DE102017106573A1 - torsional vibration dampers - Google Patents

Abstract

It is a torsional vibration damper (10), in particular two-mass flywheel, for torsional vibration damping between a drive shaft (16) of a motor vehicle engine and a transmission input shaft of a motor vehicle transmission provided with a primary mass (14) for introducing a torque, relative to the primary mass (14) via an energy storage element (24 ), in particular bow spring, limited rotatable secondary mass (28) for discharging the torque and at least partially radially outward to the primary mass (14) arranged and with the primary mass (14) associated additional mass (32) for providing a primary-side moment of inertia. Due to the additional mass (32) arranged radially outside the primary mass (14), a high mass moment of inertia can be achieved with a small radial extent of the primary mass (14), so that a cost-effective adjustment of a moment of inertia of a torsional vibration damper (10) is made possible.

Description

The invention relates to a torsional vibration damper, in particular two-mass flywheel, with the aid of which torsional vibrations of a drive shaft of a motor vehicle engine can be damped.

For example DE 10 2008 004 150 A1 a dual-mass flywheel is known in which the torsional vibration damping of a drive shaft of a motor vehicle internal combustion engine, a primary mass is coupled via a bow spring with a rotatable relative to the primary mass secondary mass. The bow spring is arranged in a bow spring channel, wherein a channel wall of the bow spring channel is formed by the primary mass. In the bow spring channel protrudes an output flange of the secondary mass, via which the introduced torque of the drive shaft vibration damping can be discharged to a friction clutch for coupling a transmission input shaft of a motor vehicle transmission.

There is a constant need to be able to set the moment of inertia of a torsional vibration damper cost.

It is the object of the invention to show measures that allow a cost-effective adjustment of a moment of inertia of a torsional vibration damper.

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

According to the invention, a torsional vibration damper, in particular dual mass flywheel, for torsional vibration damping between a drive shaft of an automotive engine and a transmission input shaft of a motor vehicle transmission provided with a primary mass for introducing a torque, a relative to the primary mass via an energy storage element, in particular bow spring, limited rotatable secondary mass for discharging the torque and at least one partially arranged radially outside of the primary mass and associated with the primary mass additional mass to provide a primary-side moment of inertia.

As a result of the additional mass designed in particular in the form of a mass ring, the mass moment of inertia otherwise provided by the primary mass can be increased. This allows a higher primary moment of inertia, without the primary mass itself would have to be increased in the radial direction and / or in the axial direction. Instead, it is even possible to reduce the radial extent of the primary mass and to use the space radially outside the, optionally radially shortened, primary mass for the additional mass. Here, the knowledge is exploited that the primary mass usually has a primary flange which is punched out as a blank from a metal sheet and subsequently processed, in particular plastically deformed is. By means of the arranged radially outside the primary mass additional mass achievable lower radial extent of the primary flange can be used for the preparation of the primary flange a blank having a smaller diameter, so that the production of the primary flange and thus the primary mass can be done more cost-effectively. In addition, depending on the desired vibration behavior of the torsional vibration damper, the inertia provided for this purpose can be adjusted by an additional mass with a correspondingly modified geometry, without having to change the other components of the torsional vibration damper as well. As a result, the same primary mass can be used with the help of various additional masses for different types of torsional vibration dampers, so that the production costs can be further reduced by mass production of the primary mass. The additional mass can be produced for example by forging, so that for the additional mass in comparison to metal sheets significantly larger material thicknesses are made possible with less material loss. By arranged radially outside the primary mass additional mass, a high moment of inertia can be achieved with a small radial extent of the primary mass, so that a cost-effective adjustment of a moment of inertia of a torsional vibration damper is possible.

The primary mass and the secondary mass arranged rotatably coupled to the primary mass via the energy storage element configured in particular as a bow spring can form a spring-mass system in the manner of a dual-mass flywheel which, in a certain frequency range, initiates rotational irregularities in the rotational speed and in the torque introduced via the primary mass can dampen drive power generated by an automotive engine. Here, the mass moment of inertia of the primary mass and / or the secondary mass and the spring characteristic of the composite, for example, nested sheet springs energy storage element may be selected such that vibrations in the frequency range of the dominant engine orders of the motor vehicle engine can be damped. For this purpose, in particular the mass moment of inertia of the additional mass can be particularly easily adapted by a suitable choice of geometry for the designated application. The primary mass can have a motor-side primary flange, which is directly or indirectly coupled to a drive shaft of an automobile engine and designed in the manner of a flywheel, to which a transmission-side cover can be connected, whereby a substantially annular receiving space for the energy storage element can be limited. For example, the primary mass can strike tangentially on the energy storage element via indentations projecting into the receiving space. In the receiving space, an output flange of the secondary mass protrude, which can strike tangentially at the opposite end of the energy storage element. With the output flange, a further additional mass and / or a power transmission element for transmitting the torque to a downstream in the power flow unit, for example, by a riveted joint, be attached. The force transmission element is designed for example as a driver ring, which preferably forms a friction surface for a friction clutch and thereby simultaneously may be a counter-plate of the friction clutch, against which a pressure plate of the friction clutch can be axially displaced to between the drive plate designed as a counter-plate and the pressure plate a clutch disc to be frictionally pressed. The power transmission element can also be designed as an output hub, which can be coupled in a rotationally fixed manner to a shaft, in particular via a spline. The secondary mass, preferably the output flange and / or the force transmission element, may in particular be coupled indirectly via a clutch to a transmission input shaft of a motor vehicle transmission. The clutch may be configured, for example, as a friction clutch or hydrodynamic torque converter.

In particular, a sprocket, in particular for initiating a start moment generated by an electrical start for starting the motor vehicle engine, is connected radially spaced from the primary mass with the additional mass. Preferably, the sprocket is exclusively connected to the additional mass, so that a direct contact between the sprocket and the primary mass is not required. The primary mass does not require a radial extent that is so large that a sprocket with a certain diameter can be connected to the primary mass. Instead, the primary mass may have a particularly small radial extent, while the radial distance between the primary mass and the ring gear is bridged by the additional mass. Despite a small outer diameter of the primary mass, the sprocket may have a large diameter with a correspondingly large transmission ratio, so that a sufficiently large starting torque can be introduced via the sprocket.

Preferably, the sprocket is centered on the additional mass in the radial direction. The additional mass may have a centering seat on which the sprocket can be attached. In particular, the additional mass forms a limit stop which adjoins the centering seat in order to predefine the axial relative position of the toothed rim to the additional mass. The sprocket and / or the additional mass may have an insertion bevel for pushing the ring gear on the centering seat of the additional mass. Preferably, the sprocket with the additional mass, in particular exclusively with the additional mass, attached, preferably welded. The relative position of the ring gear can be easily specified, so that in particular a sufficient coupling with a starter pinion of the starter can be ensured.

Particularly preferably, the primary mass has a primary flange for introducing the torque and a cover connected to the primary flange for limiting a receiving space formed between the primary flange and the cover for receiving the energy storage element, wherein the ring gear viewed in the radial direction at least partially, preferably completely, the primary flange covered. The axial extension of the ring gear may even be greater than the axial extent of the primary flange. Since the additional mass is arranged radially outside the primary mass, the additional mass can easily have a particularly large axial extent, which may exceed the axial extent of the primary flange and the ring gear. The sprocket can thereby enter into a good bond with the additional mass and yet be arranged in an axial region in which the primary flange is arranged. An existing space can be as optimally and / or fully utilized by the additional mass and the sprocket, for example, to be able to provide a particularly large moment of inertia at low production costs can.

In particular, the additional mass is centered on the primary mass in the radial direction. The relative position of the additional mass and optionally associated with the additional mass sprocket can be easily specified. Unnecessary imbalances can be avoided.

Preferably, the primary mass has a primary flange for introducing the torque and a lid connected to the primary flange for limiting a receiving space formed between the primary flange and the lid for receiving the energy storage element, wherein the additional mass is centered in the radial direction on the primary flange or on the lid. The primary flange and the lid each form a radially outwardly facing lateral surface, which can be used for centering the additional mass. Preferably, the additional mass is centered on the primary flange and fastened to the cover, in particular by welding, or the additional mass is centered on the cover and fastened to the primary flange, in particular by welding. A formed by the primary mass centering seat for the additional mass can thereby not deform thermally rather, if the additional mass is fixed in the desired relative position with the primary mass. The primary flange or the cover and / or the additional mass may have an insertion bevel for pushing the additional mass onto the centering seat of the primary mass.

Particularly preferably, the mass moment of inertia of the additional mass is greater than the mass moment of inertia of the primary mass. The primary-side mass moment of inertia can be significantly provided by the additional mass. The primary mass can thereby be used for a variety of different designs of the torsional vibration damper, while only a correspondingly adapted additional mass needs to be provided for the various intended damping properties.

In particular, the additional mass is arranged at least to a large extent, preferably completely, radially outward to a receiving space formed by the primary mass for receiving the energy storage element. The receiving space and the energy storage element can thereby be arranged comparatively far radially inward, so that the torsional vibration damper can be accommodated in a confined space. The geometry of the additional mass is subject to lower restrictions in comparison to the energy storage element and the energy storage element covering receiving space, so that almost any geometries are possible for the additional mass to realize a certain moment of inertia. The existing space can be filled and used by the additional mass easier. The additional mass can thereby easily meet high space requirements, so that even in a confined space, a high primary-side mass moment of inertia can be achieved.

Preferably, with the additional mass, in particular exclusively with the additional mass, at least one balancing element for balancing the torsional vibration damper attached. The balancing element need not be attached to the primary mass, but may be attached to the additional mass, in particular by gluing or welding. Even with a comparatively small radial extent of the primary mass, the balancing element can be arranged on a large radius, so that with a small mass of the balancing element, a large mass moment of inertia achieved by the balancing element can be provided. By using less material in the balancing element sufficient balancing can be achieved. The balancing element is provided in particular on the motor side of the additional mass. Preferably, the balancing element in the radial direction is covered by the ring gear arranged radially outside the balancing element, so that the tooth force can act as burst protection for the balancing element and can block the radial throwing away of a ruptured balancing element.

Particularly preferably, the primary mass has a primary flange for introducing the torque and a lid connected to the primary flange for limiting a receiving space formed between the primary flange and the lid for receiving the energy storage element, wherein the primary flange of a steel sheet, in particular by punching and plastic forming, produced is, wherein the primary flange, in particular in a radius range of the energy storage element, has a tapered axial material thickness. The primary flange can be produced inexpensively. In particular, the primary flange can have projections which are made by impressing into the receiving space of the energy storage element and which can strike in tangential direction at one end of the energy storage element. By provided radially outside the primary mass additional mass of the primary flange can be made cheaper from a much smaller Ronde. A contouring of the primary flange in the axial direction can be achieved by non-cutting forming, whereby a variable along a radial axial thickness of the primary flange can be easily realized. This allows sufficient space for the energy storage element even in cramped space conditions in the axial direction.

• 1: eine schematische Schnittansicht eines Drehschwingungsdämpfers.

The invention will now be described by way of example with reference to the accompanying drawing with reference to a preferred embodiment, wherein the features shown below, both individually and in combination may represent an aspect of the invention. It shows:

• 1 : A schematic sectional view of a torsional vibration damper.

The in 1 illustrated substantially in the nature of a designed as a dual mass flywheel torsional vibration damper 10 for a drive train of a motor vehicle has one about an axis of rotation 12 rotatable primary mass 14 on that with a drive shaft 16 a motor vehicle engine can be attached directly or indirectly. The primary mass 14 has one with the drive shaft 16 coupled primary flange 18 and one with the primary flange 18 welded lid 20 on, between which a recording room 22 is limited for designed as a bow spring energy storage element 24. In the recording room 22 protrudes an output flange 26 of a secondary mass 28 into it, that of the primary mass 14 to the energy storage element 24 transmitted torque vibration damped to an output hub 30 of the secondary mass 28 to be able to escape.

Radially outside to the primary mass 14 and to the secondary mass 28 an additional mass 32 is provided, which on the primary flange 18 the primary mass 14 is centered and with the lid 20 the primary mass 14 is welded. The primary flange 18 This is complete and the lid 20 partly from the additional mass 32 covered in the radial direction. The additional mass 32 increases the primary side moment of inertia otherwise provided by the primary 14 alone. With the additional mass 32 is a primary mass 14 radially spaced sprocket 34 fastened, via which a starting torque for starting the motor vehicle engine can be initiated. In addition, on the engine side axial side of the additional mass 32 a balancing element 36 attached, with the help of the torsional vibration damper 10 is balanced. The balancing element 36 is radially outward of the sprocket 34 covered.

LIST OF REFERENCE NUMBERS

10

torsional vibration dampers

12

axis of rotation

14

primary mass

16

drive shaft

18

primary flange

20

cover

22

accommodation space

24

Energy storage element

26

output flange

28

secondary mass

30

output hub

32

additional mass

34

sprocket

36

balancing element

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102008004150 A1 [0002]

Claims (10)

Torsional vibration damper, in particular dual-mass flywheel, for torsional vibration damping between a drive shaft (16) of a motor vehicle engine and a transmission input shaft of a motor vehicle transmission, with a primary mass (14) for introducing a torque, a relative to the primary mass (14) via an energy storage element (24), in particular bow spring, limited rotatable secondary mass (28) for discharging the torque and an at least partially radially outwardly of the primary mass (14) and arranged with the primary mass (14) associated additional mass (32) for providing a primary-side mass moment of inertia. Torsional vibration damper after Claim 1 characterized in that a ring gear (34), in particular for initiating a starting torque generated by an electrical start for starting the motor vehicle engine, radially spaced from the primary mass (14) with the additional mass (32) is connected. Torsional vibration damper after Claim 2 characterized in that the sprocket (34) on the additional mass (32) is centered in the radial direction. Torsional vibration damper after Claim 2 or 3 characterized in that the primary mass (14) comprises a primary flange (18) for introducing the torque and a lid (20) connected to the primary flange (18) for defining a receiving space (22) formed between the primary flange (18) and the lid (20) ) for receiving the energy storage element (24), wherein the sprocket (34) viewed in the radial direction, the primary flange (18) at least partially, preferably completely, covered. Torsional vibration damper after one of Claims 1 to 4 characterized in that the additional mass (32) on the primary mass (14) is centered in the radial direction. Torsional vibration damper after one of Claims 1 to 5 characterized in that the primary mass (14) comprises a primary flange (18) for introducing the torque and a lid (20) connected to the primary flange (18) for defining a receiving space (22) formed between the primary flange (18) and the lid (20) ) for receiving the energy storage element (24), wherein the additional mass (32) is centered in the radial direction on the primary flange (18) or on the cover (20). Torsional vibration damper after one of Claims 1 to 6 characterized in that the mass moment of inertia of the additional mass (32) is greater than the mass moment of inertia of the primary mass (14). Torsional vibration damper after one of Claims 1 to 7 characterized in that the additional mass (32) at least for the most part, preferably completely, radially outside to one of the primary mass (14) formed receiving space (22) for receiving the energy storage element (24) is arranged. Torsional vibration damper after one of Claims 1 to 8th characterized in that with the additional mass (32), in particular exclusively with the additional mass (32), at least one balancing element (36) for balancing the torsional vibration damper (10) is fixed. Torsional vibration damper after one of Claims 1 to 9 characterized in that the primary mass (14) comprises a primary flange (18) for introducing the torque and a lid (20) connected to the primary flange (18) for defining a receiving space (22) formed between the primary flange (18) and the lid (20) ), for receiving the energy storage element (24), wherein the primary flange (18) of a steel sheet, in particular by punching and plastic forming, can be produced, wherein the primary flange (18), in particular in a radius range of the energy storage element (24), a tapered axial Has material thickness.

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