Device for damping torsional oscillations

Abstract

A device (22) for damping torsional oscillations, comprising: at least one support (24) which is rotationally displaceable about an axis (X); at least one pendulum assembly (25) comprising at least one pendulum mass, the pendulum assembly being movable relative to the support; at least one rolling member (11), each interacting with at least one first raceway (12) defined by the support and with at least one second raceway (13) defined by the pendulum assembly, the displacement of the pendulum assembly relative to the support being guided by at least one of these rolling members; and at least one friction member (50) carried by the pendulum assembly for generating hysteresis in all or part of the relative displacement of the pendulum assembly and the support.

Description

[0001] This application is a divisional application of the application filed on February 11, 2018, with application number 201880009023.5 and invention title "Device for Damping Torsional Oscillation". Technical Field

[0002] This invention relates to a device for damping torsional oscillations, particularly for use in motor vehicle transmission systems. Background Technology

[0003] In such applications, devices for damping torsional oscillations can be integrated into a torsional damping system that can selectively connect an internal combustion engine to a gearbox clutch in order to filter vibrations caused by engine irregularities. Such a system is, for example, a dual-mass flywheel.

[0004] As a variation, in this application, the device for damping torsional oscillations can be integrated into the friction disc of the clutch or the hydraulic torque converter, or integrated into the hybrid power system or associated with a flywheel rigidly connected to the vehicle crankshaft.

[0005] Such devices for damping torsional oscillations typically utilize a support and one or more pendulum assemblies movable relative to the support. The displacement of each pendulum assembly relative to the support is guided by two rolling members, each of which interacts with a raceway defined by the support on one hand and with a raceway defined by the pendulum assembly on the other. Each pendulum assembly includes, for example, two pendulum masses riveted to each other.

[0006] At low speeds, these devices are not centrifugal, so they are very sensitive to gravity, which can lead to undesirable displacement of the pendulum assembly and thus metallic noise due to the impact between the pendulum assembly and the support.

[0007] To address this problem, for example, as known from application DE 10 2012 221 103, springs are provided between two circumferentially adjacent pendulum assemblies, such that the pendulum assemblies connected in this way resist the force of gravity applied to them when rotational motion is imparted to the device. Inserting these springs involves configuring additional receptacles in the pendulum assemblies or providing suitable fastening devices on these assemblies, which is expensive and complex. Furthermore, the insertion of springs causes the appearance of additional resonant frequencies.

[0008] The insertion of the spring may also require the construction of an open cut in the support of the device, thus reducing the deflection of the pendulum assembly. Furthermore, the spring dimensions must be correctly set, and the spring's properties cannot be guaranteed to remain unchanged over time. Summary of the Invention

[0009] The purpose of this invention is to reduce the effect of gravity on the pendulum assembly, especially at low rotational speeds, while eliminating all or some of the aforementioned disadvantages.

[0010] This invention is achieved by means of a device for damping torsional oscillations, comprising:

[0011] - At least one support member capable of rotational displacement about an axis.

[0012] - At least one pendulum component, including at least one pendulum mass, the pendulum component being movable relative to a support.

[0013] - At least one rolling member, each rolling member interacting with at least one first raceway defined by a support and at least one second raceway defined by a pendulum assembly, the displacement of the pendulum assembly relative to the support being guided by at least one of these rolling members.

[0014] The device includes at least one friction member carried by the pendulum assembly for generating hysteresis in all or part of the relative displacement of the pendulum assembly and the support.

[0015] This prevents impacts between the pendulum assembly and the support, especially impacts caused by gravity. As the support rotates, the pendulum assembly continuously occupies the highest position around the axis of rotation of the support, and the presence of the friction component thus limits or slows down the downward displacement of the pendulum assembly in response to gravity.

[0016] For the purposes of this application:

[0017] - "Axially" means "parallel to the axis of rotation of the support".

[0018] - "Radially" means "along an axis that belongs to a plane orthogonal to the axis of rotation of the support and intersects the axis of rotation of the support";

[0019] - "Angled" or "circumferential" refers to "around the axis of rotation of the support";

[0020] - "Orthogonal" means "perpendicular to the radial direction".

[0021] The present invention also relates to the aforementioned friction member considered separately.

[0022] The friction component can produce hysteresis regardless of the relative positions of the support and the pendulum assembly.

[0023] The friction member can be arranged axially between the pendulum mass and the support. Therefore, the axial location of the friction member between the pendulum mass assembly and the support means that the friction member can also have an insertion function to prevent axial impact between the pendulum assembly and the support.

[0024] According to the first variation, the friction member is axially larger than the axial space between the pendulum mass and the support. The axial dimension can be the axial distance between the two axial ends. The friction member can therefore be compressed between the pendulum mass and the support.

[0025] Specifically, the friction member may include an axially positioned protrusion that contacts the support member. This axial protrusion may be bubble-shaped. The axial protrusion can be formed by trapping air into the friction member during its manufacture.

[0026] Alternatively, the axial protrusion can have any shape suitable for generating hysteresis, such as a wave or a pin. Alternatively, the axial protrusion can also be an insert member fixed to the friction member. Multiple axial protrusions can be arranged on the friction member.

[0027] Alternatively or in combination, the friction member may include at least one thinned region to cause local warping of the friction member to contact the support. Warping can be achieved through plastic deformation of the thinned region. The friction member may include cuts, advantageously two cuts, extending from the profile of the friction member and approaching one of them relative to the other to define the thinned region. Warping may occur in the circumferential end region of the friction member.

[0028] Alternatively or in combination, the friction member may include at least one locating axial region to at least partially contact the rolling member. The support region may have all shapes suitable for generating hysteresis, such as wavy or folded shapes. Multiple support regions may be arranged on the friction member. The axial support region allows hysteresis to be generated across all displacements of the rolling member.

[0029] The support area may include recesses.

[0030] Specifically, axial stress can be applied to the support region of the friction member, at least on the lateral region of the axial face of the rolling member. The axial stress presses the rolling member against the opposing pendulum mass. The axial stress can be applied to the lateral region, the surface and location of which can vary depending on the position of the rolling member relative to the support and the pendulum mass. The order of magnitude of the axial stress can be between 1 and 5 N (Newtons).

[0031] Alternatively or in combination, the friction member may include at least one locally folded region to contact the rolling member. The friction member may include at least one thinned region to locally fold the friction member to contact the rolling member. The folded region can be obtained by plastic deformation of the thinned region. The friction member may include a cut and a fold, plastic deformation, or warping of the region between the cut and the contour of the friction member; alternatively, two parallel cuts and a fold of the region between the two parallel cuts, preferably two circumferentially offset series of two parallel cuts. The fold may occur on the circumferential end region of the friction member.

[0032] The folded region of the friction member can be subjected to axial stress only in the radially inner region of the axial face of the rolling member. The axial stress presses the rolling member against the opposing pendulum mass. The axial stress is generated as close as possible to the interaction region between the rolling member and the raceway defined by the support. The axial stress can be applied relative to the rolling member in the radially inner region, extending over the first 20% of the rolling member's diameter, preferably the first 10%. The order of magnitude of the axial stress can be between 1 and 5 N (Newtons).

[0033] According to the second variation, the progressive member is axially arranged between the friction member and the pendulum mass to force the friction member into contact with the support or at least one rolling element. In this variation, the friction member is compressed between the progressive member and the support, not between the pendulum mass and the support. In contrast to the first variation, the shape of the friction member does not allow for hysteresis, but an additional portion arranged between the pendulum mass and the friction member allows for hysteresis.

[0034] A progressive element allows for the adaptation of the pendulum mass to a friction member, using an insert member solely for preventing axial impact between the pendulum assembly and the support member from entering the friction member, thus limiting or slowing the downward displacement of the pendulum assembly in response to gravity. The progressive element can be a sheet of metal including folds or corrugations to impart elasticity to the progressive element, such as two folds. The folds can extend substantially radially between the inner and outer peripheries of the progressive element. These folds can define multiple surfaces oriented in different directions. In other cases, the progressive element can be wholly or partially corrugated.

[0035] The progressive component can match the profile of the friction component, so the progressive component and the friction component have the same general shape.

[0036] Alternatively, the progressive component may include a spring or elastomeric part.

[0037] The progressive member can be held on a support or at least one rolling element, wherein the fastening area of ​​the friction member is on the pendulum mass. The reciprocating axial action of the support on the friction member allows the progressive member to be held between the pendulum mass and the friction member. The fastening area prevents the progressive member from being released during assembly steps or during high-speed acceleration of the support.

[0038] In addition to its fastening area, the friction component may also include an insertion area axially disposed between the pendulum mass and the support.

[0039] According to the first variation, the insertion region can be a flat surface from which axial protrusions, warped portions, support regions, or folded regions extend. According to the second variation, the insertion region can be forced into contact with the support. The insertion region can be locally offset from the pendulum mass via a progressive member to contact the support.

[0040] The fastening region may extend through the progressive member. The fastening region may include at least two fastening tabs and a reinforcement connecting these two tabs. The fastening region may extend between an end exposed from the insertion region and a free end, with each fastening tab extending between these ends. The reinforcement may connect the tabs at the ends exposed from the insertion region. The reinforcement may allow the friction member to be properly positioned on the pendulum mass, and ultimately, to center the friction member on the pendulum mass.

[0041] Each fastening tab may include a hook for locking the friction element onto the pendulum mass.

[0042] The friction member may include two types of fastening regions, each comprising two tabs oriented in the same direction. Each type of orientation is different and advantageously perpendicular to each other. This allows the friction member to be well secured to the pendulum mass and facilitates the fabrication of the fastening regions. The fastening regions can be positioned such that the friction member can be offset from the pendulum mass by 0.5 to 5 times the thickness of the friction member.

[0043] The progressive member may include an opening around each fastening region. Alternatively, the progressive member may include at least one connection region cooperating with the friction member or the pendulum mass to prevent any relative movement between them. In particular, the progressive member may cooperate with the fastening region of the friction member, for example by associating two cylindrical concentric protrusions from each member. Independently or additionally, the progressive member may include at least one edge cooperating with the inner or outer periphery of the pendulum mass to radially retain the progressive member.

[0044] Alternatively, the fastening area of ​​the friction components can be an opening. Each friction component is rigidly connected to one of the pendulum masses by a riveting or bolting connection through the opening.

[0045] Friction components can be made of plastic. These materials are particularly well-suited because they are not abrasive to the metal of the support, maintain low wear characteristics, and their coefficient of friction with the metal is sufficient to prevent impacts between the pendulum assembly and the support.

[0046] Alternatively, the friction element can be made of metal. The metal sheet may include folds or corrugations to give the friction element elasticity.

[0047] Friction components can be elastic. The elasticity of friction components can absorb impacts.

[0048] According to a first embodiment of the present invention, the device includes a single support member, and the pendulum assembly includes a first pendulum mass and a second pendulum mass axially spaced apart from each other, the first pendulum mass being axially arranged on a first side of the support member, and the second pendulum mass being axially arranged on a second side of the support member.

[0049] At least one component connects the masses of the first pendulum and the masses of the second pendulum, such that the masses are paired.

[0050] The device also includes two friction components, each axially positioned between a pendulum mass and a support.

[0051] Alternatively, the device may include at least one friction member disposed axially only between one of the pendulum masses and the support member.

[0052] The device may include two different circumferentially offset friction members, each of which is associated with one of the rolling members.

[0053] Such connecting members are press-fitted, for example, into openings disposed in a pendulum mass via each of their axial ends. As a variation, the connecting members can be welded to each pendulum mass via their axial ends. The connecting members can also be bolted or riveted to each pendulum mass.

[0054] In a first variation of the first embodiment, the connecting member may define a first raceway for guiding the movement of the pendulum assembly relative to the support.

[0055] According to this first variation of the first embodiment, the pendulum assembly may include two connecting members that pair the first and second pendulum masses, each connecting member defining a first raceway that interacts with one of two rolling members, the first raceway guiding the displacement of the pendulum assembly relative to a support. Each rolling member here interacts with a single raceway on the side of the pendulum assembly. A peripheral region of the connecting member, such as a portion of the radially outer surface of the connecting member, defines the raceway, for example, integral with the pendulum assembly. In this case, the rolling member may also cooperate with another first raceway defined by the support, specifically defined by a portion of the periphery of a window disposed in the support, where the connecting member is arranged.

[0056] According to this first variation of the first embodiment, each rolling member can be stressed only under compression between the raceway defined by the support member and the raceway defined by the swing assembly, as described above. These raceways interacting with a given rolling member can at least partially face each other radially, i.e., there exists a plane perpendicular to the axis of rotation in which the two raceways extend.

[0057] According to this first variation of the first embodiment, the friction members can be axially arranged between the pendulum mass bearing them and the rolling members for all or part of the relative position of the pendulum assembly and the support. This allows for axial guidance of the rolling members and prevents undesirable axial impacts, especially when these elements are made of metal.

[0058] According to a second variation of the first embodiment, when a support member is still present, and when the pendulum assembly includes two pendulum masses paired together, each rolling member can interact with two different raceways defined by the pendulum assembly, one of which is defined by the first pendulum mass and the other of which is defined by the second pendulum mass.

[0059] According to this second variation, each connecting member is, for example, a rivet. The rivet can be received in a cavity of the support member, where the rolling member is not yet received. As previously described, a portion of the periphery of the window disposed in the support member can define the raceway of the support member.

[0060] According to this second variation of the first embodiment, each rolling member may sequentially include, axially:

[0061] - The region arranged in the cavity of the first pendulum mass and interacting with the raceway formed by a portion of the periphery of the cavity;

[0062] - The area arranged in the window of the support and interacting with the raceway formed by a portion of the periphery of the window; and

[0063] - The region arranged in the cavity of the second pendulum mass and interacting with the raceway formed by a portion of the periphery of the cavity.

[0064] This device may differ from a device that includes a single support member. According to a second embodiment of the invention, the device includes two axially offset supports, with the pendulum assembly axially arranged between the two supports, each support defining a first raceway for interacting with the same rolling member.

[0065] In this second embodiment, the device may include two friction members, each axially disposed between the pendulum mass and a support member.

[0066] Alternatively, the device may include at least one friction member disposed axially only between the pendulum mass and one of the supports.

[0067] The device may include two different circumferentially offset friction members, each of which is associated with one of the rolling members.

[0068] The pendulum assembly may include at least one pendulum mass, particularly multiple pendulum masses or a single pendulum mass preferably rigidly connected, preferably arranged entirely axially between two supports. The pendulum mass (one or more) is axially clamped between the two supports. The two supports are rigidly connected, for example, by a connector such as a riveted joint, which is radially inward relative to the pendulum assembly.

[0069] The shape of the raceway allows each pendulum component to be positioned relative to the support.

[0070] - It can be translated and displaced around an imaginary axis parallel to the axis of rotation of the support member, and...

[0071] - The motion that allows rotational displacement around the center of gravity of the pendulum assembly is also known as "combined motion".

[0072] As a variation, the shape of the aforementioned raceway allows each pendulum assembly to be translated relative to the support only about an imaginary axis of rotation parallel to the support.

[0073] The present invention also provides a dual-mass flywheel, comprising:

[0074] - The main flywheel used for fastening to the crankshaft.

[0075] - The secondary flywheel is connected to the main flywheel via multiple flexible return components, and

[0076] - As described above, the device for damping torsional oscillations has a support member specifically attached to the secondary flywheel.

[0077] The device used to dampen torsional oscillations can alternatively be a component of a transmission system in a motor vehicle that is not a dual-mass flywheel. This component can be a hydraulic torque converter, a friction clutch disc, a dry or wet dual-clutch or wet single-clutch, a flywheel integrated with the crankshaft, or a component forming part of a hybrid powertrain.

[0078] In all of the above, the device for damping torsional oscillations can be configured such that the displacement of the pendulum assembly allows filtering of the excitation sequence of the internal combustion engine of the vehicle to which the device is integrated, particularly having two, three, or four cylinders.

[0079] In all of the above, the device may include, for example, two to eight pendulum components, particularly three or six pendulum components. All these pendulum components may be circumferentially continuous. Therefore, a device for damping torsional oscillations may include multiple planes perpendicular to the axis of rotation, in which all pendulum components are arranged.

[0080] In all of the above, each support can be implemented as a single component, for example, which is entirely metal.

[0081] In all of the above, the device may include:

[0082] - At least one first pendulum component that allows filtering of the first-order value of the torsional oscillation, and

[0083] - At least one second pendulum component that allows filtering of second-order values ​​of torsional oscillations that differ from the first-order values.

[0084] When the device for damping torsional oscillations is part of a component, the support for the device for damping torsional oscillations can be one of the following:

[0085] - The flange of the component;

[0086] - Guide gaskets for components;

[0087] - Phase gaskets for components;

[0088] - A support member that differs from the aforementioned collar, guide washer, and phase washer.

[0089] The present invention also provides a vehicle powertrain, comprising:

[0090] - Internal combustion engines used for vehicle propulsion, particularly having two, three, or four cylinders; and

[0091] - Transmission system components as defined above. Attached Figure Description

[0092] The invention will be better understood by reading the following description of its non-limiting exemplary embodiments and by examining the accompanying drawings, in which:

[0093] Figure 1 A two-mass flywheel is depicted, which includes a device for damping torsional oscillations.

[0094] Figure 2 An example of a device according to a first embodiment is shown in part.

[0095] Figure 3 An example of a device according to a first embodiment is shown in part.

[0096] Figure 4 An example of a device according to the second embodiment is shown in part, and

[0097] Figure 5 and 6 An example of a friction member according to the first variant is shown.

[0098] Figure 7 Another example of a friction member according to the first variant is shown.

[0099] Figure 8 and 9 Two devices with friction members according to a second variant are shown.

[0100] - Figure 10 and 11 Another example of a friction member according to the first variant is shown.

[0101] - Figure 12 An example of a device according to a first embodiment is shown in part, which includes, according to Figure 10 and 11 Friction components,

[0102] - Figure 13 An example of a device according to a first embodiment is shown in part, which includes, according to Figure 14 Friction components,

[0103] - Figure 14 Another example of a friction member according to the first variant is shown, and

[0104] - Figure 15a and 15b Another example of a friction member according to the first variant is shown. Detailed Implementation

[0105] Figure 1 A dual-mass flywheel 1 is shown as part of the vehicle's drivetrain. The drivetrain also includes an internal combustion engine with two, three, or four cylinders.

[0106] The dual-mass flywheel 1 includes a main flywheel 3 and a secondary flywheel 6 connected to the main flywheel. The main flywheel 3 includes a flange 5 and a ring gear 7. The main flywheel can be fastened to the crankshaft of an internal combustion engine.

[0107] The secondary flywheel 6 includes a flange 8 that interacts with the elastic return member 9. In the described embodiment, the elastic return member 9 is a spring. The spring 9 allows the secondary flywheel 6 to rotate relative to the main flywheel 3 about axis X.

[0108] Figure 1 The flange 8 is shown riveted to the hub 10 of the secondary flywheel 6. The hub 10 has splines to allow it to be fitted onto the shaft.

[0109] The dual-mass flywheel 1 includes a device 22 for damping torsional oscillations, which is of the pendulum type.

[0110] The device 22 includes a support member 24, which in this example is riveted to a connecting plate 29 by rivets 32, the connecting plate 29 being riveted to a hub 10 and to a flange 8 by rivets 30.

[0111] The device also includes a pendulum assembly 25. (Now refer to...) Figure 2 , 3 Sections 4 and 5 describe three different examples of a device 22 for damping torsional oscillations. These three devices can be integrated into... Figure 1 In a dual-mass flywheel.

[0112] exist Figure 2In the middle, device 22 is in a neutral position, that is, it does not filter the torsional oscillations caused by the irregularities of the internal combustion engine transmitted by the transmission system.

[0113] In the example under consideration, six pendulum components 25 are provided, evenly distributed around the perimeter of axis X.

[0114] In the example under consideration, the support 24 is generally shaped as a ring with two opposing sides 26 (which are planes).

[0115] like Figure 2 As shown, in the example under consideration, each pendulum component 25 includes:

[0116] - Two pendulum masses 27, each mass 27 extending axially towards one side 26 of the support member 2; and

[0117] - Two connecting members 40 rigidly connect two pendulum masses 27.

[0118] In the example under consideration, the connecting member 40 (also referred to as the “spacer”) of the same pendulum assembly 25 is offset at an angle. Each assembly 25 extends at an angle between two circumferential ends corresponding to the circumferential ends of the pendulum mass 27 of that assembly.

[0119] exist Figure 2 In the example, each connecting member 40 is press-fitted into an opening in a pendulum mass 27 disposed in the pendulum assembly 25 so as to rigidly connect the two pendulum masses 27 to each other.

[0120] In another alternative, each end of the connecting member 40 is rigidly connected to a pendulum mass 27 by welding, riveting, or bolting.

[0121] The device 22 for damping torsional oscillations also includes a rolling member that guides the movement of the pendulum assembly relative to the support 24. The rolling member here is a roller.

[0122] In the example described, the movement of each pendulum component 25 relative to the support 24 is guided by two rolling members. This movement is, for example, a combined movement.

[0123] Each rolling member is received in a window configured in the support 24. Each window has a continuous perimeter, and a portion of the perimeter defines a first raceway integral with the support 24, on which one of the rolling members received in the window will roll.

[0124] exist Figure 2In the example, each window also receives a connecting member 40 of the pendulum assembly 25. Each connecting member 40 defines a second raceway integral with the pendulum assembly 25, to which one of the rolling members rolls to guide the position of the pendulum assembly 25 relative to the support 24. The second raceway is defined, for example, by a region of the radially outer surface of the connecting member 40.

[0125] Figure 2 The device 22 also includes an abutment damping member 35 for damping impacts associated with the pendulum assembly 25 abutting against the support member 24. Figure 2 In the example, each connecting member 40 is associated with such an abutment damping member 35. The abutment damping member 35 is configured, for example, to be compressed between the edges of the window receiving the rolling member and between the radially inner edges of the connecting member 40.

[0126] The abutment damping member includes axial protrusions received within holes disposed inside the pendulum mass. Each protrusion allows the abutment damping member to be attached to the pendulum mass 27.

[0127] Figure 3 Another variant of the device 22 is shown. The device 22 still includes a single support 24 and multiple pendulum assemblies 25, each of which still includes two rigidly connected pendulum masses 27.

[0128] With reference Figure 2 Conversely, as described, each window 45 arranged in the support 24 does not accommodate rolling members or connecting members 40. Each connecting member 40, in this case a rivet, is accommodated in a cavity that does not accommodate any rolling members.

[0129] exist Figure 3 In the example, each rolling member 11 includes, axially, the following components in sequence:

[0130] - The region arranged in the cavity of the first pendulum mass 27 and interacting with the second raceway formed by a portion of the periphery of the cavity;

[0131] - The area arranged in the window 45 of the support 24 and interacting with the first raceway formed by a portion of the periphery of the window; and

[0132] - The region arranged in the cavity of the second pendulum mass 27 and interacting with the second raceway formed by a portion of the periphery of the cavity.

[0133] Figure 4 A device 22 according to another embodiment is shown. (Compared to...) Figure 2 and Figure 3Instead, the device 22 includes two axially offset supports 24, with the swing assembly 25 axially arranged between the two supports 24, each support defining a first raceway 13 for interacting with the same rolling member.

[0134] In this example, each pendulum assembly 25 may include a single pendulum mass 27 arranged axially between two supports 24. The pendulum mass(s) are then axially clamped between the two supports. The two supports 24 are rigidly connected, for example, by a connector such as a riveted joint, which is located radially inward relative to the pendulum assembly 25.

[0135] exist Figure 4 In the example, each rolling member 11 includes, axially, the following components in sequence:

[0136] - The area arranged in the window 45 of the first support 24 and interacting with the first raceway 12 formed by a portion of the periphery of the window;

[0137] - The region arranged in the cavity of the pendulum mass 27 and interacting with the second raceway 13 formed by a portion of the periphery of the cavity; and

[0138] - The area arranged in the window 45 of the second support 24 and interacting with the first raceway formed by a portion of the periphery of the window.

[0139] exist Figure 12 In the example, each rolling member 11 comprises axially continuous components:

[0140] - A region arranged in the window of the support 24 and interacting with a first raceway formed by a portion of the periphery of the window and a second raceway formed by a portion of the connecting member 40, the region having a first surface 120 and an opposing second surface 121 that interact with the first pendulum mass 27 and the friction member 50; and

[0141] - A region or pin 111 extending from the second surface, which is arranged in the window of the second pendulum mass 27 and interacts with the first raceway formed by a portion of the periphery of the window.

[0142] Figures 5 to 15b Examples of five different variations of the friction member 50 are shown, which can be derived from... Figures 1 to 4 Each pendulum mass 27 described above is supported. Specifically, at least one friction member 50 exists between each of the pendulum masses 27 or one of the pendulum masses 27 and one of the support members 24. For example, as Figure 8 and 9 As shown, there is a friction member 50 between each pendulum mass 27 and the support member 24.

[0143] One of the pendulum masses 27 of the oscillating assembly 25 can carry at least one friction member 50 on the side relative to the support member 24. Figure 4 In this embodiment, each pendulum mass 27 can support two friction members 50 on each side. Figure 12 In this configuration, only one pendulum mass 27 of each pendulum assembly 25 can bear two friction members 50 on one side of the support member 24, and in... Figure 13 In this configuration, only one pendulum mass 27 of each pendulum assembly 25 can bear a friction member 50 on one side of the support member 24.

[0144] In all examples, the friction member 50 produces hysteresis in all relative displacements of the pendulum assembly 25 and the support member 24, regardless of the relative positions of the support member 24 and the pendulum assembly 25.

[0145] This prevents impacts between the pendulum assembly 25 and the support 24, especially impacts caused by gravity. As the support 24 rotates, the pendulum assembly 25 continuously occupies the highest position around the axis of rotation of the support, and the presence of the friction member 50 thus limits or slows down the downward displacement of the pendulum assembly in response to gravity.

[0146] The friction member 50 may be made of a damping material such as plastic. Alternatively, the friction member 50 may be made of a resilient metal.

[0147] In all examples, the friction member 50 is axially arranged between a pendulum mass 27 and a support member 24. Therefore, the axial location of the friction member 50 between the pendulum mass assembly and the support member means that the friction member can also have an insert function to prevent axial impact between the pendulum assembly and the support member.

[0148] In all the described examples, each friction member 50 includes at least one fastening region 52 on the pendulum mass 27 and an insertion region 53 axially disposed between the pendulum mass 27 and the support member 24. For example, in Figures 5 to 9 In the middle, each friction member 50 includes four fastening areas 52, in Figures 10 to 12 In the middle, each friction member 50 includes two fastening areas 52, in Figure 13 and 14 In the middle, each friction member 50 includes eight fastening areas 52, and in Figure 15a and 15b In this context, each friction component 50 includes a fastening area 52.

[0149] The insertion region 53 extends radially outward of the connecting member between two circumferential ends 54. The insertion region also includes a radially inner end 55 circumferentially between the ends 54. The insertion region also includes a radially upper end 55b circumferentially between the ends 54.

[0150] For example, each fastening region 52 may include two fastening tabs 58 and a reinforcement 59 connecting the two tabs. The fastening region 52 extends between an end exposed from the insertion region 53 and a free end, and each fastening tab 58 extends between these ends. The reinforcement 59 connects the tab 58 at the end of the tab 58 exposed from the insertion region 53.

[0151] Each fastening tab 58 includes a hook for locking the friction member 50 onto the pendulum mass 27.

[0152] In a part Figure 5 As shown, and another part is in Figure 9 In the example shown, the friction member 50 includes two types of fastening regions, each comprising two tabs 58 oriented in the same direction. Each type of orientation is perpendicular to each other. The radially inner end 55 includes two fastening regions 52 of the first type, while each circumferential end 54 includes one fastening region 52 of the other type.

[0153] Alternatively, each fastening region 52 may include an opening. Each friction member 50 is rigidly connected to at least one rigid mass 27 by a riveting 52a or bolting through the opening.

[0154] In a part Figure 5 and 6 As shown, and another part is in Figure 7 , 10 In the examples shown in 11, 14, 15a and 15b, the friction member 50 is axially larger than the axial space between the pendulum mass 27 and the support member 24.

[0155] exist Figure 5 and 6 In the example shown, the friction member 50 includes an axially oriented protrusion 60 positioned in contact with the support member 24. An insertion region 53 is a flat surface from which the axial protrusion 60 extends. The axial protrusion 60 has a bubble shape. This axial protrusion can be formed by trapping air in the cavity 61 of the friction member during its manufacture.

[0156] In the described example, the axial protrusion 60 is located on the friction member, between the circumferential ends 54 and radially outward of the radially inner end 55. The axial protrusion is positioned to always contact the support, regardless of the relative positions of the support 24 and the pendulum assembly 25.

[0157] exist Figure 7In the example shown, the friction member 50 includes two thinning regions 56 to cause localized camber of the friction member in contact with the support. The camber is achieved through plastic deformation of the thinning regions 56. The camber is located on each circumferential end region 54 of the friction member. The friction member 50 includes cutouts 57, each thinning region having two cutouts extending from the profile of the friction member 50 and approaching one of them relative to the other to define the thinning region. In this example, the cutouts of each thinning region converge at one of the fastening regions 52. The cutouts 57 of each thinning region are located on both sides of the fastening region 52.

[0158] In relation to Figure 10 and 11 In the example described, the friction member 50 may include at least one thinning region 56 to partially fold the friction member 50 to contact the rolling member 11. Alternatively or complementaryly, the friction member 50 may include at least one cut 157. The at least one cut 157 may extend in the insertion region 53 near the upper end 55b. The cut 157 may be adapted to partially fold the friction member 50 to contact the rolling member 11. The folding is achieved through plastic deformation of the thinning region 56 and / or the region near the cut 157. The fold is located on the upper end 55b region of the friction member. The folded region 150 may be located between the cut 157 and the upper end 55b, and the folded region 150 is axially offset relative to the insertion region 53 of the friction member 50 to contact the rolling member 11.

[0159] In relation to Figure 14 In the example described, the friction member 50 may include two thinning regions 56 to partially fold the friction member 50 to contact the rolling member 11. Alternatively or complementaryly, the friction member 50 may include four cuts 157, arranged in pairs parallel to each other. Preferably, two series of two parallel cuts are offset circumferentially. A series of two parallel cuts 157 may be present on each circumferential end region 54. An insertion region 53 between two cuts 157 of the series of parallel cuts 157 may fold to contact the rolling member 11. The folded region 150 is obtained by plastic deformation of the thinning regions 56 and / or the region between two cuts 157 of the series of parallel cuts 157. The folded region 150 is located on the inner end region 55 of the friction member 50. The folded region 150 may be axially offset relative to the insertion region 53 of the friction member 50 to contact the rolling member 11.

[0160] Each folded region 150 of the friction member 50 may be subjected to axial stress only in the radially inner region of the rolling member 11 with respect to the first axial surface 120 of the friction member 50. The axial stress presses the rolling member 11 against the opposing pendulum mass 27. The axial stress is generated as close as possible to the interaction region between the rolling member 11 and the raceway defined by the support member 24. The axial stress may be applied relative to the rolling member 11 in the radially inner region, which extends over the first 20% of the diameter of the rolling member 11, preferably the first 10%. The order of magnitude of the axial stress may be between 1 and 5 N (Newtons).

[0161] In relation to Figure 15a and 15b In the example described, the friction member 50 may include a support region 160 to at least partially contact the rolling member 11. The support region 160 may include a recess 161. Preferably, the support region 160 may be on one of the circumferential end regions 54. The support region 160 may be obtained by plastic deformation. The support region 160 may be axially offset relative to the insertion region 53 of the friction member 50 to contact the rolling member 11.

[0162] Specifically, the support region 160 of the friction member 50 can apply axial stress at least on the side region of the axial surface 120 of the rolling member 11. The side region can be a portion of the first axial surface of the rolling member 11 with respect to the friction member 50. The axial stress can press the rolling member 11 against the opposing pendulum mass 27. The axial stress can be applied to the side region, the surface and location of which can vary depending on the position of the rolling member 11 relative to the support member 24 and the pendulum mass 27. The order of magnitude of the axial stress can be between 1 and 5 N (Newtons).

[0163] exist Figure 8 and Figure 9 In the example shown, for each pendulum assembly, a progressive member 70 is axially arranged between a friction member 50 and each pendulum mass 27 to force an insertion region 53 into contact with a support member 24. A fastening region 52 passes through the progressive member 70. The insertion region 53 is partially offset from the pendulum mass 27 by the progressive member 70 to contact the support member 24. The progressive member 70 may be a sheet of metal and includes folds 72 for imparting elasticity. The folds 72 extend substantially radially between the inner and outer peripheries of the progressive member 70. These folds define multiple surfaces oriented in different directions to impart elasticity to the progressive member.

[0164] The contours of the progressive member 70 and the friction member 50 are matched.

[0165] The progressive member 70 is held on the support member 24 by the fastening area 52 of the friction member.

[0166] exist Figure 8 In the example shown, the friction member 50 does not lock onto the pendulum mass 27. The fastening region 52 is mounted on the pendulum mass 27 without play. The fastening region 52 is a cylindrical protrusion that cooperates with a hole in the pendulum mass 27. The progressive member 70 includes cylindrical protrusions 75, each cylindrical protrusion 75 surrounding a concentric protrusion of the friction member 50.

[0167] exist Figure 9 In the example described, the progressive member 70 includes an opening 78 surrounding each fastening region 52, as shown in the reference. Figure 5 and Figure 6 As described. The progressive member 70 also includes two outer edges 79 that cooperate with the outer periphery of the pendulum mass 27 and an inner edge 80 that cooperate with the outer periphery of the pendulum mass 27 in order to radially hold the progressive member.

[0168] This invention is not limited to the above-described contents.

[0169] In other undescribed examples, the device 22 for damping torsional oscillations may be integrated into a component of the transmission system that is not a dual-mass flywheel, such as a hydraulic torque converter, a friction clutch disc, a dry or wet dual clutch, a wet single clutch, or a flywheel integrated with the crankshaft, or a component that forms part of a hybrid powertrain.

[0170] In a known manner, such a component may include a torsional damper having at least one input element, at least one output element, and a circumferentially acting elastic return member inserted between said input element and output element, the terms "input" and "output" being defined relative to the direction of torque transmission from the vehicle's internal combustion engine toward the vehicle's wheels. The support member 24 of device 22 may be constructed as follows:

[0171] - Input element of the torsional damper;

[0172] - An output element or intermediate phase element arranged between two series of springs in the damper; or

[0173] - A component that is rotatably connected to one of the aforementioned components and is different from it is, for example, a support specifically designed for device 22.

Claims

1. A device (22) for damping torsional oscillations, comprising: At least one single support member (24) capable of rotational displacement about axis (X); At least one pendulum assembly (25) movable relative to the single support (24), wherein the pendulum assembly (25) includes a first pendulum mass (27) and a second pendulum mass (27) axially spaced apart from each other, the first pendulum mass (27) being axially arranged on a first side (26) of the support (24), and the second pendulum mass (27) being axially arranged on a second side (26) of the support (24), and At least one component (40) connects the first pendulum mass (27) and the second pendulum mass (27) to pair the masses; At least one rolling member (11) interacts with at least one first raceway (12) defined by the single support (24) and at least one second raceway (13) defined by the pendulum assembly (25), the displacement of the pendulum assembly (25) relative to the single support (24) being guided by at least one of these rolling members (11); and At least one friction member (50) carried by the pendulum assembly (25), wherein the friction member (50) is axially arranged between one of the pendulum masses (27) and the single support member (24), characterized in that: The friction member (50) is elastic and configured to provide axial preload to produce hysteresis; The friction member (50) includes at least one partial and axially extending support region (160) or folded region (150) configured to directly contact the axial end face (120) of the rolling member (11) to apply axial stress thereon. as well as The support region (160) includes a recess (161) that is shaped to match the contour of the axial end face (120) of the rolling member (11), or the folded region (150) is formed by plastic deformation of the thinned region (56) or the cut region (157) of the friction member (50).

2. The apparatus according to claim 1, wherein, Regardless of the relative positions of the support and the pendulum assembly, the friction member (50) exhibits hysteresis.

3. The apparatus according to claim 1, wherein, It also includes a progressive member (70) axially arranged between the friction member (50) and the pendulum mass (27) to force the friction member (50) into contact with the support member (24) or at least one rolling member (11).

4. The apparatus according to claim 3, wherein, The progressive member (70) is a metal sheet, including folds (72) or wavy portions for imparting elasticity to the progressive member.

5. The apparatus according to claim 3 or 4, wherein, The progressive member (70) is held on the support or at least one rolling member (11) by means of the fastening area (52) of the friction member on the pendulum mass.

6. The apparatus according to claim 5, wherein, The friction member (50) includes a positioning axial protrusion (60) for contacting the support member (24).

7. The apparatus according to claim 1, wherein, The thinned region (56) causes the friction member to partially warp in contact with the support.

8. The apparatus according to claim 1, wherein, The device includes two different circumferentially offset friction members (50), each friction member being associated with one of the rolling members (11).

9. The apparatus according to claim 1, wherein, The friction member (50) is axially larger than the axial space between the pendulum mass (25) and the support member (24).

10. A dual-mass flywheel (1), comprising: - The main flywheel (3) is used to fasten to the crankshaft. - The secondary flywheel (6) is connected to the main flywheel (3) via multiple elastic return members (9), and - The device (22) as claimed in any one of claims 1 to 9, wherein the support of the device is specifically attached to the secondary flywheel.

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