DE102014217852A1 - Spring and torsional vibration damper with such a spring - Google Patents

Abstract

The invention relates to a spring, in particular helical spring, with helical turns formed from a wire material, which wind in the longitudinal extent of the spring, wherein the windings divide into two winding regions, which are arranged adjacent to each other in the axial direction, each of the winding regions two spaced from each other arranged end turns and optionally arranged therebetween intermediate turns, wherein the respective other winding area facing end turns of the two Windungsbereiche abut each other.

Description

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

Torsional vibration damper according to the prior art, an input part and an output part, which are arranged opposite to the restoring force of at least one spring rotatable relative to each other. The design of the spring decides on the behavior of the torsional vibration damper in the isolation of the torsional vibrations.

From the DE 44 06 826 B4 a torsional vibration damper with coil springs has become known, in which the coil springs are provided. The radially outwardly disposed springs are formed as long bow springs, while radially inwardly disposed springs are formed as a straight formed shorter springs. The springs are formed from a coiled wire material which is bent helically. The design of the springs is such that the turns of the coil spring over the length of the spring are constant and thus a fixed spring stiffness is effected.

However, this has the disadvantage that in a multi-stage damper different springs are used, which are active at different angles of rotation. However, this increases the assembly costs and the costs.

It is the object of the present invention to provide a spring which has a two-stage rigidity and is easy to form. It is also the object of the invention to provide a torsional vibration damper, which is designed in two stages and is simple and inexpensive to manufacture.

The object of the invention is achieved with regard to the spring with the features of claim 1.

An embodiment of the invention relates to a spring, in particular helical spring, with helical turns formed from a wire material, which wind in the longitudinal extent of the spring, wherein the windings divide into two winding regions, which are arranged adjacent to each other in the axial direction, each of the winding regions two spaced end windings and optionally arranged therebetween intermediate turns, wherein the respective other winding area facing end turns of the two Windungsbereiche abut each other. As a result, a spring is formed which, when compressed in the axial direction, exhibits a force-displacement characteristic which forms two gradients.

It when the turns of the two Windungsbereiche have a different slope is particularly advantageous. As a result, it is possible to generate a force-displacement characteristic which, for example, shows two regions with different slopes.

It is advantageous if the slope of a first turn region is greater than the slope of a second turn region.

It is also advantageous if the axial length of the two turns regions is the same or different. Thus, the characteristic curve of the spring can be adapted to the application and thus the characteristic can be adjusted.

It is also advantageous if the axial length of the first turn region is smaller than the axial length of the second turn region. This ensures that the steeper characteristic has a shorter spring travel.

It when the abutting end turns abut each other at least over half a circumference of a turn, preferably over at least a three-quarter circumference of a turn or more preferably at least over a whole circumference of a turn abut each other. Thus, a good support of the two spring portions is achieved, so that the two spring portions act independently of each other.

It is also expedient if the spaced-apart end turns of each turn area are flattened to form a flat edge area. As a result, the contact areas of the windows or pocket-like recesses of the torsional vibration damper can create uniformly at the spring ends.

The object of the invention is achieved with regard to the torsional vibration damper with the features of claim 8.

An embodiment of the invention relates to a torsional vibration damper with an input part and an output part with at least one arranged on the input side and connected to the input part disc part, and arranged with at least one output side and connected to the output part disc part, wherein in the disc parts window and / or pocket-like recesses are formed for receiving at least one spring, wherein the spring is a spring formed as a spring according to the invention. Thus, a torsional vibration damper can be achieved with improved vibration isolation.

It is particularly expedient if a spring pact is arranged in the windows and / or pocket-shaped recesses, wherein the spring pact has at least one spring according to the invention.

It is also advantageous if the spring assembly has a spring according to the invention, wherein at least one further spring is provided which is arranged radially inside and / or radially outside the spring. This allows an advantageous characteristic to be achieved, which results from the characteristics of the springs used.

The present invention will be explained in more detail below with reference to preferred exemplary embodiments in conjunction with the associated figures:

Showing:

1 a schematic representation of a spring, and

2 a schematic representation of an arrangement of the spring in a spring window of a torsional vibration damper.

The 1 shows in a schematic representation of a spring 1 and a diagram 20 , The feather 1 is designed in particular as a helical spring and consists of a wire material 2 from which the helical turns 3 are formed. The wire material 2 has a circular cross-section 4 , The cross section 4 However, it can also be otherwise formed, such as flattened, for example.

The turns 3 extend or wind in the longitudinal direction 5 the spring, so that a screw is formed, extending in the direction of the longitudinal extent 5 extends.

The turns 3 are in two winding areas 6 . 7 divided, which are arranged adjacent to each other in the axial direction. Each of the two winding areas 6 . 7 has two spaced apart end turns 8th . 9 . 10 . 11 on. Between these end turns 8th . 9 respectively. 10 . 11 are intermediate turns 12 arranged. The two end turns 8th . 11 serve the installation of the spring 1 at corresponding contact surfaces of elements of a torsional vibration damper. These can be the spaced end turns 8th . 11 each turn area 6 . 7 be formed flattened to form a flat edge region for the system.

The end turns facing the respective other winding area 9 . 10 the two winding areas 6 . 7 lie against each other. This ensures that the two end turns of the respective turn areas are coupled substantially rigidly together. The adjacent end turns 9 . 10 In this case, they rest against each other at least over half the circumference of a turn, preferably over at least a three-quarter circumference of a turn or even more preferably over at least a whole circumference of a turn. This will be a good one of the final turns 9 . 10 Support reached.

Like in the 1 It can be seen well, the slope of the turns in the winding area 6 less than the slope of the turns in the winding area 7 , The turns of the two winding areas 6 . 7 So have a different slope.

Also is in 1 to recognize that the axial length L of the two turns regions 6 . 7 is formed differently. In this case, the axial length can alternatively be the same. The axial length L of the first turn area 7 is smaller than the axial length L of the second turn region 6 ,

The spring is designed so that with an axially acting force only the turns of both Windungsbereiche 6 . 7 compress, leaving the slope 21 in the diagram 20 results. This continues until the turns of the area with the smaller slope, so the area 6 to go to block. From then on, only the turns of the area work 7 with higher rigidity. The result is the slope 22 in the diagram 20 ,

The 2 shows a section of a torsional vibration damper 30 of the page. The torsional vibration damper 30 usually has an input part and an output part, the input part is at least one disk part arranged on the input side 31 connected, wherein the output part with at least one output side arranged disc part 32 connected is. The disc parts have windows and / or pocket-like recesses 33 on which the spring 34 take up.

According to 2 is the spring 34 Part of a spring package, in which radially outside the spring 34 still the feathers 35 . 36 Are arranged, which the spring 34 in their interior.

Alternatively, at least one other spring could also be radially inside the spring 34 be arranged.

LIST OF REFERENCE NUMBERS

1

 feather

2

 wire material

3

 convolution

4

 cross-section

5

 longitudinal extension

6

 winding portion

7

 winding portion

8th

 end turn

9

 end turn

10

 end turn

11

 end turn

12

 intermediate turn

20

 diagram

21

 pitch

22

 pitch

30

 torsional vibration dampers

31

 disk part

32

 disk part

33

 recess

34

 feather

35

 feather

36

 feather

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 4406826 B4 [0003]

Claims (10)

Feather ( 1 . 34 ), in particular helical spring, with a wire material ( 2 ) helical turns ( 3 ), which wind in the longitudinal extent of the spring, the turns ( 3 ) in two winding areas ( 6 . 7 ), which are arranged in the axial direction adjacent to each other, each of the winding areas ( 6 . 7 ) two spaced apart end turns ( 8th . 9 . 10 . 11 ) and optionally intermediate windings ( 12 ), wherein the respective other winding area ( 6 . 7 ) facing end turns ( 9 . 10 ) of the two winding areas ( 6 . 7 ) abut each other. Spring according to claim 1, characterized in that the turns ( 3 ) of the two winding areas have a different pitch. Spring according to claim 2, characterized in that the pitch of a first turn area ( 7 ) is greater than the slope of a second turn area ( 6 ). Spring according to one of the preceding claims, characterized in that the axial length of the two winding regions ( 6 . 7 ) is the same or different. Spring according to claim 4, characterized in that the axial length of the first winding region ( 7 ) is smaller than the axial length of the second turn area ( 6 ). Spring according to one of the preceding claims, characterized in that the adjacent end turns ( 9 . 10 ) abut each other at least over half the circumference of a turn, preferably abutting one another over at least a three-quarter circumference of a turn or more preferably at least over a whole circumference of a turn. Spring according to one of the preceding claims, characterized in that the spaced-apart end turns ( 8th . 11 ) of each winding area ( 6 . 7 ) are flattened to form a flat edge region. Torsional vibration damper ( 30 ) with an input part and an output part with at least one input part arranged and connected to the input part disc part ( 31 ), and with at least one arranged on the output side and connected to the output part disc part ( 32 ), wherein in the disc parts ( 31 . 32 ) Windows and / or pocket-like recesses are designed to receive at least one spring ( 34 ), wherein the spring is a spring according to at least one of the preceding claims. Torsional vibration damper according to claim 8, characterized in that a spring pact in the windows and / or pocket-shaped recesses is arranged, wherein the spring pact at least one spring ( 34 ) according to one of the preceding claims. Torsional vibration damper according to claim 9, characterized in that the spring assembly comprises a spring according to one of the preceding claims, wherein at least one further spring ( 35 . 36 ) is provided, which is arranged radially inside and / or radially outside of the spring.

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