CN113983123A - Torsional vibration damper with torque limiting device - Google Patents

Torsional vibration damper with torque limiting device Download PDF

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Publication number
CN113983123A
CN113983123A CN202110836017.0A CN202110836017A CN113983123A CN 113983123 A CN113983123 A CN 113983123A CN 202110836017 A CN202110836017 A CN 202110836017A CN 113983123 A CN113983123 A CN 113983123A
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CN
China
Prior art keywords
disk
vibration damper
torsional vibration
friction
preparation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110836017.0A
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Chinese (zh)
Inventor
帕斯卡尔·斯特拉塞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of CN113983123A publication Critical patent/CN113983123A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/131—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses
    • F16F15/139—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon the rotating system comprising two or more gyratory masses characterised by friction-damping means
    • F16F15/1397—Overload protection, i.e. means for limiting torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
    • F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
    • F16D7/024—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces
    • F16D7/025—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces with flat clutching surfaces, e.g. discs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/129—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon characterised by friction-damping means
    • F16F15/1297—Overload protection, i.e. means for limiting torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N1/00—Constructional modifications of parts of machines or apparatus for the purpose of lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N9/00—Arrangements for supplying oil or unspecified lubricant from a moving reservoir or the equivalent
    • F16N9/02—Arrangements for supplying oil or unspecified lubricant from a moving reservoir or the equivalent with reservoir on or in a rotary member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/30—Sealing arrangements

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

Abstract

The invention relates to a torsional vibration damper, in particular for a hybrid drive train of a motor vehicle, having an input part and an output part, wherein the input part and the output part are rotatable about a common axis of rotation and are arranged so as to be rotatable relative to one another against the action of a spring device, wherein a torque limiting device having a friction lining is arranged between the spring device and an output hub of the output part, wherein the friction lining is associated with a flange part for loading on the output side and is clamped between two bearing disks connected to the output hub. In order to form a torsional vibration damper with a high transmission capacity, which is axially narrow and in the case of a frictionally engaged torque limiting device, a friction disk is connected to the flange part, said friction disk having friction linings arranged on both sides, which friction linings are axially preloaded between the two support disks.

Description

Torsional vibration damper with torque limiting device
Technical Field
The invention relates to a torsional vibration damper, in particular for a hybrid drive train of a motor vehicle, having an input part and an output part, wherein the input part and the output part are rotatable about a common axis of rotation and are arranged so as to be rotatable relative to one another against the action of a spring device, wherein a torque limiting device having a friction lining is arranged between the spring device and an output hub of the output part, wherein the friction lining is associated with a flange part for loading on the output side and is clamped between two bearing disks connected to the output hub.
Background
A torsional vibration damper with a torque limiting device is known from the publication DE 102017119375 a 1. The torque limiting device limits the torque that can be transmitted via the torsional vibration damper by means of a frictional engagement and slips as soon as a torque preset at the frictional engagement is exceeded, so that the components of the drive train and in particular the spring device of the torsional vibration damper are protected against overloading and damage. The torque limiting device is arranged in the annular chamber formed by the input part radially inside the spring device acting in the circumferential direction between the input part and the output part. The frictional engagement of the torque limiting device is effected wet in conjunction with an annular chamber containing a lubricant for lubricating the spring device.
Disclosure of Invention
The object of the invention is to improve a torsional vibration damper with a torque limiting device. In particular, the object of the invention is to provide an axially narrowly constructed torsional vibration damper having a torque limiting device with a reproducible frictional engagement which is associated with a high transmission capacity.
This object is achieved by a torsional vibration damper according to the invention. The following describes advantageous embodiments of the torsional vibration damper according to the invention.
The proposed torsional vibration damper serves to isolate torsional vibrations, in particular in a hybrid drive train of a motor vehicle. In this case, the torsional vibration damper can be fastened by means of its input part, for example, directly to the crankshaft of the internal combustion engine or to a shaft section of a drive unit consisting of the internal combustion engine and the electric machine.
The input part and the output part of the torsional vibration damper are rotatable about a common axis of rotation and are arranged so as to be rotatable relative to one another against the action of the spring device. Torque is transmitted from the input member to the output member via the spring means, wherein the spring means and the friction means connected in parallel with the spring means via at least a part of the relative rotation of the input member and the output member isolate torsional vibrations transmitted to the input member.
In order to limit the torque that can be transmitted via the torsional vibration damper, for example to protect the components of the drive train and in particular the spring arrangement, the driving comfort, etc., a torque limiting device is provided between the spring arrangement and the output hub of the output part. The torque limiting device sets a maximum transmissible limit torque via the torque limiting device by means of a frictional engagement, and if the limit torque is exceeded, the associated friction pair slips and releases the frictional engagement.
The torque limiting device is preferably arranged between a flange part for loading on the output side and two support disks connected to the output hub. In this case, a friction lining having a friction surface and a mating friction surface in frictional engagement therewith is provided between the flange part and the support disk, which friction surface and mating friction surface form a frictional engagement with axial pretension against one another.
In order to form the torque limiting device in an axially narrow configuration and thus form a torsional vibration damper, the friction linings are connected to the flange part, for example by rivets distributed over the circumference or rivet extensions pressed out of the flange part, and have friction linings arranged on both sides, wherein the friction linings are axially preloaded between the two support disks. The friction lining is connected to the friction lining, for example, by means of rivets, for example, blind rivets, which are sunk into the friction lining, or is glued.
The friction lining can be riveted to the friction lining on the radially outer side thereof on the side of the flange part. By placing the friction lining on a friction lining having a significantly reduced thickness instead of on the flange part, the axial installation space of the torsional vibration damper can only be reduced thereby.
According to an advantageous embodiment, the spring device is accommodated in an annular chamber formed by the input part, for example a disk part connected or connectable to a crankshaft of the internal combustion engine, and a cover part sealingly connected thereto, for example welded thereto. In order to improve the function of the spring device, for example to reduce friction caused by centrifugal forces, the annular chamber can be at least partially filled with a lubricant.
In this case, the maximum torque that can be transmitted via the torque limiting device, such as the limit torque, can be increased in the event of a possible request by: the frictional engagement of the torque limiting device is designed for dry operation. The dry-running frictional engagement is provided here by the frictional engagement of the isolation ring chamber. For example, the frictional engagement can be disengaged in the region of the torque limiting device relative to the annular chamber by: towards the side of the annular chamber facing away from the mating friction surface of the support disc aligned with the flange member.
The friction lining can be separated from the annular chamber, for example, by means of a sealing diaphragm which is arranged between the support disk and the flange part and seals the annular gap between them. For example, the sealing diaphragm can be fastened to the support disk, for example by means of rivets distributed over the circumference or rivet projections projecting from the support disk, and can be axially prestressed against the flange part, for example by means of its radially outer circumference.
In order to seal the annular chamber further outwards, in order to prevent lubricant within the annular chamber and to prevent dirt and water from entering the annular chamber, the disk spring diaphragm can be prestressed axially between the cover part and the flange part which form the annular chamber. The disk spring diaphragm can be accommodated, for example, in a rivet connection of the friction lining on the flange part and can be axially prestressed relative to the cover part, for example, with the interposition of a friction ring to form a friction device connected parallel to the spring device.
The disk spring diaphragm can have an axially form-changing, circumferential section radially inside the rivet, which axially spans the friction lining or the region of the torque limiting device disposed outside the annular chamber, so that the torque limiting device is protected radially from the outside against dirt, for example, when the torsional vibration damper is standing up.
Radially inside, the annular space can be sealed by means of an axial sealing ring, which is arranged between a support disk of the torque limiting device and a disk part of the input part, which is connected to the cover part and is fixed to the crankshaft. The axial seal ring can be centered on the disk member of the input member or on a reinforcing ring connected to the disk member at a threaded portion between the disk member and the crankshaft. The axial sealing ring can be prestressed axially between the disk part and the support disk by means of a disk spring diaphragm.
In order to further reduce the axial installation space of the torsional vibration damper, the support disk and the output hub of the torque limiting device can be connected to one another in an axially nested manner. For example, the two support disks can be connected to one another with the output hub by means of rivets arranged on the same diameter. For example, the output hub and the support disk have axially stamped rivet regions on the circumference alternately and complementary to one another, so that the rivet head or closing head of the rivet connection is in each case at least partially seated in the axial installation space of the sunk rivet region. In this case, material regions having a reduced material thickness are provided in each case on the stamped-out part of the riveting region.
The frictional engagement between the friction surface of the friction lining and the mating friction surface associated with the support disk can be formed, for example, by the mating friction surface of the support disk itself on the one hand and by the mating friction surface of the pressure disk on the opposite side, wherein a disk spring for preloading the friction surface and the mating friction surface is provided between the pressure disk and the associated further support disk. It is to be understood that the friction linings can be formed as pure steel sheets without friction linings, and that the friction linings are arranged on the support disk and the pressure disk, for example glued, applied by means of a coating, riveted or otherwise applied.
Drawings
The invention is explained in detail on the basis of an embodiment which is shown in the sole figure. The figures show a sectional view of an upper part of a torsional vibration damper arranged rotatably about a rotational axis.
Detailed Description
The drawing shows a sectional view of an upper part of a torsional vibration damper 1 arranged rotatably about a rotational axis d. The input member 2 and the output member 3 are rotatably arranged about a rotation axis d and are rotatable relative to each other about the rotation axis d against the action of the spring means 4.
The input part 2 comprises an input-side disk part 6 which is accommodated or can be accommodated in a centered manner on the crankshaft 5 by means of screws 7 and a reinforcing ring 8 and is connected in a sealing manner, for example welded, to a cover part 9 on the radial outside. The disk element 6 and the cover element 9 with their axially molded shoulder 10 form an annular chamber 11 in which the spring device 4 is accommodated.
The spring means 4 comprise helical compression springs 12 arranged distributed in the circumferential direction, for example arc-shaped springs pre-bent to their diameter of use. The end sides of the helical compression springs 12 are loaded in the circumferential direction on the input side and on the output side, respectively. The loading of the input side takes place by means of invisible stampings in the disk part 6 and in the cover part 9. The output-side application of force takes place by means of flange wings 14 arranged radially widened on the output-side flange part 13.
The output section 3 includes: a flange member 13; an output hub 15 having an internal gear 16 for rotationally fixed connection to a transmission input shaft, shaft sections of a dual clutch, etc.; and a torque limiting device 17 operatively disposed between the flange member 13 and the output hub 15.
A torque limiting device 17 forms a frictional engagement between the flange part 13 and the output hub 15 for setting a maximum limit torque that can be transmitted via the torsional vibration damper 1. In this case, the friction lining 20 is received on the side of the flange part 13 facing away from the disk part 6 by means of a rivet 18 having rivets 19 distributed over the circumference. On both sides, friction linings 21 with friction surfaces 22, 23 are arranged on the friction lining 20, which is formed, for example, from a plurality of thin, axially elastic steel plates, and which are axially clamped between two support disks 24, 25 belonging to the torque limiting device 17. The support disks 24, 25 are riveted axially fixedly to the output hub 15 radially within the friction linings 22 and have an axially widened intermediate space 26 radially on the outside, in which the friction disks 20 with their friction linings 21, the pressure disk 27 and the disk springs 28 are seated axially preloaded and centered.
The disk spring 28 is supported on the support disk 25 and pretensions a pressure disk 27, which is connected in a rotationally fixed manner to the support disk 25, in order to clamp the friction lining 21 to the support disk 24. The support disk 24 here directly forms a mating friction surface 29 with respect to the friction surface 22, and the pressure disk 27 forms a mating friction surface 30 with respect to the friction surface 23, which is associated with the support disk 25.
The spring device 4, the flange part 13, the friction lining 20 with the friction linings 21 clamped into the support disks 24, 25, the pressure disk 27 and the disk spring 28, as well as the output hub 15 form a pre-centered assembly which is inserted into the disk part 6 for mounting the torsional vibration damper 1 before the application of the cover part 9 and the welding of the cover part to the disk part 6.
The torsional vibration damper 1 is designed for a reduced axial installation space at least in the region of the torque limiting device 17. The axial design of the axial installation space in the region of the spring device 4 is carried out in relation to the axially available installation space. The axial limitation of the installation space on the torque limiting device 17 is carried out in a first measure by using friction disks 20 provided with a small material thickness, so that a direct pretensioning against the flange part 13 can be achieved, which saves axial installation space. The flange part 13 and the support disk 24 can thereby be arranged axially overlapping, thus saving construction space.
In a further measure, axial installation space is saved by: the support disks 24, 25 and the output hub 15 are connected axially nested one inside the other. In this connection, the support disks 24, 25 and the output hub 15 alternately have axially stamped rivet regions 31, 32, 33 of reduced material on the circumference, wherein the rivets of the rivet points 34, 35 provided for the support disks 24, 25 and the output hub 15, respectively, on the same diameter are at least partially axially sunk into the stamped rivet regions 31, 32, 33, so that less construction space is required in the axial direction.
The frictional engagement of the torque limiter device 17 is configured dry. In this regard, the frictional engagement is protected against the lubricant present in the annular chamber 11 for lubricating the spring device 4. It is furthermore proposed to protect the ring cavity 11 from dirt and water. In contrast, the disk spring diaphragm 36 is accommodated in the rivet 18 and is axially biased against the cover part 9 with the interposition of the friction ring 37. Thereby, a first friction means is formed, which is operatively connected parallel to the spring means 4. The disk spring diaphragm 36 changes shape axially on its inner circumference radially inside the rivet 18, so that the resulting section 38 axially spans the torque limiting device 17 radially outside and is protected against dirt or water from the outside, in particular when the torsional vibration damper 1 is standing up.
Radially inside the rivet connections 34, 35, sealing is effected by means of an axial sealing ring 39 which is axially preloaded between the disk part 6 and the support disk 24 by means of the disk spring diaphragm 36 and centered by means of the reinforcement ring 8. The axial sealing ring 39 here forms a second friction device. The output part 3 is axially elastically positioned relative to the input part 2 by means of the disk spring diaphragm 36 and the axial sealing ring 39.
Between the outer circumference of the support disk 24 and the inner circumference of the flange part 13, in order to avoid lubricant passing through the annular chamber 11, a sealing diaphragm 41 is provided at the annular gap 40. The sealing diaphragm 41 is fixed radially on the inside on the support disk 24 by means of a rivet projection 42, radially spans the annular gap 40 and is axially preloaded against the flange part 13 radially on the outside of the annular gap 40 in its radially outer circumferential region.
List of reference numerals:
1 torsional vibration damper
2 input part
3 output part
4 spring device
5 crankshaft
6 disc parts
7 screw
8 reinforcing ring
9 cover part
10 convex shoulder
11 annular cavity
12 helical compression spring
13 Flange part
14 flange wing part
15 output hub
16 internal tooth part
17 torque limiting device
18 riveted part
19 rivet
20 friction plate
21 friction lining
22 friction surface
23 friction surface
24 support disc
25 support disc
26 intermediate space
27 pressing disc
28 disc spring
29 mating friction surface
30 mating friction surface
31 rivet region
32 riveting zone
33 riveting zone
34 riveting part
35 riveting part
36 disc spring diaphragm
37 friction ring
38 section
39 axial sealing ring
40 annular gap
41 sealing diaphragm
42 rivet projection
d axis of rotation

Claims (10)

1. A torsional vibration damper (1), in particular for a hybrid drive train of a motor vehicle, having an input part (2) and an output part (3), wherein the input part and the output part are rotatable about a common axis of rotation (d) and are arranged so as to be rotatable relative to one another against the action of a spring device (4), wherein a torque limiting device (17) having a friction lining (21) is arranged between the spring device (4) and an output hub (15) of the output part (3), which friction lining is associated with a flange part (13) for loading on the output side and is clamped between two bearing disks (24, 25) connected to the output hub (15),
it is characterized in that the preparation method is characterized in that,
a friction disk (20) is connected to the flange part (13), said friction disk having friction linings (21) arranged on both sides, said friction linings being axially preloaded between two support disks (24, 25).
2. Torsional vibration damper (1) according to claim 1,
it is characterized in that the preparation method is characterized in that,
the frictional engagement of the torque limiting device (17) is designed to be dry-running.
3. Torsional vibration damper (1) according to claim 2,
it is characterized in that the preparation method is characterized in that,
the spring device (4) is arranged in an annular chamber (11) formed by the input part (2) and at least partially filled with lubricant, and acts in a frictional engagement outside the annular chamber (11).
4. Torsional vibration damper (1) according to any of claims 1 to 3,
it is characterized in that the preparation method is characterized in that,
the friction lining (21) is separated from the annular space (11) by means of a sealing membrane (41) which is arranged between the support disk (24) and the flange part (13) and seals an annular gap (40) between them.
5. Torsional vibration damper (1) according to claim 4,
it is characterized in that the preparation method is characterized in that,
the sealing membrane (41) is fixed to the support disk (24) and axially preloaded against the flange part (13).
6. The torsional vibration damper (1) as claimed in any of claims 2 to 5,
it is characterized in that the preparation method is characterized in that,
an axially prestressed disk spring diaphragm (36) which is accommodated in a rivet (18) which accommodates the friction disk (20) is arranged between the cover part (9) which forms the annular space (11) and the flange part (13).
7. Torsional vibration damper (1) according to claim 6,
it is characterized in that the preparation method is characterized in that,
the disk spring diaphragm (36) has a molded section (38) radially inside the rivet (18) that axially spans the torque limiting device (17).
8. The torsional vibration damper (1) of claim 6 or 7,
it is characterized in that the preparation method is characterized in that,
an axial sealing ring (39) which is axially preloaded by the disk spring diaphragm (36) is arranged between the first support disk (24) and a disk part (6) of the input part (2) which is connected to the cover part (9).
9. Torsional vibration damper (1) according to any of claims 1 to 7,
it is characterized in that the preparation method is characterized in that,
the output hub (15) and the support disks (24, 25) are connected to one another axially one inside the other by means of a rivet (34, 35) which connects the support disks (24, 25) to the output hub (15) and has the same diameter.
10. Torsional vibration damper (1) according to any of claims 1 to 8,
it is characterized in that the preparation method is characterized in that,
the mating friction surfaces (29, 30) of the friction surfaces (22, 23) of the friction lining (21) are formed on the one hand by a bearing disk (24) and on the other hand by a pressure disk (27) which is axially preloaded by a further bearing disk (25) by means of a disk spring (28) clamped between the further bearing disk and the pressure disk (27).
CN202110836017.0A 2020-07-27 2021-07-23 Torsional vibration damper with torque limiting device Pending CN113983123A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020119736.5A DE102020119736A1 (en) 2020-07-27 2020-07-27 Torsional vibration damper with torque limiting device
DE102020119736.5 2020-07-27

Publications (1)

Publication Number Publication Date
CN113983123A true CN113983123A (en) 2022-01-28

Family

ID=79179157

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110836017.0A Pending CN113983123A (en) 2020-07-27 2021-07-23 Torsional vibration damper with torque limiting device

Country Status (2)

Country Link
CN (1) CN113983123A (en)
DE (1) DE102020119736A1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017119375B4 (en) 2017-08-24 2024-03-21 Schaeffler Technologies AG & Co. KG Torsional vibration damper

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