Front structure for vehicle

Abstract

Provided is a front structure for a vehicle capable of ensuring a sufficient stroke at the time of collision from the vehicle front. This front structure comprises: a front bumper 10 disposed on the front side of the vehicle; a bumper reinforcement 20 attached so as to be positioned at the vehicle rear of the front bumper 10; and an inner bumper 30 connected to the bumper reinforcement 20 and positioned on the rear surface side of the front bumper 10. The inner bumper 30 has a connection release part 40 for releasing the connection state with the bumper reinforcement 20 by means of an input load from the vehicle front.

Description

Vehicle front structure

[0001] The present invention relates to a front structure of a vehicle.

[0002] The vehicle front structure described in Patent Document 1 includes a bumper fascia provided at the front of the vehicle, a bumper reinforcement provided at the front end of the front side frame behind the bumper fascia, and a main body that supports a radar device. The bumper reinforcement and the main body are fastened to each other.

[0003] JP 2016-132276 A

[0004] However, with the technology described in Patent Document 1, when a load is applied from the front of the vehicle during a collision, the input load from the front of the vehicle is likely to be concentrated on the highly rigid radar device, etc., and since the bumper reinforcement and the main body that supports the radar device are fastened to each other, there is a risk that the stroke required to absorb energy during a collision from the front of the vehicle may not be sufficiently secured.

[0005] Therefore, the present invention has been made in light of these problems, and its object is to provide a front structure for a vehicle that can sufficiently ensure the stroke necessary to absorb energy in the event of a collision from the front of the vehicle.

[0006] In order to solve the above problem, a vehicle front structure according to one embodiment of the present invention comprises a front bumper arranged at the front side of the vehicle, a bumper reinforcement attached so as to be located rearward of the front bumper, and a main body portion connected to the bumper reinforcement and located on the rear side of the front bumper, and has a disconnection portion that disconnects the main body portion from the reinforcement when an input load is applied from the front of the vehicle.

[0007] According to the present invention, it is possible to ensure a sufficient stroke required for absorbing energy in the event of a collision from the front of the vehicle.

[0008] The present invention relates to a vehicle front structure, and an embodiment thereof.

[0009] An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the drawings are schematic. Therefore, it should be noted that the relationship between thickness and planar dimensions, ratios, etc., differ from the actual relationship between thickness and planar dimensions, and the drawings also include portions where the relationship between dimensions and ratios differ. Furthermore, the embodiments shown below exemplify devices and methods for embodying the technical concept of the present invention, and the technical concept of the present invention does not limit the materials, shapes, structures, arrangements, etc. of component parts to the following embodiments.

[0010] 1, the vehicle front structure of this embodiment includes, in order from the front of the vehicle, a front bumper 10 arranged on the front side of the vehicle, a bumper reinforcement 20 attached to the back surface of the front bumper 10 so as to be located rearward of the front bumper 10, and an inner bumper 30 which is connected to the bumper reinforcement 20, is located rearward of the front bumper 10, and is a main body portion that stiffens the front bumper 10. Here, the vehicle front structure of this embodiment has a connection release portion 40 which releases the connection between the inner bumper 30 and the bumper reinforcement 20 when an input load F is applied from the front of the vehicle.

[0011] 2, in the disconnecting portion 40 of this embodiment, the bumper reinforcement 20 has reinforcement-side support portions 21 that support the inner bumper 30 in the vehicle up-down direction (Z direction). The reinforcement-side support portions 21 are pillar-shaped and extend upward from the upper portion of the bumper reinforcement 20 as a base end, and are provided at two locations that are spaced apart in the vehicle width direction (X direction) and symmetrical in the vehicle width direction with respect to the center of the vehicle. The inner bumper 30 has two main body-side support surfaces 31 that face each of the two reinforcement-side support portions 21 at positions that overlap each other in the vehicle up-down direction.

[0012] In the normal installation state, the rectangular flat surface formed on the upper end of the support pillar projecting upward from the reinforcement-side support portion 21 and the main body-side support surface 31 are configured to be positioned on a single XY plane where they exactly abut in the vehicle vertical direction. The outline arrow in the figure shows an image of the normal installation state being positioned on a single XY plane where they exactly abut in the vehicle vertical direction. As a result, the connection release portion 40 of this embodiment can prevent dead weight sagging when the bumper reinforcement 20 and the inner bumper 30 are attached in the normal installation state. Furthermore, in the normal installation state, when an input load F from the front of the vehicle is applied during a collision, the inner bumper 30 moves rearward on a single XY plane, causing the main body-side support surface 31 to slide rearward, thereby disengaging from the upper surface of the reinforcement-side support portion 21.

[0013] In particular, as shown in Fig. 2, the inner bumper 30 of this embodiment has a space provided on the main body side support surface 31 in the opposite direction to the input load F (toward the passenger compartment). Furthermore, the inner bumper 30 of this embodiment has a weakened portion 33 provided above the vehicle relative to the main body side support surface 31. The weakened portion 33 of this embodiment is a space that opens in a substantially triangular shape on the surface facing the load direction of the input load F. In this embodiment, two weakened portions 33 are provided on each of the two main body side support surfaces 31, one on the left and one on the right of each main body side support surface 31 (four locations in total).

[0014] As shown in Fig. 2, the inner bumper 30 of this embodiment has an upper shielding surface 34 that extends in the vehicle width direction on the upper surface of the inner bumper 30. Rigid parts such as a center lamp (not shown) are disposed on the upper shielding surface 34. As shown in Fig. 3, which is an end view of the Z-Z cross section, the upper shielding surface 34 has a general portion 35 and a thin-walled portion 36 that is thinner than the general portion 35. The thin-walled portion 36 extends in the vehicle width direction.

[0015] Next, the effects of the vehicle front structure of this embodiment will be described. As shown in Figure 1, the vehicle front structure of this embodiment is provided with a decoupling section 40 that releases the connection between the inner bumper 30 and the bumper reinforcement 20 when an input load F is applied from the front of the vehicle. As a result, with the vehicle front structure of this embodiment, the connection between the bumper reinforcement 20 and the inner bumper 30 can be released when an input load F is applied from the front of the vehicle due to an obstacle or the like. Therefore, a sufficient stroke required for absorbing energy in the event of a collision from the front of the vehicle can be secured [Invention 1].

[0016] 2, in the connection release portion 40 of this embodiment, the bumper reinforcement 20 has a reinforcement-side support portion 21 that supports the inner bumper 30 in the vehicle up-down direction (Z direction), and the inner bumper 30 has a main body-side support surface 31 that faces the upper end surface of the reinforcement-side support portion 21 at a position that overlaps the upper end surface of the reinforcement-side support portion 21 in the vehicle up-down direction. As a result, with the vehicle front structure of this embodiment, in response to an input load F from the front of the vehicle during a collision, the inner bumper 30 moves toward the rear of the vehicle and the main body-side support surface 31 comes off the reinforcement-side support portion 21, so that the load during the collision can be effectively absorbed. In addition, when the bumper reinforcement 20 and the inner bumper 30 are attached, sagging due to their own weight during normal times can be prevented [Invention 2].

[0017] Furthermore, in the vehicle front structure of this embodiment, as shown in FIG. 2, the inner bumper 30 has a space provided in the opposite direction to the input load F relative to the main body side support surface 31. Therefore, when the inner bumper 30 moves rearward in response to a load from the front of the vehicle during a collision, the main body side support surface 31 becomes more likely to come off the reinforcement side support part 21, and the load during the collision can be effectively absorbed [Invention 3].

[0018] Furthermore, in the vehicle front structure of this embodiment, as shown in FIG. 2 , the inner bumper 30 has a weak portion 33, which is located at a position above the vehicle from the main body side support surface 31, and which has a lower strength than other portions of the inner bumper 30. The weak portion 33 is located on a surface that faces the load direction F (Y direction). Therefore, by providing the weak portion 33 in the inner bumper 30 itself, the energy absorption effect against the input load F from the front of the vehicle during a collision can be further improved [Invention 4].

[0019] Furthermore, in the vehicle front structure of this embodiment, as shown in FIG. 2, the weak portion 33 is formed by a space, which effectively reduces the area of ​​the rigid structural portion on the surface facing the load direction F with a simple configuration, and is suitable for intentionally weakening the rigidity against the load direction F to make it easier to buckle [Invention 5].

[0020] 3, the vehicle front structure of this embodiment has an upper covering surface 34 that extends in the vehicle width direction on the upper surface of the inner bumper 30, and the upper covering surface 34 has a general portion 35 and a thin-walled portion 36 that is thinner than the general portion 35, and the thin-walled portion 36 extends in the vehicle width direction. As a result, according to the vehicle front structure of this embodiment, rigid parts such as a center lamp are disposed on the upper covering surface 34, which increases the impact value, but by intentionally providing the thin-walled portion 36 on the upper covering surface 34, the cooperation of the thin-walled portion 36 and the fragile portion 33 intentionally weakens the inner bumper 30 at a desired position, making it more susceptible to buckling [Invention 6].

[0021] As described above, the vehicle front structure of this embodiment can ensure a sufficient stroke in the event of a collision from the front of the vehicle. Note that the vehicle front structure according to the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0022] 10 Front bumper 20 Bumper reinforcement 21 Reinforcement side support portion 30 Inner bumper (main body portion) 31 Main body side support surface 32 Reverse direction space 33 Weak portion (space) 34 Upper cover surface 35 General portion 36 Thin portion 40 Connection release portion F Input load from the front of the vehicle

Claims

1. The front bumper is located on the front of the vehicle, A bumper reinforcement is attached to the front bumper so as to be located at the rear of the vehicle, It comprises a main body portion connected to the bumper reinforcement and located on the rear side of the front bumper, It has a coupling release mechanism that releases the connection between the main body and the bumper reinforcement in response to an input load from the front of the vehicle. The aforementioned coupling release part is The bumper reinforcement is provided with a reinforcement-side support portion that supports the main body portion in the vertical direction of the vehicle. The main body is configured by providing a main body side support surface that is positioned to overlap with the reinforcement side support portion in the vertical direction of the vehicle, The main body portion has a weaker portion at a position above the vehicle relative to the main body portion support surface, which has lower strength than other parts of the main body portion. The front structure of a vehicle is characterized in that the vulnerable portion is installed on a surface facing the direction of the load input from the front of the vehicle.

2. The front structure of a vehicle according to claim 1, wherein the main body portion is provided with a space in the direction opposite to the input direction of the input load relative to the support surface on the main body portion side.

3. The front structure of a vehicle according to claim 1, wherein the weak portion is a space.

4. The main body portion is provided with an upper covering that extends in the vehicle width direction on the upper surface of the main body portion. The aforementioned upper covering has a general portion and a thin portion that is thinner than the thickness of the general portion. The front structure of a vehicle according to claim 1, wherein the thin-walled portion extends in the vehicle width direction.