JP2007131187A - Front section vehicle body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front section vehicle body structure of an automobile, which can reduce the repair cost by absorbing the load from the front section of the vehicle with a replaceable part, and preventing the damage from developing to a welding part, etc. <P>SOLUTION: The front section vehicle body structure of the automobile disposes a radiator 1 in the front section of the vehicle. An upper cross member 2 and a lower cross member 4 extending in the horizontal direction of the vehicle is provided in the upper and lower part of the vehicle front section. The lower cross member 4 is disposed behind the vehicle for the upper cross member 2. A bracket 25 is disposed in the lower cross member 4 toward the front section of the vehicle. The radiator 1 is supported with the upper cross member 2 and the bracket 25. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a front body structure of an automobile, and more particularly to a radiator mounting structure.

In a conventional front body structure of a vehicle, for example, as shown in Patent Document 1, an upper cross member is supported by an upper cross member and a lower portion is attached to a lower radiator bracket extending rearward from the lower cross member. In the mode of supporting (see FIGS. 2 and 5), the upper portion of the radiator is supported by a bracket extending rearward from the upper cross member, and the lower portion is supported by a bracket extending rearward from the lower cross member (FIG. 10). And FIG. 11).
Japanese Unexamined Patent Publication No. 2000-25466 (FIGS. 2, 5, 10 and 11)

By the way, in the support mode of the radiator in the conventional front vehicle body structure, the lower cross member is installed offset to the front of the vehicle with respect to the upper cross member, or is installed at the same vertical position.
In this front body structure, when a load is applied from the front part of the vehicle body, the lower cross member is easily damaged, and further, the damage expands to the apron side member that supports the lower cross member at both ends. Repair costs may increase.

  The present invention solves the above problems, absorbs the load with a replaceable part against the load from the front of the vehicle body, prevents damage to the welded part, etc., and reduces repair costs. An object of the present invention is to provide a front vehicle body structure of an automobile.

In order to solve the above-described problems, the present invention provides a front body structure of an automobile in which a radiator is disposed at the front of a vehicle, and an upper cross member and a lower cross member that extend in the left-right direction of the vehicle above and below the front of the vehicle. A lower cross member is disposed on the rear side of the vehicle with respect to the upper cross member, a bracket is disposed on the lower cross member toward the front of the vehicle, and a radiator is formed by the upper cross member and the bracket. It is in supporting.
In the front body structure of the automobile of the present invention, the bracket is provided with a deformation starting point portion that becomes a deformation starting point when a load is applied from the front. Further, the bracket is provided with a radiator mounting portion for attaching the lower end of the radiator and a lower cross member fixing portion to be mounted on the lower cross member, and the deformation starting point portion is provided between the radiator mounting portion and the lower cross member fixing portion. That is.
Further, the front body structure of the automobile of the present invention is provided with front side members in the left and right front-rear direction of the front part of the vehicle body, respectively provided with extensions extending downward from the front ends of the left and right front side members, and the lower cross member is attached to the vehicle. The cross section is formed by offsetting the center part in the width direction forward from the both side end parts, arranging the bracket in the center part, and attaching both side end parts of the lower cross member to the lower surface of the extension member. The member is mounted on the extension.
Still further, in the front vehicle body structure of the automobile of the present invention, the attachment portion of the lower cross member to the extension is enlarged forward, and the enlarged portion and the front surface of the extension are coupled to each other via a reinforcing member. There is.
Further, the front body structure of the automobile according to the present invention is characterized in that the front and lower surfaces of the extension and the reinforcing member are coupled to each other through a lean force.

  According to the first aspect of the present invention, the lower cross member can be positioned relatively rearward of the vehicle body, so that there is no risk of being damaged when a load is applied from the front portion of the vehicle body. Since the bracket is deformed and absorbs the load even if a load is applied to the lower cross member, replacement and repair of expensive welded parts such as the lower cross member and apron side member, etc. Can be reduced as much as possible.

  According to the invention of claim 2 or 3, when a load is applied to the radiator, the bracket is deformed by a deformation starting point of the bracket, for example, a bead in the width direction, and the load is absorbed. Of course, damage to the apron side member or the like supporting the lower cross member can be reduced more reliably.

  According to the fourth aspect of the present invention, since the portion for attaching the bracket of the lower cross member is located in front of the support position of the lower cross member, the length of the bracket can be shortened, and the holding strength of the radiator is increased. Can be high. And since the support position of a lower cross member can be located in the back of a vehicle, damage to an apron side member etc. can be reduced more reliably.

The radiator supported by the bracket and positioned in front of the lower cross member applies a large torsional moment to the mounting portion of the lower cross member.
According to the invention of claim 5, since the torsional moment of the lower cross member is received by the reinforcing member, it is possible to improve the mounting strength against a large torsional moment of the mounting portion without increasing the size of the lower cross member.

  According to the invention of claim 6, the reinforcement of the front surface of the extension and the lower cross member attaching portion (lower surface of the extension) and the connecting portion of the reinforcing member can be reinforced with one lean force, thereby reducing the number of parts. The number of assembly steps can be reduced.

Hereinafter, a front body structure of an automobile according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a front portion of a vehicle to which a front body structure of a vehicle according to the present invention is applied. FIGS. 2 to 5 are views showing a support structure such as a radiator, a condenser, and an intercooler. FIG. 7 is a sectional view of each part in FIG. 4, FIG. 10 is a sectional view in FIG. 6, and FIGS. 11 to 15 are lower cross member mountings. FIG. 16 is a view showing the structure, FIG. 16 is a view showing the end of the lower cross member, FIGS. 17 to 20 are cross-sectional views of each portion in FIG. 14, and FIGS. 21 and 22 are cross-sectional views of each portion in FIG. is there.

As shown in FIGS. 1 to 10, the front body structure of an automobile according to the present invention is applied to support a radiator or the like disposed at the front of a vehicle.
In the following description, front, rear, side, top, bottom, inside, and outside correspond to front, rear, side, top, bottom, inside, and outside of the vehicle. Further, for convenience of explanation, the description will be made on one of the left and right sides of the vehicle, but the other has the same structure.

  In this embodiment, the upper cross member (hood lock member) 2 that supports the upper portion of the radiator 1 is, as shown in FIGS. 1 to 5, an upper component on the inner surface side of the front fender 3 on both sides, that is, a lamp support member. 2a, which is mounted on a dash side panel (not shown) or the like through a fender apron panel (not shown), and as shown in FIGS. 7 and 8, the lower cross member 4 supporting the lower portion of the radiator 1 is an upper The cross member 2 is arranged behind the vehicle body in plan view.

  As shown in FIGS. 3 and 5, the lower cross member 4 is formed by a lower cross member extension 5 that constitutes both end portions, and a lower cross member main portion 6 that is formed between the lower cross member extensions 5.

Next, the structure of the lower cross member 4 will be described with reference to FIGS.
The lower cross member extension 5 includes a lower cross member upper extension 7 and a lower cross member lower extension 8, as shown in FIGS. 17 and 18, including front flange portions 7 a and 8 a and rear flange portions 7 b and 8 b. It is formed in a closed cross-sectional shape by joining together.

On the other hand, the lower cross member main portion 6 has a closed cross-sectional shape by joining the lower cross member upper 9 and the lower cross member lower 10 to each other by joining the front flange portions 9a and 10a and the rear flange portions 9b and 10b. It is formed (see FIG. 8).
Then, the outer end portion of the lower cross member main portion 6 is fitted through an opening formed in the inner end portion of the lower cross member extension 5, and the overlapping portions are joined together (see FIG. 10). ).

  Further, the lower cross member extension 5 has an attachment portion 5a of the lower cross member 4 at an outer end portion, and the lower cross member lower extension 8 constituting the attachment portion 5a includes a lower cross member extension 5 as shown in FIGS. A tie-down hook 11 described later is joined. As shown in FIG. 18, two spacers 12 are interposed in the lower cross member upper extension 7 and the lower cross member lower extension 8 constituting the attachment portion 5a in the front-rear direction. The penetrating bolt insertion holes 5b and 5c are formed. The tie-down hook 11 is also formed with bolt insertion holes 11a and 11b at positions corresponding to the two bolt insertion holes 5b and 5c.

  As shown in FIG. 16, the inner end portion of the lower cross member extension 5 is disposed forward by a distance L from the middle of the pitch of the bolt holes 5b and 5c of the attachment portion 5a. Therefore, the lower cross member main portion 6 is positioned in front of the middle pitch between the bolt holes 5b and 5c of the mounting portion 5a.

  On the other hand, apron side members (front side members) 13 and 13 are disposed on both sides of the front portion of the vehicle body, as shown in FIGS. 11 to 15, and the apron side member 13 has a front end facing downward. An extending apron side front extension 14 is connected.

  The side wall of the apron side front extension 14 includes an apron side outer extension plate 15 and an apron side inner extension plate 16 (see FIG. 20). The apron side outer extension plate 15 and the apron side inner extension plate 16 have longitudinal beads 15a and 16a, respectively, at intermediate portions thereof. Then, the apron side outer extension plate 15 and the beads 15a and 16a of the apron side inner extension plate 16 are joined together, and the rear end edges 15b and 16b thereof are joined together to constitute the apron side front extension 14.

A bumper member plate 18 is integrally joined to the front opening ends of the apron side outer extension plate 15 and the apron side inner extension plate 16 via a bumper member plate reinforcement 17.
As shown in FIGS. 18 and 19, the bumper member plate reinforcement 17 and the bumper member plate 18 have rear bent portions 17a and 18a whose lower ends are bent backward, respectively. The rear bent portion 18 a of the bumper member plate 18 is joined to the lower end of the apron side front extension 14 so as to sandwich the rear bent portion 17 a of the bumper member plate reinforcement 17. Bolt insertion holes 17b, 17c, 18b, and 18c are formed in the rear bent portions 17a and 18a of the bumper member plate reinforcement 17 and the bumper member plate 18, respectively. Nuts 19 are welded to the upper edges of the positions corresponding to the holes 17b and 17c (see FIG. 18).

Further, as shown in FIGS. 11, 13, and 20, the inner end of the bumper member plate reinforcement 17 has a front bent portion 17d that is bent forward.
On the other hand, the front body structure of the automobile includes an apron side front plate 20. An apron side front plate 20 (reinforcing member in claims) is provided and reinforced at the protruding portion of the lower cross member 4 over the front surface of the bumper member plate (extension) 18. The apron side front plate 20 includes a vertical wall 20a that extends outward, a vertical wall 20b that protrudes forward, and a horizontal wall 20c that extends across the lower ends of the vertical walls. And the bolt insertion hole 20d is formed in the horizontal wall 20c of the apron side front plate 20, and the nut 21 is welded to the upper edge of the bolt insertion hole 20d (refer FIG. 17). As shown in FIG. 17, the vertical wall 20 a projecting outward is joined to the bumper member plate reinforcement 17 with the front bumper member plate 18 interposed therebetween, and the vertical wall 20 b projecting forward is formed on the bumper member plate reinforcement 17. The apron side front plate 20 is overlapped with and joined to the front bent portion 17 d, and the apron side front plate 20 is firmly fixed to the inner end on the front side of the apron side front extension 14.

  The lower cross member 4 is attached to the apron side front extension 14 of the apron side member 13 as follows.

  As shown in FIG. 18, the mounting portion 5a of the lower cross member extension 5 in the lower cross member 4 is overlapped with the rear bent portion 17a of the bumper member plate reinforcement 17 via the rear bent portion 18a of the front bumper member plate 18. Bolt insertion holes 11a and 11b of the tie-down hook 11, bolt insertion holes 5b and 5c of the lower cross member extension 5, bolt insertion holes 18b and 18c of the front bumper member plate 18, and bolt insertion holes 17b and 17c of the bumper member plate reinforcement 17 Bolts 22 are respectively inserted into the bolts, and the ends of the bolts are screwed into the nuts 19 to fasten the lower cross member 4 to the lower surface of the apron side front extension 14. Further, the front flange portions 7a and 8a of the lower cross member 4 are overlapped with the horizontal wall 20c of the apron side front plate 20, and the bolt insertion holes 5d of the lower cross member extension 5 and the bolt insertion holes 20d of the apron side front plate 20 are overlapped. The bolt 23 is inserted, the tip of the bolt is screwed into the nut 21, and the lower cross member 4 is fastened to the apron side front extension 14 via the apron side front plate 20.

  Further, both ends of the bumper member 24 are fastened to the upper part of the apron side front extension 14 via the front bumper member plate 18 (see FIGS. 2 to 4).

A lower bracket 25 for a radiator and a lower bracket 26 for an intercooler are fastened by bolts 27 and 28 to the upper surfaces of both side portions (inner end portions of the lower cross member extension 5) of the lower cross member 4 (see FIGS. 5 and 5). (See FIG. 6). As shown in FIG. 10, the mounting position of the radiator lower bracket 25 is the outer end portion of the lower cross member main portion 6 and the overlapping portion of the lower cross member extension 5, and does not require a separate reinforcing member and is firmly attached. Forming part.
As shown in FIG. 6, the radiator bracket 25 and the intercooler lower bracket 26 are formed so that the central portion in the width direction is curved upward, and flanges 25 c and 26 c are formed on the side edge and the tip edge. . The lower bracket 25 for the radiator and the lower bracket 26 for the intercooler are respectively provided with mounting holes 25a and 26a at the front end portions thereof, and the width direction is defined between the mounting holes 25a and 26a and the bolts 27 and 28. Beads 25b and 26b serving as deformation starting points extending in the direction are formed. Specifically, the beads 25b and 26b are formed at substantially the intermediate positions between the mounting holes 25a and 26a and the bolts 27 and 28, so that the brackets 25 and 26 can be easily deformed. In order to further facilitate the deformation, the beads 25b and 26b are also formed on the flanges 25c and 26c. One side of the intercooler lower bracket 26 is fixed on the radiator lower bracket 25 by being fastened together with a bolt 27 for fixing the radiator lower bracket 25.

The attachment structure of the radiator 1 and the intercooler 31 will be described with reference to FIGS.
First, as shown in FIG. 7, the radiator 1 is attached to the radiator lower bracket 25 via the bush 29, and the upper end is attached to the upper cross member 2 via the bush 30 and supported by the vehicle body. The lower end of the radiator 1 is positioned above the upper surface of the lower cross member 4 in the vertical direction of the vehicle, and the lower cross member 4 does not interfere with the backward movement of the radiator 1 when the load is moved backward on the radiator 1. It is set like this.
The lower end of the intercooler 31 is attached to the lower bracket 26 for intercooler via the bush 32, and the upper end is fastened to the upper bracket 33 for intercooler disposed on the bumper member 24 by bolts 34 (FIG. 9). reference).

  Further, the capacitor 35 is attached to the front of the radiator 1, the lower end is attached to the stay 1 a protruding forward from the lower edge frame of the radiator 1, and the upper end of the capacitor 35 is protruded forward from the upper edge frame of the radiator 1. It is fastened to 1b by a bolt 36 (see FIG. 8).

  According to the above embodiment, the upper cross member 2 and the lower cross member 4 extending in the left-right direction of the vehicle are provided on the upper and lower sides of the front portion of the vehicle, and the lower cross member 4 is arranged on the rear side of the vehicle with respect to the upper cross member 2. The lower cross member 4 is provided with a radiator lower bracket 25 toward the front of the vehicle, and the radiator 1 is supported by the upper cross member 2 and the radiator lower bracket 25. The deformation of the lower cross member 4 due to the impact load can be prevented. Since the radiator lower bracket 25 can be easily replaced, the repair cost is low.

  Further, the radiator lower bracket 25 is provided with a radiator mounting portion for attaching the lower end of the radiator 1 and a lower cross member fixing portion for mounting to the lower cross member 4, and the deformation between the radiator mounting portion and the lower cross member fixing portion. Since the bead 25b as the starting point portion is provided, the radiator lower bracket 25 can be easily deformed, and an impact load can be prevented from being applied to the lower cross member 4 through the radiator lower bracket 25. Similarly, the intercooler lower bracket 26 is also provided with a bead 26b serving as a deformation starting point, so that an excessive impact load can be prevented from being applied to the intercooler and the radiator 1 through the intercooler lower bracket 26. . Since the extension members such as the apron side members (front side members) 13 and 13 and the apron side front extension 14 that are welded parts to the vehicle body can be relatively arranged on the rear side of the vehicle with respect to the parts such as the radiator 1, The impact due to impact load can be minimized.

  An apron side front plate 20 is provided on the front surface of the bumper member plate (extension) 18 at the projecting portion of the lower cross member 4, and the attachment portion of the lower cross member 4 and the apron side front extension 14 is widened forward. Since the mounting is reinforced, it is possible to withstand the moment applied to the lower cross member 4, there is no need to increase the size of the extension member, and a space can be formed above the apron side front plate 20. The piping and piping work of the condenser, intercooler, etc. of the air conditioner that is attached to the front of the machine can be performed. Since the bumper member plate lean force 17 for connecting the bumper member plate (extension) 18 and the apron side front plate 20 is provided, the front and lower surfaces (cross member mounting portions) of the apron side front extension 14 are reinforced with one lean force. And the joint strength with the apron side front plate 20 which is a reinforcement member can be improved.

  The present invention is not limited to the above-described embodiment. For example, the degree to which the lower cross member is disposed on the rear side of the vehicle with respect to the upper cross member depends on the size of the vehicle body and the upper cross member. Further, the distance from the upper cross member can be set as necessary in consideration of the material strength of the lower cross member. Needless to say, the present invention can be appropriately modified and implemented without departing from the scope of the present invention.

It is the perspective view which showed the front part of the motor vehicle which applied the front vehicle body structure of the motor vehicle of this invention. In the perspective view which looked at the front part of the body from the upper part front, the arrangement relation of an upper cross member, a radiator, a capacitor, an intercooler, etc. is shown. In the perspective view which looked at the front part of the body from the lower part front, the arrangement relation of a lower cross member, a radiator, a capacitor, an intercooler, etc. is shown. It is a front view of a vehicle body front part. It is a bottom view of the vehicle body front part. It is the perspective view which showed the state which attached the lower bracket for radiators, and the lower bracket for intercoolers to the lower cross member. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is the perspective view which showed the attachment state of the edge part of the front lower cross member to the apron side front extension of the apron side member. It is the perspective view which showed the attachment state of the edge part of the front lower cross member to the apron side front extension of the apron side member. It is the perspective view which showed the attachment state of the edge part of the front lower cross member to the apron side front extension of the apron side member. It is the front view which showed the attachment state of the edge part of the front lower cross member to the apron side front extension of the apron side member. It is the side view which showed the attachment state of the edge part of the front lower cross member to the apron side front extension of the apron side member. It is the bottom view which looked at the edge part of a front lower cross member from the bottom. It is the EE sectional view taken on the line in FIG. It is the FF sectional view taken on the line in FIG. It is the GG sectional view taken on the line in FIG. It is the HH sectional view taken on the line in FIG. It is the II sectional view taken on the line in FIG. It is the JJ sectional view taken on the line in FIG.

Explanation of symbols

1 Radiator 1a, 1b Stay 2 Upper cross member (hood lock member)
3 Front fender 4 Lower cross member 5 Lower cross member extension 5a Mounting part 5b, 5c, 5d Bolt insertion hole 6 Lower cross member main part 7 Lower cross member upper extension 7a Front flange part 7b Rear flange part 8 Lower cross member lower extension 8a Front flange part 8b Rear flange part 9 Lower cross member upper 9a Front flange part 9b Rear flange part 10 Lower cross member lower 10a Front flange part 10b Rear flange part 11 Tie-down hook 11a, 11b Bolt insertion hole 12 Spacer 13 Apron side Member (front side member)
14 Apron side front extension 15 Apron side outer extension plate 15a Bead 15b Rear edge 16 Apron side inner extension plate 16a Bead 16b Rear edge 17 Bumper member plate reinforcement (reinforcing member)
17a Rear bent portion 17b, 17c Bolt insertion hole 18 Front bumper member plate 18a Rear bent portion 18b, 18c Bolt insertion hole 19 Nut 20 Apron side front plate (reinforcing member)
20a, 20b Vertical wall 20c Horizontal wall 21 Nut 22, 23 Bolt 24 Bumper member 25 Lower bracket for radiator 25a Mounting hole 25b Bead (deformation start point)
25c Flange 26 Lower bracket for intercooler 26a Mounting hole 26b Bead (deformation starting point)
26c Flange 27, 28 Bolt 29, 30 Bush 31 Intercooler 32 Bush 33 Intercooler upper bracket 34 Bolt 35 Capacitor 36 Bolt

Claims (6)

  An automobile front body structure in which a radiator is disposed at a front portion of a vehicle, wherein an upper cross member and a lower cross member extending in a left-right direction of the vehicle are provided above and below the front portion of the vehicle, An automobile characterized in that a lower cross member is disposed on the rear side of a vehicle, a bracket is disposed on the lower cross member toward the front of the vehicle, and a radiator is supported by the upper cross member and the bracket. Front car body structure.   The front body structure of an automobile according to claim 1, wherein the bracket is provided with a deformation starting point portion that becomes a deformation starting point when a load is applied from the front.   The bracket is provided with a radiator mounting portion for attaching the lower end of the radiator and a lower cross member fixing portion to be mounted on the lower cross member, and the deformation starting point portion is provided between the radiator mounting portion and the lower cross member fixing portion. The front body structure of an automobile according to claim 2.   Front side members are provided in the left and right front-rear direction of the front portion of the vehicle body, and extensions extending downward from the front end portions of the left and right front side members are provided, respectively. Formed by offsetting forward, the bracket is disposed at the center, both side ends of the lower cross member are attached to the lower surface of the extension member, and the cross member is mounted on the extension. The front body structure of an automobile according to any one of claims 1 to 3.   The front part of the automobile according to claim 4, wherein a part of the lower cross member attached to the extension is enlarged forward, and the enlarged part and the front surface of the extension are coupled to each other via a reinforcing member. Body structure.   The front body structure of an automobile according to claim 5, wherein a front surface and a lower surface of the extension and the reinforcing member are coupled to each other through a lean force.

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