JP2018052248A - Vehicle front structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the intrusion of an elbow of a pedestrian into a vehicle side at a collision of the pedestrian to a vehicle front part by a simple constitution.SOLUTION: A hole part 13 as a fragile bend induction part for inducing a bend to a rear part of a front upper cross member 10 is formed at a front position of a radiator 32. By this constitution, when setting the hole part 13 of the front upper cross member 10 which abuts on the radiator 3 as a support point by bending the front upper cross member 10 at the hole part 13 and making it abut on the radiator 3 at a collision of a pedestrian, flexure amounts of a left half and a right half of the front upper cross member up to both ends of the front upper cross member 10 from the support point are largely reduced, a sufficient reaction force can be thus obtained, and the intrusion of an elbow of a pedestrian into a rear part can be suppressed by a simple constitution.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle front structure in which a foot wiping reinforcement located at a height below a knee of a pedestrian and extending in the vehicle width direction of the vehicle is disposed on the rear side of a front bumper.

  2. Description of the Related Art Conventionally, in an automobile, for example, the following is a vehicle front part structure for reducing an impact load on a leg part of a pedestrian that collides in front of the vehicle. That is, the bumper reinforcement of the front bumper is covered with a bumper cover, a movable member with a hinge structure is arranged without protruding downward from the lower end of the bumper cover, and the load support portion provided at the tip of the movable member is usually Is located behind the middle part of the bumper cover, which is the part of the initial collision, and the load support part turns around the hinge part due to the collision of the pedestrian with the bumper cover, and is relative to the middle part of the bumper cover. The load support part is moved forward, and a part of the collision load is supported below the bumper reinforcement by the moved load support part. It increases and reduces the bending moment of a pedestrian's knee (refer patent document 1).

JP 2004-268826 A (paragraphs 0036 to 0042 and FIGS. 1 to 3)

  However, in the vehicle front structure described in Patent Document 1, the load support portion is provided at the tip of the hinge-shaped movable member, and the load support portion is moved forward relative to the intermediate portion of the bumper cover at the time of a pedestrian collision. The movement of the hinge structure increases the area that receives the load from below the pedestrian's knee to the knee joint, and supports a part of the collision load over a wide area of the bumper reinforcement. There is a problem that it is necessary to provide a member in the bumper reinforcement, and the configuration is complicated, the number of parts is increased, and the cost is increased.

  An object of the present invention is to make it possible to suppress the intrusion of a pedestrian's knee into the vehicle side when the pedestrian collides with the front of the vehicle with a simple configuration.

  In order to achieve the above-described object, the vehicle front structure of the present invention is a vehicle in which a foot wiping reinforcement located at a height below the knee of a pedestrian and extending in the vehicle width direction of the vehicle is disposed on the rear side of the front bumper. In the front structure, the front upper cross member is disposed above the foot wiping reinforcement and is disposed at substantially the same height as the knee joint of the pedestrian and extends in the vehicle width direction. A fragile bending inducing portion that is arranged in front of the vehicle structure and induces bending of the front upper cross member backward by an impact caused by a collision of a pedestrian in front of the vehicle, It is formed in the front position of a vehicle structure.

  According to the present invention, stress is concentrated on the bending induction portion of the front upper cross member due to the impact caused by the collision of the pedestrian in front of the vehicle, and the front upper cross member bends from the early stage of the collision in the bending induction portion. The bend inducing portion of the front upper cross member can be bent and brought into contact with the vehicle structure at an early stage of a pedestrian collision, and the front upper cross member with the bend inducing portion in contact with the vehicle structure as a supporting point Entry of the pedestrian into the back of the knee can be suppressed between both ends of the pedestrian.

  At this time, when the bending induction part abutting against the vehicle structure is used as a supporting point, compared to the case where there is no bending induction part and the entire front upper cross member bends backward due to the impact at the time of collision, the supporting point Front upper cross member left half and right half defined by the length from each end of the front upper cross member to the front upper cross member are shorter than the whole front upper cross member, respectively, and the front upper cross member left half and right half As a result, the front upper cross member can prevent the pedestrian from entering the back of the knee at the height of the knee joint of the pedestrian. Combined with the foot-wiping action, the pedestrian leg injury value can be reduced.

1 is a perspective view of an embodiment of a vehicle front structure according to the present invention. It is a disassembled perspective view of the front upper cross member in FIG. (A), (b) is a schematic plan view for demonstrating the behavior of a front upper cross member.

  An embodiment of a vehicle front structure according to the present invention will be described in detail with reference to FIGS. 1 to 3. Note that front and rear and left and right in the present embodiment mean front and rear and left and right as viewed in a seated state on the seat.

  As shown in FIG. 1, left and right side members 1, 1 extending in the front-rear direction of the vehicle and both ends of the front ends of the left and right side members 1, 1 are connected to a front part of a vehicle such as an automobile, and a front bumper (not shown). A foot wiping reinforcement (hereinafter referred to as foot wiping RF) 2 that extends in the vehicle width direction of the vehicle and is located behind the pedestrian's knee, and the left and right side members behind the foot wiping RF 2. Covering the upper part of the engine room formed by the radiator 3 supported by the radiator support disposed on the left side between the front end portions of 1, 1 and 1, and the left and right side members 1, 1 and the radiator support that supports the radiator 3 And a hood 4 disposed on the hood 4.

  As shown in FIG. 1, the lower end of the L-shaped bracket 6 is connected to the front end of the right side member 1, and the right front apron 7 attached to the L-shaped bracket 6 is connected to the right upper member 8. . On the other hand, the lower end of the left front apron 9 is connected to the left side surface of the left side member 1.

  Further, as shown in FIG. 1, left and right ends of a front upper cross member 10 extending in the vehicle width direction are attached to the front side of the left front apron 9 and the L-shaped bracket 6, respectively. It is arranged so as to be located above the foot wiper RF2 and at substantially the same height as the knee joint of the pedestrian.

  As shown in FIG. 2, the front upper cross member 10 includes left and right plate-shaped first members 10a1 and 10a2 each having a corner portion of the left and right rectangular flat plates cut out, and the first members 10a1 and 10a2. The left and right second members 10b1 and 10b2 superimposed on the respective front sides, and the left and right end portions are fitted into the recesses in the vehicle width direction formed on the front sides of the left and right second members 10b1 and 10b2. And a cross member 10c extending in the vehicle width direction.

  The left and right first members 10a1 and 10a2, the left and right second members 10b1 and 10b2, and the cross member 10c are combined to form a front upper cross member 10, and the left and right brackets 11 and 12 The left and right ends are attached to the left front apron 9 and the L-shaped bracket 6.

  Further, as shown in FIG. 1, the front upper cross member 10 is disposed in front of the radiator 3, and the front member of the cross member 10 c constituting the front upper cross member 10 is positioned forward of the pedestrian vehicle. A hole 13 is formed as a fragile bending inducing portion that induces bending of the front upper cross member 10 in the rearward direction due to an impact caused by the collision. The first and second members 10a1 and 10b1 on the left side are arranged extending to a position close to the hole 1313.

  At this time, since the vicinity of the hole 13 serving as the bending inducing portion becomes fragile, the front upper cross member 10 bends backward near the fragile hole 13 when the pedestrian collides with the front of the vehicle. 10 is in contact with the radiator 3, and when the contact point of the front upper cross member 10 with the radiator 3 is defined as a support point by the rigidity of the radiator 3, the front of the length from the support point to both ends of the front upper cross member The left half and right half of the upper cross member are each shorter than the entire front upper cross member, and the bending of the left half and right half of the front upper cross member is greatly reduced. The front upper cross member in the position can suppress the intrusion of the pedestrian behind the knee Kill. Here, the radiator 3 corresponds to a vehicle structure in the present invention.

  Next, the behavior of the front upper cross member 10 when a pedestrian collides with the vehicle front will be described in more detail.

  3A shows a state where there is no collision of a pedestrian in front of the vehicle, and the triangles A and B in FIGS. 3A and 3B indicate the left and right ends of the front upper cross member 10, respectively. The square C imitates a pedestrian's leg. When a pedestrian collides in front of the vehicle from the state shown in FIG. 3A, the cross member 10c of the front upper cross member 10 does not have a fragile bending inducing portion such as the hole 13, and the like in FIG. As shown by the broken line, the front upper cross member 10 is greatly bent due to the impact at the time of the pedestrian collision, so that the pedestrian's knee (C) easily enters the rear of the vehicle, and the foot wiper RF2 is below the pedestrian's knee. Since the leg is wiped forward, the leg part of the pedestrian is easily deformed into a “<” shape at the lower knee part, resulting in a decrease in the pedestrian leg injury value.

  On the other hand, by forming a hole 13 as a fragile bending inducing portion in the front upper cross member 10 at a position in front of the radiator 32, the vicinity of the hole 13 becomes fragile, as shown in FIG. When the pedestrian collides with the front of the vehicle, the front upper cross member 10 bends in the vicinity of the fragile hole 13, and the vicinity of the hole 13 of the front upper cross member 10 contacts the radiator 3, and the rigidity of the radiator 3 When the contact point of the front upper cross member 10 with the radiator 3 is taken as a support point, the front upper cross member left half 10L of the length from the support point to the fixing points A and B at both ends of the front upper cross member 10L Each of the right half portion 10R is shorter than the entire front upper cross member 10.

  Therefore, compared with the case where there is no hole 13 and the left and right first and second members 10a1 and 10b1 do not extend close to the hole 13, the front upper cross member left half 10L and the right half 10R The flexure is greatly reduced and a sufficient reaction force can be obtained, and the intrusion of the pedestrian into the back of the pedestrian can be effectively suppressed. Even if it is paid, it is possible to prevent the leg part of the pedestrian from deforming into a “<” shape at the lower knee part, and to reduce the pedestrian leg injury value.

  Therefore, according to the above-described embodiment, since the hole 13 as the weak bending inducing portion of the front upper cross member 10 is formed at the front position of the radiator 3, the front upper is caused by the impact caused by the collision of the pedestrian with the vehicle forward. The stress concentrates on the hole 13 of the cross member 10 so that the front upper cross member 10 bends in the hole 13 from the early stage of the collision, and the front upper cross member 10 is bent at the hole 13 at the time of a pedestrian collision. 3 can be brought into contact.

  As a result, when the hole 13 of the front upper cross member 10 that is in contact with the radiator 3 is used as a support point, compared to a case where the front upper cross member 10 does not have a bending inducing portion such as the hole 13, the support point The front upper cross member left half 10L and the right half 10R from the left and right ends of the front upper cross member 10 to the right and left ends are shorter than the entire front upper cross member 10, and the front upper cross member left half 10L and right The bending amount of the half portion 10R can be greatly reduced to obtain a sufficient reaction force, and the intrusion of the pedestrian into the back of the pedestrian can be suppressed. Even if the foot is removed, the leg of the pedestrian does not deform into a square shape at the lower part of the knee. Coupled with I, it becomes possible to reduce the walking Shaashi portion injury criteria with a simple structure and.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  In the above-described embodiment, the case where the bending induction portion formed in the front upper cross member 10 is the hole portion 13 has been described. However, the bending induction portion is not limited to the hole portion 13, for example, the thickness of the front upper cross member 10 is set to be one. The bending inducing part may be formed by thinning the part, or a groove or a cutout in place of the hole part 13 may be used.

  Further, in the above-described embodiment, the example in which the vehicle structure is the radiator 3 has been described. However, the vehicle structure is not limited to the radiator 3, but may be a member or the like constituting the vehicle and having rigidity. That's fine.

  Further, in the above-described embodiment, the present invention is applied to a vehicle in which the radiator 3 that is a vehicle structure is disposed on the left side of the engine room. However, a vehicle structure such as a radiator is an engine to which the present invention is applicable. It may be arranged on the right side of the room or in the center.

2 ... Foot payment RF (foot payment reinforcement)
3. Radiator (vehicle structure)
10 ... Front upper cross member 13 ... Hole (bend inducing part)

Claims (1)

In the front structure of the vehicle in which a foot wipe reinforcement located at the height below the knee of the pedestrian and extending in the vehicle width direction of the vehicle is arranged on the rear side of the front bumper,
A front upper cross member that is located above the foot wiping reinforcement and is positioned at substantially the same height as the knee joint of the pedestrian and extending in the vehicle width direction;
The front upper cross member is disposed in front of the vehicle structure,
A fragile bend-inducing portion that induces a bend in the rear of the front upper cross member due to an impact caused by a collision of a pedestrian in the front of the vehicle is formed at a position in front of the vehicle structure of the front upper cross member. A vehicle front structure characterized by that.

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