JP4421398B2 - Rear body structure - Google Patents

Description

  The present invention relates to a rear vehicle body structure capable of improving rigidity.

Some vehicles include a closed cross section extending in the vehicle width direction including a rear panel at the rear of the vehicle body, and the left and right rear frames extending in the vehicle front-rear direction usually have a closed cross section extending along the vehicle width direction. Are spaced apart from each other. For example, in Patent Document 1, the rear frame is not shown, but the closed cross section along the vehicle width direction including the rear panel is spaced apart from the upper side of the floor panel. The rear frame joined to the lower surface of the floor panel so as to be formed is also considered to be separated from the above-described closed cross-sectional portion along the vehicle width direction.
On the other hand, in Patent Document 2, a closed cross section including the rear panel at the rear of the vehicle body and extending in the vehicle width direction is formed, and a rear frame extending in the vehicle front-rear direction is joined to the floor panel on the front side of the closed cross section. In addition, there is described a floor panel formed with a shape that extends a rear frame.
Japanese Patent Laid-Open No. 9-58521 JP-A-9-175439

However, if the closed cross-sectional portion along the vehicle width direction at the rear part of the vehicle body and the rear frame along the front-rear direction at the vehicle body side part are vertically separated as in Patent Document 1, the strength is weak between them. There arises a problem that a part is generated, and it is necessary to reinforce the part, resulting in an increase in cost and weight. That is, if reinforcement is not performed, when a force in the front-rear direction is applied to the closed cross-section portion, stress concentrates on the welded portion between the closed cross-section portion and the rear frame, causing a collapse in the front-rear direction.
Moreover, although the structure of Patent Document 2 can increase the rigidity as compared with the structure of Patent Document 1, it has not yet been sufficient.

  Accordingly, an object of the present invention is to provide a rear vehicle body structure that can ensure rigidity while reducing cost and weight.

In order to achieve the above object, the invention according to claim 1 includes a closed cross section (for example, the closed cross section 45 in the embodiment) extending in the vehicle width direction including the rear panel (for example, the rear panel 17 in the embodiment ) at the rear of the vehicle body. And forming the closed cross-section portion on the left and right rear frames (for example, the rear frame 12 in the embodiment) extending in the longitudinal direction of the vehicle body so as to connect the rear frames to each other, and at the front side of the closed cross-section portion. A rear wall portion (for example, the standing wall portion 21 in the embodiment) is formed by bending a rear end portion of a floor panel (for example, the floor panel 11 in the embodiment) disposed on the rear frame, and the standing wall portion is extended in the vehicle width direction. In the rear vehicle body structure joined to the extending closed cross section, the closed cross section extending in the vehicle width direction is a front rear panel stiffener (for example, in the embodiment). Rear panel stiffener 16) and the rear panel on the rear side, and the rear panel stiffener extends in the vehicle width direction in a substantially vertical state (for example, the lower plate portion 30 in the embodiment), Bending from the upper edge of the lower plate and extending in the vehicle width direction and protruding substantially horizontally forward (for example, the bonding plate 31 in the embodiment) and bent from the front edge of the bonding plate A front plate portion (for example, the front plate portion 32 in the embodiment) that protrudes substantially vertically upward in a state extending in the vehicle width direction, and a state in which the front plate portion bends from the upper edge of the front plate portion and extends in the vehicle width direction. In the structure having an upper plate portion (for example, the upper plate portion 33 in the embodiment) that protrudes substantially horizontally rearward and a flange portion (for example, the flange portion 34 in the embodiment) that protrudes from the rear edge of the upper plate portion. Yes, the rear frame has a rear end at the front It is joined to the lower plate part of the rear panel stiffener, and the upper surface is joined to the joining plate part of the rear panel stiffener, and the rear panel extends in the vehicle width direction in a substantially vertical state (for example, implementation) A lower plate portion 37) in the form, an intermediate plate portion that is bent from the upper edge of the lower plate portion and extends in the vehicle width direction and protrudes substantially horizontally rearward (for example, the intermediate plate portion 38 in the embodiment), A rear plate portion (for example, the rear plate portion 39 in the embodiment) that is bent from the rear end edge portion of the intermediate plate portion and extends substantially vertically upward while extending in the vehicle width direction, and an upper end edge portion of the rear plate portion The lower plate portion of the rear panel is joined to the lower plate portion of the rear panel stiffener (for example, in the embodiment). under A closed cross-sectional portion extending in the vehicle width direction, having a joint portion 42) and an upper non-contact portion (for example, the upper non-contact portion 43 in the embodiment) that does not contact the lower plate portion of the rear panel stiffener Is formed by joining the flange portion of the rear panel stiffener and the flange portion of the rear panel on the one hand and joining the lower plate portion of the rear panel stiffener and the lower joint portion of the rear panel on the other hand. It is characterized by.

  According to the first aspect of the present invention, the closed cross section including the rear panel at the rear of the vehicle body and extending in the vehicle width direction is disposed on the left and right rear frames extending in the vehicle front-rear direction so as to connect the rear frames. Therefore, the vehicle body rigidity can be ensured without special reinforcement as in the case where the closed cross section and the rear frame are separated from each other in the vertical direction. Therefore, it is possible to ensure rigidity while reducing cost and weight. In addition, the standing wall of the rear end of the floor panel disposed on the rear frame in front of the closed cross section is joined to the closed cross section, and the rear frame and the closed cross section are also connected by the floor panel. Can be made. Therefore, the vehicle body rigidity can be further improved.

  A rear vehicle body structure according to an embodiment of the present invention will be described below with reference to the drawings. Note that the front, rear, left and right used in the following description are front, rear, left and right in the vehicle body.

  FIG. 1 is a perspective view showing a rear vehicle body structure of the present embodiment as viewed obliquely from the front. A floor panel 11 is disposed substantially horizontally as a whole, and rear frames 12 are arranged on the lower left and right sides of the floor panel 11 in front and rear of the vehicle body. It extends along the direction (only one rear frame 12 is shown).

  Here, the floor panel 11 is formed with a storage recess 13 for storing a spare tire or the like at the center in the rear in the vehicle width direction so as to be recessed downward, and rear frames 12 are provided on the left and right sides of the storage recess 13. It has been.

  Further, a rear panel stiffener 16 that forms the lower end edge side of the tailgate opening 15 extends in the vehicle width direction on the rear side of the floor panel 11, and the rear side of the rear panel stiffener 16 is shown in FIG. As shown, a rear panel 17 at the rear of the vehicle body that forms the lower edge of the tailgate opening 15 extends in the vehicle width direction.

  As shown in FIGS. 2 and 3, the rear portion of the floor panel 11 has a main plate portion 20 that is disposed substantially horizontally as a whole, and a standing wall portion that is bent from the rear end edge portion of the main plate portion 20 and protrudes substantially vertically upward. 21.

  The rear part of the rear frame 12 has a bottom plate part 24 extending in the longitudinal direction of the vehicle body in a substantially horizontal posture, and a side plate that bends from the left and right side edges of the bottom plate part 24 and rises vertically upward in a state of extending in the longitudinal direction of the vehicle body Part 25, a pair of upper flange parts 26 that are bent in a direction away from the upper edge of each side plate part 25 and extend in the longitudinal direction of the vehicle body, and substantially horizontally, and the rear edge part of each side plate part 25 From the pair of rear flanges 27 along the vehicle width direction and the rear edge of the bottom plate part 24 in a state of being bent away from each other and extending in a substantially vertical direction and extending substantially vertically. In the state, it has a so-called hat-shaped cross-sectional shape having a lower flange portion 28 substantially along the vehicle width direction.

  The rear panel stiffener 16 protrudes substantially horizontally forward in a state in which the rear plate portion 30 extends in the vehicle width direction in a substantially vertical state and is bent from the upper edge of the lower plate portion 30 and extends in the vehicle width direction. The joining plate portion 31, the front plate portion 32 that is bent from the front end edge portion of the joining plate portion 31 and extends in the vehicle width direction and protrudes substantially vertically upward, and the vehicle is bent from the upper end edge portion of the front plate portion 32. An upper plate portion 33 projecting substantially horizontally rearward in a state extending in the width direction, and slightly rearwardly rising from a rear end edge portion of the upper plate portion 33 and extending in the vehicle width direction. And a flange portion 34. The rear panel stiffener 16 is longer than the width of the left and right rear frames 12 on the outer side in the vehicle width direction.

  The rear panel 17 has a lower plate portion 37 extending in the vehicle width direction in a substantially vertical state, and an intermediate portion that is bent from the upper edge of the lower plate portion 37 and extends in the vehicle width direction and protrudes substantially horizontally rearward. A plate 38, a rear plate 39 that bends from the rear edge of the intermediate plate 38 and extends in the vehicle width direction and protrudes substantially vertically upward, and is bent from the upper edge of the rear plate 39. And a flange portion 40 that protrudes rearward in a state of extending in the width direction.

  When these are joined, the floor panel 11 places the main plate portion 20 on the lower surface 20a at a front position excluding a predetermined range on the rear end side of the upper surface 26a of the upper flange portions 26 of the left and right rear frames 12. In this state, the rear panel stiffener 16 is joined to a predetermined range on the rear end side of the upper surfaces 26a of all the upper flange portions 26 of the left and right rear frames 12 in this state. It is placed on the lower surface 31 a of the part 31.

  Then, the front surface 32 a of the front plate portion 32 of the rear panel stiffener 16 is brought into contact with the rear surface 21 a of the standing wall portion 21 of the floor panel 11, and the front surface 30 a of the lower plate portion 30 of the rear panel stiffener 16 is connected to all rear portions of both rear frames 12. The front plate portion 32 of the rear panel stiffener 16 is joined to the standing wall portion 21 of the floor panel 11 by welding in a state where the rear surface 27a of the flange portion 27 and the rear surface 28a of the lower flange portion 28 are in contact (a welding point is indicated by X1). ) And the joining plate portion 31 of the rear panel stiffener 16 are joined to all the upper flange portions 26 of both rear frames 12 by welding (welding points are indicated by X2).

Next, the flange portion 40 of the rear panel 17 is brought into contact with the lower surface 34a of the flange portion 34 of the rear panel stiffener 16 at the upper surface 40a. The flange portion 34 and the flange portion 40 are joined by welding in a state where the joint portion 42 is in contact with the front surface 42a (a welding point is indicated by X3), and the lower joint portion 42 and the lower plate portion of the lower plate portion 37 are joined. 30 and all the rear flange portions 27 of the rear frames 12 are joined by welding (the welding point is indicated by X4), and further, the lower joint portion 42 of the lower plate portion 37, the lower plate portion 30, and the lower portions of the rear frames 12 The flange portion 28 is joined by welding (a welding point is indicated by X5). Here, the portion excluding the lower joint portion 42 of the lower plate portion 37 of the rear panel 17, that is, the portion that does not contact the lower plate portion 30 of the rear panel stiffener 16 becomes the upper non-contact portion 43.

When joined as described above, a closed cross-section portion 45 extending in the vehicle width direction including the upper portion of the rear panel 17 at the rear of the vehicle body and the rear panel stiffener 16 is formed. Here, the closed cross-section portion 45 is a portion that substantially surrounds the inner space 46 in the rear panel 17 and the rear panel stiffener 16, and specifically excludes the flange portion 34 and the lower plate portion 30 of the rear panel stiffener 16. The upper non-contact portion 43 of the lower plate portion 37, except for the bonding plate portion 31, the front plate portion 32 and the upper plate portion 33, and the flange portion 40 of the rear panel 17 and the lower bonding portion 42 of the lower plate portion 37. This is a portion composed of a plate portion 38 and a rear plate portion 39.

  Then, the joint section 31 of the rear panel stiffener 16 that forms the closed section 45 as described above is joined to the upper surfaces 26a of all the upper flange sections 26 of the left and right rear frames 12, thereby extending the closed section extending in the vehicle width direction. The portion 45 is joined to the upper surface 26a of the upper flange portion 26 of the left and right rear frames 12 so as to connect the left and right rear frames 12 to each other.

  Further, the standing wall portion 21 at the rear end portion of the floor panel 11 joined to the upper surface 26 a of the upper flange portion 26 of the rear frame 12 on the front side of the closed cross-section portion 45 is formed on the front surface 32 a of the front plate portion 32 of the closed cross-section portion 45. Will be joined.

  Here, both the rear frames 12 form a closed cross-sectional portion 48 extending in the front-rear direction with the floor panel 11 except for the rear end portion, and the rear end portion is the above-described joint plate portion 31 of the rear panel stiffener 16. The closed cross section 48 thus extended is further extended to the rear end position. That is, the closed cross-section portion 45 extending in the vehicle width direction and the closed cross-section portion 48 extending in the front-rear direction overlap each other.

  According to the present embodiment configured as described above, the closed cross section 45 extending in the vehicle width direction including the upper portion of the rear panel 17 at the rear of the vehicle body is placed on the left and right rear frames 12 extending in the vehicle longitudinal direction. Therefore, the vehicle body rigidity can be ensured without special reinforcement as in the case where the closed cross section 45 and the rear frame 12 are spaced apart from each other in the vertical direction. Therefore, it is possible to ensure rigidity while reducing cost and weight.

  Further, the standing wall portion 21 at the rear end portion of the floor panel 11 disposed on the rear frame 12 in front of the closed cross-section portion 45 is joined to the front surface 32 a of the closed cross-section portion 45. That is, the rear panel 12 and the front surface 32a of the closed cross section 45 can be connected by the floor panel 11. Therefore, the vehicle body rigidity can be further improved.

  That is, when a force is applied to the closed cross-section portion 45 along the vehicle width direction later, rigidity in a direction to counter this force mainly at a portion where the closed cross-section portion 45 and the rear frame 12 are welded to overlap each other. In addition, when a force is applied to the closed cross-section portion 45 from the front, the force is mainly applied to a portion where the closed cross-section portion 45 and the standing wall portion 21 of the floor panel 11 are overlapped and welded. The rigidity in the opposing direction will be increased. Furthermore, since the closed cross-section portion 45 along the vehicle width direction overlaps with the closed cross-section portion 48 along the front-rear direction, the rigidity is increased even with respect to the force in the vertical direction of the closed cross-section portion 45 along the vehicle width direction. .

  Further, since the front plate portion 32 at the front end of the rear panel stiffener 16 is joined to the standing wall portion 21 of the floor panel 11, the upper portion of the standing wall portion 21 is not covered with the rear panel stiffener 16. The applicability of the dust sealer in the gap between them can be improved.

  Furthermore, it is possible to increase the size of the closed cross-section 45 of the corner portion of the tailgate opening 15 and to improve the rigidity of the tailgate opening 15 as a whole.

It is a perspective view which shows the rear part vehicle body structure of one Embodiment of this invention. It is a disassembled perspective view which shows the principal part of the rear part vehicle body structure of one Embodiment of this invention. FIG. 2 is a cross-sectional arrow view taken along the line AA in FIG. FIG. 4 is a cross-sectional arrow view taken along the line BB in FIG.

Explanation of symbols

11 Floor panel 12 Rear frame 17 Rear panel 21 Standing wall portion 26a Upper surface 32a Front surface 45 Closed section

Claims (1)

Include vehicle rear body of the rear panel (17) forming a closed cross-section portion (45) extending in the vehicle width direction, these rear frame on the left and right rear frames (12) extending the closed cross-section portion (45) in the longitudinal direction of the vehicle body (12) The wall portion is arranged so as to tie each other, and the rear end portion of the floor panel (11) disposed on the rear frame (12) is bent in front of the closed cross-section portion (45) to stand the standing wall portion. In the rear vehicle body structure that forms (21) and joins the standing wall (21) to the closed cross section (45) extending in the vehicle width direction ,
The closed cross section (45) extending in the vehicle width direction includes a front rear panel stiffener (16) and a rear rear panel (17).
The rear panel stiffener (16) extends in the vehicle width direction by bending from the lower plate portion (30) extending in the vehicle width direction in a substantially vertical state and the upper edge of the lower plate portion (30). A joining plate portion (31) projecting substantially horizontally forward in the state, and a front plate portion (32) projecting substantially vertically upward in a state of bending from the front end edge of the joining plate portion (31) and extending in the vehicle width direction. ), An upper plate portion (33) that is bent from the upper edge of the front plate portion (32) and extends in the vehicle width direction and protrudes substantially horizontally rearward, and a rear end of the upper plate portion (33) A flange portion (34) protruding from the edge portion,
The rear frame (12) has a rear end joined to the lower plate portion (30) of the rear panel stiffener (16) and an upper surface joined to the joining plate portion (31) of the rear panel stiffener (16). ,
The rear panel (17) has a lower plate portion (37) extending in the vehicle width direction in a substantially vertical state, and a state in which the rear panel (17) is bent from the upper edge portion of the lower plate portion (37) and extends in the vehicle width direction. And an intermediate plate portion (38) protruding substantially horizontally rearward and a rear plate portion (39) protruding substantially vertically upward in a state of being bent from the rear edge of the intermediate plate portion (38) and extending in the vehicle width direction. And a flange portion (40) protruding from the upper edge of the rear plate portion (39),
The lower plate portion (37) of the rear panel (17) includes a lower joint portion (42) joined to the lower plate portion (30) of the rear panel stiffener (16) and the lower plate of the rear panel stiffener (16). An upper non-contact portion (43) that does not contact the portion (30),
The closed cross section (45) extending in the vehicle width direction is joined to the flange (34) of the rear panel stiffener (16) on the one hand and the flange (40) of the rear panel (17) on the other. A rear vehicle body structure formed by joining the lower plate portion (30) of the rear panel stiffener (16) and the lower joint portion (42) of the rear panel (17) .

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