JP4979002B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a vehicle body rear structure including a side member that supports a floor panel, a support bracket that supports a suspension arm of a suspension device, and a reinforcing member that is respectively coupled to the support bracket.

  Conventionally, the vehicle body rear structure of the automobile is disclosed in Patent Document 1 below. According to this publication, each side part of the rear part of the vehicle body is configured to extend in the front-rear direction, and a side member that supports the floor panel is provided, and the rear wheel is suspended from the side member by a suspension device. . The side member includes a side member main body having an inverted hat shape as viewed in the longitudinal direction, and a lid plate that closes an upper end opening of the side member main body and is coupled to the side member main body. Yes. A halfway portion in the longitudinal direction of the side member is shaped to be raised rearward so that the rear portion is positioned higher than the front portion of the side member. A support bracket that supports one end of a suspension arm that constitutes the suspension device is coupled to the middle portion of the side member. In this case, it is supposed that the support bracket does not narrow the minimum ground clearance of the vehicle body by connecting the support bracket to the middle part of the side member that is shaped to rise rearward.

JP 2003-285656 A

  By the way, when the automobile is running, a large external force is applied to the middle part of the side member from the rear wheel side through the suspension arm and the support bracket. Here, as described above, the middle part of the side member has a rearward rising shape. For this reason, the external force may act as a large moment that tilts the midway part left and right with respect to the front part of the side member. If the side member tilts to the left and right as described above, there arises an inconvenience that the operability of the automobile is hindered and its durability is lowered.

  Therefore, in order to prevent the occurrence of the above inconvenience, it is conceivable to reinforce each of the side members by laying cross members at both middle portions of the left and right side members. However, first, a fuel tank may be disposed between the left and right side members. In this case, the fuel tank may become an obstacle and the cross member may not be easily installed. Secondly, although the cross member exhibits a sufficient reinforcing effect, it is large and heavy, and therefore, if such a cross member is provided, the weight of the vehicle body may become excessive. .

  The present invention has been made paying attention to the above-described circumstances, and the object of the present invention is easily achieved even when each side member constituting each side portion of the rear portion of the vehicle body is given external force from the suspension arm side. Is to improve the handling and durability of the car without tilting left and right.

  Further, another object of the present invention is to improve the above-described driving stability and durability of the automobile even when a fuel tank is disposed between the left and right side members. Even in such a case, the weight of the vehicle body should not be excessive.

According to the first aspect of the present invention, side members 9 that constitute the respective side portions of the rear portion of the vehicle body 2 and extend in the front-rear direction and support the floor panel 16 are provided, and the side members 9 are viewed in the longitudinal direction. As shown in FIG. 1, the side member main body 28 having an inverted hat shape in cross section and the floor panel 16 are provided separately from each other, and the upper end opening of the side member main body 28 is closed and coupled to the side member main body 28. The side member 9 has a midway portion 9c in the longitudinal direction so that the rear portion 9b is positioned higher than the front portion 9a of the side member 9, and the side member 9 has a midway portion 9c. A support bracket 35 that supports one end 33a of the suspension arm 33 is coupled, and the support bracket 35 connects the one end 33a of the suspension arm 33 to the width of the vehicle body 2. In rear vehicle body structure having a pair of vertical walls 36 and 37 which sandwich with,
Reinforcing members 41 respectively connected to the floor panel 16 and the vertical wall 37 of the support bracket 35 are provided,
A part of the cover plate 29 is extended toward the reinforcing member 41, and the extended portion 29 a of the cover plate 29 is coupled to the floor panel 16. The floor panel 16 and the extended portion 29 a of the cover plate 29 are connected. The vehicle body rear structure is characterized in that a closed cross-section structure part is formed by joining the parts joined together to each other , the support bracket 35, and the reinforcing member 41 to each other.

  In this section, the reference numerals appended to the above terms are not to be construed as limiting the technical scope of the present invention to the section “Example” described later or the contents of the drawings.

  The effects of the present invention are as follows.

According to the first aspect of the present invention, each side part of the rear part of the vehicle body is configured to extend in the front-rear direction, and a side member that supports the floor panel is provided. An inverted hat-shaped side member main body and a lid plate that is provided separately from the floor panel , closes the upper end opening of the side member main body and is coupled to the side member main body, and includes a front portion of the side member. The side member in the longitudinal direction of the side member is shaped to rise rearward so that the rear portion is positioned higher than the rear member, and a support bracket that supports one end portion of the suspension arm is coupled to the middle portion of the side member. In the rear body structure of an automobile provided with a pair of vertical walls that sandwich one end of the suspension arm in the width direction of the vehicle body,
Reinforcing members that are respectively coupled to the floor panel and the vertical wall of the support bracket are provided.

  For this reason, when the reinforcing material is given an external force toward the left and right which is the width direction of the vehicle body, the shear stress generated between the floor panel and the reinforcing material extending substantially horizontally strongly counters the external force, The reinforcing material is firmly supported by the vehicle body together with the support bracket.

  Therefore, even when a large external force is applied to the middle part of the side member from the suspension arm side through the support bracket during traveling of the automobile, the external force is firmly supported by the reinforcing material. For this reason, it is more reliably prevented that the midway part is tilted left and right with respect to the front part of the side member by the external force. As a result, the maneuverability and durability of the automobile can be improved.

  Further, the reinforcing member joins the floor panel and the support bracket, and is not a cross member constructed on the left and right side members. For this reason, even if a fuel tank is disposed between the left and right side members, the reinforcing member can be provided regardless of the fuel tank. Therefore, the operability and durability of the automobile can be improved regardless of the arrangement of the fuel tank described above.

  Further, the reinforcing material can be lighter than the cross member. For this reason, it is possible to prevent the weight of the vehicle body from becoming excessive even when the operability of the automobile is improved as described above.

Further, a part of the lid plate is extended toward the reinforcing member, the extension portion of the lid plate is coupled to the floor panel, and the floor panel and the extension portion of the lid plate are coupled to each other. The portion , the support bracket, and the reinforcing material are coupled to each other to form a closed cross-section structure portion.

  For this reason, the strength and rigidity of the reinforcing member can be further improved with a simple configuration by using the extending portion which is a part of the lid plate of the side member and the support bracket. Therefore, the middle part of the side member being tilted to the left and right can be more reliably prevented with a simple configuration by the above-described reinforcing material.

  The vehicle body rear structure of the present invention relates to the operability of the vehicle so that even if each side member constituting each side portion of the vehicle body rear portion is given an external force from the suspension arm side, it does not easily tilt to the left and right. In order to realize the purpose of improving the durability, the best mode for carrying out the present invention is as follows.

In other words, side members that constitute the respective side portions of the rear portion of the vehicle body and extend in the front-rear direction and support the floor panel are provided. The side member is provided separately from the side panel body of the inverted hat shape and the floor panel as viewed from the line of sight along the longitudinal direction. The side member is closed by closing the upper end opening of the side member body. A lid plate coupled to the main body. The middle part of the side member in the longitudinal direction is shaped to rise rearward so that the rear part is positioned higher than the front part of the side member, and a support bracket for supporting one end part of the suspension arm is coupled to the middle part of the side member. ing. The support bracket includes a pair of vertical walls that sandwich one end of the suspension arm in the width direction of the vehicle body. Reinforcing members that are respectively coupled to the floor panel and the vertical wall of the support bracket are provided. A part of the cover plate extends toward the reinforcing member, the extension part of the cover plate is coupled to the floor panel, and the floor panel and the extension part of the cover plate are coupled to each other. The bracket and the reinforcing material are coupled to each other to form a closed cross-section structure portion.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes an automobile, and an arrow Fr indicates the front in the traveling direction of the automobile 1. The left and right described below refer to the width direction of the vehicle body 2 of the automobile 1 toward the front.

  A rear wheel 3 is suspended from a rear portion of the vehicle body 2 by a suspension device 4, and a rear portion of the vehicle body 2 is supported on a traveling surface 5 by the rear wheel 3. The vehicle body 2 includes a vehicle body frame 7 that constitutes a lower portion of the vehicle body 2, left and right side walls 8 that constitute side portions of the vehicle body 2 and are supported by the vehicle body frame 7, and upper ends of the side walls 8. And a roof panel (not shown) installed on the edge.

  The vehicle body frame 7 includes left and right side members 9 that constitute the left and right sides and extend in the front-rear direction, respectively, and extend in the width direction of the vehicle body 2. Before and after the front end portions, the rear end portions, and the midway portions in the front-rear direction are connected to each other, and extend in the front-rear direction with the midway cross members 10 to 12. , 12 is provided with a center member 13 which is constructed by being erected between the longitudinal center portions thereof.

  Each side member 9 extends along the lower end edge of the side wall 8 and is disposed adjacent to the inner side of the lower end edge of the side wall 8 in the width direction of the vehicle body 2. It is joined to the lower edge by spot welding S1.

  A floor panel 16 extending generally in the horizontal direction is joined to and supported by the top surfaces of the members 9 to 13 by spot welding S2. A space surrounded by the left and right side walls 8, the floor panel 16 and the roof panel serves as a compartment 17 inside the vehicle body 2. A rear door opening 18 is formed in the rear side wall 8 of the vehicle body 2, and a rear side door 19 that closes the door opening 18 so as to be opened and closed is provided. The side wall 8, the members 9 to 13, and the floor panel 16 are each made of sheet metal.

  A rocker 22 extending in the front-rear direction is formed at the lower edge of the side wall 8. The rocker 22 includes an outer and inner panels 23 and 24 that face each other in the width direction of the vehicle body 2, and a reinforcing panel 25 interposed between the panels 23 and 24. Each of the upper and lower edge portions of each of the panels 23 to 25 is overlapped and spot welded S3 and S4. As a result, the rocker 22 has a closed cross-sectional structure with high strength and rigidity as viewed from the line of sight along the longitudinal direction (FIG. 1).

  The side member 9 is spotted on the side member main body 28 by closing the side member main body 28 having an inverted hat shape in cross section and the upper end opening of the side member main body 28 when viewed from the line of sight along the longitudinal direction (FIG. 1). The lid plate 29 is attached by welding S2 and S5, and has a closed cross-sectional structure with high strength and rigidity. Further, the side member main body 28 extends integrally from the U-shaped portion 30 and each upper edge of the U-shaped portion 30 as viewed from the above line of sight (see FIG. 1). And left and right outward flanges 31 for spot welding S2 and S5.

  In the side view of the automobile 1 (FIGS. 2 and 4), the side member 9 at the rear part of the vehicle body 2 has a middle part 9c in the longitudinal direction of the side member 9 so that the rear part 9b is positioned higher than the front part 9a. Is an upwardly inclined shape, that is, the midway portion 9c is a kick-up portion. The midway cross member 12 is installed on each rear part of the midway part 9 c of the left and right side members 9.

  The suspension device 4 includes a suspension arm 33 that is a trailing arm, and a support bracket 35 that supports one end portion (front end portion) 33a of the suspension arm 33 by a support shaft 34 is coupled to a midway portion 9c of the side member 9. ing. The support bracket 35 extends in a substantially horizontal direction with a pair of outer and inner vertical walls 36 and 37 sandwiching one end portion 33a of the suspension arm 33 in the width direction of the vehicle body 2, and couples the vertical walls 36 and 37 to each other. And a coupling plate 38 to be made.

  More specifically, the outer vertical wall 36 is coupled to the inner panel 24 of the rocker 22 by spot welding S6, and the upper portion of the inner vertical wall 37 is spot welded to the U-shaped portion 30 of the side member main body 28. Combined by S7. The coupling plate 38 couples the upper edge of the outer vertical wall 36 and the middle part of the inner vertical wall 37 in the vertical direction, and is coupled to the lower surface of the side member main body 28 by spot welding S8. Yes.

  Reinforcing members 41 made of sheet metal are provided to the side members 9, the floor panel 16, and the inner vertical wall 37 of the support bracket 35 by spot welding S2, S7, and S9 to S11, respectively. The reinforcing member 41 is disposed between the front cross member 10 and the midway cross member 12 in the front-rear direction. The reinforcing member 41 is disposed on the inner side in the width direction of the vehicle body 2 with respect to the middle portion 9c of the side member 9, is adjacent to the middle portion 9c of the side member 9, and is located in front of the support bracket 35. It is arranged in the vicinity.

  The reinforcing member 41 includes a U-shaped reinforcing member main body 42 that opens toward the outer side of the vehicle body 2 (on the middle part 9c side of the side member 9) in a plan view of the automobile 1 (FIG. 5), and the reinforcing member. It is formed integrally with the upper end edge of the material main body 42, and is joined to the three-layer overlapping portion of the lid plate 29, the outward flange 31 and the floor panel 16 of the side member 9 by spot welding S2, and the floor panel 16 And an upward outward flange 43 coupled by spot welding S9.

  The reinforcing member 41 is formed integrally with the rear outer edge of the front and rear outer edges of the reinforcing member main body 42 in the width direction of the vehicle body 2, so that the U-shaped portion of the side member main body 28 is formed. 30 and an intermediate flange 44 coupled to the two overlapping portions of the upper part of the inner vertical wall 37 of the support bracket 35 by spot welding S7, and the side member formed integrally with the front outer edge of the reinforcing body 42. Another halfway outward flange 45 coupled to the U-shaped portion 30 of the main body 28 by spot welding S10 and the reinforcing material main body 42 are integrally formed to close the lower end opening of the reinforcing material main body 42, and the support A bottom plate 46 coupled to the bottom plate of the U-shaped portion 30 of the side member main body 28 near the front of the bracket 35 by spot welding S11 is provided.

  A part of the lid plate 29 of the side member 9 is extended toward the reinforcing member 41. The extending portion 29a of the side member 9 covers the upper end opening of the reinforcing material body 42 of the reinforcing material 41 via the floor panel 16, and is a two-layer overlapping portion of the floor panel 16 and the upward flange 43 of the reinforcing material 41 Are coupled by spot welding S9. The side member 9, the support bracket 35, the reinforcing member 41, and the extending portion 29a of the lid plate 29 form a box-shaped closed cross-section structure portion (9, 35, 41, 29, 29a) having high strength and rigidity. Has been.

  1, 2, 4, and 5, the side door 19 is a sheet metal outer and inner panels 51, 52 that face each other in the width direction of the vehicle body 2 and are coupled to each other, and between these panels 51, 52. And an impact beam 54 supported by a bracket 53 on the inner panel 52. A box-shaped external force receiving body 56 made of sheet metal is attached to the reinforcing panel 25 of the rocker 22, and the external force receiving body 56 protrudes from the reinforcing panel 25 to the vicinity of the outer panel 23. In a side view of the automobile 1 (FIGS. 2 and 4), at least a part of each of the side member 9, the rocker 22, the reinforcing member 41, the impact beam 54, and the external force receiving body 56 is overlapped with each other.

  A fuel tank 58 is disposed in a space surrounded by the left and right side members 9, the front cross member 10, the midway cross member 12, the center member 13, and the floor panel 16. In a plan view of the automobile 1 (FIG. 3), the outward flange 59 formed on the outer peripheral edge of the fuel tank 58 is the front cross member 10, the midway cross member 12, the center member 13, and the reinforcing member 41. The bottom plate 46 is supported by a plurality (four) of fasteners 60.

  According to the above configuration, the reinforcing member 41 is provided to be coupled to the floor panel 16 and the vertical wall 37 of the support bracket 35.

  For this reason, when the reinforcing material 41 is given an external force toward the left and right, which is the width direction of the vehicle body 2, the shear stress generated between the floor panel 16 extending substantially horizontally and the reinforcing material 41 is strongly strengthened by the external force. In contrast, the reinforcing member 41 is firmly supported by the vehicle body 2 together with the support bracket 35.

  Therefore, even when a large external force is applied to the middle portion 9c of the side member 9 from the suspension arm 33 side through the support bracket 35 while the automobile 1 is traveling, the external force is firmly supported by the reinforcing member 41. Is done. For this reason, it is more reliably prevented that the midway portion 9c is tilted left and right with respect to the front portion 9a of the side member 9 by the external force. As a result, the operability and durability of the automobile 1 can be improved.

  Further, the reinforcing member 41 joins the floor panel 16 and the support bracket 35 and is not a cross member constructed on the left and right side members 9. For this reason, even if the fuel tank 58 is disposed between the left and right side members 9, the reinforcing member 41 can be provided regardless of the fuel tank 58. Therefore, the operability and durability of the automobile 1 can be improved regardless of the arrangement of the fuel tank 58 described above.

  Further, the reinforcing member 41 can be lighter than the cross member. For this reason, even when the operability of the automobile 1 is improved as described above, the weight of the vehicle body 2 is prevented from becoming excessive.

  Further, a part of the lid plate 29 is extended toward the reinforcing member 41, and the extended portion 29a of the lid plate 29, the support bracket 35, and the reinforcing member 41 are coupled to each other to form a closed cross-section structure portion. is doing.

  For this reason, the strength and rigidity of the reinforcing member 41 can be further improved with a simple configuration by using the extending portion 29a, which is a part of the lid plate 29 of the side member 9, and the support bracket 35. Therefore, the midway portion 9c of the side member 9 being tilted to the left and right is further reliably prevented by the above-described reinforcing member 41 with a simple configuration.

  Further, as described above, the reinforcing member 41 is coupled to the three-layer overlap portion of the cover plate 29 and the outward flange 31 of the side member 9 and the floor panel 16 (S2). Further, the reinforcing member 41 is coupled to the two overlapping portions of the extending portion 29a of the cover plate 29 and the floor panel 16 (S9).

  For this reason, the reinforcing member 41 is effectively reinforced with the side members 9 and the floor panel 16 with a simple configuration using the side members 9 and the floor panel 16. Therefore, the middle member 9c of the side member 9 can be prevented from being tilted left and right by the reinforcing member 41 with a simple structure.

  Further, as described above, the reinforcing member 41 is coupled to the two-layer overlapping portion of the U-shaped portion 30 of the side member 9 and the vertical wall 37 of the support bracket 35 (S7).

  For this reason, the reinforcing member 41 effectively reinforces the members 9 and 35 with a simple configuration using the side member 9 and the support bracket 35. Therefore, the middle member 9c of the side member 9 can be prevented from being tilted left and right by the reinforcing member 41 with a simple structure.

  Further, as described above, at least a part of each of the side member 9, the rocker 22, the reinforcing member 41, the impact beam 54, and the external force receiving body 56 is overlapped with each other in a side view of the automobile 1 (FIGS. 2 and 4). ing.

  For this reason, the side door 19 tends to be greatly deformed inward in the width direction of the vehicle body 2 at the time of a side collision of the automobile 1 in addition to the impact beam 54 and the use of the reinforcing material 41 and the external force receiving body. 56. Therefore, the protection of the passenger in the passenger compartment 17 is achieved with a more reliable and simple configuration.

  Further, as described above, the reinforcing member 41 is used as a support bracket for supporting the fuel tank 58 on the vehicle body frame 7. For this reason, the support structure of the fuel tank 58 can be simplified.

  Although the above is based on the illustrated example, the floor panel 16 may be directly supported by the side member 9 by overlapping the floor panel 16 and the cover plate 29 upside down. The floor panel 16 may be formed so as to close the upper end opening of the side member main body 28 of the side member 9.

It is the II sectional view taken on the line of FIG. It is a rear side view of a motor vehicle. It is a partial top view of a motor vehicle. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 5 is a plan view of what is shown in FIG. 4. It is a perspective view of what was shown in FIG.

DESCRIPTION OF SYMBOLS 1 Car 2 Car body 3 Rear wheel 4 Suspension device 7 Car body frame 8 Side wall 9 Side member 9a Front part 9b Rear part 9c Midway part 16 Floor panel 17 Car compartment 18 Door opening 19 Side door 22 Rocker 28 Side member main body 29 Cover plate 29a Extension Part 33 Suspension arm 33a One end 35 Support bracket 36 Vertical wall 37 Vertical wall 41 Reinforcement material 51 Outer panel 52 Inner panel 54 Impact beam 56 External force receiving body 58 Fuel tank 59 Outward flange 60 Fastener S Spot welding

Claims (1)

A side member that constitutes each side portion of the rear portion of the vehicle body and extends in the front-rear direction to support the floor panel is provided, and the side member has an inverted hat-shaped cross section when viewed from the line of sight along the longitudinal direction. And a lid plate that is provided separately from the floor panel , closes the upper end opening of the side member main body and is coupled to the side member main body, and the rear portion is positioned higher than the front portion of the side member. The side member in the longitudinal direction of the side member has a rearwardly raised shape, and a support bracket that supports one end portion of the suspension arm is coupled to the middle portion of the side member. The support bracket connects the one end portion of the suspension arm to the vehicle body. In the rear body structure of an automobile provided with a pair of vertical walls sandwiched in the width direction of
Reinforcing members that are respectively coupled to the floor panel and the vertical wall of the support bracket are provided,
A portion of the cover plate extending toward the reinforcing member, the extended portion of the cover plate is coupled to the floor panel, and the floor panel and the extended portion of the cover plate are coupled to each other ; A vehicle body rear structure, characterized in that a closed bracket structure portion is formed by coupling a support bracket and a reinforcing material to each other.

Images