DE102010015469A1 - Spring structure of several spring elements - Google Patents

Abstract

The invention relates to a spring structure (1) comprising at least three wave-shaped ribbon springs (2), each ribbon spring (2) having reversing sections (3, 4) to form a wave shape and intermediate pieces (5) each having two consecutive reversing sections (3, 4) ) connect with each other. The aim is to provide a spring structure (1) of the type mentioned, which is self-supporting, has high buckling stability, is suitable as a high-performance spring and which can be used both with and without a rod-shaped damper unit. This object is achieved by a spring structure (1), which is characterized in that the at least three ribbon springs (2) are arranged circumferentially around the longitudinal axis (8) of the spring structure (1) and adjacent to one another in pairs to form a sleeve-shaped spring structure (1) are such that - starting from one free end (7a) of the spring structure (1) to the other free end (7b) of the spring structure (1), the reversal sections (3, 4) and the intermediate pieces (5) of each ribbon spring (2 ) alternately follow one another, with the reversal sections (3, 4) alternating - as interior reversal sections (3) - inwards and - as exterior reversal sections (4) - facing outwards, and - each ribbon spring (2) between the two free ends (7a, 7b) of the spring structure (1) to each of the two adjacent ribbon springs (2) has at least one material connection (6), so that the at least three ribbon springs (2) have a sleeve-shaped monolithic spring structure (1) form, the at least one material connection (6) being formed in the area of a reversal section (3, 4).

Description

The invention relates to a spring structure comprising at least three wave-shaped band springs, each band spring having in order to form a waveform reversing sections and intermediate pieces, each connecting two consecutive reversal sections.

The European patent application EP 2 082 903 A2 describes inter alia a wavy band spring of the aforementioned type, ie a band spring with wave-shaped course. This band spring has to form a waveform reversing sections and intermediate pieces, wherein the intermediate pieces connect successive reversal sections together.

A disadvantage of the band spring according to the EP 2 082 903 A2 is that inherently an increased risk of buckling exists. Under load, ie when a force is introduced in the direction of the longitudinal center line L, around which the band spring meanders, the band spring can easily move away to the side.

To reduce the risk of buckling, the band spring is provided in the intermediate pieces with holes which are arranged along the longitudinal center line and which are aligned with each other. Through the holes, a rod-shaped shock absorber leg is guided, which also serves as a damper and the leadership of the band spring in addition to the actual task and should prevent lateral buckling. At the ends of the band spring spring plates are provided, with which the damper is firmly connected and where the band spring is supported.

The introduction of the holes is complicated and expensive and can only after the shaping, d. H. the formation of the wavy band, done. Even if the highest stresses of the predominantly bending-stressed band spring occur in the reversal sections and not in the holes receiving spacers, the holes weaken the band spring in their strength.

In addition, the band spring rubs with the inner surfaces of the holes on the shock absorber leg, when the spring is compressed under load and relaxed again when discharged. The friction between damper strut and band is not insignificant, since the damper leg for guiding the band does not exert small lateral forces as soon as the coil spring has lost its kinking stability.

A major disadvantage of the described band spring is also to be seen in the fact that to stabilize the band spring necessarily a damper unit must be provided, d. H. the band spring can only be used in combination with a damper unit in the form of a shock absorber. In a variety of applications, however, a separation of spring and damper unit is preferred or exclusively a spring needed without damping should take place.

According to another embodiment of the EP 2 082 903 A2 a spring structure is formed using two wavy band springs. The two band springs are sandwiched on each other in such a way that the band springs touch each other in the turnaround sections. In the contact surfaces formed in this way, the band springs are connected together.

Although this embodiment is more stable, i. H. kink-proof, is as a single coil spring, the spring structure is still not self-supporting. To stabilize a rod-shaped shock absorber leg is again provided. The holes required to accommodate the damper strut are located in the interconnected reversal sections, d. H. in the most stressed areas of the two band springs.

The US 4,832,320 also describes a combined spring-damper unit in which two wave-shaped band springs and a damper cooperate. Also in the US 4,832,320 disclosed spring structure is not self-supporting. Rather, spring plates are necessary, which receive and fix the band springs at their ends, wherein the two band springs only by the spring plate a fixed arrangement, especially to each other, is awarded.

Also the European patent application EP 0 132 048 A1 has a wavy band spring to the object. Described is inter alia a spring structure comprising four wave-shaped band springs, which are arranged in pairs opposite one another, wherein the pairs are grouped in such a way that the two planes, which are spanned by the two band spring pairs, perpendicular to each other. The four band springs are connected together at the free ends of the spring structure where they converge.

Such an arrangement of the band springs and the connection at the ends to increase the rigidity and the buckling stability of the entire spring structure. In the in the EP 0 132 048 A1 graphically illustrated embodiments of the spring structure, this can still be assumed because the individual band springs have only five reversing sections. By increasing the number of waves, ie, increasing the number of turnarounds, however, can no longer be expected from a kink-proof spring structure, as the Band springs according to the EP 0 132 048 A1 between the free ends of the spring structure in their movement are completely free, in particular can buckle.

A higher number of waves may be required if a high performance spring structure capable of accommodating a large amount of energy is required, which may be the case in vehicle construction, for example.

Another disadvantage of the spring structure in question is the way in which the band springs are connected together at the free ends of the structure. The band springs run inward at the free ends of the structure in the direction of the longitudinal axis of the spring assembly. In the area of the longitudinal axis, the individual band springs meet one another and are connected to one another. In this respect, it is in the spring structure of the EP 0 132 048 A1 a closed spring structure, ie a closed spring body, in contrast to an open, shell-like, ie bangle-like structure. Consequently, it is not possible to guide a rod-shaped damper unit through the structure. In addition, the formation of the free ends requires the introduction of the force as a point load.

Against the background of the above, it is the object of the present invention, a spring structure according to the preamble of claim 1, d. H. Of the generic type, to overcome the known from the prior art problems, which in particular is self-supporting, has a high kinking stability, is suitable as a high-performance spring and which can be used both with one and without a rod-shaped damper unit, d. H. can be combined with a rod-shaped damper if necessary, but does not necessarily have to be combined.

• – ausgehend von einem freien Ende der Federstruktur hin zum anderen freien Ende der Federstruktur die Umkehrabschnitte und die Zwischenstücke jeder Bandfeder abwechselnd aufeinander folgen, wobei die Umkehrabschnitte abwechselnd – als innenliegende Umkehrabschnitte – nach innen und – als außenliegende Umkehrabschnitte – nach außen gerichtet sind, und
• – jede Bandfeder zwischen den beiden freien Enden der Federstruktur zu jeder der beiden benachbarten Bandfedern mindestens eine stoffschlüssige Verbindung aufweist, so dass die mindestens drei Bandfedern eine hülsenförmige monolithische Federstruktur bilden, wobei die mindestens eine stoffschlüssige Verbindung im Bereich eines Umkehrabschnitts ausgebildet ist.

This object is achieved by a spring structure comprising at least three wavy band springs, each band spring to form a waveform reversing sections and spacers, each connecting two consecutive reversal sections together, and characterized in that the at least three band springs circumferentially to form a sleeve-shaped spring structure the longitudinal axis of the spring structure around and in pairs adjacent to each other are arranged in such a way that

• - Starting from a free end of the spring structure toward the other free end of the spring structure, the turnarounds and the spacers of each band spring alternately follow each other, wherein the turnaround sections are alternately - as internal reversal sections - inward and - as external turnaround - outward, and
• - Each band spring between the two free ends of the spring structure to each of the two adjacent band springs at least one cohesive connection, so that the at least three band springs form a sleeve-shaped monolithic spring structure, wherein the at least one cohesive connection is formed in the region of a turnaround.

According to the invention, the band springs are sleeve-shaped for forming a spring structure, d. H. grouped in the form of a sleeve. The band springs are circumferentially, d. H. on a circumference, about the longitudinal axis of the spring structure to be built from them, next to each other, d. H. in pairs adjacent to each other, arranged. The inversion sections and the intermediate pieces of the band springs alternate along the longitudinal axis.

This type of arrangement or grouping of the band springs allows passing a rod-shaped damper unit through the sleeve-shaped spring structure and thus basically opens the use of a damper unit, if this is desired or required for a specific application.

On the other hand, the provision of such a damper unit is not absolutely necessary, in particular not to lead or support the band springs grouped to the sleeve, since the spring structure according to the invention has a high kink resistance from the house. The spring structure according to the invention is a self-supporting spring structure, which has a relatively high dimensional stability in the unloaded state, without additional stabilizing elements must be provided.

The comparison with the prior art comparatively high buckling stability is achieved by the sleeve shape and the fact that the band springs are - at least - connected to each other between the free ends of the spring structure.

Each band spring is integrally connected to each of the two adjacent band springs at least at one point. The cohesive connection is formed in each case in the region of an inversion section of the band springs and leads to the formation of a dimensionally stable spring structure in the region of the connection.

In this way, the at least three band springs form a sleeve-shaped monolithic spring structure, which has a high kink resistance and is self-supporting.

The special structure of the spring structure according to the invention, in particular the constructive Feature, according to which the band springs are materially interconnected between the ends, allows embodiments with a high number of waves, ie embodiments of the spring structure, which have more than five reversal sections, in particular more than ten or more than fifteen reversing sections may have.

Since the spring structure according to the invention is essentially subjected to bending and the highest voltages occur in the reversing sections, the spring structure is thus also suitable as a high-performance spring, which is able to absorb and store large amounts of energy.

With the spring structure according to the invention, the object underlying the invention is achieved. A spring structure is provided which overcomes the problems known from the prior art, namely that it is self-supporting, has a high buckling stability, is used as a high-performance spring and can be combined with a rod-shaped damper if required, but not necessarily combined got to.

The spring structure is constructed from at least three band springs, so that the spring structure along the longitudinal axis at least in places or in sections has a triangular or arbitrary polygonal cross-section. Namely advantageous are embodiments in which the spring structure comprises four, five, six or more band springs. Then the spring structure in the basic form approaches a cylinder.

Embodiments of the spring structure in which the at least one cohesive connection is a punk-like connection or has a line-like configuration are advantageous.

According to the invention, each band spring has at least one cohesive connection between the free ends of the spring structure for each of the two adjacent band springs. Apart from these connections between the free ends embodiments are particularly advantageous in which each band spring additionally has a cohesive connection at one or both free ends of the spring structure to each of the two adjacent band springs.

The spring structure according to the invention is suitable both as a tension spring and as a compression spring, d. H. The spring structure is suitable for absorbing tensile forces and compressive forces.

Further advantageous embodiments of the spring structure are discussed in connection with the subclaims.

Advantageous embodiments of the spring structure, in which the at least one cohesive connection is formed in the region of an inboard reversing section. If the inner reversing sections are used to form the integral connections, it is readily ensured that the band springs do not interfere with each other under load as part of their change in shape or affect, because the outer Umkehrrabschnitte can move freely in a compression of the spring structure to the outside and stretch during an expansion or discharge.

Apart from the cohesive connections, the band springs should preferably not touch as part of a change in shape, since this can disturb or endanger the functioning of the spring structure.

In principle, embodiments may also be advantageous in which the at least one cohesive connection, which has each band spring between the two free ends of the spring structure to the two adjacent band springs, is formed in the region of an external reversing section. Then, in essence, the inner inversion sections move in a change in shape and that inward, so that the spring structure in their outer dimensions - apart from the change in length - almost does not vary. When constructing the spring, it must be taken into account that the inner reversal sections move inwards when the spring structure is compressed. An inwardly directed trapezoidal taper of the inboard reversal sections can prevent the band springs from interfering with each other under load in their change in shape.

Advantageous embodiments of the spring structure, in which adjacent band springs between the two free ends of the spring structure in the region of all internal inversion sections have a material connection.

Also advantageous are embodiments of the spring structure, in which adjacent band springs between the two free ends of the spring structure in the region of all external inversion sections have a cohesive connection.

The more cohesively compounds are introduced into the spring structure, d. H. the higher the number of connections having two adjacent band springs, the more pronounced the already high buckling stability and the greater the dimensional stability of the spring structure in general.

Embodiments of the spring structure in which at least one free end of the spring structure has the at least three band springs have an inner reversing section are advantageous. This embodiment is particularly advantageous if the band springs have a material connection in pairs in the region of these inward reversal sections. This increases the dimensional stability of the spring structure, in particular the dimensional stability of the correspondingly shaped end.

Basically, the spring structure according to the invention requires at its ends no additional force-introducing or shaping elements, such as spring plate, since it is a self-supporting structure that can be used without further attachments. The spring forces are then introduced directly into the structure without interposing further elements.

For the reasons mentioned above, embodiments of the spring structure are advantageous in which the at least three band springs have an inner reversing section at both free ends of the spring structure. A cohesive connection of the inner reversing sections is also advantageous.

In principle, embodiments of the spring structure are advantageous in which adjacent at least one free end of the spring structure band springs have a material connection.

Such a structural design of one end has already been discussed above for embodiments having inboard turnarounds at one end of the structure.

A comparable embodiment can also be realized analogously in spring structures in which the at least three band springs have an external inversion section on at least one free end. The advantages are the above.

It is in turn advantageous if the present embodiment of the end, are connected in the adjacent band springs cohesively, again realized at both ends of the spring structure.

Consequently, embodiments of the spring structure are advantageous in which adjacent band springs have a cohesive connection at both free ends of the spring structure.

Advantageous embodiments of the spring structure in which the intermediate pieces in the unloaded state of the band springs with a plane which is perpendicular to the longitudinal axis of the spring structure, at least partially an angle α ≤ 20 °, preferably an angle α ≤ 10 °, form. The sharper the angle α is chosen, the more compact the spring structure can be formed. At small angles, the inversion sections are almost in folded form. Such a spring structure can absorb large amounts of energy at a small volume.

Embodiments of the spring structure may be advantageous in which the reversing sections are formed unevenly. This can be the inversion sections of different band springs, but in particular also the reversal sections of a single band spring.

Individual reversal sections may vary in shape or material, for example. Thus, the turnaround portions of a single band spring may have different thicknesses, different widths, different lengths and / or different shapes.

The nonuniform design of the reversal sections of a strip spring can be influenced on the spring characteristic of the spring structure. Differently formed reversing sections are usually different stiff. So, progressive spring characteristics can be modeled. The corresponding spring structure hardens when loaded in stages.

Embodiments of the spring structure may also be advantageous, in which the at least three band springs are of non-uniform design. Different band springs can for example be made of different materials. However, the band springs may also differ in material thickness, width, length and / or shape as described for the reversal sections.

The nonuniform design of the band springs leads to an asymmetric spring structure, which is distinguished from a symmetrical spring structure in that the line of action of the resulting spring force off-center and / or optionally employed, d. H. inclined at an angle relative to the longitudinal axis of the spring structure. In a symmetrical spring structure, the resulting spring force usually runs along the longitudinal axis.

Advantageous embodiments of the spring structure in which the at least three band springs are at least made of composite material.

Composite materials are characterized by the fact that they combine the properties of different materials in an advantageous manner, such as strength, lightweight construction and the like.

Particularly advantageous in this context are embodiments of the spring structure in which the at least three band springs are at least made of fiber-reinforced plastic.

Fiber-reinforced plastic is characterized by a very high strength and low specific weight. The specific energy intake, d. H. the weight-related energy absorption capacity is comparatively large. In addition, plastic is corrosion resistant.

Also advantageous are embodiments of the spring structure in which the at least three band springs are at least made of plastic. Especially at low loads, the band springs of the spring structure can be made of plastic.

Plastics, whether fiber reinforced or not, allow easy, d. H. a cost-effective and only a few steps comprehensive manufacture of the spring structure, for example by injection molding or in Resin Transfer Molding (RTM).

Also advantageous are embodiments of the spring structure in which the at least three band springs are at least made of metal.

Unlike plastics, metal is heat resistant, i. H. also suitable for use at higher temperatures. The higher weight, however, is usually considered a disadvantage.

The at least three band springs must not be made in accordance with the above embodiments, not uniformly made of plastic, fiber-reinforced plastic or metal, but may also be inconsistent, d. H. made of different materials.

In addition, variations and developments are conceivable, for example, the coating of a made of metal band spring with plastic for the purpose of corrosion protection.

In the following the invention will be described with reference to five exemplary embodiments according to FIGS 1 to 7 described in more detail. Hereby shows:

1 in a perspective view of a first embodiment of the spring structure,

2 in a perspective view of a second embodiment of the spring structure,

3 in a perspective view, a third embodiment of the spring structure,

4 in a perspective view of a fourth embodiment of the spring structure,

5 in a perspective view of a fifth embodiment of the spring structure,

6 the in 5 drawn cross-section YY to illustrate a first embodiment of a closing element, and

7 the in 5 drawn cross-section ZZ to illustrate a second embodiment of a closure element.

1 shows a perspective view of a first embodiment of the spring structure 1 ,

The illustrated spring structure 1 includes three wavy band springs 2 , Each band spring 2 has five reversal sections to form a waveform 3 . 4 and four intermediate pieces 5 on, with the reversing sections 3 . 4 each with an intermediate piece 5 connected to each other.

The three band springs 2 form a sleeve-shaped spring structure 1 out. These are the band springs 2 on a triangular circumference about the longitudinal axis 8th the spring structure 1 around - in pairs adjacent - juxtaposed.

The orientation of the band springs 2 is such that starting from a free end 7a the spring structure 1 to the other free end 7b the spring structure 1 the inversion sections 3 . 4 and the spacers 5 alternately follow each other. The return sections 3 . 4 are alternating - as internal reversing sections 3 - inwards and - as external inversion sections 4 - directed outwards, the spring structure 1 with an inboard reversing section 3 begins and ends.

Each band spring 2 points to each of the two adjacent band springs 2 in the area of the inner reversal sections 3 a cohesive connection 6 on, so the band springs 2 in the entirety a sleeve-shaped monolithic spring structure 1 form, which is self-supporting and has a high kink stability.

It's not just material bonds 6 between the two free ends 7a . 7b the spring structure 1 provided, but also at the two free ends 7a . 7b itself. This increases the dimensional stability of the spring structure 1 , especially the Dimensional stability of the correspondingly shaped ends 7a . 7b ,

At a compression of the spring structure 1 the outer inversion sections move 4 to the outside, to relax again when relief, ie to stretch. The inside inversion sections 3 remain almost unchanged on their circumference and thus - apart from their change in position in the direction of the longitudinal axis 8th - in their position.

If, as in the embodiment according to 1 , the inboard reversal sections 3 for the formation of cohesive connections 6 be used, it is readily ensured that the band springs 2 Under load do not interfere with each other as part of their change in shape, so that a proper functioning of the spring structure 1 is guaranteed.

At the band springs 2 the in 1 illustrated spring structure 1 are the outer inversion sections 4 inconsistently trained in the way that the inversion sections 4 are different lengths. The in 1 at the bottom 7b the spring structure 1 arranged external reversing section 4 is longer than the section above 4 so that it is less stiff.

As a result of this non-uniform configuration comes the lower outer reversing section 4 upon reaching a certain load to the plant and the suspension is alone from the upper outer reversal section 4 accepted. A progressive spring characteristic is the result.

2 shows a perspective view of a second embodiment of the spring structure 1 , It should only the differences to the in 1 Otherwise, reference will be made to FIG 1 , The same reference numerals have been used for the same components.

Unlike the in 1 The embodiment shown in FIG 2 illustrated spring structure 1 six wavy band springs 2 , each with four reversing sections 3 . 4 and four intermediate pieces 5 exhibit. The spring structure 1 due to the six band springs 2 a hexagonal section or circumference in sections. 2 discloses that the spring structure 1 in the basic form increasingly approaches a cylinder, the more band springs 2 be provided.

The spring structure 1 forms at the bottom 7b external inversion sections 4 out while the band springs 2 at the upper end 7a in the area of the intermediate pieces 5 end up.

The formation of the spring structure 1 causes two adjacent band springs 2 only two cohesive connections 6 have, as in the in 1 illustrated embodiment of the inner reversing sections 3 ,

3 shows a perspective view of a third embodiment of the spring structure 1 , It should only the differences to the in 1 Otherwise, reference will be made to FIG 1 , The same reference numerals have been used for the same components.

Unlike the in 1 The embodiment shown in FIG 3 illustrated spring structure 1 eight wavy band springs 2 , each with nine reversing sections 3 . 4 and eight intermediate pieces 5 exhibit. The spring structure 1 due to the eight band springs 2 in sections, an octagonal cross section or circumference.

4 shows in a perspective view a fourth embodiment of the spring structure 1 , It should only the differences to the in 3 Otherwise, reference will be made to FIG 3 , The same reference numerals have been used for the same components.

Unlike the in 3 embodiment shown are the cohesive compounds 6 at the outer turnaround sections 4 intended. At a compression of the spring structure 1 move the inside turnaround sections 3 inside, which is why the band springs 2 starting from an external reversing section 4 rejuvenate inside. This ensures that the reversing sections move inward under load 3 do not interfere with each other as part of their change of form.

The external inversion sections 4 remain almost unchanged on their circumference and change their position only in the direction of the longitudinal axis 8th the spring structure 1 , The spring structure 1 according to 4 is characterized by the fact that the scope of the structure 1 under load almost not enlarged.

5 shows a perspective view of a fifth embodiment of the spring structure 1 , It should only the differences to the in 3 Otherwise, reference will be made to FIG 3 , The same reference numerals have been used for the same components.

In addition to the in 3 illustrated embodiment, the in 5 shown spring structure 1 on each end 7a . 7b a separate closing element 9 in the shape of a ring 10 on.

6 shows the in 5 drawn cross section YY. That at one end 7a the spring structure 1 provided conclusion element 9 takes the band springs 2 positive locking. This points in the form of a ring 10 trained graduation element 9 on the outside unilaterally open recesses, in which the as intermediate pieces 5 trained band spring ends are inserted into it. With regard to the remaining components, reference is made to the remaining figures. The same reference numerals have been used for the same components.

7 shows the in 5 drawn cross-section ZZ and a second embodiment of a closure element 9 , Unlike the in 6 embodiment shown is between the ring 10 trained graduation element 9 and the spring structure 1 that is, the band spring ends formed a cohesive connection in the form of an adhesive bond. The ring 10 , which has a paragraph, from the top of the end 7a the spring structure 1 placed. With regard to the remaining components, reference is made to the remaining figures. The same reference numerals have been used for the same components.

LIST OF REFERENCE NUMBERS

1

spring structure

2

band spring

3

inside inversion sections

4

external inversion sections

5

spacers

6

cohesive connection

7a

a free end of the spring structure

7b

other free end of the spring structure

8th

longitudinal axis

9

termination element

10

ring

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

• EP 2082903 A2 [0002, 0003, 0008]
• US 4832320 [0010, 0010]
• EP 0132048 A1 [0011, 0012, 0012, 0014]

Claims (15)

Spring structure ( 1 ) comprising at least three wave-shaped band springs ( 2 ), each band spring ( 2 ) for forming a waveform inversion sections ( 3 . 4 ) and intermediate pieces ( 5 ), each two consecutive reversal sections ( 3 . 4 ), characterized in that the at least three band springs ( 2 ) for forming a sleeve-shaped spring structure ( 1 ) circumferentially about the longitudinal axis ( 8th ) of the spring structure ( 1 ) are arranged in pairs adjacent to each other in such a way that - starting from a free end ( 7a ) of the spring structure ( 1 ) to the other free end ( 7b ) of the spring structure ( 1 ) the return sections ( 3 . 4 ) and the intermediate pieces ( 5 ) each band spring ( 2 ) follow one another alternately, the reversal sections ( 3 . 4 ) alternately - as internal reversing sections ( 3 ) - inwards and - as external reversal sections ( 4 ) - are directed outwards, and - each band spring ( 2 ) between the two free ends ( 7a . 7b ) of the spring structure ( 1 ) to each of the two adjacent band springs ( 2 ) at least one cohesive connection ( 6 ), so that the at least three band springs ( 2 ) a sleeve-shaped monolithic spring structure ( 1 ), wherein the at least one cohesive connection ( 6 ) in the area of an inversion section ( 3 . 4 ) is trained. Spring structure ( 1 ) according to claim 1, characterized in that the at least one cohesive connection ( 6 ) in the region of an inner reversing section ( 3 ) is trained. Spring structure ( 1 ) according to claim 1, characterized in that the at least one cohesive connection ( 6 ) in the region of an external inversion section ( 4 ) is trained. Spring structure ( 1 ) according to claim 1 or 2, characterized in that adjacent band springs ( 2 ) between the two free ends ( 7a . 7b ) of the spring structure ( 1 ) in the area of all internal inversion sections ( 3 ) a cohesive connection ( 6 ) exhibit. Spring structure ( 1 ) according to one of the preceding claims, characterized in that at least one free end ( 7a ) of the spring structure ( 1 ) the at least three band springs ( 2 ) an inner reversing section ( 3 ) exhibit. Spring structure ( 1 ) according to one of the preceding claims, characterized in that the at least three band springs ( 2 ) at both free ends ( 7a . 7b ) of the spring structure ( 1 ) an inner reversing section ( 3 ) exhibit. Spring structure ( 1 ) according to one of the preceding claims, characterized in that at least one free end ( 7a . 7b ) of the spring structure ( 1 ) adjacent band springs ( 2 ) a cohesive connection ( 6 ) exhibit. Spring structure ( 1 ) according to one of the preceding claims, characterized in that adjacent band springs ( 2 ) at both free ends ( 7a . 7b ) of the spring structure ( 1 ) a cohesive connection ( 6 ) exhibit. Spring structure ( 1 ) according to one of the preceding claims, characterized in that the intermediate pieces ( 5 ) in the unloaded state of the band springs ( 2 ) having a plane which is perpendicular to the longitudinal axis ( 8th ) of the spring structure ( 1 ), at least in sections form an angle α <20 °. Spring structure ( 1 ) according to claim 9, characterized in that: α ≤ 10 ° Spring structure ( 1 ) according to one of the preceding claims, characterized in that the reversing sections ( 3 . 4 ) are formed unevenly. Spring structure ( 1 ) according to one of the preceding claims, characterized in that the at least three band springs ( 2 ) are formed unevenly. Spring structure ( 1 ) according to one of the preceding claims, characterized in that the at least three band springs ( 2 ) are at least made of composite material. Spring structure ( 1 ) according to claim 12, characterized in that the at least three band springs ( 2 ) are made at least also of fiber-reinforced plastic. Spring structure ( 1 ) according to one of claims 1 to 12, characterized in that the at least three band springs ( 2 ) are at least made of metal.

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