SUPPORT FOR A PENDULUM DAMPING DEVICE, AND PENDULUM DAMPING DEVICE COMPRISING SUCH A SUPPORT

Abstract

A support (4) for a pendulum damping device (2), comprising: a first portion (7) capable of being connected to a component (1) of a motor vehicle transmission system; and a second portion (8) in which is configured at least one first raceway capable of interacting with a bearing member (21) in order to guide the displacement of a pendulum assembly (5),
the first portion (7) and the second portion (8) being rigidly connected to one another, and the first portion (7) being obtained by cutting out the central zone of the second portion (8).

Claims

1. A support (4) for a pendulum damping device (2), comprising: a first portion (7) capable of being connected to a component (1) of a motor vehicle transmission system; and a second portion (8) in which is configured at least one first raceway capable of interacting with a bearing member (21) in order to guide the displacement of a pendulum assembly (5), the first portion (7) and the second portion (8) being rigidly connected to one another, and the first portion (7) being obtained by cutting out the central zone of the second portion (8).

2. The support according to claim 1, wherein the first portion (7) of the support (4) having on its radially external periphery an alternation of solid regions (10) and open regions (11), the second portion (8) of the support (4) having on its radially internal periphery an alternation of solid regions (12) and open regions (13).

3. The support according to claim 2, wherein each solid region (10) and open region (11) of the first portion (7) of the support respectively having a shape complementary to that of a respective open region (13) and solid region (12) of the second portion (8) of the support (4).

4. The support according to claim 2, wherein each solid region (10) and open region (11) of the first portion (7) of the support (4) respectively being axially opposite all or part of a respective solid region (12) and open region (13) of the second portion (8) of the support (4).

5. The support according to claim 4, wherein the rigid connection utilizing coupling members (15), each coupling member (15) being received in a zone of a solid region (10) of the first portion (7) of the support (4) and in a zone of a solid region (12) of the second portion (8) of the support (4), said zones being axially opposite.

6. A pendulum damping device (2) comprising: a support (4) according to claim 1, and at least one pendulum assembly (5) movable with respect to the support (4), the displacement of that pendulum assembly (5) with respect to the support (4) being guided by at least one bearing member (21) interacting with the first raceway and with at least one second raceway integral with the pendulum assembly (5).

7. The damping device according to claim 6, wherein the pendulum assembly (5) comprising a first pendulum mass (6) arranged axially on a first side of the second portion (8) of the support (4) and a second pendulum mass (6) arranged axially on a second side of the second portion (8) of the support (4), the first and the second pendulum mass (6) being integrated with one another via at least one connecting member (20).

8. The device according to claim 6, further comprising a system (30) for attenuating the noise produced upon an impact of the pendulum assembly (5) against the support (4), said system (30) being arranged axially on each side of the second portion (8) of the support (4) and axially clamping the latter.

9. The device according to claim 8, wherein the noise attenuation system (30) comprising a first element (31) arranged axially on a first side of the second portion (8) of the support (4) and a second element (32) arranged axially on a second side of the second portion (8) of the support (4), the first element (31) and the second element (32) being separate parts integrated with the support (4).

10. The device according to claim 8, wherein the noise attenuation system (30) being different from an abutment damping member simultaneously coming into contact with the pendulum assembly (5) and the support (4) in order to damp the abutment of the pendulum assembly (5) against the support (4).

11. A clutch friction disc (1) comprising a pendulum damping device (2) according to claim 6.

12. The support according to claim 3, wherein each solid region (10) and open region (11) of the first portion (7) of the support (4) respectively being axially opposite all or part of a respective solid region (12) and open region (13) of the second portion (8) of the support (4).

13. A pendulum damping device (2), comprising: a support (4) according to claim 2, and at least one pendulum assembly (5) movable with respect to the support (4), the displacement of that pendulum assembly (5) with respect to the support (4) being guided by at least one bearing member (21) interacting on the one hand with the first raceway and on the other hand with at least one second raceway integral with the pendulum assembly (5).

14. A pendulum damping device (2), comprising: a support (4) according to claim 3, and at least one pendulum assembly (5) movable with respect to the support (4), the displacement of that pendulum assembly (5) with respect to the support (4) being guided by at least one bearing member (21) interacting on the one hand with the first raceway and on the other hand with at least one second raceway integral with the pendulum assembly (5).

15. A pendulum damping device (2), comprising: a support (4) according to claim 4, and at least one pendulum assembly (5) movable with respect to the support (4), the displacement of that pendulum assembly (5) with respect to the support (4) being guided by at least one bearing member (21) interacting on the one hand with the first raceway and on the other hand with at least one second raceway integral with the pendulum assembly (5).

16. A pendulum damping device (2) comprising: a support (4) according to claim 5, and at least one pendulum assembly (5) movable with respect to the support (4), the displacement of that pendulum assembly (5) with respect to the support (4) being guided by at least one bearing member (21) interacting on the one hand with the first raceway and on the other hand with at least one second raceway integral with the pendulum assembly (5).

17. The device according to claim 7, comprising a system (30) for attenuating the noise produced upon an impact of the pendulum assembly (5) against the support (4), said system (30) being arranged axially on each side of the second portion (8) of the support (4) and axially clamping the latter.

18. The device according to claim 9, the noise attenuation system (30) being different from an abutment damping member simultaneously coming into contact with the pendulum assembly (5) and the support (4) in order to damp the abutment of the pendulum assembly (5) against the support (4).

19. A method for producing a support for a pendulum damping device, the method comprising the steps of: cutting out a central zone of a metal sheet to form a first support portion (7) connectable to a component of a vehicle transmission system, the remainder of the metal sheet forming a second support portion (8) having at least one first raceway capable of interacting with a bearing member in order to guide the displacement of a pendulum assembly; and rigidly connecting the first support portion (7) and the second support portion (8) to one another.

20. The method according to claim 19, further comprising the step of subjecting the second support portion (8) to a hardening treatment following the step of cutting out the metal sheet and before the step of rigidly connecting the first and second support portions (7, 8).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0095] A better understanding of the invention will be gained from reading the description below of a non-limiting exemplifying embodiment thereof, and from an examination of the attached drawings, in which:

[0096] FIG. 1 depicts, in part and in exploded fashion, a transmission system component having a pendulum damping device; and

[0097] FIG. 2 depicts the component of FIG. 1 when it is assembled.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

[0098] FIG. 1 depicts a transmission system component 1 comprising a pendulum damping device 2 according to an exemplifying embodiment of the invention.

[0099] That component 1 is in this case a clutch friction disk, only hub 3 being depicted here. That component 1 is associated, for example, with a combustion engine, in particular having two, three, or four cylinders.

[0100] In the example considered, pendulum damping device 2 comprises: [0101] a support 4 capable of moving rotationally around an axis X, and [0102] a plurality of pendulum assemblies 5 movable with respect to support 4.

[0103] Three pendulum assemblies 5 are provided in the example considered, being distributed uniformly around axis X.

[0104] It is evident from FIGS. 1 and 2 that support 4 here comprises two different portions 7 and 8.

[0105] First portion 7 extends for the most part radially inside second portion 8, and that first portion 7 serves to physically attach pendulum damping device 2 to hub 3, in particular by welding.

[0106] Second portion 8 serves to guide the displacement of pendulum assemblies 5, as will be seen later.

[0107] First portion 7 is produced here by cutting out the central zone of second portion 8 of the support.

[0108] As is evident from FIG. 1, in the example described, first portion 7 of support 4 has on its radially external periphery an alternation of solid regions 10 and open regions 11.

[0109] Similarly, second portion 8 of support 4 has on its radially internal periphery an alternation of solid regions 12 and open regions 13.

[0110] Because of the cutting that is performed, each solid region 10 of first portion 7 of the support has a shape complementary to the shape of each open region 13 of second portion 8 of support 4, and each solid region 12 of second portion 8 of support 2 has a shape complementary to the shape of each open region 11 of first portion 7 of support 4. It is thus evident that each solid region 10 is in the shape of a petal extending radially outward from a ring 14 fastened on hub 3.

[0111] As is evident from FIG. 2, in the assembled state each solid region 10 of first portion 7 of support 4 is axially opposite a solid region 12 of second portion 8 of support 4. Similarly, each open region 11 of first portion 7 of support 4 is axially opposite an open region 13 of second portion 8 of support 4.

[0112] Each solid region 10 and 12 has in this case a through hole, and the positioning of first portion 7 and of second portion 8 of support 4 allows those two holes to be axially aligned so that a screw or a rivet 15, forming a coupling member, is received through those two holes.

[0113] In the example considered, second portion 8 of support 4 has overall an annular shape having two opposite sides that in this case are planar faces.

[0114] As is evident from FIGS. 1 and 2, in the example considered each pendulum assembly 5 comprises: [0115] two pendulum masses 6, each pendulum mass 6 extending axially oppositely from one side of second portion 7 of support 4, and [0116] two connecting members 20 integrating the two pendulum masses 6.

[0117] In the example considered, connecting members 20, also called “spacers,” are offset angularly.

[0118] In FIGS. 1 and 2 pendulum damping device 2 is inactive, i.e. it is not filtering torsional oscillations transmitted by the drivetrain as a result of irregularities of the combustion engine.

[0119] In the example shown in the Figures, each end of a connecting member 20 is welded onto a pendulum mass 6. In variants, each of those ends may be force-fitted into an opening configured in one of pendulum masses 6 of pendulum assembly 5 in order to integrate those two pendulum masses 6 with one another.

[0120] Each connecting member 20 extends in part in a window 22 configured in second portion 7 of support 4. In the example considered, window 22 defines an open space inside the support, that window being delimited by a continuous contour.

[0121] In the example considered, device 2 also comprises bearing members 21 that guide the displacement of pendulum assemblies 5 with respect to support 4. The bearing members are, for example, rollers.

[0122] In the example described, the movement of each pendulum assembly 5 with respect to support 4 is guided by two bearing members 21, each of them interacting, in the example shown in the Figures, with one of connecting members 20 of pendulum assembly 5.

[0123] Each bearing member interacts here with only one first raceway integral with support 4, and with only one second raceway integral with pendulum assembly 5, in order to guide the displacement of pendulum assembly 5.

[0124] In the example considered, each second raceway is formed by a radially external edge region of a connecting member 20.

[0125] Each first raceway is defined by a portion of the contour of a window 22.

[0126] Each first raceway is thus arranged radially opposite a second raceway, so that the same bearing surface of a bearing member 21 rolls alternatively on the first raceway and on the second raceway. The bearing surface of bearing member 21 is in this case a cylinder of constant radius.

[0127] As is evident from FIGS. 1 and 2, damping members for the abutment of pendulum assembly 5 against support 4 are provided. First abutment damping members 23 are carried by the pendulum assembly, each connecting member 20 being associated with one first abutment damping member 23. Those first abutment damping members 23 are configured here to be interposed between the associated connecting member 20 and the radially internal edge of window 22 that receives that connecting member 20. Second abutment damping members 26 are provided, also being carried by pendulum assembly 5 and configured to come into abutment against the radially external edge of second portion 8 of support 4 for low radial positions of that pendulum assembly 5.

[0128] As is also evident from FIGS. 1 and 2, in the example considered component 1 also comprises a system 30 for attenuating the noise produced upon impact of pendulum assembly 5 against support 4. This attenuation system 30 is arranged in this case on either side of second portion 8 of support 4, and axially clamps the latter.

[0129] Attenuation system 30 comprises here a first element 31 arranged axially on a first side of second portion 8 of support 4, and a second element 32 arranged axially on a second side of said second portion 8.

[0130] This first element 31 and this second element 32 are in this case separate parts integrated with second portion 8 of support 4, that integration involving in particular a bolting operation or hot riveting of plastic rivets.

[0131] As is evident from FIGS. 1 and 2, each element 31 and 32 of attenuation system 30 has on its radially internal periphery an alternation of open regions 33 and solid regions 34. It is apparent from FIG. 2 that each solid region 34 of first element 31 is axially opposite a solid region 34 of second element 32, while being axially opposite an open region 11 of first portion 7 of support 4 and an open region 13 of second portion 8 of support 4. These solid regions 34 each have a hole 35, and those two holes are aligned in order to receive a screw or rivet arranged axially in open regions 11 and 13 of the first and second portion of support 4.

[0132] The invention is not limited to the example that has just been described.