DE102021119148A1 - Torsional vibration damper with handling intervention - Google Patents

Abstract

The invention relates to a torsional vibration damper (10) for damping torsional vibrations in a drive train of a motor vehicle, having a primary mass (12) with a primary mass plate (18) and a primary mass cover (30), a secondary mass (14) which can be rotated to a limited extent relative to the primary mass (12), which both are rotatable relative to each other about a common axis of rotation (R) against a restoring moment of an energy storage element (16) designed in particular as a bow spring (4). The handling engagement (36) is introduced into a covering of the primary mass cover (30). The interventions are already punched in the circuit board of the primary mass cover (30) using the tool. The torsional vibration damper (10) can be driven in rotation during a cold test via the handling intervention (36).

Description

The invention relates to a torsional vibration damper for damping torsional vibrations in a drive train of a motor vehicle, having a primary mass with a primary mass plate and a primary mass cover, a secondary mass that can be rotated to a limited extent relative to the primary mass, both of which can be rotated relative to one another about a common axis of rotation R against a restoring moment of an energy storage element designed in particular as a bow spring are.

In the DE 41 17 582 A1 describes a torsional vibration damper. The torsional vibration damper is designed as a dual-mass flywheel.

Dual-mass flywheels are used as vibration absorbers for torsional vibrations in motor vehicle drive trains. As a rule, the dual-mass flywheel is arranged between the crankshaft of an internal combustion engine driving the motor vehicle and a clutch device upstream of the manual transmission. Since a primary mass and a secondary mass of the dual-mass flywheel can be rotated relative to one another against spring force and possibly also against dry friction, torsional vibrations caused by the uneven drive torque of the internal combustion engine, which is usually designed as a reciprocating piston engine, are eliminated.

An intervention geometry in the outer area of the primary side is often required as a handling intervention for handling the components during production or for cranking the entire combustion engine during the so-called cold test. In many cases, the existing hardened or unhardened and circumferentially toothed starter ring gear is used for this. If there is no ring gear for the starter, separate components can be used whose sole purpose is to provide the meshing geometries necessary for the cold test.

There is a constant need to improve the possibility of manipulating the dual mass flywheel for the purpose of a cold test.

It is the object of the invention to indicate measures that enable an improved handling intervention in the case of a cold test.

The object is achieved by a torsional vibration damper with the features of claim 1. Preferred embodiments of the invention are specified in the subclaims and the following description, which can each individually or in combination represent an aspect of the invention.

One embodiment relates to a torsional vibration damper for damping torsional vibrations in a drive train of a motor vehicle, having a primary mass with a primary mass plate and a primary mass cover, a secondary mass that can be rotated to a limited extent relative to the primary mass, both of which can be rotated relative to one another about a common axis of rotation R against a restoring moment of an energy storage element designed in particular as a bow spring are rotatable, wherein the energy storage element radially outwardly overhanging and pointing in an axial direction coverage of the primary mass cover forms at least one handling intervention for a form-fitting, if necessary, engaging drive.

The primary mass and the secondary mass connected via the energy storage element form a dual-mass flywheel with which torsional vibrations or torsional vibrations can be damped. Since the energy storage element can be arranged on a comparatively large radius, the dual mass flywheel can provide a high damping effect. In the dual-mass flywheel, a substantially circular-cylindrical installation space is provided in the radius area of the energy storage element. The secondary mass, in particular an output flange that can be tangentially abutted on the energy storage element, can have a bent profile in the radial direction. It is possible to provide a substantially beveled, for example V-shaped course on the axial side of the torsional vibration damper pointing away from the primary mass, in particular on the transmission side, so that the torsional vibration damper can have a significantly greater axial extent radially outside than radially inside. This utilizes the knowledge that a component in the drive train of a motor vehicle which follows in the flow of torque, for example a motor vehicle transmission, generally requires more installation space radially on the inside than radially on the outside. This makes it possible for the torsional vibration damper to grip this component radially on the outside somewhat, as a result of which free installation space can otherwise be used for the torsional vibration damper.

The energy storage element, which is preferably designed as an arc spring, can be designed as an arc spring arrangement. The arc spring assembly may include multiple arc springs. The primary mass can be designed to introduce a torque, with the primary mass being designed in particular as a flywheel with a crank shaft of a motor vehicle engine can be connected. The secondary mass can be designed to derive or forward a torque to a motor vehicle transmission, for example. The torsional vibration damper can thus be arranged in a drive train between the motor vehicle engine and the motor vehicle transmission, which is preferably a manual transmission which can include a clutch arrangement on the input side for switching or interrupting the power flow as required.

In one embodiment of the invention, the primary mass cover has a sheet metal area which is designed as a cover, in particular for the energy storage element, and in which the handling intervention is introduced. The covering of the primary mass cover can be designed as an outer collar, in which case the handling intervention is made in the outer collar. The covering or the outer collar can be easily manufactured by forming an outer region of the raw sheet metal blank of the primary mass sheet metal. The interventions can already be punched off the tool in the raw sheet blank of the primary mass sheet and are then formed when the primary mass sheet is shaped or its profiling.

In a preferred embodiment, the handling engagement has a plurality of toothed elements distributed over a circumference of the overlap. The toothed elements can thus already be introduced or stamped into the raw sheet metal blank of the primary mass sheet.

In a preferred embodiment it can be provided that the toothed elements are arranged at equal distances over the circumference of the overlap. This offers advantages in subsequent handling, which usually consists of driving the torsional vibration damper in rotation, since the respective handling device can be equipped with a simple detection sensor system, via which the interlocking elements can be detected.

In preferred alternative configurations, the toothed elements are open in the axial direction facing the primary mass or in the axial direction facing away. As a result, the torsional vibration damper can be adapted to the respective application of the handling device in a later cold test or other test scenarios.

In an otherwise advantageous embodiment, the toothed elements are open over the circumference, at least in regions, alternately in the axial direction facing the primary mass and in the axial direction facing away. This configuration can be used more expediently when different handling devices are used in the subsequent cold test, which engage in a form-fitting manner in the torsional vibration damper from opposite axial directions.

In a further alternative configuration, the toothed elements are closed in the axial direction facing the primary mass and in the axial direction facing away.

In a specific embodiment, it can be provided that the covering of the primary mass cover is designed as an outer collar and the primary mass comprises an inner collar, the inner collar and the outer collar being arranged overlapping one another in a region radially outside of the energy storage element. This saves axial space with only slightly larger radial space.

In a further preferred specific embodiment, the primary mass cover is connected in a foot region of the outer collar to an end face of the inner collar of the primary mass in a form-fitting or material-locking manner. This leads to stabilization of the torsional vibration damper in this loaded material area.

Furthermore, it can preferably be provided that the inner collar of the primary mass has, at least in regions, a circumferential bulge pointing in the radial direction for contact with an inner peripheral surface of the outer collar of the primary mass cover.

In one possible embodiment, a drive element is attached at least indirectly to the handling engagement. Here, the drive element can be detachably and, if necessary, fastened. The drive element can, for example, as in the case of a starter device, mesh with respect to the handling intervention if necessary in order to act on the primary mass cover in the direction of rotation by means of a form fit.

• 1: eine schematische Schnittansicht eines Drehschwingungsdämpfers;
• 2a) bis 2c): verschiedene Varianten des Handhabungseingriffs im Primärmassendeckel.

In the following, the invention is explained by way of example with reference to the attached drawings using preferred exemplary embodiments, it being possible for the features presented below to represent an aspect of the invention both individually and in combination. Show it:

• 1 : a schematic sectional view of a torsional vibration damper;
• 2a) until 2c ): different variants of the handling intervention in the primary mass cover.

the inside 1 Torsional vibration damper 10 shown using the example of a dual-mass flywheel for a drive train of a motor vehicle has a primary mass 12 to which a secondary mass 14 is coupled via an energy storage element 16 designed as a bow spring and lubricated with a lubricant so that it can rotate to a limited extent. The primary mass 12 has a radially running flywheel or a primary mass plate 18 from which a tubular inner collar 20 can protrude in the axial direction and can cover the energy storage element 16 radially on the outside. In the exemplary embodiment shown, the secondary mass 14 also has an output hub 26 via which a vibration-damped torque can be derived. Furthermore, a cover element or a primary mass cover 30 is provided, which covers the energy storage element 16 in a radially outer region from an axial side and is also sealed radially inward, so that a sealed space for accommodating lubricant is formed. The primary mass cover 30 forms a covering 32 that overhangs the energy storage element 16 radially on the outside and points in an axial direction. The cover can also be referred to as the outer collar. In one embodiment of primary mass 12, which, as in the present case, has a tubular inner collar 20 that covers energy storage element 16 radially on the outside, cover 32 and inner collar 20 are designed as a circumferential double sheet metal arrangement, with the sheet metal of inner collar 20 and the sheet metal of cover 32 can stabilize each other. In particular, it can be provided that the primary mass cover 30 is connected in a foot region of the covering 32 to a front side of the inner collar 20 of the primary mass 12 in a positive or material connection via a material connection 34 . Provision can also be made for the inner collar 20 of the primary mass 12 to have a circumferential bulge 24 pointing in the radial direction, at least in some areas, for defined contact with an inner peripheral surface of the covering 32 of the primary mass cover 30.

the 2a) , 2 B) and 2c ) show details of respective variants of the covering 32 of the primary mass cover 30. The covering 32 has in any case a handling intervention 36, via which the torsional vibration damper 10 can be driven via a corresponding drive device, for example when a cold test is to be carried out. The drive device, which is not shown here and is also not described further, can engage in the handling engagement 36 in a form-fitting manner and drive the primary mass cover 30 and thus indirectly the entire torsional vibration damper 10 in rotation. The handling engagement 36 can have a plurality of toothed elements 38 distributed over a circumference of the overlap. In this case, a toothed element 38 can be designed as a punched section in the sheet metal of the primary mass cover 30 . It is not absolutely necessary for a toothed element 38 to protrude radially outward beyond the peripheral sheet metal contour of the primary mass cover 30 . However, such a radial elevation can also be provided (not shown).

the 2a) shows an embodiment in which the toothed elements 38 in the primary mass 12 - cf. 1 - Facing the axial direction R _A are open. the 2 B) shows an embodiment in which the toothed elements 38 are open in the axial direction R _A facing away from the primary mass 12 . the 2c ) shows an embodiment in which the toothed elements 38 are closed in the axial direction R _A facing the primary mass 12 and in the axial direction R _A facing away.

Reference List

10

torsional vibration damper

12

primary mass

14

secondary mass

16

energy storage element

18

primary mass plate

20

inner collar

22

outlet flange

24

bulge

26

output hub

30

primary mass cap

32

overlap

34

material connection

36

handling intervention

38

gear element

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 4117582 A1 [0002]

Claims (10)

Torsional vibration damper (10) for damping torsional vibrations in a drive train of a motor vehicle, with a primary mass (12) with a primary mass plate (18) and a primary mass cover (30), a secondary mass (14) that can be rotated to a limited extent relative to the primary mass (12), both of which are about a common axis of rotation (R) can be rotated relative to one another against a restoring moment of an energy storage element (16) designed in particular as a bow spring (4), characterized in that a covering (32) of the primary mass cover ( 30) forms at least one handling engagement (36) for a form-fit drive that engages as required. Torsional vibration damper (10). claim 1 , characterized in that the handling engagement (36) has a plurality of toothed elements (38) distributed over a circumference of the overlap. Torsional vibration damper (10). claim 2 , characterized in that the toothed elements (38) are arranged at equal distances over the circumference of the cover (32). Torsional vibration damper (10). claim 2 or 3 , characterized in that the toothed elements (38) are open in the axial direction R _{A facing away from the primary mass (12) or in the axial direction R A facing} away. Torsional vibration damper (10). claim 4 , characterized in that the toothed elements (38) are open over the circumference at least in regions alternately in the axial direction R _A facing the primary mass (12) and the axial direction R _A facing away. Torsional vibration damper (10). claim 2 or 3 , characterized in that the toothed elements (38) in the primary mass (12) facing axial direction R _A and facing away from the axial direction R _A are closed. Torsional vibration damper (10) according to one of Claims 1 until 6 , characterized in that the covering (32) of the primary mass cover (30) is designed as an outer collar and the primary mass (12) comprises an inner collar (20), the inner collar (20) and the outer collar (32) being in a region radially outside of the Energy storage element (16) are arranged overlapping each other. Torsional vibration damper (10). claim 7 , characterized in that the primary mass cover (30) is connected in a foot region of the outer collar (32) to an end face of the inner collar (20) of the primary mass (12) in a form-fitting or material-locking manner. Torsional vibration damper (10). claim 7 or 8th , characterized in that the inner collar (20) of the primary mass (12) has, at least in regions, a circumferential bulge (24) pointing in the radial direction, for contact with an inner peripheral surface of the outer collar (32) of the primary mass cover (12). Torsional vibration damper (10) according to one of Claims 1 until 9 , characterized in that a drive element is attached at least indirectly to the handling engagement (36).

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