ARRANGEMENT WITH A RIVET

Description

[0001] The present invention relates to fastening elements and more specifically to rivets, to assemblies comprising such rivets and to a method of manufacturing such assemblies.

[0002] Rivets are commonly used as fasteners to join different parts together. Rivets are permanent assembly and fastening elements. They allow a user to easily secure disparate parts together.

[0003] Rivets are generally cylindrical rods, usually made of metal, and can be solid or hollow. One end of the rivet has a head, which is a larger cross-section. The other end is flattened and widened by crushing to join the parts to be riveted together. This is called riveting.

[0004] Document DE 10 2019 110 806 A1 discloses an assembly comprising a rivet according to the prior art.

[0005] The pieces that we wish to join together, for example two plates, have each been pre-drilled with a hole allowing the rivet shank to pass through both.

[0006] There are also rivets that come in the form of a cylindrical rod whose two ends are flattened and widened by crushing. This is double riveting.

[0007] Compared to single riveting, double riveting allows for optimized fixing on both ends of the rivet by minimizing play between the rivet and the parts joined together by said rivet.

[0008] Double riveting has the disadvantage of a longer installation time due to the deformation of both ends of the rivet shank, leading to an increased risk of error, misalignment, and / or deformation. Furthermore, the holes drilled in the parts to be joined, designed to accommodate the rivet, must have a specific (conical) shape, which is more complex and expensive to produce.

[0009] One aim of the invention is to provide a set of two elements including a rivet allowing optimal fixing of these two elements like double riveting without its disadvantages.

[0010] To this end, the invention proposes an assembly, in particular a pendulum body for a pendulum damping device intended to equip a vehicle transmission, prior to assembly, comprising: a first element having a first recess with a sixth diameter, a third element having a third recess with an eighth diameter, the eighth diameter being identical to the sixth diameter of the first recess of the first element, a rivet extending axially between a head and a foot and comprising a body situated axially between the head and the foot, said rivet body comprising a first portion, having a first diameter, and a second portion, having a second diameter less than the first diameter, and in which the first diameter of the first portion of the rivet body is equal to the sixth diameter of the first recess of the first element.

[0011] Thus, the dual diameter of the rivet body in the assembly according to the invention allows for both easy insertion of the rivet into the first and second recesses of the first and second elements of the assembly, respectively, via the side of the rivet body with the smaller diameter, i.e., the second diameter, and simultaneously, play-free or minimal-play insertion into the first recess of the first element, in order to optimize the connection between the rivet and the first element without subsequent deformation of the rivet, via the larger diameter, i.e., the first diameter. This dual function is achieved without any additional deformation of the rivet. The rivet assembly is thus optimized without increasing assembly time or placing additional stress on the elements to be assembled compared to a conventional rivet. The recesses of the two elements of the assembly are identical.

[0012] A rivet may also include one or more of the following optional features, or a rivet of the assembly according to the invention may also include one or more of the following optional features: The rivet is of the solid or semi-drill type; the foot is designed to be deformed; this facilitates riveting, particularly cold riveting; the head has a fourth diameter larger than the first diameter; this allows the head to control the rivet's positioning before riveting, thus facilitating its use; the first portion is axially in contact with the head and the second portion is axially in contact with the foot; this facilitates the insertion of the rivet into elements to be joined together; the first portion is axially in contact with the foot and the second portion is axially in contact with the head; this limits the separation of one or more elements already inserted onto the rivet even before the foot of said rivet is deformed; the body comprises two second portions, the first portion being located axially between the two second portions; this rivet shape can be adapted to certain environments; the first diameter is continuous;Thus, the rivet is simpler and less expensive to produce and facilitates assembly; the second diameter is continuous; the body further comprises an intermediate portion located axially between the first and second portions, the intermediate portion having a third diameter between the second and first diameters; the third diameter is smaller than the first diameter and larger than the second diameter; the intermediate portion facilitates insertion, for example by fitting, of the first portion into a recess; the third diameter is decreasing; thus, the transition between the first and second diameters is smoothed, which facilitates insertion of the first portion; the foot has a fifth diameter less than or equal to the second diameter; the foot facilitates insertion of the rivet into recesses;The first portion of the body includes a groove; the presence of one or more grooves on the first portion of the body allows for localized deformations of said first portion at the edges of the groove(s); these localized deformations allow for a local increase in the diameter of the first portion in order to reduce the clearance between a recess into which the rivet is inserted without increasing the forces required for said insertion into the recess; thus, the groove(s) allow for localized deformation during rivet assembly in order to facilitate it; the groove extends axially; the rivet assembly is optimized;

[0013] The assembly according to the invention may further include one or more of the following optional features:

[0014] The rivet and the first component form a unit that can be pre-assembled. The rivet is rigidly attached to the first component without deformation. Creating this unit upstream reduces the number of steps on a more complex assembly line. The first recess has a cylindrical shape; thus, the first recess is simple and quick to machine; the first element is a first mass of the pendulum body; the first diameter of the first portion of the rivet body is equal to the sixth diameter of the first recess of the first element to + / -0.05 millimeters (mm); the assembly further comprises a second element having a second recess with a seventh diameter, the second diameter of the second portion of the rivet body being less than said seventh diameter; insertion of the rivet into the second recess made in the second element is facilitated; the second recess has a cylindrical shape; thus, the second recess is simple and quick to machine; the second diameter of the second portion of the rivet body is less than the seventh diameter of the second recess to + / -0.2 millimeters (mm); the second element is a connecting member of the pendulum body;The rivet is adapted to match the first element to the second element; the assembly further comprises a third element having a third recess with an eighth diameter, the eighth diameter being identical to the sixth diameter of the first recess of the first element; thus, the insertion of the rivet into the third recess in the third element is facilitated, and the recesses of the first and third elements are made simultaneously in order to reduce manufacturing costs; the first element is identical to the third element; thus, said elements are interchangeable, which reduces the cost, limits the number of references required, and reduces errors during assembly; the third recess has a cylindrical shape; thus, the third recess is simple and quick to machine; the third element is a second mass of the pendulum body;The rivet is designed to match the first element, and optionally the second element, to the third element;

[0015] Alternatively, the invention relates to a method for manufacturing an assembly according to the invention comprising the following steps: Bring a first element having a first recess with a sixth diameter, Bring a rivet extending axially between a head and a foot and comprising a body situated axially between the head and the foot, said body comprising a first portion having a first diameter, the first diameter being equal to said sixth diameter, and a second portion having a second diameter less than the first diameter, Match the first element to the rivet by inserting the first portion of the body of said rivet into the first recess of said first element, Bring a third element having a third recess with an eighth diameter identical to the sixth diameter of the first recess of the first element, Insert the second portion of the body of the rivet into the third recess, Deform the foot of the rivet to match the first element to the third element so that the second portion of the body of the rivet deforms to fill the third recess.

[0016] A method according to the invention may further include one or more of the following optional steps: between the third and fourth steps preceding this invention, the steps consisting of: Bringing in a second element having a second recess with a seventh diameter less than the second diameter of the second portion of the rivet body, Inserting the second portion of the rivet body into the second recess, The last step of deforming the rivet foot consisting of deforming the rivet foot to match the first element with the second element and the third element so that the second portion of the rivet body deforms to fill the second and third recesses; in which the first element is a first oscillating mass and the third element is a second oscillating mass of a pendulum body of a pendulum damping device, in particular intended to equip a transmission of a vehicle; the second element is a linking member belonging to the pendulum body adapted to match the first oscillating mass with the second oscillating mass.

[0017] Other features and advantages of the invention will become apparent upon reading the following description and examining the attached drawing, in which: there figure 1 represents a rivet seen from the side; the figure 2 is a perspective of the rivet including grooves figure 3 is a schematic view of a double rivet, the figure 4 is a schematic view of the rivet according to a first alternative, the figure 5 is a schematic view of the rivet according to a second alternative, the figure 6 is a partial cross-sectional view of a double-mass flywheel including a rivet, the figure 7 is a perspective view of a pendulum damping device including rivets; the figure 8 a perspective view of a subassembly adapted to form a pendulum body, illustrating the assembly stage of the first oscillating mass at the rivets; the figure 9 is a side cross-sectional view along the VV axis shown on the figure 8 ; there figure 10 and the figure 11 are partial front views of the pendulum damping device of the figure 7 illustrating assembly steps for said pendulum damping device; the figure 12 is a side cross-sectional view along axis VIII-VIII shown on the figure 7 , without the bearing component;

[0018] In the different figures, identical references are used to designate identical or analogous organs.

[0019] Definitions: Unless otherwise specified, "axially" means "parallel to the longitudinal axis U of the rivet"; "radially" means "along a transverse axis intersecting the X axis of rotation of the support"; "angularly" or "circumferentially" means "around the axis of rotation of the support".

[0020] The thickness is measured along the X axis of rotation.

[0021] By "centrifugal support" we mean a support force having a component oriented away from the axis of rotation X

[0022] By "vehicle" we mean motor vehicles, which include not only passenger vehicles but also industrial vehicles, which notably includes heavy goods vehicles, public transport vehicles or agricultural vehicles, but also any transport device enabling the movement of a living being and / or an object from one point to another.

[0023] A "pendulum body" is defined as a mass mounted to oscillate on a support in response to the irregularities of the vehicle's engine. A pendulum body typically consists of a pair of oscillating masses, or "pendulum weights," extending to sandwich the support and rigidly connected to each other. A pendulum body also includes at least one connecting element, also called a strut, adapted to pair the oscillating masses. A pendulum body can also consist of a single oscillating mass. This single oscillating mass can be sandwiched between two supports.

[0024] Two parts are said to be "rigidly joined" or "paired" when they are permanently immobilized relative to each other. This immobilization can result from the first part being fixed directly to the second part, or via one or more intermediate parts.

[0025] The rest position of the device is that in which the pendulum bodies are subjected to a centrifugal force, but not to torsional oscillations from the acyclic movements of the internal combustion engine.

[0026] Pendulum bodies are said to be "supported by centrifugal force" when the rotational speed of the support is sufficient to keep the pendulum bodies pressed radially outwards against the rolling elements, and through them against the support.

[0027] Unless otherwise indicated, the verbs "comporter", "présenter" or "comprendre" should be interpreted broadly, that is to say, not restrictively.

[0028] A value that is less than, or greater than, another value is a value that is strictly less than, or greater than, that other value.

[0029] A rivet 30, as shown on the figure 1 , is particularly suitable for joining elements together and ensuring optimal fixing between said elements.

[0030] The 30 rivet can be solid or semi-drill.

[0031] Rivet 30 can extend along a longitudinal axis U between a head 31 and a foot 32. Rivet 30 can extend fully between the head 31 and the foot 32.

[0032] Alternatively, rivet 30 may include a second foot 32 as seen on the figure 3 The rivet 30 can extend fully between the two feet 32. The head 31 can be located axially between the two feet 32. Thus, a single rivet 30 can rigidly join several sets of elements together.

[0033] The rivet 30 may further comprise a body 33 situated axially, i.e. in the longitudinal direction U, between the head 31 and the foot 32. The body 33 may be divided into at least two portions: a first portion 34 and a second portion 35.

[0034] The first portion 34 can be located axially, i.e., along the longitudinal direction U, in contact with the head 31. Alternatively, the first portion 34 can be located axially in contact with the foot 32, as for example visible on the figure 4 The first portion 34 may be cylindrical. The first portion 34 may have a first diameter D1. The first diameter D1 may be continuous throughout the first portion 34. The first portion 34 may have a first axial length L1.

[0035] Alternatively, body 33 can be divided into three portions; a single first portion 34 and two second portions 35, as seen on the figure 5 The first portion 34 can be located axially between the two second portions 35. The first second portion can be axially in contact with the head 31 and the second second portion can be axially in contact with the foot 32.

[0036] The first portion 34 may include at least one groove 37. The at least one groove 37 may extend along the longitudinal direction U. The at least one groove 37 may have an axial length less than the first axial length L1 of the first portion 34.

[0037] The formation of a groove 37 allows for localized deformations of the first portion 34 of the rivet body 33 at the edges of said groove 37. These localized deformations can form grooves extending along the edges of the groove 37. These grooves locally increase the diameter of the first portion 34. This local increase in diameter reduces, and preferably eliminates, the clearance between the recess into which the rivet 30 is inserted, while also limiting the forces required for insertion. The groove 37 can be machined. Machining the groove allows for a process that does not require high precision and is therefore inexpensive.

[0038] The entire first portion 34 is included in the first diameter D1. That is to say, when the rivet 30 includes a groove 37, the top of the ribs resulting from the making of this groove 37 is included in the first diameter D1.

[0039] Preferably, the first portion 34 may comprise a plurality of grooves 37. The grooves 37 may be equi-distributed over the outer surface of the first portion 34.

[0040] The second portion 35 may be located axially, i.e., along the longitudinal direction U, in contact with the foot 32. Alternatively, the second portion 35 may be located axially in contact with the head 31. The second portion 35 may be cylindrical. The second portion 35 has a second diameter D2. The second diameter D2 may be continuous along the entire length of the second portion 35. The second diameter D2 is smaller than the first diameter D1. The second portion 35 may have a second axial length L2. The first axial length L1 may be smaller than the second axial length L2. The first axial length L1 may be at least twice as short as the second axial length L2 and preferably at least three times shorter than the second axial length L2.

[0041] The second portion 35 may include one or a plurality of grooves 37.

[0042] The body 33 may further include an intermediate portion 36. The intermediate portion 36 may be located axially, i.e., in a direction parallel to the longitudinal axis U, between the first portion 34 and the second portion 35. The intermediate portion 36 may have a third diameter D3. The third diameter D3 is smaller than the first diameter D1. The third diameter D3 is larger than the second diameter D2. The intermediate portion 36 may have a third axial length L3. The third axial length L3 may be smaller than the first axial length L1 and the second axial length L2. The third axial length L3 may be at least three times smaller than the first axial length L1.

[0043] The intermediate portion 36 may be cylindrical. The third diameter D3 may be continuous throughout the entire intermediate portion 36. Alternatively, the intermediate portion 36 may be in the shape of a portion of a cone. The third diameter D3 may decrease throughout the entire intermediate portion 36.

[0044] The head 31 of the rivet 30 can be cylindrical. The head 31 can have a fourth diameter D4. The fourth diameter D4 can be larger than the first diameter D1.

[0045] Alternatively, the fourth diameter D4 of the head 31 can be equal to the first diameter D1, the head 31 can be confused with the first portion 34 of the body 33.

[0046] Alternatively, the fourth diameter D4 of the head 31 can be equal to the second diameter D2, the head 31 can be confused with the second portion 35 of the body 33.

[0047] The foot 32 may have a fifth diameter D5. The fifth diameter D5 may be less than or equal to the second diameter D2. The foot 32 of the rivet 30 may be cylindrical. The fifth diameter D5 may be continuous along the entire foot 32. Alternatively, the foot 32 may be shaped like a portion of a cone. The fifth diameter D5 may decrease along the entire foot 32.

[0048] Alternatively, the fifth diameter D5 of foot 32 can be equal to the first diameter D1, foot 32 can be confused with the first portion 34 of body 33.

[0049] Alternatively, the fifth diameter D5 of foot 32 can be equal to the second diameter D2, foot 32 can be confused with the second portion 35 of body 33.

[0050] Foot 32 can be adapted to be deformed in order to finalize the fixing of at least two elements of an assembly.

[0051] The rivet 30 described above is a rivet before assembly. That is to say, it has not yet undergone any deformation to perform its function as a fastener.

[0052] Rivet 30 can be adapted to join together elements belonging to an assembly. The assembly includes

[0053] at least two elements, a first element and a second element. The assembly may include at least one third element. The first, second, and third elements may be any components to be assembled together, such as plates. Rivet 30 itself may belong to this assembly.

[0054] Rivet 30 and the first element can form a sub-assembly 40.

[0055] The assembly may belong to a symmetrical shock absorber.

[0056] The assembly may belong to a dual-mass flywheel. As is known, the dual-mass flywheel 1 comprises a primary flywheel 3. The primary flywheel 3 includes a flange integral with a starter ring gear. The flange and the starter ring gear are joined to each other at their outer radial periphery so as to at least partially delimit an internal volume 5. Elastic return elements 9, for example curved ones such as helical coil springs, may be mounted within said internal volume 5.

[0057] The elastic return elements 9 extend circumferentially and bear, at one end, on the flange and / or the starter ring and, at the other end, on a web 4 which may belong to a secondary flywheel 6.

[0058] The elastic return elements 9 allow a limited amplitude rotational movement of the secondary flywheel 6 relative to the primary flywheel 3, around an axis of rotation. The first element, the second element, and the third element can be chosen respectively from the primary flywheel 3, the disc 4, and the secondary flywheel 6, as shown in the diagram. figure 6 .

[0059] The assembly, in the example described below, can be a pendulum body 13 of a pendulum damping device 10. The first element can be a first oscillating mass 14 belonging to said pendulum body 13. The second element can be a connecting member belonging to said pendulum body 13, and the third element can be a second oscillating mass 14 belonging to said pendulum body 13. The first portion 34 of the body 33 of the rivet 30 is axially in contact with the head 31, and the second portion 35 of the body 33 of the rivet 30 is axially in contact with the foot 32.

[0060] As depicted on the figure 7 , a pendulum damping device 10, particularly suitable for equipping a vehicle transmission system, can be integrated into a component of such a transmission system, this component being for example a double damper flywheel.

[0061] This component can be part of a vehicle's powertrain, which may include an internal combustion engine with a predetermined number of cylinders, for example three, four, or six cylinders.

[0062] The pendulum damping device 10 comprises at least one pendulum body 13 mounted on a support 12 that rotates about an axis X of rotation. The device 10 preferably comprises a plurality of pendulum bodies 13 mounted on the support 12. Each pendulum body 13 comprises at least one oscillating mass 14.

[0063] Preferably, each pendulum body 13 comprises a first and a second oscillating mass 14 matched by means of at least one connecting member commonly called a "spacer" 20. Each pendulum body 13 may comprise a single spacer. Alternatively, each pendulum body 13 comprises two spacers 20.

[0064] Each spacer 20 can be riveted by means of at least one rivet 30 to the oscillating masses 14 of the same pendulum body 13. Thus, the rivet 30 is suitable for pairing the spacer 20, the first oscillating mass 14 and the second oscillating mass 14 together.

[0065] Each spacer 20 may include a main body extending radially and circumferentially, and is generally arched in shape. The main body extends radially between a radially external upper face 21 and a radially internal lower face 22. The main body extends circumferentially between a first circumferential end and a second circumferential end.

[0066] The main body of the spacer 20 may include at least one second recess 202. The second recess 202 is adapted for the passage of the rivet 30. The second recess 202 may be cylindrical. The second recess 202 may be through. The second recess 202 may have a seventh diameter D7. The seventh diameter D7 may be continuous throughout the second recess 202. The seventh diameter D7 may be larger than the second diameter D2 of the second portion 35 of the rivet 30. The seventh diameter D7 may be larger than the second diameter D2 of the second portion 35 of the rivet 30 with a tolerance of 0.2 mm.

[0067] The main body of the spacer 20 may include a plurality of second recesses 202. Each of the second recesses 202 is adapted for the passage of a rivet 30. Preferably, the spacer 20 includes two second recesses 202 when the pendulum body 13 includes two spacers 20 and includes four second recesses 202 when the pendulum body 13 includes a single spacer.

[0068] Each of the first and second oscillating masses 14 comprises a main body that extends radially and circumferentially and is generally arched in shape. The oscillating masses 14 are located on either side of the support 12 and are axially opposite in a direction parallel to the X-axis of rotation of the support 12.

[0069] The main body of the first oscillating mass 14 may include at least one first recess 141. The first recess 141 is adapted for the passage of the rivet 30. The first recess 141 may be cylindrical. The first recess 141 may be through. The first recess 141 may have a sixth diameter D6. The sixth diameter D6 may be continuous over the entire length of the first recess 141. The sixth diameter D6 may be equal to the first diameter D1 of the first portion 34 of the rivet 30. The sixth diameter D6 est equal to the first diameter D1 of the first portion 34 of rivet 30 with a tolerance of 0.05 mm.

[0070] The main body of the first oscillating mass 14 can include a plurality of first recesses 141. Each of the first recesses 141 is adapted for the passage of a rivet 30. Preferably, the first oscillating mass 14 includes as many first recesses 141 as the pendulum body 13 includes rivets 30.

[0071] The main body of the second oscillating mass 14 may include at least one third recess 143. The third recess 143 is adapted for the passage of the rivet 30. The third recess 143 may be cylindrical. The third recess 143 may be through-hole. The third recess 143 may have an eighth diameter D8. The eighth diameter D8 may be continuous throughout the entire third recess 143. The eighth diameter D8 is identical to the sixth diameter D6 of the first oscillating mass 14. The eighth diameter D8 may be larger than the second diameter D2 of the second portion 35 of the rivet 30.

[0072] The main body of the second oscillating mass 14 may include a plurality of third recesses 143. Each of the third recesses 143 is adapted for the passage of a rivet 30. Preferably, the second oscillating mass 14 includes as many third recesses 143 as the pendulum body 13 includes rivets 30.

[0073] The seventh diameter D7 of the second recess 202 of the spacer 20 can be identical to the sixth diameter D6 of the first recess 141 of the first oscillating mass 14 and to the eighth diameter D8 of the third recess 143 of the second oscillating mass. Thus, the same tooling can be used to make the first, second, and third recesses.

[0074] The support 12 can be an input element of the torsional damper, an output element or an intermediate phasing element disposed between two sets of springs of the damper, or an element rotationally linked to one of the aforementioned elements and distinct from the latter, being then for example a support specific to the device 10.

[0075] The support 12 of the pendulum damping device 10 can then be one of a component guide washer, a component phasing washer, or a separate support for said web, said guide washer and said phasing washer.

[0076] In the case where the device is integrated into a flywheel attached to the crankshaft, the support can be attached to this flywheel.

[0077] Support 12 could also be something else, such as a flange.

[0078] In the example considered, the support 12 generally has a ring shape made of a cut metal sheet, usually steel, typically less than 10 mm (millimeters) thick, preferably less than 6 mm, preferably less than 5 mm.

[0079] The support 12 extends axially, in a direction parallel to the X-axis of rotation, between two opposite lateral faces 16. The two lateral faces 16 may be planar. The two lateral faces 16 may extend between a radially inner edge and a radially outer edge. The radially inner edge may conventionally be circular in shape.

[0080] At least one window 15 passes through the support 12, following its thickness. Preferably, as many windows 15 as spacers 20 pass through the support 12. Each window 15 defines an empty space within the support 12. The windows 15 can be evenly distributed around the entire circumference of the support 12. Each spacer 20 can pass through one window 15. Each spacer 20 can be fully contained within the thickness of the window 15.

[0081] The device 10 further comprises at least one rolling element 40, for example a roller. Each pendulum body 13 is conventionally mounted to oscillate on the support 12, for example by means of a single rolling element 40.

[0082] Preferably, each pendulum body 13 is mounted to oscillate on the support 12 by means of two bearing members 40. Two bearing members 40 can pass through a single window 15 of the support 12 and guide the movement of the oscillating masses 14 of a pendulum body 13 relative to the support 12. Alternatively, each bearing member 40 can respectively pass through a window 15 of the support and guide the movement of the oscillating masses 14 relative to the support 12.

[0083] Each rolling element 40 can roll on a support bearing raceway 41, integral with the support 12, when the pendulum body 13 is supported by centrifugal force. Each rolling element 40 can roll on a pendulum body bearing raceway 42, integral with the pendulum body 13, when the pendulum body 13 is supported by centrifugal force. The edges of the windows 15, in particular the radially external portions of said edges, can define the support bearing races 41. The spacer 20 can form the pendulum body bearing raceway 42 or the pendulum body bearing races 42 when two rolling elements 40 are in the same window 15. More specifically, the radially external upper face 21 of the spacer 20 can form the pendulum body bearing raceway(s) 42.

[0084] The shape of the bearing tracks of support 41 and pendulum body 42 can be such that each pendulum body 13 is displaced relative to the support 12 at the same time: in translation around a fictitious axis parallel to the X axis of rotation of the support 12 and, also in rotation around the center of gravity of said pendulum body 13, such a movement being also called "combined movement" and disclosed for example in application DE 10 2011 086 532.

[0085] Alternatively, the shape of the aforementioned support 41 and pendulum body 42 bearing tracks can be such that each pendulum body 13 is only displaced relative to the support 12 in translation around a fictitious axis parallel to the X axis of rotation of the support 12.

[0086] Each rolling element 40 can be mounted freely in a window 15 of the support 12. Each rolling element 40 can have a bearing surface 43, adapted to be at least partially in contact with the bearing race of the support 41 and the bearing race of the pendulum body 42.

[0087] Each rolling element 40 can only be stressed in compression between the pendulum body raceway 42 and the support raceway 41. The pendulum body raceway 42 and the support raceway 41 cooperating with the same rolling element 40 can be at least partly radially opposite, i.e. there are planes perpendicular to the X axis of rotation in which these raceways both extend.

[0088] Each rolling element 40 can cooperate with the pendulum body rolling track 42 and with the support rolling track 41 only via its outer rolling surface 43.

[0089] All the pendulum body bearing tracks 42 can have exactly the same shape to each other and / or all the support bearing tracks 41 can have exactly the same shape to each other.

[0090] The pendulum bodies 13 are preferably distributed equiangularly around the X-axis. Preferably, there are two of them. Their number may be less than four. All the pendulum bodies 13 may be arranged circumferentially. The device 10 may thus comprise a plurality of planes perpendicular to the X-axis of rotation, in each of which all the pendulum bodies 13 are arranged.

[0091] The device 10 further includes at least one stop damper 50. The stop damper 50 may be made of an elastic material. The elastic material may be an elastomer or rubber. The elastic properties exhibited by the stop damper 50 may allow the damping of shocks related to the contact between the pendulum body 13 and the support 12. The stop damper 50 may be located on one of the circumferential ends of the spacer 20.

[0092] A manufacturing process for the pendulum damping device 10 may include a step of assembling the first and second oscillating masses 14 onto the support 12.

[0093] The first and second oscillating masses 14 of the pendulum body 13 are most often manufactured in a preliminary step from a sheet of metal. During this preliminary step, the first recess(es) 141 and the third recess(es) 143 can be made by punching.

[0094] During the preliminary stage, the second recess(es) 202 can also be made on the spacer(s) 20 by punching.

[0095] This preliminary step allows for the easy creation of cylindrical recesses with a predetermined diameter. The first, second, and third recesses can have the same diameter and be produced using the same tooling, which simplifies and reduces manufacturing costs.

[0096] The assembly comprising the first oscillating mass 14, the second oscillating mass 14 and, as in the example shown on the figure 10 , two spacers 20 thus prepared can be assembled on the support 12 during the assembly step.

[0097] In the manufacturing process according to the invention, this assembly step comprises a first insertion sequence, as shown in the figures 8 et 9 A rivet 30 is inserted into each of the first recesses of the first element. Here, the rivet 30 can be inserted into each of the first recesses 141 of the first oscillating mass 14. The first portion 34 of the body 33 of each rivet 30 can be in contact with the inner wall of each of the first recesses 141. The contact may have a small gap. The presence of a small gap may be sufficient to allow a good connection between the first element and the rivet 30. Preferably, the contact is gapless. The outer surface of the first portion 34 of the body 33 of the rivet 30 can be in contact with the inner wall of the first recess 141. Alternatively, when the rivet 30 includes one or more grooves 37, the crests of the ribs present on the edges of the groove(s) 37 can be in contact with the inner wall of the first recess 141.The filling rate of each first recess 141 by one of the rivets 30 is greater than 50%, preferably greater than 80%, which ensures good resistance of the pendulum body 13 to centrifugal forces and impacts. The rivet(s) 30 and the first oscillating mass 14 are rigidly joined and form a sub-assembly. The first axial length L1 of the first portion can be equal to the thickness of the first recess 141. The head 31 of each rivet 30 can be in contact with the first oscillating mass 14.

[0098] The assembly step of the manufacturing process according to the invention may further include a second sequence of inserting the support 12. The subassembly is inserted onto the support 12. The first oscillating mass 14 is in contact with one of the lateral faces 16 of the support, and the rivets 30 pass through at least one of the windows 15 of the support 12, as shown in the figure 10 .

[0099] The assembly step of the manufacturing process according to the invention may further include a third sequence for inserting the second element. Here, spacers 20 are attached to the rivets 30. The second portion 35 of the body 33 of each rivet 30 can be inserted with play into each of the second recesses 202 to facilitate the mounting of the spacers 20.

[0100] During this third insertion sequence, it is also possible to add the stop dampers 50 onto the spacers 20.

[0101] The second and third insertion sequences can be reversed.

[0102] The assembly step of the manufacturing process according to the invention may further include a fourth sequence of inserting the rolling elements 40. Each of the rolling elements 40 is inserted between a support bearing track 41 and a pendulum body bearing track 42 in one of the windows 15 of the support 12, as shown in the figure 10 .

[0103] The assembly step of the manufacturing process according to the invention may further include a fifth sequence for inserting the third element, here the second oscillating mass 14. The second portion 35 of the body 33 of each of the rivets 30 can be inserted with play into each of the third recesses 143, as visible in the figure 11 , in order to facilitate the assembly of the second oscillating mass 14.

[0104] The manufacturing process includes a step of deforming the foot 32 of each of the rivets 30, as visible in the figure 12This deformation allows the first and second oscillating masses and the spacers 20 to be rigidly joined together. This deformation reduces the play between the second portion 35 of the body 33 of each rivet 30 and the inside of the third recesses 143. This reduction of play allows each third recess 143 to be filled by one of the rivets 30 more than 50%, preferably more than 80%, which guarantees good resistance of the pendulum body 13 to centrifugal force and shocks.

[0105] The various stages of the manufacturing process can be carried out cold.

[0106] According to the alternative in which the first portion 34 of the body 33 of the rivet 30 is axially in contact with the foot 32 and the second portion 35 of the body 33 of the rivet 30 is axially in contact with the head 31, the first element can be the second oscillating mass 14 belonging to said pendulum body 13, the second element can be the connecting member and the third element can be the first oscillating mass 14. In addition, the insertion steps of the manufacturing process follow each other as follows: fifth sequence, second sequence, third sequence, fourth sequence and first sequence.

[0107] During the fifth sequence, the head 31 of each rivet 30 can be in contact with the first oscillating mass 14 and the second portion 35 of the body 33 of each rivet 30 can be inserted with play into each of the recesses of the first oscillating mass 14.

[0108] During the first sequence, the first portion 34 of the body 33 of each rivet 30 can be in contact, without play or with little play, with the inner wall of each of the recesses of the second mass 14.

[0109] According to the alternative in which the first portion 34 of the body 33 of the rivet 30 is axially located between two second portions 35 of the body 33 of the rivet 30, the first element can be the connecting member, the second element can be the first oscillating mass 14 and the third element can be the second oscillating mass 14. In addition, the insertion steps of the manufacturing process follow each other as follows: third sequence, second sequence, first sequence, fourth sequence and fifth sequence.

[0110] During the third sequence, the head 31 of each rivet 30 can be in contact with the first oscillating mass 14 and the first second portion 35 of the body 33 of each rivet 30 can be inserted with play into each of the recesses of the first oscillating mass 14.

[0111] During the first sequence, the first portion 34 of the body 33 of each rivet 30 can be in contact, without play or with little play, with the inner wall of each of the recesses of the spacer 20.

[0112] During the fifth sequence, the second portion 35 of the body 33 of each rivet 30 can be inserted with play into each of the recesses of the second oscillating mass 14.

[0113] Of course, the invention is not limited to the embodiments described and shown, which are provided for illustrative purposes only. The different embodiments could also be combined.

Claims

1. Assembly, in particular a pendulum body (13) for a pendulum damping device (10) intended to equip a vehicle transmission, before assembly, comprising: - a first element having a first recess (141) with a sixth diameter (D6), - a third element having a third recess (143) with an eighth diameter (D8), the eighth diameter (D8) being identical to the sixth diameter (D6) of the first recess (141) of the first element. - a rivet (30) extending axially between a head (31) and a foot (32) and comprising a body (33) located axially between the head and the foot, said rivet body comprising a first portion (34), having a first diameter (D1), and a second portion (35), having a second diameter (D2) less than the first diameter (D1), and wherein the first diameter (D1) of the first portion (34) of the body (33) of the rivet is equal to the sixth diameter (D6) of the first recess (141) of the first element.

2. Assembly according to claim 1, wherein the head (31) of the rivet (30) has a fourth diameter (D4) greater than the first diameter (D1), and wherein the first portion (34) of the rivet (30) is axially in contact with the head (31) and the second portion (35) of the rivet (30) is axially in contact with the foot (32).

3. Assembly according to claim 1, wherein the head (31) of the rivet (30) has a fourth diameter (D4) greater than the first diameter (D1), and wherein the first portion (34) of the rivet (30) is axially in contact with the foot (32) and the second portion (35) of the rivet (30) is axially in contact with the head (31).

4. Assembly according to claim 1, wherein the body (33) of the rivet (30) comprises two second portions (35), the first portion (34) of the rivet (30) being located axially between the two second portions (35).

5. Assembly according to any one of the preceding claims, wherein the body (33) of the rivet (30) further comprises an intermediate portion (36) located axially between the first portion (34) and the second portion (35) of the rivet (30), the intermediate portion (36) having a third diameter (D3) between the second diameter (D2) and the first diameter (D1).

6. Assembly according to any one of the preceding claims, wherein the first portion (34) of the body (33) of the rivet (30) comprises a groove (37).

7. Assembly according to any one of the preceding claims, further comprising a second element having a second recess (202) with a seventh diameter (D7), the second diameter (D2) of the second portion (35) of the body (33) of the rivet (30) being less than said seventh diameter (D7).

8. Method of manufacturing an assembly according to any one of the preceding claims, comprising the following steps: - Providing a first element having a first recess (141) with a sixth diameter (D6), - Providing a rivet (30) extending axially between a head (31) and a foot (32) and comprising a body (33) located axially between the head and the foot, said body comprising a first portion (34) having a first diameter (D1), the first diameter (D1) being equal to said sixth diameter (D6), and a second portion (35) having a second diameter (D2) less than the first diameter (D1), - Pairing the first element with the rivet (30) by inserting the first portion (34) of the body of said rivet into the first recess (141) of said first element. - Providing a third element having a third recess (143) with an eighth diameter (D8) identical to the sixth diameter (D6) of the first recess (141) of the first element, - Inserting the second portion (35) of the rivet body into the third recess (143), - Deforming the foot (32) of the rivet to pair the first element with the third element so that the second portion (35) of the rivet body deforms to fill the third recess.

9. Method according to the preceding claim, wherein the first element is a first oscillating mass (14) and the third element is a second oscillating mass (14) of a pendulum body (13) of a pendulum damping device (10), in particular intended to equip a vehicle transmission.

10. Method according to any one of the two preceding claims, further comprising, between the third step and the fourth step of claim 8, the steps of: - Providing a second element having a second recess (202) with a seventh diameter (D7) greater than the second diameter (D2) of the second portion (35) of the body (33) of the rivet (30), - Inserting the second portion (35) of the rivet body into the second recess (202), - The last step of claim 8 consisting of deforming the foot (32) of the rivet to pair the first element with the second element and the third element so that the second portion (35) of the rivet body deforms to fill the second recess and the third recess.

11. Method according to the preceding claim, wherein the second element is a connecting member (20) belonging to the pendulum body (13) adapted to pair the first oscillating mass with the second oscillating mass.