JP4754120B2 - Rear body structure of the vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rear vehicle body structure in which a rear frame is divided into upper and lower parts and both sides of a rear floor are sandwiched therebetween.
[0002]
[Prior art]
Generally, as a rear vehicle body structure of this type, as shown in a longitudinal sectional view of FIG. 20, a rear frame 1 extending along the vehicle longitudinal direction is provided on both sides in the vehicle width direction. The rear frame 1 is formed in a U-shape with an opening at the top, and both side portions 3a of the rear floor 3 are joined to the upper side of the rear frame 1 to form a closed cross section inside. The rear floor 3 is formed with a tire recess 3b for storing a spare tire. The tire recess 3b is formed by deep drawing to a relatively large depth D equal to or greater than the width of the spare tire.
[0003]
[Problems to be solved by the invention]
By the way, when the tire recess 3b is deep-drawn in the rear floor 3, the tire recess 3b is returned to the joint with the rear frame 1 so as not to cause cracks in the corner portions 3c and 3D of the tire recess 3b. There is a need to. Therefore, the upper end corner portions 3c and 3d must be formed with a large curvature, and a large dead space is formed in the vertical and horizontal directions of the tire recess 3b.
[0004]
Further, when a dead space is formed in the tire recess 3b, it is necessary to bend the rear frame 1 to the outside in the vehicle width direction accordingly. For this reason, it is difficult to ensure the performance at the time of rear face collision when the rear face is bent at an early stage with the corner portion of the curved portion as a fulcrum.
[0005]
Further, in order to prevent the frame cross-sectional deformation and improve the drag in the closed cross-section of the rear frame 1, there are many cases where the reinforcement 4 is disposed. Not only does the number of parts increase, the manufacturing process becomes complicated, but it also contributes to an increase in weight.
[0006]
When the depth D of the tire recess 3b is large, as shown in FIG. 20, the tire recess 3b is bent in an S shape from both side portions 3a joined to the upper surface of the rear frame 1 to the bottom surface of the tire recess 3b. Thus, the rear floor 3 hardly functions as a shearing surface when a load in the left-right direction is applied to the rear frame due to a collision from the rear of the vehicle body (hereinafter referred to as “rear collision”). That is, since the load in the left-right direction (in-plane load) transmitted from the rear frame 1 to the rear floor 3 and the plate direction of the rear floor 3 are greatly deviated, the in-plane load of the rear floor 3 transmitted from the rear frame 1 is rationalized. Cannot be dispersed. As a result, Euler buckling occurs in the rear frame 1, and it becomes difficult for the rear frame 1 to stably absorb in the axial direction and to sufficiently absorb impact energy.
[0007]
FIG. 21 shows a deformed state of the rear frame 1 and the rear floor 3 at the time of rear collision. When the rear impact is started from the non-rear impact state shown in FIG. 10A, the rear frame 1 is initially crushed, but as the deformation progresses, the rear frame 1 Each part of the curved portion is bent at a fulcrum, and then Euler buckling occurs in the rear frame 1 around the bent portion as shown in FIG. That is, since the impact load is not transmitted to the front of the vehicle body with respect to the impact load from the rear, there is a problem that the rear frame 1 is not stably crushed and the impact energy absorbability of the rear frame 1 is deteriorated.
[0008]
On the other hand, as disclosed in, for example, Japanese Patent Application Laid-Open No. 11-171048, when the rear floor is formed flat and the spare tire is suspended and supported on the lower surface of the rear floor, the rear floor functions as a shearing surface. Since the frames are firmly connected to each other by the rear floor, a load at the time of a rear impact flows along the shear surface of the rear floor and flows forward of the vehicle body, so that stable crushability can be obtained.
[0009]
However, in this prior art, since the both sides of the rear floor are joined at the upper side of the rear frame, the distance between the joint of the rear floor and the rear frame and the lower part of the rear frame becomes long, and therefore the lower part of the rear frame. When a load in the vehicle width direction is applied to the rear frame, the rear frame is likely to swing in the vehicle width direction with the joint with the rear floor as a fulcrum, so the rear frame is subject to external forces from parts suspended under the floor, such as a suspension. It is weak and requires a separate reinforcing structure, which not only complicates the structure but also increases the weight of the vehicle body.
[0010]
In view of the above circumstances, the present invention has a simple structure, and does not increase the weight of the vehicle body. An object of the present invention is to provide a rear body structure of a vehicle that can obtain high rigidity with respect to a bending moment in a vehicle width direction received from a part suspended at a lower part of a rear frame.
[0016]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention provides a rear body of a vehicle having a pair of rear frames having a closed cross-sectional shape extending along the longitudinal direction of the vehicle body on both sides in the vehicle width direction, and a rear floor connecting the rear frames. In structureThe rear floor includes a front rear floor, a rear rear floor positioned below the front rear floor, a floor inclined portion that joins a rear portion of the front rear floor and a front portion of the rear rear floor, and the pair of rear frames A cross member that connects the lower cross member formed between a lower cross member member provided below the floor inclined portion and the rear floor including at least the floor inclined portion; and above the floor inclined portion. And an upper cross member closed section formed by the upper cross member member provided in the vehicle interior and the rear floor including at least the floor inclined portion, and a substantially rectangular cross section is formed by the both cross member closed sections. It is characterized by.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a perspective view of a main part of the rear vehicle body structure.
[0020]
Reference numeral 11 in the figure denotes a rear frame, which is disposed on both sides of the rear portion of the vehicle body in the vehicle width direction so as to face each other along the longitudinal direction of the vehicle body. Although not shown, the left rear frame is symmetrical with the right rear frame.
[0021]
The rear frame 11 has a lower rear frame member 12 and an upper rear frame member 13. The lower rear frame member 12 is formed in a cross-sectional groove shape opening upward, and extends substantially linearly from the rear of the vehicle body to the front. A flange portion 12b is formed at the upper end of the internal vertical wall surface 12a of the lower rear frame member 12, and the external vertical wall surface 12c is suspended upward from the internal vertical wall surface 12a.
[0022]
In the present embodiment, in the middle of the flange portion 12b in the longitudinal direction of the vehicle body, a flange inclined portion 12d is provided in the vicinity of a portion where a rear suspension (not shown) is disposed, and the flange inclined portion 12d is sandwiched between the flange inclined portion 12d. The rear stage of the internal vertical wall surface 12a is formed at a lower position than the front stage, and the underfloor parts 15 (see FIG. 4) such as a fuel tank and a rear differential case are disposed between the lower rear frame members 12 of the front stage. A rear wheel apron 16 is joined to the upper part of the outer vertical wall surface 12 c of the lower rear frame member 12.
[0023]
Further, the flange inclined portions 12 d of both lower rear frame members 12 disposed on both sides in the vehicle width direction are connected via a cross member member 18. As shown in FIGS. 3 and 4, the cross member member 18 is formed in a cross-sectional groove shape that opens upward, and a joint allowance 18 a that joins the inner vertical wall surface 12 a and the bottom surface of the lower rear frame member 12 at both ends thereof. Further, flange portions 18d and 18e are formed at the upper ends of the front vertical wall surface 18b and the rear vertical wall surface 18c, and further, at the center portion in the vehicle width direction of the front vertical wall surface 18b as required. A recess 18f for escaping the underfloor component 15 such as a fuel tank or a rear differential is formed.
[0024]
On both ends of the flange portions 18d and 18e of the cross member member 18, step portions 18g corresponding to the plate thickness of the flange portion 12b formed on the lower rear frame member 12 are formed. The flange portion 18e is joined to the lower end portion side of the flange inclined portion 12d of the lower rear frame member 12, and the other flange portion 18d is joined to the upper end portion side of the flange inclined portion 12d.
[0025]
Further, the upper surface between the pair of opposed lower rear frame members 12 is connected by a rear floor 19, and a floor inclined portion 19a is formed at a portion of the rear floor 19 corresponding to the flange inclined portion 12d formed on the lower rear frame member 12. ing. The rear floor 19 has a front rear floor 19b and a rear rear floor 19c across a floor inclined portion 19a. Further, the rear floor 19 is joined to the inner surface of the external vertical wall surface 12c of the lower rear frame member 12 on both sides of the rear floor 19 in the vehicle width direction. The second connecting portion 19d is bent into a flange shape. A tire recess 19e for storing a spare tire (not shown) is formed in the rear rear floor 19c of the rear floor 19.
[0026]
A cross member closed section 17 is formed by the cross member member 18, the rear portion of the front rear floor 19b that closes the upper surface of the cross member member 18, and the floor inclined portion 19a.
[0027]
The upper rear frame member 13 is joined to the upper surfaces of the floor inclined portion 19a and the rear rear floor 19c on both sides in the vehicle width direction. The upper rear frame member 13 is bent to have an L-shaped cross section, and has an internal vertical wall surface 13a continuous with the internal vertical wall surface 12a of the lower rear frame member 12 and an upper surface 13b continuous with the front rear floor 19b. A flange portion 13c corresponding to the flange portion 12b of the lower rear frame member 12 is formed at the lower end of the internal vertical wall surface 13a. Between the flange portions 12b and 13c, the floor inclined portion 19a and the rear rear floor 19c are formed. The upper and lower surfaces are joined, and portions of the floor inclined portion 19a and the rear rear floor 19c that are coupled to the flange portions 12b and 13c constitute a first coupling portion 19f. Further, a flange portion 13 d is formed at the outer end portion of the upper surface 13 b of the upper rear frame member 13 to be joined to the inner surface upper portion of the outer vertical wall surface 12 c of the lower rear frame member 12.
[0028]
As shown in FIG. 2A, the rear frame 11 is formed with an upper closed section 20a on the upper rear frame member 13 side and a lower portion on the lower rear frame member 12 side, with both side portions 19g of the rear floor 19 in the vehicle width direction as a boundary. A closed cross section 20b is formed. Accordingly, both side portions 19 g of the rear floor 19 in the vehicle width direction function as reinforcements of the rear frame 11.
[0029]
In this case, as shown in FIG. 2B, the rear side rear floor 19c may be almost completely flattened. Factors that make it possible to flatten the rear rear floor 19c include the use of narrow tires (emergency tires, etc.) as spare tires, no spare tires, or installation of spare tires on the rear rear floor 19c. In other words, since the rear floor board used as a loading platform is disposed as a flat surface continuous with the front rear floor 19b and the upper surface 13b of the upper rear frame member 13 above the rear rear floor 19c, the rear rear floor 19c If the height of the space formed by the rear floor board can be ensured, the rear rear floor 19c can be flattened while the spare tire is placed while keeping the loading platform height the same.
[0030]
According to such a configuration, the rear frame 11 is divided into the lower rear frame member 12 and the upper rear frame member 13, and the rear rear floor 19c and both side portions 19g of the floor inclined portion 19a are interposed therebetween. Since the upper closed section 20a and the lower closed section 20b are formed with the both side portions 19g as a boundary, the both side portions 19g can function as reinforcements, and the structure can be simplified and The drag can be improved, and the distance between the joint between the rear floor 19 and the rear frame 11 and the lower part of the rear frame 11 can be shortened. When the load in the vehicle width direction acts, it is possible to suppress the side frame of the rear frame 11 from falling sideways. Further, since the rear frame 11 is divided into the lower rear frame member 12 and the upper rear frame member 13, the correspondence of the collision performance can be easily changed by the variation of the upper rear frame member 13.
[0031]
Further, after the first coupling portion 19f and the second coupling portion 19d of the rear floor 19 are joined and fixed to the lower rear frame member 12 disposed on both sides in the vehicle width direction, the upper surface of the both side portions 19g is fixed. Since the upper rear frame member 13 is joined, assembly work using spot welding or the like is facilitated, and stable quality can be obtained.
[0032]
Further, since both side portions 19g of the rear rear floor 19c are interposed in the middle of the rear frame 11, as shown by a one-dot chain line in FIG. Compared with the height D, the depth Ds of the tire recess 19e can be reduced or eliminated while securing a spare tire storage space. Accordingly, the corners 19R and 19R of the tire recess 19e can be bent with a small curvature, or the tire recess 19e can be formed without flattening the rear floor 19, without significantly changing the production equipment. In addition, the formability and productivity of the rear floor 19 can be improved.
[0033]
Further, since the tire recess 19e can be formed with a shallow depth Ds, the rear frame 11 can be joined by moving the rear frame 11 inward in the vehicle body width direction by a width W from the conventional rear frame. As a result, as shown in FIG. 1, it becomes possible to extend the rear frame 11 substantially linearly in the longitudinal direction of the vehicle body and prevent early bending deformation of the rear frame 11 at the time of rear-end collision while reducing the weight. In addition, the shock absorption at the time of rear impact can be improved.
[0034]
Further, a rear rear floor 19c that also functions as a reinforcement for the rear frame 11 is coupled to the rear frame 11 by a first coupling portion 19f and a second coupling portion 19d provided on both side portions 19g thereof, thereby Since the frames 11 can be connected to each other and the depth Ds of the tire recess 19e can be reduced or eliminated, the plate direction of the rear rear floor 19c is transmitted in the left-right direction transmitted from the rear frame 11 as compared with the conventional structure. The load can be close to or the same. Therefore, the rear floor 19 can function as a shearing surface, and the left and right rear frames 11 can be firmly connected to each other by the rear floor 19, so that an impact load applied to the rear frame 11 at the time of a rear collision can be transmitted to the front of the vehicle body. Since the rear frame 11 can be stably crushed, the impact energy absorbability of the rear frame 11 is improved. In addition, the floor functions as a shearing surface even when a load is applied from below the rear frame 11, and the rigidity can be increased. Therefore, the load can be transmitted efficiently and the vibration performance can be improved.
[0035]
Further, since the depth Ds of the tire recess 19e is shallow, the floor inclined portion 19a or the front wall of the tire recess 19e can be moved to the rear of the vehicle body, and the cross member member disposed near the rear suspension mounting portion of the rear frame 11 18, the rear vertical wall surface 18 c can be expanded to the floor inclined portion 19 a or the lower end of the front wall of the tire recess 19 e, so that while the cross member member 18 is connected to the left and right rear frames 11 straight, Since the cross-sectional area can be increased, and accordingly, high rigidity can be obtained, it is possible to prevent the deterioration of the vibration performance and running performance due to the input from the rear suspension.
[0036]
In order to avoid interference with the underfloor parts 15 such as the fuel tank and the rear differential disposed at the lower part of the vehicle body, the front vertical wall surface 18b of the cross member 18 is relatively moved rearward. The recessed portion 18f to be formed can be formed with a minimum size, or the recessed portion 18f itself can be eliminated, and the moldability can be improved while ensuring high rigidity.
[0037]
Furthermore, since the cross member member 18 can be expanded to the front end portion of the rear rear floor 19c, deformation due to crushing at the time of a rear collision can be stopped behind the cross member member 18. Therefore, the parts disposed in front of the cross member member 18 such as the underfloor part 15 such as the fuel tank and the rear differential can be effectively protected from the impact load at the time of the rear impact.
[0038]
Furthermore, since the dead space of the tire recess 19e is eliminated as much as possible, the rear overhang can be reduced and a compact vehicle body can be formed. Further, when the rear floor 19 is flattened, a rear row three-row seat is possible, or when a rear floor boat is disposed on the rear rear floor 19c, an internal space formed between the periphery of the spare tire and the rear floor boat is reduced. It can be effectively used as a component storage pocket.
[0039]
FIG. 5 is an analysis diagram when the rear rear floor 19c is flattened and the load at the time of a rear impact is applied to the rear frame 11 and the rear floor 19 as indicated by arrows with both side portions 19g sandwiched between the rear frames 11. Indicates. 4A shows a state before applying a load, FIG. 4B shows a state in the process of deforming the rear frame 11 and the rear floor 19, and FIG. 3C shows a state at the end of deformation.
[0040]
As shown in the figure, the rear frame 11 can be extended substantially linearly by eliminating or reducing the depth Ds of the tire recess 19e as in the present embodiment, and the rear frame 11 is bent and deformed. The shaft can be crushed without doing so. Furthermore, since the rear floor 11 also functions as a shearing surface against the load transmitted from the rear frame 11, the rear frame 11 can be stably crushed without Euler buckling, and the impact energy of the rear frame 11 can be absorbed. Improves.
[0041]
As a result, as shown by the solid line a in FIGS. 6 and 7, the impact energy at the time of rear impact can be efficiently absorbed in a short stroke, as compared to the conventional structure shown by the broken line (see FIG. 20). Further, the drag force at the time of rear impact can be greatly improved as compared with the conventional structure.
[0042]
8 to 16 show a second embodiment of the present invention. 8 is a perspective view of the main part of the rear vehicle body structure, FIG. 9 is a sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is a sectional view taken along line XX in FIG.
[0043]
As shown in the figure, the rear floor 19 according to the present embodiment is divided into a front rear floor 19b and a rear rear floor 19c integrally having a floor inclined portion 19a, and a front portion 19h of the rear rear floor 19c, The flange portion 19j formed at the lower end of the floor inclined portion 19a is joined and integrated on the flange portion 18e formed at the upper end of the rear vertical wall surface 18c of the cross member member (hereinafter referred to as "lower cross member member") 18. Has been.
[0044]
Further, both side portions 19g of the rear rear floor 19c are formed to bend obliquely upward from a first coupling portion 19f joined to the flange portion 12b of the lower rear frame member 12, and a second coupling formed at the end thereof. The portion 19 d is joined to the upper end portion of the external vertical wall surface 12 c formed on the lower rear frame member 12 together with the flange portion 13 d formed on the upper rear frame member 13. In the rear frame 11, a triangular upper closed cross section 20a is formed on the upper rear frame member 13 side with both side portions 19g as a boundary, and a trapezoid lower closed cross section 20b is formed on the lower rear frame member 12 side. . Therefore, both side portions 19 g formed by bending obliquely above the rear floor 19 function as reinforcements for the rear frame 11.
[0045]
Next, the assembly procedure will be described. First, as shown in FIG. 11, flange inclined portions 12d of a pair of lower rear frame members 12 arranged on both sides in the vehicle width direction are connected by a lower cross member member 18, and then, as shown in FIG. The front portion 19 h of the side rear floor 19 c is joined to the flange portion 18 e of the lower cross member member 18. Further, the first coupling portion 19 f of both side portions 19 g is joined to the flange portion 12 b formed on the lower rear frame member 12. Further, the second connecting portion 19 d is joined to the upper end portion of the external vertical wall surface 12 c of the lower rear frame member 12.
[0046]
Next, as shown in FIG. 13, a flange portion 19j formed at the lower end of a floor inclined portion 19a formed by bending at the rear end of the front rear floor 19b is joined onto the front portion 19h of the rear rear floor 19c. Further, the first connecting portion 19f ′ and the second connecting portion 19d ′ provided on both side portions 19g ′ of the front rear floor 19b and the floor inclined portion 19a are connected to the flange portion 12b of the lower rear frame member 12 and the flange inclined portion. It joins to 12d and the upper end part of external vertical wall surface 12c, respectively.
[0047]
Thereafter, as shown in FIG. 14, the upper cross member member 21 is brought into contact with the floor inclined portion 19a. As shown in FIG. 15, the upper cross member member 21 is bent in an L shape, and is bent downward to form a rear vertical wall surface 21a, an upper surface 21b, and a flange portion 21c formed at the lower end of the rear vertical wall surface 21a. And flange portions 21d formed by bending at both ends of the upper surface in the vehicle width direction. Then, the flange portion 21c is joined to the flange portion 19j formed at the lower end of the floor inclined portion 19a, and the flange portion 21d is joined to the upper end portion of the external vertical wall surface 12c formed on the lower rear frame member 12. The flange portion 21c is cut in front of both end portions 19g formed by bending on the rear rear floor 19c.
[0048]
Further, the front portion 21e (the portion indicated by hatching in FIG. 15) of the upper surface 21b of the upper cross member member 21 is joined to the rear portion of the front rear floor 19b. Further, the flange portion 19k formed at the tip of both side portions 19g is joined to the rear vertical wall surface 21a of the upper cross member member 21. As a result, the lower cross member member 18, the rear portion of the front rear floor 19b, and the upper cross member member 21 form a cross member having a substantially rectangular cross section.
[0049]
And as shown in FIG. 16, the upper rear frame member 13 is joined on the lower rear frame member 12 on both sides 19g. A flange portion 13e that contacts the upper surface 21b and the rear vertical wall surface 21a of the upper cross member member 21 and a joint portion 13f (a portion indicated by hatching in FIG. 16) are formed at the front portion of the upper rear frame member 13. The flange portion 13e and the joint portion 13f are joined to the upper cross member member 21.
[0050]
As a result, as shown in FIG. 10, the upper cross member closed section 22a is formed by the floor inclined portion 19a and the upper cross member member 21, and the lower cross member member 18, the front rear floor 19b, and the floor inclined portion 19a are formed therebelow. Thus, the lower cross member closed section 22b is formed.
[0051]
Thus, according to the present embodiment, the both side portions 19g are formed to bend obliquely upward, and the second connecting portion 19d formed at the end portion thereof is formed into the external vertical wall surface 12c formed in the lower rear frame member 12. Therefore, by joining together with the flange portion 13d of the upper rear frame member 13, the welding work can be reduced by one step, and workability is improved. Further, since both end portions 19g can function as reinforcements that suppress the cross-sectional deformation of the rear frame 11, the rigidity can be improved.
[0052]
On the other hand, since the upper cross member member 21 is added to form the upper cross member closed section 22a and the lower cross member closed section 22b, higher rigidity can be obtained.
[0053]
FIG. 17 is a sectional view corresponding to FIG. 10 according to the third embodiment of the present invention. In the present embodiment, the floor inclined portion 19a is formed by bending over the front vertical wall surface 18b and the rear vertical wall surface 18c of the lower cross member member 18, and the front portion 21e and the flange portion 21c of the upper cross member member 21 are formed. The upper cross-section 20a and the lower closed cross-section 20b, which are joined to the flange portions 18d and 18e of the lower cross member member 18 and formed with the floor inclined portion 19a as a boundary, form a substantially rectangular closed cross-section. is there.
[0054]
According to such a configuration, the cross-sectional deformation of the lower cross member member 18 can be suppressed and a strong structure can be obtained.
[0055]
FIG. 18 is a sectional view corresponding to FIG. 17 according to the fourth embodiment of the present invention. In the present embodiment, the lower cross member member 18 is integrally formed with the front portion 19h of the rear rear floor 19c, and the number of components can be reduced by integrating the lower cross member member 18.
Other configurations and operational effects are the same as those in FIG.
[0056]
FIG. 19 is a sectional view corresponding to FIG. 17 according to the fifth embodiment of the present invention. In the present embodiment, the lower cross member member 18 is integrally formed at the rear portion of the front rear floor 19b, and the rear vertical wall surface 21a of the upper cross member member 21 is inclined to form the floor inclined portion 19a. Simplification is realized.
[0057]
【The invention's effect】
As described above, according to the present invention, the first coupling portion that couples the both side portions of the rear floor to the internal vertical wall surface between the upper end and the lower end of the internal vertical wall surface of each rear frame, Extending to the external vertical wall surface, it is connected to the rear frame with a second connecting part that is connected to the external vertical wall surface, so that both sides of the rear floor function as reinforcement for the rear frame. Therefore, with a simple structure, without increasing the weight of the vehicle body, it is possible to improve the resistance against rear impact, and at the same time, it has high rigidity against the bending moment in the vehicle width direction received from the parts suspended at the bottom of the rear frame Obtainable.
[0058]
In addition, the rear frame can be extended almost linearly, and the rear floor can function as a shearing field for the rear frame. Can be obtained, and good shock absorption can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a rear vehicle body structure according to a first embodiment.
2A is a sectional view corresponding to FIG. 1A, taken along line II-II in FIG. 1, and FIG. 2B is a sectional view corresponding to FIG.
FIG. 3 is a perspective view of the main part of the cross member.
4 is a sectional view taken along the line IV-IV in FIG.
FIG. 5 is an explanatory view showing a collapsed state of the rear frame and the rear floor at the time of rear collision.
FIG. 6 is an explanatory diagram showing the relationship between the internal energy at the time of rear collision and the stroke due to the crushing deformation of the rear frame and the rear floor.
FIG. 7 is an explanatory diagram showing the relationship between the average drag of the rear frame and the rear floor and the stroke caused by crushing deformation at the time of rear collision.
FIG. 8 is a perspective view of a main part of a rear vehicle body structure according to a second embodiment.
9 is a cross-sectional view taken along the line IX-IX in FIG.
10 is a sectional view taken along line XX in FIG.
FIG. 11 is a perspective view of the main part in a state where a cross member is joined to the lower rear frame member.
12 is a perspective view of the main part in a state where the rear rear floor is joined to the state shown in FIG.
13 is a perspective view of the main part in a state where the front rear floor is joined to the state shown in FIG.
14 is a perspective view of the main part in a state where the upper cross member member is joined to the state shown in FIG. 13; FIG.
FIG. 15 is a partial perspective view of the upper cross member member.
FIG. 16 is a perspective view of the main part in a state where the upper rear frame member is joined to the state shown in FIG. 14;
17 is a cross-sectional view corresponding to FIG. 10 according to a third embodiment.
18 is a cross-sectional view corresponding to FIG. 10 according to a fourth embodiment.
19 is a cross-sectional view corresponding to FIG. 10 according to a fifth embodiment.
FIG. 20 is a longitudinal sectional view showing a conventional rear body structure.
FIG. 21 is an explanatory view showing a crushing deformation state of the rear frame and the rear floor at the time of rear collision.
[Explanation of symbols]
11 Rear frame
12 Lower rear frame member
12a, 13a Internal vertical wall
13 Upper rear frame member
17 Lower cross member closed section
18 Cross member (lower cross member)
19 Rear floor
19a Inclined floor
19b Front rear floor
19c Rear rear floor
19d 2nd coupling | bond part
19f 1st coupling part
20a Upper closed section
20b Lower closed section
22a Upper cross member closed section
22b Lower cross member closed section

Claims (4)

In a rear body structure of a vehicle having a pair of rear frames having a closed cross-sectional shape extending along the longitudinal direction of the vehicle body on both sides in the vehicle width direction, and a rear floor connecting the rear frames.
The rear floor has a front rear floor, a rear rear floor positioned below the front rear floor, and a floor inclined portion joining the rear portion of the front rear floor and the front portion of the rear rear floor;
A cross member connecting the pair of rear frames, a lower cross member closed section formed by a lower cross member member provided below the floor inclined portion and the rear floor including at least the floor inclined portion; An upper cross member member provided in a passenger compartment above the floor inclined portion and an upper cross member closed cross section formed by at least the rear floor including the floor inclined portion, and substantially rectangular in both the cross member closed cross sections. rear vehicle body structure of the vehicles you characterized in that the formation of the cross-section. A first coupling portion that is coupled to the internal vertical wall surface between the upper end and the lower end of the internal vertical wall surface of each rear frame, and extends to the external vertical wall surface of each rear frame, on both sides of the rear floor. The rear vehicle body structure according to claim 1, further comprising a second coupling portion coupled to the external vertical wall surface . The rear frame is formed of an upper closed cross section having an upper rear frame member provided above the rear floor with both sides of the rear floor as a boundary, and a lower closed cross section having a lower rear frame member provided below the rear floor. rear vehicle body structure of a vehicle according to claim 1, characterized in that it is. 2. The rear body structure of a vehicle according to claim 1 , wherein the rear rear floor is formed flat.

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