Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
  • F16F15/14—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers
  • F16F15/1407—Suppression of vibrations in rotating systems by making use of members moving with the system using masses freely rotating with the system, i.e. uninvolved in transmitting driveline torque, e.g. rotative dynamic dampers the rotation being limited with respect to the driving means
  • F16F15/145—Masses mounted with play with respect to driving means thus enabling free movement over a limited range

Definitions

• the invention relates to a pendular damping device, in particular for a clutch of a motor vehicle, as well as to a manual, automatic, robotized, hybrid or electric transmission system incorporating such a pendular damping device.
• a pendular damping device is conventionally used to filter the vibrations due to the acyclisms of 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 likely in turn to generate vibrations which can pass into the gearbox and cause undesirable shocks and noise pollution there. It is therefore preferable to provide a vibration filtering device.
• the pendular damping device is conventionally fixed rigidly, by means of rivets, to a phasing washer of a torsion damping device, in particular to a clutch, a hydrodynamic torque converter, a flywheel integral with a crankshaft or a dry or wet double clutch.
• a torsion damping device is for example known as a double mass flywheel.
• the damping device can be integrated into a friction disc of the clutch.
• the pendular damping device comprises an annular support intended to be driven in rotation and several pendular bodies, mounted oscillating on the support around an axis parallel to the axis of rotation of the support.
• the displacement of a pendulum body 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 pendulum body.
• the rolling tracks of the support and of the pendulum body extend so that in service the running gear is in centrifugal and centripetal support, respectively, on said tracks.
• a pendular body is conventionally made up of a pair of oscillating masses, sandwiching the support and rigidly joined together, generally by means of a connecting member.
• the oscillating weights may be riveted to the connecting member or they may have windows in which the connecting member extends.
• the weight of the pendulum bodies has been increased. Indeed, the greater the weight of the pendulum bodies, the more said pendulum bodies are effective in filtering vibrations.
• this revaluation of the weight of the pendular bodies leads to an increase in the centrifugal forces exerted on the support.
• the support itself undergoes the centrifugal force exerted by its own weight. The combination of these high stresses leads to fragility and a reduction in the life of the pendulum damping device.
• An object of the invention is to provide a pendular damping device optimized to withstand the high stresses induced by centrifugal force without reducing the performance of said device and without increasing manufacturing costs.
• the invention proposes a pendular damping device intended to be integrated into a transmission chain of a vehicle, in particular into a clutch, comprising:
• a mobile support in rotation about an axis of rotation, and in which a window defining an upper edge and a lower edge, radially opposite to the upper edge, is provided, the upper edge of the window defining two support bearing tracks ,
• the upper edge of the window comprises an indentation located circumferentially between the two rolling members.
• the weight of the support is reduced, which makes it possible to reduce the stresses linked to centrifugal forces on the pendular damping device without reducing its filtration capacity (i.e. without reducing the weight of the pendular bodies).
• the positioning of the notch is strategically located so as not to diminish the resistance of the support.
• the support of the pendular damping device according to the invention has an optimized geometry to improve the resistance to centrifugation.
• the notch is equidistant from the two support bearing tracks;
• the zone located between the two support rolling tracks is a zone undergoing few stresses linked to centrifugal forces;
• the support comprises a single window per pendular body; this architecture is particularly suitable for a support comprising a single window per pendular body because said window causes a specific distribution of forces;
• the indentation is made on one of the edges of the window;
• the indentation is made on the upper edge of the window;
• the pendular body comprises two oscillating masses and a single connecting member pairing the two oscillating masses together;
• the connecting device matches the two oscillating weights through the support window;
• the notch is located on the window comprising the connecting member;
• the invention is particularly suited to single-window (single window) and single-spacer (single connecting member) architectures;
• the pendular body comprises two oscillating masses and two connecting members, pairing the two oscillating masses together;
• the connecting organs pair the two oscillating masses through the same window of the support;
• the notch is located on the window comprising the connecting members;
• the invention is particularly suited to single-window (single window) and bi-strut (two connecting members) architectures.
• the indentation has a concave shape; thus, this concave shape is particularly simple to produce;
• the indentation comprises two side walls and a bottom, connecting the two side walls, at least a portion of the bottom being flat; this shape of the notch makes it possible to optimize the removal of material from the support and therefore to reduce the stresses linked to the centrifugal force of the support;
• the indentation comprises two side walls and a bottom, connecting the two side walls, at least a portion of the bottom being of low curvature; this shape of the notch makes it possible to optimize the removal of material from the support and therefore to reduce the stresses linked to the centrifugal force of the support;
• the two side walls are parallel;
• the two side walls are not parallel; this shape of the notch makes it possible to optimize the removal of material from the support and therefore to reduce the stresses linked to the centrifugal force of the support;
• the two side walls are divergent; this shape of the notch makes it possible to optimize the removal of material from the support and therefore to reduce the stresses linked to the centrifugal force of the support;
• the two side walls are convergent; thus, this shape is particularly simple to produce;
• the support extends radially between a radially inner edge and a radially outer edge and comprises a solid band, said band being defined radially between a first and a second circle concentric with the axis of rotation of the support and circumferentially between a first and a second side wall, the first side wall extending radially between a first end, located at the point of contact between one of the running gear and one of the support running tracks when the pendulum body is in a rest position , and a second end, located on the radially outer edge of the support, the second side wall extending radially between a first end located at the point of contact between the other of the running gears and the other of the support raceways when the pendular body is in a rest position, and a second end, located on the radially outer edge of the support;
• the band is a zone of solid material of the support, that is to say without indentation;
• the solid band defines an area on the support on which there is no shrinkage of material, that is
• the first sidewall has a first length
• the indentation includes a radially outward first point
• the radially outer edge of the bracket includes a second point radially aligned with the first point
• the bracket has a performance line s extending between the first point and the second point, said line of performance having a second length
• the ratio of the second length to the first length is between 0.8 and 1.40; that is to say that the support has a distance, in the radial direction, of a greater solid zone at the level of the notch than at the level of the support rolling tracks;
• the performance line runs radially between the first point and the second point.
• the radially outer edge of the support comprises a cutout circumferentially close to the strip; thus the weight of the support is reduced, which makes it possible to reduce the stresses linked to centrifugal forces on the pendular damping device without reducing its filtration capacity;
• the positioning of the cutout is strategically located so as not to diminish the resistance of the support.
• the invention also relates to a component for a manual, automatic, robotic, hybrid or electric transmission system of a vehicle, the component being in particular a dual mass flywheel, a hydrodynamic torque converter, a flywheel integral with the crankshaft or a disc dry or wet clutch friction, comprising a pendular damping device according to the invention.
• the subject of the invention is a vehicle powertrain comprising: a thermal, hybrid or electric motor for propelling the vehicle, and a component for a transmission system according to the invention.
• FIG. with two running gear Figure 2 is a partial view of Figure 1 further comprising a pendular body
• Figure 3 shows the characteristics of Figure 2 with an alternative shape of the notch.
• axially means “parallel to the axis of rotation X of the support”; “radially” means “along a transverse axis intersecting the axis of rotation of the support”; “angularly” or “circumferentially” means “around the axis of rotation of the support”.
• the thickness is measured along the axis of rotation X.
• “Centrifugal support” means a support force comprising a component oriented away from the axis of rotation X.
• Vehicle means motor vehicles, which include not only passenger vehicles but also industrial vehicles, which includes in particular heavy goods vehicles, public transport vehicles or agricultural vehicles, but also any transport vehicle allowing to move a living being and/or an object from one point to another.
• pendulum body is meant a mass which is mounted in such a way as to oscillate on the support in response to the acyclisms of the engine of the vehicle.
• a pendular body is conventionally made up of a pair of oscillating masses, or “pendulum masses”, extending so as to sandwich the support and rigidly joined together.
• a pendular body further comprises at least one connecting member, also called a spacer, suitable for pairing the pair of oscillating weights with each other.
• a pendular body can also be constituted by a single oscillating mass. The single oscillating weight can be sandwiched between two supports.
• Two parts are said to be "rigidly attached” or “paired” when they are permanently immobilized in relation to each other. This immobilization may result from fixing the first part to the second part directly or via one or more intermediate parts.
• the rest position of the device is that in which the pendular bodies are subjected to a centrifugal force, but not to torsional oscillations coming from the acyclisms of the heat engine.
• Pendulum bodies are said to be "supported by centrifugal force" when the rotational speed of the support is sufficient to keep the pendulum bodies pressed radially outwards against the running gear, and through them against the support.
• a pendular damping device 10 in particular suitable for equipping a vehicle transmission system, is for example integrated into a component of such a transmission system, this component being for example a dual mass flywheel, a hydrodynamic torque converter, a flywheel integral with the crankshaft or a dry or wet clutch friction disc.
• This component may be part of a powertrain of a vehicle, the latter possibly comprising a heat engine having a predetermined number of cylinders, for example three, four or six cylinders.
• Pendulum damping device 10 comprises at least one pendulum body 13 mounted on a support 12.
• Device 10 preferably comprises a plurality of pendulum bodies 13 mounted on support 12.
• Each pendulum body 13 comprises at least one oscillating weight 14.
• each pendulum body comprises two oscillating masses 14 paired by means of at least one connecting member commonly called a “spacer” 20.
• each pendulum body 13 comprises a single spacer 20.
• each pendular body 13 comprises two spacers 20.
• Each spacer 20 can be riveted to the oscillating weights 14 of the same pendulum body 13.
• each spacer 20 can be force-fitted into the oscillating weights 14 of the same pendulum body 13.
• Each strut 20 may comprise a main body which extends radially and circumferentially, and is generally arcuate in shape.
• the main body extends radially between a radially outer upper face 21 and a radially inner lower face 22.
• the main body extends circumferentially between a first circumferential end 23 and a second circumferential end 24.
• Each of the oscillating masses 14 comprises a main body which extends radially and circumferentially, and is generally arcuate in shape.
• the main body extends radially between radially inner 6i and radially outer 6e edges of oscillating weight 14.
• the main body extends circumferentially between a first circumferential end 141 and a second circumferential end 142.
• the oscillating weights 14 are located on either and other side of the support 12 and are axially opposite.
• each pendular body 13 comprises a single oscillating weight 14 and two supports 12.
• the two supports 12 are matched by means of at least one connecting member such as a rivet positioned radially internally with respect to the pendular body or bodies.
• the two supports 12 can face each other axially.
• the oscillating weight 14 is located between the two supports 12.
• Two covers can then be positioned axially around the assembly formed by the two supports and the pendular bodies. One can thus find successively axially: one of the covers, one of the supports 12, the oscillating weight 14, the other of the supports 12, and the other of the covers.
• the support 12 can be an input element of the torsion damper, an output element or an intermediate phasing element arranged between two series of springs 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 10.
• the support 12 of the pendular damping device 10 can then be one of a component guide washer, a component phasing washer, or a separate support from said web, from said guide washer and from said phasing washer.
• the support may be secured to this flywheel.
• the support 12 can still be other, such as a flange.
• the support 12 generally has the shape of a ring consisting of a cut metal sheet, generally made of steel, of a thickness typically less than 10 mm (millimeters), preferably less than 9 mm, preferably less to 8 mm, preferably less than 6.5 mm.
• the support 12 extends axially between two opposite side faces 16.
• the two side faces 16 can be flat.
• the two side faces 16 can extend between a radially inner edge 161 and a radially outer edge 162.
• the radially inner edge 161 can be conventionally circular in shape.
• At least one window 15 passes through the support 12 along its thickness.
• Each of the windows 15 defines an empty space inside the support 12.
• Each of the windows 15 extends radially between an upper edge 151 and a lower edge 152.
• Each of the windows 15 extends circumferentially between a first side edge 153 and a second side edge 154.
• the window 15 may include an interior contour.
• the upper and lower edges as well as the first and second side edges can form said interior contour.
• the interior contour of the window 15 can be continuous with each other.
• the windows 15 can be regularly distributed over the entire circumference of the support 12.
• Each spacer 20 can pass through a window 15.
• Each spacer 20 can be entirely received in the thickness of the window 15.
• Each window 15 can be crossed by a single spacer 20 .
• Each window 15 can be crossed by two spacers 20 belonging to the same pendular body 13.
• the device 10 further comprises at least one rolling member 40, for example a roller.
• Each pendular body 13 is oscillatingly mounted on the support 12 by means of two rolling members 40.
• Two rolling members 40 can pass through a single window 15 of the support 12 and guide the movement of the oscillating weight(s) 14 of a pendulum body 13 in relation to bracket 12.
• Each rolling member 40 can roll on a support rolling track 41, integral with the support 12 when the pendulum body 13 is supported by centrifugal force.
• Each rolling member 40 can roll on a pendulum body running track 42, secured to the pendulum body 13, when the pendulum body 13 is supported by centrifugal force.
• the edges of the windows 15, in particular the upper edge 151, can define the support roller tracks 4L
• the spacer 20 can form the pendulum body roller track 42 or the pendulum body roller tracks 42 when the pendulum body 13 includes a unique 20 spacer. More particularly, the radially outer upper face 21 of the spacer 20 can form the track or tracks of the pendulum body 42.
• the shape of the support 41 and pendulum body 42 bearing tracks can be such that each pendulum body 13 is moved relative to the support 12 at the same time: in translation around a fictitious axis parallel to the axis of rotation X of the support 12 and, also in rotation around the center of gravity of said pendular body 13, such a movement being also called “combined movement” and disclosed for example in application DE 10 2011 086 532.
• the shape of the aforementioned support 41 and pendular body 42 rolling tracks may be such that each pendulum body 13 is only moved relative to the support 12 in translation around a fictitious axis parallel to the axis of rotation X of bracket 12.
• the pendular body rolling track 42 may have a concave shape. That is, the curvature of the pendular body raceway 42 may be in a direction opposite to the curvature of the support raceway 4L.
• Each rolling member 40 can be mounted freely in a window 15 of the support 12.
• Each rolling member 40 may have a rolling surface 43, adapted to be at least partially in contact with the support rolling track 41 and the track rolling body 42.
• Each rolling member 40 can be a cylinder of constant radius.
• Each running gear 40 can be non-through.
• Each rolling member 40 can be through.
• Each rolling member 40 can only be stressed in compression between the pendular body rolling track 42 and the support rolling track 41.
• the pendular rolling body raceway 42 and the supporting rolling track 41 cooperating with the same member bearing 40 can be at least partly radially opposite, that is to say there are planes perpendicular to the axis of rotation X in which these rolling tracks both extend.
• Each rolling element 40 can cooperate with the rolling body rolling track 42 and with the supporting rolling track 41 only via its rolling surface 43 outside.
• All the pendulum body raceways 42 can have exactly the same shape between them and/or all the support raceways 41 can have exactly the same shape between them.
• the pendulum bodies 13 are preferably distributed equi-angularly around the axis of rotation X. All the pendulum bodies 13 can follow each other circumferentially.
• the device 10 can thus comprise a plurality of planes perpendicular to the axis X of rotation in each of which all the pendular bodies 13 are arranged.
• the support 12 may further comprise a notch 30.
• the notch 30 may represent a material cutout of the support 12 made in order to reduce the general weight of said support 12. This removal of material makes it possible to reduce the impact of the inherent centrifugal force to the support 12.
• the support 12 may comprise a plurality of notches 30.
• the notches 30 can be made on the inside contour of the window 15.
• at least one of the windows 15 of the support 12, and preferably all of the windows 15 of the support 12, can comprise a notch 30.
• the upper edge 151 of the window 15 may include the notch 30.
• the notch 30 can be located circumferentially between the two running gears 40. More particularly, the notch 30 can be located circumferentially between the two support rolling tracks 41 of a window 15. The notch 30 can be circumferentially more close to one or the other of the two rolling members 40. More particularly, the notch 30 can be closer to one or the other of the two support rolling tracks 4L Alternatively, the notch 30 may be circumferentially equidistant from the two rolling members 40. More particularly, the notch 30 may be circumferentially equidistant from the two support rolling tracks 4L
• the cutout 30 may include an inner contour.
• the notch 30 may comprise two side walls 31 and a bottom 32 connecting the two side walls 31.
• the bottom 32 and the two side walls 31 are continuous and represent the interior contour of the notch 30.
• the interior contour of the window 15 and the inner contour of the notch 30 may be continuous.
• At least a portion of the bottom 32 of the inner contour of the notch 30 may have a slight curvature.
• the bottom 32 can be a curve.
• the bottom 32 of the inner contour of the notch 30 may be flat.
• the entire bottom 32 can be flat.
• the two side walls 31 extend from a first end located on the inside contour of the window 15, and more particularly located on the upper edge 151 of the window 15, and a second end.
• the two side walls 31 can be parallel to each other.
• the two side walls 31 may not be parallel to each other.
• the two side walls 31 may diverge from each other. That is to say that the two half-straight lines originating respectively from the first end of each of the side walls 31 are mutually divergent.
• the two side walls 31 can converge with each other. That is to say that the two half-lines originating respectively from the first end of each of the side walls 31 converge with each other.
• At least one of the side walls 31 can be planar.
• the two side walls 31 can be flat.
• at least one of the two side walls 31 can be concave.
• the two side walls 31 can be concave.
• at least one of the two walls can be convex.
• the two side walls 31 can be convex.
• One of the side walls 31 can be one of a flat, concave or convex shape and the other of the side walls 31 can be the other of a flat, concave or convex shape.
• the notch 30 may have a concave shape, as particularly visible in Figure 3.
• the notch 30 may comprise a first point A located radially furthest outwards. More particularly, the first point A may be comprised by the interior contour of the notch 30, at the point closest to the radially exterior edge 162 of the support 12. Alternatively, the first point A may be located on the interior contour of the window 15.
• Support 12 may include a strip 50.
• Strip 50 may be a solid area of support 12.
• a solid zone is a zone which does not include any loss of material such as linked to an indentation, for example.
• the strip 50 can be defined radially between a first circle 51 concentric with the axis of rotation X of the support 12 and a second concentric circle
• the band 50 can be comprised circumferentially between a first side wall 53 and a second side wall 54.
• the first side wall 53 can extend radially between a first end 531 and a second end 532.
• the first end 531 of the first side wall 53 can be located at the point of contact between one of the running gears 40 and the one of the support rolling tracks 41, located radially opposite said rolling member 40, when the pendular body 13 is in a rest position.
• the second end 532 of the first side wall 53 can be located on the radially outer edge 161 of the support 12. A straight line passing through the first end 531 and the second end 532 of the first side wall
• the first wall 53 can intersect the axis of rotation X of the support 12.
• the first wall 53 can have a first length L.
• the second side wall 54 can extend radially between a first end 541 and a second end 542.
• the second end 542 of the second side wall 54 can be located on the radially outer edge 161 of the support 12. A straight line passing through the first end 541 and the second end 542 of the second side wall 54 can intersect the axis of rotation X of the support 12.
• the straight line passing through the first end 531 and the second end 532 of the first side wall 53 and the straight line passing through the first end 541 and the second end 542 of the second side wall 54 can intersect on the axis of rotation X of the support 12.
• the second wall 54 can have a first length L.
• the first wall 53 and the second wall 54 can have the same first length L.
• the first concentric circle 51 can pass through the second end 532 of the first side wall 53 and through the second end 542 of the second side wall 54.
• the second concentric circle 52 can pass through the first end 531 of the first side wall 53 and through the first end 541 of the second side wall 54.
• Support 12 may include a plurality of strips 50.
• Support 12 may include one strip 50 for each pendular body 13.
• the radially outer edge 162 of support 12 may include a second point B.
• the second point B may be radially aligned with the first point A.
• the support 12 may further comprise a performance line extending between the first point A and the second point B.
• the performance line may have a second length L′.
• the second length L' can be greater than and/or equal to the first length L.
• the second length L' can be less than and/or equal to the first length L.
• the second length L' can be between 0.8 and 1.4 times the first length L. More precisely, the second length L' can be between 0.85 and 1.35 times the first length L. More precisely, the second length L' can be between 0.9 and 1.3 times the first length L.
• This ratio makes it possible to define the maximum and minimum radial height of the indentation 30 with respect to the first side wall 53 and to the second side wall 54 of the solid band 50 in order to ensure optimum filtration performance of the device 1 of pendulum damping without deterioration of the resistance of the support 12.
• Support 12 may further include a cutout. More particularly, the radially outer edge 162 of the support 12 can include the cutout. The cutout may be circumferentially close to the strip 50. The cutout may be located circumferentially between two strips 50.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Aviation & Aerospace Engineering (AREA)
• Mechanical Engineering (AREA)
• Mechanical Operated Clutches (AREA)
• Vibration Prevention Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (4)

Family Cites Families (4)

• 2020
  • 2020-09-29 FR FR2009936A patent/FR3114627B1/fr active Active
• 2021
  • 2021-09-28 EP EP21777815.8A patent/EP4222391A1/de active Pending
  • 2021-09-28 CN CN202190000769.7U patent/CN220470551U/zh active Active
  • 2021-09-28 WO PCT/EP2021/076709 patent/WO2022069497A1/fr not_active Ceased

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