FR3073591A1 - PENDULAR DAMPING DEVICE WITH ROLLER BEARING - Google Patents

Abstract

Pendulum damping device intended to be integrated in a transmission chain of a motor vehicle, comprising: - a support (20) having an axis of rotation X, and in which a window (22) defining a support rolling track (21) is provided, - an oscillating mass (11) comprising: - first and second flyweights (24), - a spacer (14) matching said flyweights and defining a rolling track of oscillating weight (23), a member of bearing (12) defining a running surface (25) on the bearing and oscillating weight bearing tracks so as to guide oscillation of the oscillating mass relative to the support, the oscillating mass comprising a plating member (16) compressed elastically, regardless of the position of the oscillating mass relative to the support, between the spacer and / or a counterweight on the one hand and the rolling member on the other.

Description

PENDULAR DAMPING DEVICE WITH PLACEMENT OF THE BEARINGS

Technical area

The present invention relates to a pendulum damping device, in particular for a clutch of a motor vehicle transmission system.

State of the art

A pendulum damping device is conventionally used to filter vibrations due to acyclisms in the engine of a motor vehicle. Indeed, the movements of the cylinders of an internal combustion engine generate acyclisms which vary in particular according to the number of cylinders. These acyclisms are capable of generating in turn vibrations which can pass into the gearbox and cause shocks and undesirable noise pollution. It is therefore preferable to provide a vibration filtration device.

The pendulum damping device is conventionally rigidly fixed, by means of rivets, to a phasing washer of a torsion damping device, in particular to a clutch, a hydrodynamic torque converter or a double wet or dry clutch. . Such a torsional damping device is for example known as a double damping flywheel.

Conventionally, the pendulum damping device comprises an annular support 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 movement of an oscillating mass relative to the support is generally guided by two rolling members each cooperating with a rolling track of the support and a rolling track of the oscillating mass. The rolling tracks of the support and of oscillating mass extend so that in service the rolling members are in centrifugal and centripetal support, respectively, on said tracks.

An oscillating weight is conventionally constituted by a pair of weights, sandwiching the support and rigidly joined together, generally by means of a spacer. The spacer can define the running track of the oscillating weight.

When the pendulum damping device rotates at reduced speed, typically at less than 800 revolutions / min, in particular when starting, when the vehicle is slowing down, when the engine is stopped or when changing gear ratio, the centrifugal force exerted on the oscillating masses is reduced and the latter therefore tend to approach the axis of rotation. The contact of the running gear with the running tracks can thus be interrupted, which leads to undesirable noise and to shocks likely to reduce the service life of the pendulum damping device. In particular, the running gear is a major source of unwanted noise.

H is known from application FR 3 046 649 in the name of the Applicant a pendulum damping device comprising a spring limiting the movements of the oscillating mass in the radial direction during a slowdown in the rotation of the pendulum damping device. This solution is not entirely satisfactory.

The object of the invention is therefore to provide a more efficient solution for reducing shock and unwanted noise.

Summary of the invention

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

a support having an axis of rotation X, and in which a window defining a support raceway is provided,

- an oscillating mass defining an oscillating mass rolling track and comprising:

- first and second weights,

- a spacer matching said weights,

a rolling member defining a rolling surface on the support and oscillating mass tracks, so as to guide an oscillation of the oscillating mass relative to the support, the oscillating mass comprising an elastically compressed plating member, whatever either the position of the oscillating mass relative to the support, either between the spacer and / or a counterweight or the support on the one hand and the rolling member on the other hand, or between the spacer on the one hand and a counterweight and the rolling member on the other hand.

Thus and as will be seen in more detail in the following description, the rolling member is pressed against the support even when the latter is rotating at a low or zero speed. The movement of the rolling member in a radial direction is thus strongly constrained and shocks between the rolling member and the support or the oscillating mass, sources of noise pollution, are avoided. The inventors have discovered that plating the running gear is more effective than plating the oscillating weight on the support. This pressing of the rolling member against the support is carried out by means of permanent contact, direct or indirect, between at least part of the rolling member and at least part of the plating member.

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

- The plating member is supported on the spacer;

- The plating member is a leaf spring at least partially curved around an axis parallel to the X axis;

- The spacer and / or the rolling member comprises a housing, preferably a spacer groove, preferably extending in a plane perpendicular to the axis X, and shaped to receive, preferably completely, the plating member, preferably in the form of a leaf spring, in a retracted position;

- The plating member comprises one or more lateral protuberances received in one or more respective recesses formed on the first and / or the second oscillating mass;

- The oscillating mass rolling track is defined by the spacer and / or the plating member;

- The track of oscillating mass is defined by the spacer and / or the plating member, the plating member may or may not have an opening through which the rolling member bears on the spacer;

- The plating member has an opening through which the rolling member bears on the spacer;

- The rolling member has a diameter, in the area of contact with the plating member, less than its diameter in the area of support with the spacer;

- The rolling member has an axial end, preferably a pin, guided by an edge of a buttonhole formed in one of the weights, the plating member being at least partially interposed between the axial end and the edge.

The invention also relates to a component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter or a friction clutch disc, comprising a pendular damping device according to the invention.

Another subject of the invention, according to another of its aspects, is a vehicle powertrain comprising:

- a vehicle propulsion thermal engine, and

- a component for a transmission system according to the invention.

Brief description of the figures

Other characteristics and advantages of the invention will become apparent on reading the description which follows and on examining the appended drawings in which:

- Figure 1 shows a part of a torsion damping device;

- Figures 2a and 2b show a first embodiment of the invention, the rolling member being pressed against the support by the plating member;

- Figures 3a and 3b show the same embodiment as that shown in Figures 2a and 2b, the rolling member not being pressed against the support by the plating member;

- Figures 4a and 4b show a second embodiment of the invention;

- Figures 5a and 5b show a variant of this second embodiment;

- Figures 6 to 8 illustrate different embodiments of the invention.

For each of FIGS. 2 to 5 and 7, the figure marked "a" represents the rolling member within the window of the support and the figure marked "b" more particularly represents the plating member.

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

Definitions

The plating member is said to be "integral" with the oscillating mass or the support when it cannot be detached from it. It can be rigidly fixed on the oscillating mass or the support, or be movable mounted on the oscillating mass or the support.

"Elastic support" generates pressure from one part to another, unlike a simple contact, the elasticity allowing a modification of this pressure by relative displacement of these two parts.

Unless otherwise indicated, "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" means "around the axis of rotation of the support".

By "transverse plane" means a plane perpendicular to the axis of rotation of the support.

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

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

A "radius" is a line formed by the intersection of a transverse plane and a radial plane.

The thickness is measured along the X axis.

"Centrifugal support" means a support force comprising a component oriented away from the X axis.

By "centripetal support" is meant a support force comprising a component oriented towards the X axis.

"Motor vehicle" means not only passenger vehicles, but also industrial vehicles, which includes heavy goods vehicles, public transport vehicles or agricultural vehicles.

By “oscillating mass”, or “pendulum body”, is meant a mass which is mounted so as to oscillate on the support in response to acyclisms of the vehicle engine. An oscillating mass is conventionally constituted by a pair of weights, or "pendulum masses", 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 attached" or "paired" when they are permanently immobilized relative to one another. This immobilization can result from a fixing of the first part on the second part directly or by means of one or more intermediate parts.

The rest position of the device is that in which the oscillating masses are subjected to a centrifugal force, but not to torsional oscillations originating from the acyclisms of the heat engine.

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

detailed description

FIG. 1 shows a pendulum damping device 10. The pendulum damping device 10 comprises at least one oscillating mass 11 and a support 20 of axis X in the thickness of which are formed at least two windows 22.

The support is conventionally constituted by a cut metal sheet, generally made of steel, of a thickness typically less than 10 mm, preferably less than 9 mm, preferably less than 8 mm.

Preferably, the pendulum damper device 10 comprises a plurality of oscillating masses 11. 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 example considered, each oscillating mass comprises two weights 24 and two connecting members matching the two weights. Each connecting member, also called "spacer" 14, secures the weights through a respective window 22 of the support. In other words, the spacer is sandwiched between the two weights and extends into the window of the support 20. It is possible that the spacer also extends into a window of the weights.

Additional members, such as damping buffers and / or stops and / or guides for damping and / or limiting and / or guiding the oscillation movement of the oscillating masses, for example made of polymer, can be fixed to the spacer.

The oscillating mass is conventionally mounted oscillating on the support by means of two rolling members 12, preferably rollers, which each pass through a respective window 22 of the support and guide the movement of the oscillating mass relative to the support.

20. In the examples considered, a window 22 receives only a single rolling member 12.

Each rolling member 12 has a longitudinal axis Y parallel to the axis of rotation X of the support 20. The radially outer surface of the rolling member 12, or “rolling surface” 25, cylindrical with axis Y, can roll alternately on a track of the support 21 and on a track of oscillating mass 23 during oscillations of the oscillating mass.

The running gear can for example be made of steel.

The support raceway is preferably defined by the internal contour of the window 22 of the support and the oscillating mass raceway is preferably defined by the spacer of the oscillating mass.

The oscillating mass comprises, for each rolling member, a plating member 16 compressed elastically between a spacer and the rolling member 12, whatever the position of the oscillating mass relative to the support.

The spacer and / or the plating member define the oscillating mass raceway.

According to the invention, as shown in FIG. 2a, the plating member 16 presses the rolling member 12 against the support at least when the centrifugal force exerted by the rotation of the support is not sufficient to hold the member of bearing in centrifugal support against the support. Conventionally, this is the case when the speed of rotation of the support is less than a speed of the order of 800 revolutions / min.

As detailed in FIG. 2b, the plating member 16 may be a leaf spring, preferably fixed to the spacer by hooks located at its ends. In this embodiment, the spacer preferably comprises a housing 15 extending along the track of oscillating mass and able preferably to fully accept the leaf spring in a retracted position.

Alternatively, the rolling member can comprise a housing extending along the rolling surface and which can preferably accept respectively at least a portion of the leaf spring.

The leaf spring is advantageously made of alloy steel for a spring or another elastic material.

When the speed of rotation of the support is sufficiently high, the rolling member is in contact, under the effect of centrifugal force, with both the support raceway and the oscillating mass raceway, as illustrated in Figures 3a and 3b. The plating member is then held resiliently in the housing 15 of the spacer, as shown in FIG. 3b. Indeed, the elasticity of the plating member is such that at a sufficient speed of rotation, the plating member does not provide sufficient resistance to prevent contact, by centrifugal support, between the rolling member and the spacer.

When the speed of rotation decreases, the effect of the centrifugal force on the oscillating mass is reduced and the latter approaches the X axis, as shown in Figures 2a and 2b. The compression of the plating member also decreases and the latter partially leaves the housing 15, while remaining in contact with the rolling member. The rolling member therefore remains in abutment on the support and on the oscillating mass, which prevents shocks.

Alternatively, the plating member 16 is composed of two elastic blades. The two elastic blades are preferably separated and can each be fixed to the spacer by hooks located at their ends. In this embodiment, the spacer preferably comprises two housings 15 extending along the rolling track of oscillating mass and which can preferably accept one of the leaf springs respectively in a retracted position. Alternatively, the rolling member can comprise two housings extending along the rolling surface and which can preferably accept respectively at least a portion of one of the leaf springs.

Alternatively, the plating member 16 is compressed elastically between the rolling member 12 and the support 20, whatever the position of the oscillating mass relative to the support.

In a second embodiment shown in Figures 4a and 4b, the plating member is an elastic strip. In the rest position, the oscillating weight raceway is, in this mode, defined by the strap, and not by the spacer. As illustrated in FIG. 4b, the strip can advantageously include lateral protuberances 17 which, in the rest position, are held in respective recesses made on the counterweights. In this embodiment, the spacer also extends into the recesses in the counterweights. The plating member may include six lateral protuberances 17 distributed uniformly over two of the lateral edges of the strip. The lateral protuberances 17 are, for example, opposite two by two.

Thus, the lateral protuberances 17 form tabs for retaining the strip on the oscillating mass. Such a configuration is particularly advantageous for simplifying the mounting of the device.

It is also conceivable that the lateral protuberances 17 are maintained in respective recesses formed on Γ spacer.

The strip is advantageously made of alloy steel for spring, preferably of a thickness between 0.1 mm and 0.5 mm. This thickness is measured along an axis Z, perpendicular to the axis X.

Another variant of this embodiment is illustrated in Figures 5a and 5b. In this variant, the plating member is a strip extending in a direction perpendicular to the axis X between two ends. The strip has at each of these ends two lateral protuberances opposite one another. A remarkable feature of the strip shown in Figure 5b is its curved shape, while the strip shown in Figure 4b is flat. This camber makes it possible to standardize, whatever the angular position of the rolling member with respect to the spacer, the resistance of the plating member to the centrifugal support of the spacer on the rolling member. The impact of the plating member on the filtration function of the vibration frequencies of the pendulum damping device is thus reduced.

The curved shape, around an axis parallel to the X axis, also avoids excessive forces on the plating member, which can generate plastic deformations and thus its premature wear.

The number of lateral growths is not limiting. It is for example conceivable to provide only a single lateral protuberance on each side of the plating member in order to reduce the stresses due to their presence or even to provide only one lateral protrusion on one side of the plating member.

Another variant of this embodiment is represented in FIG. 6. The strip comprises, in this variant, an opening 19 through which the rolling member is in direct contact with the spacer when the speed of rotation of the support is sufficiently high.

In order for the strip to perform its function of plating the rolling member, the rolling member has a diameter, in the area of contact with the plating member, less than its diameter in the area of contact with the spacer. As in the example illustrated in FIG. 6, this geometry can be obtained by machining the circumference of the planar faces of a roller.

According to this variant, the plating member has no appreciable influence on the rolling of the rolling member and a separation is thus made between the plating function and the rolling function.

This variant also has the advantage of allowing axial stabilization of the rolling member, the latter being constrained in its orientation by the inner edges of the opening 19.

Another embodiment of the invention is shown in FIG. 7a. In this mode, a buttonhole 26 is formed in a counterweight 24 and the plating member 16 consists of a strip having a single lateral projection 17, as shown in FIG. 7b. A second lateral protuberance opposite this first lateral protuberance 17 is conceivable.

In the embodiment as shown in FIG. 7a, the spacer is sandwiched between the weights and therefore does not extend into a recess in the weights. Consequently, the lateral projection 17 cannot be inserted in a recess in which the spacer would extend, as is the case for the embodiments of FIGS. 4 to

6. The lateral protuberance 17 is thus inserted into the buttonhole 26, which stabilizes the plating member. In addition, the plating member defines the rolling track of the oscillating mass.

Preferably, the buttonhole 26 is also shaped to receive and guide an axial end 13 of the rolling member, preferably a pin, which limits the movements of the rolling member relative to the oscillating mass.

In the context of the invention, the plating member is not necessarily supported on the spacer. As shown in FIG. 8, the counterweights 24 may in particular comprise respective buttonholes 28 in each of which an axial end 13 of a rolling member is slidably mounted. The cladding member 16, preferably a leaf spring, is resiliently mounted between the edge of the buttonhole 28 and the axial end 13 of the rolling member which slides therein. The plating function is then carried out by the action of the leaf spring 16 on an axial end 13, preferably a pin, of the rolling member.

Of course, the invention is not limited to the embodiments described and shown, provided for illustrative purposes only. In particular, the geometry of the plating member is not limited. The different embodiments could also be combined.

The shape of the oscillating masses is also not limiting.

The number of rolling elements, and in particular the number of rolling elements extending in the same window of the support, is not limiting either.

Claims (11)

1. A pendulum damping device intended to be integrated in a transmission chain of a motor vehicle, in particular in a clutch, comprising: a support (20) having an axis of rotation X, and in which a window (22) defining a support rolling track (21) is provided, - an oscillating mass (11) defining an oscillating mass rolling track (23) and comprising: first and second flyweights (24), a spacer (14) matching said flyweights, a rolling member (12) defining a running surface (25) on the support and oscillating mass tracks, so as to guide a oscillation of the oscillating mass relative to the support, the oscillating mass comprising an elastically compressed plating member (16), whatever the position of the oscillating mass relative to the support, either between the spacer and / or a counterweight or the support on the one hand and the rolling member on the other hand, or between the spacer on the one hand and a counterweight and the rolling member on the other hand. 2. Device according to claim 1, wherein the plating member (16) is supported on the spacer. 3. Device according to any one of the preceding claims, in which the plating member is a leaf spring at least partially curved around an axis parallel to the X axis. 4. Device according to any one of the preceding claims, wherein the spacer and / or the plating member comprises a housing (15) shaped to receive the plating member in a retracted position. 5. Device according to any one of the preceding claims, in which the plating member comprises one or more lateral protuberances (17) received in one or more respective recesses formed in the first and / or the second counterweight. 6. Device according to any one of the preceding claims, in which the oscillating mass rolling track (23) is defined by the spacer and / or the plating member. 7. Device according to any one of the preceding claims, in which the plating member comprises an opening (19) through which the rolling member bears. 5 on the spacer. 8. Device according to the preceding claim, wherein the rolling member has a diameter, in the area of contact with the plating member, less than its diameter in the area of support with the spacer. 9. pendulum damping device according to claim 1, in which the 10 bearing has an axial end (13) guided by an edge of a buttonhole (26; 28) formed in one of said weights, the plating member being at least partially interposed between the axial end and the buttonhole edge. 10. Component for a transmission system of a motor vehicle, the component being in particular a double damping flywheel, a hydrodynamic torque converter or 15 a friction clutch disc, comprising a pendulum damping device according to any one of the preceding claims.