KR100310561B1 - Torsion damping devices and dual flywheels for automobiles - Google Patents

Abstract

The torsion damping device comprises two coaxial parts 1, 2, circumferentially acting elastic means 4, and a friction device 5 acting axially between the two coaxial parts.

This friction device 5 has a friction ring 52 in contact with the first friction surface 61. This friction device 5 is a unitary assembly comprising at least one elastic element 50. The friction ring 52 is fixed on at least one surface of the elastic element 50. This unitary assembly 5 is interposed so as to be axially sandwiched between the first friction surface 61 and the second surface 60, while the wear preventing means is interposed between the elastic element and the second surface 60. This works. The present invention is applicable to torsion dampers for automobiles.

Description

Automotive Torsion Damper and Double Flywheels

1 is an axial cross-sectional view of a half of a torsional damper in the form of a double damped flywheel according to a first embodiment of the invention,

FIG. 2 is a partial view in the direction of the arrow 2 in FIG. 1, in which the cover plate and the annular plate shown in FIG. 1 are omitted.

3 is a cross-sectional view taken along line 3-3 of FIG. 1 showing the friction device of the torsional damper,

4-4 cross section line 4-4,

5 is a similarity of FIG. 3 showing a second embodiment of the present invention,

6 degrees cross section 6-6 section of 5 degrees,

7 is a similarity of FIG. 3 showing a third embodiment of the present invention,

FIG. 8 is a line 8-8 section of FIG. 7,

9 is a similarity diagram of FIG. 1 showing a fourth embodiment of the present invention;

10 is a similarity degree of FIG. 1 showing a fifth embodiment of the present invention,

11 is a view similar to that of FIG. 1 showing a sixth embodiment of the invention as used in clutch friction wheels.

Explanation of symbols on the main parts of the drawings

1: first rotating body 2: second rotating body

4: elastic means 5: friction device

15: annular joint 16: central hub

29, 129, 229: outer hub 50, 150, 250, 350: elastic elements

51, 52, 151, 352: friction ring 56, 156, 256: opening

The present invention relates to a torsion damping device, which is also called variously, such as a torsion damper, and is particularly used in automobiles and is mounted such that one can make limited relative rotation relative to the other against the operation of the circumferentially acting elastic means A torsional damping device of the type comprising two coaxial components, wherein the torsional damper comprises a friction device acting axially between the two coaxial components.

The damper of the type described above is disclosed in the specification of GB 2 160 296A, in which one of the coaxial parts comprises a first flywheel with a central hub and the other coaxial part It consists of a second flywheel having a plate with an outer hub therein, the outer hub partially surrounding the central hub of the other coaxial component. A circumferentially actuated torsional damper couples the first flywheel to the plate of the second flywheel.

This friction device has a friction ring acting axially between the first flywheel and the second flywheel and in frictional contact with a first lateral friction surface which is fixed relative to the first flywheel through one side thereof. The device also has a Belleville ring and an application ring that are rotationally driven with no gap at all by engaging a set of spacer bars that are part of the torsional damper.

Thus, the friction device exerts a biasing or pressing force on the spacer bar. This spacer bar is quite long and may adversely affect the solidity of the torsional damper. Moreover, the effective area of the friction surface may not be as large as desired because it is locally obstructed by the passages fixing the spacer bars, while the application ring is large and the cost is also increased.

Moreover, the friction device consists of a number of separate components, which complicates their assembly process and also acts permanently between the two coaxial components of the torsional damper, providing a constant friction damping effect on the first friction surface. do.

It has a small damping effect at the onset of relative angular displacement between the first coaxial component and the second coaxial component, but has a larger (frictional) damping effect during each subsequent stage of displacement. It may be desirable. In such cases it would be desirable to allow the friction means to act with a variable gap.

According to the disclosure of British Patent Application No. GB 2 160 296A described above, the object is achieved by installing a loose engagement structure between the application ring and the space bars of the torsional damper. However, such a structure needs to prevent rapid wear of the friction device.

It is an object of the present invention to overcome the above-mentioned drawbacks in a simple and economic manner.

It is a further object of the present invention to provide a novel friction device which is very easy to fit and has a continuous friction surface while providing variable damping and a long service life.

According to the invention, a relative rotational movement between the first part and the second part is achieved by mounting the first part, the second part, and one of the first part and the second part coaxially with respect to the other of them. Means for permitting, circumferentially actuated elastic means disposed between the first part and the second part to resist the relative rotational movement, and disposed between the first part and the second part Axially acting therebetween and including a friction device; One of the first component and the second component forms a first side surface, the friction device having at least one friction ring having a side in frictional contact with the first side surface, the friction device being elastic A unitary assembly further comprising at least one element of material, said at least one friction ring being placed on and secured to a first axial face of said elastic element and in frictional contact with said first side surface; The side surface is a friction surface, the other of the first part and the second part forms a second side surface, wherein the first side surface and the second side surface are arranged axially between the single assembly. And the friction device further comprises wear protection means for preventing sliding contact between the second side surface and the elastic element. The torsion damping device is provided.

According to the present invention, the friction device takes the form of a single assembly, thereby simplifying the fitting of the torsion damping device. Moreover, since the first friction surface is continuous and the second friction surface is also continuous, the torsion damping device is robust and simple, and there is no need to provide a loose engagement means between any one of the coaxial components of the friction device and the torsional damper.

The single assembly of the friction device also provides the following other beneficial effects. During the first stage of relative angle displacement between the two coaxial components of the torsional damper, the damping action is dependent on the internal damping effect of the elastic element itself which is firmly squeezed between the friction ring and the second friction surface. It is only caused by the effect is small. In this case, no relative movement between the friction ring and the second friction surface occurs. This is because a single friction assembly is sandwiched axially between two associated friction surfaces. This prevention of relative movement is achieved by securing the friction ring to the elastic element to prevent sliding between the elastic element and the friction ring.

During the relative angular movement of the second stage, the torque transmitted is increased, and the relative motion between the friction ring and the first friction surface begins to occur and the damping effect itself increases, thereby increasing the friction damping effect. In this way, variable attenuation is obtained. Such variable attenuation is particularly beneficial in the background of dual flywheels with torsional attenuation, which is desired to have a strong damping effect when passing the resonant frequency during start or stop of the internal combustion engine. According to the wear protection means, the elastic element will not wear due to the contact state with the second coaxial component. Therefore, the useful life of the torsion damper is lengthened and the number of components is also reduced.

The element made of elastic material preferably comprises an elastic element block made of a ring shape or hollowed out with at least one recess to further reduce its stiffness during the relative angular displacement of the first step described above.

The elastic element may be secured to the second lateral friction surface, for example using a suitable adhesive. However, it is preferred that a second friction ring is arranged on the other lateral surface of this element. This makes assembly much simpler. The second friction ring or means, which serves as a medium for securing the elastic element to the second coaxial component of the torsional damper, constitutes an anti-friction means provided according to the invention. This extends the useful life.

It will be appreciated that a single friction assembly may be used as a seal for the cavity at least partially filled with grease to lubricate the circumferentially actuated elastic means.

According to another feature of the invention, the friction device is fitted radially inward of the torsional damper itself.

Other features and advantages of the present invention will become more apparent from the following description of the preferred embodiments of the invention, given by way of example only with reference to the accompanying drawings.

The dual damped flywheel as shown in various forms in FIGS. 1 to 10 has a torsional damper, which is a double flywheel for use in motor vehicles. This is because the first rotating body 1, the second rotating body 2, the circumferentially actuated torsional damper and the friction device acting axially between the first rotating body 1 and the second rotating body 2 ( And 5). The first rotor 1 has a central hub 16, while the second rotor 2 comprises an annular plate 20 which supports the outer hub 29 at the radially inner end. This outer hub 29 partially surrounds the central hub 16. The torsional damper couples the first rotating body 1 to the annular plate of the second rotating body 2, and the damper plate or fixing portion 21 fixed to the annular plate 20 by the fastening means 24. Equipped.

The first rotor 1 is the torque input or driven portion of the torsion damping device, while the second rotor 2 is the torque output or drive. In this embodiment, the friction device 5 comprises a friction ring 52 in frictional contact with a lateral lateral friction surface 61 fixed relative to the second rotating body 2. Since the second rotating body 2 is mounted to the first rotating body 1 by an anti-friction bearing 3 radially interposed between the central hub 16 and the outer hub 29, the second rotating body is It is rotatably mounted on a 1st rotating body. The friction device 5 surrounds the central hub 16.

More specifically, the first rotating body 1 consists of a generally annular component, ie a hollow housing made of metal in this embodiment, which housing is generally transverse with an axially oriented flange 10 on its outer circumferential surface. Is provided with a sealed radial plate 14. The central hub 16 and cover plate 11 are part of the first rotating body 1. This cover plate 11 together with the housing forms a sealed annular cavity 15 partially filled with grease. In order to achieve this object, the cover plate 11 is sealed with a stud 12 on the flange 10 in this embodiment. 1 shows a sealing ring press-fitted between cover plate 11 and flange 10. Around the flange 10 a crown 13 of a toothed starter, which is driven in a conventional manner by a vehicle starter (not shown), is fixed.

The central hub 16 is secured to the radial plate 14 which forms the base of the housing. The radial plate will be referred to as a main plate for convenience in the following description. The central hub 16 protrudes axially from the base 14 or the radial plate 14, which in this embodiment is formed integrally with the metal housing, which is preferably produced by casting.

The first rotating body 1 is coupled to and driven by the internal combustion engine of the motor vehicle. To achieve this object, the first rotating body 1 is mounted on the crankshaft of the internal combustion engine by a screw (not shown) passing through the passage 17 formed in the central hub 16.

Since the second rotating body 2 is mounted to the input shaft of the gearbox of the vehicle through the clutch, the input shaft of the gearbox rotates together with the second rotating body when the clutch is engaged. In order to achieve this object, the annular plate 20 constitutes a reaction plate of the clutch. The remainder of the clutch has a clutch friction plate fixed in a conventional manner to the gearbox shaft to rotate with the gearbox shaft although not shown in the figure. The clutch friction plate is engaged in frictional contact with the reaction plate when the clutch is engaged. A more detailed description thereof is disclosed in the specification of GB 2 160 196A. The reaction plate 20 in this embodiment is a cast product and has a fixed surface 23 and a friction surface 22 to which the cover plate of the clutch is fixed.

The second rotor 2 also has an annular damper plate (referred to above as a fixture) 21. The damper plate 21 is made of metal in this embodiment and is rotatably coupled to the reaction plate 20, and axially between the cover plate 11 and the base 14 of the housing of the first rotating body. Extend into a cavity 15 disposed therein. The damper plate 21 is part of the torsional damper, which is integrally formed with the outer hub 29 in this embodiment and protrudes therefrom in the axial direction. The cover plate 11 extends radially inward to surround the outer hub 29 and is fitted around the outer hub with a gap sufficient to prevent grease from leaking from the cavity 15.

The damper plate 21 of the torsional damper is formed with a radial arm 31 (shown in FIG. 2) interposed between and supporting the circumferentially acting elastic means 4 which is part of this torsional damper. In this embodiment the elastic means 4 comprise a plurality of coil springs 4 of considerable length supported against the protruding insert 32. The inserts 32 are arranged in opposing pairs and fixed to the cover plate 11 and the main damper plate 14 by, for example, sealed rivet joints or welding. The insert 32 is part of the torsional damper as in the case of the arm 31. The insert 32 is slotted to cooperate with a thrust pad that is coupled to the distal end of the spring 4. In this embodiment, the spring 4 is mounted so that there is no gap between it and the insert block 32 but with a predetermined gap with respect to the arm 31. As another example, the spring 4 may be mounted without a gap relative to the arm 31, depending on the desired application. The spring 4 extends to the inner circumferential surface of the flange 10 and is lubricated by grease in the cavity 15 so that its useful life is increased.

The friction device 5 surrounds the central hub 16 on which the antifriction bearing 3 is mounted. In this embodiment, this bearing means is a ball bearing having a single ball race. However, in a variant this bearing 3 may consist of a bearing having two ball races as disclosed in the specification of published British patent application GB 2 160 296A, and may be made of a suitable anti-friction material (anti It may also comprise a journal bearing made of friction material.

This bearing 3 is radially interposed between the central hub 16 and the outer hub 29 fixed to the reaction plate 20. This outer hub 29 is supported on the reaction plate 20 by the fastening means 24 described above. The outer hub 29 extends far to the inner circumferential surface of the reaction plate 20 and has an inner bore in which a shoulder is formed to engage the outer ring of the bearing. The outer ring of the bearing is coupled in the bore of the outer hub 29 and is positioned axially on the outer hub 29 by the shoulder and the radially inward extension 26 of the reaction plate 20 described above.

Some of the bearings 3 are axially on the central hub 16 by means of radial rings 28 and by means of shoulders (shown in FIG. 1) formed by changes in the outer diameter of the central hub 16. Position is set. The head of the fixing screw described above, which secures the central hub 16 to the crankshaft of the internal combustion engine, is supported on the radial ring 28. Thus, the second rotating body 2 is located axially on the first rotating body 1, but is rotatable relative to the first rotating body by the anti-friction bearing 3.

The friction ring 52 of the friction device 5 is in frictional contact with the lateral (or radial) frictional surface 61 (also called the first frictional surface) through one of its surfaces. This friction surface 61 is fixed with respect to one of the two rotors 1, 2 of the flywheel (in this embodiment a part comprising the second rotor 2).

The friction device 5 forms a unitary assembly 5 comprising at least one elastic element 50 made of an elastic material. The friction ring 52 is secured to and covers at least one of the lateral surfaces of the elastic element 50. The single assembly 5 is interposed between a first friction surface 61 and a second surface 60 fixed to the other one of the two parts of the flywheel (in this embodiment, the first rotating body 1) and the shaft Gripping in the direction. In addition, anti-wear means can act between the second friction surface 60 and the elastic element 50 such that no slip occurs between the second friction surface 60 and the elastic element 50.

In this embodiment the radial carrier plate element 59 is continuous and extends radially inwardly with a slight axial deviation to the main damper plate 14. Is formed on This carrier plate element 59 is in axially opposed relationship with the first friction surface 61. This carrier plate element 59 is part of an annular centering nose projecting from the main damper plate 14 and axially oriented towards the outer hub 29. The carrier plate element 59 also has a central hub 16 integrally formed coaxially with it, and the above-described central nose is disposed on the inner circumferential surface of the main damper plate 14.

Thus, the central portion of the housing is stepped, forming a single assembly 5 by forming a protruding collar element 62 projecting axially toward the outer hub 29 on the outer circumferential surface of the carrier plate element 59. To form a radial shoulder. The opposing face of the annular outer hub 29 oriented towards the carrier plate element 59 is concave. As shown in FIG. 1, in this embodiment the second friction surface 60 extends transversely and is laterally opposed to the carrier plate element 59 oriented towards the outer hub 29. Is formed. On the other hand, the first friction surface 61 is formed with the side facing surface of the outer hub 29 oriented towards the carrier plate element 59 and extends laterally in this embodiment.

1 to 4, the single friction assembly 5 is in the form of an annular block 50 made of an elastic material (in this embodiment, an elastomeric material such as rubber). In addition to the friction ring 52, there is also another friction ring 51 in this embodiment, which is arranged to cover each lateral facing surface of the block of elastomeric material so that the corresponding friction surfaces 60, 61 ) To be in frictional contact with This friction device 5 is fitted radially inward of the damper plate 21, the elastic block 50 of which constitutes a ring thicker than the elastic rings 51, 52.

The second side friction surface 60 is also a friction surface whose outer limit is set by the annular collar element 62. As mentioned above, the outer hub 29 defines a first friction surface 61 in which recesses are formed to set an outer limit by the axially oriented annular shoulder 63.

In this way, the collar element 62 and shoulder 63 act together as a central means to prevent displacement of the single assembly 5 due to centrifugal forces and to facilitate easy fitting of the assembly 5. The cavity 15 is also sealed by a single assembly 5 under the cooperation of the outer hub 29 and the central noses 59, 62 of the housing. The friction rings 51, 52 (which are identical to each other in this embodiment) can be fixed to the elastic block 50 by adhesion, or in the variant by bonding. Fixing by bonding may be performed by vulcanizing the rubber of the block 50 in situ on the metal rings 51, 52. It will be appreciated that these rings 51, 51 constitute the wear protection means described above which prevents the occurrence of the predetermined sliding contact between the elastic block 50 and each friction surface 60, 61.

The elastic block 50 is best shown alone in FIGS. 3 and 4. It is preferable that this elastic block is provided with the at least 1 recessed part which may take various forms. In this embodiment, this elastic block consists of a series of openings 56 radially outwardly as shown in the figure. The opening 56 is radially oriented and is in the shape of a blind hole (in the present embodiment, truncated conical) and open at the outer circumferential surface of the block 50. This opening reduces the axial and circumferential stiffness of the ring 50.

The above-mentioned double damped flywheel is operated in the following manner.

When the vehicle moves, first, the housing 4 and the cover plate 11 are displaced in the circumferential direction with respect to the arm 31 so as to displace the spring 4 until the thrust pad 41 comes into contact with the arm 31. ) Is compressed to couple the first rotating body 1 to the reaction plate 20 in the circumferential direction. The relative angular displacement between the two rotors 1, 2 is limited by the mutual coupling of the windings of the spring 4.

The friction block 50 is axially compressed between the two friction surfaces 60, 61 while the first rotation 1 is angularly displaced relative to the second rotation 2. Initially some damping effect is given without any relative movement of the friction assembly 5 relative to the friction surfaces 60, 61. This slight damping effect is due to the internal damping of the rubber of the block 50 which is tightened between the opening 56 and the two rings 51, 52.

As the relative angular displacement between the two rotors 1, 2 is increased, the transmitted torque will be increased and the damping effect will also be increased. A clear relative motion will then occur between the single friction assembly 5 and one of the friction surfaces 60, 61, whereby a friction damping effect will occur.

During start-up or stop of the internal combustion engine, the rotational speed passes the resonance frequency of the double flywheel, and a large angular displacement is generated between the first and second rotational bodies, so that the friction device 5 has a high-damping effect by friction. And one of the rings 51, 52 is in frictional contact with one of the surfaces 60, 61.

Thus, some damping effects are available for damping vibrations when the internal combustion engine is idling, while much larger due to the large relative angular displacements between the rotors 1 and 2, especially when the internal combustion engine of the vehicle is stopped and started. The friction damping effect can be used.

5 and 6, the opening of the annular block made of elastic material may be oriented in the axial direction. Blocks 5 and 6 are indicated by reference numeral 150, and openings are indicated by reference numeral 156. In this embodiment, the openings 156 are open and generally in the form of blind truncated conical holes, but in this case each opening is connected to the metal ring (ring 51 of FIG. 1) in frictional contact with the friction surface 60. Corresponding] is opened in the axial direction through the hole 155 formed in. Three blocked holes are closed by the other friction ring 52.

7 and 8, in this embodiment the block 250 of elastic material functions the same as the openings 56 of FIGS. 3 and 4 or the openings 156 of FIGS. Has a single outer groove 256 to replace it. In all the figures of FIGS. 4-8, the ring blocks 50, 150, 250 are easily manufactured by molding.

It will be appreciated from the above description that the operation of the torsion damping device is reliable. Thus, if a gripping action occurs on one of the friction surfaces 60 or 61, the torsion damping device can be operated to generate friction on the other friction surface without any wear occurring in the block.

Of course, the present invention is not limited only to the above-described embodiment. As an example, another embodiment of three kinds is shown in FIGS. 9 to 11. Referring first to FIG. 9, the damper plate 21 has an L-shaped cross section, the center portion 121 of which is tubular, and is fixed to the reaction plate 20 by the studs 24. In this embodiment, the reaction plate 20 is integrated with the outer hub 129 supported on its inner circumferential surface.

The outer hub 129 forms a centering nose of the central portion 121. The ring 126 supported on the outer hub 129 is fixed to the hub 129 by a screw 127. The ring 126 thus forms a shoulder for the outer bearing ring of the bearing 3, which is positioned axially by the inner shoulder of the outer hub 129. In this embodiment, the metal-to-metal frictional contact is made at the height of the carrier plate element 59, whereby the carrier plate element 59 is preferably made of a metal sheet but the outer hub 129 is produced by casting. It is preferable. As described above, during the useful life of the torsional damper, friction may occur at one of the two friction surfaces 60, 61 and then at the other friction surface. This friction may vary with friction conditions that change over time. In this case, it will be appreciated that the collar element 62 is sufficient to center the single block 5 so that the shoulder 63 of FIG. 1 is omitted.

In the embodiment shown in FIG. 10, the single assembly 5 consists simply of blocks 350 of elastic material. This block preferably has an opening. The friction ring 352, which lies on the surface of one of the sides of the block 350, is in frictional contact with the appropriate side of the outer hub 229, which is also integrated with the reaction plate 20 as in the ninth degree. It is.

The outer hub 229 extends further in the axial direction than the hub 129 of FIG. 9, and the friction surface 160 of the first rotating body 1 of FIG. 10 is facing the reaction plate 20. 14) is formed to the side. The block 350 is preferably fixed to the main damper plate 14 made of a metal sheet, for example by attachment with an adhesive or by vulcanization in situ. Thus, the block 350 does not wear and the ring 352 makes good frictional contact with the outer hub 229. In this case, a means such as an adhesive for fixing the block 350 constitutes a wear protection chatter.

It goes without saying that the torsional damper may consist of a clutch friction wheel or clutch plate. Such a structure is shown in FIG. In this figure, the friction wheel 100 is fixed to the outer circumferential surface of the flange 10 via the stud 12, which is the cover wheel 111 and the flange 10 via the stud 12. Axially fixed between). Friction pads 101 and 102 (which may be discontinuous) depend on each surface of friction wheel 100. This friction pad is arranged to be gripped in a conventional manner between the pressure plate of the clutch and the reaction plate.

In this case, the cover plate 111 extends inwardly, similar to the central damper plate 221, with an additional transverse device 500 interposed between the cover plate 111 and the damper plate 221. The damper plate 221 is extended at its base so that two friction devices 5 and 500 of the type shown in FIG. 10 can act. In this type of friction device, the block 350 (preferably hollow) is fixed to the main damper plate 14 and cover plate 111 (preferably with an appropriate adhesive), and more precisely Fixed to its associated side 160, 161.

The damper plate 221 is fixed to the central hub 116, which is a separate element from the main damper plate 114. The hub 116 has a splined inner bore for rotatably coupling with the input shaft of the gearbox and thus forms part of the second part of the torsion damping device.

The main damper plate 114 and the cover plate 111 surrounding the central hub 116 with a predetermined gap constitute a guiding ring (as in the above drawings), and a window to which the spring 4 is fitted. It may be provided. This spring 4 may be manufactured in the form of a block of elastic material instead of a helical coil spring, and in some cases may be arranged to act in a stepped manner as is already known.

As can be appreciated, the present invention may include a number of applications. In all cases, a single friction assembly (s) closes the cavity 15 to act as a seal. This torsional damper is not only robust but also simple in construction.

Of course, the friction rings (or each friction ring) may be made of other suitable friction material instead of metal. 1 to 10, the single friction assembly 5 exerts an axial force on the bearing 3, which serves to supply force back in a closed loop. The central hub 16 and the outer hub have an unmachined surface for driving some kind of application ring.

This structure may be reversed. Thus, in FIG. 1, the anti-wear means provided in accordance with the present invention are formed in the damper plate 21 by fixing the block 50 made of an elastic material, for example by using or bonding an adhesive, The friction ring 52 may be kept in frictional engagement with the main damper plate 14 and the cover plate 11.

3 to 6, it is also possible to reverse the solids and hollows so that the elastic elements are split upwards and have gaps. Thus, in such a variant of the structure shown in FIGS. 3 and 4, the rings 52, 51 are joined together by a plurality of elastic material elements in the form of pads extending radially spaced circumferentially at regular intervals. May be combined. In a corresponding variant of the structure shown in FIGS. 5 and 6, the rings 52, 51 may be joined together by elastic material elements in the form of disc shaped pads.

Similarly, these rings may be connected to each other via a plurality of concentric rings of elastic material. Then an opening is formed. In FIGS. 5 and 6, another opening 156 may be opened through optional rings 52, 152. Half of the hole 155 is formed in one of the rings 52, 152 and the other half of the hole is formed in the other ring.

A block of elastic material may have its width wider than its height. Its lateral friction surfaces do not necessarily have to be arranged transversely. Thus, at least one of them may have a truncated cone shape. The unitary assembly has at least one truncated conical side, and the block itself also has a truncated conical side.

Finally, the elastic element may be a reticular elastic material that is attached after placement, regardless of whether it is split upward. For example, in the case of a concentric ring, the latter may be applied to one of the rings using a nozzle to effect bonding by an adhesive. As such an adhesive, for example, a silicone paste such as RHODORSEAL sold by Rhone-Poulenc may be used.

Claims (10)

Torsion damping device, With the first part, With the second part, Means for mounting one of the first component and the second component coaxially relative to the other of them to allow relative rotational movement between the first component and the second component; Circumferentially acting elastic means disposed between the first component and the second component to resist the relative rotational movement; Disposed between the first part and the second part and axially acting between the parts and including a friction device; One of the first component and the second component defines a first side surface, the friction device having at least one friction ring having a side in frictional contact with the first side surface, The friction device is a unitary assembly further comprising at least one element of elastic material, wherein the at least one friction ring lies on and secured to the first axial face of the elastic element and is in frictional contact with the first side surface. The first side surface is a friction surface, The other of the first part and the second part forms a second side surface, wherein the first side surface and the second side surface are configured such that the single assembly is axially gripped therebetween, The friction device further comprises wear protection means for preventing sliding contact between the second side surface and the elastic element. Torsion damping device. The method of claim 1, The unitary assembly is secured to the second side surface to form the wear protection means. Torsion damping device. The method of claim 1, The second side surface is a friction surface, The unitary assembly further comprises the at least one elastic element having the first axial face and the second axial face, a first friction ring and a second friction ring, wherein the first friction ring and the second friction ring Are respectively placed on each of the first and second axial faces and in frictional contact with the first and second side surfaces, respectively, The second friction ring forms the wear protection means and the first friction ring forms additional wear protection means between the first side surface and the elastic element. Torsion damping device. The method of claim 1, The elastic element includes an annular block of elastic material having at least one recess therein. Torsion damping device. The method of claim 4, wherein The at least one recess includes a plurality of radially oriented blocked holes that open along the radial outer circumferential surface of the block. Torsion damping device. The method of claim 4, wherein Two friction rings, one provided on each of the first axial face and the second axial face, wherein at least one of the two friction rings is formed with a through hole, and the at least one recess is axially oriented; A plurality of blocked holes, each of which is axially open through each of the through holes; Torsion damping device. The method of claim 4, wherein The at least one recess includes a groove formed around an outer circumference of the elastic block. Torsion damping device. The method of claim 1, The torsion damping device constitutes a torsion damping dual flywheel, wherein one of the first component and the second component comprises a first flywheel having a radially inner circumference and the other of the first component and the second component. Includes a second flywheel, the first flywheel having a second side surface proximate a central hub at the radially inner circumference, and the second flywheel comprising an annular plate having an outer hub proximate the radially inner circumference. And the first side surface is formed on an outer hub partially surrounding the central hub, the friction device surrounds the central hub and the torsion damping device is positioned radially between the outer hub and the central hub. Further comprising anti-friction bearing means Torsion damping device. In a double flywheel with a torsion damping device according to claim 8, A first component comprising a housing and a cover plate secured to the housing, the housing and the cover plate together forming an annular cavity, the circumferentially acting elastic means mounted in the annular cavity, the annular cavity being internal A main part, the friction device being disposed in the inner circumference of the cavity to seal-close the cavity Double flywheel. The method of claim 1, The torsion damping device constitutes a clutch friction wheel, and includes a housing, a cover plate fixed to the housing, and a central damper plate disposed between the housing and the cover plate, wherein the single friction device includes the damper. Partially disposed between the plate and the housing and partially between the damper plate and the cover plate. Torsion damping device.