Pendulum damping device

Abstract

A pendulum damping device (1) comprising: - a support (2) rotatable about an axis (X), - at least one pendulum body (3), movable relative to the support (2) and comprising two pendulum masses (5) respectively arranged axially on one side (4) of the support (2), these two pendulum masses (5) being joined together by at least one connecting member (6), and - two rolling members (11) guiding the movement of the pendulum body relative to the support (2), each rolling member (11) cooperating with a first rolling track (12) fixed to the support (2) and with a second rolling track (13) fixed to the pendulum body and defined by the connecting member, characterized in that the two pendulum masses (5) of the pendulum body (3) are circumferentially offset from each other, and in that it comprises a plurality of retaining members (30) carried by the support (2),Each circumferential portion (26) of one of the pendulum masses (5) of the pendulum body (3) extending circumferentially beyond the other pendulum mass (5) of this pendulum body (3) cooperating with one of these retaining members (30), each retaining member (30) being movably mounted on the support (2) with interposition of an elastic return member (31) exerting a radial force, the retaining member (30) and the elastic return member (31) being received in the same opening (40) provided in the support (2) and the elastic return member (31) being configured such that: when the retaining member (30) cooperates with a stop profile (36) of a circumferential portion (26) of a pendulum mass and exerts an outward radial force on this pendulum mass (5) under the effect of the restoring force exerted by said elastic return mechanism (31),This retaining element (30) remains at a distance from the radially outer end (41) of the opening (40). Abbreviated figure: Fig. 4,

Claims

Claims

1. Pendulum damping device (1), comprising: - a support (2) mobile in rotation around an axis (X), - at least one pendular body (3), movable relative to the support (2) and comprising two pendular masses (5) respectively arranged axially on one side (4) of the support (2), these two pendular masses (5) being secured to each other by at least one connecting member (6), and - two rolling members (11) guiding the movement of the pendular body relative to the support (2), each rolling member (11) cooperating with a first rolling track (12) secured to the support (2) and with a second rolling track (13) secured to the pendular body and defined by the connecting member, device characterized in that the two pendular masses (5) of the pendular body (3) are offset relative to each other circumferentially, and by the fact that it comprises a plurality of holding members (30) carried by the support (2), each circumferential portion (26) of one of the pendular masses (5) of the pendular body (3) extending circumferentially beyond the other pendular mass (5) of this pendular body (3) cooperating with one of these holding members (30), each holding member (30) being mounted movably on the support (2) with the interposition of an elastic return member (31) exerting a radial force, the holding member (30) and the elastic return member (31) being received in the same opening (40) provided in the support (2) and the elastic return member (31) being configured so that: when the holding member (30) cooperates with a stop profile (36) of a circumferential portion (26) of a pendulum mass and exerts a radial force towards the outside on this pendulum mass (5) under the effect of the restoring force exerted by said elastic restoring member (31), this holding member (30) remains at a distance from the radially outer end (41) of the opening (40), the pin (34) being made of a material capable of wearing under the effect of the force exerted by the stop profile (36) when the holding member (30) is at a distance from the radially outer end of the opening (40), this material not wearing under the effect of this same force exerted by the stop profile (36) when the holding member (30) is in abutment against this radially outer end (41) of the opening (40).

2. Device according to claim 1, the holding member (30) comprising a pin (34) projecting axially from one side of the support (2) and cooperating with the stop profile (36).

3. Device according to claim 3, the pin (34) being made of polyamide.

4. Device according to any one of the preceding claims, the elastic return member (31) being configured so that, when the holding member (30) cooperates with the stop profile (36) of a circumferential portion (26) of a pendulum mass and exerts via the pin (34) a radial force towards the outside on this pendulum mass (5) under the effect of the return force exerted by said elastic return member (31), this holding member (30) is in abutment against the radially outer end (41) of the opening (40) after wear of a part of the pin (34).

5. Device according to any one of the preceding claims, each holding member (30) comprising two axially opposite pins (34), each pin projecting axially from one side of the support to cooperate with a stop profile (36) of a circumferential portion (26) of a pendulum mass to exert a radial force outwards on this pendulum mass.

6. Device according to any one of the preceding claims, the holding member (30) being made in one piece.

7. Device according to any one of the preceding claims, comprising a base (45) fixed on the support and cooperating with the elastic return member (31) and with the holding member (30), the elastic return member (31) being interposed between this base (45) and the holding member (30), and exerting the radial force outwards with the presence of a radial clearance between the base (45) and the holding member (30).

8. Device according to any one of the preceding claims, being configured so that the sum projected at the center of gravity (M) of the pendulum body (3) of the half radial forces (F1, F2) exerted by the two elastic return members (31), is between 1 and 5 times the weight of this pendulum body.

9. Device according to claim 8, being configured so that the sum projected at the center of gravity of the pendulum body of the half radial forces exerted by the two elastic return members (31) is between 1 and 2 times the weight of this pendulum body.

10. Device according to any one of the preceding claims, the connecting member (6) being unique and comprising a single spacer (7) defining the two second rolling tracks (13) of the pendulum body (3).

11. Device according to any one of the preceding claims, comprising a plurality of pendulum bodies (3), in particular three pendulum bodies, succeeding one another circumferentially around the axis (X) of rotation of the support (2), each circumferential portion (26) of a mass (5) of a pendulum body (3) extending circumferentially beyond the other pendulum mass (5) of this pendulum body (3) having a zone (27) circumferentially overlapping a pendulum mass (5) of a circumferentially neighboring pendulum body (3).

12. Device according to any one of the preceding claims, the support (2) comprising at least one leg (19), in particular two diametrically opposed legs (19), this leg (19) being capable of cooperating with elastic return members for filtering torsional oscillations.

13. Component for a transmission system of a motor vehicle, being a double damping flywheel, and comprising: - the pendulum damping device (1) according to claim 12, and - a plurality of elastic return members for filtering torsional oscillations, the lug (19) interacting with two of these elastic return members.

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