JP2007216706A - Front vehicle body structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the front vehicle body structure of a vehicle which disperses and absorbs an impact load with respect to a light impact load from the front without deteriorating durability against the impact load from a front hood. <P>SOLUTION: The front vehicle body structure is provided with a bumper member extending to the right and left direction of the vehicle on the back side of a bumper body disposed in front of the vehicle. The bumper member is composed of a first bumper member 3 positioned at the upper side, and a second bumper member 4 positioned at the lower side of the first bumper member 3. The first bumper member 3 and the second bumper member 4 are fixed to a vehicle body through a bracket 6 extending to the longitudinal direction of the vehicle body respectively, and the first bumper member 3 and a hood lock member 1 disposed in the vehicle width direction on the vehicle body side are connected through a hood lock brace 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a front body structure of a vehicle, and more particularly to a front body structure that effectively disperses and absorbs an impact applied to a support portion of a hood latch that locks a front hood.

  A hood latch for locking a front hood of an automobile is attached to a hood lock member disposed in the vehicle width direction so as to surround the front side of the engine room at the front upper edge of the vehicle body side. The hood lock member receives an impact force from the front hood through the hood latch when the front hood is closed. Therefore, the central part of the hood lock member is connected to the bumper member disposed on the back side of the bumper body by a hood lock brace which is a connecting member extending in the vertical direction, thereby supporting the impact force from the front hood in a distributed manner. (For example, Patent Document 1).

JP 2003-237626 A (see FIGS. 1 and 2)

  By the way, since the bumper member is disposed in front of the hood lock member, as disclosed in Patent Document 1, when the bumper member moves backward due to an impact from the front of the vehicle, the hood lock brace is pushed upward. Therefore, the hood lock member may be deformed. In order to prevent this, as disclosed in Patent Document 1, the lower end of the hood lock brace is detachably connected to the bumper member, and the hood lock brace is detached from a light impact load from the front. By doing so, it is sufficient that the impact load does not reach the hood lock member, but if this is done, durability against the impact load from the hood when the hood is closed cannot be obtained.

  The present invention solves the above-described problems, prevents the load from reaching the hood lock member with respect to a light impact load from the front without reducing the durability against the impact load from the front hood, and provides a strong impact load. In contrast, an object of the present invention is to provide a vehicle front body structure capable of dispersing and absorbing an impact load.

In order to solve the above-mentioned problems, the present invention provides a vehicle front body structure in which a bumper member extending in the left-right direction of a vehicle is provided on the back side of a bumper body disposed at the front of the vehicle. The first bumper member located on the side and the second bumper member located on the lower side of the first bumper member, and the first bumper member and the second bumper member are respectively connected via brackets extending in the front-rear direction of the vehicle body. The first bumper member and the hood lock member disposed in the vehicle width direction on the vehicle body side are connected via a hood lock brace.
Further, the present invention resides in that the first bumper member positioned above is disposed rearward in the front-rear direction of the vehicle with respect to the second bumper member.
Further, according to the present invention, the hood lock brace includes vertical walls extending in the front-rear direction of the vehicle on both side edges, and is connected to the first bumper member by a first bumper member fixing portion that connects the front edges of the vertical walls. The hood lock member is fixed to the hood lock member by a hood lock member fixing portion that connects the rear edges of the vertical walls.

According to the first aspect of the present invention, a plurality of bumper members are arranged on the back side of the bumper body, and the first bumper member and the hood lock member arranged on the upper side are connected, so that the bumper member is unnecessarily enlarged. The first bumper member can be disposed closer to the hood lock member. Therefore, the hood lock brace can be shortened, the hood lock member can be reinforced more effectively, and the hood lock brace can be prevented from interfering with other parts, and the arrangement of the parts in the front body of the vehicle is free. The degree can be improved.
According to the invention of claim 2, it is possible to vary the timing of shock absorption (deformation start timing) with respect to the impact load from the front between the first bumper member and the second bumper member from the positional relationship in the vehicle longitudinal direction. Become.
Further, in the case of a light impact load from the front, the impact load is first transmitted to the second bumper member, and the impact force is absorbed there. Therefore, if the retraction due to the impact force absorption is not large in the second bumper member, An impact does not act on the first bumper member, and there is no possibility that the impact force is transmitted to the hood lock member via the hood lock brace and the hood lock brace.
Therefore, even if the hood lock brace is provided with sufficient strength to increase the durability of the hood lock member, the hood lock member is not damaged under a light impact load.
According to invention of Claim 3, the impact force at the time of closing a hood can be efficiently transmitted to a 1st bumper member by a vertical wall. The hood lock member and the first bumper member are arranged at different positions in the front-rear direction of the vehicle. Since fixing portions are provided on the front and rear of the vertical wall, the hood lock member and the first bumper member are provided on these fixing portions. The bumper member can be easily connected and the load can be transmitted efficiently.

Hereinafter, a front body structure of a vehicle according to the present invention will be described in detail with reference to the drawings.
1 is a perspective view of a front body structure of a vehicle according to the present invention as viewed from the front of the vehicle body, FIG. 2 is a perspective view of the front body structure of the vehicle according to the present invention as viewed from the rear of the vehicle body, and FIG. FIG. 4 is an exploded perspective view of a front vehicle body structure of a vehicle according to the present invention. FIG. 4 is a perspective view showing a coupling state of a hood lock brace and a hood lock member reinforcement in the front vehicle body structure of the vehicle according to the present invention. 5 is a cross-sectional view conceptually showing the front body structure of the vehicle according to the present invention.

  1 and 2, the front body structure of the vehicle includes a hood lock member 1, a hood lock brace 2, a hood lock support member (first bumper member) 3, a bumper beam (second bumper member) 4, and the like. It is configured.

  The hood lock member 1 is disposed at the front upper edge of the vehicle body side in the vehicle width direction so as to surround the front side of the engine room, and left and right ends are side members (not shown) of the vehicle body, Is bound to. A front hood (not shown) is disposed on the upper side of the hood lock member 1 so as to cover the upper front part of the vehicle body.

The hood lock brace 2 is a sheet metal part having a vertical wall 2a and a first bumper member fixing portion, and a vertical wall 2a extending in the front-rear direction of the vehicle on both side edges and a front edge of the vertical wall 2a. Bumper member fixing part. As shown in FIG. 3, both side edges are provided with a vertical wall 2a extending in the front-rear direction of the vehicle. As shown in FIG. 5, the vertical wall 2a has a substantially square shape in the longitudinal direction. A flange 2b is formed on the periphery. As shown in FIG. 4, the hood lock brace 2 is disposed on both sides in the vehicle width direction so that the upper end of the vertical wall 2a sandwiches the hood rock clean force 5, and the vertical wall 2a and the flange 2b are spot welded. A is connected to the side surface 5a and the flange 5b of the hood rock clean force 5 by a. As shown in FIG. 5, the hood lock clean force 5 is overlapped and coupled to the vehicle rear side of the front vertical wall of the hood lock member 1 by bolts b, and the lower part of the hood lock brace 2 is connected by bolts b. The hood lock support member 3 is coupled to the vertical wall on the rear side. A hood latch 5c for detachably engaging the striker of the front hood is attached to the front side of the hood lock clean force 5 with a bolt b.
Since the vertical wall 2a and the flange 2b are respectively connected to the side surface 5a and the flange 5b by spot welding a, the hood lock brace 2 and the hood lock clean force 5 can be firmly connected, and therefore, as shown in FIG. As described above, even when the coupling position of the first bumper member fixing portion and the hood lock clean force 5 to the hood lock member 1 is shifted in the front-rear direction of the vehicle, the front hood input from the hood latch 5c The impact force can be transmitted to the hood lock support member 3.

The hood lock support member 3 includes an upper member 3a and a lower member 3b that extend in the vehicle width direction. As shown in FIG. 5, the upper member 3a and the lower member 3b are joined to each other by spot welding to form a closed cross section. 6 or a vertical wall to which the first bumper member fixing portion of the hood lock brace 2 is fixed.
As shown in FIGS. 1 and 2, the front end of the hood lock support bracket 6 is joined to the vertical wall of the hood lock support member 3 by arc welding, and the rear end of the hood lock support bracket 6 is joined by spot welding a. It is coupled to the bumper plate 7 (see FIG. 1). The bumper member plate 7 is coupled to the front end of a side member (not shown) or the like extending in front of the vehicle body by bolts.

  As shown in FIG. 3, the hood lock support bracket 6 includes a bracket body 6a having a U-shaped cross section perpendicular to the longitudinal direction (vehicle longitudinal direction), and a plate 6b for closing the opening. They are connected to each other by spot welding a to form a closed cross section. The bracket body 6a is formed with a plurality of beads 6c for adjusting the crushing load of the hood lock support bracket 6 in a direction perpendicular to the longitudinal direction (vehicle width direction). A plurality of beads 6d are formed in a direction perpendicular to the direction.

As shown in FIGS. 1 and 2, the bumper member bracket 8 has a front end coupled to the bumper beam 4 by arc welding, and a rear end of the bumper member bracket 8 is coupled to the bumper member plate 7 by spot welding a. Yes. That is, the hood lock support member 3 and the bumper beam 4 are coupled to the bumper member plate 7 via the hood lock support bracket 6 and the bumper member bracket 8, respectively, and have a welded integrated structure. By adopting a welded integrated structure, it is possible to improve the positional accuracy between them and to improve the assembly workability.
Further, as shown in FIG. 2, a bumper member stay 9 is disposed at a corner of the meeting portion of the bumper beam 4 and the bumper member bracket 8 on the vehicle center side, and one end of the bumper member stay 9 is arc welded c. The other end is connected to the bumper member bracket 8 by spot welding a. By providing the bumper member stay 9, when an impact load is applied obliquely from the front of the vehicle, the bumper beam 4 can be prevented from collapsing, and efficient energy absorption with respect to the impact load is possible.

  The bumper member bracket 8 is constituted by an outer bracket 8a and an inner bracket 8b having a U-shape, and these are coupled to each other by spot welding a to form a closed cross section. The hood lock support member 3 and the bumper beam 4 are arranged on the back side of the bumper main body (not shown) in the same direction as the bumper main body, that is, along the vehicle width direction, and the hood lock support member 3 is arranged on the upper side. The bumper member is configured, and the bumper beam 4 is disposed on the lower side with respect to the first bumper member so that the front surface protrudes slightly forward, thereby forming the second bumper member. An absorber (not shown) that is disposed between the bumper beam 4 and the bumper body and absorbs an impact load is attached to the front side of the bumper beam 4.

In the front vehicle body structure of the vehicle thus configured, as shown in FIG. 5, a radiator 10 is disposed below the hood lock member 1, and an air conditioner capacitor 11 is disposed in front of the radiator 10. The
In the front body structure of the vehicle, when an impact is applied to the bumper body from the front, the impact force is received by the absorber, the bumper beam 4 and the hood lock support member 3 through the bumper body. At that time, when the impact force is relatively weak, the impact force is absorbed by the absorber and the bumper beam 4 positioned forward without any impact force acting on the hood lock support member 3. The impact force can be prevented from being transmitted to the hood lock brace 2, the hood lock clean force 5, and the hood lock member 1.
Even if the bumper beam 4 is damaged, since the bumper member plate 7 and the vehicle body are detachably coupled with bolts, the bumper beam 4 has only to be repaired or replaced, so that the repair is easy.

If the impact force is applied to the hood lock support member 3 by deforming (shock absorbing) the bumper beam 4 and the bumper member bracket 8, the impact force is applied to the hood lock support member 3 and the hood lock support bracket 6. However, it is absorbed and is finally received by the vehicle body via the bumper member plate 7.
At that time, the impact force is absorbed by the deformation of the bead 6c, 6d formed on the hood lock support bracket 6 and the deformation of the hood lock support bracket 6.

According to the embodiment, the hood lock support member (first bumper member) 3 and the bumper beam (second bumper member) 4 are disposed on the back side of the bumper body, and the hood lock support member 3 disposed on the upper side. Since the hood lock member 1 is connected, the first bumper member can be disposed closer to the hood lock member without unnecessarily increasing the size of the bumper beam 4.
Since the hood lock support member 3 (first bumper member) can be disposed closer to the hood lock member, the hood lock brace 2 can be shortened and the hood lock member 1 can be reinforced more effectively.
Since the hood lock support member 3 as the first bumper member and the bumper beam 4 as the second bumper member are arranged so as to be shifted in the front-rear direction, it is possible to vary the timing of shock absorption with respect to the impact load from the front. It becomes. In particular, a light impact load from the front is first transmitted to the bumper beam 4 which is the second bumper member, and the impact force is absorbed there, so that the impact acts on the hood lock support member 3 which is the first bumper member. There is no possibility that the impact force is transmitted to the hood lock member 1 via the hood lock brace 2.
Therefore, even if the hood lock brace 2 has sufficient strength to enhance the durability of the hood lock member 1, the hood lock member 1 will not be damaged.
Furthermore, the impact force at the time of closing the front hood can be efficiently transmitted to the hood lock support member 3 which is the first bumper member by the vertical wall 2a of the hood lock brace 2. The hood lock member 1 and the hood lock support member 3 which is the first bumper member are arranged at different positions in the front-rear direction of the vehicle. Since the fixing portions are provided on the front and rear sides of the vertical wall 2a, these fixing portions are provided. In addition, the hood lock member 1 and the hood lock support member 3 can be easily connected, and the load can be transmitted efficiently. Therefore, repair costs can be reduced.
Furthermore, the hood lock brace 2 is composed of two parts that are spot welded so as to sandwich the hood lock clean force 5 at the upper end portion of the vertical wall 2a, so that the hood lock brace 2 having a complicated shape can be easily formed. Can be formed.
Further, the hood lock support bracket 6 is constructed by spot welding a U-shaped bracket body 6a that opens downward and a plate 6b that closes the opening, so that they are coupled to each other to form a closed cross section. Therefore, it is lightweight and sufficient rigidity can be obtained even with respect to a load in the vertical direction. The plate 6b can prevent the lower opening of the bracket body 6a from opening. Further, the bracket body 6a is formed with a plurality of beads 6c in a direction perpendicular to the longitudinal direction, and the plate 6b is also formed with a plurality of beads 6d in a direction perpendicular to the longitudinal direction. Energy can be efficiently absorbed by deformation of the beads 6c and 6d with respect to an impact load from the front of the vehicle body.

It is the perspective view which looked at the front part body structure of the vehicle concerning the present invention from the body front. It is the perspective view which looked at the front part body structure of the vehicle concerning the present invention from the body back. It is a disassembled perspective view of the front vehicle body structure of the vehicle which concerns on this invention. It is the perspective view which showed the coupling | bonding state of the hood lock brace and the hood lock member lean force in the front part vehicle body structure of the vehicle which concerns on this invention. It is sectional drawing which showed notionally the front part vehicle body structure of the vehicle which concerns on this invention.

Explanation of symbols

1 Hood Lock Member 2 Hood Lock Brace 2a Vertical Wall 2b Flange 3 Hood Lock Support Member (First Bumper Member)
3a Upper member 3b Lower member 4 Bumper beam (second bumper member)
5 Hood Lock Clean Force 5a Side Wall 5b Flange 5c Hood Latch 6 Hood Lock Support Bracket 6a Bracket Body 6b Plate 6c, 6d Bead 7 Bumper Member Plate 8 Bumper Member Bracket 8a Outer Bracket 8b Inner Bracket 9 Bumper Member Stay 10 Radiator 11 Condenser

Claims (3)

  In a vehicle front body structure in which a bumper member extending in the left-right direction of the vehicle is provided on the back side of a bumper body disposed in the front portion of the vehicle, the bumper member includes a first bumper member positioned on the upper side, and The first bumper member is composed of a second bumper member positioned below the first bumper member, and the first bumper member and the second bumper member are fixed to the vehicle body via brackets extending in the front-rear direction of the vehicle body, and the first bumper member And a hood lock member disposed in the vehicle width direction on the vehicle body side via a hood lock brace.   2. The vehicle front body structure according to claim 1, wherein the first bumper member located above is disposed rearward in the vehicle front-rear direction with respect to the second bumper member. The hood lock brace has vertical walls extending in the longitudinal direction of the vehicle on both side edges, and is connected to the first bumper member by a first bumper member fixing portion that connects the front edges of the vertical wall to each other, and the rear edge of the vertical wall The front body structure of a vehicle according to claim 1, wherein the hood lock member is fixed to the hood lock member by a hood lock member fixing portion that connects the two.

Images