Vehicle floor assembly

Abstract

The invention relates to a vehicle floor assembly (5) having a vehicle floor (4) as a component of a motor vehicle body, which vehicle floor assembly has a flat floor region and forms on two opposite longitudinal sides and on two opposite end sides so as to form the vehicle floor (4), which is arranged between two sills (2). The invention relates to a vehicle floor (4) for a motor vehicle, said vehicle floor (4) having a flat bottom region in which at least one groove (7) is formed which is formed so as to point downwards in the vertical direction (Z) of the motor vehicle, the vehicle floor (4) being produced integrally during the stroke of a press, the vehicle floor (4) being formed integrally with regions of different wall thicknesses and / or different tensile strengths (Rm) from one another.

Description

Technical Field

[0001] The invention relates to a vehicle floor assembly having a vehicle floor for mounting or integrating 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 a drive device such as an internal combustion engine, but are also increasingly being driven by an electric drive device.

[0003] Such monocoques are made of individual sheet metal components produced by 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 subsequently assembled into the monocoque using joining technology.

[0004] Hot deformation 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. For example, a base plate is known from DE 10 2004 037 789 B3. 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-mentioned object is achieved in the vehicle floor assembly of the present application.

[0007] The vehicle underbody assembly has a vehicle floor panel which serves as an integral component of a motor vehicle body joined in a material-locking manner. For this purpose, the vehicle floor panel is produced in one piece using molding technology and is then inserted into the load-bearing motor vehicle body or welded thereto. For this purpose, the vehicle floor panel has a flat bottom and moldings on two opposite longitudinal sides and two opposite end faces. The moldings are in the vertical direction of the vehicle and are designed at least in sections as flanges.

[0008] A flat bottom means that a bottom structure is formed. However, a flat bottom in the sense of the present invention does not mean that the bottom is approximately flat or planar.

[0009] According to the invention, at least one downwardly directed groove is formed in the floor region relative to the vertical direction of the vehicle. The vehicle floor itself is produced in one piece in a press stroke and has regions with different wall thicknesses and / or different tensile strengths Rm.

[0010] In the sense of the invention, one-piece or one-piece means that the sheet metal blank is formed in a so-called large-space press. The sheet metal blank itself can be, for example, a tailored blank, thus a blank welded together from different sheet metal sections, but which is then formed as a sheet metal blank in a large-space press. The measures according to the invention improve the geometric accuracy of the entire vehicle floor both in the longitudinal direction of the vehicle and in the transverse direction of the vehicle.

[0011] In addition, the vehicle floor has regions with different tensile strengths Rm and / or different wall thicknesses. By means of this measure, in regions where this is required locally, for example by means of a greater wall thickness and / or when using a hot deformation and press hardening process, a higher strength can be provided as a higher tensile strength compared to other regions directly adjacent thereto. This then has a softer material structure and they can also be referred to as so-called soft zones. The regions with higher strength have in particular a tensile strength of greater than 1000 MPa, in particular greater than 1350 MPa, particularly preferably greater than 1500 MPa, very particularly preferably greater than 1800 MPa. The regions with a softer material structure particularly preferably have a tensile strength Rm of less than 1000 MPa, in particular between 500 and 850 MPa.

[0012] Particularly preferably, for example, areas that must have a particular connection strength can be reinforced. This can be, for example, a profiled crossbeam extending transversely to the direction of travel. Particularly preferably, this crossbeam is also used as a seat crossbeam. The seat crossbeam can be profiled as a hollow component in its own cross section. The seat crossbeam then has a higher tensile strength and / or a greater wall thickness than the area adjacent to it. In particular, in the case of a seat crossbeam with a hollow cross section, the sheet metal blank can be constructed as a welded plate in which the cross section of the sheet metal blank part is a hollow component. The hollow component is then formed together in a forming press. The seat crossbeam is also used to reinforce the motor vehicle body produced thereby and to strengthen the passenger compartment in the event of a side impact. The seat crossbeam can also be closed longitudinally from below in sections or completely by a closing plate.

[0013] The sheet metal blank itself can be formed in one piece and of uniform material. For example, the sheet metal blank can then be designed as a tailor-welded rolled plate. However, the sheet metal blank can also be produced as a tailor-welded plate, in which individual sheet metal blanks with different wall thicknesses and / or different material structures are welded together. Here, the sheet metal blanks can be placed abutting one another and, for example, laser welded. However, the sheet metal blanks can also overlap and be spot welded.

[0014] Other longitudinal beams and / or cross beams can be formed into the vehicle floor. Through this measure, the entire bottom area can be strengthened again.

[0015] However, the vehicle floor panel according to the invention is used in particular for electric vehicles, which have energy storage devices in the form of batteries or drive batteries in their floor region, in particular, these drive batteries are inserted into a slot or slots.

[0016] According to the invention, the drive battery is installed from below the vehicle floor in the vertical direction of the motor vehicle and is therefore inserted between the two grooves. The respective vehicle battery or drive battery is then closed by a cover or by the corresponding groove.

[0017] The overall dimensions of the footrest are therefore greater than 80 cm×100 cm, preferably greater than 90 cm×150 cm. The vehicle floor or footrest extends substantially in the motor vehicle body from one door sill to the opposite door sill in the transverse direction of the motor vehicle. In the longitudinal direction of the motor vehicle, the vehicle floor extends substantially from the front wall or firewall in the front area of ​​the motor vehicle to the rear row near the rear area of ​​the motor vehicle.

[0018] The latter, thus the rear support, is preferably coupled to the vehicle floor. It is particularly preferred that the rear support is directly molded with the floor. It is particularly preferred for this purpose that the rear support is formed in one piece, in particular in one piece with the vehicle floor, and is then molded directly on a large-space press. This also saves production costs while increasing the precision of the manufactured component.

[0019] In another particularly preferred design variant, at least two grooves are arranged one after the other in the longitudinal direction of the vehicle. Alternatively or additionally, two grooves are arranged side by side in at least one row in the transverse direction of the vehicle. Preferably, at least two grooves are arranged side by side in each row.

[0020] This measure makes it possible to position the drive battery.

[0021] The individual slots can therefore also be used differently. The drive battery can be arranged in a slot, for example in the front area in front of the driver's seat and the front passenger seat. Here, the drive battery can be arranged. In the rear area, the slots are essentially free and can therefore be used as footwell slots for passengers sitting in the rear.

[0022] In particular, each of the smaller grooves is formed, which are then closed with a cover. Thus, for maintenance purposes or to replace, for example, a drive battery, the cover can also be reversibly removed in the finished motor vehicle body. The cover is preferably sealed with the respective groove.

[0023] In one embodiment, the front groove and the rear groove have the same depth. Alternatively, the front groove and the rear groove have different depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 A lower floor panel for use in a motor vehicle body is shown;

[0026] Figure 2 a to Figure 2 c shows a top view and a cross-sectional view;

[0027] Figure 3 a to Figure 3 c shows a top view and a cross-sectional view;

[0028] Figure 4 a to Figure 4 e shows a top view and a cross-sectional view;

[0029] Figure 5 a to Figure 5 e shows a top view and a cross-sectional view;

[0030] Figure 6 a to Figure 6 c shows a top view and a cross-sectional view.

[0031] Reference numerals list

[0032] 1: Motor vehicle body

[0033] 2: Threshold

[0034] 3: A-pillar

[0035] 4: Vehicle floor

[0036] 5: Vehicle floor assembly

[0037] 6: Flange

[0038] 7: Slot

[0039] 8: wall

[0040] 9: Rear bracket

[0041] 10: Driving battery

[0042] 11: Cover

[0043] 12: Seat beam

[0044] 13: Middle section

[0045] 14: Footwell slot

[0046] 15: Hood-like area

[0047] 16: To the bottom of 7

[0048] 17: Cover

[0049] X: Longitudinal direction of the vehicle

[0050] Y: Transverse direction of the vehicle

[0051] Z: Vertical direction of the vehicle DETAILED DESCRIPTION

[0052] Figure 1 A motor vehicle body 1 is shown. The A-pillar 3 shown above can be seen as a partial section. A vehicle floor panel 4 is mounted below the motor vehicle body 1, thereby realizing a vehicle floor assembly 5. In addition, opposite longitudinal beams and a rear support 9 are formed in the rear area. The sills 2 are arranged on the outside.

[0053] Figure 2 a and Figure 2 b shows the Figure 2 c is a longitudinal section view and a transverse section view along section lines AA and DD.

[0054] The vehicle floor assembly 5 here has a vehicle floor. The vehicle floor 4 has a protruding flange 6 on the front side with respect to the longitudinal direction X of the motor vehicle. In addition, a groove is formed. The groove is formed so as to point downward in the vertical direction Z of the motor vehicle. The wall 8 of the groove 7 produced here surrounds the groove 7 and, as can be seen, has a greater wall thickness and / or a greater tensile strength than other areas of the vehicle floor 4. The course of the wall itself then extends in a circular manner around the groove. The wall itself is arranged oriented in the vertical direction of the motor vehicle and goes around the groove. In addition, a rear support 9 is constructed together in the rear area. The rear support is formed integrally with the vehicle floor 4. The drive battery 10 is arranged in the groove 7 itself, and a cover 11 is arranged to close the groove. A seat cross member 12 arranged on the cover 11 is shown here, and the seat cross member 12 is arranged according to Figure 2 The top view of extends from one side of the motor vehicle body 1 to the opposite one, thus from one door sill 2 to the opposite door sill 2 .

[0055] Figure 2 b shows a cross-sectional view along section line BB. The groove 7 extends from one side of the rocker panel 2 to the opposite side with respect to the transverse direction Y of the vehicle. A large-area drive battery 10 is arranged therein.

[0056] Figure 3 a and Figure 3 b shows Figure 2 a and Figure 2c. The essential difference is that the two grooves are arranged one behind the other with respect to the longitudinal direction X of the vehicle and that in particular the seat cross member 12 is also formed integrally with the vehicle floor 4. The seat cross member 12 itself is also designed as a hollow component in its own cross section. The rear support 9 is thus formed itself and is coupled to the vehicle floor 4 only after the actual vehicle floor 4 has been formed. However, the rear support can also be formed directly with the vehicle floor 4. According to Figure 3 b is a cross-sectional view, the driving battery extends from one side to the opposite side. Figure 3 In the longitudinal direction X of the motor vehicle, the drive battery is interrupted so that a corresponding groove 7 of the footwell of the front seat and the groove 7 are arranged below the footwell of the backrest belt.

[0057] Figure 4 a to Figure 4 e shows an alternative design variant for this purpose. Figure 4 a. Figure 4 b and Figure 4 In case c, two grooves 7 are arranged one behind the other in the longitudinal direction X of the vehicle and one next to the other in the transverse direction Y of the vehicle. Figure 4 a. Figure 4 d and Figure 4 In the case of e, two grooves 7 are arranged one behind the other in the longitudinal direction X of the vehicle, and the two grooves extend substantially over the entire width in the transverse direction Y of the vehicle. According to the cross-sectional view, the surrounding wall 8 is also designed to be reinforced here, but the inner wall located below the seat cross member 12 is not reinforced. The subsection below the seat cross member 12 is designed in the form of a middle section 13, which also has a greater wall thickness and / or a greater tensile strength and extends substantially over the entire width in the transverse direction Y of the vehicle. Therefore, in Figure 4 b and Figure 4 In the case of c, four driving batteries 10 can be arranged. Figure 4 d and Figure 4 In the case of FIG. 4 , two drive batteries 10 are arranged in corresponding grooves. The rear seat panel can again be constructed in one piece with the vehicle floor panel 4 . However, the rear seat panel can also be manufactured separately and then joined to the vehicle floor panel 4 .

[0058] Figure 5 a to Figure 5 e shows another design variant of the present invention. Figure 5 a. Figure 5 b and Figure 5c, the groove 7 is configured as a battery groove in the front in the longitudinal direction X of the vehicle and has a larger longitudinal extension in the longitudinal direction X of the vehicle than the groove located behind it, and the groove 7 is formed as a footrest groove 14 for passengers in the rear row. The footrest groove 14 can be extended in the transverse direction of the vehicle, such as in Figure 5 c is constructed in two parts. However, the footwell groove 14 can also be in the transverse direction of the vehicle, as in Figure 5 In the case of the embodiment of the present invention, the rear seat panel 10 is formed in one piece in the transverse direction Y of the vehicle, and therefore extends substantially over the width of the vehicle. In this design variant, in particular, the rear seat panel can be formed together. Another drive battery 10 can be arranged below the rear seat panel. The drive battery is again closed with a cover 17.

[0059] Figure 6 a to Figure 6 C shows another design variant of the present invention. Here, according to Figure 2 In the longitudinal direction X of the vehicle, two grooves 7 are formed, which are spaced apart from each other. With respect to the vertical direction Z of the vehicle, the drive battery is installed from below. The area 15 between the grooves 7, which overlaps the drive battery in a cover-like manner, has a greater wall thickness and tensile strength area than the bottom 16 of the groove 7 itself. The wall of the groove 7 also has a greater tensile strength. It is then particularly preferred to close the traction battery from below with a cover 17.

[0060] The steel types used can be used as examples for all the variants of the invention below. In particular, different types of steel can be combined with one another in tailored 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 caused by melting being added to the corresponding hardenable steel alloy.

[0061]

Claims

1. A vehicle floor assembly (5), comprising a vehicle floor (4) as an integral component of a motor vehicle body, the vehicle floor assembly having a flat bottom area and having shaped parts on two opposite longitudinal sides and two opposite end sides, thereby forming the vehicle floor (4), the vehicle floor being arranged between two door sills (2), characterized in that In the planar bottom region, at least one groove (7) is formed which is shaped so as to point downward with respect to a vertical direction (Z) of the motor vehicle, wherein the vehicle floor (4) is formed integrally with regions of mutually different wall thicknesses and / or mutually different tensile strengths Rm.

2. The vehicle floor assembly (5) according to claim 1, characterized in that: In one press stroke, the vehicle floor panel (4) is manufactured as a thermally deformed 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 A soft region is formed 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 the transverse direction (Y) of the motor vehicle essentially from one of the door sills (2) to the opposite door sill (2), wherein a flange (6) projecting in an outwardly directed manner is preferably configured, which rests or abuts against the corresponding door sill (5) and engages with the corresponding door sill (5).

6. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that The drive battery (10) is arranged in at least one of the grooves (7), wherein the groove (7) is closed by a cover (17).

7. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that A rear seat panel is arranged at the rear in the longitudinal direction (X) of the motor vehicle, and in particular the rear seat panel is manufactured in one piece with the vehicle floor panel (4).

8. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that The wall-shaped, vertically extending region of the groove (7) has a higher tensile strength Rm and / or a greater wall thickness.

9. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that At least two of the grooves (7) are arranged one behind the other in the longitudinal direction (X) of the motor vehicle and / or at least two of the grooves (7) are arranged next to each other with respect to the transverse direction (Y) of the motor vehicle.

10. The vehicle floor assembly (5) according to any one of the preceding claims, characterized in that Between the two grooves (7) with respect to the vertical direction (Z) of the motor vehicle, a drive battery (10) is arranged from below on the vehicle floor (4).

11. A vehicle floor assembly (5) according to any one of the preceding claims, characterised in that A seat cross member (12) is formed in such a way that it is integrated into the vehicle floor (4), wherein the seat cross member (12) is preferably hollow in its cross section and / or has a greater wall thickness and / or a higher tensile strength.

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