JP2020082756A - Vehicle front structure - Google Patents

Abstract

To decrease deformation volume of a passenger compartment by controlling a breakdown position and a breakdown order of a bumper RF when colliding with a center pole.SOLUTION: A vehicle front structure comprises: a pair of right and left front side members 10; a power unit 30; a dash part 40; a rear support part (gear box 44); and bumper RF20. The gear box 44 is installed in an area between the dash part 40 and the power unit 30, and supports a right side device 30R or a left side device 30L when the power unit 30 moves to the vehicle rear side. The bumper RF20 comprises: a center part 20B installed at the center part in the vehicle width direction; a left side part 20A with a plurality of through holes 20A1, which is installed at the same side as the right side device 30R or the left side device 30L supported by the gear box 44 with respect to the vehicle width direction center; and a right side part 20C with a plurality of through holes 20C1, which has a higher bending yield strength than that of the left side part 20A.SELECTED DRAWING: Figure 3

Description

The present invention relates to a vehicle front structure.

In Patent Document 1, in order to prevent the bumper reinforcement (hereinafter, referred to as bumper RF) from being broken at the time of so-called center pole collision and minute lap collision, the vehicle width direction central portion and the vehicle width direction both end portions of the bumper RF are proximate. Discloses a structure in which a center bulk and a side bulk are respectively arranged. Here, the center pole collision is a case where a columnar object collides with the front surface in the vicinity of the center of the vehicle in the vehicle width direction, and the minute lap collision is that the end portion of the vehicle in the vehicle width direction slightly overlaps with the colliding object. This is a case where a frontal collision occurs in a state.

JP, 2005-147437, A

By the way, in the above technique, when the center pole collides, the bumper RF may be broken at a position between the center bulk and the right side bulk or between the center bulk and the left side bulk. Here, the above technique does not control the order of which of the left and right positions is folded first.

However, the structure of the power unit behind the bumper RF and the dash part further behind is not symmetrical, and depending on the structure, it is possible to reduce the amount of deformation of the passenger compartment by controlling the folding position and the order of folding. There is. Therefore, there is room for improvement in this technique in this respect.

It is an object of the present invention to provide a vehicle front structure that reduces the amount of deformation of the passenger compartment by controlling the bending position and the order of bending of the bumper RF at the time of a center pole collision.

The vehicle front structure according to claim 1 is disposed between both left and right front side members, which are disposed on both sides of the vehicle front portion and extend along the vehicle front-rear direction, and between the left and right front side members. And a power unit configured by connecting a right side device forming a right side portion and a left side device forming a left side portion to each other, a dash portion located behind the power unit in a vehicle and in front of a passenger compartment, and the dash. And a rear support portion that is provided in an area between the power unit and the power unit and that supports the right side device or the left side device of the power unit when the power unit moves rearward of the vehicle, and extends along the vehicle width direction. In addition, the front ends of the pair of left and right front side members are connected to each other, and the central portion is provided in the central portion in the vehicle width direction and is set to have a higher bending resistance than the other portions, and A first low yield strength portion provided on the same side as the right side device or the left side device and provided with a plurality of through holes supported by a rear support portion, and supported by the rear support portion with respect to the center in the vehicle width direction. A bumper reinforcement having a second low proof stress portion having a plurality of through holes provided on the opposite side of the right side device or the left side device and having a bending proof stress higher than that of the first low proof stress part, and , Is provided.

In the vehicle front structure according to the first aspect, the pair of left and right front side members are arranged on both sides of the vehicle front, and extend along the vehicle front-rear direction. Further, a power unit including a right-side device and a left-side device connected to each other is arranged between the pair of left and right front side members. The rear support portion is provided in the area between the dash portion behind the power unit and the power unit.If the power unit moves rearward of the vehicle, the right side device or the left side device of the power unit is supported by the rear support portion. It A bumper RF extends along the vehicle width direction and connects the front ends of the pair of left and right front side members.

At the center portion of the bumper RF in the vehicle width direction, there is provided a center portion having a higher bending resistance than other portions. In addition, a first low yield strength part having a plurality of through holes is provided on the same side as the right side device or the left side device supported by the rear support part with respect to the center in the vehicle width direction. Then, a plurality of through holes are provided on the side opposite to the right side device or the left side device supported by the rear support portion with respect to the center in the vehicle width direction, that is, on the side opposite to the first low proof stress portion, and the first low proof stress portion is provided. A second low proof stress portion having a high bending proof strength is provided.

Here, if the second low proof stress portion on the opposite side of the right side device or the left side device supported by the rear support portion folds before the first low proof stress portion, the second low resistance device of the right side device or the left side device is broken. Since the device for transmitting the collision load from the folding start portion of the load bearing portion is different from the device supported by the rear support portion, the shear input at the connecting portion between the left side device and the right side device becomes large. Then, the connection between the left-side device and the right-side device is released (in other words, the power unit is cracked), and only the device that receives the collision load from the folding starting point of the second low withstand strength portion moves to the vehicle interior side, The load may be locally transmitted to the dash portion, and the deformation amount of the dash portion may increase.

Therefore, in this vehicle front structure, the bending resistance of each portion of the bumper RF is increased in the order of the first low proof stress portion, the second low proof stress portion, and the central portion. A plurality of through holes are provided in the section. As a result, when the center pole collides, the first low proof stress portion is set to be broken first, and then the second low proof stress portion is set to be broken. Further, since the position of the first low proof stress portion is set on the same side as the right side device or the left side device supported by the rear support portion with respect to the center in the vehicle width direction, the first low proof stress portion of the first low proof stress portion will be The folding start portion is set so as to transmit the collision load to the device on the side supported by the rear support part of the right side device and the left side device.

In other words, the device supported by the rear support part and the device for transmitting the collision load at the folding start point of the first low-proof strength part that is folded first are the same device, so that the connecting part of the right side device and the left side device is connected. The shear input generated does not increase. As a result, cracking of the power unit is suppressed.

Further, the cracking of the power unit is suppressed, so that the reaction force from the power unit to the bumper RF at the folding start point portion of the first low proof stress portion increases. Therefore, the bumper RF is likely to be broken at the second low yield strength portion. When a break occurs in the second low strength portion, the power unit is pushed rearward of the vehicle in the range between the bending start portion of the first low strength portion and the bending start portion of the second low strength portion of the bumper RF, which results in a collision load. Can be distributed in the vehicle width direction. As a result, local input to the dash portion can be suppressed, and thus deformation of the vehicle interior can be suppressed.

As described above, according to the present invention, the deformation amount of the vehicle interior can be reduced by controlling the folding position and the order of folding of the bumper RF at the time of a center pole collision.

It is a typical top view showing the vehicle front part structure of this embodiment. FIG. 2 is a schematic plan view showing a moment when a center pole collision occurs in the vehicle front structure shown in FIG. 1 and a bumper RF is broken at a first low withstand strength portion. FIG. 3 is a schematic plan view showing a moment when the bumper RF is broken at a second low proof stress portion in the vehicle front structure shown in FIGS. 1 and 2. FIG. 4 is a schematic plan view showing how the bumper RF pushes the power unit in the vehicle front structure shown in FIGS. 1 to 3. It is a front view which shows bumper RF from the vehicle front. FIG. 6A is a sectional view taken along line 6A-6A in FIG. FIG. 6B is a sectional view taken along line 6B-6B in FIG. FIG. 6C is a sectional view taken along line 6C-6C of FIG. FIG. 6 is a schematic plan view showing a vehicle front structure according to a comparative example.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

In addition, arrow FR, arrow UP, and arrow LH, which are appropriately described in the respective drawings, indicate the front direction, the upward direction, and the left side of the vehicle, respectively. Further, in the following description, when front, rear, left, right, and up and down directions are used, the front and rear in the vehicle front and rear direction, the left and right in the vehicle width direction, and the up and down in the vehicle up and down direction are indicated.

As shown in FIG. 1, the vehicle front structure of the present embodiment includes a pair of left and right front side members 10 arranged on both sides of the vehicle front. The front side member 10 is a vehicle body frame member whose longitudinal direction is directed in the vehicle front-rear direction, and is provided symmetrically with respect to the vehicle width direction center line of the vehicle.

The front end portion of the front side member 10 is a deformation portion 12. The deformable portion 12 has lower compressive strength than the main body portion 14 (a portion of the front side member 10 other than the deformable portion 12) against a load in the vehicle front-rear direction. As the deformable portion 12, for example, a crush box made of aluminum or fiber reinforced plastic is exemplified.

Further, the vehicle front structure includes a bumper RF20. The bumper RF 20 is a vehicle body frame member that extends along the vehicle width direction, and connects the front ends of the pair of left and right front side members 10 to each other. Specifically, the front ends of the deformable portions 12 of the pair of left and right front side members 10 are joined to the rear surface of the bumper RF 20. Although the bumper RF20 that linearly extends in the vehicle width direction is schematically illustrated, the bumper RF20 has a shape in which both sides in the vehicle width direction are obliquely bent toward the vehicle rear side, that is, the vehicle front as a whole. It may have an arcuate shape that is convex toward the side. A more detailed configuration of the bumper RF20 will be described later.

Further, the vehicle front portion structure includes a power unit 30 disposed between the pair of left and right front side members 10 and at the vehicle rear side of the bumper RF 20. The power unit 30 is configured by connecting a transaxle 30L as a “left side device” and an engine 30R as a “right side device” to each other. The power unit 30 is supported by the body portions 14 of the pair of left and right front side members 10 via left and right engine mounts 32. Although not shown, the power unit 30 is also supported from below the vehicle at the transaxle 30L. In addition, the width dimension of the engine 30R is larger than the width dimension of the transaxle 30L, and the connecting portion 34 is located leftward of the center in the vehicle width direction.

Further, the vehicle front structure includes a dash portion 40. The dash portion 40 is a portion that separates a space (engine compartment) in which the power unit 30 is arranged from a vehicle compartment (not shown). That is, the dash portion 40 constitutes the front end of the vehicle compartment. The dash section 40 includes a dash panel 42 and a dash cloth (not shown). The dash panel 42 is joined to the rear ends of the pair of left and right front side members 10. A kick-up portion (not shown) may be provided on the vehicle rear side of the front side member 10, and the dash panel 42 may be disposed above the kick-up portion.

A gear box 44 is provided in front of the dash panel 42, and the gear box 44 is arranged so as to project toward the vehicle front side with respect to the dash panel 42. Therefore, in this embodiment, if the power unit 30 moves rearward of the vehicle (for example, if it moves in parallel), the gear box 44 supports the power unit 30. That is, in the present embodiment, the gear box 44 corresponds to the “rear support portion” of the present invention. The gear box 44 is arranged at a position displaced to the left with respect to the center in the vehicle width direction and at a position behind the transaxle 30L.

Next, a detailed configuration of the bumper RF 20 will be described with reference to FIGS. 5 to 6C.

FIG. 5 shows a front view of the bumper RF 20 as seen from the front of the vehicle. As shown in this figure, the bumper RF 20 is provided on the left side portion 20A as the "first low proof stress portion" provided on the left side in the vehicle width direction, and on the center portion in the vehicle width direction adjacent to the left side portion 20A. It is configured to include a central portion 20B and a right portion 20C as a "second low proof stress portion" provided on the right side in the vehicle width direction adjacent to the central portion 20B. The front wall 20D in the left side portion 20A and the right side portion 20C is provided with a plurality of through holes 20A1 and 20C1 by, for example, cutting or pressing, and the number of through holes 20C1 provided in the right side portion 20C is equal to the left side portion 20A. The number is set smaller than the number of through holes 20A1 provided.

6A to 6C are cross-sectional views of the right side portion 20C, the central portion 20B, and the left side portion 20A of the bumper RF 20, as viewed from the left side in the vehicle width direction, respectively. The bumper RF20 is integrally formed by extrusion molding of a metal such as aluminum, and the right side portion 20C, the central portion 20B, and the left side portion 20A are spaced apart from each other on the front side and the rear side of the vehicle. 20D and a rear wall 20E, an upper wall 20F and a lower wall 20G that connect upper end portions and lower end portions of the front wall 20D and the rear wall 20E, respectively, in the vehicle front-rear direction, and the front wall 20D and the rear wall 20E, the vehicle front-rear direction. And a first lateral wall 20H and a second lateral wall 20I connected to each other. The first horizontal wall 20H and the second horizontal wall 20I divide the closed section in the central portion 20B into three vertical sections.

The central portion 20B of the bumper RF20 has the shape of the extruded material obtained by extrusion molding. In other words, no through hole is formed in the central portion 20B. On the other hand, the through holes 20A1 and 20C1 are formed in the front wall 20D of the left side portion 20A and the right side portion 20C as described above.

As shown in FIG. 6C, the through hole 20A1 includes a front wall 20D of the left side portion 20A, a top wall 20F and a first horizontal wall 20H, a first horizontal wall 20H and a second horizontal wall 20I, And the second lateral wall 20I and the lower wall 20G, respectively. In other words, three through holes 20A1 are provided in the vehicle vertical direction of the front wall 20D, avoiding a portion where the first horizontal wall 20H and the second horizontal wall 20I are connected to the front wall 20D. The three through holes 20A1 in the vehicle vertical direction are provided at predetermined intervals in the vehicle width direction (see FIG. 5).

As shown in FIG. 6(A), the through hole 20C1 is formed between the upper wall 20F and the first lateral wall 20H and between the second lateral wall 20I and the lower wall 20G in the front wall 20D of the right side portion 20C. Each is provided. In other words, two through holes 20C1 are provided in the vehicle vertical direction of the front wall 20D, avoiding the portion where the first horizontal wall 20H and the second horizontal wall 20I are connected to the front wall 20D. The two through holes 20C1 in the vehicle vertical direction are provided at predetermined intervals in the vehicle width direction (see FIG. 5).

Returning to FIG. 5, the number of through holes 20C1 per unit area of the front wall 20D in the right side portion 20C is set to be smaller than the number of through holes 20A1 per unit area of the front wall 20D in the left side portion 20A. As a result, the bending resistance of the right side portion 20C is higher than the bending resistance of the left side portion 20A. Further, since the through hole is not formed in the central portion 20B, the bending resistance is higher than that of the adjacent left side portion 20A and right side portion 20C.

When the sum of the areas of the through holes 20C1 per unit area of the front wall 20D in the right side portion 20C is smaller than the sum of the areas of the through holes 20A1 per unit area of the front wall 20D in the left side portion 20A, the right side portion The bending yield strength of 20C is higher than the bending yield strength of the left side portion 20A. Therefore, the resistance difference between the left side portion 20A and the right side portion 20C may be set by adjusting the area (diameter) of the holes instead of the number of the through holes 20A1 and the front wall 20D of the through holes C1 per unit area. .. For example, the bending resistance of the right side portion 20C is set to the left side portion by making the area (diameter) of the through hole C1 smaller than that of the through hole 20A1 with the same number of the through holes 20A1 and the through holes C1 per unit area of the front wall 20D. It may be set to be higher than 20A. Further, the yield strength difference may be set by adjusting both the number and the area of the through holes 20A1 and the through holes C1.

In this way, the bumper RF 20 is configured such that the bending resistance becomes higher in the order of the left side portion 20A, the right side portion 20C, and the central portion 20B. As a result, of the bumper RF20, the portion where the three through holes 20A1 closest to the boundary portion between the left side portion 20A and the central portion 20B are formed is the most easily broken, and the first bending start portion 20J that is first broken at the time of a center pole collision. Is composed of. Further, the portion where the two through-holes 20C1 closest to the boundary between the central portion 20B and the right side portion 20C are formed constitutes the second folding starting point portion 20K which is folded next to the first folding starting point portion 20J.

In other words, the bumper RF 20 has two portions (left side portion 20A and right side portion 20C) having different bending proof strengths with the central portion 20B interposed therebetween. The first folding start point portion 20J is located on the left side portion 20A whose bending resistance is set lower than that of the right side portion 20C and the central portion 20B. Further, the second folding start point portion 20K is located in the right side portion 20C, which has a bending resistance higher than that of the left side portion 20A but is lower than that of the central portion 20B. By providing a difference in proof strength to each part of the bumper RF20 in this way, the first folding start point portion 20J located on the left side portion 20A of the bumper RF20 is first folded at the time of a center pole collision, and the second folding start point located on the right side portion 20C. The order of folding is controlled so that the portion 20K is folded next to the first folding start portion 20J.

Depending on the collision position and the collision angle of the collision object on the bumper RF20 during the center pole collision, the three penetration holes 20A1 closest to the boundary portion between the left side portion 20A and the central portion 20B may penetrate the outer side in the vehicle width direction. The portion where the hole 20A1 is formed may serve as the first folding start point portion 20J. Similarly, the portion where the through hole 20C1 on the outer side in the vehicle width direction, which is closest to the boundary portion between the central portion 20B and the right side portion 20C, is located outside the through hole 20C1 may be the second folding start point portion 20K.

<Effect>
Next, the operation and effect of this embodiment will be described in comparison with the comparative example shown in FIG. 7.

In the vehicle front structure according to the comparative example shown in FIG. 7, the bumper RF100 is integrally formed by extrusion molding, and does not have a portion where a through hole is formed in the extrusion molded material. In other words, the bumper RF 100 has an eye-shaped cross section as a whole shown in FIG. 6(B). Therefore, the position where the bumper RF 100 is folded and the order in which it is folded are not controlled. Therefore, when the engine 30R collides with the pole P and breaks at the folding starting point portion 100A on the engine 30R side, the engine 30R is not supported by the gear box 44, and therefore the engine 30R and the transaxle are different from those supported by the gear box 44. The shear input generated at the connecting portion 34 with 30L becomes large. Then, the connection between the engine 30R and the transaxle 30L is released (in other words, the power unit is cracked), and only the engine 30R, which receives the collision load from the folding starting point 100A, moves to the vehicle interior side, so that the dash portion 40 On the other hand, the load may be locally transmitted, and the deformation amount of the dash portion 40 may increase.

On the other hand, in the present embodiment, as shown in FIGS. 1 to 4, a pair of left and right front side members 10 extend in the vehicle front portion along the vehicle front-rear direction. A bumper RF 20 extends along the vehicle width direction and connects the front ends of the pair of left and right front side members 10. A power unit 30 is arranged between the pair of left and right front side members 10 and behind the bumper RF 20 in the vehicle.

The power unit 30 is configured by connecting an engine 30R forming a right side portion and a transaxle 30L forming a left side portion to each other. Since the gear box 44 is provided in the area between the dash section 40 and the power unit 30, if the power unit 30 moves rearward of the vehicle (for example, moves in parallel), the transaxle 30L of the power unit 30 is in gear. First supported by box 44.

A through hole is not formed in the central portion of the bumper RF20 in the vehicle width direction, and a central portion 20B having a bending resistance higher than those of the other portions (the left portion 20A and the right portion 20C) is provided. .. Further, a left side portion 20A having a plurality of through holes 20A1 is provided on the same side as the transaxle 30L supported by the gear box 44 with respect to the center in the vehicle width direction. A plurality of through holes C1 are provided on the side opposite to the transaxle 30L supported by the gear box 44 with respect to the center in the vehicle width direction, that is, on the side opposite to the left side portion 20A, and the bending resistance is higher than that of the left side portion 20A. The set right side portion 20C is provided.

As a result, in the vehicle front structure of the present embodiment, as shown in FIGS. 1 to 3, the position of the first folding start point 20J is such that the first folding start point 20J is located at the engine 30R and the transaxle 30L during a center pole collision. Is set to transmit a collision load to a device supported by the gear box 44,
Therefore, in the vehicle front structure of the present embodiment, it is easy to realize the deformation mode described below at the time of a center pole collision.

That is, at the time of a center pole collision, as shown in FIG. 2, the bumper RF20 does not break at the center position in the vehicle width direction with which the pole P abuts, and the center portion 20B having the highest bending resistance of the bumper RF20 and the bending resistance are the same. It folds at a first folding start point portion 20J (a portion where three through holes 20A1 closest to the central portion 20B are formed) located near the boundary with the lowest left side portion 20A. Next, as shown in FIG. 3, the first bending start point portion 20J of the bumper RF20 transmits the collision load (indicated by the arrow F) to the transaxle 30L of the power unit 30. When the power unit 30 moves rearward of the vehicle due to the collision load, the power unit 30 (transaxle 30L) is supported by the gear box 44. Since the device (transaxle 30L) supported by the gearbox 44 and the device (transaxle 30L) for transmitting the collision load by the first bending start point portion 20J are the same device, the engine 30R and the transaxle 30L are the same. The shearing force generated at the connecting portion 34 with and does not increase. As a result, cracking of the power unit is suppressed.

Further, by suppressing the cracking of the power unit, the reaction force from the power unit 30 to the bumper RF 20 (reaction force to the force indicated by the arrow F in FIG. 3) increases at the first bending start point portion 20J. For this reason, as shown in FIG. 3, the bumper RF20 has a second folding start point located near the boundary between the second portion, that is, the central portion 20B having the highest bending resistance and the right portion 20C having the second highest bending resistance. The portion 20K (the portion closest to the central portion 20B where the two through holes 20C1 are formed) is likely to be broken. When the second folding starting point portion 20K is broken, as shown in FIG. 4, the power unit 30 is pushed rearward of the vehicle in a range between the first folding starting point portion 20J and the second folding starting point portion 20K in the bumper RF20 ( This means that the collision load can be dispersed in the vehicle width direction. As a result, local input to the dash portion 40 can be suppressed, and thus deformation of the vehicle interior can be suppressed.

As described above, in this embodiment, the deformation amount of the vehicle interior can be reduced by controlling the bending position and the order of bending of the bumper RF20 without increasing the mass and the number of parts of the bumper RF20.

Further, although simplified in the drawing, the rear surface of the power unit 30 has an uneven shape. In the present embodiment, the rear end of the vehicle in the vehicle front-rear direction and the gear box 44 of the rear surface having the uneven shape are opposed to each other in the vehicle front-rear direction. That is, the vehicle front-rear direction rear end portion of the power unit 30 is first supported by the dash portion 40. For this reason, the power unit 30 can be supported from the rear early after the occurrence of the center pole collision.

Although not described for simplification, a cooling unit (not shown) or the like is usually arranged between the bumper RF 20 and the power unit 30. Therefore, when a center pole collision occurs and the first bending start portion 20J of the bumper RF20 is broken and displaced toward the power unit 30 side, the collision load is transmitted from the bumper RF20 to the power unit 30 via the cooling unit or the like.

[Supplementary explanation of the above embodiment]
In addition, in the said embodiment, although the example which the shape of the through-hole 20A1 formed in the left side part 20A and the through-hole 20C1 formed in the right side part 20C was circular was shown, this invention is not limited to this. Other shapes such as an oval shape may be used. Further, the through hole 20A1 and the through hole 20C1 may have different shapes.

Further, in the above embodiment, three through holes 20A1 are provided in the vehicle vertical direction of the front wall 20D, and two through holes 20C1 are provided in the vehicle vertical direction of the front wall 20D. Not limited to. The bending strength of the right side portion 20C may be set higher than that of the left side portion 20A and lower than that of the central portion 20B. For example, three through holes 20C1 may be provided in the vehicle up-down direction like the through hole 20A1, and the area of each through hole 20C1 may be smaller than that of the through hole 20A1.

Further, in the above-described embodiment, an example in which the through holes 20A1 and 20C1 are formed only on the front wall 20D of the bumper RF20 has been described, but the present invention is not limited to this. For example, additional through holes may be provided in the rear wall 20E.

Further, in the above-described embodiment, an example in which the gear box 44 projects toward the front of the vehicle with respect to the dash panel 42 that is a general part of the dash portion 40 and functions as a “rear support portion” has been described. Not limited.

For example, a part of the power unit 30 projects rearward, and this part is first supported by, for example, the dash panel 42 in the dash part 40 (in this case, part of the dash panel 42 is a “rear support part”). Equivalent to)). Even in this case (even if a part of the dash portion is the rear support portion), it can be said that the rear support portion is provided in the area between the dash portion and the power unit.

Further, in the above-described embodiment, the example in which the gear box 44 as the “rear support portion” is arranged at the position displaced leftward in the vehicle width direction with respect to the center in the vehicle width direction has been described, but the present invention is not limited to this. Not done.

For example, the gear box 44 may be arranged at a position displaced to the right in the vehicle width direction with respect to the center in the vehicle width direction. In this case, considering the configuration of the power unit 30 of the above embodiment, the gear box 44 supports the engine 30R (right side device). In this case, the left side portion 20A of the bumper RF20 having the lowest bending resistance is arranged on the right side in the vehicle width direction with respect to the central portion 20B. Further, the right side portion 20C, which has a smaller number of through holes 20C1 than the left side portion 20A and has the second lowest bending resistance, is arranged on the left side in the vehicle width direction with respect to the central portion 20B. Therefore, when the center pole collides, the first folding start point portion 20J that is first folded is arranged on the right side, and the second folding start point portion 20K that is folded second is arranged on the left side.

Further, the rear support portion may be located at the center in the vehicle width direction. In this case, considering the configuration of the power unit 30 of the above-described embodiment, the rear support portion supports the engine 30R (right side device). Therefore, the structure of the bumper RF20 has a first folding start point portion 20J that is first folded at the time of a center pole collision on the right side and a second folding start point portion 20K that is folded second at the left side.

Further, the “rear support portion” of the present invention is not limited to the gearbox 44. For example, a master cylinder may be used, or a dash cloth that is a skeleton member that connects the front ends of a pair of left and right rockers (frame members that extend in the vehicle front-rear direction at both vehicle width direction ends at the lower part of the vehicle body) Good.
Further, the rear support portion is a portion (member) that can generate a reaction force with respect to the power unit. Therefore, a portion (member) that is easily deformed when a collision load is applied via the power unit, such as a pipe or a bracket, does not correspond to the rear support portion.

Further, in the above embodiment, the example in which the second folding start point portion 20K is provided at a position symmetrical to the first folding start point portion 20J with respect to the center in the vehicle width direction has been described, but the present invention is not limited to this. .. The second folding start point portion 20K may be provided at a position opposite to the first folding start point portion 20J with respect to the center in the vehicle width direction.

Further, in the above-described embodiment, as shown in FIG. 1, the example in which the first folding start point portion 20J is set at a position outside the “rear support portion” (gear box 44) in the vehicle width direction has been described. However, the present invention is not limited to this. The first folding start point portion 20J may be set at a position inside the vehicle width direction with respect to the rear support portion.

10 Front side member 20 Bumper RF (Bumper reinforcement)
20A Left side part (first low proof stress part)
20A1 through hole 20B central part 20C right side part (second low proof stress part)
20C1 through hole 30 power unit 30R engine (right side device)
30L transaxle (left side device)
40 Dash 44 Gearbox (rear support)

Claims (1)

A pair of left and right front side members that are arranged on both sides of the front part of the vehicle and extend along the vehicle front-rear direction,
A power unit that is arranged between the pair of left and right front side members, and is configured by connecting a right side device forming a right side part and a left side device forming a left side part to each other,
A dash portion located behind the vehicle of the power unit and in front of the passenger compartment,
A rear support portion which is provided in an area between the dash portion and the power unit and which supports the right side device or the left side device of the power unit when the power unit moves to the rear of the vehicle,
A central portion that extends along the vehicle width direction and connects the front ends of the pair of left and right front side members, is provided in the vehicle width direction central portion, and has a bending resistance set higher than other portions, A first low withstand strength portion provided on the same side as the right side device or the left side device supported by the rear support portion with respect to the center in the vehicle width direction and having a plurality of through holes, and with respect to the center in the vehicle width direction. A second low proof stress portion which is provided on the opposite side of the right side device or the left side device supported by the rear support portion and which has a plurality of through holes and whose bending proof strength is set higher than that of the first low proof stress portion. And a bumper reinforcement having,
And a vehicle front structure.