DE102022102703A1 - Rear structure for a motor vehicle and motor vehicle with such a rear structure - Google Patents

Abstract

The invention relates to a rear structure for a motor vehicle, comprising two side members, a front cross member and a rear cross member. The front cross member and the rear cross member connect the longitudinal members to each other. The rear structure is a one-piece die-cast component. Furthermore, the invention relates to a motor vehicle with such a rear structure.

Description

The present invention relates to a rear structure for a motor vehicle having the features of the preamble of patent claim 1 and a motor vehicle with such a rear structure.

Rear structures for motor vehicles are known in various embodiments from the prior art.

the DE 10 2020 214 105 A1 describes a rear structure for a motor vehicle with two longitudinal members extending in the longitudinal direction of the motor vehicle and two cross members. The cross members extend in the transverse direction of the motor vehicle and connect the side members to one another. For this purpose, the longitudinal beams each comprise a multiplicity of lateral fastening sections, via which the longitudinal beams are connected to the cross beams.

The assembly of the from the DE 10 2020 214 105 A1 The rear structure described is complex due to the large number of lateral attachment sections.

It is therefore the object of the present invention to provide a rear structure for a motor vehicle that requires little assembly work. Furthermore, it is the object of the present invention to provide a motor vehicle with such a rear structure.

According to the invention, this object is achieved by the rear structure having the features of patent claim 1 and the motor vehicle having the features of patent claim 10 .

According to the invention, a rear structure for a motor vehicle is therefore proposed, which comprises two side members, a front cross member and a rear cross member. The front cross member and the rear cross member respectively connect the longitudinal members to each other. The rear structure is a one-piece die-cast component.

The core idea of the invention is therefore to design the rear structure in one piece by means of die casting. There is therefore no assembly effort for the rear structure, in particular for connecting the cross members to the longitudinal members.

The rear structure is part of a body of the motor vehicle, for example.

The side members can be connected, for example at their front end in the longitudinal direction of the motor vehicle, to a rear end of a side sill of the motor vehicle.

In a functional installation state of the rear structure on the motor vehicle, the side members can each border a side skirt at the rear in the longitudinal direction of the motor vehicle.

For example, in a functional installation state of the rear structure on the motor vehicle, the two side members extend at least largely in the longitudinal direction of the motor vehicle and are spaced apart from one another in the transverse direction of the motor vehicle.

When the rear structure is functionally installed on the motor vehicle, the front cross member and the rear cross member can extend in the transverse direction of the motor vehicle. The front cross member and the rear cross member can be spaced apart from one another in the longitudinal direction of the motor vehicle.

A sill of the motor vehicle can be connected to a spring support of the motor vehicle by means of the side members, for example.

In a preferred embodiment, the rear structure according to the invention comprises an extension of the side members.

In a functional installation state of the rear structure on the motor vehicle, the extensions of the side members each border on a relevant one of the side members at the rear in the longitudinal direction of the motor vehicle.

In an exemplary embodiment, the rear structure according to the invention comprises a first recess in which a luggage compartment floor of the motor vehicle can be arranged.

The first recess can be delimited laterally, that is to say in the transverse direction of the motor vehicle, by the side members. In the longitudinal direction of the motor vehicle, the first recess can be delimited at the front by the front cross member and at the rear by the rear cross member. That is, the side members, the front cross member and the rear cross member define the first recess laterally.

The first recess is, for example, at least approximately cuboid.

The first recess can therefore be at least approximately rectangular in a top view.

The first recess is free of connecting webs, for example, which extend from the side members, the front cross member and/or the rear cross member.

In an exemplary embodiment, the rear structure of the invention includes a rear cowl stay.

The rear panel support can extend in the transverse direction of the motor vehicle when the rear structure is functionally installed on the motor vehicle.

The rear panel support can, in particular in the transverse direction of the motor vehicle, adjoin the rear end regions of the extensions of the side members in the longitudinal direction of the motor vehicle. The rear panel support can thus connect the extensions of the side members to one another.

In a preferred embodiment, the rear structure according to the invention comprises a second recess.

The second recess is delimited laterally, for example, by the extensions of the side members. In the longitudinal direction of the motor vehicle at the front, the second recess is delimited, for example, by the rear cross member.

The second recess can be open at the rear, in particular in the longitudinal direction of the motor vehicle.

The extensions of the side members can each have a connecting element at the rear in the longitudinal direction of the motor vehicle, to which a rear panel support of the motor vehicle can be fixed. For example, the rear panel support is not part of the rear structure. The rear panel support can be used to close the second recess at the rear in the longitudinal direction of the motor vehicle.

In a preferred embodiment, the rear structure according to the invention comprises extensions of the side members, which in a functional installation state of the rear structure on the motor vehicle each border on a relevant side member at the rear in the longitudinal direction of the motor vehicle, and a rear panel support. The rear panel support connects the extensions of the side members together. The extensions of the side members, the rear cross member and the rear panel support define a second recess in which a luggage compartment tray of the motor vehicle can be arranged. In the longitudinal direction of the motor vehicle at the rear, the second recess is therefore delimited by the rear panel support, which is part of the rear structure.

In a preferred embodiment, the rear structure according to the invention comprises a rear fairing.

The rear cowl support and the rear cowl may be integrally formed, i.e. together form a single component.

A luggage compartment tray, for example, can be arranged in the second recess, which delimits the interior of the motor vehicle on an underside.

The luggage compartment tub can be in one piece or in several pieces.

The second recess is, for example, at least approximately cuboid.

The second recess can therefore be at least approximately rectangular in a top view.

When the rear structure is functionally installed on the motor vehicle, the second recess can be arranged behind the first recess in the longitudinal direction of the motor vehicle.

The second recess may be free of connecting webs extending from side walls defining the recess, ie from the extensions of the side members, from the rear cross member and/or the rear panel support.

In a functional installation state of the rear structure on the motor vehicle, the rear paneling can adjoin the rear paneling support at the rear in the longitudinal direction of the motor vehicle.

In an exemplary embodiment, the rear structure according to the invention comprises wheel houses, in particular rear wheel houses or at least parts of wheel houses.

In a preferred embodiment, the rear structure according to the invention comprises spring supports. The spring supports each form a connection point to the chassis. In particular, spring struts of the motor vehicle can be attached to the spring supports.

In a preferred embodiment, the rear structure according to the invention is an aluminum die-cast component, i.e. a component made of aluminum by pressing the aluminum in the liquid or pasty state into a preheated mold under high pressure.

In a preferred embodiment, the rear structure according to the invention is numerically structure-optimized, ie computer-simulated by means of a numerical method, in particular with the aim of specific values such as this Stiffness, to improve its acoustic excitation and / or its strength

The rear structure can, for example, be parameter-optimized, shape-optimized and/or topology-optimized.

The parameter optimization relates to the question of which dimensions, direction, arrangement and/or materials, material qualities, in particular structural elements of the rear structure, must have in order to achieve specific target values. Here, individual parameters, such as the cross section of a beam element or the wall thickness of a shell element, are varied.

Shape optimization is performed to achieve specific target values. This is done by adapting the shape of the rear structure, in particular the shape of at least one opening, at least one embossing and/or at least one rib, for example to minimize stress peaks in the structural mechanics of the rear structure. Here, geometric parameters of local areas of the rear structure are deformed in such a way that the stresses are distributed more evenly and stress peaks are thus minimized.

The geometric parameters can include component dimensions, hole and curvature radii and/or position.

The shape optimization can be done using a vertex morphing algorithm.

The topology optimization relates to an optimal material distribution in a given design space, so that the rear structure meets (a) set target value(s) with the least possible use of material or the target values are improved with a fixed amount of material. For this purpose, an adapted framework is worked out from the rear structure by avoiding or redistributing less loaded material in each iteration step. When optimizing the topology, the most material-saving structure is sought among different variants, which at the same time fulfills the target values for the rear structure or has the best target values for a specified amount of material.

Furthermore, the invention relates to a motor vehicle with a rear structure as described above.

The motor vehicle may include a body that includes the rear structure described above.

• 1 eine perspektivische Ansicht einer ersten Heckstruktur nach der Erfindung;
• 2 eine Oberansicht der ersten Heckstruktur nach der Erfindung;
• 3 eine Oberansicht einer zweiten Heckstruktur nach der Erfindung; und
• 4 eine Oberansicht einer dritten Heckstruktur nach der Erfindung.

The invention is explained in more detail below with reference to exemplary embodiments illustrated in the drawing. It shows:

• 1 a perspective view of a first rear structure according to the invention;
• 2 a top view of the first rear structure according to the invention;
• 3 a top view of a second rear structure according to the invention; and
• 4 a top view of a third rear structure according to the invention.

In the 1 and 2 a first rear structure 2 for a motor vehicle according to the invention is shown. The first rear structure 2 is a one-piece die-cast component, comprising two side members 8, a front cross member 10, a rear cross member 12, two front wheel housing sections 14, two rear wheel housing sections 16 and two rear spring supports 18.

In a functional installation state of the first rear structure 2 on the motor vehicle, the two side members 8 extend in the longitudinal direction of the motor vehicle and the front cross member 10 and the rear cross member 12 extend in the transverse direction of the motor vehicle. The front cross member 10 and the rear cross member 12 thus extend orthogonally to the longitudinal members 8.

At a first end, the front cross member 10 and the rear cross member 12 each adjoin a first of the longitudinal members 8 . At the second end, which is opposite the first end in the transverse direction of the motor vehicle, the front cross member 10 and the rear cross member 12 adjoin the second of the longitudinal members 8 .

The front cross member 10, the rear cross member 12 and the side members 8 thus define a first recess 26. As shown in particular in FIG 2 As can be seen, the first recess 26 has an almost rectangular shape when viewed from above, ie when viewed from above.

A luggage compartment floor of the motor vehicle can be arranged in the first recess 26 .

The first recess 26 is open at the top and bottom in the vertical direction of the motor vehicle.

3 shows a second rear structure 4 for a motor vehicle according to the invention. The second rear structure 4 essentially corresponds to that in the 1 and 2 illustrated first rear structure 2. Consequently, only the distinguishing features are explained below. For everyone else Features apply to the above statements regarding the first rear structure 2.

In addition to the two longitudinal members 8, the front cross member 10, the rear cross member 12, the two front wheel housing sections 14, the two rear wheel house sections 16 and the two rear spring supports 18, the second rear structure 4 comprises two extensions 20 of the longitudinal members 8.

The extensions 20 of the side members 8 extend in the longitudinal direction of the motor vehicle and in the longitudinal direction of the motor vehicle adjoin one of the respective side members 8 at the end.

Together with the rear cross member 12, the extensions 20 of the longitudinal members 8 define a second recess 28. A luggage compartment tub, for example, can be arranged in the second recess 28.

The second recess 28 is therefore delimited at the front by the cross member 12 in the longitudinal direction of the motor vehicle and laterally by the longitudinal members 8 in the transverse direction of the motor vehicle. The second recess 28 is open at the rear in the longitudinal direction of the motor vehicle and at the top and bottom in the vertical direction of the motor vehicle.

The second recess 28 is located behind the first recess 26 in the longitudinal direction of the motor vehicle.

The extensions 20 of the side members 8 can each have a connecting element (not shown) at the rear in the longitudinal direction of the motor vehicle. A rear panel support (not shown) of the motor vehicle can be fixed to the connection elements.

In 4 a third rear structure 6 for a motor vehicle according to the invention is shown. The third rear structure 6 essentially corresponds to that in 3 illustrated second rear structure 4. Consequently, only the distinguishing features are explained below. The above statements relating to the second rear structure 4 apply to all other features.

In addition to the two longitudinal members 8, the third rear structure 6 comprises the front cross member 10, the rear cross member 12, the two front wheel housing sections 14, the two rear wheel housing sections 16, the two rear spring supports 18 and the two extensions 20 of the longitudinal members 8 , a rear cowl support 22 and a rear cowl 24.

The rear panel support 22 extends in the transverse direction of the motor vehicle and borders on a rear end of the extensions 20 of the side members 8 in the longitudinal direction of the motor vehicle. The rear panel support 22 thus connects the extensions 20 of the side members 8 to one another and delimits the second recess 28 in the longitudinal direction of the motor vehicle at the rear.

The rear paneling 24 in turn adjoins the rear paneling support 22 at the rear in the longitudinal direction of the motor vehicle.

It is also conceivable that the rear paneling 24 is not part of the third rear structure 6, i.e. not part of the integral component, but is fixed to the rear paneling support 22 via connecting elements.

Reference List

2

first rear structure according to the invention

4

second rear structure according to the invention

6

third tail structure according to the invention

8th

side members

10

front cross member

12

rear cross member

14

front wheel arch section

16

rear wheel arch section

18

rear spring support

20

renewal

22

rear fairing support

24

tail fairing

26

first recess

28

second recess

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102020214105 A1 [0003, 0004]

Claims (10)

Rear structure for a motor vehicle, comprising two side members (8), a front cross member (10) and a rear cross member (12), the front cross member (10) and the rear cross member (12) each connecting the side members (8) to one another, characterized characterized in that the rear structure (2, 4, 6) is a one-piece die-cast component. rear structure claim 1 , characterized in that the rear structure (2, 4, 6) is an aluminum die-cast component. rear structure claim 1 or 2 , characterized in that the longitudinal members (8), the front cross member (10) and the rear cross member (12) define a first recess (26) in which a luggage compartment floor can be arranged. Tail structure according to one of Claims 1 until 3 , characterized by extensions (20) of the side members (8), which in a functional installation state of the rear structure (2, 4, 6) on the motor vehicle each border in the longitudinal direction of the motor vehicle at the rear of a relevant one of the side members (8), the extensions ( 20) the longitudinal member (8) and the rear cross member (12) define a second recess (28) in which a luggage compartment tub of the motor vehicle can be arranged. rear structure claim 4 , characterized in that the extensions (20) of the side members (8) each comprise a connecting element, to which a rear panel support of the motor vehicle can be fixed, which connects the extensions (20) of the side members (8) to one another and by means of which the second recess (28 ) can be limited at the rear in the longitudinal direction of the motor vehicle. Tail structure according to one of Claims 1 until 3 , characterized by extensions of the side members (8), which in a functional installation state of the rear structure (2, 4, 6) on the motor vehicle each border in the longitudinal direction of the motor vehicle at the rear of a relevant one of the side members (8), and a rear panel support (22), which connects the extensions (20) of the side members (8) to one another, the extensions of the side members (8), the rear cross member (12) and the rear panel support (22) defining a second recess (28) in which a luggage compartment tray of the motor vehicle can be arranged is. Tail structure according to one of Claims 1 until 6 , characterized by a rear panel (24), spring supports (18) and/or at least parts of wheel housings (14, 16). Tail structure according to one of Claims 1 until 7 , characterized in that the rear structure (2, 4, 6) is structurally optimized numerically. Tail structure according to one of Claims 1 until 8th , characterized in that the rear structure (2, 4, 6) is shape-optimized, parameter-optimized and/or topology-optimized. Motor vehicle, characterized by a rear structure (2, 4, 6) according to one of Claims 1 until 9 .

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