JP5403249B2 - Front body structure of the vehicle - Google Patents

Description

  The present invention relates to a front body structure of a vehicle, and more particularly to a front body structure of a vehicle including a vehicle width direction member that pays a lower leg portion of a pedestrian to a lower side of a front side frame and a front side position of a bumper reinforcement.

  Conventionally, in order to prevent secondary obstacles such as the pedestrian's entanglement below the vehicle body at the time of collision between the vehicle and the pedestrian, the lower leg of the pedestrian is paid at the time of the collision and the pedestrian is jumped on the hood. Things have been done. As a specific configuration, a front vehicle body structure including a vehicle width direction member supported by a shroud drawer member and extending in the vehicle width direction at a position below the bumper reinforcement, a so-called leg wiping member is known. The leg-pasting member absorbs collision energy while being crushed toward the rear of the vehicle body at the time of a collision with a pedestrian, so that a constant support rigidity is required and is supported by a vehicle body component member such as a shroud drawer member via a bracket. .

In the vehicle body structure described in Patent Document 1, a pair of support members fixed to a pair of left and right front side frames, and legs as vehicle width direction members that are supported by these support members and extend in the vehicle width direction. A paying member is provided below and in front of the bumper reinforcement, and the leg paying member is configured to be deformable in accordance with collision energy with a pedestrian. In this vehicle body structure, the leg-pasting member can be firmly supported by the front side frame, and the impact load due to the collision is absorbed by the deformation of the leg-pasting member to ensure the safety of the lower leg portion of the pedestrian.

Along with the diversification of vehicle design, the streamlined shape with the bonnet height lowered and the outer surface of the bumper face curved toward the rear of the vehicle body in the vehicle width direction compared to the center part in the vehicle width in plan view A front body structure also exists. In this front vehicle body structure, the radiator is set in a forward leaning posture, and the layout of the vehicle body constituent members arranged on the outer portion in the vehicle width direction is adjusted according to the curved shape of the bumper face.

JP 2001-88634 A

  In the vehicle body structure of Patent Document 1, even when the shroud drawer member is disposed at the rear position of the front portion of the vehicle body, the leg washer is attached to the front side frame by a support member such as a highly rigid bracket or tie-down hook. It can be firmly fixed. However, since the leg wiper member is arranged between the vehicle widths below the left and right front side frames, and the bumper face needs to cover the outer periphery of the left and right ends of the leg wiper member, the lower shape of the bumper face May have a shape protruding outward in the vehicle width direction when seen in a plan view.

  Further, the pedestrian's leg-paying function allows the lower leg portion of the pedestrian to be more efficiently paid out as the position of the leg-paying member is lower, and the pedestrian can be reliably guided onto the hood. However, the lower the position of the leg-paying member, the more the outer end of the leg-paying member protrudes outward in the vehicle width direction at the lower part of the vehicle body. It may be difficult to realize a bumper face shape having such an appearance.

  An object of the present invention is to provide a front vehicle body structure having a high degree of design freedom while ensuring a leg-paying function at the time of a collision with a pedestrian, a front vehicle body structure that can ensure a high safety of a pedestrian, and the like. .

The front vehicle body structure of the vehicle according to claim 1 is attached to a pair of left and right front side frames extending in the longitudinal direction of the vehicle body below the bonnet and the front end portions of the pair of front side frames and extends in the vehicle width direction. A bumper reinforcement and a front portion of the vehicle body that is provided in front of the bumper reinforcement and that has a central portion in the vehicle width direction at the front end in the vehicle front-rear direction and curved toward the rear of the vehicle body at an outer portion in the vehicle width direction. A front of a vehicle having a bumper face that forms a surface and a vehicle width direction member that is positioned lower than the pair of front side frames and has a front end disposed in front of the bumper reinforcement and extending in the vehicle width direction. In the vehicle body structure, the vehicle width direction member is configured such that the outer end portion in the vehicle width direction is located above the center portion in the vehicle width direction. It is characterized by a door.

In this front body structure, the vehicle width direction outer end portion of the vehicle width direction member can be disposed at a position higher than the vehicle width direction central portion while lowering the position of the vehicle width direction member. The amount of protrusion of the left and right end side lower portions to the outside in the vehicle width direction can be suppressed.

The invention of claim 2 is characterized in that, in the invention of claim 1, an outer end portion in the vehicle width direction of the vehicle width direction member is arranged at a position directly below at least the pair of front side frames.
According to a third aspect of the present invention, in the first or second aspect of the invention, the vehicle width direction member is formed so as to be smoothly curved upward from the vehicle width direction center portion to the vehicle width direction outer end portion. It is characterized by that.

According to a fourth aspect of the present invention, in the first or second aspect of the invention, the vehicle width direction member includes a rising portion extending upward at a transition portion from the vehicle width direction central portion to the vehicle width direction outer end portion. It is a feature.
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the pair of front side frames are provided with a pair of left and right support members for supporting the vehicle width direction member, The support member includes an impact absorbing portion capable of absorbing an impact load in the vehicle front-rear direction input to the vehicle width direction member.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, an under cover that covers a lower surface of a vehicle body is provided below the vehicle width direction member. The front end portion includes a support portion that supports the vehicle width direction member.
The invention of claim 7 is the invention according to any one of claims 1 to 6, wherein the heat exchanger and the heat exchanger are supported at a rear position of the vehicle width direction member between the pair of front side frames. A shroud is provided, and the heat exchanger is arranged to be inclined forward in the front-rear direction of the vehicle body.

According to the invention of claim 1, even when the arrangement position of the vehicle width direction member is lowered, the amount of protrusion of the vehicle width direction member to the vehicle width direction outer side in the lower part of the vehicle can be suppressed when viewed from the front. The lower part of the left and right end sides of the bumper face can be curved toward the rear of the vehicle body toward the vehicle width direction outer side portion compared to the vehicle width direction center portion, and the degree of freedom in designing the vehicle body front portion can be increased. And since the arrangement | positioning of a vehicle width direction member can be made low, a pedestrian's lower leg part can be paid reliably and a pedestrian can be efficiently guided on a bonnet.

According to the invention of claim 2, the lower leg portion of the pedestrian can be paid over a wide range in the vehicle width direction across the left and right front side frames, and the safety of the pedestrian in the event of a collision can be ensured. it can.
According to the invention of claim 3, the length of the vehicle width direction member can be shortened, and the weight of the vehicle body can be reduced. In addition, since the vehicle width direction member is smoothly curved, when the lower leg portion of the pedestrian comes into contact with the vehicle width direction member, the pedestrian can be actively guided onto the hood on the center side in the vehicle width direction. A pedestrian's bumper reinforcement can be prevented from bottoming out at the front portion in the vehicle width direction outside.

According to the fourth aspect of the present invention, since the space where the bumper face can be bent can be formed on the outer side in the vehicle width direction of the rising portion, the lower portion of the bumper face is compared with the central portion in the vehicle width direction when seen in a plan view. Thus, the outer portion in the vehicle width direction can be curved toward the rear of the vehicle body, and the degree of freedom in design can be increased.
According to the invention of claim 5, since the impact absorbing portion of the support member absorbs the collision energy, the vehicle width direction member can be reduced in size, and the weight of the vehicle body can be reduced. Moreover, since the vehicle width direction member and the shock absorbing part cooperate to absorb the impact load more than the collision energy necessary for guiding the pedestrian on the hood, the impact load applied to the pedestrian can be kept low. it can.

According to the invention of claim 6, when the vehicle collides with the pedestrian, the downward moment applied to the center portion of the vehicle width direction member can be supported by the under cover, and the pedestrian can be reliably guided onto the hood. it can.
According to the seventh aspect of the present invention, in the low bonnet vehicle in which the radiator is disposed in the forward leaning posture, the outer portion in the vehicle width direction is closer to the rear of the vehicle body than the central portion in the vehicle width direction while ensuring the leg-paying function. The appearance of the curved front part of the vehicle body can be obtained.

It is a top view of the front part vehicle body concerning Example 1 of the present invention. It is a front view of the vehicle which removed the bumper face. It is a principal part perspective view inside the right half of the front vehicle body which abbreviate | omitted the shroud panel. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is a perspective view of a supporting member. It is a figure which shows the connection structure of a supporting member and an undercover. FIG. 3 is a diagram corresponding to FIG. 2 according to the second embodiment. FIG. 3 is a diagram corresponding to FIG. 3 according to the second embodiment. It is a perspective view of the modification of the crush can which integrally formed the supporting member which concerns on Example 3. FIG. It is a perspective view of the modification of an undercover.

Hereinafter, modes for carrying out the present invention will be described based on examples.
In the following embodiments, the front-rear direction of the vehicle will be referred to as the front-rear direction, and the left-right direction of the vehicle will be described as the left-right direction.

Embodiments of the present invention will be described below with reference to FIGS.
The front vehicle body 1 of the vehicle V includes a bonnet 2 that covers the upper part of the engine room E, a pair of left and right front side frames 3 that extend in the vehicle body longitudinal direction, a bumper reinforcement 4 that extends in the vehicle width direction, A bumper face 5 forming the outer surface of the vehicle body 1, a leg wiper member 6 (vehicle width direction member) extending in the vehicle width direction, and a support member for supporting the leg wiper member 6 on the pair of left and right front side frames 3 7 and a radiator 8 (heat exchanger) for exchanging heat between cooling water of the engine (not shown) and traveling wind.

  A bonnet reinforcement 2 a extending in the vehicle width direction along the outer edge shape is disposed at the front end portion of the bonnet 2. The bonnet reinforcement 2a forms a closed cross section with the bonnet 2.

  The pair of left and right front side frames 3 are formed to extend in the front-rear direction on the left and right sides of the engine room E on the front side of a dash panel (not shown) that partitions the front end of the passenger compartment. The pair of left and right front side frames 3 extend substantially horizontally from the front position of the vehicle V toward the rear, and the middle part on the rear end side is joined to the vertical wall portion of the dash panel. Since the pair of left and right front side frames 3 have the same configuration, the right front side frame 3 will be mainly described.

  As shown in FIGS. 3 to 5, the front side frame 3 is composed of an outer panel on the outer side in the vehicle width direction and an inner panel on the inner side in the vehicle width direction, and the outer panel and the inner panel close the section with a substantially rectangular shape. A cross section is formed. In the front side frame 3, a plurality of bead portions 3a extending in the vertical direction are formed on each of the outer panel and the inner panel. The bead depth, bead width, and vertical length of each bead portion 3a are set so that the front side frame 3 bends and deforms in a predetermined direction at the time of a frontal collision.

  At the front end portion of the front side frame 3, a flange portion 3b for attaching the crash can 9 via a shroud panel (not shown) is formed. The rectangular cylinder-shaped crash can 9 is formed with two annular front and rear grooves 9 a that are orthogonal to the longitudinal direction of the vehicle body and are recessed inward of the crash can 9. The rear end portion of the crash can 9 is fastened and fixed to the flange portion 3b by bolts.

  A bumper reinforcement 4 is connected to the front end portion of the crash can 9. The bumper reinforcement 4 has a closed cross-sectional shape extending in the left-right direction. The front end portion of the crash can 9 is configured to be fitted into the closed cross section of the bumper reinforcement 4. Accordingly, the bumper reinforcement 4 has a substantially U-shaped cross section at the portion where the crash can 9 is inserted. As described above, the pair of left and right crash cans 9 receive an impact load from the front through the bumper reinforcement 4 at the beginning of the vehicle collision, and the impact load reduces the collision energy by compressing and deforming the grooves 9a and the like. Absorb.

  In front of the bumper reinforcement 4, a shock absorber 10 made of foamed synthetic resin is disposed over the entire vehicle width direction of the bumper face 5. The shock absorber 10 is configured to have a size and a shape that can absorb a collision energy by compressing and deforming by a shock load from the front via the bumper face 5 at the time of a vehicle collision and achieve a desired energy absorbing function. The shock absorber 10 is not limited to the foamed synthetic resin, but can be formed of a synthetic resin structure formed by combining a plurality of ribs.

The bumper face 5 made of a synthetic resin forms the outer surface of the front end portion of the vehicle body, and its center portion in the vehicle width direction is located at the front end in the vehicle front-rear direction, and is more The outer portion in the width direction is formed in a curved shape that curves toward the rear of the vehicle body. Therefore, the thickness in the front-rear direction of the shock absorber 10 at the center portion in the vehicle width direction is formed to be thicker than the thickness in the front-rear direction of the shock absorber 10 at the outer portion in the vehicle width direction. The thickness of the shock absorber 10 in the vicinity is formed thinner than the thickness of the central portion.
Further, the lower left and right lower portions of the bumper face 5 are formed in a curved shape projecting downward, and the appearance of the bumper face 5 is formed in a flat shape extending in the left-right direction when viewed from the front.

The bumper face 5 includes a pair of headlight openings 5a capable of storing headlights on both the left and right sides, an introduction opening 5b capable of introducing traveling wind into the engine room E in the center region in the vehicle width direction, and an introduction opening 5b. An introduction opening 5c or the like that can introduce the traveling wind formed at the lower position is provided.
The introduction opening 5b is formed in a substantially elliptical shape having a long axis as a separation distance between the left and right front side frames 3. The introduction opening 5c is formed in an elongated elliptical shape composed of a major axis that is substantially the same as the major axis of the introduction opening 5b and a minor axis that is shorter than the introduction opening 5b. A pair of left and right front fenders 11 that are continuous with the bumper face 5 and form the outer surface of the side part of the vehicle body are mounted on the rear left and right ends of the bumper face 5.

  As shown in FIGS. 3 to 5, between the pair of left and right front side frames 3, there is a shroud doorper 12 that supports the upper portion of the radiator 8, and the radiator 8 at a position lower and rear than the shroud doorper 12. And a pair of left and right shroud sides (not shown) that connect the left and right ends of the shroud doorper 12 and the left and right ends of the shroud drawer 13 are disposed. The shroud upper 12 and the shroud drawer 13 and the pair of shroud sides are disposed so as to be in a forward inclined posture, and form a rectangular frame shape having an opening in the central region. An opening formed by the shroud upper 12 and the shroud drawer 13 and a pair of shroud sides is disposed so as to face the introduction openings 5 b and 5 c of the bumper face 5. As described above, the radiator 8 is disposed so as to be inclined forward, and the hood height can be kept low.

  Between the shroud upper 12 and the shroud drawer 13, a radiator 8 and a fan 14 for the radiator 8 are arranged. A bracket (not shown) for supporting the upper portion of the radiator 8 is attached to the shroud upper 12 by bolting. A bracket (not shown) for supporting the lower portion of the radiator 8 is attached to the shroud drawer 13. As described above, the radiator 8 is configured to be able to cool the engine coolant with the traveling wind introduced from the introduction opening 5b and the like.

The leg wiping member 6 (vehicle width direction member) is a lower position of the bumper reinforcement 4 and a front end thereof is a front position of the bumper reinforcement 4, that is, below the shock absorber 10 and the lower leg portion of the pedestrian. It is arranged near the rear of the introduction opening 5c corresponding to the height. The synthetic resin leg-pasting member 6 is formed in a substantially circular arc shape that is recessed downward as viewed from the front. In addition, in FIG. 1, since the leg washer 6 is provided in the substantially the same position as the shock absorber 10, description is abbreviate | omitted.

The leg-pasting member 6 is disposed so that the height position in the vertical direction of the center portion in the vehicle width direction is the rear vicinity of the lower opening edge of the introduction opening 5c, and the height in the vertical direction at the outer end portion in the vehicle width direction. It is arranged so that the position is an intermediate position between the introduction opening 5b and the introduction opening 5c. That is, the leg wiper member 6 is formed so as to have a substantially uniform curvature when viewed from the front, and is formed in a curved shape such that the outer end portion in the vehicle width direction is located above the center portion in the vehicle width direction. . Further, the outer end in the vehicle width direction is provided at a position directly below the front side frame 3.

The leg disposing member 6 includes an upper surface portion 6a, a lower surface portion 6b, a front surface portion 6c, a rear surface portion 6d, and the like, and has a solid structure extending in the vehicle width direction. A protrusion 6e that protrudes forward and extends in the vehicle width direction is formed at the lower portion of the front surface portion 6c. The left and right end portions of the leg wiper member 6 are attached to the left and right support members 7 by bolts 15.

  As described above, the space can be formed in the vehicle width direction right and left outer lower side of the leg wiper member 6 when viewed from the front, and the shape of the bumper face 5 is compared with the vehicle width direction central portion when viewed in plan. The outer portion in the width direction can be formed in a curved shape that curves toward the rear of the vehicle body.

  Further, since the outer end portion of the leg wiper member 6 in the vehicle width direction is provided at a position directly below the front side frame 3 and is provided at a position closer to the bumper reinforcement 4 than the central portion in the vehicle width direction, the lower leg of the pedestrian The pedestrian accompanying the decrease in the distance to the face 5 in the outer portion in the vehicle width direction of the bumper reinforcement 4 due to the curved shape of the bumper face 5 can be suppressed more than the central portion in the vehicle width direction. Can be prevented from hitting the bumper reinforcement 4.

As shown in FIG. 2 to FIG. 6, the steel plate support member 7 transmits an impact load to the support body portion 7 b, the support body portion 7 b, and the support body portion 7 b for attaching the support member 7 to the crash can 9. It is possible to be configured integrally with an impact transmitting portion 7c for mounting the leg wiping member 6. These support members 7 are fixed to the lower end surfaces of the left and right crash cans 9 by bolts 16, respectively. Since the left and right support members 7 have the same configuration, the right support member 7 will be described.

As shown in FIG. 6, the mounting portion 7a has three bolt holes 20 through which the bolts 16 can pass through the front portion, the intermediate portion, and the rear portion, and two rows of grooves 9a orthogonal to the longitudinal direction of the vehicle body. There are provided two rows of front and rear bead portions 21 etc. that face each other and are recessed on the opposite side of each groove 9a and extend in the left-right direction. When the support member 7 is fixed to the lower end surface of the crash can 9, the mounting portion 7a is disposed in parallel with the surface orthogonal to the vehicle body vertical direction, and each bead portion 21 is orthogonal to the vehicle longitudinal direction. Has been placed.

As described above, when the groove 9a or the like of the crash can 9 is compressed and deformed due to the collision of the vehicle, the mounting portion 7a fixed to the lower end surface of the crash can 9 by the bolt 16 corresponds to the compression deformation of each groove 9a. Each bead part 21 is compressed and deformed, and can be crushed in the longitudinal direction of the vehicle body. Therefore, the attachment portion 7 a can support the leg-pasting member 6 on the crash can 9 without hindering the absorption of collision energy by the crash can 9.

The support main body portion 7b is formed by bending the outer end in the vehicle width direction of the mounting portion 7a downward in the orthogonal direction, recessed inward in the vehicle width direction, and extending in the vertical direction. 22 (impact absorber) and the like. The support body portion 7b is formed to be curved so as to move to the front side as it goes downward from the attachment portion 7a.

The front bead portion 22 includes a curved portion 22a that continuously extends downward from the vehicle width direction outer side end portion of the front bead portion 21 and curves forward at the lower portion of the support main body portion 7b. Is formed up to the front end. The rear bead portion 22 includes a curved portion 22a that extends downward continuously from the vehicle width direction outer side end portion of the rear bead portion 21 and curves forward at the lower portion of the support main body portion 7b. The main body 7b is formed up to an intermediate position in the front-rear direction. The upper part of the front bead part 22 and the rear bead part 22 are extended substantially in the vertical direction, and the respective lower end parts are formed to substantially the same height in the vertical direction of the vehicle body.

The bead depth, bead width, etc. of each bead portion 22 are set so as to be able to absorb an impact load greater than the collision energy necessary for guiding the pedestrian onto the hood 2 at the time of collision with the pedestrian. . As described above, the impact load applied to the pedestrian at the time of collision can be reduced as much as possible, and the pedestrian can be effectively guided onto the hood 2.

The impact transmission portion 7c is formed by bending the lower end portion of the support main body portion 7b toward the vehicle body front side.
The front side portion of the lower end portion of the impact transmission portion 7 c is disposed in front of the front end portion of the bumper reinforcement 4. The impact transmission part 7c is provided with a pair of bolt holes 23 provided so as to be able to penetrate the impact transmission part 7c. The leg wiper member 6 is fastened and fixed to the support member 7 by a bolt 15 through a pair of bolt holes 23. Therefore, the left and right end portions of the leg wiping member 6 are disposed immediately below the vehicle width direction outer end portion of the crash can 9.

As shown in FIGS. 3 to 5, a synthetic resin under cover 17 is disposed below the front portion of the engine room E and covers the lower surface of the vehicle body. The under cover 17 extends from the lower end of the bumper face 5 to a position below the shroud drawer 13 that supports the lower portion of the radiator 8.
As shown in FIG. 7, a support bracket 18 that supports the center portion of the leg wiping member 6 at the center position in the vehicle width direction is disposed at the front end portion of the under cover 17.

The metal support bracket 18 has a substantially hat-shaped cross section. The support bracket 18 includes a connecting portion 18a on both the left and right sides for connecting to the under cover 17, a connecting portion 18b for connecting to the central portion of the leg-pasting member 6 between the left and right connecting portions 18a, and the like. The support bracket 18 is fixed to the upper surface of the under cover 17 by four bolts 24 through the connecting portion 18a, and the leg washer 6 is supported on the under cover 17 by the two bolts 25 through the connecting portion 18b. ing.

  As described above, when the vehicle V collides with a pedestrian, the center portion of the leg wiper member 6 is firmly supported by the under cover 17, so that the leg remover is based on the downward bending moment generated at the time of collision with the pedestrian. The movement of the central portion of the member 6 can be prevented. Therefore, at the time of the collision, the lower leg portion of the pedestrian can be reliably paid at the preset height position, and the pedestrian can be guided onto the hood 2.

Next, the deformation mode control by the front side frame 3 when the vehicle V collides will be described.
When a frontal collision of the vehicle V occurs, an impact load that is not absorbed by the bumper face 5 and the impact absorber 10 is transmitted to the crash can 9. This load is absorbed by crushing the groove 9 a of the crash can 9. The impact load that is not absorbed by the crushing deformation of the crash can 9 is input from the front end portion of the front side frame 3 and transmitted rearward.

  The impact load input to the front end portion of the front side frame 3 acts on the plurality of bead portions 3a, and the bending deformation of each bead portion 3a is started. At this time, since the bead portion 3a is formed in a recessed shape, the cross-sectional modulus of the front side frame 3 at this portion is smaller than the cross-sectional modulus of the front and rear portions thereof, and the bead portion 3a is a fold portion with respect to the vehicle width direction outside Become. As described above, the collision energy in the frontal collision is absorbed.

  Here, although the support member 7 is fixed to the crash can 9 by the attachment portion 7a, the front and rear two rows of bead portions 31 extending in the left-right direction corresponding to the respective groove portions 9a are provided. Each bead portion 31 is compressed and deformed in the longitudinal direction of the vehicle body in accordance with the compression deformation, and does not hinder the collision energy absorption of the crash can 9 at the initial stage of the collision.

Next, the pedestrian leg payment control by the leg payment member 6 will be described.
As shown in FIGS. 2 to 5, in the case of a collision with a pedestrian, the leg wiper member 6 is disposed near the rear of the introduction opening 5 c corresponding to the height of the lower leg portion of the pedestrian below the shock absorber 10. Therefore, the protrusion 6e collides with the lower leg portion of the pedestrian via the bumper face 5. The impact load input to the protruding portion 6e is absorbed by the crushing deformation of the protruding portion 6e or the upper surface portion 6a and the lower surface portion 6b.

The impact load that is not absorbed even by the crushing deformation of the leg disposing member 6 is transmitted from the impact transmitting portion 7c to the support main body portion 7b. The impact load input to the support main body portion 7b is absorbed by the deformation of the front and rear two rows of bead portions 32 extending in the vertical direction. When the impact load input to the support body portion 7b is small, the front portion of the front bead portion 32 is crushed and deformed to absorb the impact load. As the impact load increases, the area where the front bead portion 32 is deformed is expanded rearward and upward. The impact load that is not absorbed even by the crushing deformation of the front bead part 32 is absorbed by the crushing deformation of the rear bead part 32. In addition, when the leg-pasting member 6 is displaced upward, each bead part 32 is crushed and deformed, and when the leg-pasting member 6 is displaced downward, each bead part 32 is extended and deformed. Absorbs impact load.

As described above, when the pedestrian and the vehicle V collide, the protrusion 6e of the leg wiping member 6 collides with the lower leg of the pedestrian the earliest, so that the upper body of the pedestrian is connected to the bumper reinforcement 4 via the bumper face 5. A pedestrian can be effectively guided to the hood 2 by paying the lower leg of the pedestrian before the collision. And since the impact load more than the collision energy required in order to guide a pedestrian on the bonnet 2 is absorbed by the crushing deformation of each bead part 32, the impact load added to a pedestrian can be made low.

Here, since the leg-pasting member 6 is formed in a substantially arc shape recessed downward when viewed from the front, the pedestrian is guided onto the hood 2 on the center side in the vehicle width direction when colliding with the pedestrian. be able to. Therefore, when the pedestrian and the leg wiping member 6 collide at the outer end portion in the vehicle width direction, the pedestrian can be guided to the central portion in the vehicle width direction where the thickness of the shock absorber 10 is thick, and walking by the bumper reinforcement 4 is performed. Can be prevented from bottoming out.

Next, the operation and effect of the front body structure will be described.
The front body structure includes a pair of left and right front side frames 3 extending in the longitudinal direction of the vehicle body below the bonnet 2, and a bumper rain attached to the front end portions of the pair of front side frames 3 and extending in the vehicle width direction. The outer surface of the front portion of the vehicle body that is provided in front of the force force 4 and the bumper reinforcement 4 and that has a central portion in the vehicle width direction located at the foremost end in the vehicle longitudinal direction and curved toward the rear of the vehicle body in the vehicle width direction outer side portion And a leg-pasting member 6 extending in the vehicle width direction and disposed at a position lower than the pair of front side frames 3 and at the front end thereof in front of the bumper reinforcement 4. In the event of a collision between the vehicle V and the pedestrian, the pedestrian can be prevented from getting caught in the lower part of the vehicle body.
Moreover, since the crash can 9 is provided at the front end portions of the pair of front side frames 3, both the deformation mode control by the front side frames 3 and the leg-paying function can be achieved.

Since the leg-pasting member 6 is formed in a substantially arc shape recessed downward as viewed from the front so that the outer end portion in the vehicle width direction is located above the center portion in the vehicle width direction. Even in the case where the position of the leg-pasting member 6 is set low in the center portion, a space can be formed in the vehicle width direction left and right outside lower side, and the shape of the bumper face 5 is viewed in plan view in the vehicle width direction center. As compared with the portion, the outer portion in the vehicle width direction can be formed in a curved shape that is curved toward the rear of the vehicle body, and the degree of freedom in design can be increased.

Since the outer end portion in the vehicle width direction of the leg wiper member 6 is disposed at least directly below the outer end portion in the vehicle width direction of the crash can 9 disposed at the tip portion of the pair of left and right front side frames 3, The lower leg portion of the pedestrian can be paid over a wide range in the vehicle width direction across the front side frames 3, and the safety of the pedestrian during a collision can be ensured.

Since the leg-pasting member 6 is formed in a curved shape with a substantially uniform curvature so as to be smoothly curved upward from the vehicle width direction center portion to the vehicle width-direction outer end, the length of the leg-pasting member 6 is increased. The length can be shortened, and the weight of the vehicle body can be reduced. Moreover, when the lower leg portion of the pedestrian comes into contact with the leg wiper member 6, the pedestrian can be guided onto the hood 2 at the center in the vehicle width direction, and the bumper reinforcement 4 can cause the pedestrian to hit the bottom. Can be prevented.

A pair of left and right support members 7 for supporting the leg wiper member 6 is provided on the pair of crash cans 9, and the support main body portion 7 b of the support member 7 absorbs the impact load in the longitudinal direction of the vehicle body input to the leg wiper member 6. Since the front and rear two rows of bead portions 32 are provided, the leg-pasting member 6 can be reduced in size, and the weight of the vehicle body can be reduced. Moreover, since the leg-pasting member 6 and the bead portion 32 cooperate and absorb an impact load greater than the collision energy necessary for guiding the pedestrian onto the hood 2, the impact load applied to the pedestrian can be kept low. it can.

Since the support member 7 includes the front and rear two rows of bead portions 31 that allow deformation of the crash can 9 in the longitudinal direction of the vehicle body on the mounting portion 7a, the crash deformation of the crash can 9 is inhibited during a frontal collision of the vehicle V. Therefore, the collision energy can be reliably absorbed.

Since the lower cover 17 has an under cover 17 that covers the lower surface of the vehicle body, a support bracket 18 that supports the leg paying member 6 is formed at the front end of the center portion of the under cover 17 in the vehicle width direction. In the event of a collision with a pedestrian, a downward moment applied to the center portion of the leg wiping member 6 is supported by the under cover 17 so that the movement of the leg wiping member 6 is suppressed, and the lower leg of the pedestrian at an effective height position. Can pay the department.

Since the radiator 8 and the shroud drawer 13 that supports the radiator 8 are provided at the rear position of the leg-pasting member 6 between the pair of front side frames 3, the radiator 8 is disposed so as to be inclined forward in the front-rear direction of the vehicle body. In a low bonnet vehicle, it is possible to obtain a front vehicle body shape that is curved toward the rear of the vehicle body in the vehicle width direction outer portion as compared with the vehicle width direction center portion while ensuring a leg-paying function.

  Next, a front vehicle body structure for a vehicle according to Embodiment 2 will be described with reference to FIGS. Only the configuration different from the front vehicle body structure of the first embodiment will be described, and the same members as those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

The leg wiping member 6A (vehicle width direction member) has a lower position of the bumper reinforcement 4 and a front end located in front of the bumper reinforcement 4, that is, below the shock absorber 10 and the height of the lower leg of the pedestrian. It is arrange | positioned in the back vicinity of the introduction opening 5c corresponding to. The synthetic resin leg-pasting member 6A is formed in a substantially hat shape that is recessed downward as viewed from the front.

The leg cleaning member 6A is integrally formed by a central portion 6f, an outer end portion 6g that forms the left and right end portions of the leg cleaning member 6A, a rising portion 6h provided between the central portion 6f and the outer end portion 6g, and the like. It is configured. Similar to the first embodiment, the leg disposing member 6A includes an upper surface portion 6a, a lower surface portion 6b, a front surface portion 6c, a rear surface portion 6d, and the like, and has a solid structure extending in the vehicle width direction.

The central portion 6f is formed in a substantially linear shape so as to correspond to the width in the left-right direction of the radiator 8 when viewed from the front, and the height position in the up-down direction is in the vicinity of the rear of the lower opening edge of the introduction opening 5c. It is arranged to be. The left and right outer end portions 6g are formed in a substantially straight line shape from the left and right outer end portions of the leg-pasting member 6A in the vehicle width direction when viewed from the front, and the vertical height positions of the introduction opening 5b and the introduction opening 5c. It is arranged to be in the middle position.

The left and right rising portions 6h are formed to extend upward at the transition portions from the left and right end portions of the central portion 6f to the respective outer end portions 6g, and the upper end portion of the rising portion 6h is below the introduction opening 5b. It is comprised so that it may become below an opening edge part. As described above, the space portion can be formed outside the rising portion in the vehicle width direction.

Next, operations and effects of the front vehicle body structure according to the second embodiment will be described.
In this front body structure, a space where the bumper face 5 can be curved upward is formed on the outer side in the vehicle width direction of the rising portion. Compared to the central portion in the direction, the outer portion in the vehicle width direction can be curved toward the rear of the vehicle body, and the degree of freedom in design can be increased.

Further, since the outer end portion in the vehicle width direction of the leg wiper member 6A is disposed at a position immediately below at least the outer end portion in the vehicle width direction of the crash can 9 disposed at the tip portion of the pair of left and right front side frames 3, The lower leg portion of the pedestrian can be paid over a wide range in the vehicle width direction across the left and right front side frames 3, and the safety of the pedestrian during a collision can be secured. The outer end in the vehicle width direction is provided to a position directly below the front side frame 3 and is located closer to the bumper reinforcement 4 than the center in the vehicle width direction. Can be suppressed more than the central portion in the vehicle width direction, and the distance from the face 5 to the outer end portion in the vehicle width direction of the bumper reinforcement 4 can be reduced by the curved shape of the bumper face 5. The bottoming of the bumper reinforcement 4 of cormorants pedestrian can be prevented.

Next, based on FIG. 10, a modified example of the crush can 9 integrally formed with the support member 7 that supports the leg wiper member 6 will be described. Only the configuration different from the crash can 9 of the embodiment will be described, and the same members as those of the embodiment are denoted by the same reference numerals and the description thereof is omitted. Since the pair of left and right crash cans have the same configuration, the right crash can will be described.

As shown in FIG. 10, the crash can 9 </ b> A includes an upper panel 26 and a lower panel 27. The panels 26 and 27 extend in the longitudinal direction of the vehicle body and form a cross-shaped closed cross section when viewed from the front. The upper panel 26 includes a vertical surface portion 26a on the inner side in the vehicle width direction, a horizontal plane portion 26b that connects an upper end portion of the vertical surface portion 26a and a lower end portion of the vertical surface portion 26c, an outer end portion of the horizontal plane portion 26b, and a horizontal plane portion 26d. The vertical surface portion 26c that connects the inner end portions, the horizontal surface portion 26d that connects the upper end portion of the vertical surface portion 26c and the upper end portion of the vertical surface portion 26e, the outer end portion of the horizontal surface portion 26d and the inner end portion of the horizontal surface portion 26f. The vertical surface portion 26e, the horizontal surface portion 26f connecting the lower end portion of the vertical surface portion 26e and the upper end portion of the vertical surface portion 26g, the vertical surface portion 26g extending downward from the outer end portion of the horizontal surface portion 26f, and the like. .

The horizontal plane portion 26f is formed with two rows of front and rear bead portions 26h that go straight in the longitudinal direction of the vehicle body and are recessed into the crash can 9A. The vertical surface portion 26g is formed with two rows of front and rear bead portions 26i that are continuous with the respective bead portions 26h and are recessed inward in the vehicle width direction and extending from the upper end to the lower end.

The lower panel 27 includes a vertical surface portion 27a on the inner side in the vehicle width direction, a horizontal plane portion 27b connecting the lower end portion of the vertical surface portion 27a and the upper end portion of the vertical surface portion 27c, an outer end portion of the horizontal plane portion 27b, and an inner side of the horizontal plane portion 27d. A vertical surface portion 27c connecting the end portions, a horizontal surface portion 27d connecting the lower end portion of the vertical surface portion 27c and the lower end portion of the vertical surface portion 27e, an outer end portion of the horizontal surface portion 27d and an inner end portion of the horizontal surface portion 27f. Are formed by a vertical surface portion 27e that connects the upper end portion of the vertical surface portion 27e and the lower end portion of the vertical surface portion 27g, a vertical surface portion 27g that extends upward from the outer end portion of the horizontal surface portion 27f, and the like. ing. The closed cross-sectional portion extending in the front-rear direction of the crash can 9A is formed by welding the vertical surface portion 26a and the vertical surface portion 27a and welding the vertical surface portion 26g and the vertical surface portion 27g.

  The support member 7A is integrally formed with the crash can 9A by extending the lower end portion of the vertical surface portion 26g downward. The support member 7A includes a support main body portion 7d and an impact transmission portion 7e. The support body portion 7d is formed with two front and rear rows of bead portions 28 (impact absorbing portions) that are recessed inward in the vehicle width direction and extend in the vertical direction.

The front bead portion 28 is connected to the lower end of the front bead portion 26i, extends downward, curves forward at the lower portion of the support body portion 7d, and extends to the front end portion of the support body portion 7d. The rear bead portion 28 is connected to the lower end of the rear bead portion 26i and extends downward, and is curved forward at the lower portion of the support body portion 7d. The bead depth, bead width, etc. of each bead portion 28 are set so as to be able to absorb an impact load greater than the collision energy necessary for guiding the pedestrian onto the hood 2 at the time of collision with the pedestrian. .

The impact transmission portion 7e is formed by extending the lower end portion of the support main body portion 7d downward. The impact transmission portion 7e includes a pair of bolt holes 29. The leg wiper member 6 disposed on the inner surface in the vehicle width direction of the support main body portion 7d is fixed to the support member 7A by a bolt (not shown) from the outer side in the vehicle width through a pair of bolt holes 29.

As described above, since the support member 7A capable of supporting the leg cleaning member 6 is integrally formed by extending the vertical surface portion 26g of the crash can 9A downward, the mounting portion of the support member 7A to the crash can 9A is omitted. Thus, the weight of the vehicle body can be reduced and the crushing deformation control of the crash can 9A can be facilitated.

Next, a modification of the undercover will be described based on FIG. Only the configuration different from the under cover 17 of the embodiment will be described, and the same members as those of the embodiment are denoted by the same reference numerals and the description thereof will be omitted.

The under cover 17A is formed in a substantially rectangular shape with a concave portion in the rear portion when viewed in a plan view. The under cover 17A made of synthetic resin includes a central portion 17a extending from the front end portion to the rear end portion in the vehicle width direction central portion, and a pair of left and right side portions integrally formed on the left and right sides of the central portion 17a. 17b and the like.

The central portion 17a is formed of fiber reinforced plastic (FRP) in which glass fiber is mixed with synthetic resin. The length of the central portion 17 a in the vehicle width direction is set so that the support bracket 18 that supports the central portion of the leg wiping member 6 can be fixed by the bolt 24.

As described above, the support strength in the longitudinal direction of the vehicle body of the central portion 17a to which the support bracket 18 is fixed can be increased. Therefore, the downward moment applied to the center part of the leg piercing member 6 can be firmly supported at the time of a collision with a pedestrian, and the movement of the leg piercing member 6 accompanying the collision can be reliably suppressed.

Next, a modification in which the above embodiment is partially changed will be described.
1) In the above-described embodiment, the example in which the leg-pasting member is formed of a synthetic resin has been described. However, at least when the pedestrian collides with the pedestrian, it is sufficient that the pedestrian can be guided on the hood and is formed of a metal such as a steel plate. It is also possible to achieve the same effect. It is also possible to use a leg member formed of a different material for each part.

2) In the above-described embodiment, the example in which the impact transmission unit transmits the impact load in the longitudinal direction of the vehicle body to the support body portion has been described. However, it is sufficient that at least the impact load can be absorbed by the support member. It is also possible to provide an impact absorbing portion such as a bead portion that can absorb the impact load.

3) In the above embodiment, the example in which the left and right rising portions are formed to rise substantially upward at the transition portions from the left and right end portions of the central portion to the respective outer end portions has been described. However, the rising portions are directed upward. It may be formed so as to be gently inclined, or may be formed in a curved shape.

4) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention provides a vehicle having a vehicle width direction member that pays the lower leg portion of a pedestrian at the lower side of the front side frame and at the front side of the bumper reinforcement in a plan view of the shape of the bumper face while ensuring the leg payment function. As compared with the central portion in the vehicle width direction, the outer portion in the vehicle width direction can be formed into a curved shape that curves toward the rear of the vehicle body.

V Vehicle 1 Front car body 2 Bonnet 3 Front side frame 4 Bumper reinforcement 5 Bumper face 6, 6A Leg washer 6f Center part 6g Outer end part 6h Rising part 7, 7A Support member 8 Radiator 9, 9A Crash can 13 Shroud Lower 17, 17A Under cover 22, 28 Bead part

Claims (7)

A pair of left and right front side frames extending in the longitudinal direction of the vehicle body below the bonnet, a bumper reinforcement attached to the front ends of the pair of front side frames and extending in the vehicle width direction, and the bumper reinforcement And a pair of the bumper faces that form the outer surface of the front portion of the vehicle body that is located forward and the center portion in the vehicle width direction is located at the foremost end in the vehicle longitudinal direction and that the outer portion in the vehicle width direction is curved toward the rear of the vehicle body, In a vehicle front body structure including a vehicle width direction member that extends in the vehicle width direction and is positioned lower than the front side frame and has a front end disposed in front of the bumper reinforcement.
The vehicle body structure according to claim 1, wherein the vehicle width direction member is formed such that an outer end portion in the vehicle width direction is positioned above a center portion in the vehicle width direction.   2. The front body structure of a vehicle according to claim 1, wherein an outer end portion in the vehicle width direction of the vehicle width direction member is disposed at a position directly below at least the pair of front side frames.   3. The vehicle according to claim 1, wherein the vehicle width direction member is formed to be smoothly curved upward from a vehicle width direction center portion to an outer end portion in the vehicle width direction. Front body structure. The vehicle front body according to claim 1 or 2, wherein the vehicle width direction member includes a rising portion extending upward at a transition portion from a vehicle width direction central portion to a vehicle width direction outer end portion. Construction.   A pair of left and right support members for supporting the vehicle width direction member is provided on the pair of front side frames, and the pair of support members absorbs an impact load in the vehicle front-rear direction input to the vehicle width direction member. The front vehicle body structure of the vehicle according to any one of claims 1 to 4, further comprising a possible impact absorbing portion. An under cover that covers the lower surface of the vehicle body is provided below the vehicle width direction member, and a support portion that supports the vehicle width direction member is provided at a front end portion of a vehicle width direction center portion of the under cover. The front body structure of a vehicle according to any one of claims 1 to 5. A heat exchanger and a shroud that supports the heat exchanger are provided at a rear position of the vehicle width direction member between the pair of front side frames, and the heat exchanger is inclined forward in the front-rear direction of the vehicle body. The vehicle front body structure according to any one of claims 1 to 6, wherein the vehicle front body structure is arranged as described above.