to the primary mass, and a support disc that is fixed with respect to rotation about the axis of rotation relative to the support plate, but is displaceable in the axial direction relative to the support plate. A friction control disc is arranged between the support plate and the support disc. The friction control disc is connected to the secondary mass by teeth so as to be axially displaceable and fixed against relative rotation. The friction control disc is in surface contact with the support plate and with the support disc. Thus rotation of the friction control disc relative to the support plate and relative to the support disc is possible against the dry friction between the contacting surfaces. The support disc is pressed onto the friction control disc and the support plate, respectively, by a diaphragm spring, causing the friction control disc to be clamped between the support plate and the support disc. Fingers of the support disc pass through corresponding openings in the support plate. Likewise, fingers of the diaphragm spring pass through openings of the support plate.

The present invention has as an object providing a torque transmission device of the kind described above having a design that is adapted to/optimized in terms of the installation space.

SUMMARY OF THE INVENTION

In accordance with one aspect of the present invention, the object identified above is attained by a torque transmission device, in particular for a drive train of a motor vehicle driven by an internal combustion engine, including an input part and an output part having a common axis of rotation around which the input part and the output part are each rotatable and are rotatable relative to one another to a limited degree. The device includes a spring damper arrangement that has at least one energy store and a friction device and is effective between the input part and the output part, wherein the friction device is arranged radially outside the at least one energy store.

The terms “input part” and “output part” refer to a torque flow direction starting from a drive device such as an internal combustion engine. “Radial” refers to the axis of rotation. A radial direction is a direction perpendicular to the axis of rotation.

The torque transmission device can be a torsional vibration damper. The torque transmission device can be a dual mass flywheel. The input part of the torque transmission device can be in driving connection with an output part of the internal combustion engine, in particular to a crankshaft. The output part of the torque transmission device can be in driving connection with an input part of a friction clutch, in particular a clutch cover.

The spring damper arrangement can include a spring device. The spring damper arrangement can include a damper device. The spring device and the damper device of the spring damper arrangement can be connected in parallel. The spring device can include at least one energy store. The spring device can include at least one spring. The at least one spring of the spring device can be a coil spring. The at least one spring of the spring device can be a compression spring. The at least one spring of the spring device can be an arc-shaped coil spring. The spring device can include multiple springs, in particular two springs. The springs of the spring device can be arranged around the axis of rotation in an arc-like way. The springs of the spring device can be arranged around the axis of rotation and can be spaced from the axis of rotation by a first radius. The damper device can include the friction device. The friction device can be arranged around the axis of rotation in an annular way. The friction device can be arranged around the axis of rotation and spaced from the axis of rotation by a second radius. The second radius can be greater than the first radius.

The torque transmission device of the invention requires less installation space in the region of the axis of rotation. A reduced normal force or pressing force is required on the friction device. A surface pressure on the friction device is reduced. The friction device is subject to a lower degree of stress.

A pendulum mass carrier part of a centrifugal pendulum device can be connected to the output part to co-rotate with the latter, and the friction device can be effective between the input part and the pendulum mass carrier part. The output part can have a flange part. The output part can include an inertial mass part. The inertial mass part can be firmly connected to the flange part of the output part. The inertial mass part can be riveted to the flange part of the output part. The pendulum mass carrier part can be firmly connected to the inertial mass part. The pendulum mass carrier part can be riveted to the inertial mass part. The pendulum mass carrier part can be rotatable about the axis of rotation together with the output part. The pendulum mass carrier part can have a flange-like shape. The pendulum mass carrier part can have a double-flange shape, including two flange sections that are spaced from each other in the direction of the axis of rotation. At least one pendulum mass that is displaceable relative to the pendulum mass carrier part under the influence of centrifugal forces can be arranged on the pendulum mass carrier part. The at least one pendulum mass can be displaceable along a defined path. The at least one pendulum mass can be displaceable between a first end position and a second end position. The at least one pendulum mass can be arranged on the pendulum mass carrier part to be displaceable with the aid of pendulum rollers. The at least one pendulum mass and/or the pendulum mass carrier part can include pendulum mass roller tracks in which the pendulum masses are arranged. The at least one pendulum mass can be arranged between the two flange sections of the pendulum mass carrier part.

The friction device can include a friction control disc that is in frictional engagement with the input part and connected to the pendulum mass carrier part in a positive-locking way. The friction control disc can include at least one friction surface that frictionally corresponds with the input part. The friction control disc can be of one-piece construction. The friction control disc can be of multipartite construction. Multiple friction control disc parts can be interconnected by a carrier part. The friction control disc or friction control disc parts can include a friction material. The friction material can be a plastic material. The friction material can be flexible, rubber resin bound, elastomeric resin bound, injection-molded, and/or metal-free. The carrier part can be a sheet metal part. The carrier part can have through holes in which the friction control disc parts are received. Thus, the friction control disc can be entrained by the pendulum mass carrier part in a positive locking way, and a frictional relative movement between the friction control disc and the input part is possible. Friction material is saved. The carrier plate facilitates the assembly of the friction elements.

The input part can include a flange part and a cover part, and the friction control disc can be in frictional engagement with the cover part. The flange part can be used as a driving connection between the torque transmission device and the internal combustion engine. The cover part can be firmly connected to the flange part. The cover part can be connected to the flange part in a material-locking way. The cover part and the flange part can be welded to each other. The cover part can be arranged between the flange part and the pendulum mass carrier part, as viewed in the direction of the axis of rotation. The cover part can include a friction surface in frictional contact with the friction control disc. The friction surface of the cover part can face the pendulum mass carrier part. The friction surface of the cover part can face away from the pendulum mass carrier part. A frictional engagement between the friction control disc and the cover part can occur in a plane that is perpendicular to the axis of rotation. The friction control disc can be in frictional engagement with the flange part. A frictional engagement between the friction control disc and the flange part can occur in a plane that is parallel to the axis of rotation.

The friction device can include a friction control disc that is connected to the input part in a positive locking way, and in frictional engagement with the pendulum mass carrier part. The pendulum mass carrier part can be arranged between the input part and the inertial mass part of the output part, as viewed in the direction of the axis of rotation. The pendulum mass carrier part can include a friction surface in frictional correspondence with the friction control disc. The friction surface of the pendulum mass carrier part can face the input part. Thus, the friction control disc can be entrained by the input part in a positive-locking way, and a frictional relative movement between the friction control disc and the pendulum mass carrier part can occur. The input part can include a flange part and a cover part, and the friction control disc can be connected to the cover part in a positive-locking way.

The cover part can have a flange section arranged radially outside the at least one energy store, and the friction device can be arranged on the flange section. The cover part can include a connecting section for connection with the flange part of the input part. The connecting section of the cover part can be arranged radially inside the flange section. The cover part together with the flange part of the input part can delimit a receiving space for the at least one energy store. The receiving space can have a torus-like shape. The receiving space can be arranged radially inside the flange section. The receiving space can be arranged radially inside the connecting section of the cover part. The friction device can frictionally correspond to the flange section.

First stop portions that are effective in a first direction of rotation and second stop portions that are effective in a second direction of rotation can be provided for connecting the friction control disc in a positive-locking way, and the friction control disc can have entrainment sections corresponding to the stop portions. In the first direction of rotation, the entrainment portions can engage with the first stop sections. In the second direction of rotation, the entrainment portions can engage with the second stop portions. The entrainment portions can engage with the stop portions in the circumferential direction of the friction control disc. Thus different stop portions are effective in each direction of rotation. The stop portions can have recesses. The recesses can have marginal-portions. The marginal portions can form the stop portions. The entrainment portions can be provided with extensions. The extensions can be received in the recesses. The extensions can extend into the recesses in the direction of the axis of rotation. The friction control disc can have multiple entrainment portions distributed in the circumferential direction. The friction control disc can include multiple extensions distributed in the circumferential direction. The extensions can be evenly distributed in the circumferential direction.

In accordance with a further embodiment, for the positive connection, the friction control disc can have the stop portions and the pendulum mass carrier part can have the entrainment-portions. The entrainment portions can be riveting heads of a riveting of the pendulum mass carrier part.

The stop portions can be spaced from the entrainment portions in such a way that hysteresis independent of the direction of rotation is created. The stop portions can be spaced from the entrainment portions in the circumferential direction of the friction control disc. The friction control disc can have recesses shaped like elongated holes. The friction control disc can have multiple recesses distributed along the circumferential direction. Each of the recesses can extend in the circumferential direction of the friction control disc. The recesses can have a shape that is curved in correspondence with the circumference of the friction control disc. Each recess can include a first stop portion and a second stop portion. Each recess can include a first end portion and a second end portion. The first end portions of the recesses can form the first stop portions. The second stop portions of the recesses can form the second stop portions. In the entrainment direction the recesses can be larger than the entrainment portions. The entrainment portions can be guided in the recesses. The lengths of the recesses in the entrainment direction can define a predetermined clearance angle. A “clearance angle” is a maximum angular range through which the input part and the output part can be rotated relative to each other upon a change of the direction of rotation, without any entrainment between the stop portions and the entrainment portions, and thus without friction on the friction control disc.

The friction device can include a spring device for loading the friction control disc, and the spring device can be in immediate frictional contact with the friction control disc. The spring device can apply a force or force component in the direction of the axis of rotation. The spring device can apply a normal force to the friction device to generate a frictional force. The spring device can include a diaphragm spring. The spring device can form a support plate. The spring device can have a dual function. A separate support plate can be dispensed with. In this context, a support plate is, in particular, understood to be an element that is displaceable in the direction of the axis of rotation and rotatable relative to the friction control disc, and is used to transmit a pressing force to the friction control disc. The support plate can be connected for co-rotation with the input part, or with the pendulum mass support part.

The friction control disc can cover the pendulum mass carrier part in such a way that the pendulum rollers are fixed. Thus, separate position-securing means for the pendulum rollers can be dispensed with.

In summary, and in other words, among other aspects, the invention relates to a friction device for a dual mass flywheel including a centrifugal pendulum, wherein the friction device is arranged radially above an arc spring channel. The friction device can be mounted between a cover and a primary mass disc. Actuation of the friction device can take place through an elongated hole on a centrifugal pendulum flange. The width of the elongated hole can define a clearance angle of the friction control disc. Due to the radial position (far outward), an axial force of a diaphragm spring, and thus the surface pressure on the friction control disc, can be reduced and a favorable material can be used for the friction control disc.

The friction device can be mounted to the centrifugal pendulum flange. In that case, the friction control disc can be actuated through a recess in the cover. The diaphragm spring for introducing the axial force into the friction control disc can additionally be used as a support plate. To prevent cylinder rollers from falling out of the centrifugal pendulum, the friction control disc can be placed above roller tracks. The friction control disc can be divided into multiple elements to save plastic material. To simplify the positioning of the various individual elements during assembly, they can be assembled in a carrier plate. The friction device can be riveted to the circumference of the cover with multiple lugs. Thus, no additional rivets need to be used during assembly. The friction control disc can be mounted to a cover side. The friction control disc can be divided into multiple individual elements and mounted to a carrier plate. The carrier plate can be used to actuate the friction device through additional ears on the circumference. The diaphragm spring can also act as a cover disc to create a second friction surface. The diaphragm spring can act as a cover disc. The area of contact on the outer diameter of the friction control disc and on the cover can provide an additional friction surface. Thus, even under the influence of centrifugal forces, the friction control disc can be prevented from widening too much. Multiple tabs on the friction control disc can pass through a recess in the cover and into an elongated hole in the centrifugal pendulum flange, and can thus allow the friction device to be actuated. The friction control disc can be actuated through the closing head of a rivet connection centrifugal pendulum/secondary flywheel.

In the following description, exemplary embodiments of the invention will be described in more detail with reference to drawing figures. Further features and advantages will become apparent from the description. Concrete features of these exemplary embodiments may can represent general features of the invention. Features of these exemplary embodiments that are connected to other features may can represent individual features of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIGS. 1A and 1Bshow two cross-sectional views of a dual-mass flywheel100including an input part102, an output part104, a spring damper device with arc-shaped coil springs such as106, a friction device arranged radially outside the arc-shaped springs106. The dual-mass flywheel includes a friction control disc108and a centrifugal pendulum device with a pendulum mass carrier part110, wherein the friction control disc108is in frictional engagement with the input part102and is connected to the pendulum mass carrier part110in a positive-locking way.FIG. 1Ais a cross-sectional view along the axis of rotation112of the dual mass flywheel100.FIG. 1Bis a sectional view along line Z-Z ofFIG. 1A.

The dual mass flywheel100is an example of a torque transmission device and is a torsional vibration damper. The dual mass flywheel100acts to damp torsional vibrations in an otherwise non-illustrated drive train of a motor vehicle that is driven by an internal combustion engine. Such torsional vibrations are in particular caused by periodic combustion processes in the internal combustion engine and the resultant irregular rotational speed of the crankshaft.

The input part102of the dual mass flywheel100can be connected with an output shaft of the combustion engine, in particular with a crankshaft, in a way to transmit torque. The output part104of the dual mass flywheel100can be connected to an input part of a friction clutch in a torque-transmitting way. The input part102and the output part104are jointly rotatable about the common axis of rotation112and are rotatable relative to each other about the axis of rotation112to a limited degree.

The input part102includes a flange part114and a cover part116. The flange part114and the cover part116are firmly connected to each other; in the present example they are welded together. The flange part114and the cover part116axially abut a receiving space118that is of torus-like shape. The output part104includes a flange part120, and an inertial mass part122is firmly connected, for instance riveted, to the flange part120. The inertial mass part122of the output part104is rotatably supported on the flange part114of the input part102. The pendulum mass carrier part110of the centrifugal pendulum device is firmly connected, preferably riveted, to the inertial mass part122. In a double-flange-like way, the pendulum mass carrier part110is formed with two flange sections arranged to be next to each other and spaced apart as viewed in the direction of the axis of rotation112. Pendulum masses such as124are arranged between the flange sections of the pendulum mass carrier part110.

The pendulum masses124are arranged on the pendulum mass carrier part110so as to be displaceable relative to the pendulum mass carrier part110. The pendulum masses124are pivotable. The pendulum masses124are arranged on the pendulum mass carrier part110so as to be spaced apart from the axis of rotation112. The pendulum masses124are displaceable on a defined path and between two end positions. In the present example, the centrifugal pendulum device includes three pendulum masses124. In accordance with another embodiment, the centrifugal pendulum device can include more or fewer pendulum masses, for example two or four pendulum masses. The pendulum mass carrier part110is arranged between the cover part116of the input part102and the inertial mass part122of the output part104as viewed in the direction of the axis of rotation112.

The pendulum mass carrier part110has through holes such as126corresponding to through holes of the pendulum masses124. Pendulum rollers such as128for supporting the pendulum masses124in a way to be displaceable along a defined path between the two end positions of through holes126are arranged in the through holes126of the pendulum mass carrier part110and the through holes of the pendulum masses.

The spring damper device is effective between the input part102and the output part104. The spring damper device includes arc-shaped coil springs106. In the present example, there are two arc-shaped coil springs106, each of which extends along an approximately semicircular circumferential section of receiving space118. On one side, the arc-shaped springs106are supported on the input part102; on the other side, the arc-shaped springs106are supported on the flange part120of the output part104.

Radially inwardly, the flange part114of the input part102has a portion that extends in the direction of the axis of rotation112and underlies a radially inner portion of the centrifugal pendulum device. Radially outwardly, the cover part116of the input part102has a flange portion130. As viewed in the direction of the axis of rotation112, the flange portion130of the cover part116is radially spaced from the flange part114of the input part102, forming a receiving space between flange part114of input part102and flange portion130of cover part116. That receiving space receives the friction device of the spring damper device.

The friction device includes the friction control disc108, a support plate132, and a diaphragm spring134. The support plate132is displaceable in the direction of the axis of rotation112to a limited degree. The friction control disc108is arranged between the flange section130of the cover part116and the support plate132. The diaphragm spring134is arranged between the flange part114and the support plate132. On one side, the diaphragm spring134is supported on the flange part114and on the other side the diaphragm spring134is supported on the support plate132. Thus the support plate132is loaded by the diaphragm spring in the direction of the friction control disc108. The diaphragm spring134generates a pressing force to press the friction control disc108between the flange section130of the cover part116and the support plate132. On the friction control disc108, the pressing force creates a normal force that, taking into account a coefficient of friction, results in a proportional frictional force.

Facing the pendulum mass carrier part110, the friction control disc108includes entrainment portions such as136. In the present example, the friction control disc108includes two diametrically opposed entrainment portions136. In another embodiment, the friction control disc108can have more or fewer entrainment portions. The friction control disc108can include one, three, or four entrainment portions, for instance. In the present example, the entrainment portions136are formed as axial extensions of circular cross section. The flange portion of the pendulum mass carrier part110that is adjacent to the friction control disc108has engagement portions such as138,140. The engagement portions138,140are defined by respective end portions of elongated hole-like recesses such as142in the pendulum mass carrier part110. The recesses142have an arc-like shape corresponding in shape to the circumference of the friction control disc108. In the lengthwise direction, the recesses142extend over an angular range of approximately 30°-45°, in particular of approximately 36°. The width of the recesses142in the radial direction approximately corresponds to the radial height of entrainment portions136. In the present example, the pendulum mass carrier part110includes two diametrically opposed recesses142. In another embodiment, the pendulum mass carrier part110can have more or fewer recesses. For example the pendulum mass carrier part can have one, three, or four recesses.

In the direction of the axis of rotation112the entrainment portions136of the friction control disc108extend into the recesses142of the pendulum mass carrier part110. The entrainment portions136are guided in the recesses142. As a function of the direction of rotation, the entrainment portions136can alternatingly hit the engagement portions138,140. Thus, there is an angle-of-rotation region in which the input part102and the output part104can be rotated relative to each other without carrying along the friction control disc108. That angular range is also referred to as a clearance angle144.

The bearing region between the inertial mass part122of the output part104and the flange part114of the input part102is arranged radially inward, relative to and facing the axis of rotation112. The connection between the flange part120and the inertial mass part122is arranged in the radially outward direction relative to axis of rotation112. Following even further outward in a radial direction are the receiving space118and the arc-shaped springs106. Following even further outward in a radial direction, the flange part114and the cover part116of the input part102are connected to each other. Following even further outward in a radial direction are the friction device and the centrifugal pendulum device.

FIG. 2is a cross-sectional view of a second embodiment of a dual-mass flywheel200including an input part202, an output part204, a spring damper device including arc-shaped coil springs206, and a friction device arranged radially outside the arc-shaped springs206. The friction device includes a friction control disc208and a centrifugal pendulum device with a pendulum mass carrier part210, wherein the friction control disc208is connected to the input part202in a positive-locking way and in frictional engagement with the pendulum mass carrier part210. The cover part212of the input part202includes recesses with stop portions in which the entrainment portions of the friction control disc208engage. The flange section214of the cover part212is bent towards the pendulum mass carrier part210. The recesses with the stop portions are arranged on that border of the cover segment212that is oriented toward the pendulum mass carrier part210. A diaphragm spring216is connected, in the present example riveted, to that flange portion of the pendulum mass carrier part210that faces the input part202. The diaphragm spring216simultaneously functions as a support plate. The friction control disc208covers that flange portion of the pendulum mass carrier part210that faces the input part202in such a way that pendulum rollers of the pendulum mass carrier element are prevented from falling out. The pendulum rollers of the centrifugal pendulum device are fixed with the aid of the friction control disc. For further functional details, refer in particular toFIG. 1and the associated description.

FIG. 3is a cross-sectional view of a third embodiment of a dual mass flywheel300, including an input part302, an output part304, a spring damper device including arc-shaped coil springs306and a friction device arranged radially outside the arc-shaped springs306. The friction device includes a friction control disc308and a centrifugal pendulum device with a pendulum mass carrier part310, wherein the friction control disc308is embodied as a carrier plate312with friction elements314. The carrier plate312is shaped like an annular disc and has recesses such as316. The friction elements314are inserted into the recesses316. The recesses316are shaped like elongated holes. Each friction element314has a friction portion318and an attachment portion320. For further functional details, refer in particular toFIG. 1and the associated description.

FIG. 4is a cross-sectional view of a dual mass flywheel400, including an input part402, an output part404, a spring damper device including arc-shaped coil springs406, and a friction device arranged radially outside the arc-shaped springs406. The friction device includes a friction control disc408and a centrifugal pendulum device with a pendulum mass carrier part410, wherein the friction control disc408is held by a diaphragm spring412riveted to the input part402. The diaphragm spring412simultaneously functions as a support plate414. The diaphragm spring412is connected, in the present example riveted, to a flange portion416of a cover part418of the input part402. The riveting is arranged on the radially outer marginal section of the flange portion416. For riveting purposes, pins420protruding towards the pendulum mass carrier part410are arranged on the marginal section of the flange portion416. The pins420are part of the flange portion416. For assembly purposes, the pins420are placed in through holes of the diaphragm spring412and the free ends of the pins420are deformed to connect the diaphragm spring412with the flange portion416. Thus, no separate rivets are required. Recesses with stop portions are provided on that flange portion of the pendulum mass carrier part410that faces the input part402. For further functional details, refer in particular toFIG. 1and the associated description.

FIG. 5is a cross-sectional view of a dual mass flywheel500, including an input part502, an output part504, a spring damper device including arc-shaped coil springs506and a friction device arranged radially outside the arc-shaped springs506. The friction device includes a friction control disc508and a centrifugal pendulum device with a pendulum mass carrier part510, wherein the friction control disc508is embodied as a carrier plate512with friction elements that are effective on two sides of carrier plate512. The carrier plate512is shaped like an annular disc and has recesses such as514. The friction elements are arranged in the recesses514. The recesses514are shaped like elongated holes. Each friction element includes two friction element parts516,518. Each friction element part516,518has a friction portion520,522and an attachment portion524,526. For assembly purposes, the attachment portions524,526of the friction element parts516,518are joined at the recesses514in such a way that they are held in the recesses514. Thus each friction element part516,518has two respective friction sides520,522. The friction control disc508is suitable for two-sided frictional contact. Recesses with stop portions are arranged on that flange portion of the pendulum mass carrier part510that faces the input part502. The carrier plate512has axial extensions directed toward the flange portion of the pendulum mass carrier part510. Those axial extensions define entrainment portions528. The diaphragm spring530simultaneously acts as a support plate532. For further functional details, refer in particular toFIG. 1and the associated description.

FIG. 6is a cross-sectional view of a dual mass flywheel600, including an input part602, an output part605, a spring damper device including arc-shaped coil springs606, and a friction device arranged radially outside the arc-shaped springs606. The friction device includes a friction control disc608and a centrifugal pendulum device with a pendulum mass carrier part610, wherein a diaphragm spring612is provided as a support plate614. Recesses with stop portions are provided on that flange portion of the pendulum mass carrier part610that faces the input part602. The pendulum mass carrier part610that faces input part602includes axially-directed portions616that protrude in the direction of the input part602in a tab-like manner. These portions616include the recesses with the stop portions. In the radial direction, the friction control disc608is in frictional contact with the flange part618of the input part602. Thus, movement of the friction control disc608under the influence of centrifugal forces can be limited or prevented. For further functional details, refer in particular toFIG. 1and the associated description.

FIG. 7is a cross-sectional view of a dual mass flywheel700, including an input part702, an output part704, a spring damper device including arc-shaped coil springs706and a friction device arranged radially outside the arc-shaped springs706. The friction device includes a friction control disc708and a centrifugal pendulum device with a pendulum mass carrier part710, wherein a positive connection is established between the friction control disc708and the pendulum mass carrier part710with the aid of rivets such as712. The rivets712act to connect the flange portions of the pendulum mass carrier part710, as well as of the pendulum mass carrier part710, with the inertial mass part714of the output part704. Each rivet712has a rivet head716, such as a closing head, directed towards the input part702. The rivet heads716form entrainment portions. The friction control disc708has recesses with stop portions. For further functional details, refer in particular toFIG. 1and the associated description.