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DE-102023124201-B4 - Safety device for the front area of a motor vehicle

DE102023124201B4DE 102023124201 B4DE102023124201 B4DE 102023124201B4DE-102023124201-B4

Abstract

Safety device (1) for a front area (2) of a motor vehicle (3), comprising at least the following components: - a front hood (4) with a cabin-side end (5) and a front-side end (6); - a shell (7) of the motor vehicle (3); and - a hinge (8) by means of which the front hood (4) is pivotably mounted on the body shell (7), wherein the safety device (1) comprises a pull rope (9) which is connected to the body shell (7) at a first attachment point (10) and to the front hood (4) and/or the hinge (8) at a second attachment point (11), wherein the second attachment point (11) is located at the cabin-side end (5) of the front hood (4) and the first attachment point (10) is offset in relation to the second attachment point (11) towards the front end (6) of the front hood (4), so that in the event of a frontal crash, an impact force transmitted to the front hood (4) can be absorbed by means of the pull cable (9) in order to deflect the cabin-side end (5) of the front hood (4) vertically downwards, characterized by the fact that the hinge (8) has a predetermined bending point (12), and that the predetermined bending point (12) is located on the front side of the second attachment point (11).

Inventors

  • Philipp Bolay

Assignees

  • DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20230908

Claims (9)

  1. Safety device (1) for a front area (2) of a motor vehicle (3), comprising at least the following components: - a front hood (4) with a cabin-side end (5) and a front-side end (6); - a body shell (7) of the motor vehicle (3); and - a hinge (8) by means of which the front hood (4) is pivotably mounted on the body shell (7), wherein the safety device (1) comprises a pull cable (9) which is connected to the body shell (7) at a first attachment point (10) and to the front hood (4) and/or the hinge (8) at a second attachment point (11), wherein the second attachment point (11) is arranged at the cabin-side end (5) of the front hood (4) and the first attachment point (10) is offset with respect to the second attachment point (11) in the direction of the front end (6) of the front hood (4), so that in the event of a frontal crash an impact force transmitted to the front hood (4) can be absorbed by means of the pull cable (9) in order to deflect the cabin-side end (5) of the front hood (4) vertically downwards, characterized in that the hinge (8) has a predetermined bending point (12) exhibits, and that the intended bending point (12) is located on the front side of the second connection point (11).
  2. Safety device (1) according to Claim 1 , wherein the intended kink point (12) is located between the first connection point (10) and the second connection point (11).
  3. Safety device (1) according to one of the preceding claims, wherein the hinge (8) comprises a hinge eye (13) on which the front hood (4) is pivotably mounted.
  4. Safety device (1) according to one of the preceding claims, wherein a first connection point (14) at which the hinge (8) is connected to the front hood (4) is arranged on the cabin side of a second connection point (15) at which the hinge (8) is connected to the body shell (7).
  5. Safety device (1) according to one of the preceding claims, wherein the traction rope (9) is a steel rope or a fiber composite rope.
  6. Safety device (1) according to one of the preceding claims, wherein the front hood (4) is two-layered, in which a first, lower layer of the front hood (4) is profiled, and in which a second, upper layer of the front hood (4) comprises an outer visible surface (16), has a lower stiffness than the first lower layer and is spaced apart from the first lower layer to form a vertical deformation zone for an impacting object.
  7. Motor vehicle (3), comprising at least the following components: - a drive motor (17) for providing a drive torque, - at least one drive wheel which is in torque-transmitting connection with the drive motor (17) in order to provide propulsion of the motor vehicle (3) based on the drive torque; and - a safety device (1) according to any one of the preceding claims.
  8. motor vehicle (3) according to Claim 7 , wherein the motor vehicle (3) comprises a horizontal deformation zone (18) adjoining the body shell (7) at the front.
  9. motor vehicle (3) according to a Claim 7 or Claim 8 , wherein the motor vehicle (3) is a battery electric motor vehicle (3) and the front hood (4) is a cover of a trunk (19) of the motor vehicle (3).

Description

The invention relates to a safety device for a front area of a motor vehicle according to the preamble of claim 1 and to a motor vehicle with such a safety device. In purely electric vehicles, the combustion engine is eliminated from the front of the vehicle. The resulting freed-up space allows for the integration of a trunk into the front. Such a trunk must be sealed against the elements, preventing leaks and water ingress. In industrial practice, this is achieved through a seal, such as a bladder seal, between the trunk well and the hood. The hood therefore features a corresponding sealing flange around its perimeter. DE 10 2010 023 285 A1 Disclosing a motor vehicle body, which comprises a frame, a hood, an actuator extendable from a rest position to raise the hood to a stop position upon contact with a contact surface of the hood, and a front and a rear element, each attached to a mounting point on the frame and a mounting point on the hood, respectively, and held taut in the stop position, limiting the lifting of the hood by the actuator. These elements define an instantaneous center of rotation about which the hood can pivot from the stop position. Pivoting the hood about this instantaneous center of rotation drives the actuator toward its rest position. The actuator is driven by a spring. Both limiting elements are held taut during the actuating of the hood from the stop position. DE 10 2021 130 927 A1 Disclosing a hinge arrangement for attaching a front hood to a stationary body part of a motor vehicle, comprising a lower hinge part attached to the stationary body part and pivotably connected via a pivot point to an upper hinge part attached to the front hood, wherein at least one deformation area of the lower hinge part acting in the vertical direction of the vehicle is provided in the area of the pivot point, wherein the lower hinge part is manufactured in one piece, and wherein a tension strut is provided as a deformation area. EP 0 992 418 A2 reveals a hood which has a hood wall with an upper part and a lower part. DE 10 2004 061 303 B4 reveals a hood with an outer sheet metal forming the outside of the hood and an inner sheet metal made of an aluminum alloy, which covers the inside of the outer sheet metal facing the engine compartment. JP H11 - 34 925 A Disclosing a hinged hood in which the rear end of the hood springs up upon detection of a collision between the front end of a vehicle and an obstacle, wherein this hinged hood has a connecting part on the vehicle body side, which is provided on a highly rigid vehicle body part to secure the interior in the event of a vehicle collision in which the front part of a vehicle is crushed, and has a connecting part on the hood side, which is provided on the hood on a side located behind the connecting part in the longitudinal direction of the vehicle, wherein both the connecting part on the vehicle body side and the connecting part on the hood side are connected to each other by a connecting element. JP H11 - 198 860 A The document discloses a rear structure of a hinged hood that detects a collision between a vehicle and an obstacle and causes the rear of the hood to spring up from the vehicle body. The rear structure of the hinged hood is equipped with a limiting device that restricts the upward movement of the rear corner portion of the hood from the vehicle body, and the limiting device bends the rear corner portion towards the side of the vehicle body when the hood springs up. DE 100 25 784 C1 Disclosure reveals a system for the targeted deformation of a motor vehicle hood cover, comprising a sensor, a modularly constructed hood, and at least one actuator. The sensor detects an impact resulting from a collision and activates the actuator, which deforms the flexible hood cover in such a way that the vertical distance between the flexible hood cover and the vehicle's engine block is increased by a predefinable safety margin. To be approved for road use, motor vehicles in many countries and regions must meet legal requirements regarding the safety of occupants and other road users. Additional requirements include, for example, consumer protection regulations. This concerns, for instance, the safety of other road users in the event of a head impact against the hood of the vehicle. To dissipate the energy of a road user's head in such a collision, and thus to protect the user, the hood and surrounding components are designed to be deformable. The head typically impacts the hood in a largely vertical trajectory. In industrial practice, this results in a head penetration of up to 100 mm. To achieve the necessary deformation range of up to 100 mm, the hinge by which the hood is mounted to the vehicle's body shell must be designed to be flexible in the z-direction, i.e., in the vertical direction. This ensures that there is no stable counter-bearing for the hood in the event of a frontal crash. Legal, consumer protection, and manufacturer-specified safety