motor vehicle

Abstract

Motor vehicle comprising at least one longitudinal member (101), one cross member (102) and one crash box (100), wherein the longitudinal member (101) is connected to the cross member (102) via the crash box (100), and wherein the crash box (100) is configured to convert kinetic energy acting on the cross member (102) into deformation work, wherein the crash box (100) has a base body and a first connection area (108), wherein the base body extends from the cross member (102) to the longitudinal member (101), wherein the first connection area (108) extends perpendicularly away from a longitudinal direction of the base body, wherein the first connection area (108) is materially bonded to the longitudinal member (101), wherein the crash box (100) has a fastening section (106) which is force-fit and / or form-fit connected to the longitudinal member (101), characterized in that the crash box (100) has an upper shell (103) and a lower shell (104),wherein the fastening section (106) is integrally formed on both the upper shell (103) and the lower shell (104), wherein the longitudinal beam (101) has a second connection area (109) extending away from the longitudinal beam (101) in the same direction as the first connection area (108) extends away from the base body, wherein the first connection area (108) is metallurgically bonded to the second connection area (109).

Description

The present invention relates to a motor vehicle according to the preamble of claim 1. Motor vehicles equipped with so-called crash boxes are known from the prior art. A crash box is positioned between a longitudinal member of the vehicle and a front cross member. In a frontal collision, the crash box serves to convert kinetic energy into mechanical deformation work. Thus, the crash box is deformed in a frontal collision, thereby converting kinetic energy into mechanical work. From DE 10 2005 021 663 B3, a motor vehicle with a crash box is known, which is pre-mounted to a longitudinal member via a flange. Final assembly on the longitudinal member is carried out via a section engaging in the longitudinal member and a screw. DE 10 2015 113 773 B3 discloses a bumper arrangement for a motor vehicle, comprising a cross member and crash boxes coupled to the cross member, as well as at least one load element receptacle, a sleeve and at least one flange plate, wherein the at least one flange plate is arranged between a crash box and a structural element of the motor vehicle, wherein the sleeve is arranged at least partially on the outside of the vehicle on the at least one flange plate, wherein a support element is arranged on the inside of the vehicle on the load element receptacle and is supported on the structural element. In contrast, the present invention aims to create a motor vehicle in which the crash box is attached more stably to the longitudinal member. This problem is solved by a motor vehicle according to claim 1. Embodiments of the invention are specified in the dependent claims. The vehicle comprises a longitudinal member, a cross member, and a crash box. The longitudinal member is connected to the cross member via the crash box. The crash box is designed to convert kinetic energy acting on the cross member into deformation work. The crash box has a base body and a first connection area. The base body extends from the cross member to the longitudinal member. The first connection area extends perpendicularly from a longitudinal direction of the base body. In this description, the longitudinal direction is understood to be, in particular, the direction in which the vehicle is typically driven without steering input. The first connection area is bonded to the longitudinal member by a material connection. Additionally, the crash box has a mounting section that is connected to the longitudinal member by a force-fit and / or form-fit connection. The crash box is thus connected to the longitudinal beam firstly via a material bond through the initial connection area and secondly via a force-fit and / or form-fit connection through the mounting section. This double connection is particularly stable. Furthermore, the material bond is well-suited to compensating for manufacturing tolerances. The crash box can be connected to the longitudinal beam without any offset relative to the longitudinal direction of the vehicle via a force-fit and / or form-fit connection. This is particularly advantageous if the vehicle collides head-on with a relatively narrow object such as a pole. The force-fit and / or form-fit connection reduces the risk of cracks occurring in such an accident. This relieves stress on the material-bonded connection and increases the robustness of the entire system. The crash box consists of an upper and a lower shell. The mounting section is integrally formed on both the upper and lower shells. This means, in particular, that the mounting section is formed as a single piece with both the upper and lower shells. This increases the stability of the connection. The longitudinal beam has a second connection area that extends away from the longitudinal beam in the same direction as the first connection area extends away from the base body. The first connection area is bonded to the second connection area. This second connection area increases the contact surface between the crash box and the longitudinal beam, thereby increasing the system's stability. According to one embodiment of the invention, the first connection area can extend away from the base body in a vertical direction and perpendicular to a longitudinal direction of the longitudinal member. In the context of this description, the vertical direction is understood to be, in particular, a direction that is vertical during the intended use of the motor vehicle. According to one embodiment of the invention, the crash box can have a central web arranged between the upper shell and the lower shell. The central web can, in particular, be a different component than the upper and lower shells. According to one embodiment of the invention, the fastening section can have a tab with which the fastening section is positively and / or force-fitted to the longitudinal beam. For the purposes of this description, a tab is understood in particular to be a projection with a recess. According to one embodiment of the invention, the fastening section can be attached to the longitudinal beam by means of a screw connection. In particular, it is possible for the tab to be connected to the screw connection. For example, a screw can protrude through the recess in the tab. According to one embodiment of the invention, the screw connection can be arranged in a transverse direction of the motor vehicle. The transverse direction extends horizontally and is perpendicular to the longitudinal direction. According to one embodiment of the invention, the first connection area can be welded to the longitudinal beam. Preferably, the first connection area can be welded to the second connection area. Further advantages of the present invention will become clear from the following description of a preferred embodiment with reference to the accompanying figure. Fig. 1 shows a schematic perspective view of a crash box with a longitudinal beam and a crossbeam according to an embodiment of the invention. The crashbox 100 connects a longitudinal member 101 to a cross member 102. The cross member is located in a front end region of the vehicle. The crashbox has an upper shell 103, a lower shell 104, and a central web 105 arranged between the upper shell 103 and the lower shell 104. Furthermore, the crashbox 100 has a mounting section 106, which is attached to the longitudinal member 101 by means of a screw 107. The mounting section 106 is designed as a tab with a recess. The screw 107 projects through the recess in the transverse direction of the vehicle and thus connects the crashbox 100 to the longitudinal member 101 in a force-fit and form-fit manner. Furthermore, the crashbox 100 has a first connection area 108, which is welded to a second connection area 109 of the longitudinal beam 101. The first connection area 108 projects vertically upwards and downwards from the upper shell 100 and the lower shell 104. The upper shell 100, the lower shell 104, and the central web 105 can form a basic body of the crashbox 100. The second connection area 109 of the longitudinal beam 101 extends in the same direction as the first connection area 108, thus creating a large-area connection section. The combination of the material-bonded connection between the first connection area 108 and the second connection area 109 with the force-fit and form-fit connection between the longitudinal member 101 and the crash box 100 creates a particularly stable system. In the event of a frontal impact of the vehicle against a relatively narrow object such as a pole, the form-fit and force-fit connection reduces the risk of cracking and relieves stress on the welded joint. The risk of the crash box 100 detaching from the longitudinal member 101 is reduced. The welded connection between the first connection area 108 and the second connection area 109 enables a particularly good compensation of manufacturing-related tolerances.

Claims

Motor vehicle comprising at least one longitudinal member (101), one cross member (102) and one crash box (100), wherein the longitudinal member (101) is connected to the cross member (102) via the crash box (100), and wherein the crash box (100) is configured to convert kinetic energy acting on the cross member (102) into deformation work, wherein the crash box (100) has a base body and a first connection area (108), wherein the base body extends from the cross member (102) to the longitudinal member (101), wherein the first connection area (108) extends perpendicularly away from a longitudinal direction of the base body, wherein the first connection area (108) is materially bonded to the longitudinal member (101), wherein the crash box (100) has a fastening section (106) which is force-fit and / or form-fit connected to the longitudinal member (101), characterized in that the crash box (100) has an upper shell (103) and a lower shell (104),wherein the fastening section (106) is integrally formed on both the upper shell (103) and the lower shell (104), wherein the longitudinal beam (101) has a second connection area (109) extending away from the longitudinal beam (101) in the same direction as the first connection area (108) extends away from the base body, wherein the first connection area (108) is metallurgically bonded to the second connection area (109). Motor vehicle according to claim 1, characterized in that the first connection area (108) extends away from the base body in a vertical direction and perpendicular to a longitudinal direction of the longitudinal member (101). Motor vehicle according to one of the preceding claims, characterized in that the crash box (100) has a central web (105) which is arranged between the upper shell (103) and the lower shell (104). Motor vehicle according to one of the preceding claims, characterized in that the fastening section (106) has a tab with which the fastening section (106) is positively and / or force-fit attached to the longitudinal member (101). Motor vehicle according to one of the preceding claims, characterized in that the fastening section (106) is fastened to the longitudinal member (101) by a screw connection. Motor vehicle according to one of the preceding claims, characterized in that the screw connection is arranged in a transverse direction of the motor vehicle. Motor vehicle according to one of the preceding claims, characterized in that the first connection area (108) is welded to the longitudinal member (101).

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