JP2010000866A - Front body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front body structure of a vehicle that prevents the decrease of twisting rigidity of the front vehicle-body, the decrease of collision safety performance and the like, by securing the buckling function of front side frames and the like, while installing a supporting member that supports the front part of apron reinforcement, in a front body structure of the vehicle provided with a pair of right and left front side frames and crash cans at the front end portions thereof. <P>SOLUTION: Almost whole face of a joint flange face portion 22 is joined to a coupling flange portion 35. More specifically, the joint area is broadened to a high position higher than the frame position of the front side frame 1 to enhance the connection strength between the support member 20 and the front side frame 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a front body structure of a vehicle, and more particularly to a front body structure of a vehicle including a pair of left and right front side frames and a crash can at a front end portion thereof.

  2. Description of the Related Art Conventionally, there has been known a vehicle body structure including a pair of left and right front side frames extending in the vehicle front-rear direction and a crash can at a front end of the vehicle front portion. By adopting such a vehicle body structure, in the event of a vehicle collision, a collision load (hereinafter referred to as a front collision load) generated from the front of the vehicle is absorbed by buckling deformation of the crash can and the front side frame. Mitigates the impact on

  However, recently, in order to further improve the collision safety performance, it has been proposed to use a pair of left and right apron reinforcements disposed above the front side frame to reduce the influence of the front collision load.

  For example, in Patent Document 1 below, an apron reinforcement is connected to a bumper reinforcement installed in front of the front side frame via a connecting member so that the front impact load can be supported by the front side frame and the apron reinforcement. There are also proposals for supporting the front impact load in a distributed manner by connecting the support.

Patent Document 2 listed below also discloses a vehicle body structure in which a front end portion of an apron reinforcement positioned rearward due to the shape of the headlamp is supported on a front side frame by a support member (side stay) extending in the vertical direction. Yes.
JP 2005-231436 A JP 2007-091000 A

  By the way, as in Patent Document 1, when a front side frame and an apron reinforcement are connected to one pamper reinforcement, a front collision load is transmitted to the apron reinforcement even in a light collision, Repair costs may increase.

  Therefore, by installing an upper connecting member extending in the vehicle width direction in front of the apron reinforcement and connecting the upper connecting member and a pair of left and right apron reinforcements, a path different from the front side frame is used. It is conceivable to support the front impact load. In this way, by supporting the front collision load by another path, the front collision load does not act on the apron reinforcement in the case of a light collision, and thus an increase in repair cost can be prevented.

  In recent years, in-vehicle parts such as radiators are often positioned more forward than the front end of the front side frame, and the crash can at the front end of the front side frame is configured to be longer in the vehicle front-rear direction. In the case of a light collision, it is considered that the radiator is configured to move backward to reduce the repair cost.

  However, if the apron reinforcement is separated from the front side frame and a long crash can is provided in front of the front side frame, the pamper reinforcement will not function as the skeleton member of the vehicle body. The torsional rigidity of the vehicle may be reduced, which may cause deterioration of vehicle body vibration and maneuverability. Further, if the apron reinforcement and the front side frame remain separated from each other, they may be deformed apart at the time of collision, and the shock absorbing performance at the time of collision may be deteriorated.

  For this reason, for example, like the support member disclosed in Patent Document 2, the front end of the apron reinforcement and the front side frame are connected by a support member extending in the vertical direction, so that the upper connection extending in the vehicle width direction is connected. It is conceivable to increase the torsional rigidity of the front part of the vehicle body and improve the shock absorbing performance by using the member as a skeleton member.

  However, if the stay member is directly connected to the upper surface or side surface of the front side frame, the connecting portion cannot be effectively used as the front side frame, and the amount of buckling deformation or the like may be reduced. On the other hand, if the number of connecting portions is reduced, there arises a problem that a reduction in torsional rigidity of the front portion of the vehicle body cannot be sufficiently prevented.

  Therefore, the present invention provides a front body structure of a vehicle having a pair of left and right front side frames and a crash can at the front end thereof, while setting a support member for supporting the front portion of the apron reinforcement. An object of the present invention is to provide a vehicle front body structure that can secure a buckling function of a frame and prevent a decrease in torsional rigidity and a decrease in collision safety performance of the vehicle body front.

A vehicle body structure of a vehicle according to the present invention includes a pair of left and right front side frames installed to extend in the vehicle front-rear direction below an engine room, and a crash can coupled to the front end portion of the front side frame. A pair of left and right apron reinforcements installed so as to extend in the front-rear direction above the front side frame, and extending between the front parts of the apron reinforcements in the vehicle width direction. A connecting member installed so as to be connected, a supporting member that extends and supports a connecting portion between the apron reinforcement and the connecting member, and the supporting member is connected to the crash can of the front side frame. It is joined to the flange part.
According to the above configuration, the support member can be joined to the front side frame by using the flange portion that joins the crush can by joining the support member to the flange portion that joins the crush can.
For this reason, the flange part which couple | bonds a crash can can be used effectively, and the joint strength to the front side frame of a support member can be raised.

In one embodiment of the present invention, the joint portion of the support member is configured to be fastened and fixed together with a mounting bolt of the crash can.
According to the above configuration, the joint portion of the support member is fastened and fixed to the flange portion of the front side frame with the mounting bolt of the crash can.
Therefore, the coupling strength between the support member and the front side frame can be further increased using the mounting bolt of the crash can.

In one embodiment of the present invention, the support member can be joined to the flange portion of the front side frame in the vehicle width direction extending in the vehicle width direction, and the longitudinal direction extending in the vehicle longitudinal direction from the end of the joint flange surface portion. And an open section member having a surface portion.
According to the above configuration, since the support member is constituted by the open cross-section member including the joint flange surface portion extending in the vehicle width direction and the front-rear direction surface portion extending in the front-rear direction, the support member is at least an open cross section having an L-shaped cross section. Will have.
For this reason, since the support member has an open cross-section while enhancing the support rigidity in the vehicle longitudinal direction and the vehicle width direction of the support member, when a front impact load is applied, the support member is easily deformed, The amount of buckling deformation of the front side frame can be secured.
Therefore, it is possible to maintain the shock absorbing performance of the front side frame while increasing the support rigidity of the support member.
The front-rear direction surface portion may be joined to the side surface of the front side frame. However, when this front-rear direction surface portion is joined to the vehicle width outer surface of the front side frame, the vehicle width between the front side frames is considered. Since a large space on the inner side can be secured, on-vehicle components such as a radiator can be easily laid out.

In one embodiment of the present invention, the front-rear direction surface portion of the support member is joined to the vehicle width inner surface of the front side frame, and the vehicle extends from the rear end portion of the front-rear direction surface portion outward in the vehicle width direction. A width direction surface portion is provided.
According to the said structure, a support member can be located in the vehicle width inner side of a front side frame by joining the front-back direction surface part of a support member to the vehicle width inner surface of a front side frame. Moreover, the support member can be joined also to the upper surface of the front side frame by providing the support member with a vehicle width direction surface portion extending outward in the vehicle width direction.
Therefore, since the attachment span between the left and right support members can be made compact, the support rigidity of the support members can be increased, and the torsional rigidity of the front portion of the vehicle body can be further increased. Moreover, since the range joined to a front side frame can be expanded, the joint strength of a supporting member and a front side frame can also be improved.

In one embodiment of the present invention, the joint flange surface portion is provided so as to extend inward in the vehicle width direction from the front end portion of the front-rear direction surface portion.
According to the above configuration, since the joint flange surface portion extends inward in the vehicle width direction, the pair of left and right support members can be positioned on the vehicle width inward side and joined to the front side frame.
Therefore, the attachment span between the left and right support members can be made more compact, and the support rigidity of the support members can be increased.

In one embodiment of the present invention, a subframe is provided below the pair of left and right front side frames, and a second crush can is provided at the front end of the subframe.
According to the above configuration, by providing the second crush can in the sub-frame located below the front side frame, the front collision load can be absorbed using the sub-frame.
Therefore, the impact absorption performance at the time of a collision can be improved by utilizing the crash can, the connecting member, and the second crash can.

In one embodiment of the present invention, the crush can, the second crush can, and the connecting member are arranged in this order from the front side of the vehicle.
According to the above configuration, since the crash can, the second crash can, and the connecting member are positioned in this order from the front side of the vehicle, at the time of a frontal collision, the crash can, the second crash can, and the connecting member in stages. The impact load can be absorbed.
Therefore, the absorption amount of the collision load can be increased stepwise, and the impact absorption performance corresponding to the degree of collision can be obtained.

In an embodiment of the present invention, the apron reinforcement is narrowed forward so that a front portion of the apron reinforcement connected by the connecting member is located at a position substantially coincident with the front side frame in plan view. It is formed so as to be inclined.
According to the above configuration, since the apron reinforcement is inclined so that the front portion thereof substantially coincides with the front side frame in plan view, when receiving a front impact load, regardless of the collision angle, As with the front side frame, it is possible to transmit the collision load to the apron reinforcement, and the shock absorbing performance can be improved more stably.
Therefore, when receiving the front impact load by the front side frame and the apron reinforcement, it is possible to more securely absorb the impact.

  According to the present invention, it is possible to effectively use the flange portion that couples the crash can to increase the strength of coupling the support member to the front side frame.

  Therefore, in a front body structure of a vehicle having a pair of left and right front side frames and a crash can at the front end thereof, a buckling of the front side frame is set while setting a support member that supports the front part of the apron reinforcement. By securing the function, it is possible to prevent a decrease in torsional rigidity at the front of the vehicle body and a decrease in collision safety performance.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a front perspective view of a front body structure of a vehicle according to an embodiment employing the present invention, FIG. 2 is a front view of the front body structure, and FIG. 3 is a side view of the front body structure. FIG. 4 is a plan view of the front vehicle body structure.

  As shown in FIG. 1, an engine room ER that houses an engine (not shown) or the like is provided at the front portion of the vehicle V, and is a skeleton member of the vehicle body at the lower part of both sides in the vehicle width direction. A pair of left and right front side frames 1, 1 extending in the vehicle front-rear direction are provided.

  A pair of left and right main crash cans 2, 2 that similarly extend in the vehicle front-rear direction are installed at the front end portions of the front side frames 1, 1. A bumper reinforcement 3 is installed.

  Further, a pair of left and right apron reinforcements 4 and 4 which are skeleton members of the vehicle body constituting the upper edge of the engine room ER are installed above the front side frames 1 and 1. As shown in FIG. 4, the apron reinforcements 4 and 4 have an inclined portion 4 </ b> A that is inclined so as to narrow toward the vehicle width inward in a plan view, and a linear portion that extends in the front-rear direction at the rear portion. 4B is formed. The front end portion 4Aa of the apron reinforcement 4 is set so as to substantially coincide with the position of the front portion of the front side frames 1 and 1.

  Further, an upper connection reinforcement 5 extending in the vehicle width direction is connected to the front end 4Aa of the apron reinforcement 4. The upper connection reinforcement 5 is constituted by an open cross-section member having a double-hat cross section so as to have rigidity as a skeleton member of the vehicle body.

  Further, a sub-frame 6 that supports a suspension arm or the like (not shown) of the front suspension device is installed below the front side frames 1 and 1. Although not specifically shown, the sub-frame 6 is configured by a substantially well-shaped frame body in a plan view and ensures the support rigidity of the suspension arm.

  As shown in FIG. 3, the sub-frame 6 is firmly fastened and fixed to the front end 1a and the rear end 1b of the front side frame 1 by mounting bolts B via elastic mount members M, respectively.

  In addition, a pair of left and right sub-crash cans 7 and 7 extending in the vehicle front-rear direction are installed at the front end portion of the sub-frame 6 (only one is disclosed in FIG. 3). A sub-bumper reinforcement 8 extending in the vehicle width direction is also installed at the front ends of the sub-crash cans 7 and 7.

  As shown in FIG. 1, suspension towers 9, 9 that are provided upright in the vertical direction are provided at the lateral positions of the front side frames 1, 1 at the center in the vehicle longitudinal direction. The suspension tower 9 has a substantially cylindrical space for accommodating a damper device (not shown).

  The above apron reinforcements 4 and 4 are installed outside the vehicle width side of the suspension towers 9 and 9, and as shown in FIG. 4, the inclined part 4A and the straight part 4B are provided. The intersecting bent portions 4C are set so as to be located just to the side.

  A wheel apron 10 that extends in a substantially vertical direction and spreads in a wall shape is provided on the front side of the suspension towers 9 and 9. The wheel apron 10 bulges in an arc shape corresponding to a front wheel shape (not shown).

  In addition, a dash panel 11 that partitions the compartment CR and the engine room ER is installed behind the engine room ER. The dash panel 11 extends in the vertical direction and the vehicle width direction, and is configured so that both ends are joined to the rear side of the suspension towers 9 and 9.

  A tunnel opening 12 that is recessed upward is formed at the center lower portion of the dash panel 11. The tunnel opening 12 is formed to guide an exhaust pipe or the like (not shown) extending from the engine room ER to the vehicle rear side.

  A cowl box 13 extending in the vehicle width direction is installed on the upper part of the dash panel 11, and the rear ends of the pair of left and right apron reinforcements 4, 4 are connected using the cowl box 13. Further, the cowl box 13 is joined at both ends to the roots of a pair of left and right front pillars (not shown), and also functions as a skeleton member for increasing the vehicle body rigidity.

  Further, a radiator (not shown) is installed at a position behind the bumper reinforcement 3 and ahead of the upper connection reinforcement 5. In this way, by setting the radiator in front of the upper connection reinforcement 5, the longitudinal length L1 of the main crash can 2 is set to be relatively long in order to secure a backward space when the radiator collides. is doing. Specifically, as shown in FIG. 3, the sub-crash can 7 is formed to be about twice as long as the length L2.

For this reason, the distance between the front end portion 1c of the front side frames 1 and 1 and the bumper reinforcement 3 is increased, and the rigidity of the main crash can 2 is also low, so that the front side frame 1 front portion of the bumper reinforcement 3 is low. As a result, the torsional rigidity of the front portion of the vehicle body including the front side frame 1 is lowered.
If the pair of left and right front side frames 1 and 1 and the pair of left and right apron reinforcements 4 and 4 are not connected, the front side frames 1 and 1 and the apron reinforcement 4 and 4 will be used in the front collision. Since 4 is freely deformed without being constrained, there is a possibility that the shock absorbing performance is also lowered.

  For this reason, in the present embodiment, a support member 20 is provided to extend and connect the front end portion 1c of the front side frame 1 and the connection portion 14 of the apron reinforcement 4 and the upper connection reinforcement 5 in the vertical direction. Yes.

  That is, by providing the support member 20, the front end portion 1c of the front side frame 1 can be connected to the connection portion 14 of the apron reinforcement 4 and the upper connection reinforcement 5, so that the front end portion 1c of the front side frame 1 is The restraining force is increased, and the torsional rigidity of the vehicle body can be increased, and the shock absorbing performance can be improved.

  The detailed structure of the support member 20 will be described with reference to FIGS. FIG. 5 is a perspective view of the vicinity of the support member as viewed from the lower inner side of the engine room, FIG. 6 is an exploded perspective view of FIG. 5, and FIG. 7 excludes an apron reinforcement and the like as viewed from the outer upper side of the engine room. FIG.

  As shown in FIG. 5, the front side frame 1 has a closed cross section that extends in the vehicle front-rear direction by joining a flat outer panel 31 and an inner panel 32 having a substantially hat cross section with upper and lower joint flanges 33 and 34. It consists of a frame body. The front side frame 1 is configured to buckle and deform by buckling deformation means (not shown) when a front collision load is applied.

  At the front end of the front side frame 1, a connecting flange portion 35 of the main crush can 2 is provided so as to extend in the vehicle width direction and the vertical direction. That is, a flange (35) extending in a direction orthogonal to the extending direction of the front side frame 1 is provided at the front end of the front side frame 1.

  As shown in FIG. 7, a fastening flange portion 41 is provided on the main crush can 2 side so as to correspond to the connecting flange portion 35. The fastening flange portion 41 is configured by a substantially rectangular plate material joined to the base portion of the main crash can 2, and the front collision load received by the main crash can 2 at the fastening flange portion 41 is the front side frame 1. It is configured to transmit to.

  The main crush can 2 is formed of a rectangular cylindrical body having a substantially rectangular closed cross section, and is formed of a relatively fragile plate material. For this reason, when a front impact load is received from the bumper reinforcement 3, it easily buckles and absorbs the impact.

  As shown in FIG. 5, a frame fastening portion 36 for fastening and fixing the subframe 6 is provided below the front portion of the front side frame 1. The frame fastening portion 36 is configured by joining a substantially box-shaped bracket member to the lower surface of the front side frame 1, specifically, the lower surface of the inner panel 32.

  Above the front side frame 1, the above-described apron reinforcement 4 is installed so as to extend substantially in the vehicle front-rear direction. The apron reinforcement 4 is also configured to have a closed cross section by joining the upper panel 51 having a substantially hat cross-section and the lower panel 52 having a substantially L-shaped cross section by joining flanges 53 and 54.

  Above the front end of the apron reinforcement 4, an upper connection reinforcement 5 extending in the vehicle width direction is installed. The upper connection reinforcement 5 is configured by a member body that is bent into a substantially crank shape. The upper connection reinforcement 5 is made of a relatively high-rigidity steel material because it is necessary to transmit the load to the left and right apron reinforcements 4 and 4 in response to a front collision load. Although not specifically shown, a bonnet latch for locking the bonnet striker is installed at the center of the upper connection reinforcement 5.

  Below the connecting portion 14 between the apron reinforcements 4 and 4 and the upper connecting reinforcement 5, the support member 20 described above is installed.

  As shown in FIG. 6, the support member 20 includes a base surface portion 21 that extends in the vehicle front-rear direction, a joint flange surface portion 22 that extends inward from the front end of the base surface portion 21, and a rear end of the base surface portion 21. A substantially crank-shaped open cross-section bracket member comprising a vehicle width direction surface portion 23 extending outward in the width direction and a rear outer surface portion 24 extending from the vehicle width outer end of the vehicle width direction surface portion 23 toward the vehicle rear side. is doing.

Further, upper joint portions 25a, 25b, and 25c that are joined to the lower surface of the apron reinforcement 4 are respectively attached to the upper end of the joint flange surface portion 22, the upper end of the base surface portion 21, and the upper end of the vehicle width direction surface portion 23. It is bent to the rear side or the vehicle width inward side.
Furthermore, lower joint portions 26 a and 26 b that are joined to the front side frame 1 side are also formed at the lower end of the base surface portion 21 and the lower end of the vehicle width direction surface portion 23. Of these, only the lower joint portion 26b of the vehicle width direction surface portion 23 is bent toward the vehicle rear side.

  The joining flange surface portion 22 is joined to the connecting flange portion 35 almost entirely. That is, the joining range is expanded to a higher position above the frame position of the front side frame 1, and the bonding strength between the support member 20 and the front side frame 1 is increased.

  In particular, the connecting flange portion 35 is formed with an upwardly extending portion 35a that protrudes upward, thereby further extending the joining range of the joining flange surface portion 22 upward.

  The lower joint portion 26a of the base surface portion 21 is joined to the vehicle width inner side surface 1A of the front side frame 1 as shown in FIG. Further, the lower joint portion 26 b of the vehicle width direction surface portion 23 is joined to the upper surface 1 B of the front side frame 1.

  Thus, by joining the support member 20 to the vehicle width inner side surface 1A and the upper surface 1B of the front side frame 1, the front-rear direction position and the vehicle width direction position of the support member 20 can be defined reliably. For this reason, the support rigidity by the support member 20 can be improved.

  The connecting flange portion 35 and the fastening flange portion 41 are formed with a plurality of through holes 37 and 42 through which the fastening bolts S pass (see FIGS. 2, 6, and 7). Further, the support member 20 is also formed with a through hole 27 so as to correspond to the through hole 37 of the connecting flange portion 35 (see FIG. 6).

  These through holes 37 and 42 are holes for fastening and fixing the main crash can 2 to the front side frame 1. The fastening bolts S are inserted into the through holes 37 and 42 so that the main crash can 2 is attached to the front side frame 1. The frame 1 is fastened and fixed.

  By forming the through hole 37 in the support member 20, the support member 20 and the main crush can 2 can be fastened and fixed to the connecting flange portion 35, and the support member 20 is attached to the front side frame 1. The bond strength can be further increased.

  The upper portion of the support member 20 is joined to the lower surface of the apron reinforcement 4 by a plurality of upper joint portions 25a, 25b, and 25c. The upper joint portions 25a, 25b, and 25c are joined in a substantially crank shape. By doing this, it is possible to reliably suppress the movement of the apron reinforcement 4 and the upper connection reinforcement 5 in the vehicle front-rear direction and in the vehicle width direction.

  In contrast to this embodiment, the upper connection reinforcement 5 may be installed below the apron reinforcement 4 so that the upper part of the support member 20 is joined to the upper connection reinforcement 5. . Also in this case, the support function of the support member 20 can be obtained similarly.

  Next, the effect of improving the torsional rigidity of the vehicle body by providing the support member 20 will be described with reference to FIG. 8A is a model diagram of the vehicle body front portion of the conventional structure, and FIG. 8B is a model diagram of the vehicle body front portion of the present embodiment. In addition, each component of a model figure attaches | subjects the same code | symbol, and abbreviate | omits description.

As shown in (a), for example, when a support member 20 ′ that connects the apron reinforcement 4 and the front side frame 1 is joined only to the front side frame 1, the side surface 1 </ b> A of the front side frame 1 is used. Or it is only joined to the upper surface (the model diagram shows only the side surface).
Therefore, between the lower structure Z1 constituted by the front side frames 1 and 1 and the subframe 6 and the upper structure Z2 constituted by the apron reinforcements 4 and 4 and the upper connection reinforcement 5. When a torsional load around the vehicle body central axis P is applied, a force in the peeling direction is applied between the support member 20 'and the front side frame 1, and deformation occurs even with a relatively small load. Thus, the torsional deformation of the vehicle body occurs.

On the other hand, as shown in (b), when joining the support member 20 to the connecting flange portion 35 extending in the vehicle width direction and the vertical direction, the joint surface extends in the vehicle width direction and the vertical direction. Become.
For this reason, when a torsional load around the vehicle body central axis P acts between the lower structure Z1 and the upper structure Z2, a force in the shear direction is generated between the support member 20 and the connecting flange portion 35. Therefore, even when a large load is applied, deformation is unlikely to occur, and torsional deformation of the vehicle body can be suppressed.

  Thus, in this embodiment, the torsional rigidity of the vehicle body can be increased by setting the joint surface of the support member 20 to extend in the vehicle width direction and the vertical direction.

  For this reason, high torsional rigidity can be obtained even if the joining range to the upper surface 1B and the side surface 1A of the front side frame 1 is small.

  Therefore, the support member 20 can be connected to the front side frame 1 without hindering buckling deformation of the front side frame 1 at the time of collision as much as possible.

  Next, the deformation behavior of the front body structure at the time of the front collision will be described with reference to FIG. 9A is a schematic side view before the front collision, FIG. 9B is a schematic side view of the initial front collision, FIG. 9C is a schematic side view of the middle of the front collision, and FIG. FIG. In addition, each component of this schematic diagram also attaches | subjects the same code | symbol, and abbreviate | omits description.

As shown to (a), the front side frame 1, the apron reinforcement 4, and the sub-frame 6 are installed in the vehicle body front part V1 so that it may extend in the vehicle front-back direction. The can 2, the sub-crash can 7, and the upper connection reinforcement 5 are installed. A support member 20 is installed between the front side frame 1 and the apron reinforcement 4.
A collision (front collision) occurs when the collision target W approaches the front portion V1 of the vehicle body from the front.

Thereafter, as shown in (b), when the collision target W collides with the vehicle body front portion V1, first, only the main crash can 2 starts buckling deformation at the beginning of the collision, and only the front side frame 1 is moved forward. Impact load is applied. Due to the buckling deformation of the main crash can 2, the radiator (not shown) also moves backward.
Here, since the main crash can 2 is set long, in the case of a light collision, only the main crash can 2 is deformed, and the repair cost can be reduced.

When the collision further proceeds, as shown in (c), the sub-crash can 7 also starts buckling deformation, and a front collision load acts on the sub-frame 6. Thus, the front impact load acts on the subframe 6 as well, so that the front impact load can be supported by the plurality of frame bodies (1, 6), and the impact absorption performance can be improved.
In addition, while the sub-crash can 7 is configured to be short, the rear end position is substantially coincident with the main crash can 2 in the vehicle front-rear direction, so that the main crash can be prevented without hindering the buckling deformation behavior of the main crash can 2. All the cans 2 can be buckled and deformed.

  Furthermore, in the case of a large collision, as shown in (d), the collision target W collides with the upper connection reinforcement 5 and a collision load acts on the apron reinforcement 4. As described above, the front impact load acts on the apron reinforcement 4 as well, so that more frame bodies (4, 1, 6) can support the front impact load and absorb the shock according to the degree of collision. Performance can be increased.

  Further, since the support member 20 is connected to the front side frame 1, the deformation behavior of the apron reinforcement 4 is stabilized, and the collision characteristics of the vehicle can be stabilized.

  Further, when such a large collision occurs, the front side frame 1 is also buckled and deformed. However, since the support member 20 is joined to the connecting flange portion 35, the buckling deformation of the front side frame 1 is hardly affected. The support member 20 can be coupled without giving any.

  In addition, the front portion of the apron reinforcement 4 is formed so as to be inclined narrowly forward as described above in a plan view, and is formed so as to substantially coincide with the position of the front side frame 1. Even when an offset load is applied, the front side frame 1 and the apron reinforcement 4 are deformed almost simultaneously, and a stable collision behavior can be obtained.

Next, the effect of this embodiment comprised in this way is demonstrated.
In this embodiment, the support flange 20 that connects the main crush can 2 of the front side frame 1 to the support member 20 that extends and supports the connection portion 14 of the apron reinforcement 4 and the upper connection reinforcement 5 in the vertical direction. 35.
Thereby, the support member 20 can be joined to the front side frame 1 by using the connecting flange portion 35 that couples the main crush can 2.
For this reason, the coupling | bonding flange part 35 which couple | bonds the main crush can 2 can be used effectively, and the coupling | bonding strength to the front side frame 1 of the support member 20 can be raised.

  Therefore, a support member 20 that supports the front portion of the apron reinforcement 4 is set in a vehicle body structure including a pair of left and right front side frames 1 and 1 and main crash cans 2 and 2 at the front end thereof. However, the buckling function and the like of the front side frame 1 can be ensured to prevent the torsional rigidity of the front part of the vehicle body from being lowered and the collision safety performance from being lowered.

In this embodiment, the joint flange surface portion 22 of the support member 20 is fastened and fixed together with the fastening bolt S of the main crash can 2.
Accordingly, the joint flange surface portion 22 of the support member 20 is fastened and fixed to the connecting flange portion 35 of the front side frame 1 by the fastening bolt S of the main crush can 2.
Therefore, the coupling strength between the support member 20 and the front side frame 1 can be further increased by using the fastening bolt S of the main crash can 2.

Moreover, in this embodiment, the support member 20 extends in the vehicle front-rear direction from the joint flange surface portion 22 extending in the vehicle width direction that can be coupled to the connection flange portion 35 of the front side frame 1 and the end portion of the joint flange surface portion 22. And an open section member having a base surface portion 21.
Thereby, since the support member 20 is comprised by the open cross-section member provided with the joining flange surface part 22 and the base surface part 21, the support member 20 has an open cross section of cross-section L shape at least.
For this reason, since the support member 20 has an open cross-section while increasing the support rigidity of the support member 20 in the vehicle longitudinal direction and the vehicle width direction, the support member 20 is easily deformed when a front impact load is applied. Thus, the buckling deformation of the front side frame 1 is not hindered.
Therefore, the impact absorption performance of the front side frame 1 can be maintained while increasing the support rigidity of the support member 20.
In this embodiment, the base surface portion 21 is joined to the vehicle width inner side surface 1A of the front side frame 1, but may be joined to the vehicle width outer side surface. As described above, when the base surface portion 21 is joined to the vehicle width outer side surface of the front side frame 1, a vehicle width inner side space between the front side frames 1 and 1 can be secured widely. Easy layout.

Further, in this embodiment, the base surface portion 21 of the support member 20 is joined to the vehicle width inner side surface 1A of the front side frame 1, and the vehicle width direction surface portion 23 extending from the rear end of the base surface portion 21 to the vehicle width outer side. Is provided.
Thereby, the support member 20 can be positioned on the vehicle width inward side of the front side frame 1. Further, by providing the support member 20 with the vehicle width direction surface portion 23 extending outward in the vehicle width direction, the support member 20 can be joined also to the upper surface 1B of the front side frame 1.
Therefore, since the mounting span between the left and right support members 20 and 20 can be made compact, the support rigidity of the support member 20 can be increased, and the torsional rigidity of the front portion of the vehicle body can be further increased. Moreover, since the range joined to the front side frame 1 can be expanded, the coupling strength between the support member 20 and the front side frame 1 can also be improved.

Further, in this embodiment, the joint flange surface portion 22 of the support member 20 is provided so as to extend from the front end of the base surface portion 21 toward the vehicle width inward side.
Thereby, since the joining flange surface part 22 extends in the vehicle width inward side, the pair of left and right support members 20, 20 can be positioned on the vehicle width inward side and joined to the front side frames 1, 1. .
Therefore, the attachment span between the left and right support members 20 and 20 can be made more compact, and the support rigidity of the support member 20 can be increased.

In this embodiment, a sub frame 6 is provided below the pair of left and right front side frames 1, 1, and a sub crash can 7 is provided at the front end of the sub frame 6.
Thereby, the sub-frame 6 can also be utilized to absorb the front collision load.
Therefore, the impact absorption performance at the time of a collision can be improved by using the main crash can 2, the upper connection reinforcement 5 and the sub crash can 7, respectively.

In this embodiment, the main crash can 2, the sub crash can 7, and the upper connection reinforcement 5 are arranged in this order from the front side of the vehicle.
Thereby, at the time of a frontal collision, a collision load can be absorbed in order of the main crash can 2, the sub crash can 7, and the upper connection reinforcement 5.
Therefore, the absorption amount of the collision load can be increased step by step, and the impact absorption performance corresponding to the degree of collision can be obtained.

Further, in this embodiment, the apron is positioned such that the front portions of the apron reinforcements 4 and 4 connected by the upper connection reinforcement 5 are located at positions substantially coincident with the front side frames 1 and 1 in plan view. Reinforcements 4 and 4 are formed so as to be inclined (4a and 4a) narrowly forward.
As a result, when receiving a front impact load, it becomes possible to transmit the impact load to the apron reinforcements 4 and 4 in the same manner as the front side frames 1 and 1 regardless of the angle of the impact. Shock absorption performance can be improved.
Therefore, when the front side frames 1 and 1 and the apron reinforcements 4 and 4 receive the front impact load, it is possible to more reliably absorb the impact.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The connecting member of the present invention corresponds to the upper connecting reinforcement 5 of the embodiment,
Similarly,
The crash can corresponds to the main crash cans 2 and 2,
The support member corresponds to the support member 20,
The joint corresponds to the joint flange surface 22,
The front-rear direction surface portion corresponds to the base surface portion 21,
The second crash can corresponds to sub-crash cans 7 and 7,
The present invention is not limited to the above-described embodiments, but includes embodiments applied to the front body structure of any vehicle.

1 is a front perspective view of a front body structure of a vehicle according to an embodiment employing the present invention. The front view of a front body structure. The side view of a front body structure. The top view of a front body structure. The perspective view of the support member vicinity seen from the engine room lower inner side. FIG. 6 is an exploded perspective view of FIG. 5. The perspective view of the support member vicinity except the apron reinforcement etc. which were seen from the engine room upper part outer side. (A) is the model figure of the vehicle body front part of a conventional structure, (b) is the model figure of the vehicle body front part of this embodiment. (A) is a schematic side view before the front collision, (b) is a schematic side view at the initial stage of the front collision, (c) is a schematic side view of the middle stage of the front collision, and (d) is a schematic side view of the late stage of the front collision.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Front side frame 2 ... Main crush can 4 ... Apron reinforcement 5 ... Upper connection reinforcement 6 ... Sub frame 7 ... Sub crush can 20 ... Support member 22 ... Joint flange surface part 35 ... Connection flange part

Claims (8)

A front body structure of a vehicle comprising a pair of left and right front side frames installed to extend in the vehicle front-rear direction below the engine room, and a crash can coupled to the front end of the front side frame,
A pair of left and right apron reinforcements installed to extend in the vehicle longitudinal direction above the front side frame;
A connecting member installed so as to extend and connect between the front parts of the apron reinforcement in the vehicle width direction;
A support member that extends and supports a connecting portion between the apron reinforcement and the connecting member;
A front vehicle body structure of a vehicle in which the support member is joined to a flange portion that joins the crash can of the front side frame. The vehicle front body structure according to claim 1, wherein the joint portion of the support member is configured to be fastened and fixed together with a mounting bolt of a crash can. A joint flange surface portion extending in a vehicle width direction capable of joining the support member to the flange portion of the front side frame;
A front-rear surface portion extending in the vehicle front-rear direction from an end of the joint flange surface portion;
The front vehicle body structure of a vehicle according to claim 1 or 2, wherein the vehicle front body structure is formed of an open cross-sectional member having While joining the front-rear direction surface portion of the support member to the vehicle width inner surface of the front side frame,
The vehicle front body structure according to claim 3, further comprising a vehicle width direction surface portion extending outward from the rear end portion of the front and rear direction surface portion in the vehicle width direction. The vehicle front body structure according to claim 4, wherein the joint flange surface portion is provided so as to extend inward in the vehicle width direction from a front end portion of the front-rear direction surface portion. A subframe is provided below the pair of left and right front side frames,
The vehicle front body structure according to any one of claims 1 to 5, wherein a second crash can is provided at a front end of the subframe. The vehicle front body structure according to claim 6, wherein the front vehicle body structure is installed so as to be positioned in the order of the crash can, the second crash can, and the connecting member from the front side of the vehicle. The apron reinforcement that is connected by the connecting member is formed so that the apron reinforcement is inclined to be narrowed forward so that a front portion of the apron reinforcement is positioned at a position that substantially coincides with the front side frame in plan view. The front body structure of the vehicle according to any one of 1 to 7.

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