CN210218547U

CN210218547U - Dual-mass flywheel

Info

Publication number: CN210218547U
Application number: CN201920372466.2U
Authority: CN
Inventors: Hui Yuan; 袁辉
Original assignee: Suzhou Hui Mei Automotive Technology Co Ltd
Current assignee: Suzhou Hui Mei Automotive Technology Co Ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-03-31
Anticipated expiration: 2029-03-22

Abstract

The utility model relates to the technical field of machinery, a dual mass flywheel is disclosed, including torsional damper, second flywheel and first flywheel, torsional damper includes: the shock absorber body comprises an outer ring and an inner ring, and the outer ring and the inner ring are respectively connected with a second flywheel and a first flywheel which rotate coaxially; the pull pin group comprises two pull pin units, and the two pull pin units are respectively positioned on the outer ring and the inner ring; and the inhaul cables are fixed and tightly attached to the pull pin group and are distributed along the radial direction of the shock absorber body. The utility model discloses first flywheel is as power input end, and the second flywheel is as power output end, from the loaded moment of power input end, transmits to power output end through dowel group and cable. The utility model discloses simple structure, wearing and tearing are few, long service life, and it is not high to require the spring, cost reduction. The utility model discloses along with the increase of power input end moment, torsional rigidity also is the forward and increases in succession thereupon, and the damping effect reinforcing.

Description

Dual-mass flywheel

Technical Field

The utility model relates to the technical field of machinery, especially, relate to a dual mass flywheel.

Background

The combustion knock of the engine causes unavoidable torsional vibrations in the rotation of the output shaft, which are detrimental to the drivetrain and can also cause vibrations and noise. To reduce this torsional vibration, a set of torsional damper devices must be added between the engine output shaft and the transmission input shaft.

When the torsional damper is applied to the engine flywheel, the engine flywheel is called a dual-mass flywheel, the arrangement space of the torsional damper on the dual-mass flywheel is abundant, but the elastic damping element of the conventional torsional damper applied to the dual-mass flywheel is generally arranged along the circumferential tangential direction of the power transmission shaft by adopting a cylindrical spiral compression spring. The torsional damper with the structure has the advantages that the contact abrasion exists on the excircle of the spring, the manufacturing difficulty of the spring is high, the structure is complex, and the problems of high cost, large abrasion, short service life and the like of the torsional damper are caused.

SUMMERY OF THE UTILITY MODEL

Based on the above, an object of the utility model is to provide a dual mass flywheel, solved with high costs, the big and short-lived scheduling problem of wearing and tearing that prior art exists.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a dual mass flywheel comprising a torsional vibration damper, a first flywheel and a second flywheel, said torsional vibration damper comprising:

the shock absorber comprises a shock absorber body, a first flywheel and a second flywheel, wherein the shock absorber body comprises an outer ring and an inner ring which are coaxially distributed and can relatively rotate, and the outer ring and the inner ring are respectively connected with the first flywheel and the second flywheel;

the pull pin group comprises two pull pin units, and the two pull pin units are respectively positioned on the outer ring and the inner ring;

and the inhaul cables are fixed and tightly attached to the pull pin groups and are distributed along the radial direction of the shock absorber body, so that the two pull pin units of each pull pin group are mutually closed.

As a preferable scheme of the dual-mass flywheel, the pull cable comprises an elastic pull cable made of elastic materials and/or a tension spring pull cable composed of tension springs, and the pull cable is fixed on one group of pull pin groups or the pull cables adjacent to the pull pin groups are connected end to end.

As a preferable scheme of the dual-mass flywheel, the pull cable comprises a tension spring pull cable formed by a tension spring, and the pull cable is fixed on a group of pull pin groups.

As a preferred scheme of the dual-mass flywheel, the stay cable comprises a rigid stay cable, the stay cable is fixed on one group of the pull pin groups or the stay cable of the adjacent pull pin groups is connected end to end, the torsional vibration damper further comprises a spring and a spring seat used for fixing the spring, and the stay cable is tightly attached to the spring seat.

As a preferred scheme of double mass flywheel, the cable includes the hold-in range, be equipped with first meshing tooth on the spring holder, be equipped with on the cable with the second meshing tooth of first meshing tooth meshing, the spring holder is fixed in on the cable.

As a preferable scheme of the dual-mass flywheel, the two pull pin units of the pull pin group respectively comprise two spaced pull pins and one pull pin, the pull cable is positioned on the periphery of the pull pin group and clings to the pull pin group, and the spring seat are positioned between the adjacent pull pin groups.

As a preferred scheme of a dual mass flywheel, the cable includes the bandlet cable, be equipped with the boss on the spring holder, be equipped with the wear to establish the hole on the cable, the boss passes the wear to establish the hole makes the spring holder is fixed in on the cable.

As a preferred scheme of a dual mass flywheel, the inhaul cable comprises a rope or a filamentous inhaul cable, a clamping groove is formed in the spring seat, and the inhaul cable and the clamping groove are in interference fit and fix the spring seat on the inhaul cable.

As a preferred scheme of the dual mass flywheel, the dual mass flywheel further comprises two damping fins and a damping spring, the two damping fins are respectively located at the end part of the spring seat and are parallel to the outer ring, and the damping spring is located between the two damping fins, so that the damping fins are tightly attached to the end part of the spring seat.

As a preferable scheme of the dual-mass flywheel, the number of the pull pin groups comprises at least two, and the at least two pull pin groups are uniformly distributed along the circumferential direction of the shock absorber body.

The utility model has the advantages that: during operation of dual mass flywheel, first flywheel is as power input end, and the second flywheel is as power output end, the utility model discloses simple structure, wearing and tearing are few, long service life, it is not high to the spring requirement, cost reduction, from power input end loaded moment, transmit to power output end through dowel pin group and cable, during the moment transmission, lie in interior round dowel pin unit and lie in the increase of the straight-line distance between the dowel pin unit on the outer lane, power input end and power output end produce certain torsion angle, the ratio of definition moment and torsion angle change is torsional rigidity, the utility model discloses along with the increase of power input end moment, the change of torsion angle and torsional rigidity also is forward continuous increase thereupon, and the damping effect reinforcing.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic view of a dual mass flywheel according to a first embodiment of the present invention;

fig. 2 is a cross-sectional view of a dual mass flywheel according to a first embodiment of the present invention;

fig. 3 is a schematic view of a first variation of a torsional vibration damper according to a first embodiment of the present invention;

fig. 4 is a schematic view of a second variation of a torsional vibration damper according to a first embodiment of the present invention;

fig. 5 is a schematic view of a dual mass flywheel according to a second embodiment of the present invention;

FIG. 6 is a graph comparing the damping performance curves of the embodiment II and the prior art;

fig. 7 is a schematic view of a first variation of a torsional vibration damper according to a second embodiment of the present invention;

fig. 8 is a schematic view of a partial structure of a first modification of a torsional vibration damper according to a second embodiment of the present invention;

fig. 9 is a schematic view of a second variation of a torsional vibration damper according to a second embodiment of the present invention;

fig. 10 is a schematic view of a third modification of the torsional vibration damper according to the second embodiment of the present invention;

fig. 11 is a schematic view of a fourth modification of the torsional vibration damper according to the second embodiment of the present invention;

fig. 12 is a schematic view of the torsional damper according to the second embodiment of the present invention fixed by a pressing block and a fastening member;

fig. 13 is a schematic view of a fifth modification of the torsional vibration damper according to the second embodiment of the present invention;

fig. 14 is a sectional view of a fifth modification of the torsional damper according to the second embodiment of the present invention;

fig. 15 is a schematic view of a damper with a damping structure according to an embodiment of the present invention.

In the figure:

1-outer ring, 11-first flywheel, 2-inner ring, 21-second flywheel, 3-tension pin group, 31-outer ring tension pin unit, 32-inner ring tension pin unit, 33-bolt, 4-inhaul cable, 41-through hole, 5-spring seat, 51-spring seat body, 511-groove, 512-second fixing hole, 52-boss, 53-pressing block, 531-first fixing hole, 54-fastener, 6-spring, 71-damping sheet, 72-damping spring, 8-bearing and 9-rope hoop.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a dual mass flywheel, including torsional damper, first flywheel 11 and second flywheel 21, torsional damper includes shock absorber body, dowel pin group 3 and cable 4, and the shock absorber body includes outer lane 1 and inner circle 2 that coaxial distribution just can relative rotation again, and inner circle 2 and outer lane 1 are connected with second flywheel 21 and first flywheel 11 respectively.

The dowel pin group 3 of the embodiment includes two dowel pin units, namely an outer ring dowel pin unit 31 and an inner ring dowel pin unit 32, the number of the dowel pin groups 3 includes at least two, and the at least two dowel pin groups 3 are uniformly distributed along the circumferential direction of the shock absorber body. The stay cable 4 is fixed and clings to the pull pin groups 3, and the stay cable 4 is distributed along the radial direction of the shock absorber body, so that the outer ring pull pin unit 31 and the inner ring pull pin unit 32 of each pull pin group 3 are close to each other.

The dual mass flywheel during operation of this embodiment, first flywheel 11 is as power input end, second flywheel 21 is as power output end, this embodiment simple structure, wearing and tearing are few, long service life, it is not high to the spring requirement, cost reduction, from power input end loaded moment, transmit to power output end through dowel pin group 3 and cable 4, during the moment transmission, the straight-line distance increase between outer lane dowel pin unit 31 and the inner circle dowel pin unit 32 of every dowel pin group 3, power input end produces certain torsion angle with power output end, the ratio of definition moment and torsion angle change is torsional rigidity, the utility model discloses along with the increase of power input end moment, the change of torsion angle and torsional rigidity also is forward continuous increase thereupon, the damping effect reinforcing.

Example one

As shown in fig. 1 and 2, in the present embodiment, the first flywheel 11 and the outer ring 1 are integrally formed as a first mass body, the second flywheel 21 and the inner ring 2 are integrally formed as a second mass body, the first mass body and the second mass body are coaxially distributed, and a gap is formed therebetween, the outer ring pull pin unit 31 is located on the first mass body and near one side of the second mass body, the inner ring pull pin unit 32 is located on the second mass body and near one side of the first mass body, wherein both the outer ring pull pin unit 31 and the inner ring pull pin unit 32 include only one pull pin, the axial length of the pull pin along the pull pin is not greater than the distance between the first mass body and the second mass body, and the cable 4 is fixed on the pull pin set 3 and located in the gap.

The second flywheel 21 is also provided with a bearing 8 inside, and the bearing 8 can enable the first flywheel 11 and the second flywheel 21 to better keep coaxial rotation. The number of the tension pin groups 3 comprises twelve groups, and two tension pin units of each tension pin group 3 are uniformly distributed along the radial direction of the shock absorber body. Each tension pin unit comprises a tension pin, the pull cable 4 of the embodiment comprises an elastic pull cable made of elastic material and/or a tension spring pull cable made of tension spring, and one pull cable 4 is fixed on one group of the pull pin groups 3. Of course, the structure of the torsional damper of the present embodiment is not limited to the present embodiment, and the following modifications are also possible.

First modification of the torsional damper of the first embodiment

As shown in fig. 3, the number of the kingpin sets 3 of the present embodiment includes eight sets, wherein the outer ring kingpin units 31 and the inner ring kingpin units 32 are uniformly distributed in a staggered manner, each kingpin unit includes one kingpin, the guy cable 4 is an elastic guy cable made of an elastic material, and the guy cables 4 of adjacent kingpin sets 3 are connected end to end and distributed in a star shape.

Second modification of the torsional vibration damper of the first embodiment

As shown in fig. 4, the number of the dowel sets 3 in the present embodiment includes eight sets, and the outer ring dowel units 31 and the inner ring dowel units 32 of each dowel set 3 are uniformly distributed along the radial direction of the damper body, that is, the outer ring dowel units 31 and the inner ring dowel units 32 of each dowel set 3 are on the same diameter. Each tension pin unit comprises a tension pin, the tension cable 4 is a tension spring cable formed by tension springs, two ends of each tension spring cable are respectively provided with a drag hook, the drag hooks are fixed on the tension pins, and one tension spring is fixed on one tension pin group 3.

The first embodiment, the first modification and the second modification of the torsional damper are both the case where the cable 4 is elastic, and the modification of the cable 4 can be realized by the modification of the cable 4 itself. However, the stay 4 of the present invention is not limited to the elastic case, and may be a rigid stay.

Example two

The cable 4 of this embodiment is a rigid cable, that is, the cable 4 has no elasticity, and can be divided into a ribbon cable, a rope, or a wire cable according to the shape of the cross section of the cable 4. In order to enable the torsional vibration damper with the rigid stay cable to realize the function of converting the torque into the torsion angle, the torsional vibration damper comprises a spring 6 and a spring seat 5 for fixing the spring 6, the spring seat 5 is arranged on the vibration damper body, each pull pin group 3 corresponds to two spring seats 5, and the two spring seats 5 can move relatively, so that the spring 5 arranged between the two spring seats 5 can be modified.

The cable 4 is hugged closely with spring holder 5, makes the cable 4 of every dowel pin group 3 be parallelogram distribution along its circumference, and this kind of arrangement can make torsion member shock absorber during operation, compares in prior art, from the moment of the same size of first flywheel 11 input, and this application can produce bigger torsion angle, and the torsional rigidity of this application is littleer promptly. Of course, the guy cable 4 of each dowel pin group 3 of the present invention is not limited to be distributed in a parallelogram along its circumference, but may be a quadrangle or a triangle, and is specifically arranged according to actual conditions.

As shown in fig. 5, the first flywheel 11 of the present embodiment is provided integrally with the outer ring 1, and the inner ring tension pin unit 32, the second flywheel 21, and the inner ring 2 are provided integrally. Including eight dowel pin groups 3, outer lane dowel pin unit 31 includes two dowel pins, inner circle dowel pin unit 32 includes a dowel pin unit, the dowel pin that is located inner circle and outer lane is evenly distributed, cable 4 includes the hold-in range, the hold-in range is the individual layer, two dowel pin units of dowel pin group 3 include two spaced dowel pins and a dowel pin respectively, cable 4 is located the periphery of dowel pin group 3 and hugs closely dowel pin group 3, spring 6 and spring holder 5 are located between the adjacent dowel pin group 3. The outer side of the spring seat 5 is provided with first meshing teeth, the inner side of the inhaul cable 4 is provided with second meshing teeth meshed with the first meshing teeth, the spring seat 5 is fixed on the inhaul cable 4, and the inhaul cable 4 of the adjacent gudgeon pin group 3 is connected end to end in the embodiment.

To further explain the effect of the embodiment in detail, through a lot of experiments, a damping performance curve obtained by using the conventional technology and the second embodiment of the present application is specifically shown in fig. 6. In the figure, the ordinate a is torque, the abscissa B is torsion angle, and a and B are damping performance curves of the torsional damper obtained by the conventional technique and the second embodiment of the present application, respectively. According to experimental results, under the condition that the torque is constant, the torsion angle obtained by the method is larger than that of the traditional scheme, namely, when the same torque is provided for the torsion dampers of the method and the traditional scheme, the torsion rigidity is smaller.

First modification of torsional damper of the second embodiment

As shown in fig. 7, the guy cables 4 are flat belt guy cables, each group of guy pin groups 3 comprises two guy cables 4, each guy cable 4 can be of a single-layer or multi-layer structure, and when the guy cables are of multiple layers, the multiple layers of flat belt guy cables are stacked together to form one guy cable 4. Every pulling force round pin unit includes two gapped pulling force round pins, and the both ends of every cable 4 pass the clearance between two pulling force round pins respectively, make the both ends of cable 4 be crooked form or the form of buckling, make cable 4 be fixed in on the pulling force round pin unit, when cable 4 was tensile, crooked form or the form of buckling formed the friction auto-lock to it is fixed to form to connect.

Spring 6 and spring holder 5 of this variant embodiment are located between two cables 5 of every group, and cable 4 is fixed in on spring holder 5 through boss 52, makes spring holder 5 be fixed in on cable 4, specifically, as shown in fig. 8, is equipped with boss 52 on spring holder 5, is equipped with on the bandlet cable and wears to establish hole 41, boss 52 with wear to establish the hole 41 cooperation to be fixed in on spring holder 5 with cable 4.

Second modification of the torsional vibration damper of the second embodiment

As shown in fig. 9, the guy cables 4 are flat belt guy cables, each group of guy pin groups 3 includes two guy cables 4, each guy cable 4 can be of a single-layer or multi-layer structure, and when the guy cables are multi-layer, the multi-layer flat belt guy cables are stacked together to form one guy cable 4. The spring 6 and the spring seat 5 of the present modified embodiment are located between the two cables 5 of each group.

Two pulling force round pin units of pulling force round pin group 3 all include two gapped pulling force round pins, still be equipped with two bolts 33 between two pulling force round pins of outer lane pulling force round pin unit 31, the both ends of cable 4 can pass the clearance and twine respectively at two bolts 33, make the tip of cable 4 be the bending form of title or the form of buckling, and then make cable 4 be fixed in on the pulling force round pin unit, when cable 4 is tensile, bending form or the form of buckling form friction auto-lock, thereby it is fixed to form the connection. A plug 33 is further provided between the two tension pins of the inner tension pin unit 32, and the middle portion of the cable 4 can be wound around the plug 33 and closely attached to the outer surfaces of the two tension pins of the inner tension pin unit 32, respectively.

Third modification of torsional damper of the second embodiment

As shown in fig. 10, the cables 4 are ropes or wire-shaped cables, and the cables 4 may have a single or multiple structure, and when there are multiple cables, multiple ropes or wire-shaped cables are arranged in parallel or twisted with each other, and the cables 4 of this embodiment have two parallel structures. The spring 6 and the spring seat 5 of the present modified embodiment are located between the two cables 5 of each group. The inner ring 2 and the outer ring 1 are both provided with a rope hoop 9, and the end part of the inhaul cable 4 is fixed on the rope hoop 9.

As shown in fig. 11, the spring seat 5 includes a spring seat body 51, a pressing piece 53 and a fastening piece 54, the spring seat body 51 is provided with a groove 511, the cable 4 can be relatively fixed in the groove 511, the pressing piece 53 is provided with a first fixing hole 531, the spring seat body 51 is provided with a second fixing hole 512, and the fastening piece 54 passes through the first fixing hole 531 to the second fixing hole 512, so that the cable 4 is fixed between the spring seat body 51 and the pressing piece 53.

Fourth torsional damper of the second embodiment

The cable 4 is a rope or a filiform cable, the inner ring 2 and the outer ring 1 are both provided with a rope hoop 9, and the end part of the cable 4 is fixed on the rope hoop 9. The rope (silk) can be in a structure that single-strand or multi-strand mutually twists and a plurality of parallel strands. As shown in fig. 12, the guy cables 4 are of four parallel structures, the spring seat 5 is provided with four clamping grooves, and each guy cable 4 is in interference fit with one clamping groove to fix the guy cable 4 on the spring seat 5.

Of course, the utility model discloses torsional damper's variant is not limited to the above-mentioned several kinds of circumstances that this embodiment provided, can also be other circumstances, for example the cable 4 be for having bellied bandlet form on the surface with the contact of spring holder 5, have on the spring holder 5 with protruding recess 511 that cooperatees and use, when dual mass flywheel carries out the work, protruding joint in recess 511 makes cable 4 be fixed in on the spring holder 5.

Fifth modification of torsional damper of the second embodiment

As shown in fig. 13 and 14, the cable 4 is a flat belt cable, the two tension pin units of the tension pin group 3 respectively include two tension pins with gaps and one tension pin, a gap is formed between adjacent tension pin units including one tension pin, and the cable 4 passes through the gap and is bent or bent, so that the cable 4 is fixed to the tension pin units.

The first flywheel 11 and the outer ring 1 are integrally provided, and the inner ring tension pin unit 32, the second flywheel 21 and the inner ring 2 are integrally provided. Including eight kingpin groups 3, outer lane kingpin unit 31 includes two kingpins, inner circle kingpin unit 32 includes a kingpin unit, the kingpin that is located inner circle and outer lane is evenly distributed, it is gapped to be located between the adjacent kingpin of inner circle, also be equipped with the clearance between two kingpins of outer lane kingpin unit 31, the both ends of bandlet cable can pass above-mentioned clearance respectively, make the bandlet cable be fixed in on kingpin group 3, bolt 33 and spring holder body 51 are hugged closely to cable 4, thereby make cable 4 be fixed in on kingpin group 3. This embodiment simple structure, the damping effect is better.

As shown in fig. 15, the second embodiment further includes a damping structure, which includes two damping fins 71 and a damping spring 72, wherein the two damping fins 71 are respectively located at the end of the spring seat 5 and are parallel to the outer ring 1, and the damping spring 72 is located between the two damping fins 71, so that the damping fins 71 are tightly attached to the end of the spring seat 5. Of course, the utility model discloses a when cable 4 is the rigid cable, both can set up this damping structure, can also not set up the damping structure, specifically confirm according to actual need.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A dual mass flywheel comprising a torsional vibration damper, a first flywheel (11) and a second flywheel (21), characterized in that said torsional vibration damper comprises:

the damper comprises a damper body and a damper body, wherein the damper body comprises an outer ring (1) and an inner ring (2) which are coaxially distributed and can relatively rotate, and the outer ring (1) and the inner ring (2) are respectively connected with a first flywheel (11) and a second flywheel (21);

the pull pin group (3) comprises two pull pin units, and the two pull pin units are respectively positioned on the outer ring (1) and the inner ring (2);

and the inhaul cables (4) are fixed and tightly attached to the pull pin groups (3), and the inhaul cables (4) are distributed along the radial direction of the shock absorber body, so that the two pull pin units of each pull pin group (3) are mutually closed.

2. A twin mass flywheel as defined in claim 1 in which the cable (4) comprises an elastic cable made of an elastic material, the cable (4) being fixed to a set of said set of pins (3) or to the cable (4) of an adjacent set of pins (3) connected end to end.

3. A twin mass flywheel as defined in claim 1 in which the cable (4) comprises a tension spring cable consisting of a tension spring, the cable (4) being fixed to a set of said set of tension pins (3).

4. A twin mass flywheel as defined in claim 1 where the stay (4) comprises a rigid stay, the stay (4) is fixed to one set of the kingpin sets (3) or the stays (4) of adjacent kingpin sets (3) are connected end to end, the torsional vibration damper further comprises a spring (6) and a spring seat (5) for fixing the spring (6), and the stay (4) is attached to the spring seat (5).

5. A twin mass flywheel as defined in claim 4 in which the cable (4) comprises a timing belt, the spring seat (5) is provided with a first engaging tooth, the cable (4) is provided with a second engaging tooth engaging with the first engaging tooth, and the spring seat (5) is fixed to the cable (4).

6. A twin mass flywheel as defined in claim 4 in which the two said latch units of the set (3) of latches comprise two spaced latches and one latch respectively, the cable (4) being located around and abutting the set of latches, the spring (6) and the spring seat (5) being located between adjacent sets of latches.

7. A twin mass flywheel as defined in claim 4 in which the cable (4) comprises a flat ribbon cable, the spring seat (5) is provided with a boss (52), the cable (4) is provided with a through hole (41), and the boss (52) passes through the through hole (41) to fix the spring seat (5) to the cable (4).

8. A twin mass flywheel as defined in claim 4 in which the cable (4) comprises a rope or a wire cable, the spring seat (5) is provided with a notch, the cable (4) and the notch are in interference fit to fix the spring seat (5) to the cable (4).

9. A twin mass flywheel as defined in claim 4 which further comprises two damper plates (71) and a damper spring (72), the two damper plates (71) being located at the end of the spring seat (5) and parallel to the outer race (1), respectively, and the damper spring (72) being located between the two damper plates (71) so that the damper plates (71) are in close contact with the end of the spring seat (5).

10. A twin mass flywheel as defined in any of claims 1 to 9 in which the number of said groups of pins (3) comprises at least two and at least two of said groups of pins (3) are evenly distributed circumferentially along the damper body.