JP2010083453A - Vehicle front body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle front body structure favorably absorbing the impact load by uniformly ensuring the deformation of an extension member. <P>SOLUTION: In the vehicle front body structure 10, an inner extension member 41 is projected with a fitting plate 35 being interposed on a left front side frame 11. The inner extension member 41 has an inner cylindrical body 61 and an inner front lid part 67. The inner front lid part 67 has an upper wall fixing flap 71, a lower wall fixing flap 72, an inner sidewall fixing flap 73, and an outer sidewall fixing flap 74 to be welded to an upper wall 62, a lower wall 63, an inner sidewall 64, and an outer sidewall 65, respectively. Flap edges 71a-74a of the fixing flaps are separated from the fitting plates 35 by the same distance S2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body front portion structure in which an extension member protrudes from the front end portion of a front side frame toward the front of the vehicle body.

In the vehicle body front structure, an upper member is provided on the outer side in the vehicle width direction of the front side frame, and an inner and outer shock absorbing portion (hereinafter referred to as an “extension member”) is provided at each front end portion so as to be separated in the vehicle width direction. In some cases, a bumper beam is provided at the front end of the inner and outer extension members (see, for example, Patent Document 1).
JP 2007-190964 A

  In the vehicle body front part structure of Patent Document 1, a mounting plate is bridged between the front end portions of the front side frame and the upper member, and inner and outer extension members are provided on the mounting plate.

The inner extension member protrudes from the front end portion of the front side frame toward the front of the vehicle body. The outer extension member protrudes from the front end portion of the upper member toward the front of the vehicle body.
Attachment holes are formed in the front end portions of the inner and outer extension members, and bumper beams are attached with bolts inserted into the respective attachment holes.

  According to the vehicle body front structure, when an impact load acts on the bumper beam from the front of the vehicle body, it is possible to deform (crush) the inner extension member or the outer extension member to absorb the impact load.

Here, in the vehicle body front part structure, the inner and outer extension members are provided with inner and outer cylinders projecting toward the front of the vehicle body, and the front end part of the inner and outer cylinders are respectively covered with the lid parts. is there.
In this vehicle body front structure, attachment holes are formed in the respective lid parts, and bumper beams are attached with bolts inserted into the attachment holes.

The lid body portion is provided with a plurality of flaps projecting to the rear of the vehicle body along the cylinder body, and the plurality of flaps are welded to the cylinder body so as to be provided at the front end portion of the cylinder body.
The portion where the flaps are welded and overlapped increases in thickness and becomes difficult to deform with respect to impact load.
For this reason, it is difficult to ensure a uniform deformation amount (crush amount) of the inner and outer extension members, and it is difficult to absorb the impact load well.

  It is an object of the present invention to provide a vehicle body front structure that can ensure a uniform deformation amount of an extension member and absorb an impact load satisfactorily.

  In the first aspect of the invention, the front side frame extends in the longitudinal direction of the vehicle body, a mounting plate is provided at the front end of the front side frame, and an extension member projects from the mounting plate toward the front of the vehicle body. In the vehicle body front structure, the extension member includes a cylindrical body formed in a cylindrical shape with an upper wall, a lower wall, an inner wall, and an outer wall, and a front lid portion that closes a front end portion of the cylindrical body, The front lid portion includes an upper wall fixing flap, a lower wall fixing flap, an inner wall fixing flap, and an outer wall fixing flap that can be welded to the upper wall, the lower wall, the inner wall, and the outer wall, respectively. The fixed flap, the lower wall fixed flap, the inner wall fixed flap, and the outer wall fixed flap are separated from each other by the same distance with respect to the mounting plate. It is characterized in.

  According to a second aspect of the present invention, the mounting plate is tilted forward so that the mounting plate is tilted forward of the vehicle body toward the center in the vehicle width direction, and a front bulkhead that mounts a cooling member on the vehicle width direction center side of the mounting plate is disposed. A front bulkhead is provided on the mounting plate.

  According to a third aspect of the present invention, the cylindrical body is bent in a substantially U-shaped cross section, the inner wall and an inner plate having upper and lower bent portions, and the outer wall is bent in a substantially U-shaped cross section. And an outer plate having upper and lower bent portions, and each upper bent portion of the inner plate and the outer plate is overlapped to form the upper wall, and each lower fold of the inner plate and the outer plate is formed. The curved portion is overlapped to form the lower wall, and a reinforcing bead is extended on the inner wall and the outer wall in the longitudinal direction of the vehicle body.

In the invention according to claim 1, the extension member includes the front lid portion that closes the front end portion of the cylindrical body. The front lid portion was provided with an upper wall fixing flap, a lower wall fixing flap, an inner wall fixing flap, and an outer wall fixing flap that can be welded to the upper wall, the lower wall, the inner wall, and the outer wall, respectively.
And each flap edge of each fixed flap was spaced apart by the same distance with respect to the attachment plate.
Thereby, the deformation amount (crushing amount) of the extension member can be ensured uniformly, and the impact load can be absorbed well.

  In the invention according to claim 2, the mounting plate is inclined forward so as to incline forward of the vehicle body toward the center in the vehicle width direction. Accordingly, the front end portion of the front side frame can be extended to the front side of the vehicle body, and the front bulkhead provided at the front end portion of the front side frame can be moved to the front side of the vehicle body.

Accordingly, a cooling member such as a radiator supported by the front bulkhead can be provided by moving it to the front side of the vehicle body.
Therefore, in a vehicle in which the overall length of the vehicle body is kept compact, the engine room can be secured largely toward the front of the vehicle body, and a large engine can be mounted.

In the invention according to claim 3, two upper bent portions of the inner and outer plates are overlapped to form an upper wall of the cylinder, and two lower bent portions of the inner and outer plates are overlapped to overlap the cylindrical body. A lower wall was formed.
Further, reinforcing beads were extended on the inner and outer walls of the cylinder in the longitudinal direction of the vehicle body.

By extending the beads to the inner and outer walls, the rigidity of the inner and outer walls can be matched to the upper and lower walls.
Thus, by combining the rigidity of the inner wall, the outer wall, the upper wall, and the lower wall, it is possible to evenly secure the deformation amount (crush amount) of the extension member and absorb the impact load well.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that “front”, “rear”, “left”, and “right” indicate the direction viewed from the driver, the front side is Fr, the rear side is Rr, the left side is L, and the right side is R.

FIG. 1 is a perspective view showing a vehicle body front structure according to the present invention. In FIG. 1, the power source is removed in order to facilitate understanding of the configuration of the vehicle body front structure.
The vehicle body front structure 10 includes left and right front side frames (front side frames) 11 and 12 on the left and right sides of the vehicle body front portion, and a left upper member (upper member) 13 on the outer side in the vehicle width direction of the left front side frame 11. A right upper member (upper member) 14 is provided on the outer side of the right front side frame 12 in the vehicle width direction, and a left impact absorbing unit 16 is provided at the front end portion 11a of the left front side frame 11 and the front end portion 13a of the left upper member 13. The right front side frame 12 has the front end portion 12a and the front end portion 14a of the right upper member 14 provided with a right shock absorbing unit 17, and the left and right shock absorbing units 16 and 17 have bumper beams 18 bridged.

  The vehicle body front structure 10 further includes a power source 22 (see FIGS. 2 and 3) in a space (engine room) 21 between the left and right front side frames 11 and 12, and a front bulkhead 24 in front of the power source 22. The front bulkhead 24 is provided with a cooling member 26 such as a radiator.

FIG. 2 is a perspective view showing the main part of the vehicle body front structure according to the present invention, and FIG. 3 is a plan view showing the main part of the vehicle body front structure according to the present invention.
As an example, the power source 22 is a unit in which an engine and a transmission are integrally combined, the engine is disposed on the right front side frame 12 (see FIG. 1) side, and the transmission is disposed on the left front side frame 11 side. Yes.
In the power source 22, the transmission is attached to the left front side frame 11 with a left mount member 23, and the engine is attached to the right front side frame 12 with a right mount member (not shown).

The left front side frame 11 extends in the longitudinal direction of the vehicle body, and the rear end portion 11b is connected to the left outrigger 27 (see FIG. 1).
The left upper member 13 is provided on the outside of the left front side frame 11 and extends upwardly toward the rear of the vehicle body. The rear end 15b is connected to the left front pillar 28 (see FIG. 1).

The front end 11 a of the left front side frame 11 is connected to the front end 13 a of the left upper member 13 by a front connection portion 31.
A left wheel house 32 that covers a left front wheel (not shown) is provided between the left front side frame 11 and the left upper member 13.

Here, the left and right front side frames 11 and 12 and the left and right upper members 13 and 14 are symmetrical members. The left front side frame 11 and the left upper member 13 will be described below. Description of the upper member 14 is omitted.
The left and right shock absorbing units 16 and 17 are symmetrical members. The left shock absorbing unit 16 will be described below, and the description of the right shock absorbing unit 17 will be omitted.

4 is an exploded perspective view showing a vehicle body front part structure according to the present invention, and FIG. 5 is an enlarged view of part 5 of FIG.
The left impact absorbing unit 16 includes a support plate 34 provided across the front end portion 11a of the left front side frame 11 and the front end portion 13a of the left upper member 13, a mounting plate 35 provided on the support plate 34, and a mounting plate. An inner extension member (extension member) 41 and an outer extension member 42 provided in 35 are provided.

  In the left impact absorbing unit 16, the inner extension member 41 protrudes from the front end portion 11 a (specifically, the mounting plate 35) of the left front side frame 11 toward the front of the vehicle body, and the outer extension member 42 extends from the left upper member 13. The front end portion 13a (specifically, the mounting plate 35) protrudes toward the front of the vehicle body.

The outer shape of the support plate 34 is formed in a substantially rectangular shape, and is provided at the front end portion 11 a of the left front side frame 11, the front end portion 13 a of the left upper member 13, and the front connection portion 31.
That is, the support plate 34 is provided across the front end portion 11 a of the left front side frame 11 and the front end portion 13 a of the left upper member 13.

  The support plate 34 includes an inner support portion 45 provided at the front end portion 11 a of the left front side frame 11 and an outer support portion 46 provided at the front end portion 13 a of the left upper member 13.

The outer support portion 46 is provided substantially parallel to a vehicle width direction straight line 48 extending in the vehicle width direction.
The inner support portion 45 is inclined forward so as to incline forward from the center portion 34a of the support plate 34 toward the vehicle width direction center.
Specifically, the inner support portion 45 is inclined forward so as to be inclined at an inclination angle θ1 with respect to the vehicle width direction straight line 48.
In addition, the inner support portion 45 has an inner end portion 45 a projecting substantially parallel to the vehicle width direction straight line 48.

The attachment plate 35 is attached to the front surface of the support plate 34 with bolts 37... 109, so that the attachment plate 35 is placed on the front surface of the support plate 34.
The attachment plate 35 is a plate formed in substantially the same outer shape (that is, substantially rectangular shape) as the support plate 34.

The mounting plate 35 is provided across the front end portion 11 a of the left front side frame 11 and the front end portion 13 a of the left upper member 13 with the support plate 34 interposed therebetween.
The mounting plate 35 includes an inner mounting portion 51 provided on the front surface of the inner support portion 45 and an outer mounting portion 52 provided on the front surface of the outer support portion 46.

The outer mounting portion 52 is provided substantially parallel to the vehicle width direction straight line 48, similarly to the outer support portion 46.
Like the inner support portion 45, the inner attachment portion 51 is inclined forward so as to incline forward from the center portion 35a of the attachment plate 35 toward the vehicle width direction center.
Specifically, the inner attachment portion 51 is inclined forward so as to be inclined at an inclination angle θ1 with respect to the vehicle width direction straight line 48.
In addition, the inner mounting portion 51 includes a stepped portion 53 provided at the inner end portion 51 a and a clamping piece 54 provided at the stepped portion 53.

The step portion 53 is a portion bent toward the front of the vehicle body at the inner end 51 a of the inner attachment portion 51.
The sandwiching piece 54 protrudes from the front side of the stepped portion 53 toward the center in the vehicle width direction substantially parallel to the inner end portion 45 a of the inner support portion 45.

By forming the stepped portion 53 and the sandwiching piece 54 at the inner end portion 51 a, the sandwiching piece 54 is arranged at a predetermined interval S 1 with respect to the inner end portion 45 a of the inner support portion 45.
Therefore, it is possible to secure a gap between the holding piece 54 and the inner end portion 45a for holding the mounting piece 107 of the rear flange 106 described later.
The reason why the attachment piece 107 of the rear flange 106 is sandwiched between the clamping piece 54 and the inner end 45a will be described in detail later.

6 is an exploded perspective view showing the left shock absorbing unit of the vehicle body front structure according to the present invention, FIG. 7 is a perspective view showing the inner cylinder body and the outer cylinder body of the left shock absorbing unit according to the present invention, and FIG. It is a perspective view which shows the inner front cover part and the outer front cover part of the left shock absorption unit which concern on invention.
An inner extension member 41 and an outer extension member 42 are provided on the mounting plate 35, respectively.
The inner extension member 41 includes an inner cylindrical body (cylindrical body) 61 formed in a substantially rectangular cylindrical shape by an upper wall 62, a lower wall 63, an inner side wall 64, and an outer wall 65, and a front end portion 61a of the inner cylindrical body 61. And an inner front lid portion (front lid portion) 67 for closing the door.
The inner wall 64 is a wall provided on the center side in the vehicle width direction.
The outer side wall 65 is a wall portion provided on the outer side in the vehicle body width direction (that is, on the outer extension member 42 side).

  The inner cylinder 61 has an upper wall 62 and a lower wall 63 projecting substantially horizontally toward the front of the vehicle body in a side view, and an inner wall 64 and an outer wall 65 gradually tapering toward the front of the vehicle body in a plan view. It is overhanging.

The inner cylinder 61 includes an inner plate 111 provided on the center side in the vehicle width direction and an outer plate 112 provided on the outer side in the vehicle width direction.
The inner plate 111 has an inner wall 64, an upper bent portion 113, and a lower bent portion 114 (see FIG. 7) by being bent into a substantially U-shaped cross section.
The outer plate 112 has an outer wall 65, an upper bent portion 115, and a lower bent portion 116 (see FIG. 7) by being bent into a substantially U-shaped cross section.

The upper bent portion 113 of the inner plate 111 and the upper bent portion 115 of the outer plate 112 are overlapped, and the respective upper bent portions 113, 115 are spot-welded at the upper joint portions 117, so that the inner cylindrical body 61 is formed. An upper wall 62 is formed.
Further, the lower bent portion 114 of the inner plate 111 and the lower bent portion 116 of the outer plate 112 are overlapped, and the lower bent portions 114, 116 are spot welded at the lower joint portion 118, whereby the inner cylindrical body 61. A lower wall 63 is formed.

  In this manner, the inner tube 61 is formed by the inner plate 111 and the outer plate 112 by bonding the upper bent portions 113 and 115 and the lower bent portions 114 and 116 together.

Here, the rigidity of the upper wall 62 is higher than that formed by a single plate by overlapping and joining the upper bent portions 113 and 115 to each other.
Further, the lower bent portions 114 and 116 are overlapped and joined to each other so that the rigidity of the lower wall 63 is higher than that formed by a single plate.

On the other hand, the inner cylindrical body 61 has a reinforcing inner bead 121 extending from the inner side wall 64 in the longitudinal direction of the vehicle body.
The inner bead 121 is a recess (groove) that extends parallel to the longitudinal direction of the vehicle body at the center of the inner wall 64 in the height direction.
In the inner bead 121, the groove bottom portion of the inner bead 121 is formed in an upward slope so that the bead depth dimension gradually decreases toward the front of the vehicle body.

Furthermore, a reinforcing outer bead (bead) 122 is extended to the outer wall 65 in the longitudinal direction of the vehicle body.
Similar to the inner bead 121, the outer bead 122 is a recess (groove) that extends in parallel to the longitudinal direction of the vehicle body at the center of the outer wall 65 in the height direction.
In the outer bead 122, the groove bottom portion of the outer bead 122 is formed in an upward slope so that the bead depth dimension gradually decreases toward the front of the vehicle body.

By extending the inner bead 121 to the inner wall 64 and the outer bead 122 to the outer wall 65, the rigidity of the inner wall 64 and the outer wall 65 can be increased according to the upper wall 62 and the lower wall 63. .
Accordingly, the rigidity of the four walls of the inner wall 64, the outer wall 65, the upper wall 62, and the lower wall 63 can be matched, and the deformation amount (smashing amount) of the inner cylinder 61 (that is, the inner extension member 41) can be reduced. It can be ensured evenly and the impact load can be absorbed well.

  The inner front lid portion 67 includes a front wall 68 that closes the front end portion 61a of the inner cylindrical body 61, an upper wall fixing flap 71, a lower wall fixing flap 72, and an inner wall fixing flap 73 that project from the front wall 68 to the rear of the vehicle body. An outer wall fixing flap 74 is provided.

The upper wall fixing flap 71 protrudes along the upper wall 62 from the upper end 68a of the front wall 68 toward the rear of the vehicle body, and is fixed to the upper wall 62 by welding.
The upper wall fixing flap 71 is fixed to the upper wall 62 by spot welding to the upper wall 62 at the upper flap joint portions 124 and 124.

The lower wall fixing flap 72 projects from the lower end 68b of the front wall 68 toward the rear of the vehicle body along the lower wall 63, and is fixed to the lower wall 63 by welding.
The lower wall fixing flap 72 is fixed to the lower wall 63 by spot welding to the lower wall 63 at the lower flap joints 125 and 125.

The inner wall fixing flap 73 projects along the inner wall 64 from the inner end 68c of the front wall 68 toward the rear of the vehicle body, and is fixed to the inner wall 64 by welding.
The outer side wall fixing flap 74 projects from the outer end 68d of the front wall 68 toward the rear of the vehicle body along the outer wall 65, and is fixed to the outer wall 65 by welding.
Thereby, the inner front lid portion 67 is fixed to the front end portion 61a of the inner cylindrical body 61 by welding.
In this state, the front wall 68 of the inner front lid portion 67 is tilted forward so as to tilt forward of the vehicle body toward the center in the vehicle width direction (see FIG. 5).

The upper wall fixing flap 71, the lower wall fixing flap 72, the inner wall fixing flap 73, and the outer wall fixing flap 74 have the same distance S2 with respect to the mounting plate 35 at the respective flap edge edges 71a, 72a, 73a, 74a (see FIG. 5)).
The reason why the flap end edges 71a to 74a of the fixed flaps 71 to 74 are separated from the mounting plate 35 by the same distance will be described later.

The outer extension member 42 is a member whose projection amount is suppressed to be small with respect to the inner extension member 41.
Similar to the inner cylinder 61 of the inner extension member 41, the outer extension member 42 is an outer cylinder 81 formed into a substantially rectangular cylindrical shape with the upper wall 82, the lower wall 83, the inner wall 84, and the outer wall 85. And an outer front lid portion 87 that closes the front end portion 81 a of the outer cylindrical body 81.
The inner wall 84 is a wall portion provided on the vehicle width direction center side (that is, the inner extension member 41 side).
The outer side wall 85 is a wall portion provided on the outer side in the vehicle body width direction.

  In the outer cylinder 81, the upper wall 82 and the lower wall 83 project substantially horizontally toward the front of the vehicle body in a side view, and the inner wall 84 and the outer wall 85 gradually taper toward the front of the vehicle body in a plan view. It is overhanging.

The outer cylinder 81 includes an inner plate 131 provided on the vehicle width direction center side and an outer plate 132 provided on the vehicle width direction outer side.
The inner plate 131 has an inner wall 84, an upper bent portion 133, and a lower bent portion 134 by being bent into a substantially U-shaped cross section.
The outer plate 132 has an outer wall 85, an upper bent portion 135, and a lower bent portion 136 by being bent into a substantially U-shaped cross section.

The upper bent portion 133 of the inner plate 131 and the upper bent portion 135 of the outer plate 132 are overlapped, and the respective upper bent portions 133, 135 are spot welded at the upper joint portions 137. An upper wall 82 is formed.
Further, the lower bent portion 134 of the inner plate 131 and the lower bent portion 136 of the outer plate 132 are overlapped, and the respective lower bent portions 134 and 136 are spot-welded at the lower joint portion 138 (only one portion is shown). Thus, the lower wall 83 of the inner cylinder 81 is formed.

  As described above, the upper bent portions 133 and 135 are joined together and the lower bent portions 134 and 136 are joined together, so that the outer cylindrical body 81 is formed by the inner plate 131 and the outer plate 132.

  The outer front cover 87 includes a front wall 88 that covers the front end 81a of the outer cylinder 81, an upper wall fixing flap 91, a lower wall fixing flap 92, and an inner wall fixing flap 93 that project from the front wall 88 to the rear of the vehicle body. An outer wall fixing flap 94 is provided.

The upper wall fixing flap 91 projects from the upper end portion 88a of the front wall 88 toward the rear of the vehicle body along the upper wall 82, and is fixed to the upper wall 82 by welding.
The upper wall fixing flap 91 is fixed to the upper wall 82 by spot welding to the upper wall 82 at the upper flap joint portions 144 and 144.

The lower wall fixing flap 92 projects from the lower end portion 88b of the front wall 88 toward the rear of the vehicle body along the lower wall 83, and is fixed to the lower wall 83 by welding.
The lower wall fixing flap 92 is fixed to the lower wall 83 by spot welding to the lower wall 83 at the lower flap joints 145 and 145.

The inner side wall fixing flap 93 projects from the inner end 88c of the front wall 88 toward the rear of the vehicle body along the inner side wall 84, and is fixed to the inner side wall 84 by welding.
The outer side wall fixing flap 94 projects from the outer end 88d of the front wall 88 toward the rear of the vehicle body along the outer wall 85 and is fixed to the outer wall 85 by welding.
Thereby, the outer front cover part 87 is being fixed to the front-end part 81a of the outer side cylinder 81 by welding.

Returning to FIG. 5, in the inner extension member 41, the inner end portion 68 c of the front wall 68 of the inner front lid portion 67 protrudes forward of the vehicle body with respect to the outer end portion 68 d.
Therefore, the inner extension member 41 is tilted forward so that the front wall 68 of the inner front lid portion 67 tilts forward from the outer end 68d to the inner end 68c of the front wall 68 toward the vehicle width direction center. ing.
Specifically, the front wall 68 is inclined forward so as to be inclined at an inclination angle θ2 with respect to the straight line 48 in the vehicle width direction.

The inclination angle θ2 is set to be slightly larger than the inclination angle θ1 of the inner mounting portion 51 in order to match the shape of the bumper beam 18.
Therefore, the front wall 68 of the inner front lid portion 67 is disposed substantially parallel to the inner attachment portion 51.

Upper and lower mounting holes 77 (see FIG. 8) through which upper and lower bolts (fastening members) 76 can be inserted are formed in the front wall 68.
Bolts 76 are respectively inserted into the upper and lower mounting holes 77, and the inserted bolts 76 are screwed to the nuts 78, whereby the left end portion 18 a of the bumper beam 18 is bolted to the inner front lid portion 67.

Here, the front wall 68 is disposed substantially parallel to the inner mounting portion 51 by tilting the inner mounting portion 51 of the mounting plate 35 forward and tilting the front wall 68 of the inner front lid portion 67 forward. Yes.
By arranging the front wall 68 and the inner attachment portion 51 substantially in parallel, the inner wall 64 and the outer wall 65 of the inner extension member 41 protrude from the inner attachment portion 51 by substantially the same amount.

Further, the upper wall fixing flap 71, the lower wall fixing flap 72 (see FIG. 8), the inner wall fixing flap 73, and the outer wall fixing flap 74 have respective flap edge edges 71a, 72a (see FIG. 8), 73a, 74a. The mounting plate 35 is separated by the same distance S2.
The reason why the flap end edges 71a to 74a are separated from the mounting plate 35 by the same distance S2 is as follows.

  That is, in the inner extension member 41, the upper wall fixing flap 71, the lower wall fixing flap 72 (see FIG. 8), the inner wall fixing flap 73, and the outer wall fixing flap 74 are superimposed on the front end portion 61a of the inner cylinder 61. .

For this reason, the front end portion 61a on which the respective fixing flaps 71 to 74 are overlapped is a portion that is relatively difficult to be deformed (not easily crushed) against an impact load acting from the front of the vehicle body.
For this reason, it is preferable to comprise so that the site | part on which each fixed flap 71-74 is not piled up may be deform | transformed uniformly (shattered) with an impact load.

Therefore, the flap edges 71a to 74a are separated from the mounting plate 35 by the same distance S2. Therefore, the deformation amount (crush amount) of the inner extension member 41 can be ensured uniformly.
Thereby, when an impact load is applied to the inner extension member 41, the inner cylindrical body 61 of the inner extension member 41 can be uniformly deformed (collapsed) over the entire region, and the impact load can be absorbed well. it can.

The outer extension member 42 is tilted forward so that the front wall 88 of the outer front lid portion 87 tilts forward from the outer end 88d to the inner end 88c of the front wall 88 toward the vehicle width direction center. .
Specifically, the front wall 88 is inclined forward so as to be inclined at an inclination angle θ3 with respect to the vehicle width direction straight line 48.

The inclination angle θ3 of the front wall 88 is set to be approximately the same as the inclination angle θ2 of the inner front lid portion 67 (front wall 68) in order to match the shape of the bumper beam 18.
The front wall 88 is formed with upper and lower mounting holes 96 (see FIG. 8) through which the upper and lower bolts 76 can be inserted.

  Bolts 76 are respectively inserted into the upper and lower mounting holes 96, and the inserted bolts 76 are screwed to the nuts 97, whereby the left end portion 18 a of the bumper beam 18 is bolted to the outer front lid portion 87.

Returning to FIGS. 3 and 4, the front bulkhead 24 includes a cooling member (radiator or the like) 26 and is disposed on the center side in the vehicle width direction of the mounting plate 35.
Specifically, the front bulkhead 24 is located between the front end portions 11a and 12a of the left and right front side frames 11 and 12 (see FIG. 1 for the right frame 12 and the front end portion 12a) and to the front end portions 11a and 12a. It is a member that is disposed on the front side of the vehicle body and partitions the front portion of the engine room 21.

  The front bulkhead 24 includes an upper member 101 extending in the vehicle width direction, a lower member (not shown) provided below the upper member 101, and left upper portions of the upper member 101 and the lower member. The left stay portion 103 provided and the right stay portion 104 (see FIG. 1) provided at the right end of each of the upper member 101 and the lower member are formed in a substantially rectangular frame shape.

The left stay portion 103 includes a rear flange 106 protruding toward the mounting plate 35 at the rear portion 103a.
The rear flange 106 has an attachment piece 107 protruding toward the stepped portion 53 of the attachment plate 35, and the attachment piece 107 has an attachment hole 108.

As described above, the mounting piece 107 is a protruding piece that can be clamped between the clamping piece 54 of the inner mounting portion 51 and the inner end portion 45a of the inner support portion 45.
That is, the attachment piece 107 is attached by the bolt 109 in a state of being sandwiched between the holding piece 54 of the inner attachment portion 51 and the inner end portion 45 a of the inner support portion 45.
Therefore, the rear flange 106 is provided on the support plate 34 and the mounting plate 35.
Note that the left and right stay portions 103 and 104 are symmetrical members, and the left stay portion 103 will be described below and the description of the right stay portion 104 will be omitted.

The inner support portion 45 is tilted forward at an inclination angle θ1 and the inner mounting portion 51 is tilted forward at an inclination angle θ1, thereby moving the inner support portion 45 and the inner mounting portion 51 to the front side of the vehicle body. Can do.
Therefore, the attachment piece 107 of the rear flange 106 sandwiched between the holding piece 54 of the inner attachment portion 51 and the inner end portion 45a of the inner support portion 45 can be provided by being moved forward of the vehicle body.

Accordingly, the front bulkhead 24 can be provided by being moved to the position P1 (see also FIG. 5) on the front side of the vehicle body, and the cooling member 26 can be provided by being moved together with the front bulkhead 24 to the front side of the vehicle body.
Therefore, in a vehicle in which the overall length of the vehicle body is kept compact, the engine room 21 can be secured large toward the front of the vehicle body, and the large power source 22 can be mounted in the engine room 21.

In addition, by providing the rear flange 106 on the mounting plate 35, the cooling member 26 can be further moved forward along with the front bulkhead 24.
Thereby, in a vehicle in which the overall length of the vehicle body is kept compact, the engine room 21 can be secured further toward the front of the vehicle body.

Next, an example in which the opponent vehicle collides with the vehicle body front part structure 10 in an offset state will be described with reference to FIGS.
FIGS. 9A and 9B are diagrams for explaining an example in which an opponent vehicle has an offset collision with the vehicle body front structure according to the present invention.
In (a), the opponent vehicle 140 is offset to the left with respect to the vehicle body front structure 10 and is offset.
The impact load F1 generated by the offset collision is transmitted to the left impact absorbing unit 16 through the left end portion 18a of the bumper beam 18.

Specifically, a part of the impact load F1 is transmitted to the inner extension member 41 as the impact load F2 as indicated by an arrow.
Further, the remaining impact load F3 of the impact load F1 is transmitted to the outer extension member 42 as indicated by an arrow.

In (b), the inner cylinder 61 of the inner extension member 41 is deformed (crushed) with the impact load F2 applied to the inner extension member 41 to absorb a part of the impact load F2.
Furthermore, the outer cylindrical body 81 of the outer extension member 42 is deformed (collapsed) by the impact load F3 applied to the outer extension member 42 to absorb a part of the impact load F3.

Here, as described above, the inner support portion 45 is tilted forward at the tilt angle θ1 and the front wall 68 is tilted forward at the tilt angle θ2.
Therefore, the inner wall 64 (see FIG. 9A) of the inner extension member 41 and the outer wall 65 (see FIG. 9A) can have substantially the same protruding amount.

  Further, as shown in FIG. 5, the upper wall fixing flap 71, the lower wall fixing flap 72, the inner wall fixing flap 73, and the outer wall fixing flap 74 of the inner extension member 41 are respectively connected to the flap edges 71a, 72a, 73a, 74a is separated from the mounting plate 35 by the same distance S2.

In addition, as shown in FIG. 7, by extending the inner bead 121 to the inner wall 64 of the inner extension member 41 and the outer bead 122 to the outer wall 65, the rigidity of the inner wall 64 and the outer wall 65 is increased. Is raised in accordance with the upper wall 62 and the lower wall 63.
Therefore, the deformation amount (crushing amount) of the inner cylinder 61 (that is, the inner extension member 41) can be ensured uniformly.

For these reasons, when an impact load is applied to the inner extension member 41, the inner extension member 41 can be uniformly deformed (collapsed) over the entire region.
Therefore, a sufficient amount of impact load absorbed by the inner extension member 41 can be secured.

FIG. 10 is a view for explaining an example in which an impact load is supported by the vehicle body front structure according to the present invention.
After a part of the impact load F2 is absorbed by the inner extension member 41, the remaining impact load F4 of the impact load F2 is transmitted to the left front side frame 11 as indicated by an arrow.
The transmitted impact load F4 is supported by the left front side frame 11.

  On the other hand, after a part of the impact load F3 is absorbed by the outer extension member 42, the remaining impact load of the impact load F3 is distributed to the left front side frame 11 and the left upper member 13, respectively. It is transmitted as an arrow as F6.

The impact load F5 transmitted to the left front side frame 11 is supported by the left front side frame 11.
Further, the impact load F <b> 6 transmitted to the left upper member 13 is supported by the left upper member 13.
Thereby, the impact load F <b> 1 generated when the opponent vehicle 140 collides with the offset can be favorably supported by the vehicle body front structure 10.

  In the above embodiment, the inner support portion 45 is tilted forward at the tilt angle θ1 and the front wall 68 is tilted forward at the tilt angle θ2 so that the inner wall 64 and the outer wall 65 of the inner extension member 41 are substantially the same. Although the configuration of the protruding amount is illustrated, the present invention is not limited to this, and the outer extension member 42 can be formed in the same manner as the inner extension member 41.

  In the above-described embodiment, the example in which the flap end edges 71a, 72a, 73a, 74a are separated from the mounting plate 35 by the same distance S2 in the inner extension member 41 has been described. The extension member 42 can also be configured in the same manner as the inner extension member 41.

  Furthermore, in the above-described embodiment, the example in which the inner and outer beads 121 and 122 are provided on the inner extension member 41 has been described. However, the present invention is not limited to this, and the outer extension member 42 may be provided with inner and outer beads.

  Further, the left and right front side frames 11 and 12, the front bulkhead 24, the cooling member 26, the mounting plate 35, the inner and outer extension members 41 and 42, the inner cylindrical body 61, and the inner front lid portion 67 described in the above embodiment. , Upper wall fixing flap 71, lower wall fixing flap 72, inner wall fixing flap 73, outer wall fixing flap 74, inner plate 111, outer plate 112, upper bent portions 113, 115, lower bent portions 114, 116, inside and outside The shapes of the beads 121 and 122 are not limited to those illustrated, and can be changed as appropriate.

  INDUSTRIAL APPLICABILITY The present invention is suitable for application to an automobile having a vehicle body front part structure in which an extension member projects from the front end portion of the front side frame toward the front of the vehicle body.

It is a perspective view which shows the vehicle body front part structure which concerns on this invention. It is a perspective view which shows the principal part of the vehicle body front part structure which concerns on this invention. It is a top view which shows the principal part of the vehicle body front part structure which concerns on this invention. It is a disassembled perspective view which shows the vehicle body front part structure which concerns on this invention. FIG. 5 is an enlarged view of part 5 of FIG. 3. It is a disassembled perspective view which shows the left shock absorption unit of the vehicle body front part structure which concerns on this invention. It is a perspective view which shows the inner side cylinder body and outer side cylinder body of the left impact absorption unit which concerns on this invention. It is a perspective view which shows the inner front cover part and the outer front cover part of the left shock absorption unit which concern on this invention. It is a figure explaining the example which the other party vehicle carried out the offset collision to the vehicle body front part structure which concerns on this invention. It is a figure explaining the example which supports an impact load with the vehicle body front part structure which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Car body front part structure, 11 ... Left front side frame (front side frame), 11a, 12a ... Front end part of right and left front side frame, 12 ... Right front side frame (front side frame), 24 ... Front bulkhead, 26 ... Cooling member, 35 ... Mounting plate, 41 ... Inner extension member (extension member), 61 ... Inner cylinder (cylinder), 61a ... Front end of inner cylinder (front end of cylinder), 62 ... Upper wall , 63 ... lower wall, 64 ... inner wall, 65 ... outer wall, 67 ... inner front lid (front lid), 71 ... upper wall fixing flap, 71a, 72a, 73a, 74a ... flap edge, 72 ... lower Wall fixing flap, 73 ... Inner side wall fixing flap, 74 ... Outer wall fixing flap, 111 ... Inner plate, 112 ... Outer plate, 113, 115 ... Upper folding Sites, 114, 116 ... lower bent portion, 121 ... inner bead (bead), 122 ... outer bead (bead).

Claims (3)

In the vehicle body front structure in which the front side frame extends in the vehicle longitudinal direction, a mounting plate is provided at the front end of the front side frame, and an extension member projects from the mounting plate toward the front of the vehicle body.
The extension member is
A cylindrical body formed in a cylindrical shape on the upper wall, lower wall, inner wall, and outer wall;
A front lid for closing the front end of the cylindrical body,
The front lid part is
The upper wall, the lower wall, the inner wall, an upper wall fixing flap that can be welded to the outer wall, a lower wall fixing flap, an inner wall fixing flap, and an outer wall fixing flap, respectively.
The upper wall fixing flap, the lower wall fixing flap, the inner wall fixing flap, and the outer wall fixing flap are:
The vehicle body front part structure characterized by each flap edge being spaced apart by the same distance with respect to the said mounting plate. The mounting plate is tilted forward so as to tilt forward of the vehicle body toward the vehicle width direction center,
A front bulkhead on which a cooling member is mounted on the center side in the vehicle body width direction of the mounting plate is disposed,
The vehicle body front part structure according to claim 1, wherein the front bulkhead is provided on the mounting plate. The cylinder is
The inner side wall by being folded into a substantially U-shaped cross section, and an inner plate having upper and lower bent parts,
The outer wall by being folded into a substantially U-shaped cross section, and an outer plate having upper and lower bent portions,
The upper wall is formed by overlapping the upper bent portions of the inner plate and the outer plate,
The lower wall is formed by overlapping the lower bent portions of the inner plate and the outer plate,
The vehicle body front part structure according to claim 1, wherein a reinforcing bead is extended in the longitudinal direction of the vehicle body on the inner wall and the outer wall.

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