Device for damping torsional oscillations

Abstract

A device for damping torsional oscillations, comprising: a support capable of moving rotationally around an axis; a plurality of pendulum bodies, each pendulum body being movable with respect to the support; and a plurality of bearing members, each bearing member interacting with a first raceway integral with the support and with at least one second raceway integral with a pendulum body, the movement of each pendulum body with respect to the support being guided by two of those bearing members, the support comprising a plurality of windows in each of which two bearing members are received, one of those bearing members interacting with at least one second raceway integral with one of the pendulum bodies, and the other of those bearing members interacting with at least one second raceway integral with another of those pendulum bodies, the pendulum bodies being circumferentially adjacent.

Claims

1. A device (1) for damping torsional oscillations, the device comprising: a support (2) rotatable around an axis (X); a plurality of pendulum bodies (3), each pendulum body (3) configured to move with respect to the support (2); and a plurality of bearing members (11), each bearing member (11) configured to engage a first raceway (12) of the support (2) and at least one second raceway (13) of a pendulum body (3), the movement of each pendulum body (3) with respect to the support (2) being guided by two of the bearing members (11), the support (2) comprising a plurality of windows (19), each window (19) receiving two of the bearing members (11), one of the two bearing members (11) configured to engage at least one second raceway (13) of one of the pendulum bodies (3), and the other of the two bearing members (11) configured to engage at least one second raceway (13) of another of the pendulum bodies (3), the pendulum bodies (3) being circumferentially adjacent.

2. The device according to claim 1, wherein each pendulum body (3) comprising two first abutment damping members (30), each first abutment damping member (30) projecting circumferentially toward the circumferentially adjacent pendulum body (3) so that the two first abutment damping members (30) that are circumferentially facing and belong respectively to two circumferentially adjacent pendulum bodies (3) are configured to contact with one another upon movement of the pendulum bodies (3), and wherein each first abutment damping member (30) is arranged in one of the windows (19) of the support (2).

3. The device according to claim 2, wherein each pendulum body (3) further comprises at least one second abutment damping member (25) abutting against the support (2).

4. The device according to claim 2, wherein each pendulum body (3) comprises: a first pendulum mass (5) and a second pendulum mass (5) axially spaced with respect to one another, the first pendulum mass (5) being arranged axially on a first side (4) of the support (2) and the second pendulum mass (5) being arranged axially on a second side (4) of the support (2); and at least one connecting member (6) connecting the first pendulum mass and the second pendulum mass (5) for pairing the first and second pendulum masses.

5. The device according to claim 1, further comprising a plurality of synchronization members (20) connecting circumferentially adjacent pendulum bodies (3) pairwise, wherein each synchronization member (20) is arranged in one of the windows (19) of the support (2).

6. The device according to claim 5, wherein each pendulum body (3) comprising at least one abutment damping member (25) abutting against the support (2).

7. The device according to claim 5, wherein each pendulum body (3) comprises: a first pendulum mass (5) and a second pendulum mass (5) axially spaced with respect to one another, the first pendulum mass (5) being arranged axially on a first side (4) of the support (2) and the second pendulum mass (5) being arranged axially on a second side (4) of the support (2); and at least one connecting member (6) connecting the first pendulum mass and the second pendulum mass (5) for pairing the first and second pendulum masses.

8. The device according to claim 1, wherein each pendulum body (3) comprises at least one abutment damping member (25) abutting against the support (2).

9. The device according to claim 8, wherein each pendulum body (3) comprises: a first pendulum mass (5) and a second pendulum mass (5) axially spaced with respect to one another, the first pendulum mass (5) being arranged axially on a first side (4) of the support (2) and the second pendulum mass (5) being arranged axially on a second side (4) of the support (2); and at least one connecting member (6) connecting the first pendulum mass and the second pendulum mass (5) for pairing the first and second pendulum masses.

10. The device according to claim 1, wherein each pendulum body (3) comprises: a first pendulum mass (5) and a second pendulum mass (5) axially spaced with respect to one another, the first pendulum mass (5) being arranged axially on a first side (4) of the support (2) and the second pendulum mass (5) being arranged axially on a second side (4) of the support (2); and at least one connecting member (6) connecting the first pendulum mass and the second pendulum mass (5) for pairing the first and second pendulum masses.

11. The device according to claim 10, wherein each pendulum body (3) extends angularly over a global angle value () measured from the axis (X) between two circumferential ends (7, 8) that correspond to circumferential ends of the first and second pendulum masses (5) of the pendulum body (3), wherein each second raceway (13) is arranged inside an angular sector () measured from the axis (X) and extending from one circumferential end (7, 8) of the pendulum body (3) toward the other circumferential end (7, 8) of the pendulum body (3), and wherein a ratio between the angular sector () and the global angle () being between 1/15 and 1/2.

12. The device according to claim 11, wherein the second raceway (13) integral with the pendulum body (3) being defined by the connecting member (6).

13. The device according to claim 11, wherein each bearing member (11) interacts with two second raceways (13) integral with the pendulum body (3), wherein one of the second raceways (13) is defined by the first pendulum mass (5) and the other of the second raceways (13) is defined by the second pendulum mass (5).

14. The device according to claim 10, wherein the second raceway (13) integral with the pendulum body (3) being defined by the connecting member (6).

15. The device according to claim 14, wherein each pendulum body (3) comprising two connecting members (6) pairing the first (5) and the second pendulum mass (5), each connecting member (6) defining a second raceway (13) interacting respectively with one of the two bearing members (11) guiding the movement of that pendulum body (3) with respect to the support (2).

16. The device according to claim 15, wherein each window (19) receiving: a bearing member (11) interacting with at least one second raceway (13) integral with one of the pendulum bodies (3); a connecting member (6) pairing the first (5) and the second pendulum mass (5) of that pendulum body (3); the other bearing member (11) interacting with at least one second raceway (13) integral with the other pendulum body (3), said pendulum bodies (3) being circumferentially adjacent; and a connecting member (6) pairing the first (5) and the second pendulum mass (5) of that other pendulum body (3).

17. The device according to claim 10, wherein each bearing member (11) interacts with two second raceways (13) integral with the pendulum body (3), and wherein one of the second raceways (13) is defined by the first pendulum mass (5) and the other of the second raceways (13) is defined by the second pendulum mass (5).

18. The device according to claim 17, wherein each pendulum body (3) comprises the at least one connecting member (6) pairing the first pendulum mass (5) and the second pendulum mass (5).

19. The device according to claim 18, wherein each pendulum body (3) comprises a plurality of connecting members (6), and wherein all the connecting members (6) of each of the pendulum masses (3) are arranged between the two bearing members (11) guiding the movement of that pendulum body (3) with respect to the support (2).

20. A component for a transmission system of a motor vehicle, the component being one of a dual mass flywheel, a hydrodynamic torque converter, a friction clutch disk, a dry dual clutch, a wet dual clutch, a wet single clutch and a flywheel integral with a crankshaft, the component comprising a damping device (1) according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) A better understanding of the invention may be gained from reading the description below of a non-limiting exemplifying embodiment thereof, and from an examination of the attached drawings, in which:

(2) FIG. 1 schematically depicts a device for damping torsional oscillations, according to a first embodiment of the invention;

(3) FIG. 2 shows a detail of FIG. 1;

(4) FIG. 3 is a view, similar to FIG. 2, of a second exemplifying embodiment of the invention;

(5) FIGS. 4 and 5 are different views of a variant of the second exemplifying embodiment of the invention;

(6) FIG. 6, similarly to FIG. 1, depicts another device for damping torsional oscillations according to the invention; and

(7) FIGS. 7 and 8 depict a detail of another device for damping torsional oscillations according to the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

(8) FIG. 1 depicts a device 1 for damping torsional oscillations, according to an embodiment of the invention. Damping device 1 is of the pendulum oscillator type. Device 1 is capable in particular of being part of a motor vehicle transmission system, for example being integrated into a component (not depicted) of such a transmission system, that component being, for example, a dual mass flywheel, a hydrodynamic torque converter, or a clutch disk.

(9) That component can be part of a drive train of a motor vehicle, the latter comprising a combustion engine having in particular three or four cylinders.

(10) In FIG. 1 device is inactive, i.e. it is not filtering the torsional oscillations transmitted by the drive train due to irregularities of the combustion engine.

(11) In known fashion, such a component can comprise a torsional damper exhibiting at least one input element, at least one output element, and circumferentially acting elastic return members that are interposed between said input and output elements. For purposes of the present Application the terms input and output are defined with respect to the direction of torque transmission from the combustion engine of the vehicle toward the latter's wheels.

(12) In the example considered, device 1 comprises:

(13) a support 2 capable of moving rotationally around an axis X; and

(14) a plurality of pendulum bodies 3 movable with respect to support 2.

(15) In the example considered, six pendulum bodies 3 are provided, being distributed uniformly around axis X.

(16) Support 2 of damping device 1 can be constituted by:

(17) an input element of the torsional damper;

(18) an output element or an intermediate phasing element arranged between two series of springs of the damper;

(19) an element rotationally connected to one of the aforementioned elements and different from the latter, being then, for example, a support specific to device 1.

(20) Support 2 is, in particular, a guide washer or a phase washer. The support can also be different, for example a flange of the component.

(21) In the example considered, support 2 is globally in the shape of a ring having two opposite sides 4 that here are planar faces.

(22) As is evident in particular from FIG. 1, in the example considered each pendulum body 3 comprises:

(23) two pendulum masses 5, each pendulum mass 5 extending axially facing one side 4 of support 2; and

(24) two connecting members 6 integrating the two pendulum masses 5.

(25) One of pendulum masses 5 is not depicted in FIGS. 2 and 3 so that support 2 can be seen better.

(26) In the example considered, connecting members 6, also called spacers, are angularly offset. Here each connecting member 6 is shifted angularly toward the outside of the each pendulum body 3. Each body 3 extends angularly over a global angle value , measured from rotation axis X of support 2, between two circumferential ends that correspond respectively to circumferential ends 7 and 8 of pendulum masses 5 of that body, and each connecting member 6 is then arranged inside a peripheral zone 9 of the pendulum body, that peripheral zone 9 extending from one end 7 or 8 of pendulum body 3 toward the other end 8 or 7 of that pendulum body over an angular sector measured from axis X, the ratio / being between 1/15 and , being in particular between 0.1 and 0.25. In other words, and as is evident in particular from FIG. 1, in the example described each pendulum body 3 successively comprises, moving from the inside of that pendulum body 3 from one circumferential end 7 toward its other circumferential end 8:

(27) a peripheral zone 9 in which one of connecting members 6 of pendulum body 3 is arranged;

(28) a central zone 10 having no connecting member 6; and

(29) another peripheral zone 9 in which the other connecting member 6 of pendulum body 3 is arranged.

(30) In the example of FIGS. 1 to 5, each end of a connecting member 6 is press-fitted into an opening 17 configured in one of pendulum masses 5 of pendulum body 3, in order to integrate those two pendulum masses 5 with one another. As a variant, each end of a connecting member is integrated with one of pendulum masses 5 by welding.

(31) Device 1 also comprises bearing members 11 guiding the movement of pendulum bodies 3 with respect to support 2. Bearing members 11 here are rollers exhibiting several different successive diameters.

(32) In the example described, the motion of each pendulum body 3 with respect to support 2 is guided by two bearing members 11.

(33) Each bearing member 11 is received in a window 19 configured in support 2. As depicted in these Figures, two bearing members 11 associated with two different and circumferentially adjacent pendulum bodies 3 are received in the same window 19 configured in support 2. In other words, a bearing member 11 guiding the movement of a pendulum body 3, and a bearing member 11 guiding the movement of another pendulum body 3 that is circumferentially adjacent, are received within the same window 19. Each window 19 has a continuous periphery 16, and a portion of that periphery 16 defines a first raceway 12, integral with support 2, on which one of bearing members 11 received in that window 19 will roll, while another portion of that continuous periphery 16 defines another first raceway 12, integral with support 2, on which the other bearing member 11 received in window 19 will roll.

(34) In the example of FIGS. 1 to 5 each window 19 furthermore receives:

(35) a connecting member 6 of a pendulum body 3; and

(36) a connecting member 6 of another pendulum body 3 that is circumferentially adjacent.

(37) In the example of FIGS. 1 to 5 each connecting member 6 defines a second raceway 13 that is integral with the pendulum body 3 to which that connecting member 6 belongs, and on which raceway one of bearing members 11 rolls in order to guide the movement of that pendulum body 3 with respect to support 2.

(38) In the example of FIGS. 1 and 2 synchronization members 20 are provided. Here each synchronization member 20 is interposed between two circumferentially adjacent pendulum bodies 3 that it connects to one another. Here each synchronization member 20 is integral with each of the pendulum bodies 3 that it connects.

(39) Each pendulum body 3 also comprises two second abutment damping members 25 for that pendulum body against support 2. One of these second abutment damping members 25 comes into contact with support 2, for example, following a counter-clockwise movement of pendulum body 3 from its inactive position and also in the case of a radial drop of that pendulum body 3, while the other second abutment damping member 25 comes into contact with support 2 following a clockwise movement of pendulum body 3 from its inactive position, and if applicable also in the case of a radial drop of that pendulum body 3.

(40) Each second abutment damping member 25 is, for example, positioned radially between a connecting member 6 and periphery 16 of window 19. In the example of FIGS. 1 and 2 each second abutment damping member 25 extends between two axial ends, each of them being received in a hole configured in one of pendulum masses 5 in order to integrate that second abutment damping member 25 with each of those pendulum masses 5.

(41) As is evident from FIG. 2, each second abutment damping member 25 can be implemented in several portions, and one of those portions can constitute a single part with a synchronizing member 20, that part here being made of elastomer.

(42) FIGS. 3 to 5 depict different variants of a second exemplifying embodiment of the invention. One of pendulum masses 5 of pendulum body 3 is not depicted in FIGS. 3 to 5. This second exemplifying embodiment differs from the one described with reference to FIGS. 1 and 2 in that device 1 has no synchronization members 20.

(43) According to this second example each pendulum body 3 comprises two first abutment damping members 30, each first abutment damping member 30 projecting circumferentially beyond one of circumferential ends 7 and 8 of pendulum body 3 toward the circumferentially adjacent pendulum body 3. Two first abutment damping members 30 that are circumferentially facing and belong respectively to two circumferentially adjacent pendulum bodies 3 can in this fashion come into contact with one another upon a movement of those pendulum bodies 3. As depicted in FIG. 3 these circumferentially facing first abutment damping members 30 are received in the same window 19 configured in support 2.

(44) As is evident from FIGS. 3 to 5, each first abutment damping member 30 is arranged at least in part in a window 19.

(45) Again according to FIGS. 3 to 5, each first abutment damping member 30 is made in one piece with all or a portion of a second abutment damping member 25. That part is made, for example, of elastomer or rubber.

(46) In the example of FIG. 3 each first abutment damping member 30 extends exclusively inside a window 19.

(47) In the example of FIGS. 4 and 5 each first abutment damping member 30 extends not only inside a window 19, but also axially on either side of that window 19. Each first abutment damping member 30 extends, for example, along a circumferential end 7 or 8 of pendulum body 3.

(48) As is evident from FIG. 5, when each second abutment damping member 25 is in a single piece, one and the same part can constitute both a first abutment damping member 30 and a second abutment damping member 25.

(49) Other examples of devices 1 for damping torsional oscillations according to the invention will now be described with reference to FIGS. 6 to 8. The examples of FIGS. 6 to 8 differ from what has been described with reference to FIGS. 1 to 5 in that each bearing member 11 interacts with two second raceways 13 that are not defined by a connecting member 6. One of these two second raceways 13 is defined by a portion of the periphery of a cavity 35 configured in first pendulum mass 5, while the other of those second raceways 13 is defined by a portion of the periphery of a cavity 35 configured in second pendulum mass 5 of pendulum body 3.

(50) In the example of FIG. 7 each bearing member comprises, axially successively:

(51) a region arranged in a cavity 35 of first pendulum mass 5 and interacting with second raceway 13 constituted by a portion of the periphery of that cavity 35;

(52) a region arranged in a window 19 of support 2 and interacting with first raceway 12 constituted by a portion of the periphery of that window 19; and

(53) a region arranged in a cavity 35 of second pendulum mass 5 and interacting with second raceway 13 constituted by a portion of the periphery of that cavity 35.

(54) Each pendulum body 3 also comprises connecting members 26 pairing the two pendulum masses 5 of that pendulum body 3, but these connecting members 26 are different from the connecting members 6 described with reference to FIGS. 1 to 6. The connecting members 26 here are rivets. Each rivet 26 is equipped, for example, with an abutment damping member 45 visible in FIG. 7, the latter having the shape of a ring made of a material such as elastomer.

(55) In the example of FIG. 6, the rivets 26 are arranged in central zone 10 of a pendulum body 3 and pass through a cavity of support 2 which is different from a window 19. In this example each pendulum body 3 comprises two rivets 26 that are angularly surrounded on each side by a bearing member 11. Similarly to what has been described previously, each window 19 configured in the support receives on the one hand a bearing member 11 guiding the movement of a pendulum body 3, and on the other hand a bearing member 11 guiding the movement of another circumferentially adjacent pendulum body 3.

(56) FIGS. 7 and 8 differ from what has been described with reference to FIG. 6 in that the rivets 26 are also received in windows 19. In other words, and as is evident from FIG. 7, each window 19 configured in support 2 then receives:

(57) a rivet 26 of a pendulum body 3 and a bearing member 11 guiding the movement of that pendulum body 3; and

(58) a rivet 26 of another pendulum body 3 and a bearing member 11 guiding the movement of that other pendulum body 3.

(59) Pendulum bodies 3 are not depicted in their entirety in FIG. 7, one of pendulum bodies 5 of each pendulum body 3 not being depicted in the interest of illustrative clarity.

(60) Although not depicted in FIGS. 6 to 8, device 1 according to those Figures can comprise synchronization members similar to those described with reference to FIGS. 1 and 2, or first abutment damping members similar to those described with reference to FIGS. 3 to 5.

(61) The invention is not limited to the examples that have just been described.