JP2009083687A - Front end structure for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front end structure for an automobile capable of reducing repairing cost, by maximally preventing damage of a heat exchanger in a light collision, while securing load dispersing performance to a vehicle body of a shroud panel in a heavy collision, in the front end structure of the automobile for supporting the heat exchanger by the resin shroud panel of the vehicle front end. <P>SOLUTION: A thin rupture part 58 is formed over the whole periphery in a boundary between a reinforcing part 55 and a radiator support frame part 56 so as to surround the radiator support frame part 56. The shroud panel 5 is constituted so that the radiator support frame part 56 easily ruptures with this thin rupture part 58 as a chance when a load of a predetermined value or more acts. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a front structure of an automobile, and more particularly, to a front structure of an automobile in which a heat exchanger such as a radiator is supported by a resin shroud panel installed at the front of the vehicle.

  2. Description of the Related Art Conventionally, a front structure of an automobile is known in which a shroud panel constituting an end panel at the front of a vehicle body is formed of a resin member, and a heat exchanger such as a radiator is supported by the resin shroud panel. According to this front part structure, the front part of the vehicle body can be modularized (unitized), and the assembly workability of the vehicle body can be improved, so that it has been adopted in many automobiles in recent years.

  However, when the vehicle body front part is constituted by such a resin shroud panel, there is a possibility that the bonnet cannot be sufficiently supported due to insufficient rigidity.

  Therefore, as shown in Patent Document 1 below, a metal reinforcement member is integrally formed by insert molding or the like on the upper member extending in the vehicle width direction at the upper portion of the shroud panel, and the metal is formed at the upper portion of the shroud panel while being a resin shroud panel. What obtains the same rigidity as a shroud panel is known.

  In addition, according to such a front structure, the upper part of the shroud panel is fastened and fixed to the apron rain member at the upper part of the engine room. The collision load can be distributed, and the collision safety performance of the vehicle can be improved.

Japanese Patent Laid-Open No. 10-264855

  By the way, in recent years, the layout space in the engine room has decreased due to the need for expansion of the passenger compartment and the enlargement of the engine. Moreover, since the height position of the bonnet front end is also lowered, the position of the shroud panel is also retracted. For this reason, the heat exchanger supported by the shroud panel may be laid out not on the engine room side but on the vehicle front side.

  On the other hand, the front overhang of a car is required to be as short as possible to improve the maneuverability of the car, and the position of the front bumper has been retracted to the rear side of the vehicle.

  For these reasons, in recent years, an increasing number of automobiles adopt a layout structure in which a heat exchanger is arranged immediately after a front bumper.

  However, when such a layout structure is adopted, in the event of a light collision, the heat exchanger is easily damaged by the retreat of the front bumper, and the expensive heat exchanger must be replaced. There is a problem that the repair cost is increased.

  In order to solve this problem, it is conceivable to adopt a structure in which the support rigidity of the shroud panel is reduced and the entire shroud panel is retracted in the event of a light collision.

  However, when such a structure is adopted, when a heavy collision occurs, the collision load cannot be distributed and transmitted from the shroud panel to the vehicle body member such as the apron rain member as in Patent Document 1 described above. A new problem arises that safety performance is degraded.

  Therefore, in the present invention, in a front structure of an automobile that supports a heat exchanger with a resin shroud panel at the front of the vehicle, the load distribution performance to the vehicle body of the shroud panel at the time of heavy collision is ensured, and at the time of light collision An object of the present invention is to provide a front structure of an automobile that can prevent damage to a heat exchanger as much as possible and reduce repair costs.

  The front structure of the automobile according to the present invention includes an upper portion extending in the vehicle width direction, a lower portion extending in the vehicle width direction, and a side portion that extends and connects the upper portion and the lower portion in the vertical direction to support the heat exchanger. A front structure of an automobile including a resin shroud panel and a front bumper extending in the vehicle width direction on the vehicle front side of the shroud panel, the shroud panel including a metal reinforcement and the front bumper A reinforcing part fixed to a vehicle body member on the vehicle rear side, a heat exchanger supporting part for supporting the heat exchanger, the front end of the reinforcing part being located on the vehicle front side, the reinforcing part and the heat And a fragile part formed at the boundary with the exchanger support part.

According to the above configuration, at the time of a vehicle collision, the front bumper moves backward, and the heat exchanger support portion moves backward upon receiving the collision load. In the case of a light collision, the weak part deforms and the heat exchanger support part is displaced relative to the reinforcement part, and the heat exchanger moves backward to prevent interference with the front bumper etc. Can do. On the other hand, in the case of a heavy collision, a collision load further acts on the reinforcing portion, and the collision load is distributed and transmitted to the vehicle body member on the vehicle rear side through the reinforcing portion.
For this reason, at the time of a light collision, even if the front bumper moves backward, the heat exchanger supported by the shroud panel can be prevented from being damaged. On the other hand, at the time of a heavy collision, the collision load can be distributed to the vehicle body member on the vehicle rear side through the reinforcing portion.
Here, the “heat exchanger” includes a radiator, a condenser of an air conditioner, an intercooler of a charging device, and the like. The “vehicle body member on the rear side of the vehicle from the front bumper” includes a vehicle body panel such as a front side frame, an apron rain member, a bracket fixed to these member members, a suspension cross member, or a wheel house apron.

In one embodiment of the present invention, the fragile portion is constituted by a thin portion or a slit portion formed at the boundary between the reinforcing portion and the heat exchanger support portion.
According to the above configuration, the fragile portion is a thin-walled portion or a slit portion, and when subjected to a collision load, the fragile portion is broken and the heat exchanger support portion and the heat exchanger are connected to the vehicle rear side. Can be relatively displaced.
In addition, by forming the fragile portion as a thin portion or a slit portion in this way, the fragile portion can be simultaneously formed when the resin shroud panel is formed.
Therefore, the heat exchanger support can be retracted in the event of a vehicle collision without deteriorating the productivity of the shroud panel, and both the protection of the heat exchanger at the time of light collision and the improvement of load distribution performance at the time of heavy collision Can be achieved.

In one embodiment of the present invention, the fragile portion is constituted by a rubber portion formed at a boundary between the reinforcing portion and the heat exchanger support portion.
According to the said structure, when a weak load is made into a rubber part, when a collision load is received, this weak part elastically deforms and a heat exchanger support part can be displaced relatively.
For this reason, a heat exchanger support part and a heat exchanger can be retracted, without producing a fracture | rupture in a shroud panel.
Therefore, at the time of a light collision, not only the heat exchanger but also the shroud panel need not be replaced, and the repair cost can be further reduced.

In one embodiment of the present invention, the reinforcing portion is formed continuously from the upper portion to the side portion, and both end portions of the reinforcing portion of the upper portion extend in the vehicle front-rear direction at both side ends in the vehicle width direction. It is fixed to an apron rain member, and the reinforcing portion of the side portion is fixed to a front side frame extending in the vehicle front-rear direction.
According to the above configuration, the reinforcement part of the upper part and the reinforcement part of the side part are fixed to the apron rain member and the front side frame. It can be reliably transmitted to the frame.
Therefore, load distribution at the time of a heavy collision can be appropriately performed on the frame members at the upper and lower positions, and the collision safety performance of the vehicle can be improved.

In one embodiment of the present invention, the reinforcing portion is formed in the upper portion, the side portion, and the lower portion so as to surround the heat exchanger, and both end portions of the reinforcing portion of the upper portion are arranged in the vehicle width. It is fixed to an apron rain member extending in the vehicle longitudinal direction at both ends in the direction, and the reinforcing portion of the side portion is fixed to a front side frame extending in the vehicle longitudinal direction.
According to the above configuration, the reinforcing part is formed in a frame shape on the upper part, the lower part, and the side part, and the reinforcing part is fixed to the apron rain member and the front side frame. The increased frame-shaped reinforcing portion can reliably receive a collision load and can reliably transmit this collision load to the apron rain member and the front side frame.
Therefore, load distribution at the time of a heavy collision can be reliably and appropriately performed, and the collision safety performance of the vehicle can be improved.

In one embodiment of the present invention, the reinforcing portion of the lower portion is fixed to a suspension cross member that supports the suspension device.
According to the said structure, the position of the reinforcement part of a lower part is fixed by fixing the reinforcement part of a lower part to a suspension cross member.
For this reason, at the time of a light collision, the heat exchanger support part can be reliably displaced from the reinforcement part of the lower part. Further, in the case of a heavy collision, the collision load can be transmitted from the reinforcing portion of the lower portion to the suspension cross member, and the collision load can be dispersed.
Thus, the suspension cross member can be used to improve the heat exchanger protection performance during light collisions and the load distribution performance during heavy collisions.

In one embodiment of the present invention, the heat exchanger support portion includes an upper frame portion extending in the vehicle width direction, a lower frame portion extending in the vehicle width direction, and a lateral portion extending in the vertical direction to connect the upper frame portion and the lower frame portion. A frame portion is provided, and the horizontal frame portion is fixed to a bumper beam of the front bumper.
According to the above configuration, by fixing the horizontal frame portion of the heat exchanger support portion to the bumper beam of the front bumper, the frame-shaped heat exchanger support portion also moves backward as the front bumper moves backward in the event of a vehicle collision.
For this reason, since there is no possibility that the heat exchanger supported by the heat exchanger support part directly interferes with the bumper beam, it is possible to reliably prevent the heat exchanger from being damaged.
Therefore, it is possible to reliably prevent the heat exchanger from being damaged and reduce the repair cost.

In one embodiment of the present invention, a hood lock mechanism for locking the bonnet is provided in the reinforcing portion of the upper portion.
According to the above configuration, since the hood lock mechanism is provided in the reinforcement part of the upper part, even if the heat exchanger support part is broken and detached from the reinforcement part at the time of a light collision, the hood lock mechanism is separated from the vehicle body side member. It can be prevented from being separated.
Therefore, the hood support rigidity of the hood lock mechanism at the time of collision can be increased while preventing damage to the heat exchanger at the time of light collision.

In one embodiment of the present invention, the vehicle body member to which the reinforcing portion is fixed is set to a vehicle body member at a position rearward of the vehicle from the crash box that absorbs collision energy.
According to the above configuration, since the reinforcing portion is fixed by the vehicle body member at the vehicle rear side position from the crash box, the position of the reinforcing portion is fixed without being affected by the crash box that is deformed by a light collision. Can do.
For this reason, since the reinforcing part does not displace rearward at the time of a light collision, a relative displacement is surely generated between the reinforcing part and the heat exchanger support part at the time of a light collision, and deformation or the like may occur in the fragile part. it can.
In addition, by fixing the reinforcing portion to the vehicle body member at the vehicle rear side position from the crash box, the collision load from the reinforcing portion is transmitted to the vehicle body member without being affected by the crash box.
Therefore, damage to the heat exchanger can be prevented more reliably, the protection performance of the heat exchanger at the time of a light collision can be improved, and the load distribution performance at the time of heavy collision can also be improved.

  According to the present invention, at the time of a light collision, even if the front bumper moves backward, the heat exchanger supported by the shroud panel can be prevented from being damaged. On the other hand, during a heavy collision, the collision load can be distributed to the vehicle body member on the vehicle rear side through the reinforcing portion.

  Therefore, in the front structure of an automobile that supports a heat exchanger with a resin shroud panel at the front of the vehicle, the heat exchanger at the time of a light collision while ensuring the load distribution performance to the vehicle body of the shroud panel at the time of a heavy collision As much as possible, the repair cost can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view of an automobile employing the automobile front structure according to the first embodiment of the present invention, FIG. 2 is a front perspective view of a shroud panel, FIG. 3 is a plan view of the automobile front structure, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. 3, FIG. 5 is a detailed view of the main part of FIG. 4, FIG. 6 is a cross-sectional view taken along the line BB of FIG.

  The front structure of this embodiment includes a front bumper 1 extending in the vehicle width direction at the front end of the vehicle, a bumper beam 2 extending in the vehicle width direction inside the front bumper 1, and a front extending in the vehicle front-rear direction at a rear position of the bumper beam 2. Side frames 3 and 3, apron rain members 4 and 4 extending in the vehicle longitudinal direction at the vehicle width direction side end, and extending in the vertical and vehicle width directions at the rear position of the bumper beam 2 constitute the front end wall of the engine room ER A shroud panel 5 and a perimeter frame 6 extending in the vehicle width direction so as to bridge the left and right front side frames 3 and 3 below the engine room ER. Reference numeral 7 denotes a headlamp, and 8 denotes a power train including the engine E and the transmission M.

  Among these, the bumper beam 2 described above is configured by a member member that is bent into a substantially hat shape in two upper and lower stages so as to ensure vehicle longitudinal rigidity, and is installed inside the front bumper 1. The bumper beam 2 is configured to receive a frontal collision load or an offset collision load.

The aforementioned front side frames 3 and 3 are installed at both sides in the vehicle width direction in the engine room ER, and are constituted by a pair of left and right substantially rectangular closed cross-section members extending in the vehicle longitudinal direction. The bumper beam 2 is fixed at the front ends of the front side frames 3 and 3 via crash boxes 9 and 9 (see FIG. 6).
Therefore, when a frontal collision load or the like acts on the front side frames 3 and 3 from the front side of the vehicle, the load is distributed to a vehicle body frame (not shown) below the passenger compartment. A "path" path is formed.

The above-described apron rain members 4 and 4 are installed at the upper side end positions in the engine room ER, and are constituted by member members having a rectangular closed cross-sectional shape extending in the vehicle front-rear direction.
The apron rain members 4, 4 are fastened and fixed at both ends of the shroud panel 5 at the front ends 4a, 4a, and at the rear end (not shown), the base end (not shown) of the front pillar at the front of the passenger compartment. ). For this reason, when a frontal collision load or the like acts on the apron rain members 4 and 4 from the front side of the vehicle, the load is distributed to the roof panel (not shown) on the upper side of the passenger compartment, so-called “upper load path”. A path is formed.

  As shown in FIG. 2, the shroud panel 5 includes an upper member portion 51 that extends in the vehicle width direction at the upper portion, side portions 52 and 52 that extend in the vertical direction at both center positions, and a vehicle width direction at the center lower position. And a lower portion 53 extending. Among these, the upper member portion 51 includes two arm portions 51a and 51a that extend laterally at both side positions, and a center upper portion 51b at the center position.

  The shroud panel 5 has a panel body entirely formed of a resin member, and a metal rain member 54 is insert-molded in part.

  The portion in which the metal rain member 54 is insert-molded is configured as a “reinforcing portion” 55 so as to have substantially the same rigidity as the metal shroud panel.

  Specifically, the reinforcing portion 55 includes an entire portion (55A) of the arm portions 51a and 51a, an upper portion (55B) of the center upper portion 51b, an outer portion (55C and 55C) of the side portions 52 and 52, and a lower portion. The lower part (55D) of the part 53 is set, and in particular, the rectangular part (55B, 55C, 55D) is set in the central part.

  On the inner side (center side) of the frame-shaped reinforcing portions (55B, 55C, 55D), a radiator support frame portion 56 is provided so as to protrude toward the vehicle front side. The radiator support frame portion 56 is an upper frame portion 56A which is a lower portion of the center upper portion 51b, horizontal frame portions 56B and 56B which are inner portions of the side portions 52 and 52, and an upper portion of the lower portion 53. A lower frame portion 56C. Further, the radiator support frame portion 56 supports the radiator R, which is a heat exchanger, with a total of four support portions 57 in the left and right positions of the upper frame portion 56A and the lower frame portion 56C.

  Further, as shown in FIG. 4, the radiator support frame portion 56 has a rising wall surface 56 a that protrudes to the front side of the vehicle and a load receiving surface 56 b that extends in the vertical direction at the front end position. Among these, the load receiving surface 56b positioned at the front end position is configured to receive a collision load from the bumper beam 2 toward the vehicle rear side.

  As shown in FIG. 2, at the boundary between the reinforcing portion 55 and the radiator support frame portion 56, a thin fracture portion 58 is formed over the entire circumference so as to surround the radiator support frame portion 56. As shown in FIGS. 5 and 7, the thin-walled fracture portion 58 is configured by forming a concave portion 58 b having a V-shaped cross section in a connecting wall portion 58 a that connects between the reinforcing portion 55 and the radiator support frame portion 56. is doing. And when the load more than predetermined value acts, it is comprised so that the radiator support frame part 56 may fracture | rupture easily by using this thin fracture | rupture part 58 as a trigger. The thin fracture portion 58 is formed simultaneously with the molding of the resin shroud panel 5.

  In addition, as shown in FIGS. 5 and 7, the metal rain member 54 that is insert-molded inside the reinforcing portion 55 is constituted by a member member having a substantially U-shaped cross section, and a relatively large load is applied thereto. Even in this case, it has rigidity that does not easily deform.

  Further, the reinforcing portions 55 (55B, 55C) formed of resin are also formed in a substantially U-shaped cross section, but a rib portion 55a extending in the vehicle front-rear direction is formed therein, and this U-shaped Has retained rigidity.

On the front surface of the center upper portion 51b of the shroud panel 5, a lock pocket portion 59 for accommodating the bonnet lock mechanism BL is formed. As shown in FIG. 5, the bonnet lock mechanism BL accommodated in the lock pocket portion 59 is fixed to the reinforcing portion 55B of the center upper portion 51b, and is fastened and fixed to the metal rain member 54 by a fixing bolt or the like (not shown). is doing.
For this reason, even when a collision load is applied and a behavior such that the front end portion 11a of the bonnet 11 jumps upward occurs, the position of the bonnet front end portion 11a does not move away from the center upper portion 51b. Can be held firmly.

  In addition, as shown in FIG. 2, an apron fixing portion 60 for fastening and fixing to the front end 4 a of the apron rain member 4 is provided at the side end portion of the arm portion 51 b of the upper member portion 51.

  When the vehicle body is assembled, the apron fixing portion 60 can be easily fastened and fixed to the front portion of the vehicle body by assembling the shroud panel 5 into which the radiator R is previously assembled and modularized from above the vehicle body. Further, the apron fixing portion 60 firmly fixes the reinforcing portion 55 of the shroud panel 5 and the apron rain member 4 of the vehicle body side member.

Further, bolt fixing holes 61 and 61 for assembling the shroud panel 5 to the front side frames 3 and 3 are formed on the front surface of the reinforcing portion 55C of the side portion 52 of the shroud panel 5.
As shown in FIG. 7, the bolt fixing hole 61 is provided to fasten and fix the mounting bolt 63 of the mounting plate 62 having a substantially L-shaped cross section joined to the front side frame 3 to the reinforcing portion 55 </ b> C of the side portion 52. ing. By fastening and fixing the attachment plate 62 using the bolt fixing holes 61, the reinforcing portion 55 of the shroud panel 5 can be firmly fixed to the front side frame 3.
This fastening and fixing is performed after the modularized shroud panel 5 is assembled from above the vehicle body.

A load transmission bracket 70 is provided between the horizontal frame portion 56 </ b> B of the radiator support frame portion 56 and the bumper beam 2. This load transmission bracket 70 is formed by a bracket member having a substantially crank-shaped cross section, joined to the rear surface of the bumper beam 2 by a front end flange portion 70a, and a radiator support frame portion 56 (56B) by a rear end flange portion 70b. It is fastened and fixed to the front.
Thus, by providing the load transmission bracket 70 between the radiator support frame portion 56 and the bumper beam 2, the collision load can be directly transmitted to the radiator support frame portion 56. In addition, after the collision, the radiator supporting frame portion 56 separated from the reinforcing portion 55 can be held by the load transmission bracket 70.

  As shown in FIG. 1, the above-described perimeter frame 6 includes upper bulging portions 6A and 6A that have both ends extending upward and fastened to the front side frames 3 and 3, and a lateral member portion 6B that extends in the vehicle width direction. It has.

  The perimeter frame 6 functions as a support cross member of the suspension device by pivotally supporting a suspension arm of a front suspension device (not shown) at the upper raised portions 6A and 6A.

A connecting plate 65 extending from the reinforcing portion 55B of the lower portion 53 of the shroud panel 5 is fixed to the lateral member portion 6B of the perimeter frame 6.
Specifically, as shown in FIG. 4, the connecting plate 65 joined to the lower surface of the reinforcing portion 55D of the lower portion 53 and the lateral member portion 6B of the perimeter frame 6 are fastened and fixed by a bolt / nut fastener 66. ing.

  Thus, the shroud panel 5 is fastened and fixed to the perimeter frame 6 that is the vehicle body side member also in the reinforcing portion 55D of the lower portion 53.

  Next, the deformation behavior of the front part of the vehicle body, particularly the shroud panel 5 when a frontal collision occurs will be described with reference to FIGS. 8A and 8B are cross-sectional views showing a deformed state of the shroud panel 5 when a collision load is applied. FIG. 8A is a cross-sectional view corresponding to FIG. 7, and FIG. 8B is a cross-sectional view corresponding to FIG. FIG. 9 is a plan view showing a deformation state of the front part of the vehicle body at the time of collision, where (a) is a plan view at the time of a light collision and (b) is a plan view at the time of a heavy collision. FIG. 10 is a side view showing a deformation state of the front part of the vehicle body at the time of a collision. FIG. 10A is a side view at the time of a light collision, and FIG. 10B is a side view at the time of a heavy collision.

  As shown in FIG. 8A, when a collision load acts on the bumper beam 2 from the front side of the vehicle body, the collision load is transmitted to the radiator support frame portion 56 of the shroud panel 5 through the load transmission bracket 70 fixed to the bumper beam 2. Is done.

  The radiator support frame portion 56 to which the collision load is transmitted has a backward movement behavior. This backward movement behavior causes bending deformation in the thin fracture portion 58 and causes “rupture”. As a result, the radiator support frame portion 56 and the radiator R are freely displaced relative to the rear side of the vehicle body without being restrained by the strong reinforcing portion 55.

  Further, at the time of this collision, the crash box 9 installed at the front end of the front side frame 3 is also buckled and the collision energy is absorbed. Even if the crash box 9 is buckled and deformed in this way, Since the attachment plate 62 is joined and fixed to the front side frame 3, the reinforcing portion 55 does not retreat. Therefore, relative displacement is reliably generated between the reinforcing portion 55 and the radiator support frame portion 56, and the “rupture” of the thin-walled fracture portion 58 can be reliably caused.

  Further, as shown in FIG. 8B, also in the upper part (51 b) of the shroud panel 5, the “break” is triggered by the thin broken part 58 between the reinforcing part 55 and the radiator support frame part 56. Arise. For this reason, the radiator support frame portion 56 is freely displaced relative to the rear side of the vehicle body without being restrained by the reinforcing portion 55 even at the upper portion of the shroud panel 5.

  However, as shown in FIG. 8B, since the bonnet lock mechanism BL is fixed to the reinforcing portion 55 of the center upper portion 51b, the radiator support frame portion 56 is detached from the reinforcing portion 55 at the time of collision. However, it is possible to prevent the bonnet lock mechanism BL from being detached from the vehicle body side member.

  Specifically, when looking at the vehicle body structure, as shown in FIG. 9A, the crash box 9 fixed to the front end of the front side frame 3 buckles and deforms in the event of a light collision. Although the beam 2 moves backward, the radiator support frame 56 receives a collision load and is relatively displaced rearward of the vehicle, so that the radiator support frame 56 and the radiator R move rearward of the vehicle.

  For this reason, even if the bumper beam 2 moves backward, interference with the radiator R can be prevented, and damage to the radiator R during a light collision can be prevented.

  As shown in FIG. 10 (a), when a collision load is received, the radiator support frame portion 56 and the radiator R move backward so as to be positioned inside the reinforcing portion 55 of the shroud panel 5. Interference with the beam 2 can be prevented, and damage to the radiator R can be prevented.

  On the other hand, in the case of a heavy collision, as shown in FIG. 9B, the bumper beam 2 is further retracted, but the reinforcing portion 55 of the shroud panel 5 is fastened and fixed to the front side frame 3 and the apron rain member 4. Therefore, the collision load acting on the shroud panel 5 from the bumper beam 2 is transmitted to the vehicle body members on the rear side of the vehicle body such as the front side frame 3 and the apron rain member 4.

  For this reason, collision load distribution can be performed by the above-described “underload path” and “upper load path”, and the collision safety performance of the vehicle can be enhanced by using the reinforcing portion 55 of the shroud panel 5.

  As shown in FIG. 10B, the reinforcing portion 55D of the lower portion 53 of the shroud panel 5 is also fixed to the perimeter frame 6 so that the collision load on the lower portion of the shroud panel 5 is also transmitted through the connecting plate 65. It can be transmitted to the frame 6. Therefore, it is possible to further improve the dispersion performance of the collision load.

Next, the effect of this embodiment comprised in this way is demonstrated.
In this embodiment, the shroud panel 5 is integrally formed with a metal rain member 54 and is fixed to the front side frames 3 and 3 and the apron rain members 4 and 4, and the reinforcing portion 55. A radiator support frame portion 56 that supports the radiator R and is located further on the vehicle front side, and a thin-walled fracture portion 58 that is formed at the boundary between the reinforcing portion 55 and the radiator support frame portion 56.

Thereby, at the time of a vehicle collision, the bumper beam 2 moves backward, receives the collision load, and the radiator support frame portion 56 moves backward. In the case of a light collision, the thin broken portion 58 breaks, and the radiator support frame portion 56 is displaced relative to the reinforcing portion 55, and the radiator R moves backward to interfere with the bumper beam 2 and the like. Can be prevented. On the other hand, in the case of a heavy collision, a collision load is also applied to the reinforcing portion 55, and the collision load is distributed and transmitted to the front side frames 3, 3 and the apron rain members 4, 4 on the vehicle rear side through the reinforcing portion 55. Will be.
For this reason, at the time of a light collision, even if the bumper beam 2 moves backward, the radiator R supported by the shroud panel 5 can be prevented from being damaged. On the other hand, at the time of a heavy collision, the collision load can be distributed to the front side frames 3 and 3 and the apron rain members 4 and 4 on the vehicle rear side through the reinforcing portion 55.
Therefore, in the front structure of the automobile in which the radiator R is supported by the resin shroud panel 5 at the front of the vehicle, the radiator R at the time of a light collision while ensuring the load distribution performance to the vehicle body of the shroud panel 5 at the time of a heavy collision. As much as possible, the repair cost can be reduced.

  In addition, although this embodiment demonstrated the shroud panel 5 which supports only the radiator R, you may comprise so that the condenser of an air-conditioner apparatus, the intercooler of a charging apparatus, etc. may be supported.

Further, in this embodiment, the thin broken portion 58 is formed at the same time as the resin molding of the shroud panel 5.
Thereby, the thin fracture | rupture part 58 can be easily shape | molded in the case of shaping | molding of resin-made shroud panels 5. FIG.
Therefore, the radiator support frame portion 56 can be retracted at the time of a vehicle collision without deteriorating the productivity of the shroud panel 5, and both the protection of the radiator R at the time of a light collision and the improvement of load distribution performance at the time of a heavy collision can be achieved. Can be achieved.

In addition, you may form the slit part 158 as shown in FIG. 11 instead of the thin fracture | rupture part 58 of this embodiment. By using the slit portion 158 as described above, when a collision load is applied, the “break” can be further promoted, and it is possible to achieve both the protection of the radiator R at the time of a light collision and the load distribution performance of a heavy collision. it can.
Further, since the slit portion 158 can be simultaneously formed when the resin shroud panel 5 is formed, the productivity of the shroud panel 5 is not deteriorated.

Moreover, this embodiment forms the reinforcement part 55 in the upper member part 51 of the shroud panel 5, the side parts 52 and 52, and the lower part 53 so that the radiator R may be surrounded (55B, 55C, 55D), Both end portions of the upper member portion 51 are fixed to the apron rain members 4 and 4 (60, 60), and the reinforcing portion 55 of the side portion is fixed to the front side frames 3 and 3 extending in the vehicle front-rear direction (62 62).
Accordingly, the reinforcing portion 55 is formed in a frame shape on the upper member portion 51, the lower portion 53, and the side portions 52, 52, and the reinforcing portion 55 is fixed to the apron rain members 4, 4 and the front side frames 3, 3. Therefore, in the event of a heavy collision, the collision load can be reliably received by the reinforcing portion 55 having a substantially frame shape (55B, 55C, 55D) with increased proof stress, and this collision load is applied to the apron rain members 4 and 4 and the front. It can be reliably transmitted to the side frames 3 and 3.
Therefore, load distribution at the time of a heavy collision can be reliably and appropriately performed, and the collision safety performance of the vehicle can be improved.

In this embodiment, the reinforcing portion 55 </ b> D of the lower portion 53 of the shroud panel 5 is fixed to the perimeter frame 6.
Thereby, the position of the reinforcement part 55D of the lower part 53 of the shroud panel 5 is fixed reliably.
For this reason, in the case of a light collision, the radiator support frame portion 56 can be reliably displaced from the reinforcing portion 55D of the lower portion 53, and the radiator R and the radiator support frame portion 56 can be retracted. Further, in the case of a heavy collision, the collision load can be transmitted from the reinforcing portion 55 of the lower portion 53 to the perimeter frame 6, and the collision load can be dispersed.
Therefore, the perimeter frame 6 can be used to improve the protection performance of the radiator R at the time of light collision and the load distribution performance at the time of heavy collision.

In this embodiment, a connecting plate 70 is provided between the radiator support frame portion 56 and the bumper beam 2.
Thereby, at the time of a vehicle collision, the radiator support frame portion 56 also moves backward together with the bumper beam 2 moving backward.
For this reason, since there is no possibility that the radiator R supported by the radiator support frame portion 56 directly interferes with the bumper beam 2, damage to the radiator R can be more reliably prevented.
Therefore, it is possible to reliably prevent damage to the radiator R and reduce the repair cost.

In this embodiment, a hood lock mechanism BL for locking the hood 11 is provided in the reinforcing portion 55B.
Thereby, even if the radiator support frame portion 56 is broken and detached from the reinforcing portion 55 at the time of a light collision, the bonnet lock mechanism BL can be prevented from being separated from the vehicle body side.
Therefore, it is possible to increase the support rigidity of the hood 11 by the hood lock mechanism BL at the time of collision while preventing the radiator R from being damaged at the time of a light collision.

In this embodiment, the vehicle body member to which the reinforcing portion 55 is fixed is set to the front side frame 3 on the vehicle rear side from the crash box 9 that absorbs collision energy.
Thereby, the reinforcement part 55 can be firmly fixed, without being influenced by the crash box 9 which is buckled and deformed by a light collision.
For this reason, since the position of the reinforcing portion 55 is not displaced at the time of a light collision, a relative displacement is surely generated between the reinforcing portion 55 and the radiator support frame portion 56 at the time of a light collision, and the thin fracture portion 58 is surely broken. Will occur.
Further, since the reinforcing portion 55 is fixed to the front side frame 3 at the vehicle rear side position from the crash box 9, the collision load from the reinforcing portion 55 is transmitted to the front side frame 3 without being affected by the crash box 9. Will be.
Therefore, the protection performance of the radiator R at the time of a light collision can be improved more reliably, and the load distribution performance at the time of a heavy collision can also be improved.

  Next, a second embodiment will be described with reference to FIG. FIG. 12 is a front view of an automobile employing the automobile front structure according to the second embodiment. In addition, about the component similar to 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In this embodiment, the structure of the reinforcing portion 155 of the shroud panel 105 is different from that of the first embodiment, and the reinforcing portion 155A of the upper member portion 151 and the reinforcing portion 155C of the side portion 152 are not provided. The reinforcement part 155 is comprised.

  Thus, even when the reinforcing portion 155 is configured, the reinforcing portion 155 is fastened and fixed to the front side frames 3 and 3 and the apron rain members 4 and 4 as in the first embodiment. Dispersion performance of the collision load at the time of collision can be obtained in the same manner as in the first embodiment.

  Further, the thin broken portion 258 is also formed in a substantially gate shape at the boundary between the reinforcing portion 155 of the shroud panel 105 and the radiator support frame portion 156. For this reason, at the time of a light collision, a “break” occurs at the thin broken portion 258, and the radiator support frame portion 156 and the radiator R move to the vehicle rear side. Therefore, it is possible to prevent the radiator R from being damaged during a light collision.

  In this embodiment, in particular, since the reinforcement part of the lower part 153 is eliminated, the metal rain member 54 can be reduced, so that the shroud panel 105 can be made lighter than the first embodiment. Further, since the number of metal members to be insert-molded can be reduced, the shroud panel 105 can be easily formed.

Therefore, according to this embodiment, the weight of the front end of the vehicle can be reduced, and the operability of the vehicle can be improved. Moreover, the load transmission performance of the heavy collision of the shroud panel 105 can be enhanced without deteriorating the moldability of the shroud panel 105.
In addition, about another effect, it is the same as that of 1st embodiment.

  Next, a third embodiment will be described with reference to FIG. FIG. 13 is a detail view of a main part of the third embodiment corresponding to FIG. In addition, about the component similar to 1st embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In this embodiment, the structure of the boundary between the reinforcing portion 255 of the shroud panel 205 and the radiator support frame portion 256 is different from that of the first embodiment, and a rubber member 358 is interposed between the two companies. The rubber member 358 is interposed between the resin reinforcing portion 255 and the radiator support frame portion 256 by welding and fixing.

  As described above, by providing the rubber member 358 at the boundary between the reinforcing portion 255 and the radiator support frame portion 256, the rubber member 358 is elastically deformed in the event of a light collision as in the first embodiment, and the radiator Since the support frame portion 256 and the radiator R are relatively displaced with respect to the reinforcing portion 255, interference between the bumper beam 2 and the radiator R can be prevented.

  Further, even in the case of a heavy collision, the reinforcing portion 255 is fastened and fixed to the front side frames 3 and 3, the apron rain members 4 and 4 (see FIG. 6), and the perimeter frame 6 (see FIG. 4). The collision load acting on the vehicle 255 can be dispersed by the “underload path”, the “upper load path”, and the like, and the collision safety of the vehicle can be improved.

  In particular, in this embodiment, the rubber member 358 is elastically deformed to relatively displace the radiator support frame portion 256, so that the radiator R does not cause a “break” as in the shroud panel 5 of the first embodiment. Therefore, it is not necessary to replace the shroud panel 205 itself during a light collision.

Therefore, according to this embodiment, at the time of a light collision, it is not necessary to replace not only the radiator R but also the shroud panel 205, and the repair cost can be further reduced.
In addition, about another effect, it is the same as that of 1st embodiment.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The metal reinforcement of the present invention corresponds to the metal rain member 54 of the embodiment,
Similarly,
The heat exchanger corresponds to the radiator R,
The heat exchanger support section corresponds to the radiator support frame section 56, the radiator support frame section 156, and the radiator support frame section 256,
The fragile portion corresponds to the thin-walled fracture portion 58, the slit portion 158, the thin-walled fracture portion 258, and the rubber member 358,
The suspension cross member corresponds to the perimeter frame 6, but the present invention is not limited to the above-described embodiment, but includes an embodiment applied to the front structure of any automobile.

The front view of the motor vehicle which employ | adopted the front part structure of the motor vehicle of 1st embodiment. The front perspective view of a shroud panel. The top view of the front part structure of a motor vehicle. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. FIG. 5 is a detailed view of a main part of FIG. 4. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1. FIG. 7 is a detailed view of a main part of FIG. 6. FIG. 8 is a cross-sectional view showing a deformed state of the shroud panel when a collision load is applied, in which (a) is a cross-sectional view corresponding to FIG. 7, and (b) is a cross-sectional view corresponding to FIG. FIG. 4A is a plan view showing a deformed state of a front part of a vehicle body at the time of a collision, where FIG. FIG. 5A is a side view showing a deformed state of the front part of the vehicle body at the time of a collision, where FIG. The principal part detail drawing of other embodiment corresponding to FIG. The front view of 2nd embodiment corresponding to FIG. FIG. 8 is a detail view of a main part of the third embodiment corresponding to FIG. 7.

Explanation of symbols

R ... Radiator 1 ... Front bumper 2 ... Bumper beam 3 ... Front side frame 4 ... Apron rain members 5, 105, 205 ... Shroud panel 6 ... Perimeter frames 51, 151 ... Upper member parts 52, 152 ... Side parts 53, 153 ... Lower 54: Metal rain member 55 (55A, 55B, 55C, 55D), 155 (155A, 155B, 155C), 255 ... Reinforcement part 56, 156, 256 ... Radiator support frame part 58 ... Thin-wall fracture part 158 ... Slit part 258 ... Thin-walled fracture portion 358 ... Rubber member

Claims (9)

A resin shroud panel that includes an upper portion that extends in the vehicle width direction, a lower portion that extends in the vehicle width direction, a side portion that extends and connects the upper portion and the lower portion in the vertical direction, and supports the heat exchanger;
A front structure of an automobile comprising a front bumper extending in the vehicle width direction on the vehicle front side of the shroud panel,
The shroud panel includes a metal reinforcement and is fixed to a vehicle body member on the vehicle rear side from the front bumper,
A heat exchanger support that supports the heat exchanger, the front end of the reinforcement being positioned on the front side of the vehicle;
The front part structure of a motor vehicle provided with the weak part formed in the boundary of the said reinforcement part and the said heat exchanger support part. 2. The front structure of an automobile according to claim 1, wherein the fragile portion is constituted by a thin portion or a slit portion formed at a boundary between the reinforcing portion and the heat exchanger support portion. 2. The front structure of an automobile according to claim 1, wherein the fragile portion is constituted by a rubber portion formed at a boundary between the reinforcing portion and the heat exchanger support portion. The reinforcing part is continuously formed from the upper part to the side part,
Fix both side end portions of the reinforcing portion of the upper portion to apron rain members extending in the vehicle longitudinal direction at both side ends in the vehicle width direction,
The front part structure of the automobile according to any one of claims 1 to 3, wherein the reinforcing part of the side part is fixed to a front side frame extending in the vehicle front-rear direction. The reinforcing portion is formed on the upper portion, the side portion, and the lower portion so as to surround the heat exchanger,
Fix both side end portions of the reinforcing portion of the upper portion to apron rain members extending in the vehicle longitudinal direction at both side ends in the vehicle width direction,
The front part structure of the automobile according to any one of claims 1 to 3, wherein the reinforcing part of the side part is fixed to a front side frame extending in the vehicle front-rear direction. 6. The front structure of an automobile according to claim 5, wherein the reinforcing portion of the lower portion is fixed to a suspension cross member that supports the suspension device. The heat exchanger support part includes an upper frame part extending in the vehicle width direction, a lower frame part extending in the vehicle width direction, a horizontal frame part extending in the vertical direction and connecting the upper frame part and the lower frame part,
The front structure of an automobile according to any one of claims 1 to 6, wherein the horizontal frame portion is fixed to a bumper beam of the front bumper. The front structure of the automobile according to any one of claims 4 to 6, wherein a hood lock mechanism for locking the bonnet is provided in the reinforcing portion of the upper portion. The front part structure of the automobile according to any one of claims 1 to 8, wherein the vehicle body member to which the reinforcing portion is fixed is set to a vehicle body member at a vehicle rear side position from a crash box that absorbs collision energy.

Images