Assembly comprising a vehicle body element and a luggage compartment recess, and motor vehicle comprising such an assembly

Abstract

The invention relates to an assembly comprising a vehicle body element (30) and a luggage compartment recess (32), said vehicle body element receiving the luggage compartment recess (32). The vehicle body element comprises a first upper longitudinal support structure (40), a second upper longitudinal support structure (41) which lies opposite the first upper longitudinal support structure (40), a first lower longitudinal support structure (44) which is parallel to the first upper longitudinal support structure (40), and a second lower longitudinal support structure (45) which is parallel to the second upper longitudinal support structure (41). The vehicle body element (30) additionally comprises a crossbeam (54) which connects the upper longitudinal support structures (40, 41) and the lower longitudinal support structures (44, 45) together. The luggage compartment recess (32) is located between the longitudinal support structures (40, 41, 44, 45) and the crossbeam (54). The rear wall (36) of the luggage compartment recess (32) rests against a shoulder (68) of the crossbeam, a first lateral wall (34) of the luggage compartment recess (32) rests against the first upper longitudinal support structure (40), and a second lateral wall (35) of the luggage compartment recess (32) rests against the second upper longitudinal support structure (40). The invention additionally relates to a motor vehicle (10) comprising such a vehicle body element (30) for receiving a luggage compartment recess (32).

Description

[0001] Description

[0002] ARRANGEMENT WITH A VEHICLE BODY ELEMENT AND A TRUNK RECESS, AND MOTOR VEHICLE WITH SUCH AN ARRANGEMENT

[0003] The invention relates to a vehicle body element and a motor vehicle with such a vehicle body element according to the preamble of the independent patent claims.

[0004] For transporting objects, a motor vehicle usually has a trunk into which items can be loaded. One goal in motor vehicle design is to provide a trunk that is adapted to the vehicle's shape, easily accessible, and with the most usable trunk volume possible. Furthermore, it has been discovered that the space beneath the trunk itself can be used to provide additional usable volume. While this space was previously often used to accommodate a spare tire or emergency tire and / or onboard tool kit, today it is often used as additional trunk space.

[0005] However, the additional space beneath the actual loading floor of the trunk is usually highly fragmented and divided into numerous segments. Furthermore, inserts in this area are known to further restrict the usable volume or lead to further subdivision of the volume.

[0006] From FR 2 950 851 A1, a motor vehicle structure is known which has two substantially parallel longitudinal members joined at a rear cross member. The structure further comprises a plastic tray arranged between the longitudinal members and intended to accommodate a spare wheel, the longitudinal member having a base surface. The cross member has a support surface extending at least partially in the extension of the longitudinal members in the same plane as the base surface, the tray comprising an edge resting on the base surfaces and on the support surface.

[0007] EP 1 612 127 A2 discloses a motor vehicle with storage compartments on the luggage compartment floor. The luggage compartment floor is formed as a sheet metal part welded to the body. The goal is to simplify the construction of the luggage compartment floor. This is achieved by forming a U-shaped cutout in a body structure at the level of a vehicle floor at the rear of the vehicle. A luggage compartment floor frame is arranged at the cutout, and a separate luggage compartment floor frame is attached.

[0008] DE 101 47620 A1 discloses a floor structure in the rear cargo area of ​​a passenger car that, on the one hand, ensures optimal utilization of the construction and storage space, but, on the other hand, also incorporates a simple and cost-effective connection to load-bearing components of the body. The floor section of the rear cargo area is supported, at least in part, by flanges of two opposing rear longitudinal members projecting into the rear cargo area. The flanges of the longitudinal members are arranged offset downwards at a specific distance from the upper edge of the longitudinal members.

[0009] The invention is based on the object of creating a novel trunk recess which has the largest possible volume and the highest possible crash safety and at least partially overcomes the disadvantages known from the prior art.

[0010] The problem is solved by a vehicle body element for accommodating a trunk recess. The vehicle body element comprises a first upper longitudinal member structure, a second upper longitudinal member structure opposite the first upper longitudinal member structure, a first lower longitudinal member structure arranged parallel to the first upper longitudinal member structure, and a second lower longitudinal member structure arranged parallel to the second upper longitudinal member structure. The vehicle body element further comprises a cross member which connects the upper longitudinal member structures and the lower longitudinal member structures to one another, and a trunk recess arranged between the longitudinal member structures and the cross member. A rear wall of the trunk recess rests on a shoulder of the cross member, a first side wall of the trunk recess rests on the first upper longitudinal member structure, and a second side wall of the trunk recess rests on the second upper longitudinal member structure.The vehicle body structure according to the invention makes it possible to create the largest possible usable trunk volume beneath a trunk cover with the least possible effort in terms of cost, weight, and complexity. Furthermore, crash stability is maintained, despite existing solutions involving numerous subdivisions of the trunk recess, because the forces in an impact are diverted through the longitudinal member structures and the cross member. This can reduce the risk of damage to a fuel tank or a high-voltage battery in a rear-end collision. The trunk recess accounts for the majority of the volume here. In this case, it maximizes the available installation space by opting for a relatively angular shape. To enable this shape and also the depth, the surrounding area is also adapted accordingly.

[0011] The features listed in the dependent claims enable advantageous improvements and further developments of the vehicle body element specified in the independent claim.

[0012] In a preferred embodiment of the invention, at least one of the first and right-hand side walls is embedded between one of the upper longitudinal member structures and the lower longitudinal member structure arranged parallel thereto. This allows for particularly simple fixation of the trunk recess, in particular by welding.

[0013] In a further preferred embodiment of the invention, the side walls of the trunk recess are designed to be higher than the rear wall of the trunk recess. This allows a simple support surface to be formed on the shoulder of the cross member and on the support surfaces of the upper longitudinal members. Furthermore, the depth of the trunk recess can be limited to a level that is easily achievable from a manufacturing perspective, thus enabling cost-effective production of the trunk recess.

[0014] In an advantageous embodiment of the vehicle body element, the trunk recess is designed as a deep-drawn part. The geometry of the trunk recess allows it to be formed as a deep-drawn part particularly easily and cost-effectively. The entire space delimited by the side walls and the rear wall can be used as volume, thereby achieving the maximum geometrically feasible trunk volume. The trunk depth below the loading floor cover results from two components: the portion represented by the trunk recess and the portion generated by the upper longitudinal member structure. This reduces the deep-drawing factor of the recess by a significant amount, which can then be reinvested in the overall depth of the recess. The width of the trunk recess is neither positively nor negatively affected by this concept.This dimension is solely due to the overall design of the vehicle, so that it can be applied to vehicles with different drive concepts. In a preferred embodiment of the invention, the upper longitudinal member structures and the lower longitudinal member structures taper from a vehicle center toward the rear of the vehicle in such a way that a recess is formed for a wheel arranged on a rear axle of a motor vehicle. This makes it easy to create the necessary installation space for the rear wheels of the motor vehicle. Furthermore, the wheel arches can be arranged in the recesses, thus reliably preventing contact between the wheel and the body.

[0015] According to an advantageous embodiment of the vehicle body element, the cross member extends laterally beyond the longitudinal member structures and encloses them from the outside, at least in sections. The cross member has several functions in this structure. Firstly, it provides connection points for the belt fastening and seat attachment points, and secondly, it acts as a crucial bridge for transverse rigidity. In height, the cross member spans several levels, thus laterally supporting the floors and the longitudinal member structure. It also extends into the wheel house area, where the cross member engages the adjacent structure with a form-fitting fit. Another special feature here is that the cross member is located exclusively in the interior, thus reducing the amount of additional sealing required.

[0016] In a further preferred embodiment of the invention, in addition to the cross member, a further cross member is provided for accommodating a high-voltage battery on an underbody structure of the motor vehicle, which cross member is arranged substantially parallel to the first cross member. This allows for further stiffening of the body in the underbody area. This leads to lower mechanical stress on the high-voltage battery and thus reduces the risk of damage to individual battery cells of the high-voltage battery.

[0017] According to a further advantageous embodiment of the vehicle body element, a receiving region is formed on each end of the upper longitudinal member structures facing the rear of the vehicle in order to connect the upper longitudinal member structure to another vehicle structure. This enables particularly simple connection of the vehicle body element to other body components. The connection can be made in particular by screwing the receiving regions or by welding the receiving regions. A further aspect of the invention relates to a motor vehicle with such a vehicle body element for accommodating a trunk recess. The vehicle body structure according to the invention makes it possible to create the largest possible usable volume of the trunk beneath a trunk cover with the least possible effort in terms of cost, weight, and complexity.Furthermore, crash stability is maintained despite existing solutions with numerous compartments in the trunk well, as the forces in an impact are diverted through the longitudinal member structures and the cross member. This can reduce the risk of damage to a fuel tank or high-voltage battery in a rear-end impact.

[0018] In an advantageous embodiment of the motor vehicle, the motor vehicle is designed as an electrically powered motor vehicle with an electric drive motor and a high-voltage battery, wherein the high-voltage battery is arranged in the longitudinal direction of the motor vehicle in front of the cross member of the vehicle body element. Since the installation space in electrically powered motor vehicles is particularly limited due to the high-voltage battery's large installation space requirements, such a solution is particularly advantageous for electrically powered vehicles.

[0019] The various embodiments of the invention mentioned in this application can be advantageously combined with one another, unless otherwise stated in the individual case.

[0020] The invention is explained below in exemplary embodiments with reference to the accompanying drawings. They show:

[0021] Figure 1 shows a motor vehicle according to the invention with an inventive

[0022] Vehicle body element for forming a trunk recess,

[0023] Figure 2 shows a preferred embodiment of an inventive

[0024] Vehicle body element for forming a trunk recess in a view from above,

[0025] Figure 3 shows a vehicle body element according to the invention for forming a

[0026] Trunk recess in a view from behind,

[0027] Figure 4 shows a vehicle body element according to the invention for forming a

[0028] Trunk recess in a side view, Figure 5 shows a vehicle body element according to the invention for forming a

[0029] Trunk recess in another view from above, and

[0030] Figure 6 shows a vehicle body element according to the invention for forming a

[0031] Trunk recess in a view from below.

[0032] Figure 1 shows a motor vehicle 10 according to the invention. The motor vehicle 10 is preferably designed as an electrically powered motor vehicle 10. The motor vehicle 10 has a body 12, which comprises a front end 14, a center section 15, and a rear end 16 with a rear end 17, as well as a roof 18 and an underbody structure 20. The motor vehicle 10 further has at least one door 22 to enable entry into a vehicle interior of the motor vehicle 10. Furthermore, the body 12 has a tailgate 19, through which a trunk 21 of the motor vehicle 10 can be loaded and unloaded.

[0033] The motor vehicle 10 has a front axle 24 and a rear axle 26. Two wheels 27 are arranged on each of the front axles 24 and 26. A high-voltage battery 28 is arranged between the front axle 24 and the rear axle 26. An electric drive motor 80 is provided for propelling the motor vehicle 10. The electric drive motor 80 is arranged at the level of the rear axle 26 and drives the rear axle 26.

[0034] Figure 2 shows a first exemplary embodiment of a vehicle body element 30 according to the invention for accommodating a trunk recess 32 in a top view. The vehicle body element 30 comprises a first upper longitudinal member structure 40, a second upper longitudinal member structure 41 opposite the first upper longitudinal member structure 40, a first lower longitudinal member structure 44 arranged parallel to the first upper longitudinal member structure 40, and a second lower longitudinal member structure 45 arranged parallel to the second upper longitudinal member structure 41. The vehicle body element 30 further comprises a cross member 54, which connects the upper longitudinal member structures 40, 41 and the lower longitudinal member structures 44, 45 to one another, and a trunk recess 32 arranged between the longitudinal member structures 40, 41, 44, 45 and the cross member 54.A rear wall 36 of the trunk recess 32 rests against a shoulder 72 of the cross member 54, a first side wall 34 of the trunk recess 32 rests against the first upper longitudinal member structure 40, and a second side wall 35 of the trunk recess 32 rests against the second upper longitudinal member structure 40. The trunk recess 32 further has a floor wall 38, which delimits the trunk volume downwards toward the roadway. Adjoining a side of the cross member 54 facing away from the trunk recess 32 are a first floor element 62 and a second floor element 64, which form an underbody structure 20 of the motor vehicle 10.

[0035] The vehicle body element 30 is arranged in a rear section 16 of a motor vehicle 10. The objective of the vehicle body element 30 is to create the largest possible usable volume in a trunk segment beneath a trunk cover, in particular beneath a loading floor 60 of the trunk 21. The longitudinal member structures 40, 41, 44, 45 taper in the direction of travel of the motor vehicle 10 and each have a recess 42 on both sides of the motor vehicle 10 to form wheel housings for the rear axle 26 of the motor vehicle and to create space for the wheels 27 of the rear axle 26. At the ends 68, 70 of the upper longitudinal member structures 40, 41 facing the vehicle rear 17, a first receiving region 50 and a second receiving region 52 opposite the first receiving region 50 are formed in order to connect the longitudinal member structures 40, 41 to the further structure of the body 12.

[0036] The trunk recess 32, preferably designed as a deep-drawn part, has a geometrically simple shape that can be manufactured easily and cost-effectively, particularly using a deep-drawing process. The relatively angular shape of the trunk recess 32 ensures optimal use of the installation space. The other components of the vehicle body element 30 are adapted to the shape of the trunk recess 32.

[0037] Figure 3 shows a side sectional view through a vehicle body element 30 of a motor vehicle 10. The sectional view shows that the trunk depth below the cover of the loading floor 60 is made up of two components: the portion represented by the trunk recess 32 and the portion created by the upper longitudinal member structure 40, 41. This significantly reduces the deep-drawing factor of the trunk recess 32, which can be reinvested in the overall depth of the trunk recess 32.

[0038] The width b of the trunk recess 32 is neither positively nor negatively influenced by this concept. This dimension is solely due to the overall design of the motor vehicle 10, so that this concept is also transferable to motor vehicles 10 with an internal combustion engine or hybrid drive structure. As can be seen in Figure 3, the cross member 54 is continued laterally in the wheel house area in a continuation 56, so that the cross member 54 continues the upper longitudinal member structures 40, 41 and the lower longitudinal member structures 44, 45, so that the cross member 54 encloses the longitudinal member structures 40, 41, 44, 45 at least in sections from the outside. Furthermore, it can be seen in the sectional view that the trunk recess 32 is accommodated between the upper longitudinal member structure 40, 41 and the lower longitudinal member structure 44, 45.The upper longitudinal member structure 40, 41 defines an upper floor level of the volume under the loading floor 60 and a landing protection 66 arranged on the underside of the trunk recess 32 defines a lower floor level of the trunk recess 32. The trunk depth h therefore results from the sum of the two components hi + h2, which are contributed by the trunk recess 32 (h2) and the longitudinal member structure 40, 41 (hi).

[0039] Figure 4 shows a side view of the vehicle body element 30 in the area of ​​the rear end 16 of the motor vehicle 10. Further delimiting elements can be seen in a longitudinal section. The overall height h of the trunk recess 32 is defined upwards by the plane of the loading floor 60 and downwards by the limit of the impact protection 66. This is defined by the overall design of the motor vehicle 10. In the longitudinal direction, the rear wall 36 of the trunk recess 32 is defined in the lower area by the installation space of the rear axle 26. In the upper area, the dimension of the cross member 54 regulates the position, with the position of the cross member 54 being influenced by the seating position of the second row of seats. Here, too, the geometric design in the transition from the trunk recess 32 to the cross member area and the second floor element 64 below plays a decisive role.In addition to being lowered compared to the prior art solution (see dashed line), the second floor element 64 also engages the forward-tapering contour of the trunk recess 32, allowing this to further transition into a flat floor of a first floor element 62. In this way, the trunk recess 32 and the two floor elements 62, 64 form a large, closed surface, with height differences determined by the installation space. This floor assembly forms a lateral, longitudinally continuous dividing plane 48 to the longitudinal member structures 40, 41, 44, 45.

[0040] Figure 5 shows a further top view of a vehicle body element 30 according to the invention for forming a trunk recess 32. The cross member 54 has several functions in this structure. Firstly, it provides connection points for the belt fastening and seat connection points, and secondly, it forms a bridge for rigidity in the transverse direction. In height, the cross member 54 bridges several levels (seen in the sectional views) and thus laterally supports the floor elements 50, 52, the longitudinal member structure 40, 41, 44, 45, and also projects into the area of ​​the wheel arches 46, where the cross member 54 engages the next structure in a form-fitting manner. Another special feature here is that the cross member 54 is located exclusively in the interior, thus reducing the amount of additional sealing required.The cross member is continued in the area of ​​the wheel houses 46 in the transverse direction of the motor vehicle 10 in order to enable a connection between the cross member 54 and the longitudinal member structures 40, 41, 44, 45.

[0041] The longitudinal member structures 40, 41, 44, 45 taper in the direction of travel of the motor vehicle 10 and each have a recess 42 on both sides of the motor vehicle 10 to form wheel housings for the rear axle 26 of the motor vehicle and to create space for the wheels 27 of the rear axle 26. At the ends 68, 70 of the upper longitudinal member structures 40, 41 facing the vehicle rear 17, a first receiving region 50 and a second receiving region 52 opposite the first receiving region 50 are formed to connect the longitudinal member structures 40, 41 to the further structure of the body 12. Furthermore, a parting plane 48 is formed on the vehicle body element 30 between the floor elements 62, 64 and the longitudinal member structures 40, 41.

[0042] Figure 6 shows a vehicle body element 30 according to the invention for forming a trunk recess 32 in a bottom view. The vehicle body element 30 additionally has a further cross member 58, which is arranged between the first floor element 62 and the second floor element 64 and serves as a receptacle for a high-voltage battery 28 of an electrically powered motor vehicle 10. The further cross member 58 also increases the transverse rigidity of the vehicle body element 30 and, through four connection points, integrates the high-voltage battery 28 into the vehicle body element 30. Furthermore, Figure 6 shows that the lower longitudinal member structures 44, 45 also have a parting plane 48 to the trunk recess 32 and the floor elements 62, 64. List of Reference Symbols

[0043] motor vehicle

[0044] body

[0045] front end

[0046] Center of vehicle

[0047] Rear carriage

[0048] Rear of vehicle

[0049] Roof

[0050] tailgate

[0051] Subfloor structure

[0052] trunk

[0053] door

[0054] front axle

[0055] rear axle

[0056] wheel

[0057] High-voltage battery

[0058] Vehicle body element

[0059] Trunk recess first side wall second side wall

[0060] back wall

[0061] Floor wall first upper longitudinal member structure second upper longitudinal member structure recess first lower longitudinal member structure second lower longitudinal member structure wheel house parting plane first receiving area second receiving area

[0062] cross member

[0063] Continuation

[0064] Cross member battery structure

[0065] Loading floor first floor element second floor element

[0066] Impact protection underbody structure first end second end

[0067] Sales of electric drive motors

Claims

Patent claims 1. Vehicle body element (30) for receiving a trunk recess (32), comprising a first upper longitudinal member structure (40), a second upper longitudinal member structure (41) opposite the first upper longitudinal member structure (40), a first lower longitudinal member structure (44) arranged parallel to the first upper longitudinal member structure (40), a second lower longitudinal member structure (45) arranged parallel to the second upper longitudinal member structure (41), a cross member (54) which connects the upper longitudinal member structures (40, 41) and the lower longitudinal member structures (44, 45) to one another, and a trunk recess (32) arranged between the upper and lower longitudinal member structures (40, 41, 44, 45) and the cross member (54), wherein a rear wall (36) of the trunk recess (32) is connected to a shoulder (68) of the cross member (54),a first side wall (34) of the trunk recess (32) rests against the first upper longitudinal member structure (40) and a second side wall (35) of the trunk recess (32) rests against the second upper longitudinal member structure (40).

2. Vehicle body element (30) according to claim 1, wherein one of the first and second side walls (34, 35) is embedded between one of the upper longitudinal member structures (40, 41) and the lower longitudinal member structure (44, 45) arranged parallel thereto.

3. Vehicle body element (30) according to claim 1 or 2, wherein the side walls (34, 35) are higher than the rear wall (36).

4. Vehicle body element (30) according to one of claims 1 to 3, wherein the trunk recess (32) is designed as a deep-drawn part.

5. Vehicle body element (30) according to one of claims 1 to 4, wherein the upper longitudinal support structures (40, 41) and the lower longitudinal support structures (44, 45) extend from a vehicle center (15) in the direction of a vehicle rear (17) in such a way taper so that a recess (42, 43) is formed for a wheel (27) arranged on a rear axle (26) of a motor vehicle (10).

6. Vehicle body element (30) according to one of claims 1 to 5, wherein the cross member (54) extends in the lateral direction beyond the longitudinal member structures (40, 41, 44, 45) and encloses them at least in sections from the outside.

7. Vehicle body element (30) according to one of claims 1 to 6, wherein in addition to the cross member (54), a further cross member (58) for receiving a high-voltage battery (28) on an underbody structure (20) of the motor vehicle (10) is provided, which is arranged substantially parallel to the first cross member (54).

8. Vehicle body element (30) according to one of claims 1 to 7, wherein a receiving region (50, 52) is formed on each end (68, 70) of the upper longitudinal member structures (40, 41) facing the vehicle rear (17) in order to connect the upper longitudinal member structure (40, 41) to a further vehicle structure.

9. Motor vehicle (10) according to one of claims 1 to 8, wherein the motor vehicle (10) has a vehicle body element (30) for receiving a trunk recess (32).

10. Motor vehicle (10) according to claim 9, wherein the motor vehicle (10) is designed as an electrically driven motor vehicle (10) with an electric drive motor (80) and a high-voltage battery (28), wherein the high-voltage battery (28) is arranged in the longitudinal direction of the motor vehicle (10) in front of the cross member (54) of the vehicle body element (30).

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