Lightweight carbon fiber vehicle body middle floor

Abstract

The utility model relates to the technical field of automobiles, and discloses a lightweight carbon fiber middle floor for an automobile body, which is formed by vacuum infusion of carbon fiber paving layers, the paving layer angles of the carbon fiber paving layers include 0 degree, 90 degrees, + 45 degrees and-45 degrees, and multi-directional strength and rigidity can be met. And meanwhile, the laying layer angle layout adopts an up-and-down symmetrical design, so that buckling deformation caused by thermal expansion can be avoided. The product structure is achieved in a carbon fiber integrated forming mode, and the complexity of a traditional steel middle floor structure is greatly reduced. The carbon fiber material is low in density and high in material plasticity, the local material thickness of the position with high stress can be adjusted instead of being integrally thickened according to the guidance of a strength durability simulation result in the design stage, and therefore the weight of the middle floor can be further reduced; the carbon fiber middle floor and the peripheral structure are connected in an adhesive lap joint mode and can be detached, maintained and replaced, and the problem that the maintainability of a traditional welding middle floor is poor under the conditions of rear collision, side collision and the like is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, and more particularly to a lightweight carbon fiber vehicle body mid-floor. Background Art

[0002] Vehicle weight is a constant topic in the current automotive industry. Whether it's a traditional fuel-powered vehicle or a new energy passenger car, vehicle weight is closely linked to indicators such as energy consumption, power, and cost. Especially with the booming development of new energy passenger vehicles, energy conservation and weight reduction, along with vehicle safety, comfort, and intelligence, have become key priorities for automakers during vehicle development.

[0003] Traditional body-in-white (BIW) floor panels utilize stamped steel structures. This involves complex stamping, welding, and painting processes, resulting in poor maintainability and high weight. The optimal use of lightweight materials is a key weight-reduction challenge for body engineers during the vehicle development phase. Utility Model Content

[0004] The purpose of the utility model is to provide a lightweight carbon fiber vehicle body mid-floor to solve the problems in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0006] A lightweight carbon fiber vehicle body center floor, wherein the carbon fiber vehicle body center floor 1 is connected to the center rear floor 2 and the rear floor 3. The carbon fiber vehicle body center floor 1 is composed of vacuum infused carbon fiber plies, and the ply angles of the carbon fiber plies include 0°, 90°, +45°, and -45°.

[0007] Furthermore, the carbon fiber body mid-floor 1 is provided with mounting positioning holes 100, a local sink 200, a maintenance port 300, a maintenance port cover mounting hole 400, a seat belt buckle limiting hole 500, a seat belt buckle fixing through hole 600 and a seat mounting through hole 700.

[0008] Furthermore, the carbon fiber body middle floor 1 is divided into four areas, the first area includes the overlap position of the carbon fiber body middle floor 1 and the middle rear floor 2, the second area includes the position of the maintenance cover mounting hole 400 and the local sinkhole 200, the third area includes the rear passenger seating area on the carbon fiber body middle floor 1, and the fourth area includes the position of the seat mounting hole 700.

[0009] Furthermore, the number of carbon fiber plies in the first region is four, the number of carbon fiber plies in the second region is three, the number of carbon fiber plies in the third region is eight, and the number of carbon fiber plies in the fourth region is ten.

[0010] Furthermore, the ply angles of each layer of the carbon fiber ply in the first region are 0° and

[0011] / 90°, +45° / -45°, +45° / -45°, 0° / 90°; the layup angles of each layer of the carbon fiber ply in the second area are 0° / 90°, +45° / -45°, +45° / -45° in sequence; the layup angles of each layer of the carbon fiber ply in the third area are 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, +45° / -45°, 0° / 90°, +45° / -45°, 0° / 90°; the layup angles of each layer of the carbon fiber ply in the fourth area are 0° / 90°, +45°

[0012] / -45°, 0° / 90°, +45° / -45°, 0° / 90°, 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, 0° / 90°.

[0013] Furthermore, the thickness of each layer of the carbon fiber ply is between 0.1 mm and 0.4 mm.

[0014] Furthermore, the carbon fiber plies have a ply angle layout that is vertically symmetrical.

[0015] Furthermore, a raised portion 800 is partially provided on the floor 1 of the carbon fiber vehicle body.

[0016] Furthermore, a side edge of the floor panel 1 in the carbon fiber vehicle body is provided with an escape hole 900 for evading the fixing nut plate of the rear seat.

[0017] Furthermore, the floor 1 of the carbon fiber vehicle body is connected and sealed to the surrounding structure by means of adhesive overlap.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The utility model provides a lightweight carbon fiber vehicle body center floor. The carbon fiber vehicle body center floor adopts a vacuum infusion multi-layer carbon fiber lay-up design during molding. The thickness of a single layer is between 0.1-0.4, and four lay-up angles of 0°, 90°, +45°, and -45° are adopted to meet multi-directional strength and stiffness. At the same time, the lay-up angle layout adopts a vertically symmetrical design to avoid warping and deformation caused by thermal expansion.

[0020] This utility model provides a lightweight carbon fiber center floor panel, utilizing a one-piece carbon fiber molding process to achieve its product structure, significantly reducing the structural complexity of traditional steel center floors. Carbon fiber's low density and high plasticity allow the design phase to be guided by strength and durability simulation results, allowing for localized adjustments to the thickness of the material in locations with high stresses rather than an overall thickening, further reducing the center floor's weight. Furthermore, the carbon fiber center floor panel is connected to the surrounding structure using adhesive lap joints, allowing for removable, repairable, and replaceable panels, addressing the poor repairability of traditional welded center floors in the event of rear-end or side impacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 is a distribution diagram of a floor in a lightweight carbon fiber vehicle body in one embodiment;

[0023] Figure 2 A structural diagram of a floor in a lightweight carbon fiber vehicle body in one embodiment;

[0024] Figure 3 is a regional distribution diagram of a floor in a lightweight carbon fiber vehicle body in one embodiment;

[0025] Figure 4 A schematic diagram of the connection between a floor and surrounding structures in a lightweight carbon fiber vehicle body in one embodiment;

[0026] 1. Carbon fiber body floor, 1a. First area, 1b. Second area, 1c. Third area, 1d. Fourth area;

[0027] 100. Installation positioning hole, 200. Local sinking pit, 300. Maintenance port, 400. Maintenance port cover installation hole, 500. Seat belt buckle limit hole, 600. Seat belt buckle fixing hole, 700. Seat installation hole, 800. Bump, 900. Avoidance hole;

[0028] 2. Middle and rear floor;

[0029] 3. Rear floor;

[0030] 4.Viscose. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See Figures 1 to 4 This embodiment provides a lightweight carbon fiber body center floor, which adopts carbon fiber one-piece molding technology. The carbon fiber body center floor 1 is connected to the center rear floor 2 and the rear floor 3. The rear floor 2 can be an integral die-cast or a traditional sheet metal structure, and the rear floor 3 can be injection molded or other forms.

[0033] In order to ensure accurate assembly, two mounting positioning holes 100 are provided on the carbon fiber vehicle body mid-floor 1 .

[0034] In order to meet the requirements of standard parts matching, a local sink 200 is provided on the left side of the floor 1 in the carbon fiber body.

[0035] In order to facilitate subsequent repair and maintenance, a maintenance port 300 is reserved on the right side of the floor 1 in the carbon fiber body for the connection position of the battery and the high-voltage wiring harness. In addition, the maintenance port 300 needs to be provided with a cover plate. Therefore, four maintenance port cover mounting holes 400 are reserved around the maintenance port 300.

[0036] In order to avoid the rear seat fixing nut plate, the front end side edge of the floor 1 in the carbon fiber body is partially cut out to form an avoidance hole 900.

[0037] In order to improve the overall rigidity of the floor panel 1 of the carbon fiber vehicle body, a raised portion 800 is provided at a local middle position of the floor panel 1 of the carbon fiber vehicle body.

[0038] In addition, a seat belt buckle limiting hole 500 and a seat belt buckle fixing through hole 600 are respectively provided on the left and right sides of the rear part of the floor 1 in the carbon fiber body, and two seat installation through holes 700 are also provided on the right rear side.

[0039] The carbon fiber body middle floor 1 is connected and sealed to the surrounding structure by means of adhesive overlap. For example, a sufficient length of overlap edge is reserved at the connection between the carbon fiber body middle floor 1 and the middle rear floor 2, and a detachable overlap is achieved with the middle rear floor 2 by means of adhesive 4. With such a design, if the carbon fiber body middle floor 1 encounters a rear collision, a side collision, or the like and needs to be repaired, the carbon fiber body middle floor 1 can be removed for repair and replacement.

[0040] In another embodiment, the connection method between the floor 1 and the surrounding structure in the carbon fiber body can be selected into screw connection, SPR riveting and other forms according to different vehicle models, and the sealing can also be changed to foam sealing.

[0041] The floor 1 of the carbon fiber vehicle body is constructed by vacuum infusion of multiple carbon fiber layers. To meet multi-directional strength and stiffness requirements, the carbon fiber layers are laid at four angles: 0°, 90°, +45°, and -45°.

[0042] At the same time, in order to avoid warping deformation caused by thermal expansion, the ply angle layout of the carbon fiber plies adopts a vertically symmetrical design.

[0043] In this embodiment, the carbon fiber vehicle body center floor 1 is divided into four areas for overlapping positions and performance feedback: the first area 1a includes the overlapping position of the carbon fiber vehicle body center floor 1 and the center rear floor 2, the second area 1b includes the position of the maintenance cover mounting hole 400 and the local sinkhole 200, the third area 1c includes the rear passenger seating area on the carbon fiber vehicle body center floor 1, and the fourth area 1d includes the position of the seat mounting hole 700; and different material thicknesses are used for different areas to maximize the satisfaction of special performance requirements for local positions.

[0044] The number of carbon fiber plies in the first area 1a is four, the number of carbon fiber plies in the second area 1b is three, the number of carbon fiber plies in the third area 1c is eight, and the number of carbon fiber plies in the fourth area 1d is ten.

[0045] The thickness of each layer of the carbon fiber ply is between 0.1 mm and 0.4 mm, so as to ensure that the thickness of the first region 1a and the second region 1b is between 0.8 mm and 1.2 mm, and the thickness of the third region 1c and the fourth region 1d is between 2.0 mm and 3.5 mm.

[0046] In addition, in order to meet the multi-directional strength and stiffness requirements, the ply angles of each layer of the carbon fiber ply in the first area 1a are 0° / 90°, +45° / -45°, +45° / -45°, and 0° / 90°, respectively; the ply angles of each layer of the carbon fiber ply in the second area 1b are 0° / 90°, +45°

[0047] / -45°, +45° / -45°, the layup angles of each layer of the carbon fiber ply in the third area 1c are 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, +45° / -45°, 0° / 90°, +45° / -45°, and 0° / 90°, respectively. The layup angles of each layer of the carbon fiber ply in the fourth area 1d are 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, 0° / 90°, 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, and 0° / 90°, see Table 1 for details.

[0048] Table 1 Carbon fiber ply angle distribution

[0049]

[0050] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lightweight carbon fiber vehicle body mid-floor, wherein the carbon fiber vehicle body mid-floor (1) is connected to a mid-rear floor (2) and a rear floor (3), and is characterized by: The carbon fiber vehicle body mid-floor (1) is formed by vacuum infusion carbon fiber plies, and the ply angles of the carbon fiber plies include four ply angles: 0°, 90°, +45°, and -45°.

2. The lightweight carbon fiber vehicle body mid-floor according to claim 1, characterized in that: The carbon fiber vehicle body mid-floor (1) is provided with mounting positioning holes (100), a local sinking pit (200), a maintenance opening (300), a maintenance opening cover mounting hole (400), a seat belt buckle limiting hole (500), a seat belt buckle fixing through hole (600), and a seat mounting through hole (700).

3. The lightweight carbon fiber vehicle body mid-floor according to claim 2, characterized in that: The carbon fiber vehicle body mid-floor (1) is divided into four areas, the first area includes the overlap position of the carbon fiber vehicle body mid-floor (1) and the mid-rear floor (2), the second area includes the position of the maintenance cover mounting hole (400) and the local sinkhole (200), the third area includes the rear passenger seating area on the carbon fiber vehicle body mid-floor (1), and the fourth area includes the position of the seat mounting hole (700).

4. The lightweight carbon fiber vehicle body mid-floor according to claim 3, characterized in that: The number of carbon fiber plies in the first region is four, the number of carbon fiber plies in the second region is three, the number of carbon fiber plies in the third region is eight, and the number of carbon fiber plies in the fourth region is ten.

5. The lightweight carbon fiber vehicle body mid-floor according to claim 4, characterized in that: The laying angles of each layer of the carbon fiber ply in the first area are 0° / 90°, +45° / -45°, +45° / -45°, and 0° / 90° in sequence; the laying angles of each layer of the carbon fiber ply in the second area are 0° / 90°, +45° / -45°, and +45° / -45° in sequence; the laying angles of each layer of the carbon fiber ply in the third area are 0° / 90°, +45° / -45°, and 0° in sequence. / 90°, +45° / -45°, +45° / -45°, 0° / 90°, +45° / -45°, 0° / 90°, and the ply angles of each layer of the carbon fiber ply in the fourth area are 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, 0° / 90°, 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, 0° / 90°, +45° / -45°, 0° / 90°.

6. The lightweight carbon fiber vehicle body mid-floor according to claim 5, characterized in that: The thickness of each layer of the carbon fiber ply is between 0.1 mm and 0.4 mm.

7. The lightweight carbon fiber vehicle body mid-floor according to claim 6, characterized in that: The ply angle layout of the carbon fiber plies is symmetrical up and down.

8. The lightweight carbon fiber vehicle body mid-floor according to claim 1, characterized in that: A raised portion (800) is provided locally on the floor (1) of the carbon fiber vehicle body.

9. The lightweight carbon fiber vehicle body mid-floor according to claim 1, characterized in that: The side of the floor (1) in the carbon fiber vehicle body is provided with an avoidance hole (900) for avoiding the fixing nut plate of the rear seat.

10. The lightweight carbon fiber vehicle body mid-floor according to claim 1, characterized in that: The floor (1) in the carbon fiber vehicle body is connected and sealed to the surrounding structure by means of adhesive overlap.

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