DE102010050065A1 - Fiber composite plate spring, has fiber layers moistened with resin and arranged one above other such that layers with axial end form axial end of spring and do not obtain another axial end of spring with another axial end of layers - Google Patents

Abstract

The spring (10) has fiber layers (6-9) moistened with synthetic resin and arranged alternately one above the other such that the fiber layers with an axial end (FE1) form an axial end (BE1) of the spring and do not obtain another axial end (BE2) of the spring with another axial end (FE2) of the layers. The fiber layers are arranged in an area of a neutral fiber (NF) of the spring, and extend from the former axial end to the latter axial end of the spring. The fiber layers comprise length of 1.4 m and maximum thickness of 0.16 m, where the neutral fiber comprises thickness of 0.08 m. An independent claim is also included for a method for manufacturing a plate spring from fiber composite material.

Description

The invention relates to a leaf spring made of a fiber composite material, consisting of a plurality of wetted with a synthetic resin fiber layers, wherein different lengths of fiber layers are arranged one above the other. Moreover, the invention relates to a method for producing such a leaf spring.

Generic leaf springs are for example from the DE 1 231 967 A1 . EP 0 225 485 B1 . US 3,900,357 B1 and the JP 61-149 631 A1 known. These fiber composite leaf springs have a substantially rectangular cross-section of an axially different thickness, wherein the largest thickness is present in the region of the axial center of the leaf spring. The thickness profile of such a leaf spring is usually such that it steadily increases from one axial end of the leaf spring, reaches a maximum in the center and then drops to the other axial end again to a minimum. The differences in thickness in the leaf spring are realized by stacking different numbers of different lengths and different fiber layers. In this case, in the region of the axial center of the leaf spring, more and shorter fiber layers lie one above the other than in the region of their axial ends.

If such a fiber composite leaf spring to be optimized in terms of their suspension and weight properties, the skilled person is endeavored to adapt the geometry of the leaf spring to an ideal course, which can be calculated from an operating load profile for the leaf spring. This results in a structure of a fiber composite sheet spring according to the prior art to the fact that even very short fiber layers must be used to form the axially thickest portion of the leaf spring. For it is known from analyzes that the fibers arranged on or at the thickest points of such a leaf spring are very advantageous for mechanical reasons. However, very short fiber layers are very difficult to lay accurately, so that a lot of time is required for a manual production. In an automated machine production of such a fiber composite leaf spring, however, the cost of the automatic handling machines to be provided is very large. In addition, it has been shown that very short fiber layers, ie in the range of 0.5 cm to 10 cm, axially slip in the manufacture of the leaf spring. Therefore, a fiber composite leaf spring, which has the previously known structure, although having a largely optimal geometry, but their thickest points do not contribute greatly to the desired leaf spring properties because of the very short fiber layers and possibly slipped fiber layers.

Against this background, the present invention seeks to provide a leaf spring made of a fiber composite material having a thickening portion which is formed without the use of very short fiber layers. Nevertheless, the thickening should also have an optimum fiber volume fraction at its thickest point. Another object is to describe a method of manufacturing such a leaf spring.

The solution of these objects results from the features of the independent claims. Advantageous developments are described in the associated subclaims.

Accordingly, the invention initially relates to a leaf spring made of a fiber composite material, consisting of a plurality of wetted with a synthetic resin fiber layers, wherein different lengths of fiber layers to form a predetermined thickness profile of the leaf spring are arranged one above the other. To optimize the leaf spring, in particular with regard to their mechanical spring properties and in terms of their weight, is provided according to the invention that the different lengths of fiber layers are alternately arranged one above the other so that they form with one axial end of the first axial end of the leaf spring and with their other axial end does not reach the second axial end of the leaf spring.

Preferably, each fiber layer has a plurality of individual fibers arranged one above the other and next to one another. However, it can also be provided that the fiber layers consist of individual fiber strands (rovings) or fiber fabrics, for example a unidirectional fabric. The fiber layers together with the synthetic resin form a fiber composite material, which is constructed, for example, from glass fibers and an epoxy resin. The use of known prepregs for forming the fiber layers is advantageous.

With the design principle defined by the invention, almost any desired thickness geometry of a fiber composite leaf spring can be realized, without having to use short or even very short fibers or fiber layers. If the location with the greatest thickness of the leaf spring as usual should be formed in the region of the axial center, the shortest one end of the leaf spring forming fibers or fiber layers are slightly longer than half the axial length of the leaf spring. This will be explained further below on exemplary embodiments.

In a particularly preferred embodiment of the invention, it is provided that the differently long fiber layers with their other, so not axial end end axially overlap the axial center of a thickening of the leaf spring, without reaching the opposite second axial end of the leaf spring. As a result, a particularly good force transmission between the fibers of the fiber layers is achieved in the overlap region of the fiber layers of different lengths.

According to another embodiment of the invention it is provided that in addition to those fibers or fiber layers which do not extend from one axial end to the other axial end of the leaf spring, such fiber layers or fibers are arranged in the leaf spring, extending from an axial End up to the other axial end of the leaf spring. These fibers or fiber layers are arranged according to a preferred variant in the region of the middle of the thickness of the leaf spring, so rather close above and close to the neutral fiber of the leaf spring.

Further, it is preferably provided that the different lengths of fibers or fiber layers, which form an axial end of the leaf spring, are arranged one above the other to construct the leaf spring, that starting from the neutral fiber of the leaf spring with increasing thickness of the leaf spring ever shorter fiber layers are alternately superimposed , The respective length of the fibers or fiber layers determines the formation of the thickness geometry of the leaf spring.

According to a first variant can be provided that at least one fiber layer with a certain length at one axial end of the leaf spring is flush, and that over this fiber layer at least one further fiber layer with the same length at the other end of the leaf spring is flush. Accordingly, of two fiber layers of the same length one fiber layer left-aligned and the other fiber layer arranged right-justified. The fibers or fiber layers which do not extend to the axial end of the leaf spring overlap in the region of the thickening formed.

According to a second variant, it is provided that at least one fiber layer with a certain length rests flush on one axial end of the leaf spring, and that over this fiber layer at least one other fiber layer lies flush with the other end at the other end of the leaf spring. Accordingly, two fiber layers of different lengths are alternately left-aligned and right-justified one above the other. The fibers or fiber layers which do not extend to the axial end of the leaf spring overlap in the region of the thickening formed.

Another development provides that in the leaf spring fiber layers are additionally arranged, which reach neither of the two axial ends of the leaf spring. These fiber layers are preferably located far from the top and the bottom and away from the neutral fiber of the finished leaf spring and contribute to the geometric design of the leaf spring.

According to another embodiment, it is provided that the axial region of the leaf spring, in which its uppermost fiber layer in the thickening covers the underlying fiber layer, amounts to at least 5% of the axial extension of the thickening.

The leaf spring produced by the described mutual superposition of fiber layers may have a thickening with its thickest point in the region of its axial center, at its end-side clamping areas or in between.

It is judged advantageous if it is provided that in each case at least one fiber layer is arranged on the upper side and on the underside of the leaf spring, which extends to both ends of the leaf spring. This ensures that the upper side or the lower side of the leaf spring has a homogeneous and smooth or step-free structure.

The inner structure of a leaf spring produced by way of example according to the invention accordingly provides for the use of different, alternately layered fiber layers, namely the fiber layers of different length, which form with one axial end the first axial end of the leaf spring and with its other axial end the second reach axial end of the leaf spring, and those fiber layers which extend to both ends of the leaf spring, and those fiber layers which reach neither of the two axial ends of the leaf spring.

More specifically, a leaf spring according to the invention is formed, which is characterized in that starting from the neutral fiber of the leaf spring first such fiber layers are arranged, which extend to both ends of the leaf spring, that with increasing thickness symmetrical to the neutral fiber several such different long Fiber layers are arranged, which form with its one axial end, the first axial end of the leaf spring and not reach the second axial end of the leaf spring with its other axial end, that then again such fiber layers are arranged, which extend to both ends of the leaf spring, that then fiber layers are arranged in the leaf spring, which reach neither of the two axial ends of the leaf spring, then that such fiber layers are arranged, which extend to both ends of the leaf spring, that then several such different length fiber layers are arranged, which with their one axial end form the first axial end of the leaf spring and not reach the second axial end of the leaf spring with its other axial end, and then finally each at least one fiber layer is disposed on the top and bottom of the leaf spring, which extends to both ends the leaf spring extend.

Another specific embodiment of the invention provides a leaf spring, which is characterized in that starting from the neutral fiber of the leaf spring first such fiber layers are arranged, which extend to both ends of the leaf spring, that with increasing thickness symmetrical to the neutral fiber more such Are arranged differently long fiber layers in the leaf spring, which reach neither of the two axial ends of the leaf spring, then at least one such fiber layer is arranged, which extends to both ends of the leaf spring, that then several such different lengths of fiber layers are arranged, which with their axial end form the first axial end of the leaf spring and not reach with its other axial end of the second axial end of the leaf spring, then that such fiber layers are arranged, which extend to both ends of the leaf spring, that then several such different lengths Fiber layers are arranged, which form with its one axial end, the first axial end of the leaf spring and not reach the second axial end of the leaf spring with its other axial end, and then finally each at least one fiber layer at the top and at the bottom of the leaf spring is arranged, which extends to both ends of the leaf spring.

• a) Zuschneiden von Faserlagen unterschiedlicher Länge,
• b) Ablegen der kürzesten Faserlage in eine Form, wobei ein axiales Ende dieser Faserlage ein erstes axiales Ende der Blattfeder bildet aber das zweite axiale Ende der Blattfeder nicht erreicht,
• c) Ablegen der nächst längeren Faserlage in die Form und auf die vorherige Faserlage, wobei ein axiales Ende dieser weiteren Faserlage das zweite axiale Ende der Blattfeder bildet aber das erste axiale Ende der Blattfeder nicht erreicht,
• d) weiter wechselweises Ablegen immer längerer dieser Faserlagen übereinander, bis wenigstens eine Faserlage in die Form abgelegt wird, die sich von einem ersten axialen Ende bis zu dem zweiten axialen Ende der Blattfeder erstreckt,
• e) wechselweises Ablegen immer kürzerer Faserlagen übereinander in der Form, wobei diese Faserlagen mit einem ihrer axialen Enden das erste axiale Ende oder das zweite axiale Ende der Blattfeder bilden, aber das andere axiale Ende der Blattfeder nicht erreichen, solange, bis die gewünschte Blattfederdicke erreicht ist.

The invention also relates to a first method for producing a fiber composite leaf spring having the features of claim 1, which is characterized by the following method steps:

• a) cutting fiber layers of different lengths,
• b) depositing the shortest fiber layer in a mold, wherein an axial end of this fiber layer forms a first axial end of the leaf spring but does not reach the second axial end of the leaf spring,
• c) depositing the next longer fiber layer in the mold and on the previous fiber layer, wherein an axial end of this further fiber layer forms the second axial end of the leaf spring but does not reach the first axial end of the leaf spring,
• d) further alternately depositing ever longer of these fiber layers one above the other until at least one fiber layer is deposited in the mold, which extends from a first axial end to the second axial end of the leaf spring,
• e) alternately depositing ever shorter fiber layers one above the other in the form, said fiber layers form the first axial end or the second axial end of the leaf spring with one of its axial ends, but not reach the other axial end of the leaf spring, until the desired leaf spring thickness is reached is.

A leaf spring produced by this method has a symmetrical thickness course around its neutral fiber, since below and above the neutral fiber, shorter and shorter fiber layers are arranged one above the other.

If a fiber composite leaf spring is to be produced which has no thickening on one side of its neutral fiber and thickening on the opposite side, the following process steps are necessary:

• f) cutting fiber layers of different lengths,
• g) depositing fiber layers in a shape extending from the first axial end (BE1) to the second axial end of the leaf spring,
• h) alternately depositing ever shorter fiber layers one above the other in the form, said fiber layers form the first axial end or the second axial end of the leaf spring with one of its axial ends, but not reach the other axial end of the leaf spring, until the desired leaf spring thickness is reached ,

Two leaf spring semi-finished products manufactured according to process steps f) to h) can be connected to one another according to a variant of the method on their flat undersides. This can be done, for example, by gluing two already hardened leaf spring semi-finished products, or by superimposing two leaf spring semi-finished products, which are each constructed of prepregs and not yet completely set.

In these two methods may additionally be provided that the top and / or the underside of the leaf spring is formed by the storage of at least one fiber layer which extends from the first axial end to the second axial end of the leaf spring.

• i) Zuschneiden von Faserlagen unterschiedlicher Länge,
• j) Ablegen von wenigstens einer Faserlage in einer Form, welche sich bis zu beiden Enden der Blattfeder erstreckt,
• k) darauf Ablegen wenigstens einer Faserlage, welche mit ihrem einen axialen Ende das erste axiale Ende der Blattfeder bildet und mit ihrem anderen axialen Ende das zweite axiale Ende der Blattfeder nicht erreicht,
• l) darauf Ablegen von wenigstens einer Faserlage, welche sich bis zu beiden Enden der Blattfeder erstreckt,
• m) darauf Ablegen von wenigstens einer Faserlage, welche keines der beiden axialen Enden der Blattfeder erreicht, wobei die Länge dieser Faserlagen in Richtung zur neutralen Faser immer größer wird,
• n) darauf Ablegen von wenigstens einer Faserlage, welche sich bis zu beiden Enden der Blattfeder erstreckt,
• o) darauf Ablegen wenigstens einer Faserlage, welche mit ihrem einen axialen Ende das erste axiale Ende der Blattfeder bildet und mit ihrem anderen axialen Ende das zweite axiale Ende der Blattfeder nicht erreicht,
• p) darauf Ablegen von wenigstens einer Faserlage, welche sich bis zu beiden Enden der Blattfeder erstreckt, und
• q) weiter mit den Verfahrensschritten i) bis o) in umgekehrter Reihenfolge, bis die Blattfeder vollständig aufgebaut ist.

Another method for producing a fiber composite leaf spring according to the invention provides the following method steps:

• i) cutting fiber layers of different lengths,
• j) depositing at least one fiber layer in a shape which extends to both ends of the leaf spring,
• k) depositing at least one fiber layer which forms with its one axial end the first axial end of the leaf spring and with its other axial end does not reach the second axial end of the leaf spring,
• l) depositing at least one fiber layer which extends to both ends of the leaf spring,
• m) depositing at least one fiber layer which does not reach either of the two axial ends of the leaf spring, the length of these fiber layers increasing in the direction of the neutral fiber,
• n) depositing at least one fiber layer which extends to both ends of the leaf spring,
• o) depositing at least one fiber layer which forms the first axial end of the leaf spring with its one axial end and does not reach the second axial end of the leaf spring with its other axial end,
• p) depositing thereon at least one fiber layer which extends to both ends of the leaf spring, and
• q) continue with the steps i) to o) in reverse order until the leaf spring is completely assembled.

• r) Zuschneiden von Faserlagen unterschiedlicher Länge,
• s) Ablegen von wenigstens einer Faserlage in einer Form, welche sich bis zu beiden Enden der Blattfeder erstreckt,
• t) darauf Ablegen wenigstens einer Faserlage, welche mit ihrem einen axialen Ende das erste axiale Ende der Blattfeder bildet und mit ihrem anderen axialen Ende das zweite axiale Ende der Blattfeder nicht erreicht,
• u) darauf Ablegen von wenigstens einer Faserlage, welche sich bis zu beiden Enden der Blattfeder erstreckt,
• v) darauf Ablegen wenigstens einer Faserlage, welche mit ihrem einen axialen Ende das erste axiale Ende der Blattfeder bildet und mit ihrem anderen axialen Ende das zweite axiale Ende der Blattfeder nicht erreicht,
• w) darauf Ablegen von wenigstens einer Faserlage, welche sich bis zu beiden Enden der Blattfeder erstreckt,
• x) darauf Ablegen von wenigstens einer Faserlage, welche keines der beiden axialen Enden der Blattfeder erreicht, wobei die Länge dieser Faserlagen bis zum Erreichen der neutralen Faser immer größer wird,
• y) darauf Ablegen von wenigstens einer Faserlage, welche sich bis zu beiden Enden der Blattfeder erstreckt, und
• z) weiter mit den Verfahrensschritten r) bis x) in umgekehrter Reihenfolge, bis die Blattfeder vollständig aufgebaut ist.

A fiber composite leaf spring according to the invention can also be produced with the following process steps:

• r) cutting fiber layers of different lengths,
• s) depositing at least one fiber layer in a shape extending to both ends of the leaf spring,
• t) depositing at least one fiber layer which forms the first axial end of the leaf spring with its one axial end and does not reach the second axial end of the leaf spring with its other axial end,
• u) depositing at least one fiber layer which extends to both ends of the leaf spring,
• v) depositing at least one fiber layer which forms the first axial end of the leaf spring with its one axial end and does not reach the second axial end of the leaf spring with its other axial end,
• w) depositing thereon at least one fiber layer which extends to both ends of the leaf spring,
• x) depositing at least one fiber layer which does not reach either of the two axial ends of the leaf spring, the length of these fiber layers becoming larger and larger until the neutral fiber is reached,
• y) depositing thereon at least one fiber layer which extends to both ends of the leaf spring, and
• z) continue with the steps r) to x) in reverse order until the leaf spring is completely assembled.

In the case of the latter two methods as well, it can be provided that the upper side and / or the underside of the leaf spring is formed by the support of at least one fiber layer which extends from the first axial end to the second axial end of the leaf spring.

Finally, it is provided that the fiber layers are wetted before or after their trimming with a synthetic resin, and that the leaf spring is pressed and set in the mold under the action of a predetermined temporal temperature and pressure profile. The leaf spring can also be made without a mold after the mentioned process steps.

To further explain the invention, the description is accompanied by a drawing. In this shows

1 a schematic longitudinal section through a fiber composite sheet spring with a structure according to the prior art,

2 a schematic longitudinal section through an inventively constructed fiber composite leaf spring,

3 a schematic section of a laying plan for fiber layers for producing a leaf spring according to the invention according to a first embodiment,

4 a schematic section of a laying plan for fiber layers for producing a leaf spring according to the invention according to a second embodiment,

5 a schematic section of a laying plan for fiber layers for producing a leaf spring according to the invention according to a third embodiment,

6 a schematic section of a laying plan for fiber layers for producing a leaf spring according to the invention according to a fourth embodiment, and

7 a schematic section of a laying plan for fiber layers for producing a leaf spring according to the invention according to a fifth embodiment.

Accordingly, in 1 the structure of a known fiber composite leaf spring 1 shown schematically. This leaf spring 1 has a greater thickness D in its central portion than at its axial ends. This thickening of the leaf spring 1 is by superimposing ever shorter fiber layers 3 . 4 been formed, with all these fiber layers 3 . 4 shorter than the axial length L1 of the leaf spring 1 are. The short fiber layers 3 . 4 are over other, long fiber layers 2 the leaf spring arranged, these long fiber layers 2 from one axial end to the other axial end of the leaf spring 1 extend. Therefore, there is the shortest fiber layer 4 with a length In at the thickest point of the leaf spring 1 while the underlying fiber layers Ln-i are consecutively longer. This is an example of the second fiber layer 4 with the length Ln-1 and the fifth fiber layer 3 recognizable, which has a length Ln-5.

The number of said fiber layers is only an example and is used in particular in conjunction with the drawing figures for a clear representation of the structure of the leaf spring.

As described above, is at this known fiber composite leaf spring 1 disadvantageous that the upper short fiber layers 4 must be so short for an optimal geometry of the leaf spring that they are on the one hand difficult to handle and accurately stored, and that these short fiber layers 4 due to their short contact length to the underlying fiber layer can contribute little to the transmission of forces.

Deviating from this follows the fiber composite leaf spring 10 according to the invention as shown in the other figures another structure. Also in this fiber composite leaf spring 10 are located above and below the neutral fiber NF fiber layers 5 which extend from one axial end BE1 to the other axial end BE2 of the leaf spring. To form a symmetrical thickening D of the leaf spring are above and below the neutral fiber NF, ie in the middle of the thickness, more fiber layers 6 . 7 . 8th . 9 alternately superimposed, which are always shorter in the direction of the greatest thickness D of the leaf spring. 2 shows the ever decreasing lengths 12 . 13 . 14 and 15 the fiber layers 6 . 7 . 8th and 9 , It is clearly recognizable that the different lengths of fiber layers 6 . 7 . 8th . 9 are arranged alternately one above the other, that with their one axial end FE1, the first axial end BE1 of the leaf spring 10 form and with its other axial end FE2, the axial center of a thickening D of the leaf spring 10 axially overlap, without the opposite second axial end BE2 of the leaf spring 10 to reach. As a result, a thickening region having the length LD and the maximum thickness D is formed, for the construction of which comparatively long, readily deployable and force-transmitting fiber layers were used.

In 3 By way of example, an axially central section of a schematic laying plan for fiber layers for producing a fiber composite leaf spring according to the invention is shown, which has a length of 1.4 m and a maximum thickness D of 0.16 m. Accordingly, the neutral fiber NF of the leaf spring is at a thickness of 0.08 m, and above and below this neutral fiber NF are each two fiber layers 5 deposited one above the other, the fibers of which extend from one axial end BE1 to the opposite axial end BE2 of the leaf spring. In addition, with increasing thickness D, ever shorter fiber layers 6 . 7 . 8th . 9 alternately superimposed, with one end FE2 an axial end BE1, BE2 of the leaf spring 10 form. Although their length is sufficient in each case to the axial center of the leaf spring 10 but not around the other axial end BE2, BE1 of the leaf spring 10 to reach.

With this layer structure, a leaf spring 10 be prepared when using preferably quite thin and sufficiently many fiber layers 5 . 6 . 7 . 8th . 9 has a predetermined optimum geometry, and the fiber layers are sufficiently long to those in the operation of the leaf spring 10 to be able to pass on occurring forces very well. In addition, the laying of the relatively long compared to the prior art fiber layers 6 . 7 . 8th . 9 be carried out in the thickening LD with relatively simple technical means precise and inexpensive. This is due to the fiber layers of the 3 shown embodiment, in which the shortest fiber layer 9 slightly longer than 0.7 m.

A design feature of this leaf spring 10 may be that the one axial region in which the uppermost fiber layer 9 in the thickening D, the underlying fiber layer 8th covered, at least 5% of the axial extent LD of the thickening D is. If the axial extent LD of the thickening D = 0.45 m is long, then covers the thickness-related last fiber layer 9 the underlying fiber layer 8th over a distance of 0.02 m.

4 shows an axial section of a schematic layout plan for fiber layers for producing a fiber composite leaf spring according to another embodiment. In this case, the leaf spring from two identical leaf spring semi-finished products (Part A, Part B) are made. Such a leaf spring semi-finished product consists of several layered fiber layers. Starting with the later neutral NF fiber of the leaf spring are three fiber layers 5 placed over each other, which extend from one axial end to the other axial end of the leaf spring. There are two fiber layers alternately 6 . 7 . 8th , and 9 different length stored such that alternately a fiber layer forms the one axial end and the other fiber layer of equal length the other axial end of the leaf spring. The distal ends FE2 of the fiber layers 6 . 7 . 8th . 9 do not reach the opposite end of the leaf spring, but they overlap in one middle section of the leaf spring. The fiber layers 6 . 7 . 8th . 9 are always shorter with increasing distance from the neutral fiber NF.

As 4 further clarified, to form the leaf spring according to the invention, two identical leaf spring semi-finished products (Part A and Part B) are assembled with their flat bottom, so that the finished leaf spring on both sides of the neutral fiber NF has a thickening. The compound of the two leaf spring semi-finished products is preferably carried out in a molding press under a controlled pressing pressure and temperature profile.

5 shows a similar schematic layout plan for fiber layers for producing a fiber composite leaf spring according to the invention. However, this is at the top and the bottom of the leaf spring 10 one fiber layer each 11 arranged, which extends to both axial ends of the leaf spring. This ensures a very smooth, stepless surface course.

6 shows a schematic layout plan for fiber layers for producing a fiber composite leaf spring according to another embodiment. It can be clearly seen that the leaf spring has a fiber layer structure which is mirror-symmetrical about the neutral fiber NF. In the manufacture of such a constructed leaf spring are initially two fiber layers 11 filed, which extend completely from one to the other axial end of the leaf spring. Then follow two fiber layers 9 of equal length, alternately one or the other axial end BE1, BE2 of the leaf spring 10 form, but do not reach with their free end to the corresponding other end of the leaf spring. On these fiber layers 9 then become two fiber layers 5 also deposited over the entire length of the leaf spring 10 extend.

Then there will be two fiber layers 12 and 13 stored, which reach neither one nor the other axial end of the leaf spring. Here, the denser to the neutral fiber NF arranged fiber layer 13 longer than the farther fiber layer 12 , On the fiber layers 12 . 13 Then there will be two fiber layers 5 placed over the entire length of the leaf spring 10 extend. On it are fiber layers 8th the same length stored alternately one or the other axial end BE1, BE2 of the leaf spring 10 form, but do not reach with their free end to the corresponding other end of the leaf spring. Nevertheless, these fiber layers 8th recognizable longer than the fiber layers arranged further out 9 , Finally follows a fiber layer 5 extending over the entire length of the leaf spring 10 extends. The further construction of the leaf spring takes place with the fiber layers mentioned, but in opposite order, so that the leaf spring assembly with the two overhead resting, axially connecting both ends of the leaf spring fiber layers 11 is completed.

Finally shows 7 a schematic layout plan for fiber layers for producing a fiber composite leaf spring according to a final embodiment of the invention. Also with this leaf spring are fiber layers 11 used, which is the top or bottom of the finished leaf spring 10 form. Starting from the lower fiber layer 11 then follow two fiber layers 9 , which mutually form the axial end of the leaf spring, but do not reach with its free end the opposite end of the leaf spring. On these fiber layers 9 then become two continuous fiber layers 5 stored. On it are two fiber layers 8th stored, the recognizable longer than the similar fiber layers 9 are, but still serve only for mutual edge formation of the leaf spring and overlap with its free end only the center of the leaf spring. On these fiber layers 8th then become two fiber layers 5 placed over the entire length of the leaf spring 10 extend. Then follow three fiber layers 12 . 13 . 14 , which are arranged so short and such that they do not touch the two axial ends of the leaf spring. It is also recognizable that these fiber layers 12 . 13 . 14 towards the neutral fiber NF of the leaf spring 10 always longer, bit by bit. The conclusion before reaching the neutral fiber NF forms a fiber layer 5 extending over the entire length of the leaf spring 10 extends. Above the neutral fiber NF said fiber layers are stored in reverse order, so that the top of the leaf spring as mentioned by fiber layers 11 is formed, which extends over the entire length of the leaf spring 10 extend.

• a) Zuschneiden von Faserlagen 5, 6, 7, 8, 9 unterschiedlicher Länge,
• b) Ablegen der kürzesten Faserlage 9 in eine Form, wobei ein axiales Ende FE1 dieser Faserlage 9 ein erstes axiales Ende BE1 der Blattfeder 10 bildet, jedoch das zweite axiale Ende BE2 der Blattfeder nicht erreicht,
• c) Ablegen der nächst längeren Faserlage 8 in die Form und auf die vorherige Faserlage 9, wobei ein axiales Ende FE1 dieser weiteren Faserlage 8 das zweite axiale Ende BE2 der Blattfeder bildet aber das erste axiale Ende BE1 der Blattfeder nicht erreicht,
• d) weiter wechselweises Ablegen immer längerer Faserlagen 7, 6 übereinander, bis wenigstens eine Faserlage 5 in die Form abgelegt wird, die sich von einem ersten axialen Ende BE1 bis zu dem zweiten axialen Ende BE2 der Blattfeder 10 erstreckt,
• e) wechselweises Ablegen immer kürzerer Faserlagen 6, 7, 8, 9 übereinander in der Form, wobei diese Faserlagen 6, 7, 8, 9 mit einem ihrer axialen Enden FE1, FE2 das erste axiale Ende BE1 oder das zweite axiale Ende BE2 der Blattfeder 10 bilden, aber das andere axiale Ende BE2; BE1 der Blattfeder nicht erreichen, solange, bis die gewünschte Blattfederdicke D erreicht ist.

For producing a leaf spring 10 according to 3 , which has a symmetrical thickness course around its neutral fiber NF, the following method steps are provided according to a first method:

• a) Cutting fiber layers 5 . 6 . 7 . 8th . 9 different length,
• b) depositing the shortest fiber layer 9 in a mold, wherein an axial end FE1 of this fiber layer 9 a first axial end BE1 of the leaf spring 10 forms, but does not reach the second axial end BE2 of the leaf spring,
• c) depositing the next longer fiber layer 8th in the form and on the previous fiber layer 9 , wherein an axial end FE1 of this further fiber layer 8th but the second axial end BE2 of the leaf spring does not form the first axial end BE1 of the leaf spring,
• d) further alternately depositing ever longer fiber layers 7 . 6 one above the other until at least one fiber layer 5 is deposited in the mold extending from a first axial end BE1 to the second axial end BE2 of the leaf spring 10 extends
• e) alternately depositing ever shorter fiber layers 6 . 7 . 8th . 9 one above the other in the mold, these fiber layers 6 . 7 . 8th . 9 with one of its axial ends FE1, FE2, the first axial end BE1 or the second axial end BE2 of the leaf spring 10 form, but the other axial end BE2; Do not reach BE1 of the leaf spring until the desired leaf spring thickness D is reached.

• f) Zuschneiden von Faserlagen 5, 6, 7, 8, 9 unterschiedlicher Länge,
• g) Ablegen von Faserlagen 5 in eine Form, die sich vom ersten axialen Ende BE1 bis zu dem zweiten axialen Ende BE2 der Blattfeder 10 erstrecken,
• h) wechselweises Ablegen immer kürzerer Faserlagen 6, 7, 8, 9 übereinander in der Form, wobei diese Faserlagen 6, 7, 8, 9 mit einem ihrer axialen Enden FE1 das erste axiale Ende BEI oder das zweite axiale Ende BE2 der Blattfeder 10 bilden, aber das andere axiale Ende BE2, BE1 der Blattfeder nicht erreichen, solange bis die gewünschte Blattfederdicke D erreicht ist.

If a leaf spring or a leaf spring semi-finished product (Part A, Part B) according to 4 is to be produced with a constructive structure, which or has only on one side of a thickening, the following method steps are provided:

• f) cutting fiber layers 5 . 6 . 7 . 8th . 9 different length,
• g) depositing fiber layers 5 in a shape extending from the first axial end BE1 to the second axial end BE2 of the leaf spring 10 extend
• h) alternately depositing ever shorter fiber layers 6 . 7 . 8th . 9 one above the other in the mold, these fiber layers 6 . 7 . 8th . 9 with one of its axial ends FE1, the first axial end BEI or the second axial end BE2 of the leaf spring 10 but do not reach the other axial end BE2, BE1 of the leaf spring until the desired leaf spring thickness D is reached.

Two such leaf spring semi-finished products (Part A, Part B) can be easily put together on their flat sides and to a mirror-symmetrical to their neutral fiber NF leaf spring 10 Harden.

In both variants of the method according to a particular embodiment of the invention a plurality of fiber layers of the same length in the form can be alternately superposed so that these the first axial end BE1 or the second axial end BE2 of the leaf spring 10 form before a next longer or next shorter fiber layer is stored.

In a leaf spring, which after the in 5 is shown in the manufacturing process, the top and bottom of the leaf spring by the storage of at least one fiber layer 11 formed from the first axial end BE1 to the second axial end BE2 of the leaf spring 10 extends.

• i) Zuschneiden von Faserlagen 5, 6, 7, 8, 9, 11, 12, 13, 14 unterschiedlicher Länge,
• j) Ablegen von wenigstens einer Faserlage 11 in einer Form, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt,
• k) darauf Ablegen wenigstens einer Faserlage 6, 7, 8, 9, welche mit ihrem einen axialen Ende BE1 das erste axiale Ende BE1 der Blattfeder 10 bildet und mit ihrem anderen axialen Ende FE2 das zweite axiale Ende BE2 der Blattfeder 10 nicht erreicht,
• l) darauf Ablegen von wenigstens einer Faserlage 5, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt;
• m) darauf Ablegen von wenigstens einer Faserlage 12, 13, welche keines der beiden axialen Enden BE1, BE2 der Blattfeder 10 erreicht, wobei die Länge dieser Faserlagen 12, 13 in Richtung zur neutralen Faser NF immer größer wird,
• n) darauf Ablegen von wenigstens einer Faserlage 5, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt,
• o) darauf Ablegen wenigstens einer Faserlage 6, 7, 8, 9, welche mit ihrem einen axialen Ende FE1 das erste axiale Ende BE1 der Blattfeder 10 bildet und mit ihrem anderen axialen Ende FE2 das zweite axiale Ende BE2 der Blattfeder 10 nicht erreicht,
• p) darauf Ablegen von wenigstens einer Faserlage 5, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt, und
• q) weiter mit den Verfahrensschritten i) bis o) in umgekehrter Reihenfolge, bis die Blattfeder 10 vollständig aufgebaut ist.

One according to the laying plan of 6 manufactured leaf spring 10 is produced according to the following process steps:

• i) cutting fiber layers 5 . 6 . 7 . 8th . 9 . 11 . 12 . 13 . 14 different length,
• j) depositing at least one fiber layer 11 in a shape extending to both ends BE1, BE2 of the leaf spring 10 extends
• k) depositing at least one fiber layer 6 . 7 . 8th . 9 , which with its one axial end BE1, the first axial end BE1 of the leaf spring 10 forms and with its other axial end FE2, the second axial end BE2 of the leaf spring 10 not reached,
• l) depositing at least one fiber layer 5 , which extend to both ends BE1, BE2 of the leaf spring 10 extends;
• m) depositing at least one fiber layer 12 . 13 which does not have any of the two axial ends BE1, BE2 of the leaf spring 10 achieved, with the length of these fiber layers 12 . 13 towards the neutral fiber NF gets bigger,
• n) depositing at least one fiber layer 5 , which extend to both ends BE1, BE2 of the leaf spring 10 extends
• o) depositing at least one fiber layer 6 . 7 . 8th . 9 , Which with its one axial end FE1, the first axial end BE1 of the leaf spring 10 forms and with its other axial end FE2, the second axial end BE2 of the leaf spring 10 not reached,
• p) depositing thereon at least one fiber layer 5 , which extend to both ends BE1, BE2 of the leaf spring 10 extends, and
• q) continue with steps i) to o) in reverse order until the leaf spring 10 is completely built up.

• r) Zuschneiden von Faserlagen 5, 6, 7, 8, 9, 11, 12, 13, 14 unterschiedlicher Länge,
• s) Ablegen von wenigstens einer Faserlage 11 in einer Form, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt,
• t) darauf Ablegen wenigstens einer Faserlage 6, 7, 8, 9, welche mit ihrem einen axialen Ende FE1 das erste axiale Ende BE1 der Blattfeder 10 bildet und mit ihrem anderen axialen Ende FE2 das zweite axiale Ende BE2 der Blattfeder 10 nicht erreicht,
• u) darauf Ablegen von wenigstens einer Faserlage 5, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt,
• v) darauf Ablegen wenigstens einer Faserlage 6, 7, 8, 9, welche mit ihrem einen axialen Ende FE1 das erste axiale Ende BE1 der Blattfeder 10 bildet und mit ihrem anderen axialen Ende FE2 das zweite axiale Ende BE2 der Blattfeder 10 nicht erreicht,
• w) darauf Ablegen von wenigstens einer Faserlage 5, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt,
• x) darauf Ablegen von wenigstens einer Faserlage 12, 13, 14, welche keines der beiden axialen Enden BE1, BE2 der Blattfeder 10 erreicht, wobei die Länge dieser Faserlagen 12, 13, 14 bis zum Erreichen der neutralen Faser NF immer größer wird,
• y) darauf Ablegen von wenigstens einer Faserlage 5, welche sich bis zu beiden Enden BE1, BE2 der Blattfeder 10 erstreckt, und
• z) weiter mit den Verfahrensschritten r) bis x) in umgekehrter Reihenfolge, bis die Blattfeder 10 vollständig aufgebaut ist.

One according to the laying plan of 7 manufactured leaf spring 10 is produced according to the following process steps:

• r) cutting fiber layers 5 . 6 . 7 . 8th . 9 . 11 . 12 . 13 . 14 different length,
• s) depositing at least one fiber layer 11 in a shape extending to both ends BE1, BE2 of the leaf spring 10 extends
• t) depositing at least one fiber layer 6 . 7 . 8th . 9 , Which with its one axial end FE1, the first axial end BE1 of the leaf spring 10 forms and with its other axial end FE2, the second axial end BE2 of the leaf spring 10 not reached,
• u) depositing at least one fiber layer 5 , which extend to both ends BE1, BE2 of the leaf spring 10 extends
• v) depositing at least one fiber layer 6 . 7 . 8th . 9 , Which with its one axial end FE1, the first axial end BE1 of the leaf spring 10 forms and with its other axial end FE2, the second axial end BE2 of the leaf spring 10 not reached,
• w) depositing thereon at least one fiber layer 5 , which extend to both ends BE1, BE2 of the leaf spring 10 extends
• x) depositing at least one fiber layer 12 . 13 . 14 which does not have any of the two axial ends BE1, BE2 of the leaf spring 10 achieved, with the length of these fiber layers 12 . 13 . 14 until reaching the neutral fiber NF becomes larger,
• y) depositing thereon at least one fiber layer 5 , which extend to both ends BE1, BE2 of the leaf spring 10 extends, and
• z) continue with steps r) to x) in reverse order until the leaf spring 10 is completely built up.

As 6 and 7 show are the fiber layers used in these constructions 8th . 9 , which only one axial end BE1 or BE2 of the leaf spring forming towards the neutral fiber NF longer and longer.

Further, in the manufacture of such a leaf spring is provided that the fiber layers are crosslinked before or after their trimming with a synthetic resin, and that the leaf spring 10 is pressed and set in the form mentioned under the action of a predetermined temporal temperature and pressure curve.

The advantages that the structural design of the fiber composite leaf spring produced according to the invention are also achievable if the individual fiber layers are not stored in a form alternately one above the other, but this is done directly on a flat or curved surface. A subsequent or delayed with the transfer of this raw leaf spring in a molding press then allows their setting and curing.

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 1231967 A1 [0002]
• EP 0225485 B1 [0002]
• US 3,900,357 B1 [0002]
• JP 61-149631 A1 [0002]

Claims (25)

Leaf spring ( 10 ) of a fiber composite material, consisting of a plurality of wetted with a synthetic resin fiber layers, wherein different lengths of fiber layers are arranged one above the other, characterized in that different lengths of fiber layers ( 6 . 7 . 8th . 9 ) are alternately arranged one above the other in such a way that with their one axial end (FE1) they engage the first axial end (BE1, BE2) of the leaf spring (FIG. 10 ) and with its other axial end (FE2), the second axial end (BE2, BE1) of the leaf spring ( 10 ) do not reach. Leaf spring according to claim 1, characterized in that the different length fiber layers ( 6 . 7 . 8th . 9 ) with its other, not not flush axial end (FE2), the axial center of a thickening (D) of the leaf spring ( 10 axially overlap, without the opposite second axial end (BE2) of the leaf spring ( 10 ) to reach. Leaf spring according to claim 1 or 2, characterized in that the differently long fiber layers ( 6 . 7 . 8th ) are arranged one above the other in such a way that starting from the neutral fiber (FN) of the leaf spring (FN) 10 ) with increasing thickness (D) of the same shorter and shorter fiber layers ( 6 . 7 . 8th ) alternately on top of each other. Leaf spring according to one of claims 1 to 3, characterized in that at least one fiber layer ( 6 ) with a certain length (L2) at one axial end (BE1) of the leaf spring ( 10 ) is flush, and that over this fiber layer ( 6 ) at least one further fiber layer ( 6 ) with the same length (L2) at the other end (BE2) of the leaf spring ( 10 ) is flush. Leaf spring according to one of claims 1 to 3, characterized in that at least one fiber layer ( 6 ) with a certain length (L2) at one axial end (BE1) of the leaf spring ( 10 ) is flush, and that over this fiber layer ( 6 ) at least one other fiber layer ( 7 ) with a different length (L5) at the other end (BE2) of the leaf spring ( 10 ) is flush. Leaf spring according to one of the preceding claims, characterized in that in addition fiber layers ( 5 ) in the leaf spring ( 10 ) which extend from the first axial end (BE1) to the second axial end (BE2) of the leaf spring (BE1). 10 ). Leaf spring according to one of the preceding claims, characterized in that in addition fiber layers ( 12 . 13 . 14 ) in the leaf spring ( 10 ) are arranged, which none of the two axial ends (BE1, BE2) of the leaf spring ( 10 ) to reach. Leaf spring according to one of the preceding claims, characterized in that in the region of the neutral fiber (NF) of the leaf spring ( 10 ) Fiber layers ( 5 ) are arranged, which at both ends (BE1, BE2) of the leaf spring ( 10 ). Leaf spring according to one of the preceding claims, characterized in that the axial region of the leaf spring ( 10 ), in which its uppermost fiber layer ( 8th ) in the thickening (D) the underlying fiber layer ( 7 ), at least 5% of the axial extent (LD) of the thickening (D) is. Leaf spring according to one of the preceding claims, characterized in that each fiber layer ( 5 . 6 . 7 . 8th . 9 . 11 . 12 . 13 . 14 ) has a plurality of superimposed and juxtaposed individual fibers. Leaf spring according to one of the preceding claims, characterized in that the fiber layers ( 5 . 6 . 7 . 8th . 9 . 11 . 12 . 13 . 14 ) consist of fiber strands or fiber fabrics. Leaf spring according to one of the preceding claims, characterized in that the thickening (D) in the region of the center of the leaf spring ( 10 ), in its end-side chucking area or formed therebetween. Leaf spring according to one of the preceding claims, characterized in that in each case at least one fiber layer ( 11 ) at the top and at the bottom of the leaf spring ( 10 ) is arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ). Leaf spring according to one of the preceding claims, characterized in that the different lengths of fiber layers ( 6 . 7 . 8th . 9 ), which with its one axial end (FE1) the first axial end (BE1, BE2) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2, BE1) of the leaf spring ( 10 ), and those fiber layers ( 5 ), which extend to both ends (BE1, BE2) of the leaf spring ( 10 ), as well as those fiber layers ( 12 . 13 . 14 ), which none of the two axial ends (BE1, BE2) of the leaf spring ( 10 ), to form the leaf spring ( 10 ) are alternately stacked. Leaf spring according to one of the preceding claims, characterized in that starting from the neutral fiber (NF) of the leaf spring ( 10 ) first such fiber layers ( 5 ) are arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ) extend that with increasing thickness symmetrically to the neutral fiber (NF) several such different length fiber layers ( 6 . 7 . 8th . 9 ) are arranged, which with its one axial end (FE1), the first axial end (BE1, BE2) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2, BE1) of the leaf spring ( 10 ), that then again such fiber layers ( 5 ) are arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ) extend that then fiber layers ( 12 . 13 . 14 ) in the leaf spring ( 10 ) are arranged, which none of the two axial ends (BE1, BE2) of the leaf spring ( 10 ) that subsequently such fiber layers ( 5 ) are arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ) extend that then several such different length fiber layers ( 6 . 7 . 8th . 9 ) are arranged, which with its one axial end (FE1), the first axial end (BE1, BE2) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2, BE1) of the leaf spring ( 10 ), and then in each case at least one fiber layer ( 11 ) at the top and at the bottom of the leaf spring ( 10 ) is arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ). Leaf spring according to one of the preceding claims, characterized in that starting from the neutral fiber (NF) of the leaf spring ( 10 ) first such fiber layers ( 5 ) are arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ) extend that with increasing thickness symmetrically to the neutral fiber (NF) several such different length fiber layers ( 12 . 13 . 14 ) in the leaf spring ( 10 ) are arranged, which none of the two axial ends (BE1, BE2) of the leaf spring ( 10 ) that subsequently at least one such fiber layer ( 5 ) is arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ) extends, that then several such different lengths of fiber layers ( 6 . 7 . 8th . 9 ) are arranged, which with its one axial end (FE1), the first axial end (BE1, BE2) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2, BE1) of the leaf spring ( 10 ), that subsequently such fiber layers ( 5 ) are arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ) extend that then several such different length fiber layers ( 6 . 7 . 8th . 9 ) are arranged, which with its one axial end (FE1), the first axial end (BE1, BE2) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2, BE1) of the leaf spring ( 10 ), and then in each case at least one fiber layer ( 11 ) at the top and at the bottom of the leaf spring ( 10 ) is arranged, which up to both ends (BE1, BE2) of the leaf spring ( 10 ). Method for producing a leaf spring ( 10 ) of a fiber composite material according to one of claims 1 to 16, characterized by the following method steps: a) cutting fiber layers ( 5 . 6 . 7 . 8th . 9 ) of different lengths, b) depositing the shortest fiber layer ( 9 ) in a mold, wherein an axial end (FE1) of this fiber layer ( 9 ) a first axial end (BE1) of the leaf spring ( 10 ), but the second axial end (BE2) of the leaf spring is not reached, c) depositing the next longer fiber layer (FIG. 8th ) in the form and on the previous fiber layer ( 9 ), wherein an axial end (FE1) of this further fiber layer ( 8th ) forms the second axial end (BE2) of the leaf spring, but does not reach the first axial end (BE1) of the leaf spring, d) further alternately depositing ever longer of these fiber layers (BE2) 7 . 6 ) over one another until at least one fiber layer ( 5 ) is deposited in the mold extending from a first axial end (BE1) to the second axial end (BE2) of the leaf spring (BE1) 10 ), e) alternately depositing ever shorter fiber layers ( 6 . 7 . 8th . 9 ) one above the other in the mold, these fiber layers ( 6 . 7 . 8th . 9 ) with one of its axial ends (FE1, FE2) the first axial end (BE1) or the second axial end (BE2) of the leaf spring ( 10 ), but do not reach the other axial end (BE2; BE1) of the leaf spring until the desired leaf spring thickness (D) is reached. Method for producing a leaf spring from a fiber composite material according to one of Claims 1 to 16, characterized by the following method steps: f) Cutting fiber layers ( 5 . 6 . 7 . 8th . 9 ) of different lengths, g) depositing fiber layers ( 5 ) in a shape extending from the first axial end (BE1) to the second axial end (BE2) of the leaf spring (BE1) 10 h) alternately depositing ever shorter fiber layers ( 6 . 7 . 8th . 9 ) one above the other in the mold, these fiber layers ( 6 . 7 . 8th . 9 ) with one of its axial ends (FE1) the first axial end (BE1) or the second axial end (BE2) of the leaf spring ( 10 ), but do not reach the other axial end (BE2, BE1) of the leaf spring until the desired leaf spring thickness (D) is reached. Method for producing a leaf spring ( 10 ) of a fiber composite material according to one of claims 1 to 16, characterized by the following method steps: i) cutting fiber layers ( 5 . 6 . 7 . 8th . 9 . 11 . 12 . 13 . 14 ) of different lengths, j) depositing at least one fiber layer ( 11 ) in a shape which extends to both ends (BE1, BE2) of the leaf spring ( 10 k) depositing at least one fiber layer ( 6 . 7 . 8th . 9 ), which with its one axial end (FE1), the first axial end (BE1) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2) of the leaf spring ( 10 ) not reached, l) depositing at least one fiber layer ( 5 ), which extend to both ends (BE1, BE2) of the leaf spring ( 10 m) depositing thereon at least one fiber layer ( 12 . 13 ), which none of the two axial ends (BE1, BE2) of the leaf spring ( 10 ), the length of these fiber layers ( 12 . 13 ) becomes ever larger towards the neutral fiber (NF), n) depositing at least one fiber layer ( 5 ), which extend to both ends (BE1, BE2) of the leaf spring ( 10 ), o) depositing at least one fiber layer ( 6 . 7 . 8th . 9 ), which with its one axial end (FE1), the first axial end (BE1) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2) of the leaf spring ( 10 ) is not reached, p) depositing at least one fiber layer ( 5 ), which extend to both ends (BE1, BE2) of the leaf spring ( 10 ), and q) continue with the steps i) to o) in reverse order until the leaf spring ( 10 ) is completely constructed. Method for producing a leaf spring ( 10 ) of a fiber composite material according to one of claims 1 to 16, characterized by the following method steps: r) cutting fiber layers ( 5 . 6 . 7 . 8th . 9 . 11 . 12 . 13 . 14 ) of different lengths, s) depositing at least one fiber layer ( 11 ) in a shape which extends to both ends (BE1, BE2) of the leaf spring ( 10 t) depositing at least one fiber layer ( 6 . 7 . 8th . 9 ), which with its one axial end (FE1), the first axial end (BE1) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2) of the leaf spring ( 10 ) is not reached, u) depositing at least one fiber layer ( 5 ), which extend to both ends (BE1, BE2) of the leaf spring ( 10 v) depositing at least one fiber layer ( 6 . 7 . 8th . 9 ), which with its one axial end (FE1), the first axial end (BE1) of the leaf spring ( 10 ) and with its other axial end (FE2), the second axial end (BE2) of the leaf spring ( 10 ), w) depositing at least one fiber layer ( 5 ), which extend to both ends (BE1, BE2) of the leaf spring ( 10 x) depositing at least one fiber layer ( 12 . 13 . 14 ), which neither of the two axial ends (BEI, BE2) of the leaf spring ( 10 ), the length of these fiber layers ( 12 . 13 . 14 ) becomes ever larger until reaching the neutral fiber (NF), y) depositing at least one fiber layer ( 5 ), which extend to both ends (BE1, BE2) of the leaf spring ( 10 ), and z) continue with the process steps r) to x) in reverse order until the leaf spring ( 10 ) is completely constructed. Method according to one of claims 17 to 20, characterized in that the leaf spring ( 10 ) is assembled from two leaf spring semi-finished products (Part A, Part B), which are produced starting from the neutral fiber (NF) according to some of method steps a) to z), and in which these leaf spring semi-finished products (Part A, Part B ) after their production to form the leaf spring ( 10 ) are connected to each other on their plan page. Method according to one of claims 17 to 21, characterized in that several fiber layers of the same length in the form are alternately superimposed, such that these the first axial end (BE1) or the second axial end (BE2) of the leaf spring ( 10 ) form, before a next longer or next shorter fiber layer is stored. Method according to one of claims 17 to 22, characterized in that the top and / or the underside of the leaf spring ( 10 ) by the deposition of at least one fiber layer ( 11 ) extending from the first axial end (BE1) to the second axial end (BE2) of the leaf spring (BE1) 10 ). Method according to one of claims 17 to 23, characterized in that the fiber layers are crosslinked before or after their cutting with a synthetic resin, and that the leaf spring ( 10 ) is pressed and set in the mold under the action of a predetermined temporal temperature and pressure curve. Method according to one of claims 17 to 24, characterized in that for the production of the leaf spring ( 10 ) the fiber layers ( 6 . 7 . 8th . 9 . 11 . 12 . 13 . 14 ) forming prepregs are used.

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