WO2016141941A1

WO2016141941A1 - Torsional vibration damper

Info

Publication number: WO2016141941A1
Application number: PCT/DE2016/200123
Authority: WO
Inventors: Yun Kai Lim; Stephan Hämisch
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2015-03-11
Filing date: 2016-03-08
Publication date: 2016-09-15
Also published as: DE112016001131A5; DE102015204340A1

Abstract

The invention relates to a torsional vibration damper (1), in particular for a drivetrain of a motor vehicle, comprising an input part (2) and an output part (3), a spring damping device (4) arranged in the torque flow between the input part (2) and the output part (3), wherein the torsional vibration damper (1) and, in particular, the input part (2), the output part (3), and/or the spring damping device (4), or parts thereof, has or have a multi-part construction consisting of a first element and a second element, wherein a distance (x), which is achieved by a spacer, is provided between the first element and the second element and the spacer is designed as a stepped region (18) of a rivet element (15) by means of which the first element is connected to the second element.

Description

torsional vibration dampers

The invention relates to a torsional vibration damper, in particular for the drive train of a motor vehicle.

Torsional vibration damper, also called torsional vibration damper, are widely known in the art. In this case, for example, such torsional vibration damper become known, which are referred to as so-called dual-mass flywheels. These have a primary flywheel and a secondary flywheel, which are mounted rotatably relative to each other, wherein between the primary flywheel and the secondary flywheel a spring damper is provided with bow springs, so that the primary flywheel against the restoring force of the spring damper is rotatable relative to the secondary flywheel. In this case, for example, a spring damper is used, in which the input side of the spring damper a pocket for springs is formed and the output side of the spring damper engages a flange in the pocket. In this case, a torque is transmitted from the input part of the spring damper via the springs on the output side flange of the spring damper. Often, the flange is connected radially inwardly with a hub part via a spacer, so that the axial distance of the flange is defined to the hub part. In this case, a rivet element is guided and riveted through holes in the flange, in the spacer and in the hub part to connect these three components with a defined distance between the flange and hub part.

However, the insertion of the spacer means an additional effort, because an additional component must be handled in the assembly, which costs in addition to the material associated with the spacer cost also additional installation costs.

It is the object of the present invention to provide a torsional vibration damper, which is simplified compared to the prior art and thus less expensive to produce. The object of the invention is achieved with a torsional vibration damper with the features of claim 1.

An embodiment of the invention relates to a torsional vibration damper, in particular for the drive train of a motor vehicle, with an input part and with an output part, arranged with a torque flow between the input part and the output part spring damper device, wherein the torsional vibration damper, in particular the input part, the output part and / or the spring damper device or parts thereof of a first element and a second element is formed in several parts, wherein between the first element and the second element, a distance is provided, which is achieved by a spacer, wherein the spacer formed as a stepped portion of a rivet is, by means of which the first element is connected to the second element. This ensures that the defined spacing from the first element to the second element no additional part, such as a spacer is to be provided and mounted, but with the rivet element to be used, the connection is generated and at the same time the distance is adjusted. This facilitates assembly and saves costs.

It is advantageous if with the output part, as one of the two elements, a flange of the spring damper device, as the second of the two elements, is connected. Thereby, the output part may be formed in two parts and yet the two elements are spaced defined to be interconnected, wherein the connection between the flange and the output part by means of the rivet element, which also ensures the defined spacing. Thereby, the output part can be made easier, especially if different requirements exist on the two elements of the output part, such as material requirements, etc. so the flange can be formed as a hardened sheet steel part and the output part with internal teeth, for example, be designed as a cast part.

It is particularly advantageous if the flange is connected to the output part by means of the rivet element, wherein the flange on the one hand of the stepped portion of the rivet element is arranged and the output part on the other hand of the stepped Area of the rivet element is arranged. Thereby, the stepped portion is formed as a kind of intermediate element, which forms a mutual shoulder on which each of the flange or the output part create. The width of the stepped area defines the distance between the two elements.

The rivet element is preferably formed as a rivet element with an approximately centrally arranged stepped portion having a diameter which is larger than the adjacently disposed adjacent areas which engage through openings in the flange or output part to connect them. The axial width of the larger diameter stepped portion then defines the spacing of the members to be joined, which may be exposed to the smaller diameter portions to secure the respective member, such as flange or output member, by deformation of the respective end portion of the rivet member.

It is also expedient if a friction damping device is arranged between the flange and the input part, which has a friction ring which is supported both on the flange and on the input part in the axial direction. As a result, in addition to the spring damping, friction damping can also be integrated, which results in improved damping, because the vibration amplitudes of the torsional vibration can thereby be reduced in an improved manner.

It is also advantageous if between the flange and the input part, a cover plate is arranged, which is held radially inwardly by means of the rivet element on the flange and is supported radially on the outside of the input part. As a result, the spring damper is better protected against dirt, water penetrating from the outside.

Furthermore, it is advantageous if, furthermore, a centrifugal pendulum device is provided, which has a flange and flyweights arranged on the flange, wherein the flange is connected to the output part. As a result, the torsional vibration damping is further improved because it allows certain modes of vibration of the torsional vibration to be more effectively damped. It is also advantageous if the flange of the centrifugal pendulum device is connected by means of the rivet element with the output part. As a result, a simple coupling and connection of the centrifugal pendulum device is possible and no additional elements are required for attachment.

It is also expedient if, furthermore, a cover disk is provided which covers the centrifugal pendulum device in the axial direction and at least partially overlaps the centrifugal pendulum device radially on the outside. This cover on the one hand increases the moment of inertia of the output part and on the other hand protects the centrifugal pendulum device against pollution, etc.

It is particularly advantageous if the cover is connected to the flange of the centrifugal pendulum device, in particular riveted, welded or otherwise connected. This also reduces the need for additional components, which reduces costs.

It is also particularly advantageous if the spring damper device is designed such that the input part and the flange of the spring damper device are arranged rotatable relative to each other and that at least one spring between the input part and the flange of the spring damper device is arranged in the torque flow, so that the flange of the spring damper device against the restoring force of the at least one spring is rotatable relative to the input part. Thus, an effective torsional vibration damping can be achieved. The at least one inserted spring or the springs used can be bow springs or straight compression springs, which are supported on the input part and on the flange, so that the flange is rotatable relative to the input part against the return force.

The present invention will be explained in more detail below on the basis of preferred exemplary embodiments in conjunction with the associated FIGURE.

Showing: Figure 1 is a schematic representation of a half section through an embodiment of a torsional vibration damper according to the invention.

1 shows a first embodiment of a torsional vibration damper 1 in a schematic half-section. In this case, the torsional vibration damper 1 is rotatable about the axis L-l. This axis l-l also defines the reference point for the radial or axial direction and for the circumferential direction.

The torsional vibration damper 1 has an input part 2 and an output part 3. Also, a spring damper device 4 is provided. The input part 2 is also the input part of the spring damper device 4. The output part of the spring damper device 4 is formed as a flange 5.

The input part 2 is formed by the disk elements 6, 7, which are connected to each other. In this case, the disk element 6 forms a ground disk, which extends substantially in the radial direction and bulges somewhat radially outward and is bent over in the axial direction. The disk element 7 extends substantially in the radial direction and is also slightly bulged in the middle region. The disk element 7 is welded radially on the outside with the end region of the disk element 6 extending in the axial direction, see the weld seam 8. The bulged region of the two disk elements 6, 7 forms a pocket 9, in which at least one spring 10, advantageously several Springs 10, 1 1 are included. In this case, an outer spring 10 and an inner spring 1 1 is provided in the embodiment of Figure 1, which are inserted into one another and the inner spring 1 1 inserted in a central opening 12 of the outer spring. Between the outer spring 10 and the radially outer region of the pocket, a wear protection insert 13 is provided, on which the spring 10 is supported, so that upon movement of the spring 10, the spring 10 itself or the disk element 6 is protected against wear. The wear protection insert 13 is advantageously designed as a curved steel insert. The wear protection insert is optional and can also be omitted in various embodiments. It can also be seen that a lubricant filling 14 is present in the pocket 9. This lubricant may be, for example, a grease. As a result, the spring 10 is lubricated in contact with the wear protection insert 13. Also, the contact between the springs 10 and 1 1 is advantageously lubricated. The lubricant filling is optional and may also be omitted in various embodiments.

The spring 10 or the springs 10, 11 are preferably designed as arc springs or spring springs which circumferentially sweeps over an arc of at least 60 °, preferably at least 120 °, at least 135 ° or at least 150 °. Thus, it is advantageous if preferably two such bow springs are provided on the circumference of the torsional vibration damper 1. Alternatively, the spring 10, 1 1 or the springs 10, 1 1 may also be formed as a compression spring, such as a straight compression spring or a short bent compression spring.

The springs 10, 1 1 shown in Figure 1 may also be formed as a single springs 10, in which no inner spring 1 1 is arranged.

The pocket 9 receives the springs 10, 1 1, wherein the springs 10, 1 1 on the Ta- see 9 and not shown attacks the pocket or the disc elements 6, 7 are supported in the circumferential direction. Also, the flange 5 is supported on the springs 10, 1 1 in the circumferential direction, which engages from radially inward into the pocket 9.

On the flange 5, which extends from radially outward to radially inward as a substantially flat disc, the output part 3 is arranged radially inwardly by means of the rivet element 15. The output part 3 is also formed radially outwardly substantially disc-shaped, wherein the output part 3 is formed radially inwardly as a hub 16 with internal teeth 17.

Thus, the flange 5 and the output part 3 are formed as two members which are connected to each other. It can also be described in such a way that the flange 5 and the output part 3 are formed in several parts and connected to each other. AI lerdings, a distance x is provided between the flange 5 as the first element and the output part 3 as a second element, which is achieved by a spacer 18. The spacer 18 is formed as a stepped region of the rivet element 15, by means of which the flange 5 is connected as a first element to the output part 3 as a second element.

Instead of the flange and the output part but other elements of the torsional vibration damper 1 may be connected to each other at a distance. The flange 5 and the output part 3 serve only as an example without limitation of the scope of protection.

The rivet element 15 is formed as an approximately cylindrical or otherwise elongated element, which is subdivided into at least three regions, wherein the stepped region 18 is arranged approximately centrally, this does not mean that it actually has to be arranged centrally. Edge regions 19, 20 are provided on both sides of the stepped region 18, so that the stepped region 18 is arranged between the edge regions 19, 20. The diameter of the stepped portion 18 is greater than the respective diameter of the two edge regions 19, 20, so that a respective shoulder 21, 22 forms, on which the flange 5 and the output part 3 can create. When riveting then the rivet heads 23, 24 arise.

The flange 5 is connected to the output part 3 by means of the rivet element 15, the flange 5 on the one hand of the stepped portion 18 of the rivet element 15 is arranged and the output part 3 on the other hand, the stepped portion 18 of the rivet element 15 is arranged. The width of the stepped portion 18 of the rivet member in the axial direction also defines the distance x between the flange 5 and the output member 3.

In Figure 1 it can be seen further that between the flange 5 and the input part 3 radially inwardly a Reibungsdämpfungsvorrichtung 25 is arranged, which has a friction ring 26 which is supported both on the flange 5 and on the input part 3 in the axial direction , The friction ring 26 is preferably made Plastic formed. It is held radially inward by a holding element 27, which surrounds the friction ring slightly in the radial direction.

It can also be seen in FIG. 1 that between the flange 5 and the input part 3 a cover disk 28 is arranged, which is held radially on the flange 5 by means of the rivet element 15 and which is supported radially on the outside of the input part 3 or the disk 7 , As a result, the bag is completed or the interior better protected that as possible no dirt can penetrate or possibly no lubricant can escape.

With the output part 3, a centrifugal pendulum device 30 is further connected, which has a flange 31 and on the flange 31 displaceably arranged centrifugal weights 32, wherein the flange 31 is connected to the output part 3 radially inward. The flyweights 32 are guided displaceably by means of roller elements 33 on the flange.

The flange 31 is approximately S-shaped, wherein the radially inner annular region 34 of the flange 31 is axially offset with respect to the radially outer annular region 35. Alternatively, in another embodiment, the flange 31 could also be flat.

The flange 31 of the centrifugal pendulum device 30 is connected radially inwardly by means of the rivet element 15 with the output part 3. In this case, the flange 31 is arranged on the side facing away from the stepped portion of the output part 3.

Adjacent to the flange 31, a cover plate 29 is further provided, which covers the centrifugal pendulum device 30 in the axial direction and the centrifugal pendulum device engages over at least partially radially on the outside. The cover plate 29 is connected to the flange 31 of the centrifugal pendulum device 30, such as in particular riveted, welded or otherwise connected. Alternatively, the cover may also be omitted in some embodiments. The torsional vibration damper 1 can be screwed by means of only schematically indicated screws 36 through through holes in the input part 2, for example with a crankshaft of a drive motor. The through holes are not shown. For riveting of the flange 5 and the output part 3 or flange 31, the input part 2 bores 37, which can be closed by the lid 38 after riveting.

The torsional vibration damper 1 is provided for example for an application with a double clutch of a drive train of a motor vehicle.

LIST OF REFERENCES

torsional vibration dampers

introductory

output portion

Spring damper device

flange

disk element

Weld

bag

feather

opening

Wear protective insert

lubricant filling

rivet

hub

internal gearing

Spacer, graduated area

border area

shoulder

rivet head

Friction damping device

friction ring

retaining element

cover disc

cover plate Centrifugal pendulum device flange

flyweight

roller element

ring area

screw

drilling

cover

Claims

claims

1 . Torsional vibration damper (1), in particular for the drive train of a motor vehicle, with an input part (2) and with an output part (3), with a in the torque flow between the input part (2) and the output part (3) arranged spring damper means (4), characterized in that the torsional vibration damper (1), in particular the input part (2), the output part (3) and / or the spring damper device (4) or parts thereof, is made of a first element and a second element in several parts, wherein between the first element and the second member is provided with a distance (x) obtained by a spacer, the spacer being formed as a stepped portion (18) of a rivet member (15) by which the first member is connected to the second member.

2. torsional vibration damper (1) according to claim 1, characterized in that with the output part (3), a flange (5) of the spring damper device (4) is connected.

3. torsional vibration damper (1) according to claim 2, characterized in that the flange (5) with the output part (3) by means of the rivet element (15) is connected, wherein the flange (5) on the one hand of the stepped portion (18) of the rivet element ( 15) is arranged and the output part (3) on the other hand, the stepped portion (18) of the rivet element (15) is arranged.

4. torsional vibration damper (1) according to any one of the preceding claims, characterized in that between the flange (5) and the input part (2) a Reibungsdämpfungsvorrichtung (25) is arranged, which has a friction ring (26) which is located both on the flange (5) and on the input part (2) in the axial direction is supported.

5. torsional vibration damper (1) according to one of the preceding claims, characterized in that between the flange (5) and the input part (2) a cover plate (28) is arranged, which radially inwardly by means of the rivet element (15) on the flange (5) is held and radially on the outside of the input part (2) is supported.

6. torsional vibration damper (1) according to any one of the preceding claims, characterized in that further comprises a centrifugal pendulum device (30) is provided which a flange (31) and on the flange (31)

displaceably arranged flyweights (32), wherein the flange (31) is connected to the output part (3).

7. torsional vibration damper (1) according to claim 6, characterized in that the flange (31) of the centrifugal pendulum device (30) by means of the rivet element (15) with the output part (3) is connected.

8. torsional vibration damper (1) according to any one of the preceding claims, characterized in that further comprises a cover (29) is provided, which covers the centrifugal pendulum device (30) in the axial direction and the centrifugal pendulum device (30) overlaps at least partially radially on the outside.

9. torsional vibration damper (1) according to claim 8, characterized in that the cover (29) with the flange (31) of the centrifugal pendulum device (30) is connected, in particular riveted, welded or otherwise connected.

10. torsional vibration damper (1) according to one of the preceding claims, characterized in that the spring damper device (4) is designed such that the input part (2) and the flange (5) of the spring damper device (4) are arranged rotatable relative to each other and that at least one Spring (10,1 1) between the input part (2) and the flange (5) of the spring damper device (4) is arranged in the torque flow, so that the flange (5) of the spring damper device (4) counter to the restoring force of the at least one spring (10 , 1 1) relative to the input part (2) is rotatable.