Carbon fiber reinforced component for connection with a metallic connecting element

Abstract

The invention relates to a carbon fiber reinforced component for connection with a metallic connecting element, comprising a through-opening (7) for receiving the metallic connecting element (11). In the case of a carbon fiber reinforced component, corrosion with functional failure of metallic components in contact with the carbon fiber reinforced component is a To prevent this, the component (1) consists of several superimposed carbon fiber reinforced layers (3), wherein between each two directly superimposed carbon fiber reinforced layers (3) a glass fiber reinforced layer (5) is arranged partially in the area of ​​the through-opening (7), completely enclosing it, which projects beyond the carbon fiber reinforced layers (3) in the direction of the through-opening (7) and projects radially into the through-opening (7).

Description

[0001] The invention relates to a carbon fiber reinforced component for connection to a metallic connecting element, comprising a through-opening for receiving the metallic connecting element, and to a vehicle.

[0002] As part of lightweight construction efforts, carbon fiber-reinforced composite materials, which are characterized by high electrical conductivity, are used in motor vehicles. To attach a carbon fiber-reinforced component to the vehicle, a force application point is required. Metallic components with a metric thread are used for this purpose. Contact between metals and exposed carbon fibers in a wet area leads to severe contact corrosion of the metals, making it necessary to insulate the metal from the carbon fiber-reinforced component.

[0003] DE 10 2012 001 859 A1 discloses a connection assembly consisting of a component made of a carbon fiber-reinforced composite material and a screw. To protect against electrochemical contact corrosion, a horizontally extending partition made of a titanium alloy or an electrically non-conductive ceramic material is arranged between the component and the screw.

[0004] DE 10 2013 005 881 A1 discloses a screw connection between a metallic component and a carbon fiber-reinforced component, in which the components are connected to each other by means of a screw passing through respective through-holes in the components. The screw is surrounded by a cylindrical plastic sleeve in the area of ​​the through-hole in the carbon fiber-reinforced component.

[0005] DE 11 2020 002 412 T5 describes methods for manufacturing a hybrid composite component, the method comprising nesting one or more metal mesh layers with two or more nested layers of a first fiber-reinforced composite material (FRCM); and providing one or more abutting layers of a second FRCM in a position abutting the second edge of the one or more metal mesh layers, wherein the one or more abutting layers of the second FRCM are nested with the second portion of the two or more nested layers of the first FRCM.

[0006] The object of the invention is to provide a carbon fiber reinforced component for connection to a metallic connecting element, which prevents corrosion with functional failure of metallic components in contact with the carbon fiber reinforced component.

[0007] The invention is based on the features of the independent claims. Advantageous developments and refinements are the subject of the dependent claims. Further features, possible applications, and advantages of the invention will become apparent from the following description and the explanation of exemplary embodiments of the invention illustrated in the figures.

[0008] The problem is solved by the subject matter of patent claim 1 or 4.

[0009] In the carbon fiber-reinforced component described above for connection to a metallic connecting element, comprising a through-hole for receiving the metallic connecting element, the component consists of several superimposed carbon fiber-reinforced layers. Between each two directly superimposed carbon fiber-reinforced layers, a glass fiber-reinforced layer is arranged partially in the area of ​​the through-hole, completely enclosing it. This glass fiber-reinforced layer projects beyond the carbon fiber-reinforced layers in the direction of the through-hole and extends radially into the through-hole. Carbon fiber-reinforced or glass fiber-reinforced layers are understood to mean, in particular, carbon fiber-reinforced plastics (CFRP) and glass fiber-reinforced plastics (GFRP).The area surrounding the metal connecting element that extends into the through-hole is comprised of only electrically insulating glass fibers, polymer, and, if applicable, adhesive from the glass fiber-reinforced layers. The metal connecting element is thus insulated from the carbon fibers of the carbon fiber-reinforced layers, even though carbon fibers of the carbon fiber-reinforced layers are exposed at the through-hole. This eliminates maintenance costs when installed in a single unit. Functional failure due to contact corrosion is thus reliably prevented.

[0010] The glass fiber reinforced layer is integrated into at least one of the directly superimposed carbon fiber reinforced layers and forms a transition area from which the glass fiber reinforced layer protrudes radially into the through-hole. The integration of the glass fiber reinforced layer into the carbon fiber reinforced layer creates a reliable, solid connection between the two layers, ensuring that only the glass fibers protruding from the glass fiber reinforced layer can come into contact with the metallic connecting element.

[0011] It is also possible for the GRP layer and the CFRP layer to be fanned out into multiple plies or layers in the transition area between the GRP and CFRP, with each GRP layer or layer being integrated into corresponding CFRP layers or layers. In the transition area, there is essentially a sandwich structure made up of multiple CFRP and GRP layers or layers.

[0012] In one embodiment, the glass-fiber-reinforced layers exhibit an angular offset in their fiber orientation. This allows a particularly stable plastic structure to be created in a simple lamination process.

[0013] In one variant, the glass-fiber-reinforced layer surrounding the through-hole is designed as a round or rectangular plate. By inserting round or rectangular glass-fiber-reinforced plates between the carbon-reinforced layers, the stability of the resulting structure can be influenced and adapted to the specific application.

[0014] In one embodiment according to the invention, a moisture drainage hole is formed within the glass fiber-reinforced layer between the transition region and the through-hole. Since splash water can accumulate on the carbon fiber-reinforced layer, the moisture drainage hole serves to divert it away from the metallic composite element. This provides additional corrosion protection.

[0015] A further aspect of the invention relates to a vehicle in which a metallic body component is mechanically connected to a carbon-fiber-reinforced component by means of a metallic connecting element. The body component and the carbon-fiber-reinforced component have superimposed through-holes into which the metallic connecting element is inserted in a force-fitting and / or material-fitting manner. The carbon-fiber-reinforced component is designed according to at least one of the features described in this patent application. By preventing contact corrosion in areas of the vehicle exposed to the weather, particularly those at risk from splashing water, cost-effective metallic materials can be used.

[0016] It is advantageous if the metallic body component is made of steel or aluminum and the component to be connected to the vehicle body has glass fiber reinforcement and carbon fiber reinforcement.

[0017] In a further embodiment, the metal body component is designed as a cross member of the vehicle's front end and the carbon fiber reinforced component is designed as a spoiler of the vehicle.

[0018] Further advantages, features, and details will become apparent from the following description, in which at least one exemplary embodiment is described in detail—possibly with reference to the drawings. Described and / or illustrated features may form the subject matter of the invention alone or in any meaningful combination, possibly independently of the claims, and may, in particular, also be the subject of one or more separate applications. Identical, similar, and / or functionally equivalent parts are provided with the same reference numerals.

[0019] Showing: Fig. 1 an embodiment of the carbon fiber reinforced component according to the invention, Fig. 2 a cross section through the embodiment according to Fig. 1, Fig. 3 shows a further embodiment of the carbon fiber reinforced component according to the invention.

[0020] In Fig. 1 shows a first embodiment of the carbon fiber reinforced component according to the invention, wherein Fig. 1a a top view and Fig. 1b shows a schematic layer sequence. The carbon fiber-reinforced component 1 has several superimposed carbon fiber-reinforced layers 3a, 3b, 3c. Between each two directly superimposed carbon fiber-reinforced layers 3, there is a glass fiber-reinforced layer 5. Thus, the glass fiber-reinforced layer 5a is arranged between the carbon fiber-reinforced layers 3a and 3b, and the glass fiber-reinforced layer 5b is arranged between the carbon fiber-reinforced layers 3b and 3c. The top and bottom carbon fiber-reinforced layers 3a, 3c are each covered with a glass fiber-reinforced layer 5c and 5d, respectively ( Fig. 1b). The glass fiber-reinforced layers 5a, 5b, 5c, 5d are angularly offset from one another with respect to the direction of extension R of the glass fibers, which are arranged perpendicular to each other.

[0021] The glass fiber reinforced layers 5 are, as in Fig. 1a on the glass fiber reinforced layer 5c, which rests on the carbon fiber reinforced layer 3a, is formed as a round patch and only partially covers the carbon fiber reinforced layer 3a. In the center of the carbon fiber reinforced component 1, a through-hole 7 is formed to accommodate a connecting element, which penetrates all carbon fiber and glass fiber reinforced layers 3, 5. The glass fiber reinforced layer 5d, which partially rests on the carbon fiber reinforced layer 3a, projects beyond the carbon fiber reinforced layer 3a in the direction of the through-hole 7, projecting radially into the through-hole 7. The lamination of the various layers 3 and 5 results in different regions. In the area of ​​GRP partially covering the through-hole 7, only the pure glass-fiber reinforced layer 5 extends. This is adjoined to the outside by a transition area GRP / CFRP, which, as in Fig. 2, a thickening is formed by lamination of several superimposed layers 3, 5. The carbon fiber reinforced layer 3a, located below the glass fiber reinforced layer 5d, projects outwardly beyond the GRP / CFRP transition area and forms the outer CFRP area.

[0022] As in Fig. As shown in Figure 2, a moisture drainage hole 9 is formed in the GRP region of the pure glass fiber reinforced layer 5c near the through-hole 7. This hole serves to drain moisture from the component 1, such as splash water. A metallic bolt 11 is inserted into the through-hole 7 as a connecting element 11. This bolt is glued into the through-hole or laminated into the component 1. Due to this design, the carbon fibers of the carbon-reinforced layer 3 can be exposed and adjacent to the through-hole 7 without contacting the metallic bolt 11 guided through the through-hole 7.

[0023] A further embodiment of the carbon fiber reinforced component according to the invention is shown in Fig. 3. Alternatively to the Fig.In this case, the patches 13 are rectangular, while the patches 13 are rounded in the glass fiber-reinforced layers 5. The patches 13 are stacked so that the glass fibers run diagonally to each other.

[0024] After the bolt 11 is attached to the carbon fiber-reinforced component 1, it is fastened to a metallic component via the bolt 11. This metallic component can be a vehicle body component made of steel or aluminum, whereas the carbon fiber-reinforced component 1 is designed as an add-on component for the vehicle. Thus, a carbon fiber-reinforced spoiler can be attached to a steel cross member of the vehicle via the described carbon fiber-reinforced component.

Claims

[1] Carbon fiber reinforced or CFRP component for connection to a metallic connecting element, comprising a through-opening (7) for receiving the metallic connecting element (11), wherein the component (1) consists of several superimposed carbon fiber-reinforced or CFRP layers (3), wherein between each two directly superimposed carbon fiber-reinforced or CFRP layers (3), at least one glass fiber-reinforced or GFRP layer (5) is arranged partially in the region of the through-opening (7), completely enclosing the through-opening, which projects beyond the carbon fiber-reinforced or CFRP layers (3) in the direction of the through-opening (7) and projects radially into the through-opening (7), wherein each of the glass fiber-reinforced or GFRP layers (5) is integrated into at least one of the directly superimposed carbon fiber-reinforced or CFRP layers (3) and forms a transition region of carbon fiber-reinforced or CFRP layers and glass fiber-reinforced or GFRP layers, characterized by , that a moisture drainage hole (9) is formed within the glass fiber reinforced layer (5) between the transition area (GRP / CFRP) and the through opening (7). [2] Carbon fiber reinforced component according to claim 1, characterized by that the glass fiber reinforced layers (5) have an angular offset in their fiber orientation to one another. [3] Carbon fiber reinforced component according to claim 1 or 2, characterized by that the glass fiber reinforced layer (5) surrounding the through opening (7) is designed as a round or rectangular plate. [4] Vehicle in which a metallic body component is mechanically connected to a carbon fibre-reinforced component (1) by means of a metallic connecting element (11), wherein the body component and the carbon fibre-reinforced component (1) have through-openings (7) lying one above the other, into which the metallic connecting element (11) is inserted in a force-fitting and / or material-fitting manner, characterized by that the carbon fiber reinforced component (1) is designed according to at least one of the preceding claims. [5] Vehicle according to claim 4, characterized by that the metallic body component is made of steel or aluminum. [6] Vehicle according to claim 4 or 5, characterized by that the metal body component is designed as a cross member of the vehicle front end and the carbon fiber reinforced component (1) is designed as a spoiler.

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