FR3031560B1 - TORSION OSCILLATION DAMPING DEVICE - Google Patents

Abstract

A device for damping torsional oscillations, comprising: - a support adapted to move in rotation about an axis, - at least one pendular body comprising: a first and a second pendular masses axially spaced relative to one another; the other and movable relative to the support, the first pendular mass being disposed axially of a first side of the support and the second pendulum mass being disposed axially of a second side of the support, and at least one connecting member of the first and the second pendulum masses matching said masses, and - at least one stop damping member (25), carried by one of the pendulum body and the support, and able to simultaneously come into contact with the pendulum body and the support for relative positions of the pendulum body with respect to the support, the abutment damping member (25) extending about an axis (Y) and including a plurality of damping units of b ute (30) separate one another at a distance from each other about this axis (Y).

Description

The present invention relates to a device for damping torsional oscillations, in particular for a motor vehicle transmission system.

In such an application, the torsion oscillation damping device may be integrated with a torsion damping system of a clutch capable of selectively connecting the heat engine to the gearbox, in order to filter the vibrations due to motor acyclisms.

Alternatively, in such an application, the torsion oscillation damping device may be integrated with a friction disk of the clutch or with a hydrodynamic torque converter.

Such a device for damping torsional oscillations conventionally implements a support and one or more pendular bodies movable relative to this support, the displacement relative to the support of the pendular bodies being guided by rolling members cooperating with one another. part with bearing tracks secured to the support, and secondly with rolling tracks secured to the pendular bodies. Each pendulum body comprises for example two pendular masses riveted together. At the end of the displacement of a pendulum body, when torsional oscillations occur, the pendulum body abuts against the support. This abutment can cause unwanted noises, especially when the parts coming into contact with the pendulum body and the support are metallic, and also cause wear of the pendulum body and the support.

To overcome this drawback, it is for example known from the application WO 2014/023306 to provide the rivets connecting two pendular masses of a pendular body of a stop damping member in the form of an annular coating elastomer.

Such a coating dampens the abutment of the rivet against the support, thereby avoiding the metal shock mentioned above. A rivet 100 provided with such an annular coating 101 of elastomer is shown in FIG.

When such a rivet 100 comes into contact with the support of the damping device, a portion 102 of the elastomer is crushed between the rivet 100 and an edge of the support. Due to this compression, the portions 103 adjacent to the portion 102 are then subjected to shear forces. The portions 103 being intended to be subsequently crushed between the rivet 100 and the support, the same portions of the abutment damping member 101 thus alternately undergo compression forces and shear forces. The service life of the abutment damping member is thus reduced.

There is a need to dampen the shocks associated with the abutment of a pendulum body against the support in a sufficiently effective and durable manner. The invention aims to meet this need, and it succeeds, according to one of its aspects, with a device for damping torsional oscillations, comprising: a support able to move in rotation about an axis, - at least one pendular body comprising: a first and a second pendular masses axially spaced relative to one another and movable relative to the support, the first pendulum mass being disposed axially of a first side of the support and the second pendulum mass being disposed axially of a second side of the support, and at least one connecting member of the first and second pendulum masses matching said masses, and - at least one damping member of stop, carried by one of the pendulum body and the support and adapted to come simultaneously in contact with the pendulum body and the support for relative positions of the pendular body relative to the support, the o A thrust damping member extending about an axis and including a plurality of separate abutment damping units spaced apart from each other about said axis.

According to the above aspect of the invention, the abutment damping units being two by two distinct, the compression forces exerted on the one of them which is interposed between the support and the pendulum body during a in abutment do not affect other abutment damping units which are not subject to shear forces. The life of the abutment damping member is thus extended relative to that of the abutment damping member according to Figures 2 and 3.

The relative positions of the pendulum body with respect to the support mentioned above may comprise the stop positions of the pendulum body against the support at the end of a displacement, in the trigonometrical or non-trigonometric direction, from the position rest of the device.

The abutment damping units can all be of the same shape when the abutment damping member is not simultaneously in contact with the pendulum body and the support. In a plane perpendicular to the axis of the abutment damping member, these abutment damping units have for example a circular section, oval, or other.

The number of abutment damping units of the abutment damping member is for example between two and twelve, being in particular equal to ten.

For the purposes of the present application: - "axially" means "parallel to the axis of the abutment damping member", - "transversely" means "perpendicular to the axis of the abutment damping member" - "radially" means "along a line in a plane orthogonal to the axis of the abutment damper and intersecting that axis", - "angularly" or "circumferentially" means "around the 'axis of the abutment damping member', and - 'integral' means 'rigidly coupled'.

When the axis of the abutment damping member is parallel to the axis of rotation of the support, the above terms may, if necessary, be assessed relative to the axis of rotation of the support.

Along the axis of the abutment damping member, each abutment damping unit may have a constant shape. Alternatively, the abutment damping member may extend axially between two ends and have a middle portion between these two ends, and the transverse dimension of the middle portion may be greater than the transverse dimension of the axial ends.

According to a first exemplary implementation of the invention, two circumferentially adjacent abutment damping units may be separated by empty zones, these empty zones occupying the circumferential space between these two abutment damping units. There is thus no way for compressive forces on a stop damper unit to cause shear of circumferentially adjacent abutment damping units.

All abutment damping units can extend in the same axial planes and the empty areas can then occupy all of these axial planes circumferentially between two adjacent abutment damping units.

Still according to this first example of implementation, the abutment damping member may comprise at least one plate for holding the abutment damping units, said holding plate cooperating with each abutment damping unit so as to keep them at a distance from each other.

The holding plate thus ensures a role of maintaining in position the abutment damping units. Each abutment damping unit is not necessarily integral with the holding plate. The abutment damping units are for example rotatable on itself relative to the holding plate.

Alternatively, all the abutment damping units are integral with the holding plate, being then all integral with each other.

The holding plate may, if appropriate, be integral with the support or the pendular body, so that all the abutment damping units can be integral with the support or the pendulum body.

Still according to the first example of implementation of the invention, the abutment damping member may comprise a first and a second holding plate, the first, respectively second, holding plate being disposed at a first and second respectively axial end of the abutment damping units, so that the first, respectively second, holding plate cooperates with all first, respectively second, axial ends of the abutment damping units.

As mentioned above, the abutment damping units may or may not be integral with the two holding plates, and / or each holding plate may be integral with that of the pendular body and the support which carries the abutment damping member. .

The abutment damping units may or may not extend exclusively into the axial space delimited by the first and second holding plates.

Each holding plate is for example in the form of a plate recessed internally.

According to a second exemplary implementation of the invention, the circumferentially adjacent thrust damping units are connected in pairs by at least one bridge extending circumferentially between said thrust damping units. These bridges can be used to hold the abutment damping units in place relative to each other, so that the one or more holding plates according to the first example of implementation above are no longer necessary. Such a stop damping member can thus be simpler and less expensive to manufacture.

Each bridge may have a radial dimension much smaller than that of the thrust damping units. The ratio between the radial dimension of a bridge and that of an abutment damping unit is for example between 0.01 and 0.3.

According to a particular example of the second example of implementation of the invention, the bridges can be made in one piece with the abutment damping units. The abutment damping member can then be monobloc. Such abutment damping member can then be made simply, in particular by molding.

The bridges may belong to the surface of the abutment damping member closest to the axis of the abutment damping member.

Alternatively, the bridges may be positioned at a distance from the surface of the abutment damping member closest to that axis and away from the surface of the abutment damping member furthest from this axis.

In all of the foregoing, each abutment damping unit may have resilient properties for damping shocks in said relative positions of the pendular body relative to the support. Each abutment damping unit is for example made of elastomer or rubber. The connecting member secures together the first and the second pendulum mass, so that the pendular body forms a single integral assembly. The connecting member may be received in a window formed in the support.

In all of the above, the abutment damping member may be carried by the connecting member of the pendulum body.

Alternatively, in all the above, the abutment damping member may be carried by a pin secured to the support. This pin may be formed by a protrusion of the support or be attached to the support.

The device for damping torsional oscillations may comprise at least one rolling member cooperating on the one hand with the pendulum body and on the other hand with the support, so as to guide the displacement of the pendular body relative to the support.

The pendular body can then define two raceways, a raceway being defined in the first pendulum mass and a raceway being defined in the second pendulum mass. The first and the second pendulum mass have for example a cavity receiving the rolling member and a portion of the edge of this cavity forms the corresponding raceway. The portion of the rolling member arranged axially between the first and the second pendulum mass is received in a cavity of the support, this cavity being distinct from the window in which the connecting member is received. The rolling member may then comprise successively: a portion disposed in a cavity of the first pendulum mass and cooperating with the raceway formed by a portion of the edge of this cavity, a portion disposed in a cavity of the support and cooperating with the raceway formed by a portion of the edge of this cavity, and - a portion disposed in a cavity of the second pendulum mass and cooperating with the raceway formed by a portion of the edge of this cavity.

In all the foregoing, an interposition piece, also called "pad", may be provided to interpose axially between the support and the pendular masses, so as to avoid axial shocks between them.

In all of the foregoing, the pendulum body may comprise: two, in particular three, angularly offset connecting members and joining together the two pendular masses of a pair, and two, in particular three, abutment damping members, each stop damping member being associated with a connecting member.

Separate windows of the support can then be associated with the same pendulum body, each window receiving one of the connecting members and the associated abutment damping member.

In all the foregoing, the device may comprise: at least one first pendular body for filtering a first order value of the torsional oscillations, and at least one second pendular body for filtering a second order value of the torsional oscillations, different from the first order value.

In all the foregoing, each running member is for example a roll of circular section in said plane orthogonal to the axis of rotation of the support. The axial ends of the roll may be devoid of a thin annular flange. The roller is for example made of steel.

In all of the above, the shape of the rolling tracks may be such that the pendulum bodies are only displaced relative to the support in translation about a fictitious axis parallel to the axis of rotation of the support.

As a variant, the shape of the rolling tracks may be such that the pendular bodies are displaced with respect to the support both: in translation around a notional axis parallel to the axis of rotation of the support and also in rotation around the center of gravity of said pendulum body, such a movement being again called "combined movement" and disclosed for example in the application DE 10 2011 086 532.

In all of the above, the support may or may not be made in one piece.

The device comprises for example several pendular bodies, for example a number between two and eight, including three or six pendulous bodies. All these pendular bodies may succeed one another circumferentially. The device can thus comprise a plurality of planes orthogonal to the axis of rotation in each of which all the pendular bodies are arranged. Another subject of the invention, according to another of its aspects, is 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 disk, comprising a device damping torsional oscillations as defined above.

The support of the torsion oscillation damping device can then be one of: - a web of the component, - a guide washer of the component, - a phasing washer of the component, or - a separate support of said web, said guide ring and said phasing washer. Another object of the invention is, according to another of its aspects, an abutment damping device for a torsion oscillation damping device comprising a support and a movable pendulum body with respect to the support, the abutment damping extending about an axis and including a plurality of separate abutment damping units succeeding one another at a distance from each other about said axis. The invention will be better understood on reading the following description of non-limiting examples of implementation thereof and on examining the appended drawing in which: FIG. 1 schematically represents a device torsion damping device to which thrust damping members according to the invention can be integrated; - FIGS. 2 and 3 show a stop damping device according to the prior art; FIG. 4 is an isolated representation of a abutment damping member according to a first exemplary implementation of the invention, - Figure 5 shows the abutment damping member of Figure 4 when carried by a connecting member of the device of the FIG. 6 is a section along VI of the abutment damping member of FIG. 5 when the latter simultaneously comes into contact with the support and with the pendulum body, FIG. stop damping member of Figure 4 when carried by the support, and - Figures 8 and 9 are isolated two variants of a stop damping member according to a second example of implementation of the invention.

FIG. 1 shows a damping device 1 to which one or more abutment damping members according to the invention can be integrated. The damping device 1 is of the pendulum oscillator type. The device 1 is particularly suitable for equipping a motor vehicle transmission system, being for example integrated with a component not shown of such a transmission system, this component being for example a double damping flywheel, a hydrodynamic torque converter or a friction disc.

This component can be part of a propulsion system of a motor vehicle, the latter comprising a thermal engine including three or four cylinders.

In known manner, such a component may comprise a torsion damper having at least one input element, at least one output element, and circumferentially acting resilient return members which are interposed between said input and output elements. . For the purposes of the present application, the terms "input" and "output" are defined with respect to the direction of torque transmission from the engine of the vehicle to the wheels of the latter.

The device 1 comprises in the example under consideration: a support 2 able to move in rotation about an axis X, and a plurality of pendular bodies 3 movable relative to the support 2.

In the example considered, four pendulous bodies 3 are provided, being evenly distributed around the periphery of the X axis. For the purposes of the description, only three pendulous bodies 3 are shown in FIG. 1.

The support 2 of the damping device 1 may consist of: - an input element of the torsion damper, - an output element or an intermediate phasing element disposed between two series of spring of the damper, or an element linked in rotation to one of the aforementioned elements and distinct from the latter, then being for example a support specific to the device 1.

The support 2 is in particular a guide washer or a phasing washer.

In the example considered, the support 2 generally has a ring shape having two opposite sides which are here plane faces.

As can be seen in FIG. 1, each pendulum body 3 comprises in the example under consideration: two pendulum masses 5, each pendulum mass 5 extending axially facing one side of the support 2, and three link 6 solidarisant the two pendulum masses 5.

The connecting members 6, which are here rivets, are in the example considered angularly offset.

Each connecting member 6 extends in part in a window 9 formed in the support. In the example considered, the window 9 defines a blank space inside the support, this window being delimited by a closed contour.

The device 1 further comprises in the example in question rolling members 11 guiding the displacement of the pendular bodies 3 relative to the support 2. The rolling members 11 are here rollers of which at least a portion has a circular cross section.

In the example described, the movement relative to the support 2 of each pendulum body 3 is guided by two rolling members 11.

Each rolling member 11 cooperates on the one hand with a running track 12 defined by the support 2, and which is here formed by a portion of the contour of a cavity 14 formed in the support 2 and distinct from the window 9, and on the other hand with two rolling tracks 13 defined by the pendulum body 3. Each pendulum mass 5 of the pendular body has here for each rolling member 11 a cavity 16, a portion of the contour defines a rolling track 13.

More precisely, each rolling member 11 interacts radially internally with the rolling track 13 and radially outside the rolling track 12 as it moves relative to the support 2 and to the pendulum body 3.

In addition, as shown in FIG. 1, the rolling member 11 can comprise successively axially: a portion disposed in a cavity 16 of the first pendulum mass and cooperating with the rolling track formed by a portion of the edge of this cavity 16, a portion disposed in a cavity 14 of the support 2 and cooperating with the raceway 12 formed by a part of the edge of this cavity 14, and a portion disposed in a cavity 16 of the second pendulum mass 5 and cooperating with the rolling track 13 formed by a portion of the edge of this cavity 16.

According to the invention, the device 1 comprises stop damping members 25.

In the example of FIGS. 4 to 6 and 8-9, each connecting member 6 carries, for example, an abutment damping member 25. Three abutment damping members 25 are then associated with a pendulum body 3.

In a variant, and as illustrated in FIG. 7, the abutment damping members are not carried by the connecting members 6 but by pins 40 integral with the support 2.

Each abutment damping member 25 can make it possible to reduce, or even to avoid, shocks occurring when a pendular body abuts against the support at the end of a movement from the rest position.

As can be seen in the figures, each abutment damping member 25 extends around an axis Y. This axis Y is in the examples considered parallel to the axis X of rotation of the support 2.

Each stop damping member 25 comprises a plurality of separate abutment damping units 30 and succeeding one another at a distance from each other about the Y axis. In the example under consideration, ten units of abutment stop damping 30 are provided. For example, all the abutment damping units 30 have the same shape when the abutment damping member is not simultaneously in contact with the support 2 and with the pendulum body 3. In the examples shown, each unit abutment damping 30 has, in a plane orthogonal to the Y axis, a substantially circular section. In unrepresented examples, this section may be other, for example oval.

Each abutment damping unit 30 is here made of a material having elastic properties for damping shocks related to the abutment of the pendulum body 3 against the support 2. Each abutment damping unit 30 is for example made of elastomer or rubber.

4 to 7 will now be described a stop damping member 25 according to a first example of implementation of the invention.

According to this first example of implementation, the circumferentially adjacent stop damping units 30 are separated by empty zones which occupy the circumferential space between them. In other words, the abutment damping member 25 is, according to this first example, devoid of bridges extending circumferentially between the adjacent abutment damping units 30.

Each abutment damping unit 30 is only angularly surrounded by a vacuum.

According to this example, the abutment damping member 25 comprises two retaining plates 32. Each retaining plate 32 is here in the form of a recessed annular plate, so as to let the body of the link 6. Each holding plate 26 is for example mounted with a slight clearance on the connecting member 6. The holding plates 32 are arranged axially at a distance from one another and they define the axial space in which extend the abutment damping units 30.

As can be seen in FIGS. 4 and 5, the abutment damping units 30 have a variable cross section when moving along the Y axis.

Each abutment damping unit 30 extends between two axial ends 35. Between these two axial ends 35 is disposed a middle portion 37 whose cross section is greater than that of the axial ends 35.

Each axial end 35 is here secured to one of the holding trays 32. In the example in question, this securing is via a bonding by melting material. The holding plates 32 thus make it possible to hold together the abutment damping units 30 of the abutment damping member 25. When they are secured to the connecting member 6, the holding plates 32 allow then to make the abutment damping units 30 immobile relative to the connecting member 6.

When the pendulum body 3 comes into abutment against the support 2, the abutment damping member 25 is interposed between the connecting member 6 and an edge of the support 2, so that one of the units abutment damping 30 simultaneously comes into contact with the connecting member 6 and with this edge of the support. This contact leads to compression of this abutment damping unit 30. The latter can then, by deforming, dampen the shock associated with this abutment.

As can be seen in FIGS. 4 to 6, due to the lack of connection between the adjacent abutment damping units other than via the holding plates 32, compression of a damping unit is prevented. 30 of the abutment 30 having the repercussions according to the prior art on the other abutment damping units 30 of the abutment damping member 25. The example of FIG. 7 differs from that of FIGS. the fact that each holding plate 32 is mounted on a pin 40 protruding axially from the support 2. The abutment damping member 25 is then carried by the support 2, and not by the pendulum body 3.

This abutment damping member 25 cooperates with the end portions 42 of the radially inner edge 44 of a pendulum mass 5 when it abuts against the support 2 at the end of a displacement from the rest position.

We will now describe with reference to Figures 8 and 9 a stop damping member 25 according to a second example of implementation of the invention.

According to this second exemplary embodiment of the invention, the circumferentially adjacent thrust damping units 30 are pairwise connected by a bridge 45 extending circumferentially between said thrust damping units 30.

The stop damping units 30 have, according to this second example of implementation of the invention, a constant cross section, when moving along the Y axis.

As can be seen in FIGS. 7 and 8, each bridge 45 may have a radial dimension d representing less than 10% of the radial dimension D of a thrust damping unit 30.

In the examples described with reference to this second example of implementation of the invention, the bridges 45 are made in one piece with the abutment damping units 30, the abutment damping member 25 then being piece.

In the example of FIG. 8, the bridges 45 are disposed substantially midway between the surface of the abutment damping member 25 closest to the Y axis and the surface of the damping member. stop 25 farthest from the Y axis.

Alternatively, in the example of Figure 9, the bridges 45 belong to the surface of the abutment damping member 25 closest to the Y axis. This surface of the abutment damping member forms here a cylindrical wall 50 which extends all around the Y axis. The invention is not limited to the examples which have just been described.

In particular, a stop damping member 25 as shown in FIGS. 8 and 9 may be carried by the support 2, similar to that shown in FIG. 7.

Claims (13)

claims 1. Device (1) for damping torsional oscillations, comprising: - a support (2) able to move in rotation about an axis (X), - a plurality of pendular bodies (3), each body pendulum (3) comprising: first and second pendulum masses (5) axially spaced relative to each other and movable relative to the support (2), the first pendulum mass (5) being disposed axially of a first side of the support (2) and the second pendulum mass (5) being arranged axially on a second side of the support (2), and at least one connecting member (6) of the first and second pendulum masses (5). ) matching said masses, and - abutment damping members (25), each abutment damping member (25) being carried by one of a pendulum body (3) and the support (2), and adapted to simultaneously come into contact with the pendulum body (3) and the support (2) for relative positions of the pendulum body (3) relative to the support (2), each stop damper member (25) extending about an axis (Y) and including a plurality of separate abutment damping units (30). succeeding one another at a distance from this axis (Y). 2. Device according to claim 1, the abutment damping units (30) being all of the same shape when the abutment damping member (25) is not simultaneously in contact with the pendulum body and the support ( 2). 3. Device according to claim 2, each abutment damping unit (30) having, in a plane perpendicular to the axis of the abutment damping member (Y), a circular or oval section. 4. Device according to any one of claims 1 to 3, two circumferentially adjacent thrust damping units (30) being separated by empty zones, these empty zones occupying the circumferential space between these two damping units. stop (30). 5. Device according to claim 4, each stop damping member (25) comprising at least one holding plate (32) stop damping units (30), said holding plate (32) cooperating with each unit damping means (30) so as to keep the latter at a distance from one another. 6. Device according to claim 5, all abutment damping units (30) being integral with the holding plate (32). 7. Device according to any one of claims 4 to 6, each stop damping member (25) comprising a first and a second holding plate (32), the first, respectively second, holding plate being disposed at a first, respectively second, axial end (35) of the abutment damping units (30), so that the first, respectively second, holding plate cooperates with all first, respectively second, axial ends (35) of the thrust damping units (30). 8. Device according to any one of claims 1 to 3, the circumferentially adjacent abutment damping units (30) being pairwise connected by at least one bridge (45) extending circumferentially between said damping units of stop (30). 9. Device according to claim 8, the bridges (45) being made in one piece with the abutment damping units (30). 10. Device according to claim 8 or 9, the bridges (45) belonging to the surface (50) of the abutment damping member (25) closest to the axis (Y) of this damping member. stop (25). 11. Device according to claim 8 or 9, the bridges (45) being disposed at a distance from the surface of the abutment damping member (25) closest to the axis (Y) of this damping member. stop (25), and away from the surface of the abutment damping member (25) furthest from said axis (Y). 12. Device according to any one of the preceding claims, each abutment damping member (25) being carried by a connecting member (6) of a pendulum body (3). 13. Device according to any one of claims 1 to 11, each stop damping member (25) being carried by a pin (40) integral with the support (2).