KR20190039298A

KR20190039298A - A method for manufacturing a leaf spring made of a fiber composite material having an insert, and a method for manufacturing a leaf spring and an automobile chassis

Info

Publication number: KR20190039298A
Application number: KR1020197007998A
Authority: KR
Inventors: 슈테판 크란; 토마스 루플린; 마티아스 슈람; 카사노바 이그나치오 로보
Original assignee: 젯트에프 프리드리히스하펜 아게
Priority date: 2016-08-25
Filing date: 2017-07-24
Publication date: 2019-04-10
Also published as: EP3504458A1; DE102016215938A1; CN109642630A; WO2018036733A1; JP2019528408A; DE102016215938B4

Abstract

The invention relates to a method for producing a leaf spring (1) formed of a fiber composite material, wherein the leaf spring (1) comprises one or more non-raised portions (2) lying between the ends , &Lt; / RTI > 3). In order to reduce the manufacturing cost, one or more non-banks 2, 3 are each defined by one or more inserts 8, And between the upper cover layer 6 and the lower cover layer 7 in the region of FIG.

Description

A method for manufacturing a leaf spring made of a fiber composite material having an insert, and a method for manufacturing a leaf spring and an automobile chassis

The present invention relates to a method for manufacturing a leaf spring made of a fiber composite material, wherein the leaf spring is made of a plurality of fiber layers having at least one overhang lying between the ends in the longitudinal direction. The present invention also relates to a leaf spring and an automobile chassis.

In a chassis of an automobile, a leaf spring for resiliently supporting the vehicle body against the wheels provided in the wheel carrier can be used as a suspension spring. One important advantage of the leaf spring in this case is that the leaf spring can serve as a structural element for connecting the vehicle body and the shaft, as well as a wheel guide function, as compared to other types of spring structures. If more leaf springs are used at this time, further predetermined damping can be achieved due to the frictional force between the individual spring plates, so that the leaf spring can support the function of the vibration damper.

By gradually increasing the cases in which the leaf springs are made of a fiber composite material, the above-mentioned advantages can be realized at the same time with advantages of low weight. To this end, the leaf springs are usually composed of a plurality of fiber layers which are arranged mutually according to a desired shape of the leaf spring, are compressed, and are then connected to each other in a material coupling manner via a plastic matrix. This allows different properties of the leaf spring to be realized, depending on the geometry and material selection of the finally formed leaf spring.

In a method for manufacturing a leaf spring made of a fiber composite material disclosed in DE 10 2010 050 065 B4, a leaf spring is made of a plurality of fiber layers. In this case, between the ends of the leaf spring, a thicker portion having a greater thickness than the rest of the leaf spring is formed, wherein the fibrous layers with different lengths alternate from the ends to the desired area It is created by extending and overlapping here. This intentional overlap of the fibrous layers in the desired region causes later formation of hypertrophy there.

On the basis of the above prior art, the object of the present invention is to provide a method for producing a leaf spring made of a fiber composite material, in which case it is possible to manufacture one or more non-drawn parts with low manufacturing costs.

Starting from the premise of claim 1, the above problem is solved together with the features of the features of this claim. The dependent claims subsequent to claim 1 each reproduce the preferred improvements of the invention. Further, the leaf spring according to the present invention is the object of claim 9, and the chassis having the leaf spring is claimed in claim 10.

According to the present invention, in a method for manufacturing a leaf spring made of a fiber composite, a leaf spring is made of a plurality of fiber layers having at least one overhang that lies between the ends in the longitudinal direction. In other words, according to the present invention, leaf springs are made of a plurality of individual fiber layers that combine with plastic to form a fiber / plastic composite. In this case, the fibers in the sense of the present invention are reinforcing fibers in the form of glass fibers, in particular surrounded by a plastic matrix. At this time, the plastic matrix is preferably formed by a thermosetting plastic that may be present in the form of an epoxy resin.

At this time, in the case of the leaf spring to be manufactured, at least one non-large portion is formed between the ends during the manufacturing process. Here, "non-parting" means a section of a leaf spring implemented to be much thicker than other sections of the leaf spring, i.e., having a larger extension in the direction of compression. In this case, one or a plurality of regions thickened as described above may be provided along the length extension portion of the leaf spring, and these regions may be formed corresponding to each other or different from each other in thickness.

Now, the present invention is directed to a method of manufacturing a semiconductor device, wherein the at least one overhang is each defined by one or more inserts, As shown in FIG. In other words, in the method according to the invention, one or more inserts are prefabricated in a preceding process, in which case the preformed insert has, in another production process of the original leaf spring, Is disposed between the cover layers and defines the required overhang there after being connected to the cover layer.

In this case, the design of the above method has the advantage that the manufacturing cost can be reduced by the pre-manufacture of one or more inserts. The reason for this is that the original leaf spring is thereby divided into a plurality of components that are joined together at the end of the manufacturing process. This allows the positioning and connection of the individual fiber layers in the insert to be performed more simply than when the individual fiber layers are arranged up and down in the process of forming the final leaf springs. Another advantage is that there is a wide variety of possible combinations of pre-fabricated embodiments of inserts having different cover layers, whereby the different properties of the leaf spring may be implemented so that the manufacture of the leaf spring can be modularly formed It is. In this case, different preformed inserts may be combined together. Overall, one or a plurality of prefabricated inserts are disposed at the individual point (s) between the cover layers, thereby realizing one or a plurality of large regions, so that the manufacture of the leaf springs can be simplified.

Alternatively, in the case of DE 10 2010 050 065 B4, the individual extensions of the leaf springs to be produced are formed by the corresponding overlapping of the fiber layers, these fiber layers being alternately corresponding to the axial ends of the leaf springs As shown in FIG. Such a process is correspondingly complicated because the fabrics have to be stacked up and the slip of the individual layers must be suppressed before final bonding.

The expression " preformed as a unit "in the context of the present invention means that the insert has been pre-fabricated as a fiber / plastic composite during previous manufacturing processes. In this case, preferably the individual fiber layers of the insert are pre-compressed in a furnace process and incorporated into the plastic matrix.

In principle, the insert may be made of the same fiber composite material as the cover layer, or may be made of a different material, depending on the properties to be achieved of the final leaf spring. Likewise, the cover layer may be made of one and the same material, or may be formed of different materials.

In accordance with one embodiment of the present invention, the one or more inserts are comprised of a plurality of fiber layers in a preceding process, which are connected to one another in a nested state in one or more sections, The thickness is specified. In this case, in the improvement of this embodiment, the fiber layers of different lengths are connected to each other. In other words, the one or more inserts consist of different fiber layers corresponding to the previously defined pattern, in which case the thickness to be achieved is realized by the intentional overlap of the different fiber layers.

According to an alternative or complementary embodiment of the invention, the one or more inserts consist of a plurality of fiber layers in a preceding process, in which case one or more of the shorter fiber layers are made up of one or more longer fiber layers Thereby forming at least one section having a larger thickness. In other words, in this case, the desired thickness of the one or more inserts is realized by placing one or a plurality of shorter fiber layers on one or more longer fiber layers. That is, the fibers are stacked up and down.

According to another embodiment of the present invention, the upper cover layer and / or the lower cover layer are each formed by a plurality of fiber layers. That is, according to the present invention, not only the upper cover layer, the lower cover layer, or the upper cover layer but also the lower cover layer are each composed of a plurality of fiber layers. As a result, depending on the choice of the number of fiber layers, the properties of the leaf spring to be finally produced may be affected. In this case, in the scope of the present invention, it is also conceivable to preliminarily manufacture the upper cover layer or the lower cover layer in the category of the preceding process. Or alternatively, the individual fiber layers may be combined with one or more intermediate intervening inserts within the scope of the connection.

In the improvement example of the above-described embodiment, the plurality of fiber layers each have the same length. In this case, particularly preferably, the fiber layers of the upper cover layer and / or the lower cover layer extend from the axial end of the final leaf spring to the other end in the longitudinal direction of the leaf spring.

Another preferred embodiment of the present invention is one in which at least one large portion is formed by a plurality of interposing inserts. That is, the individual overhangs are formed by cooperation of a plurality of inserts, wherein the inserts are more preferably arranged mirror-symmetrically so as to be interrelated between the upper and lower cover layers. Through such cooperation, a much thicker hyperbole can be realized by the insert embodied as the same parts.

The leaf spring produced by the method according to the invention is characterized in that at least one non-raised portion is formed between the end portions in the longitudinal direction, in this case, between the upper cover layer and the lower cover layer One or more inserts are provided, which are connected to the cover layer as a pre-fabricated unit. Such plate spring is particularly a part of an automobile chassis, and the plate spring used in this case can be continuously manufactured in accordance with the other modifications described above.

The invention is not limited to the explicit combinations of the features of the independent claims or of the claims dependent on these independent claims. Furthermore, there is also the possibility that the individual features may be combined with one another as long as the individual features are evident from the claims, the following detailed description of the preferred embodiments of the invention, or from each of the figures. The use of reference numerals in the claims in conjunction with the drawings is not intended to limit the scope of the claims.

Preferred embodiments of the present invention described below are shown in the respective figures.

1 is a schematic view of a leaf spring according to the present invention, corresponding to a first embodiment of the present invention, shown in a completed state;
Figure 2 is a schematic view of the leaf spring of Figure 1, exploded in its own components;
Figure 3 is a schematic, single view of the insert of Figure 2, in its pre-finished state.
Figure 4 is a schematic, single view of the insert in its finished state.
Figure 5 is a schematic, single view of the top cover layer of Figure 2, shown before completion.
Figure 6 is a schematic, single view of the lower cover layer of Figure 2, shown before completion.
Fig. 7 is a schematic view of a leaf spring corresponding to the second embodiment of the present invention, which is shown before completion. Fig.
Fig. 8 is a schematic view of a leaf spring corresponding to the third embodiment of the present invention, which is shown before completion. Fig.

1, a schematic view of a leaf spring 1 formed in accordance with a first embodiment of the present invention is disclosed. As can be seen in Figure 1, the leaf spring 1 has two non-raised portions 2 and 3 spaced apart from one another between the ends 4 and 5 in the longitudinal direction. In this case, the plate spring 1 in the region of the non-boss portions 2 and 3 is implemented with a much larger thickness than the end side portion and the central region interposed therebetween. In this case, FIG. 1 shows the leaf spring 1 in a finished state, in which a plurality of fiber layers, in particular in the form of glass fibers, are surrounded by a plastic matrix and form a fiber / plastic composite. At this time, the plastic is particularly formed by thermosetting plastic, and preferably exists as an epoxy resin.

As a special feature, the leaf spring 1 is constructed in the form of a configuration kit with a plurality of prefabricated components visible in Fig. It can now be seen in figure 2 that the leaf spring 1 is formed by one upper cover layer 6, one lower cover layer 7 and a total of four inserts 8, And are disposed between the upper cover layer 6 and the lower cover layer 7, respectively. More specifically, in this case, the insert 8 is located at a point between the upper cover layer 6 and the lower cover layer 7, where the later leaf spring 1 has the non-banks 2 and 3, respectively And are mirror-symmetrically placed in pairs.

The cover layers 6 and 7 and the inserts 8 are also pre-fabricated from a plurality of fiber layers in the preceding process steps, respectively, which is shown with respect to the insert 8 of FIGS. 3 and 4, FIG. 6 shows the pre-fabricated state of the lower cover layer 7; FIG. In connection with the insert 8, it can be seen in Fig. 3 that a plurality of fiber layers 9-13 having different lengths are arranged in a stacked-up manner. In this case, the fibrous layers 10 to 13 are formed so that the fibrous layer 10 overlaps with the upper and lower fibrous layers 11 and 12 in the form of layers and is superimposed by the uppermost fibrous layer 13 again, Is arranged on the longest fiber layer (9). This results in the desired contour of the insert 8 being formed, in which case the fibrous layers 9-13 are finally formed into a wedge-shaped contour as shown in Fig. 4 in a subsequent furnace process so as to be surrounded by a plastic matrix Precompressed.

5 and 6, the upper cover layer 6 as well as the lower cover layer 7 are each formed of a plurality of fiber layers 14 of equal length. In this case, the fiber layer 14 has a length corresponding to the length defined by the later leaf spring 1 between the ends 4 and 5, respectively. 5 and 6, the upper cover layer 6 is composed of two fiber layers 14 while the lower cover layer 7 is formed by a total of four fiber layers 14, do. The upper cover layer 6 as well as the lower cover layer 7 are similarly pre-compressed and bonded in the plastic matrix. In the last step, the final leaf spring 1 is fabricated from the top cover layer 6, the intervening four inserts 8 and the bottom cover layer 7.

7, the components of the leaf spring 15 corresponding to the second embodiment of the present invention are shown. Unlike the previous variant, this embodiment is implemented identically, in such a way that the top cover layer 16 and the bottom cover layer 17 are composed of the same number of fiber layers, in this case each of four fiber layers . This applies equally to the components of the leaf spring 18 shown in Fig. 8 in which the upper cover layer 19 and the lower cover layer 20 have the same structure, i.e. implemented as corresponding components do. However, unlike in the preceding variant, the upper cover layer 19 and the lower cover layer 20 are formed by two fiber layers, respectively.

By means of the method according to the invention, the leaf springs can be manufactured with low manufacturing costs, while at the same time different thickness profiles can be realized without problems.

1: leaf spring
2: Non-loan
3: Non-loan
4: end
5: End
6: upper cover layer
7: Lower cover layer
8: insert
9: fiber layer
10: fiber layer
11: fiber layer
12: fiber layer
13: fiber layer
14: fiber layer
15: leaf spring
16: upper cover layer
17: Lower cover layer
18: leaf spring
19: upper cover layer
20: Lower cover layer

Claims

Wherein the leaf spring (1; 15; 18) is made of a plurality of fiber layers (9-14) having at least one non-boss (2, 3) lying between the ends (4, 5) A method for manufacturing a leaf spring (1; 15; 18) formed of a material,
One or more non-bosses 2, 3 are each defined by one or more inserts 8 which are pre-manufactured as a unit and which are to be respectively defined in the region of the non-bosses 2, 6, 16; 19) and the lower cover layer (7; 17; 20).

2. A method according to claim 1, characterized in that one or more inserts (8) consist of a plurality of fiber layers (10-13) in a preceding process, the fiber layers being connected to each other in a superimposed manner in one or more sections, Wherein the thickness of the fiber-reinforced composite material is greater than the thickness of the fiber-reinforced composite material.

3. A method according to claim 2, characterized in that fiber layers (11-13) of different lengths are connected to each other.

The method according to claim 1, wherein one or more inserts (8) are comprised of a plurality of fiber layers (9-13) in a preceding process and one or more shorter fiber layers (10-13) ) So that at least one section having a greater thickness is formed.

A fiber composite material according to claim 1, characterized in that the upper cover layer (6; 16; 19) and / or the lower cover layer (7; 17; 20) are each formed by a plurality of fiber layers (14) .

6. A fiber composite material according to claim 5, characterized in that the plurality of fiber layers (14) of the upper cover layer (6; 16; 19) or the lower cover layer (7; 17; 20) Method of manufacturing plate spring.

A method according to claim 1, characterized in that at least one non-boss (2, 3) is formed by a plurality of interposing inserts (8) interposed in between.

8. A method according to claim 7, characterized in that the corresponding inserts (8) are mirror-symmetrically arranged with respect to one another.

A leaf spring (1; 15; 18) made of a fiber composite material, wherein one or more non-boss portions (2, 3) are formed between the end portions (4, 5)
One or more inserts (8) are provided between the top cover layer (6; 16; 19) and the bottom cover layer (7; 17; 20) within the respective region of the at least one non- Wherein the inserts (8) are connected to the cover layers (6, 7; 16, 17; 19, 20) as a prefabricated unit.

An automotive chassis comprising a leaf spring according to claim 9.