FR2678337A1 - TORSION DAMPER DEVICE, IN PARTICULAR FOR AUTOMOTIVE VEHICLES. - Google Patents

Abstract

The torsion damping device comprises a disc (12) associated with a counter-disc (13), a web (11), in which elastic members (17) are mounted in windows (20) formed in the disc (12) and the backing disc (13), said windows comprising two side edges (21, 22) connected to each other by two circumferential edges (23, 24), one of which (24), called the outer edge, extends radially above the other (23), called the internal rim. The lateral edges (21, 22) each have a first external deformation (26) of convex shape, projecting outwardly in the direction opposite to the web (11) connecting to the lip (34, 25) delimiting the external rim (24 ). Automotive vehicle application.

Description

The present invention relates to a torsion damping device,

  particularly for motor vehicles, of the kind comprising at least two coaxial parts rotatably mounted relative to each other, within the limits of a determined angular deflection and against elastic members, able to act circumferentially between them for a range at least of such an angular deflection, namely a first part comprising a disk and a metal counter disk, arranged axially on either side of a web belonging to the second of said parts, in which the parts elastics are mounted in windows opposite the disk and against the disk opposite apertures in the web, said windows having two lateral edges connected to one another by two circumferential edges, one of which, said outer rim, is delimited by a lip and extends radially above the other, said internal rim. Such a damper is described in the document FR-A-1 469 091 in which the windows are obtained by cutting on the one hand, a main orifice and, on the other hand, four small auxiliary holes, and then folding in form of lip the material delimited by the outer and inner edges of the main orifice and two of the holes. In this document, the shearing forms inclined slits extending from the central orifice to the auxiliary holes, so that it is possible to have large bearing areas for the elastic members. This provision is satisfactory. but may present, under severe conditions of use, disadvantages In fact, the auxiliary holes associated with the outer rim can create break primers detrimental to the resistance

  mechanical torsion damper.

  The present invention aims to overcome this disadvantage without losing the advantage of a good area

  support for elastic members.

  According to the invention, a device of the above type

  indicated is characterized in that the lateral edges each have a first external deformation of convex shape, protruding outwards in the direction opposite to the web, connecting to the lip delimiting the

outer circumferential edge.

  Thanks to the invention, the presence of the auxiliary holes is no longer essential for the outer rim and there is no shear The lips are

  enveloping and are obtained by striking the press.

  It will be appreciated that the lips and the first deformations form a stiffening rib that is favorable to the robustness of the disk and the counter-disk, so that it is possible to shift the springs a little more outwards for the benefit of better transmission of torque and / or an increase in angular deflection between the two parts of the shock absorber. According to one characteristic, the first deformation has a spherical shape and the outer rim is delimited by a centrally arcuate lip which, at each of its ends, is connected to said first deformations by two straight segments. This arrangement is very favorable and provides good resistance to external rim and side edges with

  risks of rupture very diminished.

  Indeed, thanks to the presence of straight segments there is a greater amount of matter between the

  window and the outer periphery of the disc and counter

  disc, so that the mechanical strength of

aforementioned parts is increased.

  According to another characteristic, the lateral edges have an S-shaped wafer formed by the first deformation, and a second internal deformation connecting to the first deformation being disposed radially below it, said deformation

  being protruding inward towards the veil.

  Thanks to this, it is possible to have a montage to

concentric springs.

  The description in the appendix illustrates the invention in

  FIG. 1 is a partial view of a friction disc according to the prior art, in elevation along the arrows I-I of FIG. 2; Figure 2 is a view of this disc along the broken line II-II of Figure 1; Figure 3 is a large scale view of a window according to the invention; Figures 4 to 7 are views respectively along the lines 4-4, 5-5, 6-6 and 7-7 of Figure 3; Figure 8 is a partial view on a reduced scale of a disk or against-disk according to the invention. The invention is applied here to a torsional damper in the form of a friction disc for

clutch of a motor vehicle.

  As described in the document FR-1 469 091 (FIGS. 1 and 2), this disc comprises a hub 10 intended to be coupled in rotation with the input shaft of the

gearbox.

  The hub 10 carries a metal web 11 secured thereto by crimping and axially on either side of this web are respectively disposed a disk 12 and a counter-disk 13 secured to each other by metal spacers 14, here in the form of columns, each passing through an opening provided for this purpose at the outer periphery of the web 11 The disk 12 and the counter-disk 13 are in the image of one another and differ only in their inner periphery They constitute here guide washers and belong to a first coaxial portion of the torsion damper provided with a second coaxial portion comprising the hub 10 and the

sail 11.

  The disc 12 of the first part is integral with a ring 12 'bearing friction linings, adapted to be clamped between the pressure plate and reaction of the clutch integral in rotation with the crankshaft of the engine of the vehicle for transmission of the movement of the driving shaft (the motor) to

  the driven shaft (the input shaft of the gearbox).

  Here the columns 14 also ensure the fixing of the ring 12 'to the disk 12 The two coaxial parts of the damper are rotatably mounted relative to each other, within the limits of a determined angular deflection, to the against elastic members 17 and friction means, the disc 12 and

  the counter-disk 13 surrounding the hub 10.

  The members 17 are circumferentially acting and consist of coil springs 17, or alternatively blocks of elastic material Each spring 17 is housed here in an opening 18 formed in the web 11 and in windows 19 made vis-à-vis The opening 18 consists of a window and the windows 18, 19 are provided here in facing relation and have the same dimensions, the springs 17 being housed here without a clearance in the window 12 and in the against-disk 13. said

  windows 18,19 obtained by cutting to the press.

  Each window 19, generally of rectangular shape, has two lateral edges connected to one another by two circumferential edges, one of which, said outer rim, extends radially above the other, said internal rim. outer edge is delimited by

a lip described below.

  The friction means comprise friction washers 16 interposed axially between the web 11

  and the disc 12, as well as between the veil II and the counter

  disc 13 An elastic washer with axial action of the Belleville washer type and a washer for application

  are also provided between the veil he and the counter

record 13.

  The application washer is provided with axial tabs each engaged in a hole of the counter-disk 13

  for rotational connection with it.

  The spring washer is supported on the counter

  disc 13 to urge the washer application towards the washer 16 and the veil it to induce

friction.

  During the relative angular movement between the two coaxial parts the springs 17 are compressed and a relative movement occurs between the web 11 and the disc 12 against the disk assembly 13, against the friction means, the washers 16 rubbing against the

sail 11.

  According to the invention, the windows of the disk 12 and the contradiction 13 are reinforced. Thus, a window according to the invention is referenced in FIG. 3, the lateral edges of said window 20 bearing the references 21, 22, while the edges circumferential interconnecting said lateral edges 21,22 respectively carry the reference 24 for the outer rim and the reference 23 for the internal rim disposed

radially below the other.

  In FIG. 3, the lip delimiting the rim 24

has the reference 34,25.

  Thus according to the invention a torsion damper of the type indicated above is characterized in that the lateral edges 21, 22 each have a first external deformation 26 of curved shape, projecting outwards in the direction opposite to the web 11, connecting at the lip 34, 25 delimiting the outer flange 24. According to one feature, the side edges 21, 22 have an S-shaped wafer with a first external deformation 26 projecting outwards in the direction opposite to the web 11, connecting at the outer rim 24 and a second internal deformation 27 connecting to the first deformation 26 being disposed radially below it, said deformation being protruding inward towards the web 11. The first 26 and the second deformations 27 have, according to a feature of the invention, a convex shape Advantageously, the first deformation 26 is spherical and can be seen in FIGS 30 3 and 6 the center of this sphere This deformation 26 is connected to a lip 34, projecting outwards in the opposite direction to the web 11 of FIGS. 1 and 2. It is this lip which delimits the outer rim 24 and serves to retaining the springs 17, which, under the action of centrifugal force, are allowed to bend and come into contact with said lips The material of this lip is

taken from the window 20.

  This lip comprises centrally an arcuate portion 34, here in the form of an arc-of-circle, which at each of its ends is extended a rectilinear segment 25

  each connecting to the first deformation 26.

  Referring to FIG. 7, it can be seen that rectilinear segment 25 has a rectilinear main part connecting to disk 12 (or counter-disk 13) by a circular rooting zone. In FIG. part connection

  rectilinear segment 25 with the disc 12 or the counter

record 13.

  The second deformation 27 is also spherical in shape and we see in 29 in Figures 3 and 5 the center of the sphere It extends in the middle part of the edge

lateral concerned.

  The first 26 and the second deformations 27 become entangled and it will be noted that the lip 34, 25 is obtained by pressing with the press, the disc 12 and the counter-disc 13 being here metallic. The internal rim 23 is delimited by a lip 33 This lip 33, whose material is taken from the window 20, is obtained by shearing and has a centrally machined portion 31 The lip 33 is intended to retain the springs 17 It will be noted that

  the lateral edges 21 and 22 are inclined.

  As will have been understood, these lateral edges 21, 22 provide a good seat for the springs 17, in particular thanks to their deformation 26 which can be in the form of an olive quarter. The second deformation 27 allows the assembly of a another spring, for example, with a coil (not visible) inside the spring 17, said spring

relying on training 27.

  As is evident from the

  description and drawings the lip 34,25 and the

  first deformations 26 are obtained by striking the press just like the second deformation 27 without shearing material The material is thus hardened,

  so that the edges 21,22 have a good resistance.

  It is the same with the outer rim 24 and, according to an important characteristic of the invention, there is thus continuity of material from one of the first deformations 26 to the other and it is the same with one of the second deformations 27 to the other, this continuity of matter being obtained thanks to a tortuous form of

  side edges 21,22 and external rim 24.

  All this gives the windows a great robustness while allowing them, on the one hand, to offer good support for the circumferential ends of the elastic members 17, and on the other hand, by the lip of their outer rim 24 to provide good restraint of the springs 17 when they are subjected to the effect of

the centrifugal force.

  Referring to FIG. 8, the advantages of the present invention will be better seen. Thus, there is a strip of material 42 between the root of the lip 34 and the

  outer periphery of the disk 12 and the counter-disk 13.

  The lip 34,25 with the first deformation constituting a stiffening rib It will be appreciated that, thanks to the segment 25, the quantity of material 43 present between the outer periphery of the disk 12 or against the disk 13 and the rectilinear segment 25 is increased, which increases

  the robustness of said disk 12 and counter-disk 13.

  Note that the first deformation 26 in combination with the second deformation 27 is a stiffening rib and therefore that the risk of rupture between the holes 40, for mounting the posts 14, and the side edges 21,22 are minimized. Naturally, the present invention is not limited to the embodiment shown. In particular, as described in document FR-A-2 568 640, the web 11 (which transversely forms an annular piece around the hub 10) can be mounted angularly movable relative to the hub against elastic means of low stiffness and with between them

  means of meshing with play The disc 12 and the counter

  disc 13 may consist, as described in this aforementioned document, in auxiliary sails with intervention meshing means to play between them

and the hub.

  Of course, the elastic members 17 can act only for a range of the angular displacement between the web 11 and the disc 12 against the disc assembly 13. For this purpose, the elastic members 17 can be mounted without play in the windows 20 of the disc 12 and the counter -disque 13 and with clearance in the openings 18 of the web 11 Said openings 18 may consist of indentations Of course the provisions of the aforementioned document FR-A-2 568 640 may be used. Some of the windows may be devoid of deformation according to the invention and the presence of the lip 33 associated with the inner rim 23 is not always essential. Finally the first 26 and second 27 deformations can be curved having a shape

other than spherical.

Claims (4)

  1) torsion damping device, especially for motor vehicles, of the kind comprising at least two coaxial parts rotatably mounted relative to each other within the limits of a defined angular deflection and against elastic members to circumferential action (12), able to act circumferentially between them for a range at least of such an angular deflection, namely a first portion comprising a disc (12) and a counter-disk (13) arranged axially on the metal side and other of a web (11) belonging to the second of said parts, in which the resilient members (17) are mounted in windows (20) opposite the disc (12) and the counter-disk ( 13) facing apertures (18) in the web (11), said windows having two lateral edges (21, 22) connected to one another by two circumferential edges (23, 24), of which one (24), said outer rim, is deli mité by a lip (34,25) and extends radially above the other (23), said inner rim, characterized in that the lateral edges (21,22) each have a first external deformation (26) curved, outwardly projecting away from the web (11), connecting to the lip (34,25)   delimiting the outer rim (24).   2) Device according to claim 1, characterized in that said lip (34,25) associated with the outer flange (24) comprises a central portion (34) of arcuate shape connecting at each of its ends to a straight segment (25) , connecting itself to the first deformation (26).   3) Device according to claim 2, characterized in that the first deformation (26) is spherical shape.   he 4) Device according to any one of   Claims 1 to 3, characterized in that the edges   sides (21,22) have an S-shaped wafer formed by the first deformation (26) and a second internal deformation (27) connecting to the first deformation (26) being arranged radially below it, said deformation being curved and projecting   inward towards the veil (11).   Device according to claim 4, characterized in that the second deformation (27) is of spherical shape.