Rear body structure of the vehicle

Abstract

To provide a rear vehicle body structure for a vehicle that is able to achieve high rigidity of a vehicle body rear part by a simple configuration.SOLUTION: A vehicle body 1 includes: a tunnel-shaped raised portion 27 formed by bending a rear floor panel 17 in a central area in a vehicle width direction and extending in a longitudinal direction of the vehicle body 1; and a flange 21 formed by bending a rear cross member 16 in the central area in the vehicle width direction of the vehicle body 1 and projecting from a front wall of the rear cross member 16 toward a front side of the vehicle body 1. A rear edge part of the rear floor panel 17 is connected to the rear cross member 16 while right and left side walls 27b on a rear-end side of the raised portion 27 abut on a side flange 21b of the flange 21.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a rear vehicle body structure provided below a rear seat of a vehicle.

Background Art

[0002] In general, vehicles such as automobiles have a rear floor panel below the rear seat. Left and right edges of the rear floor panel are connected to rear side frames or the like that extend in the front-rear direction of the vehicle body. Further, front and rear edges of the rear floor panel are connected to a cross member extending in the vehicle width direction.

[0003] Such a rear floor panel is generally formed of a thin plate having a large flat portion. For this reason, the rear floor panel has low rigidity and tends to easily generate vibration and noise. In response to this, for example, Patent Document 1 discloses a rear vehicle body structure for a vehicle including: a pair of rear frames extending in the vehicle front-rear direction; a rear cross member extending in the vehicle width direction, with both end portions thereof respectively joined to the pair of rear frames; a cross member provided in front of the rear cross member; a reinforcing member extending in the vehicle front-rear direction and connecting the rear cross member and the cross member; and a floor panel that forms a flat cross-section extending in the vehicle front-rear direction together with the reinforcing member.

Prior Art Literature

Patent Literature

[0004]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0005] However, the technology disclosed in the above-mentioned Patent Document 1 adopts a structure in which a reinforcing member for connecting the rear cross member and the cross member is added. Therefore, the technology disclosed in Patent Document 1 may increase the number of parts and complicate the structure.

[0006] Furthermore, in the technology disclosed in Patent Document 1 mentioned above, the connection between the rear cross member and the reinforcing member employs a structure in which the flange-shaped rear end of the reinforcing member is joined to the front surface of the rear cross member. Consequently, the load transmission efficiency between the rear cross member and the reinforcing member is low, which may make it difficult to sufficiently improve the rigidity of the rear of the vehicle body.

[0007] The present invention aims to provide a rear vehicle body structure that can achieve high rigidity at the rear of the vehicle body with a simple configuration. [Means for solving the problem]

[0008] A rear vehicle body structure according to one aspect of the present invention comprises a rear floor panel provided below the rear seats and a rear cross member to which the rear edge of the rear floor panel is connected, the rear vehicle body structure comprising: a tunnel-shaped protrusion formed by bending the rear floor panel in the central region in the vehicle width direction and extending in the longitudinal direction of the vehicle body; and a flange formed by bending the rear cross member in the central region in the vehicle width direction and projecting forward from the front wall of the rear cross member. A protruding plate extending from the upper rear end of the aforementioned raised portion towards the rear of the vehicle body, The left and right side walls on the rear end side of the raised portion are provided side Butt against the flange With the base end of the upper wall of the raised portion overlapping the upper surface of the upper flange, and the protruding plate overlapping the upper wall of the rear cross member, The rear edge of the rear floor panel is connected to the rear cross member. Furthermore, the rear body structure of a vehicle comprises a rear floor panel provided below the rear seats and a rear cross member to which the rear edge of the rear floor panel is connected, and includes a tunnel-shaped raised portion bent into the rear floor panel in the central region in the vehicle width direction and extending in the longitudinal direction of the vehicle body, a flange bent into the rear cross member in the central region in the vehicle width direction and projecting forward from the front wall of the rear cross member, a protruding plate projecting rearward from the upper rear end of the raised portion, and a recess formed in the upper wall of the central region in the vehicle width direction of the rear cross member, wherein the protruding plate is connected in a state overlapping the recess, and the rear edge of the rear floor panel is connected to the rear cross member with the left and right side walls on the rear end side of the raised portion abutting against the flange. [Effects of the Invention]

[0009] According to the vehicle rear body structure of the present invention, high rigidity of the rear of the vehicle body can be achieved with a simple configuration. [Brief explanation of the drawing]

[0010] [Figure 1] Perspective view showing the main parts of the vehicle's frame. [Figure 2] A perspective view showing a close-up of the rear section of the vehicle's frame. [Figure 3]Exploded perspective view showing the rear of the vehicle with the rear floor panel removed. [Figure 4] Diagram illustrating the load transmission path at the rear of the vehicle. [Figure 5] Perspective view showing the rear floor panel and part of the rear seat. [Modes for carrying out the invention]

[0011] The embodiments of the present invention will be described below with reference to the drawings. The drawings relate to one embodiment of the present invention, and Figure 1 is a perspective view showing the main parts of the vehicle body frame.

[0012] As shown in Figure 1, the body 1 of a vehicle such as an automobile has a pair of left and right side sills 5 and a pair of left and right rear side frames 6 as the lower frame of the body 1. In the following description, the joining of the parts constituting the body 1 is basically carried out by spot welding, arc welding, and laser welding, etc.

[0013] Each side sill 5 extends in the longitudinal direction of the vehicle body 1 on the left and right sides of the vehicle body 1. A floor panel 7, which forms the floor surface of the passenger compartment, is connected between these left and right side sills 5. A floor tunnel 8 is provided in the center of this floor panel 7 in the vehicle width direction.

[0014] Furthermore, a pair of front and rear cross members 9 are provided between each of the left and right side sills 5 and the floor tunnel 8. Each cross member 9 extends in the vehicle width direction. The left and right ends of each cross member 9 are connected to the side walls of the side sills 5 and the floor tunnel 8, respectively. In addition, the lower part of each cross member 9 is connected to the upper surface of the floor panel 7. Front seats are attached to the front and rear pairs of cross members 9 on the left and right sides of the floor tunnel 8 via seat rails (neither of which are shown).

[0015] As shown in Figures 1 and 2, the left and right rear side frames 6 extend in the front-rear direction of the vehicle body 1 at the left and right side portions of the vehicle body 1. The front end portions of these rear side frames 6 are respectively connected to the rear end portions of the left and right side sills 5.

[0016] Between the left and right rear side frames 6, a rear front cross member 15, a rear cross member 16, and a rear floor panel 17 are provided.

[0017] The rear front cross member 15 extends in the vehicle width direction near the front end portions of the left and right rear side frames 6. The left and right end portions of the rear front cross member 15 are respectively connected to the side walls and upper walls of the left and right rear side frames 6. Further, the lower portion of the rear front cross member 15 is connected to the rear end portion of the floor panel 7 via the wall portion 10.

[0018] Further, a flange 15a extending in the vehicle width direction is provided on an upper portion of the rear front cross member 15 (see FIG. 2). This flange 15a is bent and formed so as to protrude upward above the rear front cross member 15. This allows the front end portion of a rear floor panel 17, which will be described later, to be connected to the flange 15a.

[0019] The rear cross member 16 extends in the vehicle width direction rearward of the rear front cross member 15. The left and right end portions of the rear cross member 16 are respectively connected to the side walls and upper walls of the left and right rear side frames 6.

[0020] In the present embodiment, inner panels 16a that form part of a C-pillar 18 are integrally formed at the left and right end portions of the rear cross member 16. This inner panel 16a extends upward from the upper surface of the rear side frame 6.

[0021] As shown in Figure 3, a recess 20 is formed in the upper wall of the rear cross member 16. This recess 20 is formed in the central region of the rear cross member 16 in the vehicle width direction. As a result, the upper surface of the central region of the rear cross member 16 is set lower than the upper surface of other regions of the rear cross member 16.

[0022] Here, the width of the recess 20 in the vehicle width direction is set to, for example, about 20% of the width of the rear seat 50. As a result, for example, when two occupants are seated in the rear seat 50, the recess 20 is formed in an area that does not overlap with the seating area of ​​each occupant in the vehicle width direction. Also, for example, as shown in Figure 5, if the seat back 51 of the rear seat 50 is divided in a 6:4 ratio, the position of the boundary of the seat back 51 approximately coincides with one of the left or right boundaries of the recess 20.

[0023] Furthermore, a flange 21 is formed in the central region of the rear cross member 16 in the vehicle width direction. This flange 21 protrudes forward from the front wall of the rear cross member 16 toward the front of the vehicle body 1.

[0024] Specifically, it has a flange 21, for example, an upper flange 21a and a pair of left and right side flanges 21b. This flange 21 is formed, for example, by bending the front wall of the rear cross member 16.

[0025] The upper flange 21a is formed such that, for example, its width in the vehicle width direction is approximately the same as the width of the recess 20. Furthermore, the upper flange 21a protrudes forward from the vehicle body 1 from approximately the same height as the bottom surface of the recess 20.

[0026] The left and right side flanges 21b are integrally formed with the upper flange 21a, for example. That is, each side flange 21b is bent to extend downward from the left and right side edges of the upper flange 21a.

[0027] The rear floor panel 17 is made of, for example, a thin steel plate having a predetermined thickness. This rear floor panel 17 forms a floor surface for holding the seat cushion 52 (see Figure 5) of the rear seat 50.

[0028] Vertical wall portions 25 extending in the vertical direction are formed in the front and front-side regions of the rear floor panel 17. Due to these vertical wall portions 25, the upper surface of the front side of the rear floor panel 17 protrudes upward.

[0029] Furthermore, the rear floor panel 17 has a first inclined portion 26a and a second inclined portion 26b. The first inclined portion 26a is gently sloped downward from the front to the middle of the rear floor panel 17. The second inclined portion 26b is located behind the first inclined portion 26a and is sloped upward from the middle to the rear end of the rear floor panel 17. These first and second inclined portions 26a and 26b form a concave cushion housing portion 26 in the rear floor panel 17. This cushion housing portion 26 is capable of housing the seat cushion 52 of the rear seat 50.

[0030] Furthermore, a raised portion 27 is formed in the central region of the rear floor panel 17 in the vehicle width direction. This raised portion 27 has an upper wall 27a and left and right side walls 27b. These upper wall 27a and side walls 27b are formed by bending the rear floor panel 17. This raised portion 27 extends in the front-rear direction of the vehicle body 1. As a result, the raised portion 27 divides the cushion housing portion 26 into left and right sections.

[0031] The upper wall 27a of the raised portion 27 extends from the rear end to the front of the rear floor panel 17. This upper wall 27a has a substantially constant width from the rear end to the front. Furthermore, the width of this upper wall 27a is set to be substantially the same as the width of the upper flange 21a of the rear cross member 16.

[0032] Furthermore, the base end of the upper wall 27a is positioned so that it overlaps with the upper surface of the upper flange 21a when the rear floor panel 17 is attached to the rear cross member 16.

[0033] Furthermore, the upper surface of the upper wall 27a is formed by curvature, creating a concave curved surface that curves downward along the longitudinal direction of the vehicle body 1. Due to this curvature of the upper wall 27a, the raised portion 27 has a roughly saddle shape. Also, due to the curvature of the upper wall 27a, the upper surface of the raised portion 27 is set so that the rear end is lower than the front end.

[0034] Here, a protruding plate 28 is provided at the base end of the upper wall 27a, which protrudes to the rear of the vehicle body 1. This protruding plate 28 is made of a plate-shaped member integrally formed with the rear floor panel 17. The protruding plate 28 is positioned so that it overlaps the bottom surface of the recess 20 of the rear cross member 16 when the rear floor panel 17 is attached to the rear cross member 16.

[0035] Each of the left and right side walls 27b is integrally formed with the upper wall 27a. That is, each side wall 27b is bent so as to extend downward from the left and right side edges of the upper wall 27a. The base ends of each of these side walls 27b are set to overlap (butt against) the outer surfaces of each side flange 21b when the rear floor panel 17 is attached to the rear cross member 16.

[0036] As shown in Figure 3, flanges 17a are provided on both the left and right edges of the rear floor panel 17 for connecting the rear floor panel 17 to the rear side frame 6. In addition, flanges 17b are provided on the rear edge of the rear floor panel 17, excluding the raised portion 27, for connecting the rear floor panel 17 to the rear cross member 16.

[0037] The rear floor panel 17, configured in this way, is attached to the left and right rear side frames 6, the rear front cross member 15, and the rear cross member 16.

[0038] In other words, the vertical wall portion 25 of the rear floor panel 17 is welded, for example, to the flange 15a of the rear front cross member 15. As a result, the front portion of the rear floor panel 17 is attached to the rear front cross member 15.

[0039] Furthermore, the flanges 17a on both the left and right edges of the rear floor panel 17 are welded to the left and right rear side frames 6, respectively. As a result, the left and right side edges of the rear floor panel 17 are attached to the left and right rear side frames 6, respectively.

[0040] Furthermore, the flange 17b at the rear edge of the rear floor panel 17 is welded to the rear cross member 16. Also, the rear end of the raised portion 27 of the rear floor panel 17 is welded to the flange 21 of the rear cross member 16. In addition, the protruding plate 28 of the rear floor panel 17 is welded to the recess 20 of the rear cross member 16. In this way, the rear edge of the rear floor panel 17 is attached to the rear cross member 16.

[0041] In this case, when the raised portion 27 is welded to the flange 21, the rear end of each side wall 27b abuts against each side flange 21b of the rear cross member 16.

[0042] Furthermore, when welding the protruding plate 28 to the recess 20, the rear cross member 16 and a portion of the protruding plate 28 are covered by a pair of left and right reinforcing plates 30. The reinforcing plates 30 are welded to the rear cross member 16 in and around the recess 20. As a result, at least a portion of the protruding plate 28 is welded to the recess 20 together with each of the reinforcing plates 30.

[0043] Furthermore, a fuel tank (not shown) is located beneath the rear floor panel 17, which is attached to the vehicle body 1 in this manner.

[0044] According to this embodiment, the vehicle body 1 has a tunnel-shaped raised portion 27 that is bent into the rear floor panel 17 in the central region in the vehicle width direction and extends in the longitudinal direction of the vehicle body 1, and a flange 21 that is bent into the rear cross member 16 in the central region in the vehicle width direction of the vehicle body 1 and protrudes forward from the front wall of the rear cross member 16. The vehicle body 1 has a vehicle body structure in which the rear edge of the rear floor panel 17 is connected to the rear cross member 16 with the left and right side walls 27b on the rear end side of the raised portion 27 abutting against the side flanges 21b of the flange 21. This makes it possible to achieve high rigidity in the rear of the vehicle body 1 with a simple configuration.

[0045] In other words, in the rear body structure of the vehicle of this embodiment, a raised portion 27 extending in the longitudinal direction of the vehicle body 1 is formed in the central region of the rear floor panel 17 in the vehicle width direction. As a result, the flat portion of the rear floor panel 17, which is made of thin plate, is divided into left and right halves. Therefore, the rear floor panel 17 can be stiffened with a simple configuration without adding any new stiffening members. More specifically, vertical vibration in the center of the rear floor panel 17 can be suppressed by the raised portion 27, and the rear floor panel 17 can be stiffened efficiently.

[0046] In addition, the left and right side walls 27b on the rear end side of the raised portion 27 are connected in a state where they abut against the side flanges 21b of the flange 21 that protrudes from the front wall of the rear cross member 16. As a result, the rear end of the raised portion 27 is firmly connected to the rear cross member 16. Therefore, the rigidity of the raised portion 27 can be increased with a simple configuration, and the rigidity of the rear floor panel 17 can be increased more effectively.

[0047] Furthermore, as described above, by connecting the raised portion 27 to the rear cross member 16, a load path can be formed between the rear cross member 16 and the raised portion 27 for impact loads such as collision loads input from the rear side frame 6 (see Figure 4). Therefore, deformation of the rear cross member 16 and the like can be effectively suppressed, and the rigidity of the rear of the vehicle body 1 can be effectively increased. In particular, by connecting the raised portion 27 to the rear cross member 16 with the side wall 27b abutting against the side flange 21b, an efficient load path can be formed.

[0048] Furthermore, by connecting the raised portion 27 and the rear cross member 16 in the central region in the vehicle width direction, the hinge 53 for supporting the seat back 51 of the rear seat 50 can be formed compactly. That is, for example, as shown in Figure 5, in the vehicle body structure of this embodiment, each mounting point 53a of the hinge 53 can be set on the upper surfaces of the raised portion 27 and the rear cross member 16, respectively. As a result, each mounting point 53a of the hinge 53 can be set at approximately the same height, and the hinge 53 can be formed more compactly compared to a vehicle body structure using a rear floor panel 17 without a raised portion 27.

[0049] In this case, the upper part of the raised portion 27 and the rear cross member 16 are connected by overlapping a protruding plate 28 that extends from the upper rear end of the raised portion 27 with a recess 20 formed in the upper wall of the central region of the rear cross member 16 in the vehicle width direction. This further increases the connection strength between the raised portion 27 and the rear cross member 16. Therefore, the rigidity of the rear of the vehicle body 1 can be increased more effectively. In addition, various cables such as power cables and signal cables can be routed through the recess 20 without excessive interference with the rear seats 50.

[0050] Furthermore, the upper surface of the raised portion 27 is formed by a concave curved surface. This ensures that even in the central region in the vehicle width direction where the raised portion 27 is formed, there is sufficient space for the seat cushion 52 in the thickness direction.

[0051] Furthermore, the width of the upper wall 27a of the raised portion 27 in the vehicle width direction is set to be approximately constant at the front and rear of the vehicle body 1. This makes it possible to form the raised portion 27 without unnecessarily curving the side wall 27b. Therefore, when collision loads, etc., are transmitted through the raised portion 27, it is possible to prevent the load from concentrating on a specific part of the side wall 27b, and the rigidity of the raised portion 27 can be further increased.

[0052] The inventions described in the above embodiments are not limited to those forms, and various modifications can be made in the implementation stage without departing from the gist of the invention. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriate combinations of the multiple constituent elements disclosed.

[0053] For example, if the problem described can be solved and the effects described can be obtained even if some of the constituent elements shown in the embodiment are deleted, then the configuration with the deleted constituent elements can be extracted as an invention. [Explanation of symbols]

[0054] 1 ... Vehicle body 5… Side sill 6… Rear side frame 7… Floor panel 8… Floor tunnel 9… Crossmember 10…Wall part 15… Rear cross member 15a ... Flange 16… Rear cross member 16a ... Inner panel 17… Rear floor panel 17a ... Flange 17b ... Flange 18… C-pillar 20 ... recess 21… Flange 21a ... Upper flange 21b ... Side flange 25 … Vertical wall part 26… Cushion storage section 26a ... First inclined section 26b … Second inclined section 27 … Protuberance 27a … Upper wall 27b … side wall 28 … Projection plate 30… Reinforcement plate 50... Rear seats 51... Seat back 52… Seat cushion 53… Hinge 53a ... Mounting point

Claims

1. A rear body structure of a vehicle comprising a rear floor panel located below the rear seats and a rear cross member to which the rear edge of the rear floor panel is connected, A tunnel-shaped protrusion is formed by bending the rear floor panel in the central region in the width direction of the vehicle, and extends in the front-rear direction of the vehicle body. A flange is bent and formed in the central region in the vehicle width direction of the rear cross member, and protrudes forward from the front wall of the rear cross member toward the front of the vehicle body, A protruding plate extending from the upper rear end of the aforementioned raised portion towards the rear of the vehicle body, Equipped with, A rear body structure for a vehicle characterized in that the left and right side walls on the rear end of the raised portion abut against the side flanges of the flange, the base end of the upper wall of the raised portion overlaps with the upper surface of the upper flange of the flange, and the rear edge of the rear floor panel is connected to the rear cross member with the protruding plate overlapping with the upper wall of the rear cross member.

2. A rear body structure of a vehicle comprising a rear floor panel provided below the rear seats and a rear cross member to which the rear edge of the rear floor panel is connected, A tunnel-shaped protrusion is formed by bending the rear floor panel in the central region in the width direction of the vehicle, and extends in the front-rear direction of the vehicle body. A flange is bent and formed in the central region in the vehicle width direction of the rear cross member, and protrudes forward from the front wall of the rear cross member toward the front of the vehicle body, A protruding plate extending from the upper rear end of the aforementioned raised portion towards the rear of the vehicle body, The rear cross member comprises a recess formed in the upper wall of the central region in the vehicle width direction, The protruding plate is connected in a state where it is overlapped with the recess. A rear body structure of a vehicle characterized in that the rear edge of the rear floor panel is connected to the rear cross member with the left and right side walls on the rear end side of the raised portion abutting against the flange.

3. The rear body structure of a vehicle according to claim 2, characterized in that the upper surface of the raised portion is formed by a concave curved surface that curves along the longitudinal direction of the vehicle body.

4. The rear body structure of a vehicle according to claim 2, characterized in that the width of the raised portion is constant at the front and rear of the vehicle body.

Images