DE102020006166A1 - Front end of a motor vehicle - Google Patents

Abstract

The invention relates to a front end (1) of a motor vehicle, comprising two longitudinal beams (2) and a baffle plate (3) arranged transversely to the longitudinal beams (2), the baffle plate (3) being connected to both by means of a number of rotatably mounted struts (5) Longitudinal beams (2) is connected, the baffle plate (3) being rigidly attached to a receiving strut (4) which is arranged essentially parallel to the longitudinal beams (2) and is guided and displaceable parallel to the longitudinal beams (2), the struts (5) are rotatably mounted at fastening points to the receiving strut (4) and to the longitudinal beams (2), the motor vehicle being designed as an electric vehicle.

Description

The invention relates to a front end of a motor vehicle according to claim 1.

Electric vehicles require less space in their front end for aggregates than vehicles with combustion engines. The free space can advantageously also be used as a so-called "frunk" (front trunk = trunk under the bonnet). The crash behavior of a purely electric vehicle differs from that of a conventional vehicle with a combustion engine due to the lack of a conventional motor-gearbox unit.

The DE 10 2005 035 997 A1 discloses a front structure for a motor vehicle which has two struts which are arranged inclined to the vehicle longitudinal axis and which support a central region of a front cross member on longitudinal members of a subframe. In the event of an offset frontal collision, the struts do not transmit any forces, while in the event of a frontal wall collision, the struts cause the side members to buckle outwards.

The invention is based on the object of specifying an improved front end of a motor vehicle.

The object is achieved according to the invention by a stem with the features of claim 1.

Advantageous embodiments of the invention are the subject of the subclaims.

According to the invention, a front end of a motor vehicle comprises two longitudinal members and an impact plate arranged transversely to the longitudinal members, the impact plate being connected to both longitudinal members by means of a number of rotatably mounted struts. According to the invention, the baffle plate is rigidly attached to a receiving strut which is arranged essentially parallel to the longitudinal beams and is guided and displaceable parallel to the longitudinal beams, the struts being rotatably mounted at fastening points to the receiving strut and to the longitudinal beams, the motor vehicle being designed as an electric vehicle is.

The reactive structure formed in this way serves to optimize the breakdown of energy and the introduction of forces into the supporting structures of an electric vehicle.

In this way, the crash safety of electric vehicles with a front trunk, so-called "Frunk", is increased. The front trunk is thus available as additional usable space. In addition, the stiffness of the stem increases and thus enables better driving dynamics.

Embodiments of the invention are explained in more detail below with reference to drawings.

• 1 eine schematische Ansicht eines Vorbaus eines Elektrofahrzeugs,
• 2 eine weitere schematische Ansicht des Vorbaus des Elektrofahrzeugs,
• 3 eine schematische Ansicht eines Längsträgers mit einer Kofferraumwanne, und
• 4 eine schematische Detailansicht der Kofferraumwanne.

Show:

• 1 a schematic view of a front end of an electric vehicle,
• 2 another schematic view of the front end of the electric vehicle,
• 3 a schematic view of a side member with a trunk tub, and
• 4th a schematic detailed view of the trunk tub.

Corresponding parts are provided with the same reference symbols in all figures.

The 1 and 2 are schematic views of a porch 1 an electric vehicle comprising two side rails 2 and one across the side members 2 arranged baffle plate 3 attached to a mounting brace 4th is rigidly attached, which is essentially parallel to the longitudinal beams 2 and is arranged in a longitudinal direction X, that is to say essentially parallel to the longitudinal beams 2 , is guided and displaceable.

The aspiration 4th is by means of a number of rotatably mounted struts 5 with both side members 2 connected. In the embodiment shown there are two struts 5 for connection to one of the side members 2 and two struts 5 for connection to the other side member 2 intended. Alternatively, a different number can be provided. The striving 5 are at attachment points to the support strut 4th and to the side members 2 rotatably mounted.

The striving 5 can for example be made of carbon fiber reinforced plastic (CFRP).

In the event of an impact, in particular a frontal impact, the baffle plate 3 , which can for example have a honeycomb structure, and thus also the receiving strut 4th pushed backwards in a longitudinal direction X. Through the pursuit 5 the force introduced is thus laterally in the side members 2 diverted. A direction of force F points mainly outwards. This allows above the through the struts 5 and the intake strut 4th formed reactive structure a front trunk, a so-called "Frunk", can be used. The reactive structure serves as a crash structure.

• 3 ist eine schematische Ansicht eines Längsträgers 2 mit einer Kofferraumwanne 6.
• 4 ist eine schematische Detailansicht der Kofferraumwanne 6.

In addition to this reactive structure, the front trunk can be constructed as follows:

• 3 Figure 4 is a schematic view of a side member 2 with a trunk tub 6th .
• 4th is a schematic detailed view of the trunk liner 6th .

The trunk tub 6th includes an outer tub 6.1 and an inner tub disposed therein 6.2 which can be designed as thermoplastic glass fiber reinforced tubs, for example aramid fiber reinforced or carbon fiber reinforced. Between the tubs 6.1 , 6.2 is a shift 6.3 made of absorbent rigid polymer foam, for example polyurethane foam. The trunk tub 6th is stable at the same time to take luggage and supports and / or stiffens the entire stem 1 without adding much weight. In the event of an impact, the structure can also absorb energy. Furthermore, absorption elements 7th , for example made of thermoplastic honeycomb structures, between the trunk tub 6th and an end wall 8th of the vehicle. The trunk tub 6th can be arranged so that they are on the side rails 2 , in particular at the front bottom with introduction of force into the body structure, is supported, for example by means of a respective one on the trunk tub 6th attached side frame 9 that is on the side member 2 rests and attached to it, for example screwed, can be. The frame 9 can for example be made of CFRP.

In one embodiment, the outer tub 6.1 made of GRP and the inner tub 6.2 be made of CFRP.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed 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 102005035997 A1 [0003]

Claims (10)

Front end (1) of a motor vehicle, comprising two longitudinal beams (2) and an impact plate (3) arranged transversely to the longitudinal beams (2), the impact plate (3) being connected to both longitudinal beams (2) by means of a number of rotatably mounted struts (5) is connected, characterized in that the impact plate (3) is rigidly attached to a receiving strut (4) which is arranged essentially parallel to the longitudinal beams (2) and is guided and displaceable parallel to the longitudinal beams (2), the struts ( 5) are rotatably mounted at fastening points to the receiving strut (4) and to the longitudinal beams (2), the motor vehicle being designed as an electric vehicle. Stem (1) Claim 1 , characterized in that two struts (5) are provided for connection to one of the longitudinal members (2) and two struts (5) are provided for connection to the other longitudinal member (2) Stem (1) Claim 1 or 2 , characterized in that struts (5) can be formed, for example, from carbon fiber reinforced plastic (CFRP) Front structure (1) according to one of the preceding claims, characterized in that a front trunk is formed above a reactive structure formed by the struts (5) and the receiving struts (4). Stem (1) Claim 4 , characterized in that a trunk tub (6) is arranged in the front trunk, which comprises an outer tub (6.1) and an inner tub (6.2) arranged therein, which are designed as thermoplastic glass fiber-reinforced tubs, wherein between the tubs (6.1, 6.2 ) a layer (6.3) of absorbent polymer rigid foam is arranged, the trunk tub (6) being attached to the side rails by means of a respective side frame (9) which is attached to the trunk tub (6) and rests on the longitudinal member (2) and is attached to it (2) is supported. Stem (1) Claim 5 , characterized in that the outer trough (6.1) and / or the inner trough (6.2) are / is designed as aramid fiber-reinforced or carbon fiber-reinforced trough. Stem (1) Claim 5 or 6th , characterized in that the rigid polymer foam is a polyurethane foam. Stem (1) after one of the Claims 5 to 7th , characterized in that absorption elements (7) are arranged between the trunk tub (6) and an end wall (8) of the vehicle. Stem (1) Claim 8 , characterized in that the absorption elements (7) are formed from thermoplastic honeycomb structures. Stem (1) after one of the Claims 5 to 9 , characterized in that the frame (9) is made of CFRP.

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