Electrically driven motor vehicle having a drive battery in

Abstract

The invention relates to an electrically driven motor vehicle having a drive battery in the region of the underbody of the motor vehicle, said drive battery being mounted together with a left torsion bar and / or a right torsion bar in a rear drive battery fastening region on a left rear side member and / or a right rear side member, in particular by means of a respective screw connection.

Description

Technical Field

[0001] The invention relates to an electrically driven motor vehicle having a drive battery in the region of the motor vehicle underbody. Background Art

[0002] DE 10 2016 212 297 A1 discloses a motor vehicle having an energy storage device, which is arranged on the floor of the vehicle body. A V-shaped reinforcement bar is arranged at the rear of the vehicle. The reinforcement bar is connected to the frame of the energy storage device in the front region. In addition, the reinforcement bar is connected to a crossbeam in the rear region via a bracket, which in turn is connected to a rear longitudinal beam. Summary of the invention

[0003] The object of the present invention is to provide an electrically driven motor vehicle with a drive battery in the region of the floor, wherein the assembly of the motor vehicle is simplified while at the same time providing sufficient rigidity to the motor vehicle.

[0004] This object is achieved by an electrically driven motor vehicle having a drive battery in the area of ​​the floor having the features of claim 1 .

[0005] According to the invention, the electrically driven motor vehicle has a drive battery in the area of ​​the motor vehicle floor, which is mounted together with the left and right torsion bars, ie, jointly on the left and / or right rear longitudinal beams, at the rear drive battery fastening area.

[0006] By mounting the torsion bar together on the corresponding rear longitudinal beam, the manufacture of the motor vehicle is simplified, thereby also simplifying the structural design of the motor vehicle.

[0007] The motor vehicle is preferably a sedan, which in particular has a front, a rear and a passenger compartment between the front and rear. The motor vehicle can be a purely electrically driven vehicle or can also additionally have other drive devices, such as an internal combustion engine or a fuel cell for generating electrical energy.

[0008] Advantageously, the left torsion bar is connected to the left rear longitudinal member together with the drive battery at the drive battery fastening region by means of a single screw connection, and the right torsion bar is connected to the left rear longitudinal member together with the drive battery at the drive battery fastening region by means of a single screw connection.

[0009] The rear longitudinal member can be a body rear longitudinal member and / or a rear longitudinal member which in particular extends beyond a rear axle of the motor vehicle or a side sill of the motor vehicle.

[0010] The drive battery is preferably mounted on the underside of the vehicle floor, wherein the drive battery is arranged below the passenger compartment of the motor vehicle, between the side sills and the front and rear of the motor vehicle. The drive battery can extend substantially over the entire width of the bottom.

[0011] According to a preferred embodiment, the left torsion bar and the right torsion bar are each connected to a rear axle carrier of the motor vehicle.

[0012] The rigidity of the rear end of the motor vehicle is thereby further improved.

[0013] Preferably, the left and right torsion bars are indirectly or directly connected to a left-hand, in particular front, body-fastening section and / or a right-hand, in particular front, body-fastening section of the rear axle carrier.

[0014] The connection to the front body-fixed section of the rear axle carrier is particularly rigid.

[0015] Advantageously, the left and right torsion bars are connected to the vehicle body fixing section of the rear axle support via a left additional bracket element and / or a right additional bracket element, for example, formed of a profiled sheet metal or a casting. The additional bracket element is especially basically used as a push rod and, for example, extends transversely to the corresponding torsion bar.

[0016] As a result, there is no need for the torsion bar to intersect a connection point on the body-fixed section of the rear axle carrier.

[0017] According to a preferred extension, the left torsion bar and the right torsion bar extend backwards, especially in a V-shaped manner, towards each other. In addition, the torsion bars are connected to each other in the real or virtual intersection of the torsion bars. The torsion bars are especially implemented in a straight, i.e. non-bent, tortuous or similar form along their longitudinal extension.

[0018] Preferably, described torsion bar is connected to each other in the zone of the real or imaginary intersection of two bars below the rear axle support.In addition, other torsion bar is connected in the zone of the real or imaginary intersection and is connected with the rear end and / or the rear axle support.

[0019] The torsion bar preferably has an open profile, in particular composed of a single-shell formed metal sheet or an extruded profile. Alternatively or additionally, the torsion bar has a closed hollow profile, in particular made of a double-shell metal sheet or an extruded profile.

[0020] Advantageously, at least the front end section of the torsion bar has an open profile. The front end section comprises, in particular, a fastening point on the drive battery and / or on the rear axle carrier.

[0021] As a result, the ground clearance of the motor vehicle is less affected by the fastening point, for example in the form of a screw connection.

[0022] The rear end section of the torsion bar can have a closed hollow profile.

[0023] As a result, the torsion bar can be designed to be more rigid and / or lighter in this region.

[0024] The rear drive battery fastening region can be designed as a cast part, in particular an aluminum or steel cast part, or as a forged part.

[0025] The cast or forged part can have an improved function with regard to crash resistance and rigidity and can reduce the weight and the required installation space.

[0026] The above-mentioned features can be combined with one another as desired and as sensible as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] A brief description of the accompanying drawings is as follows:

[0028] Figure 1 is a partial cross-sectional view of a portion of a motor vehicle according to an embodiment of the present invention;

[0029] Figure 2 It is a bottom view of the rear part of the motor vehicle as seen from below. DETAILED DESCRIPTION

[0030] Refer to the following Figure 1 and Figure 2 An embodiment of the invention is described. An electrically driven motor vehicle, in particular a passenger car, has a drive battery 3 which is arranged in the area of ​​the motor vehicle floor below the passenger compartment between the front axle, the rear axle and the two side sills. The drive battery is mounted on the body of the motor vehicle from below. Figure 1 The rear region, including the entire rear end of the motor vehicle, is shown in a bottom view from below. Only the rear part of the drive battery 3 is shown here with its rear drive battery fastening areas 31 and 32. In addition, the rear axle 21 with the rear axle support 5 is shown. A rod assembly for stiffening the rear end is located below the rear axle 21 and the rear axle support 5. In particular, the rod assembly has a left torsion bar 7 and a right torsion bar 8, which extend from front to rear in a V-shaped manner toward each other and intersect in the area below and behind the rear axle 21 and are connected to each other via brackets and / or connecting elements 13.

[0031] The left torsion bar 7 and the right torsion bar 8 are connected to the drive battery fastening area 31 and / or 32 at the front in the direction of travel.

[0032] In addition, if Figure 1 It can be seen from the cross-sectional view that the left torsion bar 7 is mounted on the left rear longitudinal beam 9 of the vehicle body together with the left drive battery fixing area 31 through a single bolt 15. Similarly, the right torsion bar 8 is mounted on the right rear longitudinal beam 10 of the vehicle body together with the right drive battery fixing area 32 through a single bolt 16. According to this embodiment, the left rear longitudinal beam 9 and the right rear longitudinal beam 10 are implemented as castings, but can also be composed of a metal sheet shell.

[0033] The drive battery fastening regions 31, 32 are forgings or castings with corresponding through-holes / through-holes for screw connections at the rear corners of the drive battery 3. The drive battery fastening regions 31, 32 are fixed components of the drive battery and / or the drive battery housing.

[0034] like Figure 1 As shown, the torsion bars 7, 8 are also indirectly connected to the left body fastening section 51 and / or the right body fastening section 52 of the rear axle carrier 5. The body fastening sections 51, 52 are in turn connected to the left rear longitudinal beam 9 and / or the right rear longitudinal beam 10. In particular, the left torsion bar 7 is connected, i.e. screwed, to the left body fastening section 51 via the left additional bracket element 11, which essentially acts as a push rod, and the right torsion bar 8 is connected, i.e. screwed, to the right body fastening section 52 of the rear axle carrier 5 via the right additional bracket element 12, which essentially acts as a push rod. The additional bracket elements 11, 12 are formed by sheet metal shells.

[0035] The torsion bars 7, 8 are designed in the form of profiled metal sheets with open profiles in their front end sections 71, 81 (i.e. the sections connected to the drive battery 3 and / or the drive battery fastening areas 31, 32 and the additional support elements 11 and / or 12). As a result, the structural height of the torsion bars 7, 8 is reduced, especially in the area of ​​the screw connections 15, 16, which has a positive effect on the ground clearance of the motor vehicle. In the rear sections 73, 83, the torsion bars 7, 8 are formed by hollow profiles, which are connected to the profiled metal sheets in a suitable material-locking manner, for example by welding or adhesive bonding. The connection of the front end sections 71 and / or 81 to the rear end sections 73 and / or 83 is located behind the connection to the additional support element.

[0036] The rod assembly also has additional rods, such as Figure 2 As shown, these further rods are also connected to the bracket and / or connecting element 13. The central torsion bars 17, 18 extending essentially in the vehicle transverse direction (y direction) are each connected to a rear body-fixed section of the rear axle carrier 5. The rear torsion bars 19, 20 are arranged in a V-shaped manner in the opposite direction to the front torsion bars 7, 8 and are connected to a rear section of the left rear longitudinal beam 9 and / or the right rear longitudinal beam 10.

[0037] Overall, this exemplary embodiment results in a sufficiently rigid rear end which is simplified in terms of production and construction, since the front torsion bars 7 , 8 together with the drive battery 3 are each screwed to the vehicle body, ie the rear longitudinal beams 9 , 10 , via a single screw connection 15 , 16 .

Claims

1. An electrically driven motor vehicle having a drive battery (3) in the region of the underbody of the motor vehicle, wherein: The drive battery (3) is mounted on the rear drive battery fixing area (31, 32) together with the left torsion bar (7) and / or the right torsion bar (8), in particular by means of a (single) bolt connection (15, 16) on the left rear longitudinal beam (9) and / or the right rear longitudinal beam (10).

2. The electrically driven motor vehicle according to claim 1, wherein: The left torsion bar (7) and the right torsion bar (8) are respectively connected to the rear axle bracket (5).

3. The electrically driven motor vehicle according to claim 2, wherein: The left torsion bar (7) and the right torsion bar (8) are indirectly or directly connected to a left, in particular front, body-fixing section (51) and / or a right, in particular front, body-fixing section (52) of the rear axle carrier (5).

4. The electrically driven motor vehicle according to claim 2 or 3, wherein: The left torsion bar (7) and the right torsion bar (8) are connected to corresponding vehicle body fastening sections (51, 52) of the rear axle bracket (5) via a left additional bracket element (11) and / or a right additional bracket element (12).

5. The electrically driven motor vehicle according to any one of claims 1 to 4, wherein: The left torsion bar (7) and the right torsion bar (8) extend rearwardly, in particular in a V-shape, towards each other and are connected to each other in the region below the rear axle carrier (5).

6. The electrically driven motor vehicle according to any one of claims 1 to 5, wherein: The rear drive battery fastening region (31, 32) is designed as a cast part, in particular an aluminum cast part or a steel cast part, or as a forged part.

7. The electrically driven motor vehicle according to any one of claims 1 to 5, wherein: The torsion bars (7, 8) have an open profile, in particular consisting of a single-shell formed sheet metal or an extruded profile, and / or have a closed hollow profile, in particular consisting of a double-shell sheet metal or an extruded profile.

8. The electrically driven motor vehicle according to claim 7, wherein: The front section of the torsion bar (7, 8) has an open profile and the rear section of the torsion bar (7, 8) has a closed hollow profile.

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