DE102016210462A1 - Clutch disc with an offset compensation device - Google Patents

Abstract

Clutch plate for a friction clutch, comprising a balancing device for compensating an offset between a first axis of rotation of an output shaft of a drive motor and a second axis of rotation of an input shaft of a transmission, wherein the compensation device comprises an input element, an intermediate element and an output element, wherein the input element with a plurality of first Leaf springs with the intermediate element and the intermediate element having a plurality of second leaf springs is connected to the output element, so that the offset between the first axis of rotation and the second axis of rotation is compensated by a bend of the first leaf springs or second leaf springs.

Description

The present invention relates to a clutch plate for a friction clutch, such as a single-disc dry clutch or dual clutch. Such friction clutches serve to interrupt a torque flow from a drive motor to a drive train of a motor vehicle.

In friction clutches for motor vehicles, there is the problem of a tolerance-related offset between a first axis of rotation of a crankshaft of the drive motor and a second axis of rotation of an input shaft of a transmission. The clutch disc of the friction clutch is centered on a spline on the input shaft of the transmission and experiences when closing the friction clutch, which is centered together with a flywheel on the output shaft of the drive motor, an offset-related transverse force. During the closing phase of the friction clutch, this offset causes friction vibrations and / or noises. The stiffnesses of the clutch disc and the input shaft of the transmission together with a mass of a pressure plate of the friction clutch form a vibratory system, which is excited by a fluctuating transverse force. In the closed state of the friction clutch, the offset is frozen and there are transverse forces that cause wear, high component loads and in idle operation acoustic problems.

For this reason, from the prior art clutch plates with torsion dampers are known, which allow a certain radial offset. However, they are expensive and can only compensate for a limited offset. Furthermore, applications with dual mass flywheels do not always require a clutch plate with torsional dampers. A rigid clutch disc has the disadvantage that they can compensate for an offset neither in idle mode nor when starting or higher torque in the closed state of the friction clutch.

For idling operation, therefore, so-called offset compensation discs have already been developed with a short damper stage acting only when idling. Disadvantage of this system is that at higher moments, the damper stage is bridged and no longer acts as an offset compensation. In addition, the circumferential clearance necessary for offset compensation may prove to be acoustically disturbing during load changes.

The object of the invention is therefore to solve the problems described with reference to the prior art at least partially and in particular to provide a clutch disc that can compensate for a larger offset than previous solutions, has no disturbing circumferential play and is radially softer than conventional clutch plates with torsional dampers ,

These objects are achieved with a clutch disc according to the features of the independent claim. Further advantageous embodiments of the clutch disc are specified in the dependent formulated claims. It should be noted that the features listed individually in the dependent claims can be combined in any technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are specified and explained in more detail in the description, wherein further preferred embodiments of the invention are shown.

The clutch disc for a friction clutch according to the invention comprises a compensation device for compensating an offset between a first axis of rotation of an output shaft of a drive motor and a second axis of rotation of an input shaft of a transmission, wherein the compensation device comprises an input element, an intermediate element and an output element, wherein the input element with a plurality of first leaf springs with the intermediate element and the intermediate element with a plurality of second leaf springs is connected to the output element, so that the offset between the first axis of rotation and the second axis of rotation is compensated by a bend of the first leaf springs or second leaf springs.

The proposed here clutch plate is used in particular in a friction clutch of a motor vehicle. Such friction clutches may in particular be a single-disc dry clutch or a dual clutch which serves to interrupt a torque flow from a drive motor, in particular an internal combustion engine, to a drive train of the motor vehicle. For this purpose, the friction clutch preferably has a clutch cover and a pressure plate, which consist in particular of metal and / or sheet metal. The pressure plate is adjustable for frictional pressing of the clutch disc to a connectable to an output shaft of the drive motor counter pressure plate by means of a disc spring.

The clutch disc has a compensation device for compensating for an offset between a first axis of rotation of the output shaft of the drive motor and a second axis of rotation of an input shaft of a transmission. This balancing device comprises an input element, an intermediate element and an output element. at The input element is in particular a drive plate of the friction clutch, which can be fastened in a rotationally fixed manner by means of rivets to a friction disk of the friction clutch. The input member is rotatably connected to the intermediate member with a plurality of first leaf springs so that torque from the input member is transferable to the intermediate member via the plurality of first leaf springs. The input element is in particular connected via two first leaf spring packets to the intermediate element, wherein each first leaf spring packet comprises a plurality of stacked first leaf springs. The intermediate element is also in particular at least partially annular and / or consists at least partially of metal and / or sheet metal. The intermediate element is in turn rotatably connected via a plurality of second leaf springs with the output element, so that the torque from the intermediate element to the output element is transferable. The intermediate element is in particular connected to the output element via two second leaf spring packets, wherein each second leaf spring element comprises a plurality of second leaf springs stacked on one another. The output element is in particular a hub flange of the friction clutch, which is non-rotatably, for example caulked or welded, connected to a hub of the friction clutch. An offset between the first axis of rotation and the second axis of rotation is thus compensated by a bend of the first leaf springs and / or second leaf springs. The connection between the input element, the intermediate element and the output element via the plurality of first leaf springs and a plurality of second leaf springs is in particular designed in the manner of a cardan bearing with two intersecting mutually perpendicular bearings.

Moreover, it is advantageous if the input element has at least one first attachment section for the first leaf springs and the output element has at least one second attachment section for the second leaf springs and wherein the at least one second attachment section is offset by an angle of 90 ° about an axis of rotation of the clutch disc to the at least a first attachment portion is arranged. It is thus in particular a gimbal balancing device.

The at least one first fastening section is a region of the input element to which the first leaf springs, in particular by means of first rivets, can be fastened. The at least one second fastening section is in particular a region of the output element to which the second leaf springs, in particular by means of second rivets, can be fastened. The input element preferably has two first fastening sections and the output element has two second fastening sections. The at least one first attachment portion and / or the at least one second attachment portion may in particular be designed in the manner of tabs which extend parallel to the axis of rotation or the axis of rotation of the clutch disc from the input element or output element.

Furthermore, it is advantageous if the intermediate element has at least one third fastening section for the first leaf springs and at least one fourth fastening section for the second leaf springs. The at least one third attachment section is a region of the intermediate element to which the first leaf springs, in particular by means of the first rivet, can be fastened. The at least one fourth fastening section is, in particular, a region of the intermediate element to which the second leaf springs, in particular by means of the second rivet, can be fastened. The intermediate element preferably has two third fastening sections and two fourth fastening sections. The at least one third attachment portion and / or the at least one fourth attachment portion are formed in particular in the manner of a tab, which extend parallel to the axis of rotation or axis of rotation of the clutch disc of the intermediate element.

Furthermore, it is advantageous if the at least one third fastening section is oriented orthogonally to the at least one fourth fastening section.

It is also advantageous if the first fastening section, the second fastening section, the third fastening section or the fourth fastening section extend parallel to an axis of rotation of the coupling disk.

In addition, it is advantageous if the first leaf springs are oriented orthogonally to the second leaf springs.

Furthermore, it is advantageous if the first leaf springs and second leaf springs are bendable in a radial direction of the clutch disc.

Moreover, it is advantageous if a torque of the input element via the first leaf springs and the second leaf springs is transferable to the output element.

Preferably, the first leaf springs by a tensile load or compressive load of the second leaf springs or the second leaf springs by a tensile load or compressive load of the first leaf springs bendable.

It is particularly advantageous if an angular offset between the first axis of rotation of the output shaft of the drive motor and the second axis of rotation of the input shaft of the transmission can be compensated by a torsion of the first leaf springs or the second leaf springs.

The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the figures show a preferred variant of the invention, but this is not limited thereto. The same components are provided in the figures with the same reference numerals. They show by way of example and schematically:

1 : an exploded view of a clutch disc;

2 a perspective view of the clutch disc; and

3 : a compensation device of the clutch disc in a plan view.

The 1 shows a clutch disc 1 in an exploded view. The clutch disc 1 has a friction disc 17 with friction linings 18 on. In a closed or slipping friction clutch is a torque of the friction linings 18 on with these connected spring segments 19 transfer. These spring segments 19 are about third rivets 16 at an input element 3 a balancing device 2 secured against rotation. At the input element 3 this is a driver disk. The input element 3 has two first attachment portions 8th on, over which the input element 3 with first leaf springs 6 at an intermediate element 4 the equalization device 2 rotatably connected. The first two attachment sections 8th of the input element 3 are formed here on the type of tabs, which are parallel to a rotation axis 10 the clutch disc 1 extend. The first leaf springs 6 are also available as two first leaf spring packs, each with four first leaf springs 6 by means of first rivet 14 at the entrance element 3 and the intermediate element 4 fixable. The first leaf springs 6 This allows a torque from the input element 3 on the intermediate element 4 transfer.

For fixing the first leaf springs 6 at the intermediate element 4 has the intermediate element 4 two third attachment sections 11 on. Furthermore, the intermediate element 4 two fourth fastening sections 12 on, over which the intermediate element 4 with two second leaf spring packs, each with four stacked second leaf springs 7 at an output element 5 the equalization device 2 is rotatably attached.

For fixing the second leaf springs 7 indicates the starting element 5 two second attachment sections 9 on, depending on the type of tabs parallel to the axis of rotation 10 extend. The second leaf springs 7 are by second rivet 15 at the intermediate element 4 and the output element 5 attached. The torque is thus of the intermediate element 4 on the starting element 5 transferable. At the output element 5 this is a hub flange that rotates with a hub 20 connected is. The two second attachment sections 9 of the starting element 5 are at an angle of 90 ° about the axis of rotation 10 offset to the first two attachment sections 8th of the input element 3 arranged.

The 2 shows a perspective view of the clutch disc 1 , To recognize here are in particular the first leaf springs 6 with which the input element 3 and the intermediate element 4 connected, and the second leaf springs 7 with which the intermediate element 4 and the starting element 5 are connected.

The 3 shows the area of the balancing device 2 the clutch disc 1 in a top view. The hub 20 is shifted in the Y direction as a result of an offset between a not shown here first axis of rotation of an output shaft of a drive motor and a second rotation axis, not shown here, an input shaft of a transmission. This shift is via the second leaf springs 7 radially in the intermediate element 4 transmitted by tensile forces or compressive forces. The first leaf springs 6 are thereby deformed or bent, so that the offset between the first axis of rotation and the second axis of rotation is compensated. As the clutch disc 1 rotates relative to the offset direction in operation of a friction clutch, not shown here, change the first leaf springs 6 and the second leaf springs 7 permanently in their load type. As a result, a radial compliance can be displayed even under high torques. An angular offset between the first axis of rotation of the output shaft of the drive motor and the second axis of rotation of the input shaft of the transmission can also via a twist of the first leaf springs 6 and / or second leaf springs 7 be compensated.

By the present invention, a larger offset than in previous solutions can be compensated. In addition, no disturbing circumferential play and the clutch disc is radially softer than conventional clutch discs with torsional dampers.

LIST OF REFERENCE NUMBERS

1

 clutch disc

2

 balancer

3

 input element

4

 intermediate element

5

 output element

6

 first leaf springs

7

 second leaf springs

8th

 first attachment section

9

 second attachment section

10

 axis of rotation

11

 third attachment section

12

 fourth attachment section

13

 radial direction

14

 first rivet

15

 second rivet

16

 third rivet

17

 friction

18

 friction lining

19

 spring segments

20

 hub

Claims (10)

Clutch disc ( 1 ) for a friction clutch, comprising a compensating device ( 2 ) for compensating an offset between a first axis of rotation of an output shaft of a drive motor and a second axis of rotation of an input shaft of a transmission, wherein the compensation device ( 2 ) an input element ( 3 ), an intermediate element ( 4 ) and an output element ( 5 ), wherein the input element ( 3 ) with a plurality of first leaf springs ( 6 ) with the intermediate element ( 4 ) and the intermediate element ( 4 ) with a plurality of second leaf springs ( 7 ) with the starting element ( 5 ), so that the offset between the first axis of rotation and the second axis of rotation by a bend of the first leaf springs ( 6 ) or second leaf springs ( 7 ) is compensable. Clutch disc ( 1 ) according to claim 1, wherein the input element ( 3 ) at least a first attachment portion ( 8th ) for the first leaf springs ( 6 ) and the starting element ( 5 ) at least one second attachment portion ( 9 ) for the second leaf springs ( 7 ) and wherein the at least one second attachment portion ( 9 ) at an angle of 90 ° about a rotation axis ( 10 ) of the clutch disc ( 1 ) offset to the at least one first attachment portion ( 8th ) is arranged. Clutch disc ( 1 ) according to one of the preceding claims, wherein the intermediate element ( 4 ) at least a third attachment portion ( 11 ) for the first leaf springs ( 6 ) and at least a fourth attachment portion ( 12 ) for the second leaf springs ( 7 ) having. Clutch disc ( 1 ) according to claim 3, wherein the at least one third attachment portion ( 11 ) orthogonal to the at least one fourth attachment portion (FIG. 12 ) is oriented. Clutch disc ( 1 ) according to claim 2 or 3, wherein the first attachment portion ( 8th ), the second attachment section ( 9 ), the third attachment section ( 11 ) or the fourth attachment section ( 12 ) parallel to a rotation axis ( 10 ) of the clutch disc ( 1 ). Clutch disc ( 1 ) according to one of the preceding claims, wherein the first leaf springs ( 6 ) orthogonal to the second leaf springs ( 7 ) are oriented. Clutch disc ( 1 ) according to one of the preceding claims, wherein the first leaf springs ( 6 ) and second leaf springs ( 7 ) in a radial direction ( 13 ) of the clutch disc ( 1 ) are bendable. Clutch disc ( 1 ) according to one of the preceding claims, wherein a torque of the input element ( 3 ) over the first leaf springs ( 6 ) and the second leaf springs ( 7 ) on the output element ( 5 ) is transferable. Clutch disc ( 1 ) according to one of the preceding claims, wherein the first leaf springs ( 6 ) by a tensile load or compressive load of the second leaf springs ( 7 ) or the second leaf springs ( 7 ) by a tensile load or compressive load of the first leaf springs ( 6 ) are bendable. Clutch disc ( 1 ) according to one of the preceding claims, wherein an angular offset between the first axis of rotation of the output shaft of the drive motor and the second axis of rotation of the input shaft of the transmission by a twist of the first leaf springs ( 6 ) or the second leaf springs ( 7 ) is compensable.

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