JP2009269491A - Rear structure of vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear structure of a vehicle body adapted to satisfactorily absorb a shock load in the event of an impact with the other vehicle having a different height, and also inhibit the other vehicle from entering the rear structure of the vehicle body. <P>SOLUTION: The rear part structure 10 of the vehicle body is provided with an upper cross member 31 disposed in a rear panel 15; and a lower cross member 32 in which left and right legs 51 and 52 are vertically suspended from left and right ends of the upper cross member 31, respectively, and a lower beam 53 is suspended between lower ends of the left and right legs 51 and 52. A substantially rectangular frame-like skeleton 16 is formed of the upper cross member 31 and the lower cross member 32. Substantially middle parts in the vertical direction of the left and right legs 51 and 52 in the frame-like skeleton 16 are connected through the rear panel 15 to rear ends of left and right rear side frames 11 and 12, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body rear structure in which a rear panel is bridged between rear end portions of left and right rear side frames.

Among vehicle body rear structures, a structure in which a lower back panel is provided at a rear end portion of a rear side frame and a rear bumper beam is provided at a rear portion of the lower back panel via a crash box (impact absorbing member) is known.
The lower back panel is provided so as to extend vertically at the rear end of the rear side frame (see, for example, Patent Document 1).
JP 2007-8346 A

According to the vehicle body rear structure of Patent Document 1, the lower back panel is formed in a column shape by extending vertically at the rear end portion of the rear side frame.
By making the lower back panel a columnar member extending vertically, it is said that the lower back panel can receive a collision load regardless of the vehicle height of the colliding vehicle.

However, the lower back panel is a columnar member extended vertically.
Therefore, when an opponent vehicle with different vehicle height collides with the upper and lower end portions of the lower back panel, the upper and lower end portions can be bent relatively easily.
For this reason, the impact load applied to the upper and lower ends of the lower back panel cannot be transmitted to the rear side frame, and the impact load cannot be absorbed well.

  The present invention provides a vehicle body rear structure that can absorb an impact load satisfactorily when an opponent vehicle with a different vehicle height collides, and can prevent the opponent vehicle from entering the vehicle body rear structure side. Is an issue.

  In the invention according to claim 1, the left and right rear side frames are provided facing the vehicle body front-rear direction, a rear panel is bridged on the rear ends of the left and right rear side frames, and a rear wall of the trunk chamber is formed by the rear panel, In a vehicle body rear structure having a trunk lid locking portion for opening and closing the trunk chamber at the rear of the rear panel, the trunk lid is provided along an upper portion of the rear panel, and forms a lower opening of the trunk chamber and includes the locking portion. The left and right leg portions are suspended from the left and right end portions of the upper cross member, and the lower beam portion is suspended from the lower end portions of the left and right leg portions. And a lower cross member formed in a substantially U shape at the lower beam portion, the upper cross member and the lower cross member A substantially rectangular frame-like skeleton is formed, and the frame-like skeleton is provided on the rear panel, and a substantially central portion of the left and right leg portions of the frame-like skeleton is the left and right rear side frames. It is connected to the rear-end part via the said rear panel, respectively.

Here, in a normal vehicle, rear bumper beams are bridged between rear end portions of the left and right rear side frames.
When a partner vehicle with a different vehicle height collides from behind, the bumper beam of the partner vehicle may enter above or below the rear bumper beam.

Therefore, in claim 1, an upper cross member that forms the lower portion of the trunk chamber opening is provided along the upper portion of the rear panel, and the lower cross member is provided on the cross member.
The lower cross member was formed in a substantially U shape with the left and right leg portions and the lower beam portion, and a substantially rectangular frame-shaped skeleton was formed with the upper and lower cross members.

By forming a substantially rectangular frame skeleton with the upper and lower cross members, the rigidity of the left and right legs can be increased.
Then, the substantially central portions of the left and right leg portions were connected to the rear end portions of the left and right rear side frames via the rear panel.

Therefore, the upper ends of the left and right legs can be arranged above the left and right rear side frames (that is, the rear bumper beam).
Further, the lower ends of the left and right leg portions can be arranged below the left and right rear side frames (that is, the rear bumper beam).

  According to a second aspect of the present invention, there is provided a center leg portion that connects a vehicle width direction center portion of the upper cross member and a vehicle width direction center portion of the lower beam portion.

  According to a third aspect of the present invention, the lower cross member is formed in a substantially U-shaped cross section, and a closed cross section is formed by the lower cross member and the rear panel.

  According to a fourth aspect of the present invention, the left and right gussets are respectively provided so as to have an upward slope from the upper surfaces of the left and right rear side frames toward the rear panel.

  According to a fifth aspect of the present invention, a rear side frame cross member spanned between the left and right rear side frames is provided in front of the lower cross member, and spanned between a left end portion of the rear side frame cross member and a left end portion of the lower cross member. And a right pan frame that spans the right end of the rear side frame cross member and the right end of the lower cross member.

In the invention according to claim 1, the rigidity of the left and right leg portions is increased by forming a substantially rectangular frame-shaped skeleton with the upper cross member and the lower cross member.
The upper ends of the left and right leg portions are arranged above the left and right rear side frames (that is, the rear bumper beam).
Further, the lower ends of the left and right legs are disposed below the left and right rear side frames (that is, the rear bumper beam).

Thereby, when the other vehicle with high vehicle height collides from back, the bumper beam of the other vehicle can be applied to the upper ends of the left and right legs.
The left and right legs are members that constitute part of the frame-like skeleton. Therefore, since the left and right leg portions have high rigidity, the impact load applied to the upper end portions of the left and right leg portions can be efficiently transmitted to the left and right rear side frames and absorbed well.
Furthermore, the bumper beam of the opponent vehicle with a high vehicle height is applied to the upper ends of the left and right legs, so that the opponent vehicle is prevented from passing upward in the height direction, and the entry of the opponent vehicle into the rear body structure side is suppressed. be able to.

Further, when an opponent vehicle having a high vehicle height is shifted to the left and right sides and has an offset collision, the bumper beam of the opponent vehicle can be applied to one upper end of the left and right legs.
Since the left and right legs are highly rigid members, the impact load applied to one upper end can be transmitted to the other upper end via the upper cross member.
Thereby, the impact load which acted on one upper end part can be efficiently transmitted to the left and right rear side frames and absorbed well.
In addition, the bumper beam of the opponent vehicle with a high vehicle height is applied to the upper end of one of the left and right legs, preventing the opponent vehicle from passing in the vehicle width direction and preventing the opponent vehicle from entering the rear body structure side. Can be suppressed.

On the other hand, when an opponent vehicle with a low vehicle height collides from behind, the bumper beam of the opponent vehicle can be applied to the lower ends of the left and right legs.
The left and right legs are members that constitute part of the frame-like skeleton. Accordingly, since the left and right leg portions are highly rigid members, the impact load applied to the lower end portions of the left and right leg portions can be efficiently transmitted to the left and right rear side frames and absorbed well.
Furthermore, the bumper beam of the opponent vehicle with a low vehicle height is applied to the lower ends of the left and right legs to prevent the opponent vehicle from passing down in the height direction and prevent the opponent vehicle from entering the vehicle rear structure side. Can be suppressed.

In addition, when an opponent vehicle having a low vehicle height is shifted to the left and right and has an offset collision, the bumper beam of the opponent vehicle can be applied to one lower end of the left and right legs.
Since the left and right leg portions are highly rigid members, an impact load applied to one lower end portion can be transmitted to the other lower end portion via the upper cross member.
Thereby, the impact load which acted on one lower end part can be efficiently transmitted to the left and right rear side frames and absorbed well.
In addition, the bumper beam of the opponent vehicle with a low vehicle height is applied to the lower end of one of the left and right legs to prevent the opponent vehicle from passing in the vehicle width direction and prevent the opponent vehicle from entering the vehicle rear structure side. Can be suppressed.

In this way, according to the first aspect, when an opponent vehicle with different vehicle height collides from behind, the bumper beam of the opponent vehicle is applied to the upper and lower ends of the left and right legs, so that the left and right rear side frames There is an advantage that the impact load can be transmitted efficiently and absorbed well.
Furthermore, the bumper beam of the opponent vehicle is applied to the upper and lower ends of the left and right legs, so that the opponent vehicle can be prevented from passing in the height direction and the entry of the opponent vehicle into the rear structure side of the opponent vehicle can be suppressed. There are advantages.

In addition, when an opponent vehicle with different vehicle height has an offset collision from the rear, the impact load is applied to the left and right rear side frames by applying the bumper beam of the opponent vehicle to one upper end or one lower end of the left and right legs. There is an advantage that it can be transmitted efficiently and absorbed well.
In addition, the bumper beam of the opponent vehicle is applied to one of the upper and lower ends of the left and right legs to prevent the opponent vehicle from passing in the vehicle width direction and to prevent the opponent vehicle from entering the vehicle rear structure side. There is an advantage that you can.

In the invention which concerns on Claim 2, the vehicle cross direction direction center part of each of the upper cross member and the lower beam part was connected by the center leg part.
Therefore, the rigidity of the frame skeleton (that is, the rigidity of the left and right leg portions) can be further increased.
Accordingly, there is an advantage that the impact load can be efficiently transmitted to the left and right rear side frames and the impact load can be absorbed better.

In the invention according to claim 3, the lower cross member is formed in a substantially U-shaped cross section, and the closed cross section is formed by the lower cross member and the rear panel.
Therefore, the rigidity of the frame skeleton (that is, the rigidity of the left and right leg portions) can be further increased.
Accordingly, there is an advantage that the impact load can be efficiently transmitted to the left and right rear side frames and the impact load can be absorbed better.

In the invention according to claim 4, the left and right gussets are provided in an upward slope from the upper surfaces of the left and right rear side frames toward the rear panel. The rear panel is provided with a frame-like skeleton (left and right legs).
Therefore, the left and right gussets can be provided on the upper ends of the left and right legs via the rear panel, and the rigidity of the upper ends of the left and right legs can be further increased.
Accordingly, when a counterpart vehicle having a high vehicle height collides from the rear, there is an advantage that the impact load can be efficiently transmitted to the left and right rear side frames to absorb the impact load better.

  In the invention according to claim 5, the rear side frame cross member is bridged between the left and right rear side frames. Then, the left pan frame was bridged over the left end portion of the rear side frame cross member and the left end portion of the lower cross member, and the right pan frame was bridged over the right end portion of the rear side frame cross member and the right end portion of the lower cross member.

The left and right pan frames can be provided on the lower cross member, and the rigidity of the lower ends of the left and right legs can be further increased.
Accordingly, when a counterpart vehicle having a low vehicle height collides from the rear, there is an advantage that the impact load can be efficiently transmitted to the left and right rear side frames to absorb the impact load better.

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

FIG. 1 is a perspective view showing a vehicle body rear structure (first embodiment) according to the present invention.
The vehicle body rear structure 10 includes left and right rear side frames 11, 12 that face the vehicle front-rear direction, a rear side frame cross member 13 that spans the left and right rear side frames 11, 12, and a rear side of the rear side frame cross member 13. A rear floor pan 14 (see also FIG. 2) provided, a rear panel 15 spanned between rear end portions 11a and 12a (see also FIG. 2) of the left and right rear side frames 11 and 12, and a rear panel 15 A frame-shaped skeleton 16 and a rear bumper beam assembly 18 provided on the frame-shaped skeleton 16 are provided.

2 is an exploded perspective view showing the vehicle body rear structure according to the first embodiment, and FIG. 3 is a plan view showing the vehicle body rear structure according to the first embodiment.
The left and right rear side frames 11 and 12 are provided in parallel to each other at a predetermined interval in the vehicle front-rear direction.
Rear side frame cross members 13 are bridged in the vehicle width direction between the left and right rear side frames 11 and 12.

A rear floor pan 14 is provided behind the rear side frame cross member 13 and between the left and right rear side frames 11 and 12.
The rear floor pan 14 forms a bottom portion 22 of the trunk chamber 21 and is provided with a spare tire storage recess 23 for storing a spare tire (not shown).

The rear floor pan 14 includes a bottom portion 22 formed in a substantially rectangular shape, a front wall 25 raised upward from the front side of the bottom portion 22, a left side wall 26 raised upward from the left side of the bottom portion 22, And a right side wall 27 raised upward from the right side of the bottom 22.
The front wall 25 is joined to the rear side frame cross member 13 by welding. The left side wall 26 is joined to the left rear side frame 11 by welding, and the right side wall 27 is joined to the right rear side frame 12 by welding.
The rear end portion 28 of the rear floor pan 14 is joined to the rear panel 15 by welding.

A rear panel 15 is bridged between rear end portions 11a and 12a of the left and right rear side frames 11 and 12, respectively.
The rear panel 15 is a panel formed in a substantially rectangular shape, the left end 15a is joined to the rear end 11a of the left rear side frame 11 by welding, and the right end 15b is welded to the rear end 12a of the right rear side frame 12. It is joined.
A rear wall of the trunk chamber 21 is formed by the rear panel 15.
A frame-like skeleton 16 is provided on the rear panel 15.

FIG. 4 is a perspective view showing a frame-like skeleton according to the first embodiment.
The frame-like skeleton 16 is bridged over the upper cross member 31 provided along the upper portion 15 c of the rear panel 15, the lower cross member 32 provided in the upper cross member 31, the upper cross member 31 and the lower cross member 32. And a central leg 33.
The frame-like skeleton 16 is provided on the rear panel 15 and is formed in a substantially rectangular shape by an upper cross member 31 and a lower cross member 32.

  The upper cross member 31 is a beam member provided on the upper portion 15c of the rear panel 15 and extending substantially horizontally in the vehicle width direction.

  The lower cross member 32 includes a left leg 51 that is suspended from the left end 31 a of the upper cross member 31, a right leg 52 that is suspended from the right end 31 b of the upper cross member 31, and left and right legs 51, 52. A lower beam portion 53 is provided between the lower end portions 51a and 52a.

The left leg portion 51 is a column that connects the left end portion 31 a of the upper cross member 31 and the left end portion (left end portion of the upper cross member 31) 53 a of the lower beam portion 53.
The right leg portion 52 is a column that connects the right end portion 31 b of the upper cross member 31 and the right end portion (the right end portion of the upper cross member 31) 53 b of the lower beam portion 53.
The right leg portion 52 is disposed substantially parallel to the right side of the left leg portion 51 at a predetermined interval.

The lower beam portion 53 is a beam material that is disposed below the upper cross member 31 in a substantially parallel manner at a predetermined interval.
The lower cross member 32 is formed in a substantially U shape in the rear view by the left and right leg portions 51 and 52 and the lower beam portion 53.

  In the lower cross member 32, a substantially central portion 51 b in the vertical direction of the left leg 51 is connected to the rear end portion 11 a of the left rear side frame 11 via the rear panel 15, and a substantially central portion 52 b in the vertical direction of the right leg 52 is formed. The rear end portion 12 a of the right rear side frame 12 is connected via a rear panel 15.

The upper cross member 31 and the lower cross member 32 (the left and right leg portions 51 and 52 and the lower beam portion 53) are formed in a substantially rectangular shape to increase the rigidity of the left and right leg portions 51 and 52. Can do.
By increasing the rigidity of the left and right leg portions 51 and 52, when an impact load is applied to the upper end portions 51c and 52c of the left and right leg portions 51 and 52, the upper end portions 51c and 52c are bent (deformed). Can be prevented.
Therefore, the impact load acting on the upper end portions 51c and 52c can be efficiently transmitted to the left and right rear side frames 11 and 12.

The center leg portion 33 is a column that connects the vehicle width direction center portion 31 c of the upper cross member 31 and the vehicle width direction center portion 53 c of the lower beam portion 53.
By connecting the central portion 31c of the upper cross member 31 in the vehicle width direction and the central portion 53c of the lower beam portion 53 in the vehicle width direction by the central leg portion 33, the rigidity of the frame-like skeleton 16 (that is, the left and right leg portions 51, 52). ) Can be further enhanced.

5 is a sectional view taken along line 5-5 in FIG. 3, and FIG. 6 is a sectional view taken along line 6-6 in FIG.
The upper cross member 31 is a beam member in which an inner panel 35 and an outer panel 36 are provided along the upper portion 15 c of the rear panel 15.

The inner panel 35 is formed by an inner wall 37 and an upper wall 38 in a substantially L-shaped cross section, and a lower end portion 37a of the inner wall 37 is joined to the back surface of the upper portion 15c of the rear panel 15 by welding.
The outer panel 36 is formed by a lower wall 41 and a rear wall 42 in a substantially L-shaped cross section, and a lower end portion 41a of the lower wall 41 is joined to the surface of the upper portion 15c of the rear panel 15 by welding.
A rear end portion 38a of the upper wall 38 is joined to an upper end portion 42a of the rear wall 42 by welding.

In this manner, the lower end portion 37a of the inner wall 37 is provided on the back surface of the upper portion 15c of the rear panel 15, the lower end portion 41a of the lower wall 41 is provided on the surface of the upper portion 15c of the rear panel 15, and the rear end portion 38a of the upper wall 38 is provided. Is provided at the upper end portion 42a of the rear wall 42, so that the inner panel and the outer panel (that is, the upper cross member 31) are formed in a closed cross section.
By forming the upper cross member 31 in a closed cross section, the rigidity of the upper cross member 31 can be increased.

The upper cross member 31 forms a lower opening 44a in the opening 44 of the trunk chamber 21 (see also FIG. 1), and a striker (locking portion) 45 is provided in the upper center 31d.
The striker 45 is a member that is provided behind the rear panel 15 and that can lock a locking latch (not shown) of the trunk lid 46 (see FIG. 1).

By locking the locking latch to the striker 45, the trunk lid 46 is kept closed.
On the other hand, the trunk lid 46 is kept open by releasing the lock of the striker 45 by the locking latch.

By providing the striker 45 on the upper cross member 31 of the frame-like skeleton 16, the upper cross member 31 can also serve as a member for providing the striker 45.
Therefore, it is not necessary to prepare a member for providing the striker 45 individually.
As a result, the number of parts can be reduced, and the size can be reduced.

7 is a cross-sectional view taken along line 7-7 of FIG.
The left leg 51 is formed in a substantially U-shaped cross section at the rear surface 55 and the left and right side walls 56, 57, and the front sides 56a, 57a of the left and right side walls 56, 57 are joined to the rear panel 15 by welding.
Therefore, the left leg 51 and the rear panel 15 form a closed cross section.

The right leg 52 is formed in a substantially U-shaped cross section at the rear surface 61 and the left and right side walls 62, 63, and the front sides 62a, 63a of the left and right side walls 62, 63 are joined to the rear panel 15 by welding.
Therefore, the right leg portion 52 and the rear panel 15 form a closed cross section.

As shown in FIG. 6, the lower beam portion 53 is formed in a substantially U-shaped cross section with a rear surface 65 and upper and lower side walls 66 and 67, and front sides 66 a and 67 a of the upper and lower side walls 66 and 67 are welded to the rear panel 15. It is joined.
Therefore, a closed cross section is formed by the lower beam portion 53 and the rear panel 15.

The left and right leg portions 51 and 52 and the lower beam portion 53 are each formed in a substantially U-shaped cross section, so that the lower cross member 32 shown in FIG. 4 is formed in a substantially U-shaped cross section throughout.
The lower cross member 32 has a closed cross section formed by the left leg 51 and the rear panel 15, and a closed cross section formed by the right leg 52 and the rear panel 15. In addition, a closed cross section is formed by the lower beam portion 53 and the rear panel 15.

That is, the lower cross member 32 is joined to the rear panel 15 by welding, so that a closed cross section is formed by the lower cross member 32 and the rear panel 15.
In addition, the upper cross member 31 is also formed in a closed cross section.
Therefore, the rigidity of the frame-like skeleton 16 (that is, the rigidity of the left and right leg portions 51 and 52) can be further increased.

As shown in FIG. 4, the frame-shaped skeleton 16 has a center leg portion 33 spanning the upper cross member 31 and the lower beam portion 53.
The central leg 33 is formed in a substantially U-shaped cross section at the rear surface 71 and the left and right side walls 72, 73, and the front sides 72a, 73a of the left and right side walls 72, 73 are joined to the rear panel 15 by welding.
The central leg 33 and the rear panel 15 form a closed cross section.
By forming a closed cross section with the center leg portion 33 and the rear panel 15, the rigidity of the frame-like skeleton 16 (that is, the rigidity of the left and right leg portions 51 and 52) can be further increased.

Returning to FIG. 2, the rear bumper beam assembly 18 is provided on the frame-shaped skeleton 16.
The rear bumper beam assembly 18 includes a left shock absorber 75 provided on the rear surface 55 of the left leg 51, a right shock absorber 76 provided on the rear surface 61 of the right leg 52, and left and right shock absorbers 75, 76. And a rear bumper beam 77 laid over.

The left impact absorbing portion 75 is provided on the rear surface 55 of the left leg portion 51 and in the substantially vertical central portion 51b.
Therefore, the left impact absorbing portion 75 is opposed to the rear end portion 11a of the left rear side frame 11 with the rear panel 15 interposed.
The left impact absorbing portion 75 is a member that absorbs impact load at the time of collision.

The right impact absorbing portion 76 is provided in the substantially central portion 52 b in the vertical direction on the rear surface 61 of the right leg portion 52.
Therefore, the right impact absorbing portion 76 is opposed to the rear end portion 12a of the right rear side frame 12 with the rear panel 15 interposed.
The right impact absorbing portion 76 is a member that absorbs an impact load at the time of collision.
The rear bumper beam 77 is a member that is bridged between the left and right impact absorbing portions 75 and 76 and absorbs an impact load at the time of collision.

Next, an example in which the opponent vehicle collides with the rear body structure 10 will be described with reference to FIGS.
First, an example in which a counterpart vehicle 80 having a high vehicle height collides head-on with the upper part of the frame-like skeleton 16 will be described with reference to FIGS.

FIG. 8 is a diagram for explaining an example in which the opponent vehicle collides head-on with the upper part of the frame-like skeleton according to the first embodiment.
When an opponent vehicle 80 with a high vehicle height collides from behind, the front bumper beam 81 of the opponent vehicle 80 can be applied to the upper part of the frame-shaped skeleton 16.
Specifically, the front bumper beam 81 can be applied to the upper end 51c of the left leg 51 and the upper end 52c of the right leg 52, respectively.
The impact load F1 acts on the upper end portions 51c and 52c of the left and right leg portions 51 and 52.

Here, as described above, the frame-like skeleton 16 including the left and right leg portions 51 and 52 is formed in a rectangular shape and further in a closed cross section, and in addition, the central leg portion 33 is bridged. High rigidity.
Therefore, when the impact load F1 is applied to the upper ends 51c and 52c of the left and right legs 51 and 52, there is no possibility that the upper ends 51c and 52c are bent by the impact load F1.

FIGS. 9A and 9B are diagrams for explaining an example of absorbing an impact load that has acted on the upper portion of the frame-like skeleton of the first embodiment.
As shown in (a) and (b), by preventing the upper end portions 51c and 52c of the left and right leg portions 51 and 52 from being bent, the impact load F1 applied to the upper end portions 51c and 52c is reduced to the left and right leg portions. As shown by the arrow A, it is efficiently transmitted to the substantially central portions 51b and 52b in the vertical direction of 51 and 52.

The impact load F1 transmitted to the substantially vertical center 51b of the left leg 51 is efficiently transmitted to the rear end 11a of the left rear side frame 11 through the rear panel 15 as indicated by an arrow B.
Similarly, the impact load F1 transmitted to the right middle portion 52b of the right leg portion 52 is efficiently transmitted to the rear end portion 12a of the right rear side frame 12 through the rear panel 15 as indicated by an arrow B.
Thereby, the impact load F1 transmitted to the rear end portions 11a, 12a of the left and right rear side frames 11, 12 can be satisfactorily absorbed by the left and right rear side frames 11, 12.

  Further, the front bumper beam 81 of the opponent vehicle 80 having a high vehicle height is applied to the upper end portions 51c and 52c of the left and right leg portions 51 and 52, thereby preventing the opponent vehicle 80 from passing each other in the height direction. It is possible to suppress the vehicle 80 from entering the vehicle body rear structure 10 side.

8 and 9, the example in which the front bumper beam 81 of the opponent vehicle 80 is applied to the upper end portions 51c and 52c of the left and right legs 51 and 52 has been described, but the front bumper beam 81 is applied to the upper cross member 31. The same effect can be obtained also in the case of.
That is, the upper cross member 31 is formed in a closed cross section and has increased rigidity. Therefore, when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be efficiently transmitted to the upper ends 51c and 52c of the left and right legs 51 and 52.
Thereby, even when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be absorbed well.

Next, an example in which a counterpart vehicle 83 having a low vehicle height collides frontally with the lower part of the frame-like skeleton 16 will be described with reference to FIGS.
FIG. 10 is a diagram for explaining an example in which the opponent vehicle collides head-on with the lower part of the frame-like skeleton according to the first embodiment.
When an opponent vehicle 83 with a low vehicle height collides from behind, the front bumper beam 84 of the opponent vehicle 83 can be applied to the lower part of the frame-like skeleton 16.
Specifically, the front bumper beam 84 can be applied to the lower end 51a of the left leg 51 and the lower end 52a of the right leg 52, respectively.
The impact load F2 acts on the lower end portions 51a and 52a of the left and right leg portions 51 and 52.

Here, as described above, the frame-like skeleton 16 including the left and right leg portions 51 and 52 is formed in a rectangular shape and further in a closed cross section, and in addition, the central leg portion 33 is bridged. High rigidity.
Therefore, when the impact load F2 acts on the lower ends 51a and 52a of the left and right legs 51 and 52, there is no possibility that the lower ends 51a and 52a are bent by the impact load F2.

FIGS. 11A and 11B are diagrams illustrating an example in which an impact load acting on the lower part of the frame-like skeleton of the first embodiment is absorbed.
As shown in (a) and (b), by preventing the lower end portions 51a and 52a of the left and right leg portions 51 and 52 from being bent, the impact load F2 acting on the lower end portions 51a and 52a is reduced to the left and right leg portions. As shown by the arrow C, it is efficiently transmitted to the substantially central portions 51b and 52b in the vertical direction of 51 and 52.

The impact load F2 transmitted to the substantially vertical center portions 51b and 52b of the left leg 51 is efficiently transmitted to the rear end portion 11a of the left rear side frame 11 through the rear panel 15 as indicated by an arrow D.
Similarly, the impact load F2 transmitted to the right middle portion 52b of the right leg portion 52 is efficiently transmitted to the rear end portion 12a of the right rear side frame 12 through the rear panel 15 as indicated by an arrow D.
Thereby, the impact load F2 transmitted to the rear end portions 11a, 12a of the left and right rear side frames 11, 12 can be satisfactorily absorbed by the left and right rear side frames 11, 12.

  Furthermore, the front bumper beam 84 of the opponent vehicle 83 with a low vehicle height is applied to the lower end portions 51a and 52a of the left and right legs 51 and 52 to prevent the opponent vehicle 83 from passing down in the height direction. It is possible to prevent the opponent vehicle 83 from entering the vehicle body rear structure 10 side.

As illustrated in FIGS. 8 to 11, when the opponent vehicles 80 and 83 having different vehicle heights collide from the rear with the rear body structure 10, the front bumper beams 81 and 84 of the opponent vehicles 80 and 83 are moved to the left and right legs. It can be applied to the upper end portions 51c, 52c and the lower end portions 51a, 52a of the portions 51, 52.
Thereby, the impact loads F1, F2 can be efficiently transmitted to the left and right rear side frames 11, 12 and absorbed well.

  Further, the opponent bumpers 80 and 83 of the opponent vehicles 80 and 83 having different vehicle heights are applied to the upper ends 51c and 52c and the lower ends 51a and 52a of the left and right legs 51 and 52, so that the opponent vehicles 80 and 83 are It is possible to prevent the opponent vehicles 80 and 83 from entering the vehicle body rear structure 10 side by preventing passing in the height direction.

Next, an example in which the opponent vehicle 86 collides frontally with the rear bumper beam 77 will be described with reference to FIG.
FIGS. 12A and 12B are diagrams for explaining an example in which the opponent vehicle collides head-on with the bumper beam according to the first embodiment.
As shown in (a) and (b), when the opponent vehicle 86 collides with the front bumper beam 87 from the rear, the impact load F3 is transmitted to the left and right impact absorbing members 75 and 76.
The shock absorbing members 75 and 76 are deformed and a part of the shock load F3 is absorbed.

  Here, the shock absorbing members 75 and 76 of the rear bumper beam assembly 18 are opposed to the rear end portions 11a and 12a of the left and right rear side frames 11 and 12 with the rear panel 15 interposed therebetween.

Therefore, the remaining impact load is efficiently transmitted to the rear end portions 11a and 12a of the left and right rear side frames 11 and 12 through the left and right leg portions 51 and 52 of the frame-like skeleton 16 and the rear panel 15, as indicated by an arrow E.
Thereby, the impact load F3 transmitted to the rear end portions 11a, 12a of the left and right rear side frames 11, 12 can be satisfactorily absorbed by the left and right rear side frames 11, 12.

Next, an example in which an opponent vehicle 80 having a high vehicle height collides with the upper left portion of the frame-shaped skeleton 16 will be described with reference to FIG.
FIG. 13 is a diagram illustrating an example in which an opponent vehicle has an offset collision with the upper left portion of the frame-like skeleton according to the first embodiment.
When an opponent vehicle 80 having a high vehicle height is offset from the rear to the left and an offset collision occurs, the front bumper beam 81 of the opponent vehicle 80 can be applied to the upper left portion of the frame-like skeleton 16.
Specifically, the front bumper beam 81 can be applied to the upper end portion 51 c of the left leg portion 51.
The impact load F4 acts on the upper end 51c of the left leg 51.

Here, as described above, the frame-like skeleton 16 including the left and right leg portions 51 and 52 is formed in a rectangular shape and further in a closed cross section, and in addition, the central leg portion 33 is bridged. High rigidity.
Therefore, when the impact load F4 is applied to the upper end portion 51c of the left leg 51, there is no possibility that the upper end portion 51c is bent by the impact load F4.

By preventing the upper end 51c of the left leg 51 from being bent, a part of the impact load F4 applied to the upper end 51c is efficiently transmitted to the substantially central part 51b in the vertical direction of the left leg 51 as indicated by the arrow F. .
On the other hand, the remaining impact load is transmitted to the upper cross member 31 as indicated by an arrow G. The impact load transmitted to the upper cross member 31 is efficiently transmitted as indicated by an arrow H through the upper end portion 52c of the right leg portion 52 to the substantially central portion 52b in the vertical direction of the right leg portion 52.

The impact load transmitted to the substantially vertical central portion 51b of the left leg 51 is efficiently transmitted to the rear end portion 11a of the left rear side frame 11 through the rear panel 15 as indicated by an arrow I.
Similarly, the impact load transmitted to the right center portion 52b of the right leg portion 52 is efficiently transmitted to the rear end portion 12a of the right rear side frame 12 through the rear panel 15 as indicated by an arrow J.
Thereby, the impact load transmitted to the rear end portions 11a, 12a of the left and right rear side frames 11, 12 can be satisfactorily absorbed by the left and right rear side frames 11, 12.

  Further, the front bumper beam 81 of the opponent vehicle 80 having a high vehicle height is applied to the upper end portion 51c of the left leg portion 51 to prevent the opponent vehicle 80 from passing in the vehicle width direction. Intrusion into the 10 side can be suppressed.

  Note that FIG. 13 illustrates the case where the opponent vehicle 80 is offset from the rear to the left and has an offset collision. However, when the opponent vehicle 80 is offset to the right and has an offset collision, the left and right rear side frames 11, 12 can absorb well.

Although the example in which the front bumper beam 81 of the opponent vehicle 80 is applied to the upper end 51c of the left leg 51 has been described with reference to FIG. 13, the same effect can be obtained when the front bumper beam 81 is applied to the upper cross member 31. can get.
That is, the upper cross member 31 is formed in a closed cross section and has increased rigidity. Therefore, when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be efficiently transmitted to the upper end portion 51 c of the left leg portion 51.
Thereby, even when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be absorbed well.

Next, an example in which an opponent vehicle 83 having a low vehicle height has an offset collision with the lower left portion of the frame-like skeleton 16 will be described with reference to FIG.
FIG. 14 is a diagram for explaining an example in which the opponent vehicle has an offset collision with the lower left portion of the frame-like skeleton according to the first embodiment.
When an opponent vehicle 83 with a low vehicle height shifts from the rear to the left and makes an offset collision, the front bumper beam 84 of the opponent vehicle 83 can be applied to the lower left portion of the frame-like skeleton 16.
Specifically, the front bumper beam 84 can be applied to the lower end portion 51 a of the left leg portion 51.
The impact load F5 acts on the lower end 51a of the left leg 51.

Here, as described above, the frame-like skeleton 16 including the left and right leg portions 51 and 52 is formed in a rectangular shape and further in a closed cross section, and in addition, the central leg portion 33 is bridged. High rigidity.
Therefore, when the impact load F5 acts on the lower end 51a of the left leg 51, there is no possibility that the lower end 51a is bent by the impact load F5.

By preventing the lower end 51a of the left leg 51 from being bent, a part of the impact load F5 applied to the lower end 51a can be efficiently transmitted to the substantially central part 51b in the vertical direction of the left leg 51 as indicated by an arrow K. .
On the other hand, the remaining impact load is transmitted to the lower beam portion 53 as indicated by an arrow L. The impact load transmitted to the lower beam portion 53 is efficiently transmitted as indicated by an arrow M through the lower end portion 52a of the right leg portion 52 to the substantially central portion 52b in the vertical direction of the right leg portion 52.

The impact load transmitted to the substantially vertical center 51b of the left leg 51 is efficiently transmitted to the rear end 11a of the left rear side frame 11 through the rear panel 15 as indicated by an arrow N.
Similarly, the impact load transmitted to the right middle portion 52b of the right leg portion 52 is efficiently transmitted to the rear end portion 12a of the right rear side frame 12 through the rear panel 15 as indicated by an arrow O.
Thereby, the impact load transmitted to the rear end portions 11a, 12a of the left and right rear side frames 11, 12 can be satisfactorily absorbed by the left and right rear side frames 11, 12.

  Further, the front bumper beam 84 of the opponent vehicle 83 with a low vehicle height is applied to the lower end portion 51a of the left leg portion 51 to prevent the opponent vehicle 83 from passing in the vehicle width direction. Intrusion into the 10 side can be suppressed.

  In FIG. 14, the case where the opponent vehicle 83 is offset from the rear to the left side has been described as an offset collision. However, when the opponent vehicle 83 is offset to the right side and the offset collision is performed, the left and right rear side frames 11, 12 can absorb well.

As illustrated in FIGS. 13 to 14, when the opponent vehicles 80 and 83 having different vehicle heights collide with the rear body structure 10 from the rear, the front bumper beams 81 and 84 of the opponent vehicles 80 and 83 are moved to the left and right legs. It can be applied to one upper end part 51c, 52c of the part 51, 52 or one lower end part 51a, 52a.
Thereby, the impact loads F4 and F5 can be efficiently transmitted to the left and right rear side frames 11 and 12, and can be absorbed well.

  Further, the front bumper beams 81 and 84 of the opponent vehicles 80 and 83 having different vehicle heights are applied to the upper ends 51c and 52c of the left and right legs 51 and 52 and the lower ends 51a and 52a of the opponent vehicle. It is possible to prevent 80 and 83 from passing each other in the vehicle width direction, and to prevent the counterpart vehicles 80 and 83 from entering the vehicle body rear structure 10 side.

  Next, a vehicle body rear structure 90 according to the second embodiment will be described with reference to FIGS. In addition, in 2nd Embodiment, the same code | symbol is attached | subjected about the same similar member as the vehicle body rear part structure 10 of 1st Embodiment, and description is abbreviate | omitted.

FIG. 15 is an exploded perspective view showing a vehicle body rear part structure (second embodiment) according to the present invention.
The vehicle body rear structure 90 of the second embodiment is provided with left and right gussets 91 and 92 at the rear end portions 11a and 12a of the left and right rear side frames 11 and 12, respectively, and the rear side frame cross member 13 and the lower cross member 32 (see FIG. 2), the left and right pan frames 94 and 95 are bridged over each other, and the other configurations are the same as those of the vehicle body rear structure 10 of the first embodiment.

FIG. 16 is a side view showing the left gusset of the vehicle body rear structure according to the second embodiment.
The left gusset 91 is provided so as to rise upward from the upper wall (upper surface) 11b of the rear end portion 11a of the left rear side frame 11 toward the rear panel 15 (frame-like skeleton 16 (see FIG. 2)).
Specifically, the left gusset 91 includes an inclined wall 97 formed in an upward gradient from the upper surface 11b of the rear end portion 11a toward the rear panel 15, and a left side wall 98 bent downward from the left side of the inclined wall 97. And a right side wall 99 that is bent downward from the right side of the inclined wall 97.
The left gusset 91 is formed of an inclined wall 97 and left and right side walls 98 and 99 in a substantially U-shaped cross section.

A front joining piece 97 a is provided at the front end of the inclined wall 97. The front joining piece 97a is joined to the upper wall 11b of the rear end portion 11a of the left rear side frame 11 by welding.
Rear joint pieces 98a and 99a are provided at the rear end portion 97b of the inclined wall 97 and the rear end portions of the left and right side walls 98 and 99, respectively.
The rear joining pieces 97b, 98a, 99a are joined to the rear surface of the rear panel 15 by welding.

A left joint piece 98 b is provided at the lower end of the left side wall 98. The left joining piece 98b is joined to the left side wall 11c of the rear end portion 11a of the left rear side frame 11 by welding.
A right joining piece 99 b is provided at the lower end of the right wall 99. The right joining piece 99b is joined by welding to the right side wall 11d (see also FIG. 18) of the rear end portion 11a of the left rear side frame 11.

FIG. 17 is a side view showing the vehicle body rear structure according to the second embodiment, and FIG. 18 is a plan view showing the vehicle body rear structure according to the second embodiment.
FIG. 18 shows a state in which the rear floor pan 14 is removed in order to facilitate understanding of the configuration of the left and right pan frames 94 and 95.

The rear end 91a of the left gusset 91 is opposed to the upper end 51c of the left leg 51 with the rear panel 15 interposed.
That is, the rear end portion 91 a of the left gusset 91 is provided on the upper end portion 51 c of the left leg portion 51 via the rear panel 15.

Therefore, the upper end 51c of the left leg 51 can be reinforced with the left gusset 91 to further increase the rigidity of the upper end 51c of the left leg 51.
Thereby, when an impact load is applied to the upper end portion 51c of the left leg portion 51, the upper end portion 51c can be further prevented from being bent (deformed).

In addition, since the right gusset 92 is a member symmetrical to the left gusset 91, the same reference numerals as those of the left gusset 91 are given to the respective components, and description thereof is omitted.
By providing the right gusset 92 on the upper wall (upper surface) 12b of the rear end portion 12a of the right rear side frame 12 and the rear surface of the rear panel 15, the upper end portion 52c of the right leg portion 52 is reinforced by the right gusset 92, and the right leg portion The rigidity of the upper end part 52c of 52 can further be improved.
Thereby, when an impact load acts on the upper end part 52c of the right leg part 52, it can suppress more favorably that the upper end part 52c bends (deforms).

  In this way, the left and right rear side frames 11 and the left and right pan frames 94, and the left and right rear side frames 11 and left and right pan frames 94, by suppressing the bending (deformation) of the upper end portions 51c and 52c of the left leg portions 51 and 52 with the left and right gussets 91 and 92, 95 can efficiently transfer the impact load.

  Returning to FIG. 15, the left pan frame 94 is provided on the left side of the spare tire storage recess 23 in the bottom portion 22 of the rear floor pan, and the left end portion 13 a of the rear side frame cross member 13 and the left end portion 15 a ( It is stretched over the left end portion of the lower cross member 32 shown in FIG.

The left pan frame 94 is formed in a substantially rectangular shape in cross section, and a front joining piece 101 is provided at a front end portion, and a rear joining piece 102 is provided at a rear end portion.
The front joining piece 101 is joined to the rear wall 13b of the left end portion 13a of the rear side frame cross member 13 by welding.
The rear joining piece 102 is joined to the left end portion 15a of the rear surface of the rear panel 15 by welding.

As shown in FIGS. 17 and 18, the rear end portion 94a of the left pan frame 94 is opposed to the left end portion 53a (see also FIG. 4) of the lower beam portion 53 with the rear panel 15 interposed.
That is, the rear end portion 94 a of the left pan frame 94 is provided on the left end portion 53 a of the lower beam portion 53 via the rear panel 15.

And the left end part 53a of the lower beam part 53 is connected to the lower end part 51a (refer also FIG. 4) of the left leg part 51. FIG.
Therefore, the lower end 51a of the left leg 51 can be reinforced by the left pan frame 94, and the rigidity of the lower end 51a of the left leg 51 can be further increased.
Thereby, when an impact load is applied to the lower end portion 51a of the left leg portion 51, the lower end portion 51a can be further suppressed from being bent (deformed).

Note that the right pan frame 95 is a member symmetrical to the left pan frame 94, and therefore, the same reference numerals as those of the left pan frame 94 are given to the respective components, and description thereof is omitted.
The right pan frame 95 is bridged between the right end portion 13c of the rear side frame cross member 13 and the rear panel 15 (the right end portion 53b of the lower beam portion 53), whereby the lower end portion 52a (see FIG. 4) of the right leg portion 52 is connected to the right pan frame. The rigidity of the lower end portion 52a of the right leg portion 52 can be further enhanced.
Thereby, when an impact load is applied to the lower end portion 52a of the right leg portion 52, the lower end portion 52a can be further prevented from being bent (deformed).

  In this way, the left and right pan frames 94 and 95 and the left and right rear sides are suppressed by favorably suppressing the bending (deformation) of the lower end portions 51a and 52a of the left and right leg portions 51 and 52 by the left and right pan frames 94 and 95. The impact load can be efficiently transmitted to the frame to absorb the impact load better.

Next, an example in which the opponent vehicle collides with the rear body structure 90 will be described with reference to FIGS.
First, an example in which a counterpart vehicle 80 having a high vehicle height collides head-on with the upper part of the frame-like skeleton 16 will be described with reference to FIG.

FIGS. 19A and 19B are diagrams illustrating an example of a frontal collision with the upper part of the frame-like skeleton of the second embodiment.
In (a), the front bumper beam 81 of the opponent vehicle 80 having a high vehicle height is applied to the upper part of the frame-shaped skeleton 16.
Therefore, the impact load F1 acts on the upper end portions 51c and 52c of the left and right leg portions 51 and 52.
The left and right gussets 91 and 92 better suppress the bending (deformation) of the upper end portions 51c and 52c of the left leg portions 51 and 52, so that the impact load F1 acting on the upper end portions 51c and 52c can be efficiently transmitted. .

In (b), a part of the impact load F1 applied to the upper end portion 51c of the left leg portion 51 passes through the left gusset 91 from the substantially vertical center portion 51b of the left leg portion 51 as shown by the arrow P in the left rear side frame 11. It is efficiently transmitted to the rear end portion 11a.
A part of the impact load F1 transmitted to the rear end portion 11a is transmitted to the left rear side frame 11 and absorbed well.

The remaining impact load is distributed at the substantially vertical central portion 51b of the left leg portion 51 and efficiently transmitted to the rear end portion 94a of the left pan frame 94 as indicated by the arrow Q through the left end portion 53a of the lower beam portion 53.
The impact load transmitted to the rear end portion 94a is transmitted to the left pan frame 94 and absorbed well.

The impact load F1 that has acted on the upper end 52c of the right leg 52 can be absorbed in the same manner as the impact load F1 that has acted on the left leg 51.
That is, a part of the impact load F1 transmitted from the substantially vertical central portion 52b of the right leg portion 52 to the rear end portion 12a of the right rear side frame 12 is well absorbed by the right rear side frame 12.
Further, the impact load distributed at the substantially central portion 52 b in the vertical direction is well absorbed by the right pan frame 95.

  Further, the front bumper beam 81 of the opponent vehicle 80 having a high vehicle height is applied to the upper end portions 51c and 52c of the left and right leg portions 51 and 52, thereby preventing the opponent vehicle 80 from passing each other in the height direction. It is possible to suppress the vehicle 80 from entering the vehicle body rear structure 10 side.

In FIG. 19, the example in which the front bumper beam 81 of the opponent vehicle 80 is applied to the upper end portions 51 c and 52 c of the left and right legs 51 and 52 has been described, but when the front bumper beam 81 is applied to the upper cross member 31. The same effect can be obtained.
That is, the upper cross member 31 is formed in a closed cross section and has increased rigidity. Therefore, when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be efficiently transmitted to the upper ends 51c and 52c of the left and right legs 51 and 52.
Thereby, even when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be absorbed well.

Next, an example in which a counterpart vehicle 83 having a low vehicle height collides frontally with the lower portion of the frame-like skeleton 16 will be described with reference to FIG.
FIGS. 20A and 20B are diagrams illustrating an example of a frontal collision with the lower part of the frame-like skeleton of the second embodiment.
In (a), the front bumper beam 84 of the opponent vehicle 83 having a low vehicle height is applied to the lower part of the frame-like skeleton 16.
Thereby, the impact load F2 acts on the lower end portions 51a and 52a of the left and right leg portions 51 and 52.
The left and right pan frames 94 and 95 favorably prevent the lower ends 51a and 52a of the left and right legs 51 and 52 from being bent (deformed), whereby the impact load F2 applied to the lower ends 51a and 52a is efficiently transmitted. It is done.

In (b), a part of the impact load F2 applied to the lower end portion 51a of the left leg portion 51 is efficiently applied to the rear end portion 94a of the left pan frame 94 through the left end portion 53a of the lower beam portion 53 as shown by the arrow R. Reportedly.
A part of the impact load F1 transmitted to the left pan frame 94 is satisfactorily absorbed by the left pan frame 94.

The remaining impact load is distributed at the lower end portion 51 a of the left leg portion 51 and transmitted to the substantially vertical central portion 51 b of the left leg portion 51.
The impact load transmitted to the substantially vertical central portion 51b is efficiently transmitted to the rear end portion 11a of the left rear side frame 11 as indicated by an arrow S.
Further, the impact load transmitted to the rear end portion 11 a is satisfactorily absorbed by the left rear side frame 11.

The impact load F2 that has acted on the lower end 52a of the right leg 52 can be absorbed in the same manner as the impact load F2 that has acted on the left leg 51.
That is, a part of the impact load F <b> 2 that has acted on the lower end portion 52 a of the right leg portion 52 is well absorbed by the right pan frame 95.
Further, the impact load distributed at the lower end 52 a is absorbed well by the right rear side frame 12.

  Furthermore, the front bumper beam 84 of the opponent vehicle 83 with a low vehicle height is applied to the lower end portions 51a and 52a of the left and right legs 51 and 52 to prevent the opponent vehicle 83 from passing down in the height direction. It is possible to prevent the opponent vehicle 83 from entering the vehicle body rear structure 10 side.

As shown in FIGS. 19 to 20, when the opponent vehicles 80 and 83 having different vehicle heights collide head-on from the rear with the rear body structure 90, the front bumper beams 81 and 84 of the opponent vehicles 80 and 83 are moved to the left and right legs. It can be applied to the upper end portions 51c, 52c and the lower end portions 51a, 52a of the portions 51, 52.
Thereby, the impact loads F1 and F2 can be efficiently transmitted to the left and right rear side frames 11 and 12 and the left and right pan frames 94 and 95 and absorbed well.

  Further, the opponent bumpers 80 and 83 of the opponent vehicles 80 and 83 having different vehicle heights are applied to the upper ends 51c and 52c and the lower ends 51a and 52a of the left and right legs 51 and 52, so that the opponent vehicles 80 and 83 are It is possible to prevent the opponent vehicles 80 and 83 from entering the vehicle body rear structure 10 side by preventing passing in the height direction.

Next, an example in which an opponent vehicle 80 having a high vehicle height has an offset collision with the upper left portion of the frame-like skeleton 16 will be described with reference to FIG.
FIGS. 21A and 21B are diagrams for explaining an example of an offset collision with the upper left portion of the frame-like skeleton of the second embodiment.
In (a), the front bumper beam 81 of the opponent vehicle 80 having a high vehicle height is applied to the upper left part of the frame-like skeleton 16.
Thereby, the impact load F4 acts on the upper end portion 51c of the left leg portion 51.
By suppressing the upper end 51c of the left leg 51 from being bent (deformed) with the left gusset 91, the impact load F4 applied to the upper end 51c can be efficiently transmitted.

That is, a part of the impact load F4 applied to the upper end portion 51c of the left leg portion 51 is efficiently transmitted as shown by the arrow F to the substantially central portion 51b in the vertical direction of the left leg portion 51.
On the other hand, the remaining impact load is transmitted to the upper cross member 31 as indicated by an arrow G. The impact load transmitted to the upper cross member 31 is efficiently transmitted as indicated by an arrow H through the upper end portion 52c of the right leg portion 52 to the substantially central portion 52b in the vertical direction of the right leg portion 52.

In (b), the impact load F4 transmitted to the substantially vertical central portion 51b of the left leg portion 51 is distributed to the left rear side frame 11 and the left pan frame 94.
One of the dispersed impact loads is transmitted to the left rear side frame 11 as indicated by an arrow T, and the other is transmitted to the left pan frame 94 as indicated by an arrow U.
The transmitted impact load is well absorbed by the left rear side frame 11 and the left pan frame 94.

On the other hand, the remaining impact load transmitted to the substantially vertical center portion 52 b of the right leg portion 52 is distributed to the right rear side frame 12 and the right pan frame 95.
One of the dispersed impact loads is transmitted to the right rear side frame 12 as indicated by an arrow T, and the other is transmitted to the right pan frame 95 as indicated by an arrow U.
Each impact load transmitted is absorbed well by the right rear side frame 12 and the right pan frame 95.

  Further, the front bumper beam 81 of the opponent vehicle 80 having a high vehicle height is applied to the upper end portion 51c of the left leg portion 51 to prevent the opponent vehicle 80 from passing in the vehicle width direction. Intrusion into the 10 side can be suppressed.

  In FIG. 21, the case where the opponent vehicle 80 is offset from the rear to the left side has been described as being offset, but when the opponent vehicle 80 is offset to the right side and is offset, the left and right rear side frames 11, 12 and left and right pan frames 94 and 95 can absorb well.

Further, in FIG. 21, the example in which the front bumper beam 81 of the opponent vehicle 80 is applied to the upper end portion 51 c of the left leg portion 51 has been described, but the same effect can be obtained when the front bumper beam 81 is applied to the upper cross member 31. can get.
That is, the upper cross member 31 is formed in a closed cross section and has increased rigidity. Therefore, when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be efficiently transmitted to the upper end portion 51 c of the left leg portion 51.
Thereby, even when the front bumper beam 81 is applied to the upper cross member 31, the impact load can be absorbed well.

Next, an example in which an opponent vehicle 83 having a low vehicle height collides with the lower left portion of the frame-like skeleton 16 by an offset collision will be described with reference to FIG.
FIGS. 22A and 22B are diagrams for explaining an example of absorbing an impact load applied to the lower left portion of the frame-like skeleton of the second embodiment.
In (a), the front bumper beam 84 of the opponent vehicle 83 having a low vehicle height is applied to the lower left portion of the frame-like skeleton 16.
Thereby, the impact load F <b> 5 acts on the lower end portion 51 a of the left leg portion 51.
By preventing the lower end 51a of the left leg 51 from being bent, the impact load F5 applied to the lower end 51a can be transmitted efficiently.

That is, a part of the impact load F5 applied to the lower end 51a of the left leg 51 is efficiently transmitted to the left leg 51 as indicated by the arrow K.
On the other hand, the remaining impact load is transmitted to the lower beam portion 53 as indicated by an arrow L. The impact load transmitted to the lower beam portion 53 is efficiently transmitted as indicated by an arrow M through the lower end portion 52a of the right leg portion 52 to the substantially central portion 52b in the vertical direction of the right leg portion 52.

In (b), the impact load transmitted to the left leg 51 is distributed to the left pan frame 94 and the left rear side frame 11.
One of the dispersed impact loads is transmitted to the left pan frame 94 as indicated by an arrow V, and the other is transmitted to the left rear side frame 11 as indicated by an arrow W.
The transmitted impact load is well absorbed by the left pan frame 94 and the left rear side frame 11.

On the other hand, the impact load distributed to the right leg 52 is distributed to the right pan frame 95 and the right rear side frame 12.
One of the dispersed impact loads is transmitted to the right pan frame 95 as indicated by an arrow V, and the other is transmitted to the right rear side frame 12 as indicated by an arrow W.
Each impact load transmitted is absorbed well by the right pan frame 95 and the right rear side frame 12.

  Further, the front bumper beam 84 of the opponent vehicle 83 with a low vehicle height is applied to the lower end portion 51a of the left leg portion 51 to prevent the opponent vehicle 83 from passing in the vehicle width direction. Intrusion into the 10 side can be suppressed.

  In FIG. 22, the case where the opponent vehicle 83 is offset from the rear to the left side has been described as an offset collision. However, when the opponent vehicle 83 is offset to the right side and the offset collision occurs, the left and right pan frames 94, 95 and left and right rear side frames 11 and 12 can absorb well.

As described with reference to FIGS. 21 to 22, when the counterpart vehicles 80 and 83 having different vehicle heights collide with the rear body structure 90 from behind, the front bumper beams 81 and 84 of the counterpart vehicles 80 and 83 are moved to the left and right legs. It can be applied to one upper end part 51c, 52c of the part 51, 52 or one lower end part 51a, 52a.
Thereby, the impact loads F4 and F5 can be efficiently transmitted to the left and right rear side frames 11 and 12 and the left and right pan frames 94 and 95 and absorbed well.

  Further, the front bumper beams 81 and 84 of the opponent vehicles 80 and 83 having different vehicle heights are applied to the upper ends 51c and 52c of the left and right legs 51 and 52 and the lower ends 51a and 52a of the opponent vehicle. It is possible to prevent the vehicles 80 and 83 from passing each other in the vehicle width direction and to prevent the counterpart vehicles 80 and 83 from entering the vehicle body rear structure 10 side.

  In the first and second embodiments, the striker 45 is exemplified as the locking part. However, the present invention is not limited to this, and a locking latch (not shown) for locking to the striker 45 is used as the locking part. Is also possible.

  Further, the left and right rear side frames 11 and 12, the rear side frame cross member 13, the rear panel 15, the frame-like frame 16, the upper cross member 31, the lower cross member 32, the central leg portion shown in the first and second embodiments. 33, the left and right leg portions 51 and 52, the lower beam portion 53, the left and right gussets 91 and 92, the left and right pan frames 94 and 95 are not limited to the illustrated shapes, and can be appropriately changed.

  The present invention is suitable for application to an automobile having a vehicle body rear structure in which a rear panel is bridged between rear end portions of left and right rear side frames.

It is a perspective view which shows the vehicle body rear part structure (1st Embodiment) which concerns on this invention. It is a disassembled perspective view which shows the vehicle body rear part structure which concerns on 1st Embodiment. It is a top view which shows the vehicle body rear part structure which concerns on 1st Embodiment. It is a perspective view which shows the frame-shaped frame | skeleton which concerns on 1st Embodiment. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 5. It is a figure explaining the example which the other party vehicle collided with the upper part of the frame-shaped frame | skeleton which concerns on 1st Embodiment. It is a figure explaining the example which absorbs the impact load which acted on the upper part of the frame shape frame of a 1st embodiment. It is a figure explaining the example which the other party vehicle collided with the lower part of the frame-shaped frame | skeleton which concerns on 1st Embodiment. It is a figure explaining the example which absorbs the impact load which acted on the lower part of the frame-shaped frame | skeleton of 1st Embodiment. It is a figure explaining the example which the other party vehicle collided with the bumper beam which concerns on 1st Embodiment. It is a figure explaining the example which the other party vehicle collided with the left upper part of the frame-shaped frame concerning a 1st embodiment. It is a figure explaining the example which the other party vehicle carried out an offset collision to the lower left part of the frame shape frame concerning a 1st embodiment. It is a disassembled perspective view which shows the vehicle body rear part structure (2nd Embodiment) which concerns on this invention. It is a side view which shows the left gusset of the vehicle body rear part structure which concerns on 2nd Embodiment. It is a side view which shows the vehicle body rear part structure which concerns on 2nd Embodiment. It is a top view which shows the vehicle body rear part structure which concerns on 2nd Embodiment. It is a figure explaining the example which carried out the front collision to the upper part of the frame-shaped frame | skeleton of 2nd Embodiment. It is a figure explaining the example which collided front with the lower part of the frame-shaped frame | skeleton of 2nd Embodiment. It is a figure explaining the example which carried out the offset collision to the upper left part of the frame shape frame | frame of 2nd Embodiment. It is a figure explaining the example which absorbs the impact load which acted on the lower left part of the frame shape frame | frame of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,90 ... Car body rear part structure, 11 ... Left rear side frame, 11a ... Rear end part of left rear side frame, 11b ... Upper surface of left rear side frame, 12 ... Right rear side frame, 12a ... Rear end part of right rear side frame, 12b ... Upper surface of right rear side frame, 13 ... Rear side frame cross member, 13a ... Left end portion of rear side frame cross member, 13c ... Right end portion of rear side frame cross member, 15 ... Rear panel, 15a ... Left end portion of rear panel, 15b ... Right end portion of rear panel 15c ... Upper part of rear panel, 16 ... Frame-like skeleton, 21 ... Trunk chamber, 31 ... Upper cross member, 31a ... Left end of upper cross member, 31b ... Right end of upper cross member, 31c ... Vehicle width of upper cross member Center of direction, 32 ... Lower cross member, 3 ... center leg, 44a ... lower opening of trunk chamber, 45 ... striker (locking part), 46 ... trunk lid, 51 ... left leg, 51a ... lower end of left leg, 51b ... upper and lower of left leg Approximate center part of direction, 52 ... Right leg part, 52a ... Lower end part of right leg part, 52b ... Substantially central part of right leg part, 53 ... Lower beam part, 53a ... Left end part of lower beam part (upper cross member) Left end portion), 53b ... right end portion of the lower beam portion (right end portion of the upper cross member), 53c ... center portion in the vehicle width direction of the lower beam portion, 91 ... left gusset, 92 ... right gusset, 94 ... left pan frame, 95 ... Right pan frame.

Claims (5)

A trunk lid that is provided with left and right rear side frames facing the vehicle body front-rear direction, a rear panel is bridged between rear ends of the left and right rear side frames, a rear wall of the trunk chamber is formed by the rear panel, and opens and closes the trunk chamber In the rear structure of the vehicle body provided with a locking part at the rear of the rear panel,
An upper cross member provided along the upper portion of the rear panel, forming a lower opening of the trunk chamber and having the locking portion;
The left and right legs are suspended from the left and right ends of the upper cross member, and the lower beam is bridged to the lower ends of the left and right legs, so that the left and right legs and the lower beam are substantially omitted. A lower cross member formed in a U-shape;
With
A substantially rectangular frame-shaped skeleton is formed by the upper cross member and the lower cross member, and the frame-shaped skeleton is provided on the rear panel,
The rear structure of the vehicle body, characterized in that, in the frame-like skeleton, substantially vertical center portions of the left and right leg portions are respectively connected to rear end portions of the left and right rear side frames via the rear panel.   The vehicle body rear portion structure according to claim 1, further comprising a center leg portion that connects a vehicle width direction center portion of the upper cross member and a vehicle width direction center portion of the lower beam portion. The lower cross member is formed in a substantially U-shaped cross section,
The vehicle body rear part structure according to claim 1, wherein a closed cross section is formed by the lower cross member and the rear panel.   The vehicle body rear structure according to any one of claims 1 to 3, wherein left and right gussets are respectively provided so as to be inclined upward from the upper surfaces of the left and right rear side frames toward the rear panel. In front of the lower cross member, the rear side frame cross member spanned between the left and right rear side frames,
A left pan frame spanned between the left end of the rear side frame cross member and the left end of the lower cross member;
The vehicle body rear part structure according to any one of claims 1 to 4, further comprising a right pan frame that spans between a right end portion of the rear side frame cross member and a right end portion of the lower cross member.

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