DE102015202424A1 - Torsional vibration damper with torque limiter - Google Patents

Abstract

The invention relates to a torsional vibration damper (1) with a Eigangsteil (2) with a primary flywheel and a counter to this against the action of a spring device (11) limited rotatable output part (3) with a secondary flywheel, wherein the spring means (11) one in an axial direction elastically prestressable, on the output part (3) by means of a ring spring carrier (5) arranged annular spring (4) which by means of an input part (2) associated urging means (6) on at least two circumferentially spaced apart positions of loading elements (7) the biasing means (6) is axially biased with a pre-load force predetermined between the input part (2) and the output part (3). In order to avoid damage to the torsional vibration damper (1) at high torques, when a predetermined torque on the input part (2) is exceeded, the loading elements (7) exceed a provided circumferential stop (13) of the annular spring (4).

Description

The invention relates to a torsional vibration damper with a Eigangsteil with a primary flywheel and a counter to this against the action of a spring means limited rotatable output part with a secondary flywheel, wherein the spring means comprises an elastically biased in an axial direction, arranged on the output part by means of a ring spring carrier annular spring, which by means of a biasing means connected to the input part is axially biased at at least two circumferentially spaced apart positions of Beaufschlagungselementen of the urging means with a predetermined between the input part and the output part biasing force.

A generic torsional vibration damper is for example from the DE 10 2012 218 877 A1 known.

The object of the invention is the advantageous development of a generic torsional vibration damper. In particular, the object of the invention to protect the torsional vibration damper from high torque inputs.

The object is solved by the subject matter of claim 1. The dependent claims give advantageous embodiments of the subject matter of claim 1 again.

The proposed torsional vibration damper includes a Eigangsteil with a primary flywheel and a counter to this against the action of a spring means limited rotatable output part with a secondary flywheel, wherein the spring means comprises an elastically biased in an axial direction, arranged on the output part by means of a ring spring carrier annular spring.

The annular spring is biased axially by means of a loading member connected to the input part, for example by means of a part connected to the input part, arranged on at least two circumferentially spaced apart Beaufschlagungselementen, such as bearings, with a predetermined between the input part and output part biasing force. In order to protect the torsional vibration damper against overloads, in particular by high torque loads, such as torque peaks, is provided when exceeding a predetermined torque at the input part that the biasing elements exceed an intended circumferential stop of the annular spring, for example in the case of rolling bearings.

Here, the ring spring in number of at least two positions working areas for the loading elements, which are limited by arranged on the spring ring carrier circumferential stops.

In order to allow exceeding of the circumferential stops at high torque loads, the ring spring carrier is formed axially elastically deformable at higher torques than the predetermined torque.

In this case, the ring spring carrier may be arranged at the radial height of the annular spring with axial clearance relative to an axially fixed component of the output part.

In other words, a torsional vibration damper is proposed in which the primary side and the secondary side rotate relative to each other. During this movement rolling bearings such as ball bearings roll on the ring spring and bend it through. This creates a spring characteristic and the torque entered into the torsional vibration damper is transmitted.

When over-torque occurs, the primary side and secondary side are further twisted by providing the ring spring carrier with a yielding rigidity. When a predetermined torque is exceeded, the ring spring carrier deviates and the rolling bearings skip over the circumferential stops each limited working areas of the annular spring, the rolling bearings in the work areas into which they have entered, functionally roll on the annular spring. This process lasts until the excess torque is reduced.

During this process, the primary side may also be formed at least slightly elastically resilient.

The invention is based on the in the 1 to 4 illustrated embodiment illustrated. Showing:

1 the upper part of a torsional vibration damper arranged about an axis of rotation in section,

2 the torsional vibration damper of 1 in over-torque operation in the same representation,

3 a view of the biasing means of the torsional vibration damper 1 during operation and at rest
and

4 a view of the biasing means of the torsional vibration of the 2 during over-torque operation.

The 1 shows the upper part of the arranged around the rotation axis d torsional vibration damper 1 on average. The entrance part 2 and the starting part 3 are against each other the spring device 11 rotatably mounted against each other. Here is the spring device 11 from the ring spring 4 , Which these receiving side receiving spring clip 5 , the input side arranged Beaufschlagungsmittel 6 with the distributed over the circumference arranged loading elements 7 in the form of rolling bearings 8th educated. The rolling bearings 8th roll on the ring spring 4 from and deform elastically axially to form an over the angle of rotation of the input part 2 and output part 3 mutually predetermined characteristic for damping rotational irregularities in the input part 2 registered torque. Here is each of the bearings 8th in a predetermined circumferential segment in the form of a working area of the annular spring 4 effective. The ring spring carrier 5 Here is enough stiff trained around the on the ring spring 4 effective axial forces of the loading elements 7 support. In normal operation of the torsional vibration damper 1 is therefore an axial play 9 between the ring spring carrier 5 and the secondary flywheel 10 set up. The stiffness of the ring spring carrier 5 is limited so that when exceeding a predetermined torque threshold, so when over-moments of the ring spring carrier 5 as in 2 represented by reduction of the axial play 9 axially elastically displaced, so that the loading elements 7 leave their work area and change depending on the torque direction of the excess torque in the circumferentially clockwise or counterclockwise adjacent workspace. Subsequently, loading elements roll during normal operation of the torsional vibration damper 1 at normal torques in this work area.

The 3 shows a view in partial development of the spring device 11 with the pressurizing agent 6 with the loading element 7 in the form of the pressurizing agent 6 rotatably arranged rolling bearing 8th at rest (right) and during operation (left) of the torsional vibration damper 1 of the 1 , At rest, the rolling bearing is 8th in abutting contact with the work area 12 the ring spring 4 , which assumes the contour corresponding to the solid lines in the unloaded state. The workspaces 12 the ring spring 4 are each by two circumferentially spaced circumferential stops 13 of the ring spring carrier 5 limited, wherein in the 3 only the left peripheral stop 13 is shown. Be entrance part 2 and output part 3 during operation of the torsional vibration damper 1 of the 1 twisted against each other, rolling the rolling bearing 8th in the directions of the double arrow 14 on the ring spring 4 for example, in the direction of the left-hand representation of the rolling bearing 8th from. As a result, the annular spring 4 axially biased axially corresponding to the dashed lines, resulting in a dependent on the angle of rotation of the input and output part characteristic.

The 4 shows a view in partial development of the torsional vibration damper 1 of the 2 when over-torque occurs. Here, the ring spring carrier 5 under the load of the rolling bearing 8th at an over torque at the peripheral stop 13 shifted from the dashed normal position in the axially elastically displaced position with the solid lines, so that one over the work area 12 Be performed beyond rotation of the input part relative to the output part and the rolling bearing 8th in the next workspace 12 ' the ring spring 4 replaced. After removal of the excess torque rolls the rolling bearing 8th regular on the workspace 12 ' from.

LIST OF REFERENCE NUMBERS

1

 torsional vibration dampers

2

 introductory

3

 output portion

4

 Ringfeder

5

 Ring spring support

6

 biasing

7

 impinging

8th

 roller bearing

9

 end play

10

 Secondary flywheel mass

11

 spring means

12

 Workspace

12 '

 Workspace

13

 circumferential abutment

14

 double arrow

d

 axis of rotation

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 102012218877 A1 [0002]

Claims (4)

Torsional vibration damper ( 1 ) with an Eigangsteil ( 2 ) with a primary flywheel and with respect to this against the action of a spring device ( 11 ) limited rotatable output part ( 3 ) with a secondary flywheel, wherein the spring device ( 11 ) an elastically biased in an axial direction, on the output part ( 3 ) by means of a ring spring carrier ( 5 ) arranged annular spring ( 4 ), which by means of a with the input part ( 2 ) ( 6 ) at at least two circumferentially spaced apart positions of biasing elements (US Pat. 7 ) of the loading means ( 6 ) with one between input part ( 2 ) and output part ( 3 ) predetermined biasing force is axially biased, characterized in that when exceeding a predetermined torque at the input part ( 2 ) the loading elements ( 7 ) an intended circumferential stop ( 13 ) of the annular spring ( 4 ) exceed. Torsional vibration damper ( 1 ) according to claim 1, characterized in that the annular spring ( 4 ) in number of at least two positions work areas ( 12 . 12 ' ) for the loading elements ( 7 ), which is supported by on the ring spring carrier ( 5 ) arranged circumferential stops ( 13 ) are limited. Torsional vibration damper ( 1 ) according to claim 1 or 2, characterized in that the ring spring carrier ( 5 ) Is formed axially elastically deformable at higher torques than the predetermined torque. Torsional vibration damper ( 1 ) according to one of claims 1 to 3, characterized in that the ring spring carrier ( 5 ) at the radial height of the annular spring ( 4 ) with axial play ( 9 ) with respect to an axially fixed component of the starting part ( 3 ) is arranged.

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