Torsional damper assembly, a base for the torsional damper assembly, and a method for manufacturing a torsional damper.

Abstract

The present invention relates to a torsional damping device (1) comprising: - a first coaxial portion (5) and a second coaxial portion (6); - a spring (4) acting circumferentially between the first coaxial portion (5) and the second coaxial portion (6); - a plurality of seats (9), at least one seat (9) being a seat that can be mounted in a first orientation (O1) and a second orientation (O2), the seat (9) being mounted in the second orientation (O2) and having wear marks (101) caused by previous use in the first orientation (O1).

Description

Technical Field

[0001] The present invention relates to a torsional damping device, a seat for the torsional damping device, and a method for manufacturing a torsional damper. Background Technology

[0002] The damping device in question is of the type comprising two coaxial portions rotatably mounted relative to each other to resist a spring acting circumferentially between them.

[0003] This torsional damping device is particularly suitable for clutch friction, especially for motor vehicles, particularly trucks, or the flywheels of such motor vehicles, which are often referred to as dual-mass flywheels in this case.

[0004] The present invention particularly relates to a case in which a seat acts circumferentially between at least one end of at least one spring and each coaxial portion, the front of the seat pressing on the spring and the back of the seat pressing on one and / or another coaxial portion.

[0005] This device is specifically described in EP2094290, FR2627243, FR3079580, EP3026293 and EP0696694.

[0006] Such seats can be rotatably mounted relative to the first and second coaxial portions about an axis parallel to the axis of rotation of the damping device. Because they are pivotally mounted, the seats (sometimes called cups) allow the spring to operate under satisfactory conditions, even at full torque, particularly by maintaining parallelism between their ends.

[0007] Seats are typically made of steel, usually cast steel, and can optionally serve as supports for end pieces made of elastic or plastic materials. The end pieces act as stoppers under maximum torque until rotation is continuous, prior to being pressed by certain springs. They can also be made entirely of elastic or plastic materials, particularly through molding.

[0008] However, these seats are prone to wear and become hollow in the load-bearing area that contacts the first and second coaxial portions, particularly in the upper part of their pivot, i.e., the radially outward portion of the pivot. This localized wear on the upper part of the pivot is caused by friction between the seat and the first and second coaxial portions when the spring and seat are subjected to significant centrifugal force or significant pressure exerted by the torque transmitted between the first and second coaxial portions, or when returning to the intermediate position (or zero torque).

[0009] In other words, during use, the load-bearing area of ​​the seat will wear down, thin, and become hollow. This can lead to premature wear of the seat and failure of the torsional damping device. Summary of the Invention

[0010] This invention is specifically designed to improve the service life of the seat and reduce the cost of manufacturing the torsional damping device.

[0011] Therefore, the present invention relates to a torsional damping device, comprising:

[0012] - A first coaxial portion and a second coaxial portion, which are rotatably mounted relative to each other about a rotation axis (X);

[0013] - A spring that acts circumferentially between the first and second coaxial portions, such that they elastically resist relative rotation of the first and second coaxial portions about the axis of rotation (X).

[0014] - Multiple seats, each seat including a front portion that presses against the spring end and a back portion that presses against the first coaxial portion and / or the second coaxial portion.

[0015] According to a first aspect of the invention, one of the seats is a seat that can be mounted in a first orientation and a second orientation, and the seat is a wear seat exhibiting wear marks.

[0016] "Wear marks" refer to wear marks that are visible to the naked eye.

[0017] These wear marks may specifically correspond to the portion of the seat that was previously hollowed out, mounted in the first orientation, and pressed against the first and / or second coaxial portion of the worn damping device.

[0018] "Worn damping device" refers to a damping device that has been used on the first vehicle in circulation and is sent to the recycling channel due to a fault assumed or observed during its use on the first vehicle.

[0019] According to one embodiment, the wear seat is mounted on the second orientation and exhibits wear marks previously caused when used on the first orientation.

[0020] The seat can be initially installed in two different locations and can be reused in one of the two locations to extend its service life. The proportion of waste in the worn damping device is thus reduced. In other words, the seat can be:

[0021] - Used in the first orientation in the first damper during the first life cycle.

[0022] -Then, during the second life cycle, after being removed from the first damper, it is reused in the second damper in the second orientation.

[0023] Therefore, the damping device with a wear seat installed in the second orientation is cheaper, while having damping characteristics that are essentially equivalent to an equivalent damping device that only installs a new seat.

[0024] The torsional damping device associated with the second life cycle of the seat also has one or more of the following characteristics:

[0025] - The back of each wear seat includes a back surface and at least one bearing protrusion, which protrudes from the back surface and is arranged to press against a first coaxial portion and / or a second coaxial portion, with wear marks located on more than 90% or all of the at least one bearing protrusion.

[0026] - The back of each wear seat includes a back surface and at least one bearing protrusion, the at least one bearing protrusion projecting from the back surface and arranged to press against a first coaxial portion and / or a second coaxial portion, the at least one bearing protrusion comprising, when viewed in a plane perpendicular to the axis of rotation (X):

[0027] - Peak,

[0028] -First wall,

[0029] - A second wall, which is connected to the first wall by means of a peak and is located radially outside the first wall.

[0030] - Wear marks are partially or entirely located on the first wall.

[0031] - The wear marks on the first wall of the wear seat were caused during previous use when the seat was used in the first orientation (i.e., when the first wall of the seat in the first orientation corresponds to the radial outer wall of the bearing protrusion).

[0032] - The second wall can interact with the bearing portion formed on the first coaxial portion and / or the second coaxial portion, so that the wear seat is radially retained when subjected to centrifugal force.

[0033] - At high speeds of the torsional damping device within its normal operating range, the seat can be centrifuged, and the radial outer wall bearing the convex protrusion is pressed against the first coaxial portion and / or the second coaxial portion.

[0034] - At least one bearing protrusion extends in a direction parallel to the axis of rotation X.

[0035] The peak of the wear seat includes a dividing line separating the first and second walls. Therefore, during disassembly, it is easier to check whether the wear is concentrated only on the first wall, or more precisely, whether the wear extends to both the first and second walls. Thus, when the wear is concentrated only on the first wall on one side of the dividing line, the seat can be flipped for reuse. Conversely, if the wear spreads to both sides of the dividing line during the first use, the seat cannot be reused in a second orientation. Therefore, if the seat is to be reused in a second orientation, the line visually indicates the limit to which the wear mark must not be reached during the first use.

[0036] - The boundary can be a groove. The boundary can also be a line that passes through the peak of the seat.

[0037] - The boundary extends along an axis parallel to the rotation axis X. The peak may be a crown that extends along an axis parallel to the rotation axis X and separates the first wall and the second wall.

[0038] - The first and second walls extend in a direction parallel to the axis of rotation X.

[0039] - The second wall faces outwards radially, and is therefore radially held by the load-bearing portions formed on the first and / or second coaxial portions. The outwardly facing portions do not necessarily extend strictly in a circumferential direction, but may have a radial component.

[0040] - The wear marks on each wear seat are partially or entirely located on the exterior of the second wall. For example, more than 90% of the wear marks are located on the exterior of the second wall.

[0041] - The wear marks of each wear seat are partially or entirely located on the first wall.

[0042] - In a torsional damping device, the second orientation of the wear seat corresponds to a 180-degree rotation of the wear seat relative to its previous use in the first orientation. In other words, the wear seat is reusable both ways.

[0043] - The spring associated with the wear seat extends about the Y-axis.

[0044] The rotation axis Y' of the seat is located substantially on the extension of the Y-axis of the associated spring.

[0045] - The wear seat rotates about the seat's axis Y' between its first and second orientations.

[0046] - The rotation is 180 degrees.

[0047] - The wear seat includes a front end, which is arranged to press against the spring end.

[0048] - The front of the wear seat is arranged perpendicular to the Y-axis of the spring.

[0049] - The wear seat is a seat that pivots about an axis parallel to the rotation axis X of the damping device, and at least one bearing protrusion is a pivot lug.

[0050] - The wear seat includes a first axial clamping device and a second axial clamping device. The first axial clamping device includes a wall that axially clamps the wear seat relative to the first coaxial portion and the second coaxial portion. The second axial clamping device also includes a wall that axially clamps the wear seat relative to the first coaxial portion and the second coaxial portion. The first axial clamping device and the second axial clamping device are arranged on both sides of the pivot lug. The axial clamping wall of the first axial clamping device is arranged in the same plane as the axial clamping wall of the second axial clamping device.

[0051] The second orientation of the seat during its second use does not affect the axial clamping of the component. The wear seat has previously been used with a first axial clamping device located radially outside the pivot lug, and the wear seat is used in a torsional damping device with a second axial clamping device located radially outside the pivot lug.

[0052] - A pivot lug formed on the back of the wear seat is inserted into a first housing formed on a first coaxial portion and / or a second housing formed on a second coaxial portion, and the pivot lug is pressed into the first housing of the first coaxial portion and / or the second housing of the second coaxial portion.

[0053] - The pivot lug is the shape of the rod portion.

[0054] - The wear seat is made of metal, such as steel.

[0055] - One of the first and second coaxial portions includes two lateral washers rigidly connected to each other for rotating together about a rotation axis (X). The other of the first and second coaxial portions includes an intermediate washer arranged about the rotation axis (X) and axially located between the two lateral washers. The spring of the torsional damping device is arranged in the recesses of the intermediate washer and the lateral washer such that when the lateral washer and the intermediate washer of the damper are moved away from their relative angular rest positions, in other words, when they rotate relative to each other, the spring is circumferentially compressed.

[0056] - Both the first axial clamping device and the second axial clamping device include a first rib and a second rib, with the edge surface of the intermediate washer inserted between the first rib and the second rib.

[0057] - For each axial clamping device, the first rib includes an outer wall that can be axially pressed against by one of two lateral washers and an inner wall that can be axially pressed against by a middle washer.

[0058] - For each axial clamping device, the second rib includes an outer wall that can be axially pressed against another of the two lateral washers and an inner wall that can be axially pressed against the middle washer.

[0059] In other words, for each axial clamping device, the end faces of the two lateral washers are axially located on both sides of the two ribs, and the end face of the middle washer is axially located between the two ribs.

[0060] - The first axial clamping device and the second axial clamping device are symmetrical with respect to the rotation axis Y' of the wear seat, and are used to switch the wear seat from the first orientation to the second orientation.

[0061] - When viewed along the Y-axis of the spring, the profile of the wear seat has an axis of symmetry.

[0062] -According to one embodiment, the wear seat generally has an axis of symmetry.

[0063] -According to one embodiment, the axis of symmetry is the Y' axis of the seat or the Y-axis of the associated spring.

[0064] -According to one embodiment, the wear seat includes a mounting anti-misalignment device adapted to prevent the wear seat from being mounted in a torsional damping device in a first orientation.

[0065] - According to one embodiment, the symmetry of the wear seat is only disrupted by the installation of error-proofing devices and / or wear marks.

[0066] The present invention also relates to a seat (worn or otherwise) for a torsional damping device, comprising, on one hand, a front portion for pressing against one end of a spring, and on the other hand, a back portion for pressing against a first coaxial portion and / or a second coaxial portion of the torsional damping device, wherein the seat may be mounted in the torsional damping device in a first orientation and a second orientation.

[0067] The seat may include one or more of the following features:

[0068] - The back includes a back surface and at least one bearing protrusion, the at least one bearing protrusion projecting from the back surface and arranged to press against a first coaxial portion and / or a second coaxial portion, wherein, when viewed in a plane perpendicular to the axis of rotation (X), the at least one bearing protrusion includes:

[0069] - Peak,

[0070] -First wall,

[0071] - A second wall, which is connected to the first wall by means of a peak and is located radially outside the first wall.

[0072] - The first and second walls are arranged on both sides of an axis perpendicular to the back and passing through the peak.

[0073] - The supporting convex protrusion extends in a direction parallel to the rotation axis X.

[0074] The peak of the seat includes a boundary separating the first wall from the second wall. As described above, it is therefore easy to determine whether the wear marks affect both walls or only one wall.

[0075] - The dividing line is a groove.

[0076] - A seat that pivots about an axis parallel to the rotation axis X of the damping device, and at least one bearing protrusion is a pivot lug.

[0077] - The back is arranged in plane P, and the supporting convex part is a rod portion, which has a generally circular cross-section with a center C on one surface. The rod portion forms a pivotal element, and the axis of the rod portion passes through the center C of the rod portion and extends from plane P by a predetermined distance d, which is approximately not equal to zero.

[0078] - For the radius r of the basic circular cross section of the rod portion, d>r / 3, preferably d>r / 2, especially d>2r / 3, and especially d>r.

[0079] A base includes a first axial clamping device and a second axial clamping device. The first axial clamping device includes a wall relative to the first coaxial portion and the second coaxial portion axial clamping seat. The second axial clamping device also includes a wall relative to the first coaxial portion and the second coaxial portion axial clamping seat. The first axial clamping device and the second axial clamping device are arranged on both sides of the pivot lug. The axial clamping wall of the first axial clamping device and the axial clamping wall of the second axial clamping device are arranged in the same plane.

[0080] - The first axial clamping device and the second axial clamping device are symmetrical with respect to the rotation axis Y' of the seat, and are used to switch the seat from the first orientation to the second orientation.

[0081] - When viewed along the Y-axis, the profile of the seat has an axis of symmetry.

[0082] -According to one embodiment, the seat generally has an axis of symmetry.

[0083] - This includes the installation of error-proofing devices (poka-yoke).

[0084] A seat can, of course, include any features mentioned above related to torsional damping devices.

[0085] The present invention also relates to a torsional damping device, comprising:

[0086] - A first coaxial portion and a second coaxial portion, which are rotatably mounted relative to each other about a rotation axis X.

[0087] - A spring that acts circumferentially between the first and second coaxial portions, such that they elastically resist relative rotation of the first and second coaxial portions about the axis of rotation X.

[0088] - Multiple seats, each seat including a front portion that presses against the spring end and a back portion that presses against the first coaxial portion and / or the second coaxial portion.

[0089] At least one of the seats is the seat described above.

[0090] The device may include one or more of the following features:

[0091] - At least one of the seats is a wear seat and exhibits wear marks that were previously produced when used in the first orientation.

[0092] - Wear marks are partially or entirely located on the first wall.

[0093] - The wear marks of each wear seat are located partially or entirely on the outer side of the second wall.

[0094] - The wear marks of each wear seat are partially or entirely located on the first wall.

[0095] The second orientation of the seat corresponds to a 180-degree rotation of the seat relative to the first orientation.

[0096] The present invention also relates to a method for manufacturing a torsional damper, the torsional damper comprising a first coaxial portion and a second coaxial portion rotatably mounted relative to each other about a rotation axis X; a spring received in a recess in the first and second coaxial portions and acting circumferentially between the first and second coaxial portions such that they elastically resist relative rotation of the first and second coaxial portions about the rotation axis X; and a plurality of seats, each seat comprising a front portion pressing against an end of the spring and a back portion pressing against the first and / or second coaxial portions, the manufacturing method comprising the following steps:

[0097] - Provides a wear mount that displays wear marks.

[0098] - Install the wear seat on the spring.

[0099] - Insert the assembly, including the wear seat and the spring, into the recess of the first coaxial portion and the recess of the second coaxial portion.

[0100] The wear seat may have one or more of the features described above.

[0101] The method may include one or more of the following features:

[0102] Each wear seat can be installed in both a second and a first orientation.

[0103] During previous use, the wear seat was installed in a first orientation. The step of inserting the assembly including the wear seat and the spring is to install the wear seat in a second orientation in the recess of the first and second coaxial portions.

[0104] Each wear seat includes a back surface and at least one bearing protrusion protruding from the back surface and adapted to press against a first coaxial portion and / or a second coaxial portion. The bearing protrusion includes:

[0105] - Peak,

[0106] -The first wall showing signs of wear

[0107] -The peak connects to the second wall of the first wall.

[0108] The step of inserting the assembly including the spring and the bearing seat is such that when the wear seat is viewed in a plane perpendicular to the axis of rotation (X), the first wall is located radially inside the second wall in the torsional damping device.

[0109] The advantage is that the second wall showed no signs of wear.

[0110] The wear seat includes a first axial clamping device and a second axial clamping device adapted to interact with first and second coaxial portions of a torsional damping device. The first and second axial clamping devices are located on either side of a pivot lug of the wear seat. The wear seat has previously been used in a first orientation with the first axial clamping device located radially outside the pivot lug. The wear seat is adapted to be used in a second orientation with the second axial clamping device located radially outside the pivot lug.

[0111] Where appropriate, at least one bearing protrusion is formed, in part or in whole, by a pivot lug.

[0112] The wear seat includes a mounting error prevention device. During the step of inserting the assembly including the wear seat and the spring into the first and second coaxial portions, the assembly including the wear seat and the spring passes through the mounting template before being introduced into the recesses of the first and second coaxial portions. The mounting template includes a complementary error prevention device arranged such that the mounting template only allows the wear seat to pass through in the second orientation.

[0113] The anti-misalignment device for the wear seat is formed on one of the first axial clamping device and the second axial clamping device.

[0114] Advantageously, prior to the step of providing the wear seat exhibiting wear marks, the manufacturing method includes the following steps:

[0115] -Remove the worn damper.

[0116] - A holder for storing wear dampers.

[0117] According to one variation, one of the first and second coaxial portions includes two lateral washers rigidly connected to each other for co-rotation about a rotation axis (X), and the other of the first and second coaxial portions includes an intermediate washer. The two lateral washers and the intermediate washer originate from a worn damper. In other words, this could be a method for repairing a worn damper.

[0118] The present invention also relates to the use of a wear seat for manufacturing a torsional damping device.

[0119] The wear seat and torsional damping device may include one or more of the features described above.

[0120] Specifically, the wear seat was previously used in the first orientation, and the wear seat is used in the second orientation in the torsional damping device. Attached Figure Description

[0121] The invention can be better understood by reading the following description and referring to the accompanying drawings. The drawings are given only as a completely non-limiting illustration of the invention.

[0122] Figure 1 This illustrates a prior art torsional damping device;

[0123] Figure 2 This illustrates another torsional damping device in the prior art, comprising a spring and two seats;

[0124] Figure 3 It shows Figure 2 Front view of the wear seat;

[0125] Figure 4 It shows Figure 2 Side view of the wear seat;

[0126] Figure 5 The seat offset is shown when subjected to centrifugal force or transmitted torque;

[0127] Figure 6 A front view of the wear seat in the first embodiment of the present invention is shown;

[0128] Figure 7 It shows Figure 6 Side view of the wear seat in a plane perpendicular to the damper's rotation axis;

[0129] Figure 8 Showing around Figure 6 The principle of rotation of the wear seat;

[0130] Figure 9 An assembly comprising a spring and two seats is shown in a second embodiment of the invention;

[0131] Figure 10 It shows Figure 9 Side view of the wear seat in a plane perpendicular to the damper's rotation axis.

[0132] Figure 11 It shows Figure 10 Front view of the wear seat;

[0133] Figure 12 A first template for installing an assembly including a spring and two new seats is shown;

[0134] Figure 13 The steps for inserting the assembly, which includes a spring and a seat, are shown.

[0135] Figure 14A second template for mounting an assembly including a spring and two wear seats is shown in order to manufacture a torsional damping device according to a second embodiment;

[0136] Figure 15 , Figure 16 and Figure 17 Different embodiments are shown. Detailed Implementation

[0137] In the specification and claims, the terms "outer" and "inner," and the orientations "axial" and "radial," will be used to denote elements of a torsional damping device as defined in the specification. The axis of rotation X of the damping device determines the "axial" orientation. Thus, axial rotation is rotation about the axis X, and the axial clamping of the element restricts or even prevents translation of the element parallel to the axis X. The "radial" orientation is orthogonal to the axis X. The circumferential orientation is orthogonal to the axis of rotation X and orthogonal to the radial direction. In the radial direction, the terms "outer" and "inner" are used to define the relative position of one component with respect to another component along the reference axis of rotation X; thus, components closer to said axis are described as inner components, as opposed to outer components that are radially peripheral.

[0138] Figure 1 An example of a known torsional damping device 1 disclosed in patent application FR3079580 is shown. In this case, the damping device 1 is associated with a friction disc 2 and a center hub 3 to form a clutch disc 1 suitable for placement between the engine and transmission of a vehicle. The friction disc 2 includes circular friction linings. The friction linings are adapted to be selectively pressed against a flywheel fixed to the vehicle engine by a clutch mechanism to transmit torque between the engine and the friction disc. The center hub 3 is adapted to be coupled so that it is constrained to rotate with the input shaft of the vehicle transmission via its internal splines. Thus, torque can be transmitted between the friction disc 2 and the center hub 3 via the torsional damping device 1, and vice versa.

[0139] The torsional damping device 1 allows relative rotational movement between the central hub 3 and the friction disc 2 about axis X, in order to dampen torsional vibrations during torque transmission. In this example, the torsional damping device includes five springs 4 circumferentially positioned around the central hub 3. The torsional damping device is capable of compressing the springs 4 between the first coaxial portion 5 and the second coaxial portion 6 to provide damping. In this example, the second coaxial portion 6 includes a pair of lateral washers 60, also referred to as guide washers 60, which are rigidly connected to each other for common rotation. The first coaxial portion 5 includes an intermediate washer 50, hereinafter referred to as a flange 50, which is axially positioned between the two guide washers 60. In this example, the friction disc 2 is fixed to the flange 50, for example, by riveting, and both guide washers 60 are fixed to the central hub 3 by riveting on both sides of the flange 50. The guide washers 60 and the flange 50 thus constitute an axial stack of three discs, with the possibility of relative rotation between the flange 50 and the guide washers 60, which also corresponds to the possible rotation between the friction disc 2 and the central hub 3 in the absence of a pre-damper.

[0140] For each spring 4, the flange 50 includes an opening 7, and each guide washer 60 includes an opening 8. The corresponding spring 4 is mounted in the openings 7 and 8 such that its ends interact with an edge of the opening 7 and an edge of each opening 8, respectively. The ends of the spring 4 interact with the openings 7 and 8 via two seats 9, each seat 9 located at one end of the spring 4. Thus, each seat 9 presses against an edge of the opening 7 and an edge of each opening 8.

[0141] The pivot lug 10 is used to allow the seat 9 to pivot relative to the flange 50 and relative to the guide washer 60.

[0142] On the horizontal plane of each spring 4, during relative axial rotational movement between the flange 50 and the two guide washers 60, one of the seats 9 is compressed only by the flange 50 and moves away from the edge of the opening 8 of the guide washer 60, while the other seat 9 at the other end of the spring 4 presses only against the guide washer 60, with the edge of the opening 7 of the flange 50 moving away. Therefore, during the relative movement between the flange 50 and the guide washers 60, the spring 4 is compressed to perform a torsional damping function. The interaction between the end of the spring 4 and the flange 50 and guide washers 60 is optimized and made more reliable by the seat 9, which holds the spring 4 in place and provides an interface that prevents excessive damage to the end of the spring 4 when it contacts the flange 50 and guide washers 60.

[0143] Because the pivot lug 10 allows compression of the spring 4 without generating false force, the seat 9 also provides satisfactory guidance for the spring 4. Due to the pivot lug 10, the ends of the spring 4 remain substantially parallel to each other during its compression.

[0144] Figures 2 to 5Another known seat 9 in the prior art is shown, which also has a pivot lug 10. The pivot lug 10 of the seat is in the form of a crossbar extending substantially along the diameter of the seat 9. The seat shown is worn. It shows wear marks 101.

[0145] The pivot lug 10 presses together on three pivot recesses: the pivot recess 53 of the central flange 50 and the two pivot recesses 63 of the guide washers 60 on either side of it along its axial direction. The housing formed by the three pivot recesses 53, 63 thus receives the pivot lug 10, allowing it to pivot about its axial extension, i.e., an axis parallel to the axis of rotation X.

[0146] Pivot notches 53 are provided on the corresponding edge of opening 7, and each pivot notch 63 is provided on the corresponding edge of opening 8.

[0147] These seats 9 also include axial clamping devices, as described below, including clamping walls that maintain the axial relative positions between the seat 9 and the flange 50, and between the seat 9 and the guide washer 60.

[0148] Each seat includes a first clamping device 120 and a second clamping device 130. Each clamping device includes a first rib 121, 131 and a second rib 122, 132, with the edge surface of the flange 50 inserted therebetween.

[0149] For each axial clamping device, the first ribs 121 and 131 include outer walls 126 and 136 and inner walls 123 and 133. One of the two lateral washers 60 can be axially pressed against the outer wall 126 and 136, and the flange 50 can be axially pressed against the inner wall 123 and 133. Similarly, for each axial clamping device 120 and 130, the second ribs 122 and 132 include outer walls 128 and 138 and inner walls 125 and 135. The other of the two lateral washers 60 can be axially pressed against the outer wall 128 and 138, and the flange 50 can be axially pressed against the inner wall 125 and 135.

[0150] In other words, for each axial clamping device, the edge faces of the two lateral washers 60 are axially located on both sides of the two ribs 121, 122, 131, 132, and the edge face of the flange 50 is axially located between the two ribs.

[0151] When viewed in a plane perpendicular to the axis of rotation (X), the pivot lug 10 includes:

[0152] -Peak S,

[0153] -Inner wall;

[0154] - The outer wall, which is connected to the first wall via the peak S and is located radially outside the inner wall.

[0155] When a damper is installed and the damper wears, the seat exhibits wear marks 101, partially or entirely on the outer wall, due to centrifugal force and the approach force of one of the coaxial parts on the seat, as described above.

[0156] In particular, the outer wall can interact with the load-bearing portion formed on the first or second coaxial portion, thereby radially retaining the wear seat when subjected to centrifugal force. Figure 5 ).

[0157] Due to centrifugal force E and torque transmission force, wear marks 101 appear on the outer wall of the pivot lug in the area where it presses against the flange 50 and the lateral washer 60. In other words, when they are worn, Figures 2 to 5 The seat in the middle shows wear marks 101 concentrated on the outer wall of the pivot lug 10.

[0158] It is impossible to rotate the existing seat so that the second and first walls of the pivot lug are reversed because the seat has a radially recessed portion on its outer contour into which a portion of the lateral washer can enter. If this type of seat is installed "from back to front", there will be undesirable interference between the lateral washer 60 of the damping device and the seat 9 in the radial interior of the seat 9.

[0159] Figures 6 to 9 A base for a first embodiment of a torsional damping device is shown. The first embodiment of the torsional damping device has a... Figure 1 The coaxial parts 5 and 6 and the spring 4 are of the same type as those shown. Identical elements or components that perform the same function as the aforementioned elements have the same reference numerals.

[0160] According to the first embodiment, the torsional damping device includes a seat 9 that can be mounted along a first orientation O1 and a second orientation O2. The seat 9 is a wear seat mounted along the second orientation O2 and has wear marks 101 caused by use along the first orientation O1.

[0161] "Wear marks" refer to wear marks that are visible to the naked eye.

[0162] Seat 9 can initially be used in two different positions, and can be reused in one of the positions to extend its service life. Figure 6 and 7 The seat shown is suitable for this type of reuse.

[0163] The seat 9 includes a front portion 9F that presses against the spring end 4 and a back portion 9D that presses against the first coaxial portion 5 and / or the second coaxial portion 6.

[0164] The front part 9F includes a front end for pressing against the spring end 4. The front end of the wear seat 9 is arranged perpendicular to the spring axis Y.

[0165] Each wear seat 9 has a back 9D including a back 92 and at least one pivot lug 10, which protrudes from the back 92 and is used to press against the first coaxial portion 5 and / or the second coaxial portion 6.

[0166] exist Figure 6 and Figure 7 In the middle, the wear marks are located on the first wall 12. In this case, when the seat is installed in the damper, it is located at the peak, that is, radially outward, because Figure 6 and Figure 7 The wear seat in the first orientation is shown.

[0167] After the step of disassembling the worn damping device, wherein the seat is in the first orientation, the seat is reused in a torsional damper according to a first embodiment of the invention, such that the wear mark 101 is partially or entirely located on the radially inner wall 12 (first wall 12). The second wall 11, which will bear the greatest stress during the "second use" of the seat, is therefore in very good condition. Then the wear mark 101 located on the first wall 12 of the pivot lug has no effect on the effectiveness of the torsional damping device. Figure 8 The diagram schematically illustrates the transition of the wear seat from its first orientation O1 to its second orientation O2. The second orientation O2 of the wear seat 9 in the torsional damping device 1 corresponds to a 180-degree rotation of the wear seat relative to its first orientation O1 in the wear damping device. The spring associated with the wear seat extends about axis Y, and the wear seat rotates between its first and second orientations about axis Y' of the seat, which is substantially aligned with the axis Y of the spring with which it must interact. In other words, the wear seat 9 is reused repeatedly.

[0168] refer to Figure 8 The right side portion shows the wear seat in the second orientation O2 in a plane perpendicular to the rotation axis X, where the pivot lug 10 can be seen to include:

[0169] -Peak S,

[0170] -First Wall 12,

[0171] - The second wall 11 is connected to the first wall by means of the peak S and is located radially outside the first wall 12.

[0172] In this case, the wear marks are entirely located on the first wall 12.

[0173] The second wall 11 can interact with the bearing portion 51 formed on the first coaxial portion 5 and / or the complementary second bearing portion formed on the second coaxial portion 6, so that the wear seat 9 is radially held when subjected to centrifugal force.

[0174] When seat 9 is installed within the torsional damping device, pivot lug 10 extends in a direction parallel to the rotation axis X. The peak S of seat 9 is a crown that extends axially and separates the first wall and the second wall. The first wall 12 and the second wall 11 also extend in a direction parallel to the rotation axis X.

[0175] Within the scope of this invention, it is understood that the second wall 11 is located radially outward of the first wall 12 relative to the axis of rotation X of the torsional damper and in the second orientation O2. When the seat 9 is installed in the torsional damping device, particularly according to the first embodiment, its second wall 11 faces radially outward, such that it is radially held by the bearing portion formed on the first coaxial portion 5 and / or the complementary second bearing portion formed on the second coaxial portion 6.

[0176] In this case, such as from Figure 8 As can be seen from the right side, when the second wall 11 is in the second orientation for reuse, the wear marks 101 of each wear seat 9 are located entirely outside the second wall 11.

[0177] Figure 8 In this case, the wear mark 101 of the intermediate wear seat is located entirely on the first wall 12.

[0178] Figure 8 The X-axis is shown to distinguish the two orientations O1 and O2. Its distance from seat 9 has, of course, been shortened.

[0179] The wear seat 9 includes a first axial clamping device 120 and a second axial clamping device 130. The first axial clamping device 120 includes a wall that axially clamps the wear seat relative to the first coaxial portion 5 and the second coaxial portion 6. The second axial clamping device 130 includes a wall that axially clamps the wear seat relative to the first coaxial portion 5 and the second coaxial portion 6.

[0180] The first axial clamping device 120 and the second axial clamping device 130 are arranged on both sides of the pivot lug 10.

[0181] The axial clamping wall of the first axial clamping device 120 and the axial clamping wall of the second axial clamping device 130 are arranged in the same plane.

[0182] The wear seat 9 was previously used with a second axial clamping device 130 located radially inside the pivot lug, and the wear seat 9 is used together with a first axial clamping device 120 located radially inside the pivot lug 10 in a torsional damping device.

[0183] Both the first clamping device 120 and the second clamping device 130 include first ribs 121 and 131 and second ribs 122 and 132, with the edge surface of the flange 50 inserted therebetween. For each axial clamping device 120 and 130, the first ribs 121 and 131 include an outer wall 126 or 136 that can be axially pressed against one of the two lateral washers 60 and a first inner wall 123 or 133 that can be axially pressed against the flange 50. For each axial clamping device, the second ribs 122 and 132 include a second outer wall 128 or 138 that can be axially pressed against the other of the two lateral washers 60 and a first inner wall 133 or 135 that can be axially pressed against the flange 50. In other words, for each axial clamping device 120 and 130, the edge surfaces of the two lateral washers 60 are axially positioned on both sides of the two ribs 121, 122, 131, and 132, and the edge surface of the flange 50 is axially positioned between the two ribs.

[0184] The first axial clamping device 120 and the second axial clamping device 130 are symmetrical about the rotation axis Y of the wear seat, and are used to switch the wear seat from the first orientation O1 to the second orientation O2. Therefore, the axial clamping on the first orientation O1 and the second orientation O2 of the seat 9 is exactly the same.

[0185] The profile of the wear seat 9 has an axis of symmetry. Therefore, the axis of rotation Y' of the seat is an axis of symmetry. Figure 3 and Figure 4 Unlike the known seats in the diagram, this seat can therefore be installed on two orientations, O1 and O2.

[0186] according to Figures 9 to 11 In the second embodiment shown, the torsional damping device includes a wear seat 9, which is provided with an anti-misalignment device 98 adapted to prevent the wear seat 9 from being installed in the torsional damping device in the first orientation O1.

[0187] Figures 9 to 11 The wear seat in the first orientation O1 is shown.

[0188] like Figure 11 As can be seen, the symmetry of the wear seat is only broken by the installation of the error prevention device 98 and the wear mark 101.

[0189] In this case, the anti-misalignment device 98 of the wear seat is formed on the ribs 121, 131 of the first axial clamping device 120. In this case, the anti-misalignment device takes the form of a cavity 98.

[0190] According to a variant not shown, the wear marks are not concentrated on the pivot lug, but on another type of bearing lug.

[0191] The present invention also relates to a method of manufacturing a torsional damper comprising a first coaxial portion and a second coaxial portion rotatably mounted relative to each other about a rotation axis X; springs received in recesses in the first and second coaxial portions and acting circumferentially between the first and second coaxial portions such that they elastically resist relative rotation of the first and second coaxial portions about the rotation axis X; and a plurality of seats, each seat comprising a front portion pressing against an end of a spring and a back portion pressing against the first and / or second coaxial portion. The manufacturing method comprises the following steps:

[0192] - Provides a wear seat 9, which exhibits wear marks and originates from a wear damping device.

[0193] - Install the wear seat 9 onto the spring 4 of the torsional damping device.

[0194] - The assembly including the wear seat 9 and the spring 4 is arranged in the recess of the first and second coaxial portions.

[0195] Preferably, each wear seat 9 can be mounted in a first orientation O1 and a second orientation O2. The wear seat is mounted in the wear damping device in the first orientation, and the step of arranging the assembly including the wear seat and the spring causes the wear seat to be mounted in the recess of the first and second coaxial portions in the second orientation.

[0196] Each wear seat's back 9D includes a back surface and at least one pivot lug 10, which protrudes from the back surface 92 and is arranged to press against a first coaxial portion 5 and / or a second coaxial portion 6. The assembly including the wear seat and spring 4 is positioned such that, when viewed in a plane perpendicular to axis X, at least one pivot lug 10 includes:

[0197] -Peak S,

[0198] - The second wall 11 is radially arranged outside the peak S.

[0199] - A first wall 12, which is radially disposed inside the peak S and connected to the second wall via the peak S.

[0200] The wear mark 101 is substantially or even entirely located on the first wall 12 of at least one pivot lug 10.

[0201] The wear seat 9 includes a first axial clamping device 120 and a second axial clamping device 130, which are adapted to interact with the first and second coaxial portions 5 and 6 of the torsional damping device 1. The first axial clamping device 120 and the second axial clamping device 130 are located on both sides of the pivot lug 10 of the wear seat 9. The wear seat 9 has been previously used in a first orientation O1 with the first axial clamping device 130 located radially inside the pivot lug 10. The wear seat 9 is adapted in a second orientation O2 in the torsional damping device to be used with the first axial clamping device 120 located radially inside the pivot lug 10.

[0202] exist Figures 9 to 14 In the illustrated embodiment, the wear seat 9 includes a mounting error prevention device 98, and an assembly including the wear seat and a spring passes through a mounting template before being introduced into the recesses of the first and second coaxial portions 5 and 6. The mounting template includes a complementary error prevention device that interacts with the mounting error prevention device 98.

[0203] Two installation templates are available. Figure 12 and 14 The orientation of the seat is shown in parentheses.

[0204] The first installation template 201 can be used with the new seat 9, which is equipped with a fault-proofing device 98.

[0205] The complementary error-proofing device 198 of the first mounting template 201 is arranged such that the first mounting template 201 only allows the new seat 9 to pass through in the first orientation O1.

[0206] After the worn damping devices have been removed from the worn devices, the worn seats can be reinstalled onto the torsional damping devices using the second mounting template 202.

[0207] The complementary error-proofing device 298 of the second mounting template 202 is arranged such that the second mounting template 202 only allows the wear seat 9 to pass through the second orientation O2. In this case, the complementary error-proofing device 298 of the second mounting template 202 is located in the radially inner region of the opening through which the spring passes, while the complementary error-proofing device 198 of the first mounting template 201 is located in the radially outer region of the opening through which the spring passes. Therefore, the seat cannot be reinstalled in the "wear" position O1.

[0208] In this configuration, the error-proofing device is formed by two cavities 98 within the base 9, and more specifically, within the axial clamping ribs 121 and 122. The complementary error-proofing devices 198 and 298 of the first and second mounting templates are protrusions 198 and 298. During the mounting of the assembly including the base 9 and the spring 4 within the first and second coaxial portions, the cavities 98 slide around the protrusions 198 and 298.

[0209] In one variation, a cavity is formed on the mounting template, and a protrusion is formed on the seat.

[0210] This manufacturing method can be implemented under two different conditions.

[0211] In the first case, the damping device is made of wear seat 9. In this case, the wear seat 9 comes from different worn dampers that have been disassembled and whose wear seats have been retained and stored for reuse.

[0212] In the second embodiment, the worn dampers are repaired, and their worn seats 9 are reinstalled from back to front. The lateral washers 60 and intermediate washers 50 of such dampers can, for example, remain unchanged.

[0213] Understandably, during the second life cycle of the wear seat, new wear marks will appear on the second wall 11 (the second orientation of the seat), which was not present in the previous life cycle. Figure 8 The right side is shown.

[0214] Another variation of the seat, such as Figure 15 and 16 As shown. The peak S includes a dividing groove (recess) 160 that separates the first wall 12 from the second wall 11.

[0215] The seat pivots about an axis parallel to the rotation axis X of the damping device, and the bearing protrusion 10 is a pivot lug.

[0216] As from Figure 17 As can be seen, the seat is pivotable and the pivot offset of the seat is advantageous. The back 92 of the back 9D is arranged on the plane P, and the supporting protrusion is a rod portion with a generally circular cross-section having a center C on one surface. The rod portion forms an element of the pivot connection, and the axis of the rod portion passes through the center C of the rod portion and extends from the plane P by a predetermined distance d that is not equal to zero. Preferably, for the radius r of the generally circular cross-section of the rod portion, d > r / 3, preferably d > r / 2, especially d > 2r / 3, especially d > r.

[0217] According to other variant embodiments, the friction disc may be mounted on a lateral washer, and the central drive hub of the gearbox input shaft may be connected to a flange.

[0218] In the case of a dual-mass flywheel, the second coaxial portion can be formed by the main flywheel, which may optionally be provided with a cover, and the first coaxial portion can be formed by a flange connected to the auxiliary flywheel.

Claims

1. A seat (9) for a torsional damping device, comprising, on one hand, a front portion (9F) for pressing against one end of a spring (4), and on the other hand, a back portion (9D) for pressing against a first coaxial portion (5) and / or a second coaxial portion (6) of the torsional damping device, characterized in that, The seat (9) can be installed in the torsional damping device in a first orientation (O1) and a second orientation (O2). The back (9D) includes a back surface (92) and at least one bearing protrusion (10), which protrudes from the back surface (92) and is arranged to press against a first coaxial portion (5) and / or a second coaxial portion (6). When viewed in a plane perpendicular to the axis of rotation (X) of the torsional damping device, the at least one bearing protrusion (10) includes: - Peak (S) - First wall (12), - Second wall (11), which is connected to the first wall by means of a peak (S) and is located radially outside the first wall (12); The first wall (12) and the second wall (11) are arranged on both sides of an axis perpendicular to the back and passing through the peak (S). The peak (S) includes a boundary (160) that separates the first wall (12) from the second wall (11).

2. The seat according to claim 1, wherein the supporting protrusion (10) extends in a direction parallel to the axis of rotation (X).

3. The seat according to claim 2, wherein the boundary (160) is a groove.

4. The seat according to any one of claims 1 to 3, wherein the seat (9) is a seat that pivots about an axis parallel to the rotation axis (X) of the torsional damping device, and at least one bearing lug (10) is a pivot lug.

5. The seat according to claim 4, wherein the back (9D) is disposed in the plane P, and the bearing protrusion is a rod portion having a generally circular cross-section with a center (C) on one surface, the rod portion forming a pivotally connected element, the axis of the rod portion passing through the center (C) of the rod portion and extending from the plane P by a predetermined distance (d) not equal to zero.

6. The seat according to claim 5, wherein for the radius (r) of the fundamental circular cross-section of the rod portion, d > r / 3.

7. The seat according to any one of claims 1 to 3, wherein the seat (9) is a seat pivoting about an axis parallel to the rotation axis (X) of the torsional damping device, and at least one bearing lug (10) is a pivot lug, and the seat includes a first axial clamping device (120) and a second axial clamping device (130), the first axial clamping device including walls (123, 125, 126, 128) for axially clamping the seat relative to the first coaxial portion (5) and the second coaxial portion (6), the second axial clamping device also including walls (133, 135, 136, 138) for axially clamping the seat relative to the first coaxial portion (5) and the second coaxial portion (6), the first axial clamping device (120) and the second axial clamping device (130) being arranged on both sides of the pivot lug (10), the axial clamping wall of the first axial clamping device being arranged in the same plane as the axial clamping wall of the second axial clamping device.

8. The seat according to any one of claims 1 to 3, wherein the seat includes a mis-proofing device (98).

9. The seat according to any one of claims 1 to 3, wherein the second orientation of the seat corresponds to a 180-degree rotation of the seat relative to the first orientation.

10. The seat according to claim 6, wherein, d>r / 2。 11. The seat according to claim 6, wherein, d>2r / 3。 12. The seat according to claim 6, wherein, d>r。 13. A torsional damping device (1), comprising: - A first coaxial portion (5) and a second coaxial portion (6) are rotatably mounted relative to each other around a rotation axis (X). - A spring (4) that acts circumferentially between the first coaxial portion (5) and the second coaxial portion (6) such that they elastically resist relative rotation of the first coaxial portion (5) and the second coaxial portion (6) about the axis of rotation (X). - Multiple seats (9), each seat (9) including, on one hand, a front portion (9F) that presses against the end of the spring (4), and on the other hand, a back portion (9D) that presses against the first coaxial portion (5) and / or the second coaxial portion (6). Its features are, At least one seat (9) is a seat according to any one of claims 1 to 12.

14. The torsional damping device according to claim 13, wherein at least one seat is a worn seat exhibiting wear marks (101) caused by previous use in the first orientation (O1).

15. The torsional damping device according to claim 13, wherein the wear marks are partially or entirely located on the first wall (12).

16. The torsional damping device according to claim 14 or 15, wherein the wear marks (101) of each wear seat (9) are located partially or entirely on the outside of the second wall (11).

17. A method for manufacturing a torsional damping device (1), the torsional damping device comprising a first coaxial portion (5) and a second coaxial portion (6) rotatably mounted relative to each other about a rotation axis (X); a spring (4) received in a recess in the first coaxial portion (5) and the second coaxial portion (6) and acting circumferentially between the first coaxial portion (5) and the second coaxial portion (6) such that they elastically resist relative rotation of the first coaxial portion (5) and the second coaxial portion (6) about the rotation axis (X); a plurality of seats (9), each seat comprising, on one hand, a front portion (9F) pressing against an end of the spring (4), and on the other hand, a back portion (9D) pressing against the first coaxial portion (5) and / or the second coaxial portion (6), the manufacturing method comprising the steps of: - Provides a wear mount (9) that displays wear marks. - Install the wear seat (9) onto the spring (4), - Insert the assembly, including the wear seat (9) and the spring (4), into the recess of the first coaxial portion (5) and the recess of the second coaxial portion (6). The back (9D) includes a back surface (92) and at least one bearing protrusion (10), which protrudes from the back surface (92) and is arranged to press against a first coaxial portion (5) and / or a second coaxial portion (6). When viewed in a plane perpendicular to the axis of rotation (X) of the torsional damping device, the at least one bearing protrusion (10) includes: - Peak (S) - First wall (12), - Second wall (11), which is connected to the first wall by means of a peak (S) and is located radially outside the first wall (12); The first wall (12) and the second wall (11) are arranged on both sides of an axis perpendicular to the back and passing through the peak (S). The peak (S) includes a boundary (160) that separates the first wall (12) from the second wall (11).

18. The method for manufacturing a torsional damping device according to claim 17, wherein each wear seat (9) is capable of being mounted in a first orientation (O1) and a second orientation (O2), the wear seat (9) having been mounted in the first orientation (O1) in previous use, and the step of inserting the assembly comprising the wear seat (9) and the spring (4) is to mount the wear seat (9) in the second orientation (O2) in the recesses of the first coaxial portion (5) and the second coaxial portion (6).

19. The method for manufacturing a torsional damping device according to claim 17 or 18, wherein the wear seat includes a mounting anti-misalignment device (98), and during the step of inserting the assembly including the wear seat (9) and the spring (4) into the first coaxial portion (5) and the second coaxial portion (6), the assembly including the wear seat (9) and the spring (4) passes through a mounting template (202) before being introduced into the recesses of the first coaxial portion (5) and the second coaxial portion (6), the mounting template (202) including a complementary anti-misalignment device (298) arranged such that the mounting template only allows the wear seat (9) to pass in the second orientation (O2).

20. The method for manufacturing a torsional damping device according to claim 17 or 18, wherein the back (9D) of each wear seat (9) includes a back surface (92) and at least one bearing protrusion (10) protruding from the back surface (92) and adapted to press against a first coaxial portion (5) and / or a second coaxial portion (6), the bearing protrusion (10) comprising: - Peak (S) - The first wall (12) shows signs of wear (101). - The second wall (11), which is connected to the first wall (12) by means of a peak (S), The step of inserting the assembly including the spring (4) and the wear seat (9) is to position the first wall (12) radially inside the second wall (11) in the torsional damping device (1).

21. The method for manufacturing a torsional damping device according to claim 17 or 18, wherein prior to the step of providing the wear seat (9) exhibiting wear marks, the manufacturing method comprises the following steps: - Remove the worn torsional damping device. - A holder for storing worn torsional damping devices.

22. The method for manufacturing a torsional damping device according to claim 21, wherein one of the first coaxial portion (5) and the second coaxial portion (6) includes two lateral washers (60) rigidly connected to each other for co-rotation about a rotation axis (X), and the other of the first coaxial portion (5) and the second coaxial portion (6) includes an intermediate washer (50), the two lateral washers (60) and the intermediate washer (50) being derived from a worn torsional damping device.

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