FR3029253A1 - TORSION OSCILLATION DAMPING DEVICE - Google Patents

Abstract

Device (1) for damping torsional oscillations, comprising: - a support (2) able to move in rotation about an axis (X), - at least one pendulum body (3) comprising: a first and a second pendular mass (5) axially spaced relative to each other and movable relative to the support (2), the first pendulum mass (5) being arranged axially on a first side (4) of the support (2 ) and the second pendulum mass (5) being disposed axially of a second side (4) of the support (2), and at least one connecting member (6) of the first and second pendulum masses (5) matching said masses, - at least one rolling member (11) cooperating on the one hand with a rolling track (12) defined by the support (2) and on the other hand with a rolling track (13) defined by the pendulum body (3) to guide the displacement of the pendulum body (3) relative to the support (2), and - at least one interposition piece (31) por one of the first and second pendulum masses (5), the interposition piece (31) being arranged in such a way as to avoid contacting in the axial direction (X) between said pendulum mass (5) and the rolling member (11), the interposition piece (31) comprising a housing (50) cooperating with an axial end (51) of the rolling member (11) during all or part of the displacement of the rolling member (11) along the rolling track (13) defined by the pendulum body (3).

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 employs 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. Axial shocks may occur between the pendulum bodies and the support. These shocks can cause premature wear of the aforementioned elements of the damping device and / or generate unwanted noises, especially when these elements are metal. In order to avoid the occurrence of such shocks, it is known, for example, from the application DE 10 2006 028 556 to provide at least one of the pendulum masses with a pad interposed axially between the support and this pendulum mass.

There is a need to improve the torsional oscillation damping devices provided with axial pads. The invention aims to meet this need and it achieves, in 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 each 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 arranged axially on a second side of the support, and at least one connecting member of the first and second pendular masses matching said masses, - at least one rolling member cooperating with on the one hand with a rolling track defined by the support and on the other hand with a running track defined by the pendulum body to guide the displacement of the pendular body relative to the support, and - at least one piece of interposition carried by one of the first and the second pendulum mass, the interposition piece being arranged so as to avoid the coming into contact in the axial direction between said pendulum mass and the rolling member, the piece interposition comprising a housing cooperating with an axial end of the rolling member during all or part of the displacement of the rolling member along the raceway defined by the pendulum body.

The invention also relates to the interposition piece above, considered in isolation. In addition to reducing or even avoiding axial shocks between one of the pendulum masses and the running gear, the interposition piece according to this aspect of the invention cooperates with the rolling member during its displacement. to guide this movement. This cooperation of the axial end of the rolling member with the housing can promote a retention of the rolling member against the raceway defined by the pendulum body. The interposition piece is in particular made of a damping material, such as plastic or rubber. For the purposes of the present application: - "axially" means "parallel to the axis of rotation of the support", - "radially" means "along an axis belonging to a plane orthogonal to the axis of rotation of the support and intersecting this axis of rotation of the support ", -" angularly "or" circumferentially "means" around the axis of rotation of the support ", and -" integral "means" rigidly coupled ".

The axial end of the rolling member may define a sliding pin in the housing formed in the interposition piece during all or part of the movement of the rolling member along the raceway defined by the pendulum body . The housing defined in the pendulum mass can be through. Alternatively, it may be a blind housing.

Whether through or blind, the housing can extend between two angular ends and be radially delimited by a radially inner edge and a radially outer edge. Each angular end of the housing may form a stop for the displacement of the axial end of the rolling member relative to the pendulum body, so that said axial end cooperates with the housing during the entire displacement of the rolling member. along the rolling track defined by the pendulum body. In this case, the interposition piece allows, via its housing, to stop the running member when the latter is subjected to a large clearance relative to the support. The interposition piece thus prevents the rolling member from escaping. The radially inner edge and / or the radially outer edge of the housing can make it possible to lock the running gear in the housing during the starting or stopping phases of the vehicle, thus ensuring the maintenance of this axial end, in particular of the pin, in the accommodation. The interposition piece may have an interposition portion disposed axially between said pendulum mass and the rolling member, and this interposition portion may have a surface chosen to prevent coming into contact in the axial direction between the member. and said pendulum mass for several different positions of the rolling member along the raceway defined by the pendulum body. Such an interposing piece thus ensures a non-zero axial gap between the rolling member and one of the pendulum masses during at least a portion of the displacement of the rolling member along the raceway. The interposition portion may allow the existence of this axial gap by interposing axially between the running member and the pendulum bearing the interposition piece for each of these distinct positions of the rolling member along the rolling track defined by the pendulum body. In a particular example, the surface of the interposition portion of the interposition piece is chosen to prevent the coming into contact in the axial direction between the rolling member and said pendulum mass for all the positions of the rolling along said runway. In other words, regardless of its position along the raceway defined by the pendulum body, the rolling member never comes into contact with the pendular mass carrying the interposition piece, for example because the portion of interposition is always interposed axially between the rolling member and the pendulum mass. In all of the foregoing, the interposition piece may be arranged to prevent contact in the axial direction between said pendular mass and the support. The interposition portion extends for example also axially facing a fraction of the support, so as to prevent this coming into contact, at least when the device is in the rest position. The interposition piece may comprise at least one fixing portion on one of the pendulum masses, the fixing portion comprising at least two fixing lugs and a reinforcement connecting these two tabs. Such reinforcement allows the fastening tabs to be more resistant to the forces acting on the latter during the displacement of the pendular body relative to the support. According to one embodiment of the invention, the raceway defined by the pendulum body is defined by the connecting member. Such a connecting member is also called "rolling spacer", serving both to secure the pendulum masses of a pair between them and to participate in guiding the displacement of the pendular body relative to the support. The connecting member can then be received in a window formed in the support, and a portion of the edge of this window can form the raceway defined by the support. Two connecting members can then be provided to match the first and second pendulum masses, and these connecting members can each be arranged in a clean window formed in the support. Each connecting member may define a running track cooperating with a single rolling member. According to this embodiment, there are planes orthogonal to the axis of rotation intersecting both a raceway defined by the pendulum body and a raceway defined by the support. If necessary, one of the pendulum masses carries several interposing parts and only some of them have a housing as mentioned above and / or only some of them have an interposition portion whose surface is chosen as mentioned above. The first pendulum mass may carry at least one interposition piece, as described above, arranged in such a way as to avoid contacting in the axial direction between this first pendulum mass and the rolling member, and the second mass The pendulum may carry at least one interposition piece, as described above, arranged in such a way as to avoid the coming into contact in the axial direction between this second pendulum mass and the rolling member. In this case, each interposition piece may comprise a housing cooperating with a respective axial end of the rolling member during all or part of the movement of the rolling member along the raceway defined by the pendulum body . In all of the foregoing: - the torsion oscillation damping device has a rest position in which the pendulum body is subjected to a centrifugal force but not to acyclisms, - the torsion oscillation damping device has a stop position of the pendulum body against the support, at the end of a movement in the trigonometric direction of the pendular body relative to the support from the rest position, and - the torsion oscillation damping device present a stop position of the pendulum body against the support, after a displacement in the non-trigonometric direction of the pendular body relative to the support from the rest position. Each connecting member may carry at least one abutment damping member for damping the impacts associated with the contacts existing between the connecting member and the support for at least one of the rest position and the stop positions above. The abutment damping member may be a strip or a coating extending along a part of the outline of the connecting member, as disclosed, for example, in DE 201 217 958. Alternatively, abutment damping member may be as disclosed in the application filed in France on October 14, 2014 under number 14 59836. In all the foregoing, the pendulum body may comprise: - two connecting members angularly offset and secured between they two pendulum masses of a pair, and - two abutment damping members, each abutment damping member being associated with a connecting member. Two windows angularly speaking consecutive support can then be associated with the same pendulum body, each window receiving one of the connecting members, the associated abutment damping member, and a running 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. For the purposes of the present application, an order value of the torsional oscillations is filtered when the amplitude at this order value of the torsional oscillations is reduced by the device by a value equal to at least 10% of the amplitude before filtering. Since the device is configured to filter orders, the frequency of the torsional oscillations filtered by the first, respectively second, pendular bodies varies as a function of the speed of rotation of the support. The use of the term "order" implies dealing with variable frequencies. 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 the above, each running member can be solicited solely in compression between the raceway defined by the support and the raceway defined by the pendulum body. 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. The pendular bodies can then succeed each other around the axis of rotation of the support. All these pendular bodies can be received in the same axial space. 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. The invention will be better understood on reading the following description of nonlimiting examples of implementation thereof and on examining the appended drawing in which: FIG. 1 schematically represents a device torsion damping to which interposition pieces according to the invention can be integrated; FIG. 2 represents a detail of the device of FIG. 1 to which interposition pieces according to an embodiment of the invention are integrated, the device being at rest, - Figure 3 shows a detail of Figure 2, - Figure 4 is a view similar to Figure 2, the device being this time in abutment position against the support at the end a displacement from the rest position, - Figure 5 shows a detail of Figure 4, - Figure 6 is a sectional view along VI-VI of Figure 2, - Figure 7 shows isolated parts Interposing visible on the f and FIG. 8 is a sectional view, in a plane containing the axis of rotation of the device, of the interposition piece when it is carried by one of the pendulum masses of the pendulum body of the device. FIG. 1 shows a damping device 1 to which one or more interposition pieces according to the invention can be integrated. These pieces of interposition are still called "skates". 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 FIGS. 1 to 3, the device 1 is at rest. In known manner, such a component may comprise a torsion damper having at least one input element, at least one output element, and elastic return members. circumferential action 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 in question: a support 2 able to move in rotation around an axis X, and a plurality of pendular bodies 3 movable relative to the support 2. In the example considered, three bodies pendulum 3 are provided, being evenly distributed around the periphery of the X axis. The support 2 of the damping device 1 may consist of: - an input element of the torsion damper, - an element of output or an intermediate phasing element disposed between two series of spring of the damper, or - an element connected 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 4 which are here planar faces. As can be seen in particular 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 4 of the support 2, and two connecting members 6 solidarisant the two pendulum masses 5. The connecting members 6, also called "spacers", 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 void space inside the support, this window being delimited by a closed contour 10. The device 1 further comprises in the example considered rolling members 11 guiding the displacement of the bodies The rolling elements 11 are here rollers of which at least one portion has a circular cross section of radius R. In the example described, the movement relative to the support 2 of each pendulum body 3 is guided by two rolling members 11, each of them cooperating with one of the connecting members 6 of the pendulum body 3.

Each rolling member 11 cooperates on the one hand with a rolling track 12 defined by the support 2, and which is here formed by a portion of the contour 10 of the window 9, and on the other hand with a rolling track 13 defined by the pendulum body 3, and which is here formed by a portion of the outer contour of the connecting member 6. More specifically, each rolling member 11 interacts radially internally with the raceway 13 and radially outwardly with the running track 12 during its displacement relative to the support 2 and the pendulum body 3, being for example only stressed in compression between the raceways 12 and 13. As shown for example in Figure 3, the raceways 12 and 13 show in the example described portions radially facing one another.

In the examples considered, the device 1 comprises stop damping members 25. Each connecting member 6 carries for example a stop damping member 25. These stop damping members 25 may, as shown in FIG. 1, be as described in the application filed in France on October 14, 2014 under number 14 59836. Alternatively, these abutment damping members 25 may be in the form of a surrounding coating in a plane orthogonal to the rotation axis a portion of the periphery of the connecting member 6, as shown in Figures 2 to 5. Such a stop damping member 25 may have axial rods 27 whose ends are received in one of the pendulum masses 5, so as to secure this abutment damping member 25 with the pendular masses of a pendulum body 3.

These abutment damping members 25 serve to dampen the shocks associated with the abutment against the support 2 of the pendulum body 3 at the end of a displacement from the rest position, whatever the direction of this displacement. . Such displacement occurs in planes orthogonal to the axis of rotation X, and not axially. The abutment damping members 25 may furthermore make it possible to damp the shocks associated with the radial drop of the pendulum body 3 for low speeds of rotation of the engine of the vehicle, for example during the starting or stopping of the vehicle . The device 1 comprises interposing parts 30 and 31 which will now be described. Each interposition piece 30 or 31 is in particular made of a damping material, such as plastic or rubber.

In the example considered, the interposing parts 30 and 31 are carried by a pendulum mass 5, and each pendulum mass 5 of a pendulum body 3 carries interposition pieces 30 and 31. Each interposition piece 30 or 31 is in the example considered arranged so as to avoid coming into contact in the axial direction, that is to say along the axis X, between the pendulum 5 which carries it and one of the rolling members 11 of the pendulum body 3. Each interposition piece 30 or 31 comprises, as shown more clearly in FIGS. 7 and 8: an interposition portion 33 configured to prevent this coming into contact along the X axis, and at least one fixing portion 34 on the pendulum mass 5. This fixing portion 34 comprises in the examples considered three fastening tabs 36 which extend generally about a Y axis parallel to the X axis, between an end 39 originating at the level of the interposi portion 33 and a free end 40 for fixing on the pendulum mass 5. Each free end 40 forms in the example in question a snap hook of the fastening tab 36 on the pendulum mass 5. In the examples considered, a cutout 42 is formed in the interposition portion 33 radially opposite each fastening tab 36 and radially outwardly to this tab 36 from the Y axis. Still in the examples considered, a reinforcement 45 connects the fastening tabs 36 in pairs . The reinforcement is, in the examples described, arranged all around the Y axis and is formed by a flange extending along a fraction of the fastening tabs 36 from the interposition portion 33. The reinforcement 45 presents here a constant length all around the Y axis.

The reinforcement 45 can confer on the interposition pieces 30 or 31 a better resistance to the shear forces applied on the latter during the displacement of the pendular body 3 with respect to the support 2. In addition, as can be seen in particular on the FIG. 8, the reinforcement 45 can make it possible to center the interposition piece 30 or 31 in the hole formed in the pendulum mass 5 to receive the fixing portion 34. As represented in FIGS. 2 and 4, a pendulum mass 5 carries for example only one interposition piece 30, and the latter can be arranged on the pendulum mass 5 substantially at mid-distance between the angular ends of this pendulum mass 5. The position of this interposition piece 30 can be chosen to that the latter is always at least partly axially facing the support 2, so as to prevent axial shocks between the support 2 and the pendulum mass 5. In the example considered d, each interposition piece 30 and each interposition piece 31 has two attachment portions 34 The interposition pieces 31 will now be described. They differ from the interposition pieces 30 by their number on the same pendulum mass 5, by the shape of their interposition portion 33, and by the fact that they can cooperate with an axial end 51 of a rolling member 11 associated with the pendulum body 3. It can be seen in FIG. 6 that the two attachment portions 34 of the same interposition piece 31 are different. One of the fixing portions 34, which is the most radially outer, is similar to that described above.

The other fixing portion 34, which is the most radially inner, here has only two attachment lugs 36 and is formed directly radially facing the raceway 13 defined by the connecting member 6. Each piece of interposition 31 is in the example considered associated with a connecting member 6 of the pendulum body 3 and has an interposed portion 33 disposed axially between the pendulum mass 5 which carries it and the rolling member 11. The surface of this interposition portion 33 is here sufficient to prevent the coming into contact in the axial direction between the rolling member 11 and the pendulum mass 5 for all positions of the rolling member 11 along the raceway 13 defined by the connecting member 6. Thus, the pendulum body 3 is: - in a rest position, when the vibration oscillation damping device 1 is at rest, which is shown in FIGS. 2 and 3, in a stop position against the support 2 at the end of the displacement of the pendulum body 3 from the rest position, which is shown in FIGS. 4 and 5, or in any intermediate position between these positions, the portion 33 of the interposer piece comes between the rolling member 11 and said pendulum mass 5 to prevent the X-axis contact between these parts 11 and 5. As shown in Figures 2 to 5 , the interposition portion 33 has for example, in the plane of the figures a surface whose outer contour is substantially elliptical.

The interposition portion 33 extends for example radially outwardly relative to the raceway 13 defined by the connecting member 6, and a portion of the outer contour of this interposition portion 33 may be directly opposite any this portion of the outer contour of the interposition portion 33 has for example the same shape as the shape of the raceway 13.

The interposition portion 31 which has just been described may also have a surface allowing it to come permanently interpose axially between the support 2 and the pendulum mass 5 which carries it. As can be seen in Figures 2, 4 and 6, each interposition portion 33 may further comprise a housing 50 cooperating with an axial end 51 of the rolling member 11 during movement of the rolling member 11 along the rolling track 13 defined by the connecting member 6. Each axial end 51 of the rolling member 11 defines for example a pin of radius r, smaller than the radius R of the rest of the rolling member 11 , and this pin 51 slides in the housing 50 during the displacement of the rolling member 11 along the raceway 13 defined by the connecting member 6. In the example, the housing 50 is through, it extends between two angular ends 54 and is radially bounded by a radially inner edge 55 and a radially outer edge 56. As can be seen in FIGS. 4 and 5, when the pendular body 3 abuts against the support 2, the pawn 51 can then be found r abut against one of the angular ends 54 of the housing 50. The interposing parts 31 may be other. The interposition portion 33 may have a surface allowing it to interpose axially between the rolling member 11 and the pendulum mass 5 carrying this interposition piece in only certain positions of the rolling member 11 along the rolling track 13 defined by the connecting member 6. The rolling track 13 has a length measured along said track between the location of the track with which the rolling member 11 cooperates when the device 1 is at rest and the location of said track with which the rolling member 11 cooperates when the pendulum body 3 is in an abutment position at the end of its displacement from its rest position. The surface of the interposition portion 33 of the interposition piece 31 may make it possible to come into contact along the X axis only when the rolling member 11 moves along a fraction of the track 13, the length of which is equal to 50%, for example, the length of the raceway 13. The housing 50 can cooperate with the pin 51 only during a portion of the displacement of the rolling member 11 along the rolling track 13 defined by the connecting member 6. The invention is not limited to the examples which have just been described.

Claims (13)

REVENDICATIONS1. Device (1) for damping torsional oscillations, comprising: - a support (2) able to move in rotation about an axis (X), - at least one pendulum body (3) comprising: a first and a second pendular mass (5) axially spaced relative to each other and movable relative to the support (2), the first pendulum mass (5) being arranged axially on a first side (4) of the support (2 ) and the second pendulum mass (5) being disposed axially of a second side (4) of the support (2), and at least one connecting member (6) of the first and second pendulum masses (5) matching said masses, - at least one rolling member (11) cooperating on the one hand with a rolling track (12) defined by the support (2) and on the other hand with a rolling track (13) defined by the pendulum body (3) to guide the displacement of the pendulum body (3) relative to the support (2), and - at least one interposition piece (31) por one of the first and second pendulum masses (5), the interposition piece (31) being arranged in such a way as to avoid contacting in the axial direction (X) between said pendulum mass (5) and the rolling member (11), the interposition piece (31) comprising a housing (50) cooperating with an axial end (51) of the rolling member (11) during all or part of the displacement of the rolling member (11) along the rolling track (13) defined by the pendulum body (3). 2. Device according to claim 1, the axial end (51) of the rolling member (11) defining a sliding pin in the housing (50) formed in the interposition piece (31) during all or part of the moving the rolling member (11) along the rolling track (13) defined by the pendulum body (2). 3. Device according to one of the preceding claims, the housing (50) being through. 4. Device according to any one of claims 1 to 3, the housing (50) extending between two angular ends (54), the housing being radially delimited by a radially inner edge (55) and a radially outer edge ( 56). 5. Device according to claim 4, each angular end (54) of the housing (50) forming a stop for the displacement of the axial end (51) of the rolling member (11) relative to the pendulum body (3). , so that said axial end (51) cooperates with the housing (50) during the entire displacement of the rolling member (11) along the raceway (13) defined by the pendulum body (3). 6. Device according to claim 5, the interposition piece (31) having an interposition portion (33) disposed axially between said pendulum mass (5) and the rolling member (11), and this interposition portion (33) having a surface selected to prevent contacting in the axial direction (X) between the rolling member (11) and said clamping mass (5) for a plurality of different positions of the rolling member (11) along of the rolling track (13) defined by the pendulum body (3). 7. Device according to any one of the preceding claims, the interposition piece (31) being arranged so as to avoid the coming into contact in the axial direction (X) between said pendulum mass (5) and the support (2). . 8. Device according to any one of the preceding claims, the interposition piece (31) comprising at least one attachment portion (34) on one of the pendulum masses (5), the fixing portion (34) comprising at least two fixing lugs (36) and a reinforcement (45) connecting these two lugs (36). 9. Device according to any one of the preceding claims, the raceway (13) defined by the pendulum body (3) being defined by the connecting member (6). 10. Device according to any one of the preceding claims, the first pendulum mass (5) carrying at least one interposition piece (31) arranged to prevent contact in the axial direction (X) between this first mass. pendulum (5) and the rolling member (11), and the second pendulum mass (5) carrying at least one interposition piece (31) arranged in such a way as to avoid coming into contact in the axial direction (X) between this second pendulum mass (5) and the rolling member (11). 11. Device according to claim 10, each interposer (31) comprising a housing (50) cooperating with a respective axial end (51) of the rolling member (11) during all or part of the movement of the rolling member (11) along the rolling track (13) defined by the pendulum body (3). 12. 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 disc, comprising a damping device (1) according to any one of claims 1 at 11. 13. Component according to claim 12, the support (2) of the device being one of: - a veil of the component, - a guide washer of the component, - a phasing washer of the component, or - a separate support of said veil , said guide ring and said phasing washer