PENDULUM-TYPE DAMPING DEVICE

Abstract

A vehicle transmission system component including a first subassembly having an input and an output, between which a torque can be transmitted. A second subassembly forms a pendulum-type damping device, and disposed outside the path of the torque transmitted by the first subassembly. The first and the second subassemblies are connected to one another by at least one connecting element capable of being elastically deformed circumferentially.

Claims

1. A vehicle transmission system component, comprising: a first subassembly having an input and an output, between which a torque can be transmitted, and a second subassembly forming a pendulum-type damping device, and disposed outside the path of the torque transmitted by the first subassembly, wherein the first and the second subassemblies are connected to one another by at least one connecting means capable of being elastically deformed circumferentially, wherein this connecting means comprises at least one waved part.

2. The component according to claim 1, wherein the connecting means can also be elastically deformed axially.

3. The component according to claim 1, wherein the second subassembly is disposed radially exterior to the first subassembly, the radially external surface of the first subassembly defines a succession of radial teeth, and the radially internal surface of the second subassembly defines a succession of radial teeth.

4. The component according to claim 3, wherein each radial tooth of the radially external surface of the first subassembly is disposed circumferentially between two consecutive radial teeth of the radially internal surface of the second subassembly, in such a way that, in a trajectory over a given periphery, an alternation of radial teeth of the radially external surface of the first subassembly and of radial teeth of the radially internal surface of the second subassembly is found.

5. The component according to claim 1, wherein the connecting means is a waved washer fixed both on the first subassembly and on the second subassembly.

6. The component according to claim 5, comprising first elements for fixation of the waved washer on the first subassembly and second elements for fixation of the waved washer on the second subassembly, wherein each first fixation element alternates circumferentially with a second fixation element.

7. The component according to claim 5, wherein the waved washer carries at least one arm that becomes axially braced against one of the first and of the second subassembly.

8. The component according to claim 6, wherein the arm is disposed radially in the prolongation of a portion of the waved tab receiving an element for fixation to the other of the first and of the second subassembly.

9. The component according to claim 1, wherein the connecting means comprises a plurality of waved tabs disposed in circumferential succession, and each waved tab is fixed both on the first subassembly and on the second subassembly.

10. The component according to claim 9, wherein each waved tab is fixed on the first subassembly via at least one first fixation element and on the second subassembly via at least one second, fixation element, and the waved tabs are positioned in such a way that, in a trajectory over a given periphery, an alternation of first and second fixation elements is found.

11. The component according to claim 9, wherein at least one waved tab carries an arm that becomes axially braced against one of the first and of the second subassembly.

12. The component according to claim 11, wherein the arm is disposed radially in the prolongation of a portion of the waved tab receiving an element for fixation to the other of the first and of the second subassembly.

13. The component according to claim 9, wherein at least one waved tab comprises a portion forming an axial reciprocation capability, and the said portion is received in a free space provided circumferentially between the first subassembly and the second subassembly.

14. The component according to claim 1, wherein the connecting means is made of steel or of spring steel.

15. The component according to claim 1, forming a clutch friction disk.

16. A vehicle transmission system component, comprising: a first subassembly having an input and an output, between which a torque can be transmitted, and a second subassembly forming a pendulum-type damping device, and disposed outside the path of the torque transmitted by the first subassembly, wherein the first and the second subassemblies are connected to one another by at least one connecting means capable of being elastically deformed circumferentially. the connecting means carries at least one arm that becomes axially braced against one of the first and of the second subassembly, and this arm is disposed radially in the prolongation of a portion of the connecting means capable of receiving an element for fixation to the other of the first and of the second subassembly.

17. The component according to claim 2, wherein the second subassembly is disposed radially exterior to the first subassembly, the radially external surface of the first subassembly defines a succession of radial teeth, and the radially internal surface of the second subassembly defines a succession of radial teeth.

18. The component according to claim 4, wherein the connecting means is a waved washer fixed both on the first subassembly and on the second subassembly.

19. The component according to claim 6, wherein the waved washer carries at least one arm that becomes axially braced against one of the first and of the second subassembly.

20. The component according to claim 7, wherein the arm is disposed radially in the prolongation of a portion of the waved tab receiving an element for fixation to the other of the first and of the second subassembly.

Description

[0114] The invention will be more understandable by reading the description hereinafter of non-limitative exemplary embodiments thereof and by examining the attached drawing, wherein:

[0115] FIG. 1 schematically represents a transmission system component with a connecting means according to a first exemplary embodiment of the invention,

[0116] FIG. 2 represents the connecting means of FIG. 1 in isolation,

[0117] FIG. 3 represents a detail of FIG. 2,

[0118] FIG. 4 represents a detail of FIG. 1,

[0119] FIGS. 5 and 6 respectively represent, in the exploded state and in the assembled state respectively, a transmission system component with a connecting means according to a second exemplary embodiment of the invention,

[0120] FIG. 7 represents a waved tab of a connecting means according to the second exemplary embodiment of the invention in isolation,

[0121] FIG. 8 represents, similarly to FIG. 7, a waved tab of an alternative of the second exemplary embodiment of the invention, and

[0122] FIG. 9 is a partial view of a transmission system component equipped with tabs according to FIG. 8.

[0123] FIGS. 1 to 4 represent a transmission system component 10 according to a first exemplary embodiment of the invention.

[0124] Here, this component 10 is a clutch friction disk, for example associated with a combustion engine, especially with two, three or four cylinders. Here, component 10 comprises: [0125] a first subassembly having an input and an output, between which a torque can be transmitted, and [0126] a second subassembly forming a pendulum-type damping device 1, and disposed outside the path of the torque transmitted by the first subassembly.

[0127] Of the first subassembly, FIG. 1 shows only hub 7 of the friction disk defining the torque output of this subassembly. The torque input of this first subassembly is formed in known manner by friction coatings, not illustrated.

[0128] In the example under consideration, pendulum-type damping device 1 formed by the second subassembly comprises: [0129] a support 2 capable of being displaced by rotation around an axis X, and [0130] a plurality of pendulum-type members 3 capable of moving relative to support 2.

[0131] In the example under consideration, four pendulum-type members 3 are provided and are uniformly distributed over the periphery of axis X.

[0132] Support 2 here is made in one piece, in the form of a plate extending between two substantially parallel sides 4.

[0133] As can be seen in the figures, each pendulum-type member 3 comprises, in the example under consideration: [0134] two pendulum-type masses 5, wherein one of these pendulum-type masses 5 is a first pendulum-type mass 5 disposed axially facing a first side 4 of the support, while the other of these pendulum-type masses 5 is a second pendulum-type mass 5 disposed axially facing a second side 4 of support 2, and [0135] two connecting crosspieces 6 making the two pendulum-type masses 5 integral with one another.

[0136] In the example under consideration, connecting crosspieces 6 are offset angularly.

[0137] In the figures, pendulum-type damping device 1 is at rest, and so it is not filtering the torsional oscillations propagating in the transmission system due to rotational irregularities of the combustion engine.

[0138] In the example of the figures, each end of a connecting crosspiece 6 is force-fitted into an opening 17 provided in a respective pendulum-type mass, in such a way as to make these two pendulum-type masses 5 integral with one another. In variants, each of these ends could be riveted or welded, or screwed onto one of the pendulum-type masses 5. Each connecting crosspiece 6 extends partly into a window provided in support 2, wherein this window defines an empty space, bounded by a closed contour 20, in the interior of support 2.

[0139] Although they are not illustrated, device 1 also comprises, in the example under consideration, rolling means guiding the displacement of pendulum-type members 3 relative to support 2. As an example, the rolling means are rollers.

[0140] In the described example, the movement of each pendulum-type member 3 relative to support 2 is guided by two rolling means, wherein each of these cooperates here with one of the connecting crosspieces 6 of pendulum-type member 3.

[0141] Here, each rolling means cooperates with a single first rolling track integral with support 2 and with a single second rolling track integral with pendulum-type member 3 in order to guide the displacement of this pendulum-type member 3.

[0142] In the example under consideration, each second rolling track is formed by a portion of the radially external rim of a connecting crosspiece 6.

[0143] Each first rolling track is defined by a part of the contour of an aforesaid window.

[0144] Each first rolling track is therefore disposed radially facing a second rolling track, in such a way that a given rolling surface of a rolling means rolls alternatively over the first rolling track and over the second rolling track. Here, the rolling surface of the rolling means is a cylinder of constant radius.

[0145] As can be surmised in FIG. 1 in particular, damping means 22 may be provided for abutting pendulum-type member 3 against support 2. Each connecting crosspiece 6 is then associated with such an abutting damping means 22, wherein each of these latter is configured to be interposed between this connecting crosspiece 6 and the radially interior rim of the window receiving this connecting crosspiece 6.

[0146] As can be seen in the figures, at least one connecting means 30 connects hub 7 of the friction disk to support 2 of the pendulum-type damping device. This connecting means 30 may be deformed elastically in the circumferential sense and, advantageously, also in the axial sense.

[0147] As is obvious in FIG. 4 in particular, here the radially external surface of hub 7 of the friction disk defines a succession of radial teeth 27, and the radially internal surface of support 2 of pendulum-type damping device 1 defines a succession of radial teeth 28.

[0148] FIG. 4 also shows that each radial tooth 28 is disposed circumferentially between two consecutive radial teeth 27, in such a way that, in a trajectory over a given periphery, an alternation of radial teeth 27 and of radial teeth 28 is found.

[0149] According to the first exemplary embodiment of the invention as described with reference to FIGS. 1 to 4, the connecting means is a waved washer 31.

[0150] This waved washer 31 is fixed both to hub 7 of the friction disk via radial teeth 27 and to support 2 of pendulum-type damping device 1 via radial teeth 28. This waved washer 31 has, for example, along a circumferential trajectory, a succession of zones axially offset in pairs Such a washer is obtained, for example, on the basis of a washer of the Onduflex® type. It is apparent that component 1 comprises first elements 35 for fixation of waved washer 31 on radial teeth 27 of hub 7 of friction disk 1, and second elements 35 for fixation of waved washer 31 on support 2 of pendulum-type damping device 1.

[0151] It is apparent in FIG. 1 that each first fixation element 35 alternates circumferentially with a second fixation element 35. Here, all of these fixation elements 35 are rivets.

[0152] It is also apparent in FIGS. 1 to 4 that waved washer 31 may have: [0153] a plurality of first portions 33, wherein each first portion 33 receives a first element 35 for fixation of waved washer 31 on hub 7 of the friction disk, and [0154] a plurality of second portions 34, wherein each second portion 34 receives a second element 35 for fixation of waved washer 31 on support 2 of pendulum-type damping device 1.

[0155] Furthermore, it is apparent that each first portion 33 of waved washer 31 alternates with a second portion 34 of waved washer 31 in the circumferential sense.

[0156] It is also apparent in FIG. 2 that first portions 33 of waved washer 31 occupy, in the example under consideration, a given axial position, which is also that occupied by second portions 34 of this washer 31. Portions 37 of waved washer 31, which are offset axially relative to these first 33 and second 34 portions, also exist.

[0157] It is also apparent, especially in FIGS. 2 and 3, that waved washer 31 may carry a plurality of arms 36 that become braced axially against support 2 of pendulum-type damping device 2. Here, each arm 36 is disposed radially in the prolongation of a portion 33 of waved washer 31 receiving a first element 35 for fixation on hub 7 of the friction disk. Here, such an arm 36 has a curved free end that makes frictional contact against support 2 via axial bracing.

[0158] It is apparent in FIG. 1 that the number of arms 36 may be equal to the number of first fixation elements 35.

[0159] As an example, waved washer 31 is made of steel or of spring steel.

[0160] A single connecting means 30 is illustrated in FIGS. 1 to 4. However, component 1 may comprise two distinct connecting means 30, wherein each connecting means 30 is then formed by a waved washer 31 such as described in the foregoing. Each washer 31 is then disposed axially on only one side of support 2. In this case, first fixation elements 35 may be common to both connecting means 30, just as may second fixation elements 35. Stated otherwise, a given rivet 35 may, in the described example, connect on the one hand hub 7 to waved washer 31 of first connecting means 30 and on the other hand to waved washer 31 of the second connecting means. Two alternatives of a component with a connecting means 40 according to a second exemplary embodiment of the invention will now be described with reference to FIGS. 5 to 9.

[0161] FIGS. 5 to 9 show that two connecting means 40 are provided here, wherein one of these connecting means 40 is disposed axially on a first side 4 of support 2 of pendulum-type damping device 1, while the other connecting means 40 is disposed axially on a second side 4 of this support 2.

[0162] According to this second exemplary embodiment of the invention, connecting means 40 is formed by a plurality of waved tabs 41 disposed in circumferential succession, wherein each waved tab 41 is fixed both on the first subassembly and on the second subassembly. Here, each waved tab 41 is fixed to one radial tooth 27 of hub 7 of the clutch disk and to one radial tooth 28 of support 2 of pendulum-type damping device 1.

[0163] Here the number of waved tabs 41 is equal to four.

[0164] Here, each waved tab 41 has, along a circumferential trajectory, a succession of zones axially offset in pairs. Each waved tab 41 is fixed to one radial tooth 27 of hub 7 of the friction disk via a first fixation element 35, and it is fixed to one radial tooth 28 of support 2 of pendulum-type damping device 1 via a second fixation element 35. It is apparent that waved tabs 41 are positioned in such a way that, in a trajectory over a given periphery, an alternation of first and second fixation elements is found.

[0165] Each waved tab 41 has, in FIGS. 5 to 9: [0166] a first portion 43 receiving a first element 35 for fixation of waved tab 41 on hub 7 of the friction disk, and [0167] a second portion 44 receiving a second element 35 for fixation of waved tab 41 on support 2 of pendulum-type damping device 1.

[0168] It is also apparent in FIGS. 5 to 9 that, from one waved tab to the other, the first or respectively second portion occupies the same circumferential position on the tab.

[0169] It is also apparent in FIGS. 5 to 9 that, within a given waved tab 41, the first portion 43 and the second portion 44 occupy the same axial position. The waved washer then comprises a portion offset axially relative to these first 43 and second 44 portions.

[0170] The first 35 and second 35 connecting elements may be identical to one another, here in the form of rivets common to both connecting means 40.

[0171] Similarly to the first exemplary embodiment described in the foregoing, each waved tab 41 may carry an arm 46 that becomes braced axially against support 2 of pendulum-type damping device 1. Here, this arm 46 is disposed radially in the prolongation of a first portion 43 of waved tab 41. As an example, arm 46 has a curved free end that makes frictional contact against support 2 via axial bracing.

[0172] The alternative of FIGS. 8 and 9 is distinguished from that according to FIGS. 5 to 7 by the fact that portion 48 of waved tab 41, which is axially at a distance from first 43 and second 44 portions of this waved tab 41, forms an axial reciprocating capability received in a free space provided circumferentially between a tooth 27 of hub 7 of the friction disk and a tooth 28 of support 2 of pendulum-type damping device 1.

[0173] According to the second exemplary embodiment of the invention, each tab 41 may be made of steel or of spring steel.

[0174] Friction disk 1 may comprise a damper and, as the case may be, also a pre-damper.

[0175] The invention is not limited to the examples that have just been described.