JP7151385B2 - rear body structure - Google Patents

Description

The present invention relates to a vehicle body rear structure.

For example, as disclosed in Patent Document 1, a vehicle is known in which a back door opening is provided at the rear portion of the vehicle body. The back door opening is formed with a portion where the load tends to concentrate. For example, when load input from the road surface is received from below the back door opening, the load in the vehicle vertical direction and vehicle width direction (horizontal direction) is input at the vehicle width direction outer side of the back door opening, Torsional deformation can occur.

In order to improve the strength of the back door opening, for example, in the structure disclosed in Patent Document 1, a rear pillar inner panel is arranged outside the back door opening in the vehicle width direction. The roof side rail inner is joined to. By connecting the rear pillar inner panel to the roof side rail inner in this manner, the rigidity of the back door opening is improved.

Japanese Patent No. 6062044

In the above example, it is possible to improve the strength of the back door opening adjacent to the roof side rail. If there is such a bulging portion, it may not be possible to sufficiently reinforce the bulging portion. Therefore, there is room for improvement in the above example in terms of improving the strength of the back door opening.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and its object is to provide a bulging portion that bulges rearward of the vehicle on the outside in the vehicle width direction of the back door opening at the rear portion of the vehicle body. It is an object of the present invention to provide a vehicle body rear portion structure capable of effectively improving the strength of the bulging portion in such a case.

A vehicle body rear structure according to the present invention for achieving the above object comprises a back panel disposed at a vehicle width direction intermediate portion of a back door opening at a vehicle rear portion, and a vehicle body rear portion disposed at a vehicle width direction side portion of the back door opening. and a front quarter panel disposed on the vehicle front side of the rear quarter panel, and the rear quarter panel bulges rearward of the vehicle as it goes downward of the vehicle. The rear quarter panel positioned on the vehicle lower side of the bulging portion is bent inward in the vehicle width direction and joined to the back panel. In the vehicle body rear structure, a reinforcement extending in the vehicle width direction is provided on the vehicle front side of the rear quarter panel where the bulging portion is located. The rear part of the panel is joined at a first joint portion extending in the vehicle vertical direction, the vehicle width direction outer portion of the reinforcement is joined to the first joint portion, and the front quarter panel is joined to the upper part. The positioned front quarter upper panel and the lower front quarter lower panel are joined at a second joint portion extending in the longitudinal direction of the vehicle, and the second joint portion is the upper end of the reinforcement. and a lower end thereof, and the inner portion in the vehicle width direction of the reinforcement is joined to the rear quarter panel positioned at the edge of the back door opening.

ADVANTAGE OF THE INVENTION According to the present invention, when a bulging portion that bulges rearward of the vehicle is provided on the vehicle width direction outside portion of the back door opening of the rear portion of the vehicle body, the strength of the bulging portion is effectively improved. be able to.

1 is a perspective view of a vehicle body rear portion structure according to the present invention as viewed from the vehicle interior; FIG. FIG. 2 is a rear view of the back door opening of FIG. 1 as seen from the rear of the vehicle; FIG. 2 is an enlarged perspective view of the reinforcement of FIG. 1 and its surroundings; FIG. 3 is a rear perspective view of the back door opening of FIG. 2 as seen from the rear of the vehicle; FIG. 2 is a side view of the front quarter panel of FIG. 1 as seen from the inside in the vehicle width direction; FIG. 6 is a plan cross-sectional view of the AA cross section of FIG. 5 as seen from above the vehicle; FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5; FIG. 2 is a rear perspective view of the reinforcement of FIG. 1 and its surroundings as seen from the rear of the vehicle at the middle portion in the vehicle width direction of the back door opening.

An embodiment of the vehicle body rear portion structure according to the present invention will be described below with reference to the drawings (FIGS. 1 to 8). In the drawings, the direction of arrow Fr indicates the front in the longitudinal direction of the vehicle. "Front part (end) and rear part (rear end)" in the description of the embodiment correspond to the front part and the rear part in the longitudinal direction of the vehicle. The direction of arrow O indicates the outside in the vehicle width direction.

As shown in FIGS. 1 and 3, the vehicle body rear portion structure of this embodiment has a back door opening 1 at the vehicle body rear portion. In addition, the vehicle body rear structure includes a back panel 10 arranged at the vehicle width direction middle portion of the back door opening 1, a rear quarter panel 20 arranged at the vehicle width direction side portion of the back door opening 1, A front quarter panel 30 arranged on the vehicle front side of the rear quarter panel 20 and a reinforcement 35 are provided. Further, the vehicle body rear structure includes a back panel skirt 15 , a wheel house inner panel 45 , a lamp house panel 44 and a floor panel 49 .

First, the structure around the rear quarter panel 20 and the front quarter panel 30 will be described. The back panel 10 is a member extending in the vehicle width direction, and is arranged in the vehicle width direction intermediate portion below the back door opening 1 . The back panel 10 has an upper surface portion 11 , a front wall portion 1313 and a rear wall portion 14 . The upper surface portion 11 extends in the vehicle width direction, faces the upper side of the vehicle, and constitutes the lower edge of the back door opening portion 1 . The front wall portion 13 extends downward in the vehicle from the front end of the upper surface portion 11 and extends in the vehicle width direction. The rear wall portion 14 extends downward in the vehicle from the rear end of the upper surface portion 11 and extends in the vehicle width direction.

As shown in FIGS. 1 and 2, the back panel skirt 15 is a member that covers the rear wall portion 14 of the back panel 10 from the rear of the vehicle and extends downward from the back panel 10 with respect to the vehicle. The lower portion of the front wall portion 13 of the back panel 10 is joined to the front wall of the back panel skirt 15 by spot welding. A rear quarter lower panel 26, which will be described later, is joined to the vehicle width direction outer portion of the back panel skirt 15. The back panel skirt 15 and the rear quarter lower panel 26 form a closed cross section. rigidity is enhanced. A lamp house panel 44 is joined to the outer portion of the back panel skirt 15 in the vehicle width direction. A side body outer panel 43 constituting the outermost part of the vehicle body is arranged outside the lamp house panel 44 in the vehicle width direction.

The wheel house inner panel 45 is a member that is arranged below the front quarter panel 30 in the vehicle and protrudes inward in the vehicle width direction from the wall surface of the front quarter panel 30 . In the wheel house inner panel 45, a wheel house inner front portion 45a, a wheel house inner middle portion 45b, and a wheel house inner rear portion 45c are arranged in this order from the front side to the rear side of the vehicle and joined together. The wheel house inner front portion 45a, the wheel house inner middle portion 45b, and the wheel house inner rear portion 45c are joined to the rear side member. The rear side members are arranged to form a pair on the left and right sides of the vehicle body, extend in the vehicle front-rear direction, and are highly rigid members that constitute the vehicle body skeleton.

The wheel house inner middle portion 45b extends upward from the vehicle with respect to the wheel house inner front portion 45a and the wheel house inner rear portion 45c. A shock absorber (not shown) is attached to the wheel house inner middle portion 45b. The wheel house inner middle portion 45b extends upwardly of the vehicle, so that the input from the shock absorber can be transmitted to the rear side member. As a result, the load applied to the front quarter panel 30 is reduced, and the rigidity of the front quarter panel 30 in the vehicle width direction is improved.

Next, the rear quarter panel 20 and the front quarter panel 30 will be explained. First, the rear quarter panel 20 will be described.

As shown in FIGS. 1 and 3, the rear quarter panel 20 is a member arranged on the side of the back door opening 1 in the vehicle width direction. Accordingly, a bulging portion 25 bulging rearward of the vehicle is provided, and the lower portion of the bulging portion 25 is bent inward in the vehicle width direction and joined to the upper surface portion 11 of the back panel 10 . The rear quarter panel 20 has a rear quarter upper panel 21 and a rear quarter lower panel 26, which are arranged side by side in the vertical direction of the vehicle.

The rear quarter lower panel 26 has a front wall portion 28 and an inner surface portion 27, as shown in FIGS. The front wall portion 28 faces the front of the vehicle and extends in the vertical direction of the vehicle. The inner surface portion 27 is a portion that protrudes rearward of the vehicle from the inner end of the front wall portion 28 in the vehicle width direction, and constitutes the side edge of the back door opening 1 in the vehicle width direction. The inner surface portion 27 is joined to the upper surface portion 11 of the back panel 10 . The inner surface portion 27 extends outward in the vehicle width direction from the upper surface portion 11, curves upwardly of the vehicle, and extends upwardly of the vehicle. A portion of the inner surface portion 27 that is joined to the upper surface portion 11 faces the upper side of the vehicle, and a portion that curves and extends upwardly of the vehicle faces the inner side in the vehicle width direction.

Like the rear quarter lower panel 26, the rear quarter upper panel 21 has a front wall portion 23 and an inner surface portion 22, as shown in FIGS. The front wall portion 23 faces the front of the vehicle and extends so as to be inclined toward the front of the vehicle from the rear of the vehicle. Further, the front wall portion 23 is bent toward the front of the vehicle at the intermediate portion in the vehicle width direction, and is slightly inclined toward the front of the vehicle from the bent portion toward the outside in the vehicle width direction. The front end of the front wall portion 23, that is, the front end of the inclined portion, is inclined upward toward the front of the vehicle. This portion is provided with a first joint portion 51, which will be described later.

The inner surface portion 22 is a portion that protrudes rearward of the vehicle from the inner end of the front wall portion 23 in the vehicle width direction, and constitutes the side edge of the back door opening 1 in the vehicle width direction. The inner surface portion 22 of the rear quarter upper panel 21 inclines toward the vehicle rearward from the upper end toward the vehicle lower side, curves downward in the vehicle vertical direction intermediate portion of the inner surface portion 22 , and extends to the vehicle lower inner surface portion 22 of the rear quarter lower panel 26 . and constitute the side edge of the back door opening 1 in the vehicle width direction.

1 and 3, the bulging portion 25 is continuously provided from the rear portion of the inner surface portion 22 of the rear quarter upper panel 21 to the rear portion of the inner surface portion 27 of the rear quarter lower panel 26. .

As shown in FIGS. 1 and 3 , the front quarter panel 30 is a member located on the vehicle rear side of the vehicle width direction side portion of the vehicle body, and is joined to the front portion of the rear quarter panel 20 to allow the vehicle to move from the front portion. extending forward. The front quarter panel 30 has a front quarter upper panel 31 and a front quarter lower panel 32 . The front quarter upper panel 31 extends forward of the vehicle from the front portion of the rear quarter upper panel 21, and the front quarter lower panel 32 is arranged on the vehicle front side of the rear quarter lower panel 26 and extends in the vehicle front-rear direction.

The front quarter upper panel 31 and the front quarter lower panel 32 are arranged side by side in the vertical direction of the vehicle. The rear portion of the front quarter upper panel 31 and the rear portion of the front quarter lower panel 32 continuously extend in the vertical direction of the vehicle. A lower portion of the front quarter upper panel 31 and an upper portion of the front quarter lower panel 32 extend in the vehicle front-rear direction.

Here, the joints of each panel will be described. As shown in FIGS. 1 , 3 and 5 , the front portion of the rear quarter panel 20 and the rear portion of the front quarter panel 30 are joined at a first joining portion 51 . More specifically, the front end of the front wall portion 23 of the rear quarter upper panel 21, which is outside the bent portion in the vehicle width direction, and the rear portion of the front quarter upper panel 31 are connected at the first joint portion 51. Joined by spot welding. The first joint portion 51 is configured by a flange that extends obliquely upward toward the front of the vehicle. The first joint portion 51 has a plurality of welding points, and these welding points are spaced apart in the vertical direction of the vehicle.

The front portion of the front quarter lower panel 32 and the rear portion of the rear quarter lower panel 26 are spaced apart.

As shown in FIGS. 1, 3 and 5, the lower portion of the front quarter upper panel 31 and the upper portion of the front quarter lower panel 32 are joined at the second joint portion 52 by spot welding. The second joint portion 52 is configured by a flange extending along the vehicle front-rear direction. The second joint portion 52 has a plurality of welding points, and these welding points are spaced apart in the longitudinal direction of the vehicle.

As shown in FIGS. 1 and 3 to 5 , the lower portion of the rear quarter upper panel 21 and the upper portion of the rear quarter lower panel 26 are joined at a third joint portion 53 . Specifically, the lower portion of the inner surface portion 22 of the rear quarter upper panel 21 and the upper portion of the inner surface portion 27 of the rear quarter lower panel 26, and the lower portion of the front wall portion 23 of the rear quarter upper panel 21 and the rear quarter lower panel 26 An upper portion of the front wall portion 28 located on the inner side in the vehicle width direction of the bent portion is joined by spot welding at a third joint portion 53 . The third joint portion 53 has a portion extending in the vehicle front-rear lateral direction and a portion extending in the vehicle width direction, and is configured in an L shape when viewed from above.

Next, the reinforcement 35 will be explained. As shown in FIGS. 1, 3 and 4, the reinforcement 35 is provided on the vehicle front side of the rear quarter panel 20 where the bulging portion 25 is located. The reinforcement 35 is a member that extends in the vehicle width direction as a whole. A second joint portion 52 is arranged between them, and the inner portion of the reinforcement 35 in the vehicle width direction is joined to the rear quarter panel 20 positioned at the edge of the back door opening 1 . Also, the reinforcement 35 is joined to the rear quarter lower panel 26 and the rear quarter upper panel 21 . The shape and bonding of the reinforcement 35 will be described below.

As shown in FIGS. 1 and 5, the reinforcement 35 has a triangular shape extending in the vehicle width direction when viewed from above, and a rectangular shape extending in the vehicle width direction when viewed from the side, and has a substantially triangular prism shape as a whole. One vertex of the triangular shape viewed from above corresponds to a bent portion of the front wall portion 23 of the rear quarter upper panel 21, and two sides extending from the vertex correspond to the front wall of the rear quarter upper panel 21. It extends along the wall surface to the portion 23 .

The rectangle viewed from the side extends at an angle toward the front of the vehicle as it extends outward in the vehicle width direction. The rectangular inner portion in the vehicle width direction is positioned at the inner end in the vehicle width direction of the front wall portion 23 of the rear quarter upper panel 21, and the rectangular outer portion in the vehicle width direction is positioned at the front wall portion of the rear quarter upper panel 21. It is located in front of 23.

The reinforcement 35 has an inner flange portion 36, an outer flange portion 37, an upper flange portion 38, and a lower flange portion 39, as shown in FIGS. The outer flange portion 37 protrudes forward of the vehicle from the vehicle width direction outer end of the reinforcement 35, that is, from the vehicle width direction outer short side of the above-described rectangle, and extends in the vehicle vertical direction. The outer flange portion 37 is joined to the first joint portion 51 , and the second joint portion 52 is arranged between the upper end and the lower end of the outer flange portion 37 .

In this embodiment, a region from a position slightly below the center of the outer flange portion 37 in the vertical direction of the vehicle to the upper end thereof is joined to the first joint portion 51 . A region from the lower position to the lower end of the outer flange portion 37 is joined to the rear and upper portions of the front quarter lower panel 32 . In this example, the position on the lower side corresponds to the second joint portion 52 .

The inner flange portion 36 protrudes rearward of the vehicle from the vehicle width direction inner end of the reinforcement 35, that is, from the vehicle width direction inner short side of the above-described rectangular shape, and extends in the vehicle vertical direction. The inner flange portion 36 is joined to the inner surface located at the edge of the back door opening 1 . In this example, the upper portion of the inner flange portion 36 is spot welded to the inner surface portion 22 of the rear quarter upper panel 21, and the lower portion thereof is spot welded to the inner surface portion 27 of the rear quarter lower panel 26. A plurality of welding points of spot welding are arranged at intervals along the vertical direction of the vehicle. That is, the third joint portion 53 is arranged between the upper end and the lower end of the inner flange portion 36 of the reinforcement 35 .

The upper flange portion 38 is provided along two sides of the front end of the triangular upper surface of the reinforcement 35 and protrudes upward from the two sides of the vehicle. Similarly, the lower flange portion 39 is provided along two sides of the front end of the triangular lower surface of the reinforcement 35 and protrudes downward from the vehicle from the two sides. The upper flange portion 38 is spot welded to the front wall portion 23 of the rear quarter upper panel 21, and the lower flange portion 39 is spot welded to the front wall portion 28 of the rear quarter lower panel 26. there is A plurality of spot welding points are spaced apart in the vehicle width direction.

When a vertical load is applied from the road surface to the lower portion of the vehicle body, the load is applied to the bulging portion 25 in the vehicle vertical direction and vehicle width direction, and the back door opening 1 is torsionally deformed. The load in the vehicle width direction is generated because the back panel 10 and the rear quarter lower panel 26 are curved and joined. In this embodiment, the reinforcement 35 is joined to the front quarter panel 30 on the side of the vehicle body and to the rear quarter panel 20 to improve the rigidity in the vehicle vertical direction and vehicle width direction. can be done.

As shown in FIGS. 1 and 3, the wheel inner house 45 and the rear side member are joined to the front wall portion 28 of the rear quarter lower panel 26. Therefore, the rear quarter lower panel 26 is positioned in the vehicle width direction and the vehicle. A portion with high rigidity is formed in the vertical direction. Furthermore, in the present embodiment, by joining the rear quarter lower panel 26 and the reinforcement 35, the reinforcement 35 is joined to both the rear quarter upper panel 21 and the rear quarter lower panel 26. . As a result, the rigidity of the rear quarter lower panel 26 in the vehicle width direction and the vehicle vertical direction can be transmitted to the reinforcement 35 .

For example, if the thickness of the rear quarter lower panel 26 is set to be thicker than the thickness of the rear quarter upper panel 21, the load concentrates on the third joint 53 at the bottom of the rear quarter upper panel 21. end up On the other hand, in this embodiment, since the reinforcement 35 and the rear quarter lower panel 26 are joined, the load can be distributed from the third joint 53 where the load is concentrated to the reinforcement 35. It becomes possible.

As shown in FIGS. 7 and 8, the lamp house panel 44 and the rear quarter upper panel 21 of this embodiment form a closed cross section, and the lamp house panel 44 and the rear quarter lower panel 26 form a closed cross section. be. These closed cross sections are continuous in the vertical direction of the vehicle. A brace 41 is attached to the rear quarter lower panel 26 .

As shown in FIG. 6, the brace 41 is a substantially trapezoidal plate-like member, and flanges 42a to 42c are provided around it. As shown in FIG. 4, the brace 41 is inclined downward toward the outside in the vehicle width direction.

As shown in FIGS. 3 and 4, the brace 41 has a front flange 42a projecting upwardly of the vehicle at the front portion thereof, and an inner flange 42b projecting upwardly of the vehicle at the vehicle width direction inner side of the brace 41. and two rear flanges 42c are provided at the rear of the flanges.

The front flange 42a is joined to the back surface (rear surface) of the front wall portion 28 of the rear quarter lower panel 26 that constitutes the inner wall of the closed cross section, and the inner flange 42b is joined to the back surface (vehicle width direction outer surface) of the inner surface portion 27. It is Furthermore, the two rear flanges 42c are joined to the wall surface of the lamphouse panel 44 that constitutes the inner wall of the closed cross section. A part of the joint position where the brace 41 is joined is arranged between the upper end and the lower end of the outer flange portion 37 of the reinforcement 35 . In this example, the front portion of the inner flange 42 b and the inner portion of the front flange 42 a in the vehicle width direction are arranged between the upper end and the lower end of the outer flange portion 37 of the reinforcement 35 .

The brace 41 is arranged in the closed cross section and joined to the front wall portion 28 and the inner surface portion 27 that constitute the inner wall of the closed cross section, thereby providing high rigidity in the vehicle width direction, the vehicle vertical direction, and the vehicle longitudinal direction. It becomes possible to improve the torsional rigidity. Further, by arranging the joint portion of the brace 41 as described above, the load in the vehicle width direction input to the back door opening 1 can be supported via the reinforcement 35 .

3 and 4, the rear quarter lower panel 26 is sandwiched between the reinforcement 35 and the brace 41 and joined together. Thereby, the rigidity of the brace 41 can be transmitted to the reinforcement 35, and the torsional rigidity and strength can be improved.

Further, as shown in FIGS. 3 and 4, the reinforcement 35 and the third joint portion 53 overlap each other when viewed in the vehicle width direction. At the third joint portion 53, the rear quarter upper panel 21 and the rear quarter lower panel 26 overlap, so that the rigidity is improved. can be used.

Further, as shown in FIG. 8, the lamp house panel 44 is provided with two brake lamp fixing portions 44a for fixing the brake lamp 47 with a space therebetween in the vertical direction of the vehicle. Since the brake lamp 47 is heavy, a load is input to the brake lamp fixing portion 44a. In the present embodiment, since the lower brake lamp fixing portion 44a is arranged behind the third joint portion 53 in the vehicle, the load input to the brake lamp fixing portion 44a can be supported by the reinforcement 35. is possible.

The description of the present embodiment is an example for describing the present invention, and does not limit the invention described in the claims. Moreover, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope described in the claims.

1 back door opening 10 back panel 11 upper surface 13 front wall 14 rear wall 15 back panel skirt 20 rear quarter panel 21 rear quarter upper panel 22 inner surface 23 front wall 25 bulge 26 rear quarter lower panel 27 inner surface portion 28 front wall portion 30 front quarter panel 31 front quarter upper panel 32 front quarter lower panel 35 reinforcement 36 inner flange portion 37 outer flange portion 38 upper flange portion 39 lower flange portion 41 brace 42a front flange 42b inner flange 42c Rear flange 43 Side body outer panel 44 Lamp house panel 44 a Brake lamp fixing part 45 Wheel house inner panel 45 a Wheel house inner front part 45 b Wheel house inner middle part 45 c Wheel house inner rear part 47 Brake lamp 49 Floor panel 51 First joint part 52 Second joint 53 Third joint

Claims (5)

A back panel disposed at a vehicle width direction middle portion of a back door opening at a rear portion of the vehicle body, a rear quarter panel disposed at a vehicle width direction side portion of the back door opening, and a vehicle front of the rear quarter panel. a front quarter panel positioned on the side;
A bulging portion that bulges toward the rear of the vehicle as it goes downward is provided at the rear portion of the rear quarter panel. In a vehicle rear structure that is curved and joined to the back panel,
A reinforcement extending in the vehicle width direction is provided on the vehicle front side of the rear quarter panel where the bulging portion is located,
The front portion of the rear quarter panel and the rear portion of the front quarter panel are joined at a first joint portion extending in the vehicle vertical direction, and the outer portion of the reinforcement in the vehicle width direction is connected to the first joint portion. joined to the part,
The front quarter panel is formed by joining an upper front quarter panel and a lower front quarter lower panel together at a second joint extending in the longitudinal direction of the vehicle. is disposed between the upper and lower ends of the reinforcement,
The vehicle rear portion structure, wherein the inner portion of the reinforcement in the vehicle width direction is joined to the rear quarter panel positioned at the edge of the back door opening. The rear quarter panel is formed by joining a rear quarter upper panel positioned at an upper portion and a rear quarter lower panel positioned at a lower portion at a third joint portion extending in the longitudinal direction of the vehicle,
The third joint is arranged between the upper end and the lower end of the reinforcement,
2. The vehicle body rear portion structure according to claim 1, wherein the reinforcement is joined to the rear quarter lower panel and the rear quarter upper panel. The rear quarter lower panel extends in the vertical direction of the vehicle and has a front wall portion facing the front of the vehicle, and an inner surface portion protruding rearward of the vehicle from the inner end of the front wall portion in the vehicle width direction and facing the inner side of the vehicle. death,
3. The vehicle body rear portion structure according to claim 2, wherein a brace is joined to the front wall portion and the inner surface portion between the upper end and the lower end of the reinforcement. 4. The vehicle body rear portion structure according to claim 3, wherein the reinforcement and the brace are joined to the rear quarter lower panel while sandwiching the rear quarter lower panel. The vehicle body rear portion structure according to any one of claims 2 to 4, wherein the reinforcement and the third joint portion overlap each other when viewed in the vehicle width direction.

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