JP2020082757A - 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 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 22 installed at the center part in the vehicle width direction and having a plurality of reinforcement ribs 22E, 22F; a left side part 26 without a reinforcement rib, 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; a right side part 24 having the reinforcement ribs 24E number of which is less than that of the center part 22; a first folding starting point 28; and a second folding starting point 29.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 a closed cross section that is substantially vertical to the vehicle width direction is partitioned into a plurality of hollow portions in the vehicle up-down direction and a plurality of uniformly extended in the vehicle width direction A central portion provided with a reinforcing rib in the vehicle width direction central portion, and the reinforcing rib 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 vehicle width direction center. A first low proof part not having a number, and a number less than the reinforcing ribs of the central part provided on the opposite side to 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. Second low proof stress portion provided with a reinforcing rib, a first folding start point portion located at a boundary portion between the central portion and the first low proof stress portion and serving as a folding start point at the time of collision, the central portion and the second A bumper reinforcement having a second folding start point portion which is located at a boundary portion with the low load bearing portion and is bent after the first folding start point portion.

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.

A center portion of the bumper RF in the vehicle width direction is provided with a plurality of reinforcing ribs that partition a closed cross section substantially perpendicular to the vehicle width direction into a plurality of hollow portions in the vehicle vertical direction and that extend uniformly in the vehicle width direction. Section is provided. In addition, a first low yield strength portion having no reinforcing rib is 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. Further, a reinforcing rib, which is smaller in number than the reinforcing ribs in the central portion, is 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 load bearing portion. A second low proof stress portion is provided. The boundary portion between the central portion and the first low proof stress portion is the first folding start point portion which is the folding start point at the time of collision, and the boundary portion between the central portion and the second low proof stress portion is more than the first folding start point portion. It is said to be the second folding start point that will be folded later.

Here, if the second folding start point 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 folding start point portion, the second folding part of the right side device or the left side device. Since the device in which the starting point part transmits the collision load is different from the device supported by the rear support part, 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 second folding start point moves to the passenger compartment side, and As a result, the load is locally transmitted, and the amount of deformation of the dash portion may increase.

In view of this, in this vehicle front structure, the first low yield strength portion is not provided with the reinforcing ribs, and the number of the reinforcing ribs of the second low yield strength portion is set to be smaller than the number of the reinforcing ribs of the central portion. In other words, the number of hollow portions in the closed cross section partitioned by the reinforcing ribs is set to increase in the order of the first low proof stress portion, the second low proof stress portion, and the central portion. Therefore, the proof stress of each part of the bumper RF increases in the order of the first low proof stress part, the second low proof stress part, and the central part. As a result, the boundary portion between the central portion and the first low proof stress portion becomes the first fold starting point portion that folds first at the time of a center pole collision, and the boundary portion between the central portion and the second low proof stress portion folds next. Become a part. Further, since the position of the first folding start 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 folding start point portion is set at the time of a center pole collision. The right side device and the left side device are set to transmit the collision load to the device supported by the rear support portion.

In other words, since the device supported by the rear support part and the device for transmitting the collision load at the first folding start point that is first folded are the same device, the shear input generated at the connecting portion between the right side device and the left side device is input. 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 increases at the first bending start portion. Therefore, the bumper RF is likely to be broken at the second bending start point. When a fold occurs at the second fold start point, the power unit is pushed rearward of the vehicle in the range between the first fold start point and the second fold start point of the bumper RF, and the collision load can be dispersed 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 folded at a first folding start point portion. FIG. 3 is a schematic plan view showing a moment when the bumper RF is folded at a second folding start point 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 and 6.

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 serves as a central portion 22 provided in the central portion in the vehicle width direction and a "second low proof stress portion" provided adjacent to the central portion 22 on the right side in the vehicle width direction. It is configured to include a right side portion 24 and a left side portion 26 adjacent to the center portion 22 on the left side in the vehicle width direction as a “first low proof stress portion”.

The central portion 22, the right side portion 24, and the left side portion 26 are separately formed by extrusion molding of a metal such as aluminum, and both ends in the vehicle width direction of the central portion 22 are left and right side portions of the right side portion 24. The bumper RF20 is configured by being joined to the right end portion of each by welding or the like. 1 to 5, the shaded patterns attached to the central portion 22, the right side portion 24, and the left side portion 26 are intended to clearly show the correspondence between the drawings.

6A to 6C are cross-sectional views of the right side portion 24, the center portion 22, and the left side portion 26 of the bumper RF 20 as viewed from the left side in the vehicle width direction. The right side portion 24, the center portion 22, and the left side portion 26 are separately formed by extrusion molding as described above, and have different cross-sectional shapes.

As shown in FIG. 6(B), the central portion 22 of the bumper RF 20 has an eye-shaped cross section. Specifically, the front wall 22A and the rear wall 22B, which are spaced apart from each other on the front side and the rear side of the vehicle, and the upper end portions and the lower end portions of the front wall 22A and the rear wall 22B are connected in the vehicle front-rear direction, respectively. It is configured to include an upper wall 22C and a lower wall 22D, and reinforcing ribs 22E and 22F that connect the front wall 22A and the rear wall 22B in the vehicle front-rear direction. The reinforcing ribs 22E and 22F partition the closed cross section of the central portion 22 into three hollow portions 22G, 22H, and 22I in the vehicle vertical direction.

As shown in FIG. 6A, the right side portion 24 has a V-shaped cross section. Specifically, the front wall 24A and the rear wall 24B, which are spaced apart from each other on the front side and the rear side of the vehicle, and the upper end portions and the lower end portions of the front wall 24A and the rear wall 24B are connected in the vehicle front-rear direction, respectively. It is configured to include an upper wall 24C and a lower wall 24D, and a reinforcing rib 24E that connects the front wall 24A and the rear wall 24B in the vehicle front-rear direction. The reinforcing rib 24E divides the closed cross section of the right side portion 24 into two hollow portions 24F and 24G in the vehicle vertical direction. Whereas the number of reinforcing ribs 22E, 22F, 24E connecting the front walls 22A, 24A and the rear walls 22B, 24B respectively in the vehicle front-rear direction is two in the central portion 22, that is, the reinforcing ribs 22E, 22F, The right side portion 24 is one of the reinforcing ribs 24E and is smaller in number than the central portion 22. As a result, the bending resistance of the right side portion 24 is smaller than the bending resistance of the central portion 22.

As shown in FIG. 6C, the left side portion 26 includes a front wall 26A and a rear wall 26B that are spaced apart from each other on the front side and the rear side of the vehicle, and upper end portions of the front wall 26A and the rear wall 26B. It is configured by an upper wall 26C and a lower wall 26D that connect the lower end portions to each other in the vehicle front-rear direction, and does not include a reinforcing rib that connects the front wall 26A and the rear wall 26B in the vehicle front-rear direction. That is, the closed cross section is constituted by only one hollow portion 26E. As a result, the bending resistance of the left side portion 26 is smaller than the bending resistance of the central portion 22 and the right side portion 24.

As described above, in the bumper RF 20, the number of the reinforcing ribs 22E, 22F, 24E connecting the front walls 22A, 24A, 26A and the rear walls 22B, 24B, 26B in the vehicle front-rear direction is the central portion 22 and the right side portion 24. , The left side portion 26 decreases in that order (zero in the left side portion 26). As a result, the bending strength is set to decrease in the order of the central portion 22, the right side portion 24, and the left side portion 26.

That is, in the bumper RF 20, the boundary portion between the left side portion 26 and the central portion 22 is most easily broken, and constitutes a first folding start portion 28 that is first broken at the time of a center pole collision. Further, the boundary portion between the right side portion 24 and the central portion 22 constitutes a second folding start point portion 29 that is folded next to the first folding start point portion 28.

In other words, the bumper RF 20 has two fold starting points (first fold starting point 28 and second fold starting point 29) with the central portion 22 interposed therebetween. The bending strength of the first folding start point portion 28 is set to be smaller than the bending strength of the second folding start point portion 29. As a result, the order of folding is controlled such that the first folding start portion 28 of the bumper RF20 is folded first when the center pole collides, and the second folding start portion 29 is folded next to the first folding start portion 28.

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

As shown in FIG. 7, in the vehicle front structure according to the comparative example, the entire bumper RF100 is integrally formed by extrusion molding and does not have a portion whose cross-sectional shape is changed. 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, as shown in FIG. 7, 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, compared with the case where the engine 30R is supported by the gear box 44. As a result, the shear input generated at the connecting portion 34 between the engine 30R and the transaxle 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.

As shown in FIG. 5 to FIG. 6C, in the central portion of the bumper RF 20 in the vehicle width direction, a closed cross section that is substantially vertical to the vehicle width direction is partitioned into a plurality of hollow portions 22G, 22H, 22I in the vehicle vertical direction. At the same time, a central portion 22 including two reinforcing ribs 22E and 22F that extend uniformly in the vehicle width direction is provided. Further, the left side portion 26 having no reinforcing rib 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. The right side portion 24 is 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 26. The right side portion 24 is provided with a smaller number of reinforcing ribs 24E than the reinforcing ribs 22E and 22F of the central portion 22, and the closed cross section is divided into two hollow portions 24F and 24G by the reinforcing ribs 24E. A boundary portion between the central portion 22 and the left side portion 26 is a first folding start point portion 28 that is first folded at the time of a center pole collision, and a boundary portion between the central portion 22 and the right side portion 24 is a second folding start point portion 29 that is folded next. Has been done.

As a result, in the vehicle front structure of the present embodiment, as shown in FIG. 3, the position of the first folding start point 28 is the gear of the engine 30R and the transaxle 30L when the center pole collision occurs. It is set to transmit the collision load to the device supported by the 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 abuts, but at the first folding start point portion 28. Next, as shown in FIG. 3, the first bending start point portion 28 of the bumper RF 20 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. Here, since the device supported by the gear box 44 (transaxle 30L) and the device for transmitting the collision load by the first bending start portion 28 (transaxle 30L) 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, the cracking of the power unit is suppressed, so that the reaction force from the power unit 30 to the bumper RF 20 (the reaction force with respect to the force indicated by the arrow F in FIG. 3) at the first bending start portion 28 increases. Therefore, as shown in FIG. 3, the bumper RF 20 is likely to be folded at the second point, that is, the second folding start point portion 29. When the second bending start portion 29 is broken, as shown in FIG. 4, the power unit 30 is pushed rearward of the vehicle in the range between the first bending start portion 28 and the second bending start portion 29 of 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 the present 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 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 28 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, although the said embodiment demonstrated the example which has two reinforcement ribs 22E and 22F of the center part 22, and one reinforcement rib 24E of the right side part 24, this invention is not limited to this. By setting the number of the reinforcing ribs of the central portion 22 to be larger than the number of the reinforcing ribs of the right side portion 24, it is possible to make a difference in bending strength, and it is possible to control the folding position and the order of folding of the bumper RF20. it can.

Further, in the above embodiment, an example in which the reinforcing ribs 22E, 22F, 24E extend in the vehicle front-rear direction has been described, but the present invention is not limited to this. In other words, the cross-sectional shape of the central portion 22 is not limited to the eye shape, and the cross-sectional shape of the right side portion 24 is not limited to the sun-shaped shape. The reinforcing ribs 22E, 22F, and 24E may be configured so as to partition the central portion 22 and the right side portion 24 into a plurality of hollow portions in the vehicle vertical direction, and may be inclined upward or downward toward the vehicle front side, for example. ..

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 26 of the bumper RF 20 having the smallest bending resistance is arranged on the right side in the vehicle width direction with respect to the center portion 22. Further, the right side portion 24 having the second smallest bending resistance is arranged on the left side in the vehicle width direction with respect to the central portion 22. Therefore, when the center pole collides, the first folding start point portion 28 that is first folded is arranged on the right side, and the second folding start point portion 29 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 bumper RF 20 has a first folding start point portion 28 that is first folded at the time of a center pole collision on the right side and a second folding start point portion 29 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-described embodiment, an example in which the second folding start point portion 29 is provided at a position symmetrical to the first folding start point portion 28 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 29 may be provided at a position opposite to the first folding start point portion 28 with respect to the center in the vehicle width direction.

Further, in the above-described embodiment, as shown in FIG. 1, an example in which the first folding start point portion 28 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 28 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)
22 Central part 22E, 22F Reinforcing ribs 22G, 22H, 22I Hollow part 24 Right part (second low yield strength part)
24E Reinforcing ribs 24F, 24G Hollow part 26 Left side part (first low yield strength part)
28 First Folding Starting Point 29 Second Folding Starting Point 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,
The front ends of the pair of left and right front side members that extend along the vehicle width direction are connected to each other, and a closed cross section that is substantially vertical to the vehicle width direction is partitioned into a plurality of hollow portions in the vehicle up-down direction and is also formed in the vehicle width direction. The same 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 and the center portion provided in the center in the vehicle width direction with a plurality of extending reinforcing ribs. A first low proof portion provided on the side and not including the reinforcing rib, and the central portion provided on the opposite side to 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. A second low withstand strength portion having a smaller number of reinforcing ribs than the reinforcing ribs, and a first folding start point portion which is located at a boundary portion between the central portion and the first low withstand strength portion and serves as a folding start point at the time of collision. A bumper reinforcement having a second fold starting portion located at a boundary portion between the central portion and the second low proof stress portion and being folded after the first fold starting portion,
And a vehicle front structure.