Vehicle floor assembly
The vehicle floor assembly manufactured through one-piece molding technology solves the problems of high cost and complex assembly in the existing body manufacturing process, achieves high accuracy and multi-connection possibilities, and improves the collision performance and structural rigidity of the vehicle through integrated battery box cover and reinforced beams.
Patent Information
- Application Number
- CN202411286642.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-09-14
- Filing Date
- 2024-09-13
- Publication Date
- 2025-03-14
AI Technical Summary
Existing motor vehicle bodies have problems with high costs, complex assembly and insufficient geometric accuracy in the manufacturing process, especially in providing different connection possibilities and special collision characteristics.
A vehicle floor assembly is adopted, which is manufactured in a molding press by one-piece molding technology, with a surface bottom and a molding part, which can be used to integrate the upper cover of the battery box, and to set high tensile strength in local areas through thermoforming and pressurizing hardening processes to reduce the use of additional components.
It realizes low-cost and high-precision manufacturing of the vehicle base plate, provides a variety of connection possibilities, and improves the collision performance and overall structural rigidity of the vehicle through the integrated battery box cover and reinforced beams.
Smart Images
Figure CN119611542A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a vehicle floor assembly having a vehicle floor for installation on a motor vehicle body or as a component of a motor vehicle body. Background Art
[0002] A motor vehicle body is known from the prior art. Such a motor vehicle body is used in motor vehicles, in particular in passenger cars. Passenger cars are driven by internal combustion engine-type drives, but are also increasingly being driven by electric drives.
[0003] Such monocoques are made of individual sheet metal components produced using forming technology. These sheet metal components are mostly made of steel sheet alloys, but also of aluminum components in individual cases. For this purpose, individual components such as, for example, A-pillars, B-pillars, C-pillars, various longitudinal beams or cross beams are produced separately and then assembled into the monocoque using joining technology.
[0004] Hot forming and press hardening processes are also used for individual components. As a result, tensile strengths of more than 1000 MPa can be set on hardenable steel alloys. Summary of the invention
[0005] The object of the invention is to provide a vehicle floor panel which can be produced simply in terms of production technology but also cost-effectively with regard to its production costs, has improved geometric accuracy and has different connection possibilities for other components and special settings for crash behavior.
[0006] The above objects are achieved in a vehicle floor assembly.
[0007] The vehicle floor assembly has a vehicle floor as a component of the motor vehicle body. For this purpose, the vehicle floor is manufactured in one piece using molding technology and then installed in the load-bearing motor vehicle body. For this purpose, the vehicle floor has a flat bottom and has moldings on two opposite longitudinal sides and two opposite end faces. The molding relates to the vertical direction of the motor vehicle downward. Instead of the molding, it can also be said that it is a molded edge or a surrounding edge. A hood-shaped body or a hood-shaped groove is thus generated. This hood-shaped body constitutes the vehicle floor. The opening of the hood-shaped body points downward with respect to the vertical direction of the motor vehicle in the installed state in the motor vehicle body. Therefore, according to the present invention, in terms of possible functional integration, it is achieved that the vehicle floor that forms the bottom or the closure of the passenger compartment downward also forms the upper cover of the electric energy storage device or the drive battery. Therefore, the vehicle floor together forms the upper part or the upper cover of the battery box. In particular, the downwardly pointing molding or edge is provided with a flange, so that the lower part of the battery box can be coupled.
[0008] At the same time, according to the invention, the vehicle floor is also produced in one piece from a sheet metal blank in one press stroke on a large press. The vehicle floor has regions with different tensile strengths and / or different wall thicknesses. By this measure, in regions where this is required locally, for example, a higher strength can be provided by a greater wall thickness or, in the case of hot forming and press hardening techniques with tailored tempering and thus increased tensile strength, a higher strength can also be provided. The regions with higher strength have in particular a tensile strength of more than 1000 MPa, in particular more than 1350 MPa, particularly preferably more than 1500 MPa and very particularly preferably more than 1800 MPa, in individual cases even more than 2000 MPa.
[0009] Particularly preferably, for example, regions that must have a particular connection strength can be reinforced. This can be, for example, a shaped cross member extending transversely to the direction of travel, which also serves as a seat cross member. At the same time, this also serves to strengthen the manufactured motor vehicle body and to reinforce the passenger compartment, in particular in the event of a side impact. Such a cross brace has locally a high tensile strength and / or an increased wall thickness over its longitudinal extension, the longitudinal extension being oriented in the transverse direction of the vehicle.
[0010] In the sense of the invention, one-piece means the use of a sheet metal blank. The sheet metal blank itself can be formed in one piece and of a uniform material. However, the sheet metal blank can also be provided as a spliced rolled blank or a tailored welded blank. Finally, in a tailored welded blank, locally different wall thicknesses and / or locally different material properties can be used in order to construct the strength subsequently desired in targeted local areas. In the case of a tailored welded blank, the individual sheet metal layers are preferably placed abuttingly against one another and welded, in particular laser welded. However, there can also be overlapping areas, which are then spot welded, for example.
[0011] According to the invention, a further advantage is that the sheet metal blank is then completely provided before the actual forming. The entire base plate is then produced in one forming process or one forming press and one press stroke using a hot forming process and a press hardening process. If the base plate is to be produced as a cold-formed component, this can also be formed in several stages, but always in one forming press as an entire component. This allows the geometrical accuracy of the individual components to be significantly increased compared to the methods known from the prior art.
[0012] At the same time, other additional components can be dispensed with, since otherwise the longitudinal and cross members would be built into the floor area of the motor vehicle body and the corresponding floor would only serve as a closing plate or be built in between. For example, the strengthening function of the longitudinal and cross members can be integrated into the floor by corresponding shaping and / or locally strengthened areas. At the same time, the function of the battery box cover is also integrated by molding. The overall production costs of the motor vehicle body are thus also reduced, since different individual components do not need to be manufactured separately and then assembled together.
[0013] The overall dimensions of the floor are therefore greater than 80 cm×100 cm, preferably greater than 100 cm×150 cm. The vehicle floor extends substantially in the vehicle body in the transverse direction of the vehicle from one sill to the opposite sill. With respect to the longitudinal direction of the vehicle, the vehicle floor extends substantially from the bulkhead or firewall in the front region of the vehicle to the rear seat support in the rear region of the vehicle.
[0014] Preferably, at least individual sheets, in particular in the case of tailor-welded blanks, are selected from the alloy specifications described below. Accordingly, a ductility range between 500 MPa and 1000 MPa, or between 500 MPa and 850 MPa, or also less than 450 MPa can be set. In the case of the high-strength or relatively high-strength or very high-strength range, corresponding parameters of more than 1000 MPa are set by using hot forming and press hardening processes.
[0015] The types of steel used can be used as examples below. In particular, different types of steel can be combined with one another in tailor-welded blanks. The corresponding strength ranges for hard or soft areas or strong or ductile areas can be found in the table. All alloy components are given in % by weight, with residual iron and impurities resulting from melting being added to the corresponding hardenable steel alloy. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Other advantages, features, characteristics and aspects of the present invention are the subject of the following description. Preferred design variants are shown in schematic diagrams. They are used to simplify the understanding of the present invention. It is shown therein:
[0017] Figure 1 A motor vehicle body for a motor vehicle is shown as a partial cross-sectional view;
[0018] Figure 2 A top view, a longitudinal section view and a cross-sectional view of a vehicle floor assembly according to the present invention are shown;
[0019] Figure 3 A further design scheme according to the present invention is shown;
[0020] Figure 4 Shows Figure 2An alternative design variant of ;
[0021] Figure 5 Show Figure 4 Another alternative design variation of;
[0022] Figure 6 A further alternative design variant is shown.
[0023] Reference numerals list
[0024] 1: Motor vehicle body
[0025] 2: Threshold
[0026] 3: A-pillar
[0027] 4: Vehicle floor
[0028] 5: Vehicle floor assembly
[0029] 6: Stringer
[0030] 7: Rear seat support
[0031] 8: Forming part / frame
[0032] 9: Flange
[0033] 10: Shell / Groove
[0034] 11: Battery bracket
[0035] 12: Seat beam
[0036] 13: Crossbeam / Horizontal hemming
[0037] 14: Accommodation
[0038] 15: Sleeve
[0039] 16: Slot
[0040] 17: Patch
[0041] 18: Larger wall thickness
[0042] 19: Smaller wall thickness
[0043] X: Longitudinal direction of the vehicle
[0044] Y: Transverse direction of the vehicle
[0045] Z: Vertical direction of the vehicle DETAILED DESCRIPTION
[0046] Figure 1A motor vehicle body 1 for a motor vehicle is shown as a partial sectional view. The A-pillars 3 and the door sills 2 shown above can be seen. A floor panel 4 is arranged below the motor vehicle body 1, thereby realizing a vehicle floor assembly 5. In addition, longitudinal beams 6 are arranged opposite each other at the front and a rear support 7 is formed in the rear area.
[0047] Figure 2 a. Figure 2 b and Figure 2 c shows a top view, a longitudinal section and a cross-sectional view of a vehicle floor assembly 5 according to the invention.
[0048] The vehicle floor 4 according to the present invention has a frame or a molded portion 8 in a circumferential manner, which is molded downward with respect to the vertical direction Z of the motor vehicle. Therefore, it can be constructed as a circumferential frame 8. A circumferential flange 9 is arranged outwardly opposite to the vehicle floor so as to couple with the lower shell or groove 10, thereby forming a battery holder 11 as a whole. Therefore, the vehicle floor 4 seems to constitute the upper cover of the battery holder 11. The vehicle floor extends from one door sill 2 to the opposite door sill 2 on the entire bottom of the vehicle, and therefore extends from the front wall or the firewall to the rear back panel with respect to the longitudinal direction X of the motor vehicle. In addition, the crossbeam 13 is formed, which has a receiving portion 14 at the same time and is therefore constructed as a seat crossbeam. The sleeve 15 can extend below the receiving portion 14. These sleeves 15 are used as reinforcements or spacers. Then a cover-shaped groove 16 is constructed in the area located at the back in the vertical direction. The cap-shaped groove 16 can be used, for example, to accommodate power electronics of a battery (not shown in detail), which are arranged in the battery holder 11, but this is not shown in detail here. In particular, for example, a high-strength region can be formed in the region of the crossbeam or transverse bead 13. Thus, sufficient rigidity is achieved in the transverse direction Y of the vehicle.
[0049] Figure 3 a. Figure 3 b and Figure 3 C shows a further design, especially when taking into account a greater or lesser wall thickness and / or an increased or lesser tensile strength and / or the arrangement of the corresponding patch 17. Therefore, in particular in the region of the transverse bead 13, a patch 17 is applied here, which strengthens the transverse bead 13. The entire vehicle floor 4 is formed as a one-piece component. For this purpose, a sheet metal blank is first provided as a tailored plate. Therefore, a greater wall thickness 18 is constructed in the region located in the front along the longitudinal direction X of the motor vehicle. A greater tensile strength can also be constructed here alternatively. Next, a smaller wall thickness 19 or a lower tensile strength is constructed in comparison. In the rear region, a greater wall thickness is constructed again, and a greater tensile strength can be constructed alternatively or in addition.
[0050] according to Figure 3b. Preferably, thicker or greater wall thickness 18 is arranged in the front and rear areas in the longitudinal direction of the motor vehicle. This is used to provide reinforcement for frontal collision or rear-end collision. When the seat cross member is arranged with a greater wall thickness 18, the rigidity during a side collision is thereby increased.
[0051] Figure 4 a. Figure 4 b and Figure 4 c shows Figure 2 Here, the transverse bead 13 is also provided with a patch 17 which extends over the entire vehicle width with respect to the vehicle transverse direction Y.
[0052] Figure 5 a. Figure 5 b and Figure 5 c shows Figure 4 Another alternative design variant. Here, a patch 17 is placed again in the rear area of the groove 16. This patch 17 also extends over the entire vehicle width, such as in Figure 5 As shown in c.
[0053] Figure 6 a. Figure 6 b and Figure 6 Figure c shows another alternative design variant. Here, the circumferential molding 8 is only slightly formed on the vehicle floor 4 in the vehicle vertical direction Z. This circumferential molding also has a circumferential flange. A second transverse bead is formed in the rear region, which extends substantially over the entire width of the floor in the vehicle transverse direction.
[0054] The steel types used can be used as examples for all variants of the invention. In particular, different types of steel can be combined with one another in tailored welded blanks. The corresponding strength ranges for hard or soft areas or strong or ductile areas can be derived from the table. All alloy components are given in % by weight, with residual iron and impurities resulting from melting being added to the corresponding hardenable steel alloy.
[0055]
Claims
1. A vehicle floor assembly (5) having a vehicle floor (4) as a component of a motor vehicle body (1), the vehicle floor assembly having a flat bottom and having a molding (8) on two opposite longitudinal sides and two opposite end sides pointing downward with respect to the vertical direction (Z) of the motor vehicle, so that a hood-like body is formed by the vehicle floor (4), characterized in that The vehicle floor (4) is produced in one piece from a sheet metal blank, in particular in one press stroke, and the vehicle floor (4) seals the battery compartment in a sealed manner upward in a vertical direction (Z) of the motor vehicle, wherein the vehicle floor (4) optionally has areas with different tensile strengths and / or different wall thicknesses.
2. The vehicle floor assembly (5) according to claim 1, characterized in that: The vehicle floor assembly is manufactured as a thermoformed and press-hardened component.
3. The vehicle floor assembly (5) according to claim 1 or 2, characterized in that: The high-strength region has a tensile strength of 1350 MPa or more.
4. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that The soft region is constructed with a tensile strength Rm of less than 1000 MPa, preferably less than 850 MPa.
5. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that The vehicle floor (4) extends in a transverse direction (Y) of the motor vehicle substantially from one door sill (2) to an opposite door sill (2).
6. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that The vehicle floor (4) has a circumferential flange (9) for coupling to a lower shell (10) of a battery box.
7. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that A cap-shaped groove (16) is formed in a rear section of the vehicle floor (4) with respect to the longitudinal direction (X) of the vehicle, wherein power electronics of a drive battery and / or a cooling fluid pump are inserted into the cap-shaped groove (16).
8. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that At least one transverse bead (13) is integrally formed in the vehicle floor (4), so that the transverse bead (13) is designed as a seat cross member.
9. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that A foot well recess is formed downwardly with respect to the vertical direction (Z) of the motor vehicle.
10. The vehicle floor assembly (5) according to any one of the preceding claims, characterized in that A patch (17) is applied at least in regions in such a way that a double layer is formed.