DE112020003099T5 - Device for damping torsional vibrations - Google Patents

Abstract

Device (1) for damping torsional vibrations, comprising: - a torsional vibration damper (3) comprising a first input element (31) having a first window (32) and capable of being connected to a drive shaft, a first connecting member connected thereto suitable for rigidly connecting the first input member to the drive shaft through the window, - a torque limiter (4) comprising friction means non-rotatably connected to a second output member (41) having a second window (42), an elastic element (18), two lids (15) and a second connecting member (43) able to fasten the two lids together, the second connecting member (43) being movable between a locked position and an unlocked position in which the friction device is rotatable relative to the covers (15), - a connector (40) suitable for connecting the torsional vibration damper (3) with connected to the torque limiter (4).

Description

The present invention relates to a device for damping torsional vibrations, which can be installed in particular in a drive chain of a motor vehicle.

From the patent application FR 3 039 613 a device for damping torsional vibrations is known, comprising a torsional damping device, a torque limiter located at the input and radially upstream of the torsional damping device, and an anti-sway device located axially adjacent to the torque limiter. With this structure, a satisfactory damping of the torsional vibrations can be obtained by the device, but it has a high inertia downstream of the torque limiter, which leads to high overtorques in the drive chain. In addition, such a structure is difficult to assemble and maintain.

The aim of the invention is to improve this type of device.

• - einen Torsionsschwingungsdämpfer, der ein erstes Eingangselement, das mindestens ein erstes Fenster aufweist und mit einer Antriebswelle verbunden sein kann, mindestens ein erstes Verbindungsorgan, das dazu geeignet ist, das erste Eingangselement durch das mindestens eine erste Fenster um eine Drehachse drehfest mit der Antriebswelle zu verbinden, ein erstes Ausgangselement und mindestens ein zwischen dem ersten Eingangselement und dem ersten Ausgangselement angeordnetes Organ zum Speichern von mechanischer Energie umfasst,
• - einen Drehmomentbegrenzer, der eine Reibeinrichtung, die drehfest mit einem zweiten Ausgangselement verbunden ist, das mindestens ein zweites Fenster aufweist und drehfest mit einer Abtriebswelle verbunden sein kann, ein elastisches Element, zwei Deckel und mindestens ein zweites Verbindungsorgan umfasst, das dazu geeignet ist, die beiden Deckel fest miteinander zu verbinden, wobei das mindestens eine zweite Verbindungsorgan zwischen einer verriegelten Position, in der das elastische Element vorgespannt ist, so dass es einen vorbestimmten axialen Druck auf die Reibeinrichtung ausübt, und einer entriegelten Position beweglich ist, in der sich das elastische Element in der Ruhestellung befindet und die Reibeinrichtung relativ zu den Deckeln drehbar ist,
• - ein Verbindungsstück, das dazu geeignet ist, den Torsionsschwingungsdämpfer mit dem Drehmomentbegrenzer zu verbinden.

The subject matter of the invention is therefore in particular a device for damping torsional vibrations, in particular for a vehicle drive chain, which has the following:

• - a torsional vibration damper comprising a first input element, which has at least one first window and can be connected to a drive shaft, at least one first connecting element suitable for connecting the first input element, through the at least one first window, to the drive shaft in a manner fixed against rotation about an axis of rotation connect, comprises a first output element and at least one element for storing mechanical energy arranged between the first input element and the first output element,
• - a torque limiter comprising a friction device non-rotatably connected to a second output element having at least one second window and which may be non-rotatably connected to an output shaft, an elastic element, two covers and at least one second connecting member suitable for this purpose, to connect the two covers firmly together, the at least one second connecting member being mobile between a locked position, in which the elastic element is prestressed so that it exerts a predetermined axial pressure on the friction means, and an unlocked position, in which the elastic element is in the rest position and the friction device is rotatable relative to the covers,
• - a connector suitable for connecting the torsional vibration damper to the torque limiter.

The torque limiter is thus as close as possible to the gearbox, which makes it possible to limit the inertia in front of the torque limiter and therefore the application of overtorques to the torque limiter.

With this structure, moreover, a particularly satisfactory damping of the torsional vibrations can be obtained by the device.

The invention also enables easy assembly and/or disassembly of the device, e.g. B. in manufacturing, maintenance and / or testing. The at least one second connector is axially movable between the locked position and the unlocked position to allow angular realignment of the at least one first window with the at least one second window. In particular, in the unlocked position, the elastic element is in a rest position, i. H. it does not exert any axial pressure on the friction device. The lids are thus rotatable about the axis of rotation relative to the second output member, and the second output member is thus rotatable relative to the first input member. In this way, the windows of the first input element and of the second output element can be perfectly realigned axially, allowing the at least one first connecting member to be easily passed through the windows in order to rigidly connect the first input element to the drive shaft, which can also be called the crankshaft . With this ease of assembly/disassembly, it is possible to limit the risk of breakage and reduce the time that workers spend on servicing the parts, e.g. B. in a workshop, have to work on them.

In addition, with this structure, a device can be obtained which is compact and particularly suitable for drive chains of hybrid engines.

The connector is different from the second connector. In this way, the structure is optimized and robust.

The second output element is separate from each of the two lids. So the parts can be more standardized and cheaper to manufacture. This directly contributes to creating a more compact structure and to the device being easy to assemble and/or disassemble, e.g. B. at manufacturing, maintenance and/or testing. Angular realignment of the at least one first window to the at least one second window is possible independent of the second output member.

The torsional vibration damper can be any damper.

• - ein primäres Schwungrad, das das erste Eingangselement bildet, das mit einer Kurbelwelle eines Verbrennungsmotors oder eines Hybridmotors des Fahrzeugs verbunden sein kann,
• - ein sekundäres Schwungrad, das direkt oder indirekt mit dem zweiten Eingangselement des Drehmomentbegrenzers verbunden sein kann,
• - mehrere Organe zur elastischen Rückstellung, die parallel zueinander zwischen dem primären und dem sekundären Schwungrad angebracht sind.

The torsional vibration damper can be a dual-mass flywheel. This then shows the following:

• - a primary flywheel constituting the first input element which can be connected to a crankshaft of an internal combustion engine or a hybrid engine of the vehicle,
• - a secondary flywheel, which may be directly or indirectly connected to the second input element of the torque limiter,
• - several elastic return devices placed parallel to each other between the primary and secondary flywheels.

The friction device of the torque limiter comprises a disc fixedly connected to the second output member. The elastic element is suitable for exerting a predetermined axial pressure, so that a component which is fixedly connected to at least one of the covers is pressed against the pane.

As a variant, the friction device of the torque limiter comprises at least one component and one washer integral with the second output element. The elastic element is suitable for exerting a predetermined axial pressure, so that the component is pressed against the disc.

The component of the friction device of the torque limiter is a friction lining attached to the disc.

As a variant, the component of the friction device of the torque limiter is a friction lining fixed to at least one of the covers and to a drive plate of the torque limiter.

The at least one second connecting member is a screw engaging in a thread formed on one of the covers of the torque limiter, the screw having a threaded shank whose thread has an axial pitch greater than an axial crushing pitch of the elastic element.

The elastic element in the rest position has a first maximum axial distance. The preloaded elastic element has a second maximum axial distance. The axial crush distance is the difference between the first maximum axial distance and the second maximum axial distance. The axial length of the screw shank thread is greater than the axial crimping distance. In this way, the at least one second connecting element can be engaged with the thread of the torque limiter cover so that the elastic element is released towards the rest position, while the two torque limiter covers remain non-rotatably connected. It is therefore not necessary to completely unscrew the at least one second connecting element in order to release the load from the elastic element. Thus, the angular realignment between the at least one second window of the second output element and the at least one first window and the at least one first connecting element of the torsional vibration damper can be easily carried out without completely dismantling the torque limiter.

The torque limiter is dry running. The torque limiter is placed outside the space in which the at least one mechanical energy storage device is housed. The arrangement of the torque limiter outside this with lubricant such. B. Grease, allows dry friction with organic linings and an elastic Belleville sealing ring, which allows a perfect functional control of the slipping torque with a minimal axial bulk.

The torsional vibration damper and the torque limiter are axially aligned. That is, the torsional vibration damper and the torque limiter are located axially next to each other. The axial alignment of at least part of the torsional vibration damper with the torque limiter allows the torque limiter to be placed as close as possible to the output, i. H. on the second output member to limit inertia downstream of the torque limiter, significantly limiting overtorque. This orientation also allows the addition of an additional torsional vibration damper, which is at least partially radially aligned with the torsional vibration damper.

The connector forms one of the covers of the torque limiter. The torsional vibration damper is thus directly, ie without an intermediate piece, firmly connected to the torque limiter, resulting in an axially compact device maintenance can be obtained and costs (fewer parts to be manufactured) and assembly time can be saved. The connecting piece can also be involved in the sealing of the torsional vibration damper.

The device also comprises at least one third connection element suitable for directly non-rotatably connecting the first output element of the torsional vibration damper and the connecting piece, the at least one third connection element being a screw. This bolted connection allows for an independent torque limiter sub-assembly, simplifying all assembly operations (slip torque control, running-in, balancing...).

The device does not include a bearing between the first input member of the torsional vibration damper and the second output member of the torque limiter. This lack of a bearing can limit manufacturing costs and reduce the risk of static indeterminacy.

The device also includes an additional torsional vibration damper which is at least partially radially aligned with the at least one mechanical energy storage member of the torsional vibration damper. In this way, torsional vibrations are particularly well damped without increasing the axial and/or radial space requirement of the device.

The additional torsional vibration damper is a pendulum damper with a pendulum support that can rotate about the axis and at least one pendulum mass that can move freely and guided relative to the pendulum support, with the first output element of the torsional vibration damper forming the pendulum support. The axial space requirement is retained. In addition, savings in cost (fewer parts to be manufactured) and assembly time of the device can be achieved by using the first output member as a shuttle beam. In addition, the use of the first output element as a pendulum support allows the use of pendulum masses with a satisfactory thickness. Since the filter performance of the pendulum damper is related in particular to the mass of the pendulum masses, the device thus allows effective filtering of non-uniformities.

The pendulum damper can be arranged between the torsional vibration damper and the limiter and in the direction of torque transmission. This avoids saturation of the pendulum damper since the acyclic torque is dampened by the torsional vibration damper. This therefore enables better operation of the pendulum damper.

The sway damper may be axially offset from the torque limiter.

With overtorque applied to the torque limiter, the pad(s) may slide relative to the covers.

At least a portion of each of the two covers is axially spaced to frame the pad or pads and the torque limiter disc. These two lids can approach each other with increasing distance from the axis of rotation until they touch. At the level of this contact area, the at least one second connecting element can enable the two covers to be firmly connected. These two covers can thus be fastened radially beyond the covering or coverings.

The torque limiter may also include a drive plate rotatable about the axis of rotation and capable of axial movement. The drive plate can be arranged between the two covers. The drive plate can be non-rotatably connected to the two covers.

The pad(s) may be located between the drive plate and one of the covers.

If the torque limiter has pads located on one side and the other side of the disc, each may abut one side of the disc and one side of one of the covers and one side of the drive plate respectively.

In the event of excess torque being exerted on the torque limiter, the pads are arranged so that they can slide, in particular in rotation, with respect to the caps and the drive plate against which they bear.

The elastic member, preferably a Belleville washer, can also be placed between one of the two covers and the drive plate.

The elastic member can bear against a side of the drive plate opposite to the side of this plate on which the lining or linings bear.

The elastic member makes it possible to keep the drive plate in contact with the lining or linings despite the wear of this lining or linings. The bias of elastic member makes it possible to always exert a calibrated compressive force on the drive plate, which allows the pad or pads to be clamped between this drive plate and the cover.

The subject matter of the invention is also a vehicle drive chain with a device as described above.

The drive chain may be part of a vehicle powertrain, which may include a hybrid engine or an electric motor, preferably a hybrid engine.

• - Bewegen des mindestens einen zweiten Verbindungsorgans aus der verriegelten Position in die entriegelte Position,
• - Winkelverschiebung des zweiten Ausgangselements, bis das mindestens eine zweite Fenster auf das mindestens eine erste Fenster des ersten Eingangselements ausgerichtet ist,
• - Bewegen des mindestens einen zweiten Verbindungsorgans aus der entriegelten Position in die verriegelte Position.

The invention also relates to a method for assembling and/or maintaining a device as described above, the method comprising the following steps:

• - moving the at least one second connecting element from the locked position to the unlocked position,
• - angular displacement of the second output element until the at least one second window is aligned with the at least one first window of the first input element,
• - moving the at least one second connecting member from the unlocked position to the locked position.

"Vehicle" means motor vehicles, which include not only passenger vehicles, but also commercial vehicles, which includes in particular trucks, public transport vehicles or agricultural vehicles, but also any transport device that carries a living being and/or an object from a point can be taken to another.

• - 1 eine Schnittansicht eines Beispiels einer erfindungsgemäßen Vorrichtung zur Dämpfung von Torsionsschwingungen, wobei sich das mindestens eine zweite Verbindungsorgan in der verriegelten Position befindet.
• - 2 eine Ansicht in einem zweiten Schnitt der Vorrichtung zur Dämpfung von Torsionsschwingungen aus 1.
• - 3 die Schnittansicht von 1, wobei sich das mindestens eine zweite Verbindungsorgan in der entriegelten Position befindet.
• - 4 eine perspektivische Schnittansicht der Vorrichtung zur Dämpfung von Torsionsschwingungen aus 1.

The invention will be better understood and other details, characteristics and advantages of the invention will become clearer on reading the following description given by way of non-limiting example with reference to the accompanying drawings. In the drawings show:

• - 1 a sectional view of an example of a device according to the invention for damping torsional vibrations, wherein the at least one second connecting member is in the locked position.
• - 2 12 is a view in second section of the torsional vibration damping device 1 .
• - 3 the sectional view of 1 , wherein the at least one second connecting member is in the unlocked position.
• - 4 a perspective sectional view of the device for damping torsional vibrations 1 .

In the 1 until 3 1 shows a device 1 for damping torsional vibrations for a vehicle drive chain, which includes a torsional vibration damper 3 and a torque limiter 4 .

The torsional vibration damper 3 may comprise a first input element, a first output element, at least one first connection member (not shown) and at least one mechanical energy storage member. Both the first input element and the first output element are rotatable about an axis of rotation X. The first input element may be a primary flywheel 31 . The first input element can be connected to a drive shaft, also called a crankshaft. The first input element has at least one first window 32, preferably a plurality of first windows 32. The at least one first connecting element is suitable for connecting the primary flywheel 31 to the drive shaft in a rotationally fixed manner. The torsional vibration damper 3 preferably has a plurality of first connecting members. The torsional vibration damper 3 can have as many first connecting members as there are first windows 32 . The torsional vibration damper 3 preferably comprises several mechanical energy storage devices placed between the input and output elements. In the present example, the mechanical energy storage means are curved springs 9 which oppose the pivoting of the first input element relative to the first output element.

In the example considered, the torsional vibration damper 3 has an annular cover 10 which forms the first output element of the torsional vibration damper 3 . The cover 10 may have at least two arms that extend radially from the main annular body of the cover 10 . The springs 9 can be accommodated between two arms of the cover 10. The springs 9 can be held axially by the primary flywheel 31 and a connector 40 and radially by the primary flywheel 31 and the cover 10 so that they cannot come loose.

Alternatively, the torsional vibration damper 3 has an annular cover 10, which forms the first output element of the torsional vibration damper 3, and two guide washers. These two guide washers can be mounted on one side and on the other of the cover 10, and in the cover 10 and in the Guide discs are windows for receiving the springs 9 are formed. In addition, the guide washers hold these springs 9 in place axially so that they cannot come loose.

The springs 9 can be housed in a space defined between the first input member and the torque limiter 4 . This space can be filled with grease to facilitate operation and prolong the life of the springs 9. This space can be tight. The torsional vibration damper 3 can also have a sealing disk 11 . The sealing washer 11 can be suitable for making the space containing the springs 9 sealed. The sealing disk 11 can be in contact with the torsional vibration damper 3 and the torque limiter 4 . The sealing washer 11 can allow axial centering between the torsional vibration damper 3 and the torque limiter 4 by creating a support between the torsional vibration damper 3 and the torque limiter 4 . A thrust bearing may be formed between the cover 10 and a friction washer provided on the primary flywheel 31 .

The torque limiter 4 has a friction device. The friction device of the torque limiter 4 can comprise at least one component and a disk 6 which is connected in a torque-proof manner to the second output element of the torque limiter 4 . The component of the friction device of the torque limiter 4 may be a friction lining 5 fixed to the disc. Alternatively, the component of the friction device of the torque limiter 4 can be a friction lining 5 which is attached to at least one of the covers 15 and to a drive plate 16 of the torque limiter 4 .

The second output element can be a hub 41 . The hub 41 can be connected to an output shaft (not shown here), which can connect the device 1 to a gearbox. This hub 41, which is rotatable about the X-axis, can transmit torque to an output shaft. The hub 41 may have at least one second window 42, preferably as many second windows 42 as the primary flywheel 31 has first windows 32. Each second window 42 is axially aligned with a first window 32 . Each second window 42 is suitable for allowing one of the first connecting members to pass through, in order to simplify the assembly of the device on the transmission chain.

In the example considered, the torque limiter 4 is located axially beyond the torsional vibration damper 3 and the flat disc 6 of the torque limiter 4 is fixed to the hub 41 by several rivets.

The location of the torque limiter 4 outside the space that contains grease and houses the springs 9 allows a dry torque limiter 4. The dry torque limiter 4 allows dry friction with organic friction linings 5, which allow perfect functional control of the slipping torque with a minimal axial footprint of the torque limiter 4 .

Two pads 5 in the form of an annular disc with the axis of rotation X are placed on one side and on the other side of the governor's disc 6 (one pad on each side - the pads 5 and the disc 6 being plane opposite and perpendicular to the X axis have surfaces). The coverings 5 can be attached to this disk 6, e.g. B. by several rivets. Alternatively, the pads 5 may be attached to at least one of the covers 15 and to the drive plate 16, preferably to one of the covers 15 at a time, e.g., by a plurality of rivets.

It should be pointed out that in the example considered, instead of the annular disk-shaped coverings, disk-section-shaped coverings 5 can be arranged on one side and on the other side of the disk 6 .

The torque limiter 4 also has two concentric drive caps 15 with the axis X, which are fixed to each other, and the drive plate 16, which can rotate about the axis X and can be moved axially, which is arranged between the two drive caps 15 and is non-rotatably connected to these two caps 15 ,.

The linings 5 are arranged between the drive plate 16 and one of the drive covers 15 so that they always rest on one side of one of the drive covers 15 and on one side of the drive plate 16 .

In the event of excess torque being applied to the torque limiter 4, the pads 5 are arranged to slide in rotation with respect to the drive cover 15 and the drive plate 16 against which they bear. Alternatively, if the pads 5 are non-rotatably connected to the caps 15 and the drive plate 16, they are arranged so that they can slide in rotation in the event of an overtorque exerted on the torque limiter 4 with respect to the disc 6 against which they bear .

In the example considered, an elastic member, here a Belleville sealing ring 18, arranged axially between the other of the two covers 15 and the drive plate 16 . The Belleville washer 18 may abut the side of the drive plate 16 opposite the side of the drive plate 16 against which the pad 5 abuts. This Belleville washer 18 makes it possible to keep the drive plate 16 in contact with the pads 15 despite the wear of these pads 5. The Belleville sealing ring 18 is preloaded in such a way that it always exerts a predetermined axial pressure on the drive plate 16 which enables the pads 5 to be clamped between this drive plate 16 and the cover 15 . When the Belleville washer 18 is in the rest position, it exerts insufficient axial pressure on the drive plate 16 to prevent the pads 5 from being pinched between this drive plate 16 and the cover 15. The pads 5 can then slide freely in rotation with respect to the cover 15 even without overtorque.

In the example under consideration, the assembly formed by the pads 5 and the washer 6 to which they are riveted is arranged so that, when there is an overtorque exerted on the torque limiter 4, it will move relative to the covers 15 and the drive plate 16 in Rotation can slide.

The two covers 15 thus frame the pads 5 and the disc 6 and, as the distance from the X axis increases, these two covers 15 approach each other until they touch. At the level of this contact area, a number of second connecting members enable the two covers 15 to be fixed to one another. Each of the plurality of second connecting members may be a screw 43 . Each screw 43 may include a shank and a head. Each screw 43 can be axially moveable between a locked position and an unlocked position. In the locked position, each screw 43 is adapted to preload the Belleville washer ring 18 so that the predetermined axial pressure is applied to the friction means and in particular to the at least one lining and disc. In the unlocked position, each screw 43 is adapted to allow the Belleville washer 18 to rest, so that the disc 6 and pads can rotate relative to the covers 15 and relative to the disc 6, respectively, without overtorque being transmitted. This lack of loading allows for angular realignment of the first plurality of windows 32 with the second plurality of windows 42.

The two covers 15 have at least one thread 45 . Both covers preferably have a plurality of threads 45 and in particular one thread 45 per screw 43 . Each screw 43 is suitable for engaging in a thread 45, so that the two covers are connected to one another in a rotationally fixed manner. One of the two covers 15 has a thread 45 which can have an axial distance D45.

When the Belleville washer 18 is in the rest position, it may have a first maximum axial distance D18. The preloaded Belleville washer 18 may have a second maximum axial distance D19. The Belleville washer 18 may have an axial crimp clearance. The axial crush distance is the difference between the first maximum axial distance D18 and the second maximum axial distance D19. The shank of screw 43 may have an axial thread length D43 which is greater than the axial crimp distance of Belleville washer 18.

Thus, each screw 43 can be in engagement with the thread 45, so that the displacement of the Belleville sealing ring 18 in the direction of the rest position is possible, while the two covers 15 of the torque limiter 4 remain non-rotatably connected. Thus, it is not necessary to fully loosen the screws 43 to remove the load from the Belleville washer 18. Thus, the angular realignment between each second window 42 of the hub 41 and each first window 32 and first connecting members of the torsional vibration damper 3 can be easily carried out without the torque limiter 4 being completely dismantled.

The axial distance D45 of the thread 45 can be greater than the axial length D43 of the thread of the shank of the screw 43. Alternatively, the axial distance D45 of the thread 45 can correspond to the axial length D43 of the thread of the shank of the screw 43.

The two covers 15 are thus firmly connected radially above the pads 5 and axially at the same height. The connecting piece 40 can in particular connect the torque limiter 4 to the torsional vibration damper 3 in a rotationally fixed manner. The connector 40 can form one of the covers 15 of the torque limiter 4 . Thus, one of the covers 15, ie the connecting piece 40, is connected directly, ie without an intermediate piece, in a rotationally fixed manner to the cover 10 of the torsional vibration damper 3. With the connector 40 it is thus possible to obtain an axially compact device 1 and to obtain savings in costs (fewer parts to be manufactured) and in assembly time. This fixed connection can be realized by at least one third connecting element 44 and preferably by several third connecting elements 44 will. Each third connecting element 44 can be a screw. This screw connection allows an independent torque limiter subassembly 4, which facilitates assembly operations (slip torque control, running-in, balancing...). This screw connection also enables the torque limiter subassembly 4 to be radially centered with respect to the rest of the device 1.

Thus, in the example considered, the torque is transmitted from the engine flywheel 21 to the torsional vibration damper 3 and then to the torque limiter 4, which in turn is integral with the output hub 41, via the cover 10 forming the first output element.

In the example considered, the torque limiter 4 is centered on the hub 41 via the disc 6 .

The device 1 can also have an additional torsional vibration damper.

The additional torsional vibration damper can be one or more springs connected in series.

Alternatively, the additional torsional vibration damper can be a pendulum damper 2 . The pendulum damper 2 is suitable for damping torsional vibrations. The pendulum damper 2 can comprise a pendulum support 25 which can be rotated about the X-axis and a plurality of pendulum masses 26 . This pendulum damper 2 can be firmly connected to the torsional vibration damper 3 via the pendulum support 25 . In particular, the cover 10 of the torsional vibration damper 3 can form the pendulum support 25 . This pendulum damper 2 can be aligned at least partially radially with the torsional vibration damper 3 .

In the example considered, the pendulum damper 2 is on the path taken by the torque.

In the example considered, the pendulum damper 2 is arranged between the torsional vibration damper 3 and the torque limiter 4 and in the direction of torque transmission.

In the example considered, the pendulum damper 2 is arranged radially below the springs 9 .

In the example shown, the pendulum damper 2 is housed in the space containing the springs 9 . Thus, the grease contained in the space can also lubricate the pendulum damper 2.

The pendulum masses 26, which are attached to the periphery of the pendulum support 25, are free to move with respect to this support while being guided by it.

The pendulum masses 26 are each put into a pendulum movement during operation and comprise two parts 27 which are attached axially on one side and on the other side of the pendulum support 25 and are connected to one another by two struts 28 which each penetrate an opening in the pendulum support 25. A roller 29 cooperates with two raceways, each formed in an opening of a part 27 of the pendulum mass 26, and with a third raceway formed by the edge of an opening of the pendulum beam 25, which differs from the openings of the pendulum beam, the intended for the struts differs.

Alternatively, the roller 29 cooperates with a race formed on the strut 28 and with a second race formed by the edge of the opening of the shuttle 25 intended for the strut.

In each of these cases, a plurality of rollers 29 can be provided for each pendulum mass 26.

The pendulum mass 26 and the linings 5 of the torque limiter 4 are preferably offset axially.

In response to the torsional vibrations or rotational irregularities, each pendulum mass 26 moves in such a way that its center of gravity oscillates like a pendulum.

In the example considered, the pendulum masses 26 and the pads 5 are axially offset and may partially overlap when viewing the device 1 along the X axis.

The ranges of movement of the pendulum masses 26 or the pads 5 are all of the positions occupied by these pendulum masses and pads.

The pendulum masses 26 all describe the same range of motion, this range of motion overlapping axially and partially with the range of motion described by the coverings 5 . In certain configurations of the device 1 there is at least one axis parallel to the X-axis which runs through both a covering 5 and a pendulum mass 26 .

The device 1 does not contain a bearing between the primary flywheel 31 of the torsional vibration damper 3 and the hub 41 of the torque limiter 4. This lack of bearings, it is possible to limit manufacturing costs and the risk of static indeterminacy. The bearings are not required for the device 1 since it already has centering means. The torque limiter 4 is centered by the hub 41 . In addition, the connector 40 may have a shoulder 40a designed to have a small amount of clearance inside the hub 41 so that the connector 40 is radially centered with respect to the hub 41 and therefore with respect to the torque limiter 4 will. In addition, a washer ensures the radial centering between the primary part of the torsional vibration damper 3 and the connecting piece 40.

When an operator wants to assemble the device 1, he takes the torsional vibration damper 3 and the torque limiter. Then she assembles the torsional vibration damper 3 and the torque limiter 4. To do this, she screws the torque limiter 4 to the torsional vibration damper 3 via the third connecting members 44. She then moves the screws 43 from the locked to the unlocked position in order to axially align the first and second windows 32, 42, as in particular in FIG 4 you can see. Then it moves the screws 43 from the unlocked position to the locked position, bringing the torque limiter into the optimum operating position. Thereafter, the operator can weld the cover of the torsional vibration damper 3 to the primary flywheel 31. At this time, the torsional vibration damper 3 and the torque limiter 4 form a single subassembly. Finally, on an assembly line, a new operator can attach the device 1 to the drive shaft by means of the first connecting members passing through the first and second windows.

The steps are the same except for the first step when it comes to performing a maintenance operation on the device 1.

The invention is not limited to the examples just described.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• FR 3039613 [0002]

Claims (10)

Device (1) for damping torsional vibrations, comprising: - a torsional vibration damper (3) comprising a first input element (31) having at least one first window (32) and capable of being connected to a drive shaft, at least one first connection member capable of connecting the first input element through the at least one first to connect the window to the drive shaft in a rotationally fixed manner about an axis of rotation (X), comprising a first output element (10) and at least one element (9) arranged between the first input element and the first output element for storing mechanical energy, - a torque limiter (4) comprising a friction device non-rotatably connected to a second output element (41) having at least one second window (42) and which may be non-rotatably connected to an output shaft, an elastic element (18), two covers (15) and at least one second connecting member (43) able to fasten together the two lids, the at least one second connecting member (43) being biased between a locked position in which the elastic element (18) is biased so that it exerts a predetermined axial pressure on the friction device, and is movable to an unlocked position in which the elastic element is in the rest position and the friction device is rotatable relative to the covers (15), - a connector (40) suitable for connecting the torsional vibration damper (3) to the torque limiter (4). Device (1) after claim 1 , the at least one second connecting element (43) being a screw engaging in a thread (45) formed on one of the caps (15) of the torque limiter (4), the screw having a threaded shank whose thread has an axial Distance (D43) which is greater than an axial pinch distance of the elastic element (18). Device (1) according to one of the preceding claims, in which the torque limiter (4) is dry-running. Device (1) according to one of the preceding claims, in which the torsional vibration damper (3) and the torque limiter (4) are axially aligned with one another. Device (1) according to any one of the preceding claims, in which the connection piece forms one of the covers (15) of the torque limiter (4). Device (1) according to one of the preceding claims, further comprising at least one third connecting member (44) suitable for directly non-rotatably connecting the first output element (41) of the torsional vibration damper (3) and the connecting piece, the at least one third connecting element (44) is a screw. Device (1) according to any one of the preceding claims, further comprising an additional torsional vibration damper at least partially radially aligned with the at least one mechanical energy storage member (9) of the torsional vibration damper (3). Device according to the preceding claim, in which the additional torsional vibration damper is a pendulum damper (2) comprising a pendulum support (25) rotatable about the axis (X) and at least one pendulum mass (26) which is free and guided relative to the pendulum support (25). can move, wherein the first output element (10) of the torsional vibration damper (3) forms the pendulum support (25). Vehicle drive chain with a device (1) according to one of the preceding claims. Method for assembling and/or maintaining a device according to one of Claims 1 until 8th , comprising the steps of: - moving the at least one second connecting member (43) from the locked position to the unlocked position, - angularly displacing the second output element (41) until the at least one second window (42) coincides with the at least one first window ( 32) of the first input element (31), - moving the at least one second connecting member (41) from the unlocked position to the locked position.

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