FR3060693A1 - TORSION DAMPING DEVICE - Google Patents

Abstract

Torsion damping device, in particular intended to be integrated in a transmission chain of a motor vehicle, in particular in a clutch, the device comprising: - a support (12); a plurality of oscillating masses (14) arranged around an axis X of rotation of the support, each oscillating mass being guided in oscillation on the support by a single rolling member (16) and respective first and second articulations (24a). , 24b) with first and second circumferentially adjacent oscillating masses (14a, 14b), respectively, the device being characterized in that it comprises a built-in mass-bearing stop (30) - an oscillating weight or - a part d articulation interposed between an oscillating mass and an oscillating mass circumferentially adjacent to said oscillating mass, and arranged so as to limit the displacement of said oscillating mass, called the "associated oscillating weight", relative to the support.

Description

Technical area

The invention relates to a torsion damping device, in particular for a clutch of a motor vehicle.

State of the art

A torsion damping device is conventionally used to filter vibrations due to acyclic movements of the engine. It can in particular be integrated into a clutch, a hydrodynamic torque converter or a dry or wet double clutch.

Conventionally, it comprises a support, sometimes called a "phasing washer", intended to be driven in rotation, and several pendulum oscillating masses, mounted oscillating on the support around an axis parallel to the axis of rotation of the support, the displacement of an oscillating mass with respect to the support being generally guided by two rolling members cooperating with rolling tracks of the support and rolling tracks of the oscillating mass.

FR3013415 A1 describes a torsion damping device in which the movement of each oscillating mass is guided by a single rolling member and by an articulation with the two circumferentially adjacent oscillating masses. This torsional damping device advantageously combines great simplicity of construction, close to that of a single-wire pendulum device, and damping performance close to that of a two-wire pendulum device.

However, the torsion damping device described in FR3013415 A1 has limited mechanical strength, in particular under the effect of strong shocks.

There is a need to solve, at least partially, this problem.

An object of the invention is to meet this need.

Summary of the invention

To this end, the invention provides a device for damping torsion, in particular intended to be integrated in a transmission chain of a motor vehicle, in particular in a clutch, the device comprising:

a support ;

a plurality of oscillating masses arranged around an axis X of rotation of the support, each oscillating mass being guided in oscillation on the support by a single respective rolling member and by first and second articulations with first and second circumferentially adjacent oscillating masses , respectively.

Remarkably, a torsion damping device according to the invention comprises a mass-support stop integrated (a) with an oscillating mass or (b) with an articulation piece interposed between an oscillating mass and a circumferentially adjacent oscillating mass to said oscillating mass, the mass-support stop being arranged so as to limit the displacement of said oscillating mass, called "associated oscillating mass", with respect to the support.

The expression "associated oscillating mass" is used for clarity, to designate an oscillating mass whose displacement is limited by the mass-support stop. The associated oscillating mass can therefore be an oscillating mass integrating the mass-support stop (case (a)) or an articulated oscillating mass with a circumferentially adjacent oscillating mass (case (b)) by means of an articulation piece integrating the mass-support stop.

The expression "adjacent oscillating mass" (or "circumferentially adjacent oscillating mass") is used to denote an oscillating mass which is articulated on the associated oscillating mass considered.

The inventors have discovered that the presence of such a mass-support stop increases the life of the torsion damping device, in particular when it is exposed to violent shocks. Without being limited by this theory, the inventors explain these results by reducing the intensity of the shocks transmitted by the oscillating mass to the support, especially at the end of the course when the device saturates.

A device according to the invention can also include one or more of the following optional characteristics:

each oscillating mass of the device is associated with a respective mass-support stop, limiting its movement relative to the support; the stop mas se-support is radial and / or circumferential;

the mass-support stop is rigidly fixed to first and second weights of the associated oscillating mass, the first and second weights preferably extending on either side of the support (that is to say opposite the first and second large faces of the support), respectively;

the mass-support stop is an added piece, for example a rivet, rigidly joining the first and second weights of the associated oscillating mass, said first and second weights preferably extending on either side of the support, respectively;

the mass-support stop came in one piece with a counterweight of the associated oscillating mass, preferably a semi-cut is obtained; the mass-support stop is integrated into the associated oscillating mass and is configured to come into abutment with an oscillating mass circumferentially adjacent to the associated oscillating mass;

the mass-support stop is a male part or a female part of a joint guiding a rotation of the associated oscillating mass with respect to an adjacent oscillating mass, in a plane perpendicular to the axis X;

the mass-support stop is shaped to come into abutment with a radially outer edge of the support;

the mass-support stop is disposed less than 3 cm, preferably less than 1 cm from a circumferential end of the associated oscillating mass; the device comprises first and second stops capable of limiting the displacement of the associated oscillating mass relative to the support, the first stop being made of an elastomeric material and the second stop being made of a metal and being arranged so as to come into abutment with the support after the first stop has come into abutment, at least one of said first and second stops, preferably each of said first and second stops forming a said mass-support stop.

The pendulum masses comprise a first counterweight and a second counterweight arranged axially on either side of a support in one piece.

- The running gear cooperates with two running tracks defined by the first and second parts of each pendulum mass.

- The running gear cooperates with a single running track defined by a spacer which connects the flyweights.

- The support comprises two axially spaced parts and between which the pendulum masses are arranged. Each rolling member cooperates with a single rolling track defined by the mass and with two rolling tracks defined by the parts of the support.

The torsion damping device according to the invention is preferably chosen from a double damping flywheel, a hydrodynamic torque converter and a friction disc.

The invention also relates to a motor vehicle equipped with a torsion damping device according to the invention.

Brief description of the figures

Other characteristics and advantages of the invention will become apparent on reading the detailed description and on examining the appended drawing in which FIGS. 1 to 8 schematically represent different embodiments of a damping device for torsion according to the invention.

In the various figures, identical references are used to designate identical or analogous members.

The views are front views, except for Figures 6b, 6c, 7a, 7d and 8a, which are in perspective, and for Figures 4b and 6d, which are sections along the planes P2 and P3 of Figures 4a and 6c , respectively.

In Figure 6c, one of the weights has been removed, for clarity.

Definitions

Unless otherwise stated,

- axially means parallel to the axis X of rotation of the support,

- Radially means along a transverse axis intersecting the axis of rotation of the support;

- transverse means in a plane perpendicular to the axis of rotation of the support,

- angularly or circumferentially mean around the axis of rotation of the support,

- orthoradialement means perpendicular to a radial direction and in a transverse plane.

By radial plane is meant a plane containing a radial axis and the X axis.

By axial plane is meant a plane containing the X axis.

By radial offset, reference is made to the positions of two members which are not at the same distance from the X axis.

The diameter of a section is equivalent to the diameter of a disc having the same surface as said section. When the section is discoidal, the equivalent diameter is therefore equal to the diameter of the section.

The rest position of an oscillating mass is the position adopted by the oscillating mass when it is subjected to a centrifugal force resulting from the rotation of the support, without being subjected to torsional oscillations coming from acyclisms of the heat engine. Except in FIG. 7c and 8c, the oscillating masses shown are in their rest positions.

The thickness of a part refers to a dimension measured along the X axis.

By motor vehicle is meant not only passenger vehicles, but also industrial vehicles, which notably includes heavy goods vehicles, public transport vehicles or agricultural vehicles.

By "articulation" between two adjacent oscillating masses is meant a connection allowing rotation of one of these oscillating masses relative to the other, about an axis parallel to the axis X of the support. A "joint" is not incompatible with a slip between said oscillating masses. A joint can be obtained by cooperation of male and female parts of said adjacent oscillating masses or by means of a joint, interposed between said adjacent masses.

By “oscillating mass” is meant a mass which is mounted so as to oscillate on the support in response to acyclisms in the vehicle engine. An oscillating mass is conventionally constituted by a pair of weights, extending so as to sandwich the support and rigidly joined together. An oscillating mass can also be constituted by a single counterweight.

Two pieces are said to be "rigidly secured" when they are permanently immobilized with respect to one another. This immobilization can result from a fixing of the first part on the second part directly or through one or more intermediate parts.

Unless otherwise indicated, the verbs to include, present or understand must be interpreted broadly, that is to say without limitation.

detailed description

As shown in the figures, a torsion damping device 10 according to the invention comprises a support 12 able to move in rotation around an axis X and a plurality of oscillating masses 14 movable relative to the support 10.

The support 12 has a generally planar, annular or multilobed shape, for example three-lobed, as in FIGS. 4 and 5.

The oscillating masses are preferably distributed equiangularly around the axis X. Preferably, their number is greater than 2 and / or less than 8. The device can in particular comprise three, five or seven oscillating masses. In the examples shown, the device comprises three oscillating masses uniformly distributed around the X axis.

Each oscillating mass 14 conventionally comprises first and second weights 14i and 142, of generally planar shape, extending respectively opposite the first and second large faces of the support 12.

Each oscillating mass is pivotally mounted on the support, by means of a single rolling member 16, preferably a roller, which passes through a rolling window 18 (artificially visible in the figures by transparency of the oscillating mass) formed in the thickness of the support. Conventionally, the rolling member cooperates on the one hand with a rolling track defining the inner contour of the rolling window of the support and, on the other hand, with a rolling track 19 defined by the oscillating mass.

The first and second weights 14i and 142 are rigidly fixed to each other, preferably by means of rivets, preferably by means of a spacer 20 (which belongs to the oscillating mass), which defines a track bearing 19 and which passes through the bearing window of the support.

In the example of Figure 8, the pendulum bodies do not have a spacer defining the raceway. The running member 16 always cooperates with a running track 19 of the support but with two running tracks 19, each defined by the outline of an opening of one of the weights 14.

Each oscillating mass 14 is articulated, at its first and second circumferential end portions 22a and 22b, respectively, on first and second oscillating masses 14a and 14b, respectively, circumferentially adjacent to the oscillating mass 14. The first and second corresponding articulations, 24a and 24b respectively, are shaped so as to allow rotation of the oscillating mass 14 only in a transverse plane. Each articulation 24 (24a, 24b) has a male part 26 and a female part 28.

The male part and / or the female part of a joint 24 (which each belong to a respective oscillating mass) may have come integrally with a counterweight of a respective oscillating mass. They can also be constituted by parts fixed on the weights. In particular, the female part 28 can be an articulation fork 46 fixed on a counterweight. In one embodiment, the articulation fork 46 is for example fixed on the large face of a counterweight which is opposite to the support.

In a preferred embodiment, illustrated in FIG. 8, in FIG. 7, in FIG. 3, the articulation fork extends in sandwich between the two weights 14i and 14 ₂ , preferably in the plane of the support 12 More preferably, one or more rivets 48 ensure rigid assembly of the articulation fork 46 (artificially visible in the figures, by transparency of the oscillating mass) and of the two flyweights 141 and 14 ₂ .

Preferably, the articulation fork 46 is fixed by at least two rivets 48 on one, preferably on the two weights of the oscillating weight. Advantageously, any risk of rotation of the articulation fork 46 relative to the counterweights is eliminated.

The male part 26 of a hinge 24 can be made integrally with a counterweight, as shown in FIGS. 1, 2, and 4 to 8.

The male part can also be formed by an attached articulation finger 50. Like the articulation fork 46, the articulation finger 50 can be fixed on a counterweight. In a preferred embodiment, illustrated in FIG. 7, the articulation finger 50 of an oscillating mass 14 extends in sandwich between the two weights 14i and 14 ₂ , preferably in the plane of the support 12.

Preferably, the articulation finger 50 is fixed by at least two rivets 49 on one, preferably on the two weights of the oscillating weight. Advantageously, any risk of rotation of the articulation finger 50 relative to the weights is eliminated. In the example of rolling described in FIG. 8, these rivets 49 also make it possible to link the weights together and therefore to dispense with a spacer as described with reference to the other figures.

The characteristics of the torsion damping device described in French patent application n ° 1554281 filed on May 12, 2015 can be applied to a torsion damping device according to the invention, in particular for producing the joints 24.

In the torsion damping device described in this document, the oscillation movement of an oscillating mass 14 is limited by the stop between the rolling member 16 and the edge of the rolling window 18.

According to the present invention, the torsion damping device comprises a mass-support stop 30, that is to say capable of limiting the displacement of an associated oscillating mass 14 by a contact on the support, the mass-stop support 30 being integrated into the oscillating mass or an articulation piece. The mass-support stop is therefore not the running gear.

By “integrated into the oscillating mass or to an articulation part”, it is meant that the mass-support stop belongs to the oscillating mass or to the articulation part, and that it forms, with at least part of the oscillating mass or articulation piece, a rigid assembly. In particular, it may consist of a region of a counterweight or of the articulation piece.

In the embodiments shown, the pendulums, each consisting of an oscillating mass 14 and a rolling member 16, are all identical and assembled identically to the support 12. In the following description, only one of these pendulums is therefore described.

The mass-support stop 30 is preferably rigidly secured to the associated oscillating mass 14.

Alternatively, the mass-support stop is not rigidly secured to the associated oscillating mass, but is rigidly secured to a hinge piece interposed between the associated oscillating mass and a circumferentially adjacent oscillating mass.

A mass-support stop 30 preferably extends along an axis Y, preferably parallel to the axis X. It can come into abutment with the edge of a stop window 38 formed through the support 12 (artificially visible on the figures, by transparency of the oscillating masses), as in the embodiments of Figures 1 to 3 and 5 to 8. Alternatively, the mass-support stop can be configured to come into abutment with a radially outer edge 42 of the support (artificially visible in the figures by transparency of the oscillating mass), as shown in Figures 4, 7 and 8.

The surface of the support coming into contact with the mass-support stop 30 can also be defined by a pad of material 43, for example by a semi-cut made in the support 12, as shown in FIG. 6.

The mass-support stop 30 may be radial and / or circumferential, that is to say capable of limiting the displacement of the oscillating mass in a radial and / or circumferential direction, respectively.

The mass-support stop can be an insert, in particular a rivet rigidly joining the two weights, or can be obtained by deformation of material, in particular, by semi-cutting.

In a particularly advantageous embodiment, the mass-support stop 30 rigidly connects the first and second weights 141 and 142 of the associated oscillating mass 14. Its two ends are preferably riveted on the first and second weights, respectively. Advantageously, the mass-support stop 30 thus participates in the mechanical cohesion of the associated oscillating mass 14.

In the embodiments of FIGS. 1 to 3, the mass-support stop 30 passes through the stop window 38.

The number of mass-support stops 30 associated with an oscillating mass 14 is not limited. In particular, the number of mass-support stops 30 can be equal to 1 (FIG. 1) or 2 (references 30i and 302 in FIG. 2)).

Preferably, the mass-support stops 30i and 3Ο2 are arranged in a substantially symmetrical manner relative to the median radial plane Pi of the spacer 20. The balancing of the pendulum is improved.

More preferably, each mass-support stop 30 associated with an oscillating mass 14 is arranged less than 10 cm, less than 5 cm, less than 3 cm, less than 2 cm, or even less than 1 cm from the first or the second circumferential end, referenced 44a and 44b, respectively, of the associated oscillating mass 14. As shown in FIGS. 4 to 6, a mass-support stop 30 may in particular be arranged at the end of the male part 26 of an articulation 24. The mechanical resistance of the associated oscillating mass is improved.

In a preferred embodiment, the female part of a joint 24, and in particular an added articulation fork 46 and / or the male part 26, and in particular an attached articulation finger 50, constitute a mass stop. support 30. For example, in the embodiment of FIG. 3, the mass-support stop 30 of the associated oscillating mass 14 also acts as a male part for the articulation 24b, by cooperating with the rigidly fixed articulation fork 46b on the adjacent oscillating mass 14b.

In this embodiment, the mass-support stop 30 therefore performs three functions: rigid attachment of the two weights of the associated oscillating mass 14, limitation of the displacement of the associated oscillating mass 14 relative to the support 12 and male part of a joint 24.

In FIG. 4, the mass-support stop 30 also exercises this triple function.

It is the same for the articulation forks 46 and the articulation fingers 50, which each constitute a mass-support stop 30, in the embodiment of FIG. 7.

The ability for a mass-support stop 30 to provide both a stop function with an oscillating mass circumferentially adjacent to the associated oscillating mass and with the support is in particular possible when the mass-support stop 30 is fixed on the male part of a joint.

The mass-support stop 30 can be configured to ensure hard or soft contact, the stop being then said to be “hard” or “soft”. A hard stop is obtained when the contact between the support 12 and the mass-support stop 30 is made by means of a substantially non-deformable region, conventionally made of metal, and in particular steel. A soft stop is obtained when the contact between the support 12 and the mass-support stop 30 is made through a deformable region, conventionally made of an elastomeric material.

In the embodiments of Figures 1 to 3, the mass-support stop 30 is a hard stop.

In the embodiments of the other figures, the mass-support stop 30 is soft. Preferably, the mass-support stop 30 comprises an elastomer block 52.

The elastomer block can also be fixed on the mass-support stop 30, for example riveted, glued or molded on the mass-support stop.

Preferably, the elastomer block is removable.

In one embodiment, as in FIG. 4, the mass-support stop 30 comprises a rigid core 54, for example made of steel, preferably in the form of a pin rigidly connecting the two weights, and at least one block made of elastomer 52, preferably in the form of a tube made of a polymer material threaded onto the core 54.

The elastomer block ensuring the soft stop is not necessarily fixed on the core of the mass-support stop 30. H can also be fixed on the associated oscillating mass, as in the embodiment of FIG. 7, or on a hinge piece interposed between the associated oscillating mass and an adjacent oscillating mass. In the embodiment of FIG. 7, the elastomer block 52 thus comprises lugs 541 and 542, which extend substantially axially, and penetrate into corresponding housings 56i and 502, for example through holes, formed on the counterweights 14i and 142, respectively.

Preferably, a torsion damping device according to the invention comprises, to limit the movement of the oscillating mass 14 relative to the support 12, at least one soft stop and one rigid stop, preferably configured so that activation of the rigid stop is necessarily posterior to the activation of the soft stop. At least one of these stops, preferably each of these stops, is a mass-support stop 30.

The presence of a hard stop advantageously limits the deformation of the elastomer block beyond its elastic limit.

For example, in the embodiment of Figures 1 to 3, a first stop is provided by elastomer blocks 56, belonging to the spacer 20 and coming into contact with the lateral edges 58 of the rolling window 18. As explained above , a second hard stop is provided by the contact between the mass-support stop 30 and the edge of the corresponding stop window 38. The two stops are configured so that the activation of the first stop, ensuring a soft contact, precedes the activation of the second stop, ensuring a hard contact. For low intensity shocks, only the soft stop is activated. During violent impacts, the soft stop is activated and the elastomer block deforms, then the hard stop 30 is activated.

In one embodiment, as shown in Figure 4, the two stops are soft. It is the same in the embodiment of Figures 6, 7 and 8.

In one embodiment, the mass-support stop 30 provides both a stop with an adjacent oscillating mass and a stop with the support.

In one embodiment, the mass-support stop 30 may comprise a core capable of coming into hard contact with the support 12 and one or more elastomer blocks capable of coming into soft contact with an adjacent oscillating mass.

The embodiment of FIGS. 7 and 8 illustrates an embodiment in which the abutment mas-support 30i, in the form of an articulation finger 50 and an elastomer block 52i, first ensures contact soft with the support 12, by contact with the elastomer block 52 μ and then a hard contact, by contact with the articulation finger 50, the elastomer block 52i and the articulation finger 50 successively coming into abutment on the contact zones 421 and 42 ₂ of the support 12, respectively.

In this embodiment, the assembly constituted by the articulation fork 46 and by the elastomer block 52 ₂ also constitutes a mass-support stop 30 ₂ ensuring a soft contact with the support 12, by contact with the elastomer block 52 ₂ , then a hard contact, by contact with the articulation fork 46, the elastomer block 522 and the articulation fork 46 successively coming into abutment on the contact zones 42-, and 424.

As is now clearly apparent, the invention provides a solution for limiting the shocks transmitted, by means of the single rolling member, to the oscillating mass associated with the mass-support stop.

As is now clearly apparent, the invention provides a solution for limiting the shocks transmitted by the spacer or by the members for fixing the weights to each other to the support, especially at the end of the course when the device saturates.

The impact resistance of the associated oscillating mass, and therefore the life of the torsion damping device, is improved.

Of course, the combinations of the various embodiments described above are possible.

Claims (12)

1. A torsion damping device, in particular intended to be integrated in a transmission chain of a motor vehicle, in particular in a clutch, the device comprising: - a support (12); - a plurality of oscillating masses (14) arranged around an axis X of rotation of the support, each oscillating mass being guided in oscillation on the support by a single respective rolling member (16) and by first and second articulations (24a , 24b) with first and second circumferentially adjacent oscillating masses (14a, 14b), respectively, the device being characterized in that it comprises an integrated mass-support stop (30) - an oscillating mass or - a hinge piece interposed between an oscillating mass and an oscillating mass circumferentially adjacent to said oscillating mass, and arranged so as to limit the displacement of said oscillating mass, called "associated oscillating mass", with respect to the support. 2. Device according to the preceding claim, wherein the mass-support stop (30) is radial and / or circumferential. 3. Device according to any one of the preceding claims, in which the mass-support stop (45) is rigidly fixed to two weights (14i, 142) of the associated oscillating mass (14) extending on either side. support, respectively. 4. Device according to any one of the preceding claims, in which the mass-support stop has come integrally with a counterweight of the associated oscillating mass. 5. Device according to any one of the preceding claims, in which the mass-support stop is integrated into the associated oscillating mass (14) and is configured to come into abutment with an oscillating mass circumferentially adjacent (14a, 14b) to the mass. associated oscillating. 6. Device according to any one of the preceding claims, in which the mass-support stop is a male part (50) or a female part (46) of a joint guiding a rotation of the associated oscillating mass (14) with respect to to an oscillating mass circumferentially adjacent (14a, 14b) to the associated oscillating mass, in a plane perpendicular to the axis X. 7. Device according to any one of the preceding claims, in which the mass-support stop is shaped to come into abutment with a radially outer edge (42) of the support. 8. Device according to any one of the preceding claims, in which the mass-support stop (30) is arranged within 3 cm from a circumferential end (44a, 44b) of the associated oscillating mass (14). 9. Device according to any one of the preceding claims, in which the mass-support stop (30) is arranged within 1 cm from a circumferential end (44a, 44b) of the associated oscillating mass (14). 10. Device according to any one of the preceding claims, comprising first and second stops capable of limiting the displacement of the associated oscillating mass relative to the support, the first stop (56) being made of an elastomeric material and the second stop ( 46.50) being made of a metal and being arranged so as to come into abutment with the support (12) after the abutment of the first abutment, at least one of said first and second abutments forming said abutment massesupport. 11. A torsion damping device according to any one of the preceding claims, chosen from a double damping flywheel, a hydrodynamic torque converter and a friction disc. 12. Motor vehicle equipped with a torsion damping device according to any one of the preceding claims. 1/8 44a