FR2736120A1 - DOUBLE DAMPER FLYWHEEL, IN PARTICULAR FOR MOTOR VEHICLES - Google Patents

Abstract

The double damping flywheel comprises a first mass (1), a second mass (2) mounted journalling on the first mass (1) using bearing means (3), and an elastic device (5) for elastically coupling the second mass (2) to the first mass (1) in which said elastic device is hingedly mounted, on the one hand, on the first mass (1) via first axes (7), and, on the other hand part, on the second mass (2) via second pins (6) and in which one of the first (1) and second (2) masses carries at its outer periphery a starter ring gear (8). The starter ring gear (8) carries one of the first (7) - second (6) axes, called the first series of axes. Automotive vehicle application.

Description

The present invention relates to double damping flywheels, in particular

  for motor vehicles, comprising a first mass adapted to be rotatably connected to a driving shaft such as the crankshaft of a vehicle engine, a second mass mounted journalling on the first mass by means of bearing, such as a ball bearing, and adapted to form the reaction plate of a friction clutch adapted to be releasably connected in rotation to a driven shaft, such as the input shaft of the box.

speeds of a motor vehicle.

  Such a double flywheel is described in document SAE TECHNICAL PAPER SERIES 950893 relating to the conference of

  Strait from February 27 to March 2, 1995.

  In this document there is provided an elastic damping device implanted radially above the bearing means for elastically coupling the second mass to the

first mass.

  This elastic device comprises elastic members of generally radial orientation mounted to articulate, on the one hand, on the first mass by means of first axes, and, on the other hand, on the

  second mass via second axes.

  In addition, in this document, one of the first and second masses carries at its outer periphery a crown of

starter.

  This double steering wheel gives satisfaction.

  The Applicant has wondered whether it is not yet possible to increase the angular displacement between the two masses by further increasing the radial length of the organs

elastic.

  The present invention aims to meet this desire. According to the invention a double damping flywheel of the above-indicated type is characterized in that the crown of

  starter carries one of the sets first - second axes.

  Thanks to the invention the axes are carried by the starter ring so that it is possible to further increase the length of the elastic members of the device

elastic double flywheel.

  Of course the other axes are mounted

  preferably at the inner periphery of the other mass.

  The axes can be borne cantilevered by the crown but advantageously the starter ring is secured to a holding part of the axes associated with the

starter ring.

  More precisely, the first mass or the second mass concerned has at its outer periphery a radial flange directed radially outwards and fragmented into

  circumferential orientation tabs.

  This radial flange forms a spacer between the starter ring and the axle holding member associated with said ring. To do this, this edge is offset axially

towards the other mass.

  These tabs alternate circumferentially with notches in which axially extend said axes carried by the starter ring and by the piece of

maintaining the axes.

  It is thus formed a laterally delimited screed

  by the starter ring and the axle holding piece.

  This holding part is advantageously attached to the legs

  radial rim for example screwing, welding or others.

  Advantageously rivets or bolts pass through the radial flange to connect the starter ring to said

holding piece.

  It will be appreciated that this part stiffens the radial flange because advantageously it connects two legs

radial rim.

  This holding piece can come closer to the other mass and have a connecting fold to an axially oriented ring gear engaged on the edge of

legs of the ledge.

  Thus this holding piece, in combination with the rim, increases the inertia of the double steering wheel and the

formation of a screed.

  The following description illustrates the invention in

  FIG. 1 is a view in axial section of a double flywheel according to the invention; said cut passing through the cassettes and outside the cassettes; - Figure 2 is a view showing on a larger scale the upper part of Figure 1; - Figure 3 is a view showing on a larger scale the lower part of Figure 1; FIG. 4 is a schematic exploded view showing one of the cassettes of the device of the double damping flywheel of FIG. 1; Figures 5 and 6 are views showing alternative cassettes of the elastic device; FIG. 7 is a view showing a spring of

  traction can be mounted in the double steering wheel.

  In these figures, the double damping flywheel comprises two coaxially mounted rotating elements 1, namely a first rotating element 1 adapted to be rotatably connected to a driving shaft and a second rotating element 2 mounted journalling on the first rotating element.

using bearing means 3.

  This flywheel further comprises an elastic damping device 5 implanted radially beyond the bearing means 3 to elastically couple the second element.

  rotating 2 to the first rotating element 1.

  This elastic damping device 5 comprises elastic members 54 (FIGS. 1 to 4) 154 (FIG. 5), 254 (FIG. 6), generally of radial orientation, mounted to articulate, on the one hand, on the first rotary element 1 by via first axes 7 and secondly on the second rotating element 2 via second

axes 6.

  One of the first 1 and second 2 rotating elements

  carries at its outer periphery a starter ring 8.

  In Figures 1 to 3 it is the first rotating element 1 which carries at its outer periphery the starter ring 8. Of course the opposite is possible as described for example in the document FR-A-2 598 475, the second rotating element 2 then carrying at its outer periphery said

crown 8.

  The elastic members of said device 5 are usually regularly distributed circumferentially. In FIGS. 1 to 4, the elastic device 5 comprises, for example, four cassettes 5 distributed regularly circumferentially, for example in the

  SAE document 950893 cited above.

  Each cassette 5 of radial orientation comprises two guide pieces 51,52 disposed on either side of a web 53. The parts 51,52 have two first housings 57 arranged vis-à-vis each of a second housing 58 that has the sail 53. Here the housings 57,58 consist of windows and are used for mounting the two elastic members 54 in the form of helical springs extending in parallel

between them.

  The windows 57 have lips to retain the springs 54. Alternatively the housing 57 may consist of stampings. The web 53 carries, at its inner periphery, radially below the springs 54, a bushing 56 internally coated with a bearing for hinged mounting on the second axis 6 concerned implanted at the inner periphery of the second rotating element 2, while that here the piece 52 carries at its outer periphery, radially beyond the springs 54, a sleeve 55 internally coated with a bearing for hinge mounting on the first axis 7 concerned implanted at the outer periphery of the first rotating element 1. For the rest position of the double damping flywheel the axes 6, 7 are radially aligned, but it is not necessarily so, the axes 6 and 7 may be slightly offset circumferentially relative to each other for said rest position. During the relative movement between the two rotating elements, the cassettes incline with compression of the springs 54 and

  obtaining a progressive characteristic curve.

  The web 53 acts by pulling on the upper end of the springs 54, while the guide pieces 51,54

  act by pulling on the lower end of the springs.

  Each cassette therefore has tie rods 51,52-53 mounted head to tail. Of course it is possible to increase the number of springs 54 per cassette, three springs can for example

to be provided.

  It will be noted that the guide pieces 51, 52 are fastened laterally with each other, the washer 52 having a flange 59 axially offset with respect to its main part for contact with the lateral edge of the piece 52 and vice versa. The lateral fastening of the two pieces 51, 52 can be made by riveting (the holes for the passage of the rivets

  being visible in Figure 4) and / or by welding.

  Of course a spring 154 may be provided by cassette (Figure 5). In this case a part 152, having at its inner periphery a sleeve for mounting on one of the pins 6, acts via an outer sleeve 155 and a washer 157 on the upper end of the coil spring 154 of rectangular section, while a part 151, having at its outer periphery a bushing for mounting on one of the axes 7, acts via an inner sleeve shoulder on the lower end of the spring 154 admitted to to be compressed in service until coming to turns

of 154.

  In this embodiment, the number of cassettes 5 can be increased, which in any case depends on the applications. Of course instead of helicoidal springs, it is possible to use blocks of elastic material 254 (FIG. 6), for example a cage-shaped part 253 carrying in its upper part a socket for mounting on one of the pins 7, while a rod 252 secured to a washer 252 is mounted inside the cage 253 and passes through the latter and said block 254 to carry at its lower part a bushing for mounting on one of the axes 6. The blocks 254 are so tablets

in use.

  Instead of using tie rods mounted head-

  spade (FIGS. 4 to 6) the springs 354 (FIG. 7) can be mounted on the shafts 6 and 7 by means of an end loop

and work in traction.

  In the figures shown, the double steering wheel is intended to equip a motor vehicle and its elements

  Turns 1,2 consist of masses.

  In Figure 1 the first mass 1 (the first rotating element), perforated (bored)) centrally, is intended to be fixed by fasteners 15, here screws with hollow head, on the crankshaft of the engine of the vehicle, while that the second mass 2 (the second rotating element) forms the reaction plate, pierced (bored) centrally, a friction clutch to be linked disengageably

  to the input shaft of the gearbox.

  Thus, the friction surface of the reaction plate 2, usually made of cast iron, for contact with one of the friction linings of the friction disk of the clutch, not shown, as well as the clutch mechanism intended by its cover to be fixed to the outer periphery of the mass 2 by means of screws, one of which

  is visible in the upper part of Figure 1.

  Conventionally the clutch mechanism comprises a diaphragm bearing on the cover to solicit a pressure plate, rotatably connected to the cover with axial mobility by means of tangential tongues, to the reaction plate in order to tighten the friction linings of the disc friction between said trays of

pressure and reaction.

  The clutch is thus normally engaged the torque being transmitted to the friction disk set in rotation on the input shaft of the gearbox using a splined hub. To disengage the clutch action is taken by pulling or pushing on the end of the fingers of the diaphragm to stop its clamping action on the friction disc and

release this one.

  Here the first mass 1 comprises a plate 10 parallel to the reaction plate 20 to provide space

  between said cassettes 5 or springs 354 described above.

  The plate 10, here made of moldable material such as cast iron or an alloy based on aluminum, has at its inner periphery holes 13, here by counterbore, for passage

  fixing screws 13 and support of their head.

  The mass 2 generally has axial coincidence with the holes 13 of the passages 23 for access to the heads of the screws

  13 and screwdriving tool passage 15.

  Radially below the passages 23, intervene the bearing means 3, here a ball bearing alternatively a sliding bearing. This bearing 3 is interposed radially between the inner periphery of the mass 2 (the central bore thereof) and the outer periphery of a hub 11 carried centrally, here in one piece, by the plate 11. hub 11, axially oriented, defines the central opening (or central bore) of the plate 10, in which penetrates

  the end of the input shaft of the gearbox.

  A friction device 4 with axial action is interposed between the bearing 3 (the inner ring thereof) and a transverse shoulder 45 that the hub 11 has in the vicinity of its rounded connection area to the flange 10 of transverse orientation. This shoulder 45 offers a friction face to a friction washer 44 interposed between said shoulder 45 and a metal application washer 43 rotatably mounted on the hub 11 by means of internal radial tabs engaged in complementary grooves formed at the end. external periphery of the hub 11. An elastic washer with axial action 42, here a washer Belleville alternatively a corrugated washer, bears on a washer 41 for action on the washer 43 and clamping the washer 44 between the shoulder 45 and the washer 43. The washer 41 serves as a bearing washer to the inner ring of the bearing 3 fitted on the hub 11 and fixed axially in the other direction by a circlip 31 (FIG. 3) engaged in a groove made in the free end of the hub 11 penetrating into the central opening of the mass 2. The washer 44 has at its outer periphery external radial tabs engaged, possibly to play, da ns axial grooves practiced

  in the internal bore of the mass 2.

  The outer ring of the bearing 3 is mounted in the internal bore of the mass 2 being wedged axially in one direction by a shoulder 33 of the mass 2 and in the other direction by a circlip 32 engaged in a groove of the bore

internal mass 2.

  During the relative movement of the mass 2 relative to the mass 1, the washer 44 is driven, possibly after catching a game, in rotation, thanks to its outer legs, by the mass 2 and thus rubs against the shoulder 45 and the washer 43 with appearance of a friction tared by the

washer 42.

  This being recalled, to increase the length of the elastic members 54,154,254,354 according to the invention the starter ring 8 carries one of the first axes sets

  7 - second axes 6 hereinafter referred to as the first series of axes.

  In Figures 1 to 4 the ring 8 is carried by the outer periphery of the plate 10. It is engaged by hooping on a bearing surface 18 that has the plate 10 at its outer periphery. This scope 18 is cylindrical while being

  of axial orientation and forms the edge of the plate 10.

  In a manner known per se, the ring 8 is heated (expanded) to be mounted on the bearing 18 and thus be fixed to the plate 10. Of course it is also possible to weld the ring 18. The plate 10 has a characteristic of the invention a radial flange 12 directed radially towards

  the outside, fragmented into elongated legs

  férentiellement. The flange 12 thus offers a shoulder to the crown 8 (FIG. 3) and is connected by an annular zone

  axial orientation 17 to the plate 10.

  Thus the flange 12 is offset axially relative to

  to the plate 10 and in the direction of the second mass 2.

  The flange 12 forms a spacer between the ring 8 and an annular piece 9 for holding the pins 7 carried by the ring 8. The holding piece 9 is integral with the

  crown 8 being metallic, here sheet.

  More specifically, this holding part comprises a washer 91, of transverse orientation, and an annular ring 93 of axial orientation connected by a fold 92.

  axial orientation to the washer 91.

  The fold 92 makes it possible to increase the inertia of the double

  flying and surrounds the outer periphery of the second mass.

  The ring 93 is centered by the outer edge 16 of the

  circumferential lugs of the flange 12.

  The washer 91 is fixed for example by screwing or welding the tabs of the flange 12 by being leaned against said tabs. Thus the piece 9 is secured to the crown 8 through

on the legs 12.

  Here, alternating with the pins 7, rivets 19 fix together the ring 8 and the washer 91, the rivets 19 passing through the tabs of the flange 12, as shown in FIG.

dotted in Figure 1.

  The shaft 7 is forced into a passage 80 in the ring 8 and in a passage 94 of the holding part 9

  metal, here advantageously sheet metal.

  Thus the crown 8 and the piece 9 form the wings

  a clevis connected together by the flange 12.

  More precisely at the axes 7, no tab of the flange 12 is present (Figure 2). The legs of the ledge

  12 alternate with slots housing cassettes 5.

  Thus the axes 7 extend in favor of said indentations. The axes 6 are located at the inner periphery of

  the second mass 2 at the level of the passages 23.

  Here the centers of the axes 6 are located on a circumference of diameter greater than that of the centers of the passages 23, but this is not always the case. Depending on the applications, the centers of the axes 6 and 23 can

  be implanted staggered on the same circumference.

  The second shafts 6 extend cantilevered with respect to the mass 2. These second shafts have a portion 64 forming a pivot for the bushing 56, a collar 63 in contact with the face of the mass 2, facing the plateau 10, and a rooting portion 65 engaged in a passage 24 of

fixing the mass 2.

  This rooting portion 65 has a central blind hole end 61. In coincidence with this fastening passage 24 the first mass has a hole 14 formed in the

inner periphery of the plate 10.

  As will have been understood, thanks to the passages 14, it is possible to introduce a counter-tool into these against which the free end of the pivot 64 will come to rest. a punch to flow the material surrounding the hole 61 to form tabs (or flange) 62 for axial retention in a direction of

axis 6.

  Of course the passage 24 of the mass 2 is chamfered at its end turned away from the plate 10 and the flange 63 to receive the material of the flowing portion 65 outwardly, the hole 61 being widened. Thus the shafts 6 are force-fitted in the passages 24 and wedged axially in both directions in favor

  collar 63 and legs or flange 62.

  Thus we obtain a double flywheel very reliable and a long life, because the axes 6, subjected to rough

  solicitations in service, do not risk to switch off.

  Of course, in a variant, the passage 24 may have a countersink forming an internal shoulder. In this case the axis 6 has a shouldered head adapted to cooperate with said shoulder for axial immobilization in a direction of the axis. To immobilize the axis in the other direction, it suffices

  to block the passage for example with a washer.

  It will be noted that the reaction plate 2 has three portions of variable thickness, namely an outer peripheral portion 27 of smaller thickness, a middle portion 26 of greater thickness than the portion 27 but of smaller thickness than the portion 25, that presents the mass

2 at its inner periphery.

  It is in this portion 25 that is formed the central bore of the mass 2 inside which is fitted the

outer ring of bearing 3.

  The portion 26 is a function of the thickness of the cassettes of the device 5. It will be noted that the cassettes 5 extend for the most part radially over the

portion 25 (Figure 2).

  This gives a double flywheel of small axial size and very robust because the inner periphery 25 of the mass 2 and the connection area of the hub 11 to the plate 10 of the first mass can have

a great thickness.

  Thanks to the invention the cassettes have a great length because the distance between the axes 6 and 7 is increased thanks to the starter ring 8 carrying the axes 7 and the notches separating in pairs the legs of the flange 12. It will be noted that the holes 14 can also be used for the passage of divers 100 integral with a fixed plate 101

(figure 1).

  Thus it is possible to place the plate 10 on the plate 101 and to engage the plungers 100 in the passages 14. These plungers 100 are allowed to penetrate inside the casings 56. Thus, the springs 54 can be preloaded in advance. ie lengthen the length of the cassette 5, then it suffices to present the second mass 2 and to engage the

  pivots 64 thereof in contact with the plungers 100.

  These plungers 100 are subjected to the action of elastic means with axial action such as coil springs 102 engaged in the bottom of the blind holes 103 for guiding the plungers 100, said holes being formed in the plate 101. Thus when one continues the movement of assembly of the first to the second mass, one escamote the divers and this automatically so that it facilitates the

  mounting the resilient members 54,154,254,354.

  Of course the present invention is not limited

  to the embodiment described. As mentioned above

  above it can reverse the structures, the second mass 2 then carrying at its outer periphery the starter ring bearing the hinge pins for the elastic device, and at the outer periphery of the second mass 2, while axes are implanted at the inner periphery of the plate being carried by it and having the shape of the axes 6 of Figure 2. The axes carried by the starter ring 8 can be of the type of the axes 7 of Figure 2 or in

  variant be carried cantilevered.

  Of course the holding part 9 may be free of folds 92 and its washer 91 may not be continuous and extend into sectors linking between it two legs

from the edge 12.

  Preferably the washer 91 is continuous for a

  better stiffening of the rim 12.

  Thus the piece 9 forms a crown 93 and a cover 91 for the tabs of the flange 12. It stiffens the flange 12 while allowing good ventilation because at the notches separating two by two the tabs of the flange 12 a clearance exists between the crown starter and crown 93 (FIGS. 1 and 2). This ventilation is favored by the holes 14. Of course, it is possible to make holes, as shown in dashed lines in FIG. 1 (reference 96), in the ring 93 for forming ignition targets for the

  setting, the ignition of the vehicle.

  Note that the ring 8 extends cantilevered with respect to the plate 10 outside the tabs of the flange 12

  (Figures 1 and 2) to reduce the length of the pins 7.

  As will be understood the small thickness of the portion 27 allows the washer 91 of the axle holding part 9 to come closer to the flywheel of the second mass 2

  without increasing the axial thickness of the double flywheel.

  Of course, when the structures are reversed, the second mass carries for example at its outer periphery a radial flange of the type of the flange 12 of FIG. 3. Said flange forming a spacer between the starter ring 8 and

the axis holding part.

Claims (8)

  1-double damping flywheel, especially for motor vehicles, comprising a first mass (1) adapted to be rotatably connected to a driving shaft, a second mass (2) journalled on the first mass (1) using means of bearing (3) and adapted to form the reaction plate of a friction clutch capable of being connected in disengageable manner to a driven shaft, and an elastic device (5) radially implanted beyond the bearing means ( 3) for elastically coupling the second mass (2) to the first mass (1) in which said elastic device comprises elastic members (54, 154, 544, 354) generally of radial orientation mounted to articulate, on the one hand, on the first mass (1 ) via first axes (7), and secondly on the second mass (2) via second axes (6) and in which one of the first (1) and second ( 2) masses carries at its outer periphery a courtyard starter means (8), characterized in that   the starter ring (8) bears one of the first (7) -   second (6) axes, said first series of axes.   2- Double flywheel according to claim 1, characterized in that the starter ring (8) is integral with a holding part (9) of the axes (7) associated with the starter ring (8).   3- Double flywheel according to claim 2, characterized in that the mass, carrying the starter ring (8) at its outer periphery, has at said outer periphery a radial flange (12) directed radially outward and fragmented into circumferential orientation tabs and that said flange (12) is offset   axially towards the other mass (2).   4- Double flywheel according to claim 3, characterized in that said radial flange (12) forms a spacer between the starter ring (8) and the piece of   maintaining (9) the axes (7) associated with said ring (8).   - Double flywheel according to claim 4, characterized in that said tabs (12) alternate circumferentially with notches in which axially extend said axes carried by the starter ring (8) and by the holding part (9) of axes (7) so that a yoke is formed laterally delimited by the starter ring (8) and the holding piece (9). axes (7).   6- Double flywheel according to claim 5, characterized in that said holding piece (9) has a connecting fold (92) to an axially oriented ring (93) engaged on the edge of the legs of said flange (12) of the mass (1,2) concerned.   7- Double flywheel according to any one of   Claims 1 to 6, characterized in that the other   elements, second axis (6) - first axis (7), said second series of axes, is mounted at the inner periphery of the other mass (2,1).   8- Double flywheel according to claim 7, characterized in that the second series of axes (6) extends cantilevered with respect to its associated mass, and in that this second series of axes presents a part (64) forming a pivot, a flange (63) in contact with a face of said mass (2) and a rooting part (65) engaged in a   passage (24) for fixing said mass.   9- Double flywheel according to claim 8, characterized in that the rooting portion (65) has a central blind hole end (61) whose material surrounding said hole (61) is intended to flow to serve to   the axial retention in one direction of said axes.   - Double flywheel according to any of the   Claims 1 to 9, characterized in that the first mass   (1) carries at its outer periphery the starter ring (8) and in that said ring (8) carries the first axes (7), while the second axes (6) are located at the periphery internal of the second mass (2).