JP2005335509A - Vehicular front body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular front body structure capable of sufficiently demonstrating the original energy absorption performance of a front side member by enhancing the energy absorption efficiency after the folding while folding the front side member at a bend part during a head-on collision. <P>SOLUTION: A long reinforcing member 24 is arranged inside the section of a bend part 10C of a front side member 10. The reinforcing member 24 in the assembled condition is held by an inner wall face of the bend part 10C in a non-contact manner. In the beginning of the collision during a head-on collision, the front side member 10 does not impair the folding by the bend part 10C, and when the folding is advanced and a sectional contraction is formed in the bend part 10C, the sectional contraction is suppressed by the self shape. Further, the bending rigidity is enhanced by providing the reinforcing member 24. The energy absorption efficiency after the folding of the front side member 10 can be enhanced as the synergistic effect thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes a pair of left and right front side members that are disposed on both sides of the front portion of the vehicle with the longitudinal direction of the vehicle as a longitudinal direction and are bent at an intermediate portion in the longitudinal direction when viewed from the side. It is related with the front body structure of the vehicle comprised by this.

In general, a pair of front side members having a longitudinal direction in the vehicle front-rear direction are disposed on both sides of the front portion of the vehicle. The front side member is configured as a long member having a hollow rectangular cross section, and when viewed in a side view, the front side member is bent at an intermediate portion in the longitudinal direction so that a step is formed between the front portion and the rear portion. Therefore, when a collision load of a predetermined value or more is input to the front side member via the front bumper reinforcement at the time of a frontal collision, the front side member is in a deformation mode in which it is bent at the bent portion while being compressed in the vehicle front-rear direction.
Japanese Patent Laid-Open No. 11-342862 JP 2003-335266 A

  However, if the front side member is bent at the bent portion as described above, there is a problem that the energy absorption performance after that is impaired. In other words, once the front side member is bent at the bent portion, the cross-sectional shape of the bent part contracts (the cross-sectional shape is crushed), and the strength against bending of the bent part gradually decreases. . Therefore, the energy absorption performance that the front side member originally has is cut off in the middle, and the front side member cannot fully exhibit the energy absorption performance.

  In order to solve this problem, a reinforcing member may be set in the bent portion of the front side member to increase the strength against bending and to suppress the bending of the bent portion (see the above-mentioned patent document). However, if a long plate-shaped reinforcing member is simply placed in the bent portion, there is a possibility that it will be bent at the front end portion or the rear end portion of the reinforcing member in addition to the bent portion. Another problem arises that becomes unstable.

  On the other hand, it is not preferable to reinforce the bent portion so that the front side member does not break at all or almost because the initial input load on the collision vehicle becomes large at the time of a frontal collision.

  In consideration of the above-mentioned fact, the present invention sufficiently exhibits the energy absorption performance inherent to the front side member by enhancing the energy absorption efficiency after bending while bending the front side member at the bent portion at the time of frontal collision. It is an object to obtain a vehicle front body structure capable of

  The vehicle front body structure according to the first aspect of the present invention is arranged on both sides of the front portion of the vehicle with the longitudinal direction of the vehicle as a longitudinal direction, and further bent at an intermediate portion in the longitudinal direction when viewed from the side. A front body structure of a vehicle that includes a pair of left and right front side members that does not hinder the bending of the front side member at a bent portion when a collision load at the time of a frontal collision is input. In addition, a reinforcing member that suppresses the cross-sectional contraction of the bent portion that occurs during bending by its own shape is provided inside the cross-section of the bent portion of the front side member.

  A vehicle front body structure according to a second aspect of the present invention is the vehicle front body structure according to the first aspect, wherein the reinforcing member is provided with flange-shaped attachment portions at the front end portion and the rear end portion thereof. The reinforcing member is fixed to the front side member by the portion.

  A front body structure for a vehicle according to a third aspect of the present invention is characterized in that, in the second aspect of the invention, the front end portion and the rear end portion of the reinforcing member are chamfered.

  A vehicle front body structure according to a fourth aspect of the present invention is the vehicle front body structure according to the first aspect, wherein the reinforcing member is fixed in a cantilevered state to the front side member on one side in the longitudinal direction, and The other side of the direction is extended in the state which floated along the bending part, It is characterized by the above-mentioned.

A vehicle front body structure according to a fifth aspect of the present invention is the vehicle front body structure according to the first aspect, wherein the reinforcing member includes a first reinforcing member that reinforces the upper bending point of the bent portion and a lower bent portion of the bent portion. Divided into second reinforcing members that reinforce the points;
It is characterized by that.

  A front body structure of a vehicle according to a sixth aspect of the present invention is the vehicle front body structure according to the first aspect, wherein the front end portion of the reinforcing member is fixed to the lower surface of the front side member, and the rear end portion of the reinforcing member is It is fixed to the upper surface of the front side member.

  According to the first aspect of the present invention, at the time of a frontal collision, the collision load at that time is input to the pair of left and right front side members via the front bumper reinforcement. Since the front side member is bent at an intermediate portion in the longitudinal direction when viewed from the side, when a collision load of a predetermined value or more is input, the front side member tends to be bent starting from the bent portion.

  Here, in the present invention, since the reinforcing member for suppressing the cross-sectional contraction of the bent portion that occurs at the time of bending without inhibiting the bending of the front side member is provided in the cross-section inward of the bent portion of the front side member, The front side member can be bent as usual from the bent portion. Therefore, a large load is not generated in the initial stage of bending of the front side member.

  In addition, the front side member is bent at the bent portion, so that a cross-sectional contraction is likely to occur in the bent portion. However, a reinforcing member exists inside the cross-section of the bent portion and resists the cross-sectional contraction of the bent portion due to its own shape. To do. For this reason, the cross-sectional shrinkage | contraction of the bending part of a front side member is suppressed. Furthermore, when the front side member is bent, the reinforcing member itself also exhibits a force that resists bending. As described above, according to the present invention, when the front side member is bent, both the effect of suppressing the cross-sectional shrinkage and the effect of increasing the bending rigidity can be obtained, so that the high energy absorption performance is maintained even after the front side member is bent. can do.

  According to the second aspect of the present invention, the front end portion and the rear end portion of the reinforcing member are provided with flange-like mounting portions, and the reinforcing member is fixed to the front side member by these mounting portions. Therefore, the attachment of the reinforcing member is easy and the attachment state is stable because there are attachment points at the front and rear.

  Further, since the attachment portion is formed in a flange shape and does not have any special strength, the action and effect produced by the invention according to claim 1 due to the provision of the reinforcing member is reduced by the strength of the attachment portion. Such a problem does not occur.

  According to the third aspect of the present invention, since the front end portion and the rear end portion of the reinforcing member are chamfered, it is possible to avoid a sudden change in the axial sectional rigidity of the front side member by providing the reinforcing member. be able to. In other words, it is possible to avoid a drop in the axial rigidity of the front side member including the reinforcing member by dropping the corners of the front end portion and the rear end portion of the reinforcing member. It is possible to prevent the front side member from being bent unexpectedly at the front end position or the rear end position.

  According to the fourth aspect of the present invention, the front side member is fixed to the front side member in a cantilever-supported state on one side in the longitudinal direction, and the opposite side in the longitudinal direction extends in a state of floating along the bent portion. Therefore, an ideal state can be obtained as the reinforcing member. In other words, if the reinforcement member is to pursue both the function of suppressing the cross-section shrinkage of the bent portion and the function of improving the bending strength, it is most ideal to keep the reinforcing member floating in the air inside the cross section of the bent portion. It is. However, in practice, since the reinforcing member must be fixed to the front side member somewhere, such a reinforcing member cannot be obtained in the air. If the front side member is cantilevered and the free end side extends along the bent portion, a state close to that can be obtained.

  In addition, according to the present invention, since the reinforcing member has a structure that is fixed on one side in the longitudinal direction, the attaching operation is easy.

  According to the fifth aspect of the present invention, the reinforcing member is divided into the first reinforcing member that reinforces the upper bending point and the second bending member that reinforces the lower bending point. Since a reinforcing member is used, the degree of deformation of the bent portion of the front side member on the upper bending point side can be adjusted by the cross-sectional shape, size, length, etc. of the first reinforcing member, and the lower bending point The degree of deformation on the side can be adjusted by the cross-sectional shape, size, length, etc. of the second reinforcing member.

  According to the sixth aspect of the present invention, since the reinforcing member is alternately fixed to the bent portion of the front side member at the front end portion and the rear end portion, it is easy to attach the reinforcing member, and the attachment points are provided at the front and rear. The mounting state is stable because of

  As described above, the front body structure of the vehicle according to claim 1 does not hinder the bending of the front side member at the bent portion when the collision load at the time of a frontal collision is input, and the bent portion generated at the time of the bending. A reinforcing member that suppresses the shrinkage of the cross section by its own shape is provided inside the cross section of the bent portion of the front side member, so even if the front side member is bent at the bent portion at the time of a frontal collision, a large load is generated at the beginning of the bending It has an excellent effect that the energy absorption efficiency can be kept high even after it is not bent.

  According to a second aspect of the present invention, there is provided a front body structure for a vehicle according to the first aspect, wherein the reinforcing member is provided with flange-like attachment portions at the front end portion and the rear end portion thereof. Since the reinforcing member is fixed to the front side member by the above, it is possible to facilitate the mounting operation and improve the stability of the mounting state, and further, it is possible to maintain the effect of claim 1 with high accuracy. Has an effect.

  According to a third aspect of the present invention, there is provided a front body structure for a vehicle according to the second aspect of the present invention, wherein the front end portion and the rear end portion of the reinforcing member are chamfered. This has an excellent effect that the member can be prevented from bending unexpectedly.

  A vehicle front body structure according to a fourth aspect of the present invention is the vehicle front body structure according to the first aspect, wherein the reinforcing member is fixed to the front side member in a cantilevered state on one side in the longitudinal direction and is opposite to the longitudinal direction. Since the side is extended along the bent portion, it has an excellent effect that both the cross-section shrinkage suppressing function and the bending strength improving function of the bent portion can be obtained with high accuracy.

  According to a fifth aspect of the present invention, there is provided a vehicle front body structure according to the first aspect, wherein the first reinforcing member for reinforcing the upper bending point of the bending portion and the lower bending point of the bending portion are reinforced. Since the front reinforcing member is divided into the second reinforcing member to be deformed, the deformation mode of the front side member (that is, the front side member is deformed into a substantially Z shape when viewed from the side, but how much the Z shape is changed to a Z shape) This mode has an excellent effect of being able to optimize the tuning in accordance with the vehicle type.

  According to a sixth aspect of the present invention, there is provided a vehicle front body structure according to the first aspect, wherein the front end portion of the reinforcing member is fixed to the lower surface of the front side member, and the rear end portion of the reinforcing member is the front side. Since it is being fixed to the upper surface of a member, it has the outstanding effect that an installation work can be made easy.

  Hereinafter, several embodiments of a vehicle front body structure according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side.

  FIG. 1 is an overall perspective view of a vehicle front body structure according to this embodiment. As shown in this figure, a pair of left and right front side members 10 having a longitudinal direction in the vehicle front-rear direction are disposed on both sides of the front portion of the vehicle. The front side member 10 is formed in a closed cross-sectional structure by spot welding the front side member outer panel 12 and the front side member inner panel 14. The front end portion of the front side member 10 is coupled to a front bumper reinforcement 16 having a closed cross-sectional structure arranged with the vehicle width direction as a longitudinal direction. Depending on the vehicle type, a crash box is formed between the front end portion of the front side member 10 and the front bumper reinforcement 16 and is formed in a substantially cylindrical shape and is subjected to axial compression deformation when a collision load at the time of a frontal collision is input. Is done.

  The front side member 10 described above is bent at an intermediate portion in the longitudinal direction (more specifically, in the vicinity of the position where the dash panel 22 separating the engine room 18 and the cabin 20 is provided). Thereby, the front side member 10 is located at a position lower than the front part 10A on the rear side of the dash panel 22 and the front part 10A located on the front side of the dash panel 22 when viewed in a side view. The rear portion 10B is provided with a bent portion 10C that is diagonally arranged to connect the rear end portion of the front portion 10A and the front end portion of the rear portion 10B, and is formed in a substantially Z shape.

  A long reinforcing member 24 is disposed inside the cross section of the bent portion 10C of the front side member 10 described above, and will be described in detail below.

  FIG. 2 shows a perspective view of the reinforcing member 24. As shown in this figure, the reinforcing member 24 is formed in a substantially rectangular tube shape. The reinforcing member 24 is a cast product using an aluminum alloy. However, the material is not particularly limited, and a steel plate press-molded product, a hard resin molded product, or the like can be used.

  The reinforcing member 24 connects the top wall 24A, the bottom wall 24B, the pair of left and right side walls 24C constituting the outer shell, and the intermediate point of the top wall 24A and the intermediate point of the bottom wall 24B to separate the internal space of the reinforcing member 24. And a partition wall 24D to be formed (divided).

  From the front end portion and the rear end portion of the bottom wall 24 </ b> B of the reinforcing member 24, a front end flange portion 26 and a rear end flange portion as attachment portions that are formed in a tongue shape and extend along the longitudinal direction of the reinforcing member 24. 28 is attached. Bolt insertion holes 30 are formed at the front end portions of the front end flange portion 26 and the rear end flange portion 28, respectively, and the bottom wall 36 of the front side member 10 (see FIG. 3A) is formed by the bolt 32 and the nut 34. It is supposed to be fixed.

  More specifically, as shown in FIG. 3A, the front end flange portion 26 is fixed to the bottom wall 36 near the intermediate position between the upper bending point 38 and the lower bending point 40 of the bending portion 10C. . The rear end flange portion 28 is fixed to the bottom wall 36 at a position shifted from the lower bending point 40 toward the vehicle rear side. In the present embodiment, when the front end flange portion 26 and the rear end flange portion 28 are fixed to the bottom wall 36, the front end flange portion 26 and the rear end flange portion 28 are appropriately bent. A configuration in which the end flange portion 28 is bent may be employed.

  In the state where the reinforcing member 24 is fixed inside the cross section of the bent portion 10C of the front side member 10 as described above, the reinforcing member 24 straddles the lower bending point 40 and is supported in a hollow state. Therefore, in the assembled state, the reinforcing member 24 is held in a non-contact state with respect to the inner wall surface of the front side member 10, and between the outer wall surface of the reinforcing member 24 and the inner wall surface of the front side member 10. A predetermined gap 42 is formed.

  Next, the operation and effect of this embodiment will be described.

  The state shown in FIG. 3A is a normal state of the front side member 10, that is, a state before a frontal collision. When the vehicle collides frontward from this state, the collision load F at that time is input to the front end portions of the pair of left and right front side members 10 via the front bumper reinforcement 16. Therefore, as shown in FIG. 3B, the front portion 10A of the front side member 10 is subjected to axial compression plastic deformation, and energy is absorbed according to the deformation. At this time, since the reinforcing member 24 is hollowly supported inside the cross section of the bent portion 10C of the front side member 10 in the assembled state, the moving stroke of the bent portion 10C is secured by the gap 42. Therefore, the bent portion 10C of the front side member 10 is bent as usual to the vehicle rear side around the lower bent point 40 until the top wall 24A of the reinforcing member 24 interferes with the inner wall surface of the bent portion 10C (in other words, For example, the bent portion 10C is rotationally displaced clockwise around the lower bending point 40).

  Thereafter, as shown in FIG. 3C, axial compression deformation of the front side member 10 proceeds, and a load exceeding the bending strength of the reinforcing member 24 from the lower bending point 40 on the top wall side of the bent portion 10C is applied to the reinforcing member 24. Is input to the top wall 24A, the bent portion 10C is further bent while the reinforcing member 24 is also bent.

  As described above, in the vehicle front body structure according to the present embodiment, the elongated reinforcing member 24 is provided inside the cross section of the bent portion 10C of the front side member 10 so as to be in a hollow support state and in a non-contact state. Therefore, the front side member 10 can be bent at the bent portion 10C as usual without hindering the initial bending of the front side member 10 (the initial movement operation of the bending). Therefore, it is possible to prevent a large load from being generated on the collision partner vehicle at the initial bending of the front side member 10.

  Incidentally, the solid line graph A in FIG. 5 shows the FS characteristic in the case of the present embodiment, and lowers the initial load compared with the FS characteristic of the broken line graph B with normal reinforcement. Has succeeded.

  Further, as shown in FIG. 4, when the front side member 10 is bent at the bent portion 10C, the cross-section contracts into the bent portion 10C (as shown by the two-dot chain line, the wall surface enters the cross-section inward, and the cross-sectional shape is However, the reinforcing member 24 exists inside the cross section of the bent portion 10C and resists the cross-sectional contraction of the bent portion 10C by its own shape. For this reason, the contraction of the cross section of the bent portion 10C of the front side member 10 is suppressed (no further progress). Further, when the front side member 10 is bent, the reinforcing member 24 itself also exerts a force that resists bending. As described above, according to the present embodiment, when the front side member 10 is bent, both the effect of suppressing cross-sectional contraction and the effect of increasing the bending rigidity are obtained. Therefore, even after the front side member 10 is bent, high energy absorption is achieved. The performance can be maintained.

  Incidentally, the two-dot chain line graph C in FIG. 5 shows the FS characteristic when the reinforcing member is not provided. In this case, after the front side member 10 is bent, the load is sharply reduced. In the case of the present embodiment, this point is improved, and a load equivalent to that in the initial stage of the collision can be maintained even after the front side member 10 is bent.

  In summary, according to the front body structure of the vehicle according to the present embodiment, the front side member 10 is bent at the bent portion 10C at the time of a frontal collision, but does not generate a large load at the beginning of bending and energy after bending. Absorption efficiency can be kept high.

  In the vehicle front body structure according to the present embodiment, the front end flange portion 26 and the rear end flange portion 28 are provided as attachment portions at the front end portion and the rear end portion of the reinforcing member 24, and these front end flange portions are provided. Since the reinforcing member 24 is fixed to the bottom wall 36 of the front side member 10 by the 26 and the rear end flange portion 28, the reinforcing member 24 can be easily attached and has attachment points at the front and rear. The mounting state is stable.

  Further, since both the front end flange portion 26 and the rear end flange portion 28 are formed in a flange shape and have no special strength, the energy absorption performance of the front side member 10 described above (that is, the solid line in FIG. 5). There is no problem that the performance shown in the graph A) is deteriorated by the mounting strength of the front end flange portion 26 and the rear end flange portion 28.

  For these reasons, according to the front body structure of the vehicle according to the present embodiment, the mounting operation can be facilitated and the stability of the mounting state can be improved, and the energy absorption performance of the front side member 10 can be improved with high accuracy. Can be maintained.

  Hereinafter, several embodiments different from the above-described embodiment will be described with reference to FIGS. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

  The embodiment shown in FIG. 6 is characterized in that chamfered portions 52 are formed at the front end portion and the rear end portion of the reinforcing member 50, respectively. In addition, since the chamfered portion 52 is provided, the reinforcing member 50 is formed in an isosceles trapezoidal shape in a side view.

  According to the above configuration, since the chamfered portions 52 are provided at the front end portion and the rear end portion of the reinforcing member 50, the axial cross-sectional rigidity of the front side member 10 is abruptly changed (by providing the reinforcing member). It can be avoided. In other words, it is possible to avoid a drop in the axial rigidity of the front side member 10 including the reinforcing member 50 by dropping the corners of the front end portion and the rear end portion like the reinforcing member 50. As a result, it is possible to prevent the front side member 10 from being bent unexpectedly at the front end position or the rear end position of the reinforcing member 50.

  In the embodiment shown in FIG. 7, the reinforcing member 54 is fixed to the bottom wall 36 of the front side member 10 by a bolt 32 and a nut 34 in a cantilevered manner on one side in the longitudinal direction (the rear portion 54A side), and It is characterized in that the opposite side in the longitudinal direction (the front part 54B side) extends in a state of floating along the bent part 10C. The front portion 54B of the reinforcing member 54 is formed in a substantially triangular shape when viewed from the side. An attachment flange portion 56 is integrally formed at the lower end portion of the rear portion 54A of the reinforcing member 54.

  According to the above configuration, the reinforcing member 54 is fixed to the front side member 10 in a cantilevered state on one side in the longitudinal direction (the rear portion 54A side), and the bent side is the opposite side in the longitudinal direction (the front portion 54B side). Since it extends in a floating state along 10C, an ideal state as the reinforcing member 54 can be obtained. In other words, if the reinforcing member 54 is to pursue both the function of suppressing the cross-sectional shrinkage of the bent portion 10C and the function of improving the bending strength, the reinforcing member is left floating in the cross-section of the bent portion 10C. Most ideal. However, in practice, since the reinforcing member must be fixed to the front side member 10 somewhere, such a reinforcing member cannot be obtained in the air. If the member 54 is cantilever-supported by the front side member 10 and the free end side (front portion 54B side) is extended along the bent portion 10C, a state close to that can be obtained. As a result, according to this embodiment, it is possible to accurately obtain both the cross-section shrinkage suppression function and the bending strength improvement function of the bent portion 10C.

  Further, according to the embodiment shown in FIG. 7, since the reinforcing member 54 is fixed on one side in the longitudinal direction (the rear portion 54A side), the mounting operation of the reinforcing member 54 is also assumed (if the nut 34 is welded). There is also a merit that it is extremely easy since it is only necessary to fasten the bolt 32 from the upper side (if it is a nut).

  In the embodiment shown in FIG. 8, the reinforcing member 60 includes a first reinforcing member 62 that reinforces the upper bending point 38 of the bent portion 10C, and a second reinforcing member 64 that reinforces the lower bending point 40 of the bent portion 10C. It is characterized in that it is divided into In other words, in this embodiment, a plurality of reinforcing members 62 and 64 are used.

  According to the above configuration, the reinforcing member 60 is divided into the first reinforcing member 62 that reinforces the upper bending point 38 and the second reinforcing member 64 that reinforces the lower bending point 40. Since the reinforcing members 62 and 64 are used, the degree of deformation of the bent portion 10C of the front side member 10 on the upper bending point 38 side is adjusted by the cross-sectional shape, size, length, etc. of the first reinforcing member 62. The degree of deformation on the lower bending point 40 side can be adjusted by the cross-sectional shape, size, length, etc. of the second reinforcing member 64. As a result, according to this embodiment, the deformation mode of the front side member 10 (that is, the front side member 10 is deformed into a substantially Z shape in a side view, but how much the Z shape is changed to a Z shape). ) Mode) can be optimized according to the vehicle model.

  In the embodiment shown in FIG. 9, the front end portion of the reinforcing member 66 is fixed to the bottom wall 36 of the front side member 10 via the front end flange portion 68, and the rear end portion of the reinforcing member 66 is the rear end flange portion. It is characterized in that it is fixed to the top wall 72 of the front side member 10 via 70.

  According to the above configuration, since the reinforcing member 66 is fixed to the bent portion 10C of the front side member 10 at the front end portion and the rear end portion alternately up and down, the reinforcing member 66 can be easily attached and attached at the front and rear mounting points. The mounting state is stable because of For this reason, it is possible to facilitate the mounting operation.

  In the vehicle front body structure according to the present embodiment described above, the reinforcing member 24 and the like are formed in a quadrangular prism shape in which one partition wall 24D exists, but the present invention is not limited to this, and various shapes are adopted. Is possible. For example, a T-shaped, H-shaped, I-shaped, or the like can be applied in addition to a hollow quadrangular prism shape or an octagonal prism shape having no partition wall.

1 is a perspective view illustrating an overall configuration of a front body structure of a vehicle according to an embodiment. It is a perspective view which shows the reinforcement member shown by FIG. (A) is a side view of the front side member showing the assembled state of the reinforcing member, (B) is a side view of the front side member showing the initial state of the collision, and (C) is a front side member showing the state in the late stage of the collision. It is a side view. It is a longitudinal cross-sectional view (cross-sectional view in alignment with line 4-4 of FIG.3 (C)) of a bending part which shows a mode that the bending part of a front side member shrink | contracts a cross section. FIG. 5 is a diagram illustrating the FS characteristics of the present embodiment in a graph while comparing with other configurations. It is a side view corresponding to Drawing 3 (A) showing the front body structure of the vehicles concerning other embodiments. It is a side view corresponding to Drawing 3 (A) showing the front body structure of vehicles concerning other embodiments similarly. It is a side view corresponding to Drawing 3 (A) showing the front body structure of vehicles concerning other embodiments similarly. It is a side view corresponding to Drawing 3 (A) showing the front body structure of vehicles concerning other embodiments similarly.

Explanation of symbols

10 Front side member 10C Bending part 24 Reinforcing member 26 Front end flange part (mounting part)
28 Rear flange part (mounting part)
38 Upper bending point 40 Lower bending point 50 Reinforcing member 52 Chamfered portion 54 Reinforcing member 54A Rear portion (one side in the longitudinal direction)
54B front (opposite side in the longitudinal direction)
60 reinforcing member 62 first reinforcing member 64 second reinforcing member 66 reinforcing member

Claims (6)

The front and rear direction of the vehicle is disposed on both sides of the front portion of the vehicle, and further includes a pair of long front left and right front side members that are bent at an intermediate portion in the longitudinal direction when viewed from the side. A vehicle front body structure,
Bending of the front side member is a reinforcing member that does not inhibit the bending of the front side member at the bent portion when the collision load at the time of frontal collision is input and suppresses the cross-sectional contraction of the bent portion at the time of bending by its own shape. Provided inside the section of the section,
A vehicle front body structure characterized by that. A flange-shaped attachment portion is provided at the front end portion and the rear end portion of the reinforcement member, and the reinforcement member is fixed to the front side member by these attachment portions.
The vehicle front body structure according to claim 1. The front end and the rear end of the reinforcing member are chamfered.
The vehicle front body structure according to claim 2. The reinforcing member is fixed to the front side member in a cantilevered support state on one side in the longitudinal direction, and extends in a state where the opposite side in the longitudinal direction floats along the bent portion.
The vehicle front body structure according to claim 1. The reinforcing member is divided into a first reinforcing member that reinforces the upper bending point of the bent portion and a second reinforcing member that reinforces the lower bending point of the bent portion.
The vehicle front body structure according to claim 1. The front end portion of the reinforcing member is fixed to the lower surface of the front side member, and the rear end portion of the reinforcing member is fixed to the upper surface of the front side member.
The vehicle front body structure according to claim 1.

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