JP5535698B2 - Rear body structure of automobile - Google Patents

Description

  The present invention relates to a rear vehicle body structure including a lower back panel that forms a lower edge portion of a back door opening of a vehicle, a rear pillar that forms a side edge portion, and a corner member that forms a lower corner edge portion.

  As a rear vehicle body structure of this type, a structure is employed that increases the rigidity against external force at the lower corner portion of the back door opening. For example, Patent Document 1 proposes a structure in which a convex coupling reinforcing portion is provided on an inner panel of a lower back panel, and the coupling reinforcing portion is coupled to a lower corner portion of a rear pillar. Patent Document 2 proposes a structure in which a pillar rein hose disposed in a rear pillar is extended downward, and this extended portion is coupled to a lower corner portion of the rear pillar and the lower back panel.

  Further, in an automobile, in order to efficiently transmit the input at the time of a vehicle collision to the rear part of the vehicle body, the rear end part of the side member extending in the vehicle front-rear direction may be coupled to the inner panel of the corner member.

JP 2006-62565 A JP-A-8-104258

  By the way, in the said patent document 1, since reinforcement of the lower corner part by a joint reinforcement part is partial, there exists a problem that the rigidity of the whole lower side corner part of a back door opening is hard to be obtained.

  Moreover, in the said patent document 2, there exists a problem that a vehicle body weight and a number of parts increase by the part which provides the pillar rein hose.

  Further, when the rear end portion of the conventional side member is coupled to the inner panel of the corner member, the input from the side member is likely to be received only by the inner panel. Therefore, it is necessary to increase the rigidity by increasing the thickness of the inner panel or adding a bulkhead or the like, and there is a problem that the weight of the vehicle body and the number of parts increase.

  The present invention has been made in view of the above-described conventional situation, and can increase the rigidity of the entire lower corner portion of the back door opening without increasing the weight of the vehicle body and the number of parts, and can also input the input from the side member. An object of the present invention is to provide a rear vehicle body structure that can be reliably transmitted from a panel to an outer panel.

The present invention includes a lower back panel having a closed cross-sectional structure that extends in the vehicle width direction and forms a lower edge portion of a back door opening formed at a rear end portion of the vehicle, and extends in the vehicle up-down direction. A rear part of an automobile comprising a rear pillar having a closed cross-sectional structure forming an edge and a corner member forming a corner edge of the back door opening, and a rear end of a side member extending in the vehicle front-rear direction coupled to the corner member A vehicle body structure,
The corner member has a closed cross section formed so that the inner member and the outer member have a closed cross section, the closed cross section is continuous with the closed cross sections of the lower back panel and the rear pillar, and has a curved shape. And an overlapping portion formed by overlapping extensions extending downward following the closed cross-sectional portion of the inner member and the outer member,
The left and right flange portions and the lower flange portion are bent outward at the rear end of the side member, the right flange portion and the lower flange portion are coupled to the overlapping portion, and the left flange portion is the closed cross-section portion. It is characterized by being coupled to .

  According to the rear vehicle body structure according to the present invention, the inner member and the outer member of the corner member form a closed cross section, and the closed cross section forms a superposed portion that is continuous with the closed cross sections of the lower back panel and the rear pillar. The rigidity of the entire lower corner of the back door opening can be increased without increasing the vehicle weight or the number of parts.

Further, an overlapped portion is formed by overlapping the extended portions of the inner member and the outer member, a right flange portion and a lower flange portion of a side member are joined to the overlapped portion, and a left flange portion is connected to the closed cross-section portion. Since they are coupled, the rigidity of the lower corner portion can be further enhanced, and the input from the side member at the time of a vehicle collision can be reliably transmitted from the inner member to the outer member and received by both members. As a result, the problems of increasing the thickness of the inner member and adding a bulkhead can be avoided, and the weight of the vehicle body and the number of parts can be reduced.

1 is a perspective view of a rear body structure of an automobile according to Embodiment 1 of the present invention. It is a perspective view of the said rear body structure. FIG. 6 is a rear view of the rear vehicle body structure. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 3) of the said rear vehicle body structure. It is sectional drawing (VV sectional view taken on the line of FIG. 3) of the said rear vehicle body structure. It is sectional drawing (VI-VI sectional view taken on the line of FIG. 3) of the said rear vehicle body structure. It is sectional drawing (VII-VII sectional view taken on the line of FIG. 3) of the said rear vehicle body structure. It is sectional drawing (the VIII-VIII sectional view taken on the line of FIG. 3) of the said rear vehicle body structure. It is a perspective view of the said vehicle body structure.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 9 are views for explaining a rear body structure of an automobile according to a first embodiment of the present invention. In the description of this embodiment, front and rear and left and right mean front and rear and left and right when viewed from the rear of the vehicle, unless otherwise specified.

  In the figure, reference numeral 1 denotes a rear body of an automobile, which includes left and right rear side panels 2 and 2, a roof panel 3 disposed between upper ends of the left and right rear side panels 2, and the left A vehicle compartment is formed with the floor panel 4 disposed between the lower ends of the right rear side panel 2.

  A back door opening 1a is formed on the rear end surface of the rear vehicle body 1 so as to spread over substantially the entire area thereof. A back door 5 is disposed in the back door opening 1a so as to be openable and closable.

  The back door opening 1a includes a lower back panel 8 that forms a lower edge 1b of the back door opening 1a, rear pillars 9 and 9 that form left and right edges 1c and 1c, and left and right corner edges. The corner members 10 and 10 forming the portions 1d and 1d are formed. The upper edge portion of the back door opening 1a is formed by an upper back panel (not shown) connected to the roof panel 3.

  The lower back panel 8 has a structure in which a lower back outer 8a and a lower back inner 8b are coupled so as to form a closed section a having a generally rectangular tube shape extending in the vehicle width direction.

Specifically, a box-shaped closed cross section a is formed by joining the upper coupling portions 8c, 8c and the lower coupling portions 8d, 8d of the lower back outer 8a and the lower back inner 8b by welding. The upper coupling portion 8c forms a lower edge portion 1b of the back door opening 1a.

  A lock striker 12 is attached to the center of the lower back outer 8a in the vehicle width direction, and a door latch 13 that is detachably engaged with the lock striker 12 is attached to the back door 5.

  The lower back inner 8b is formed with an extension 88e extending downward following the lower coupling portion 8d. The rear edge 4a of the floor panel 4 is coupled to the extension 8e (see FIG. 4). A rear bumper 14 extending in the vehicle width direction is attached to the extension 8e of the lower back inner 8b.

  The left and right rear pillars 9 have a structure in which a pillar outer 9a and a pillar inner 9b are coupled so as to form a rectangular tube-shaped closed cross section b extending in the vehicle vertical direction, and the basic structure is substantially the same as that of the lower back panel 8. It is the same.

  A recess 9c is formed in the pillar outer 9a of the left and right rear pillars 9 so as to extend in the vertical direction, and rear combination lamps 15 and 15 having a length almost extending over the entire length of the rear pillar 9 are disposed in the recess 9c. Yes.

  The corner member 10 has a structure in which an outer member 19 and an inner member 20 are coupled so as to form a closed section c and an overlapping portion 10 '.

  Specifically, the closed cross-section portion c has a box-shaped closed cross section by welding the outer joint portion 19 and the inner member 20 to the rear coupling portions 19a and 20a and the front coupling portions 19b and 20b by welding. ing. Further, the closed section c of the corner member 10 is configured so that the closed section a of the lower back panel is continuous with the closed section b of the rear pillar 9. Thereby, the lower side corner portion of the back door opening 1a has a continuous box-like closed cross-sectional structure. The rear coupling portions 19a and 20a form a corner edge 1d of the back door opening 1a.

  The overlapping portion 10 'forms extension portions 20c and 19c extending downward following the front side joining portions 20b and 19b of the inner member 20 and the outer member 19, and the extension portions 20c and 19c are overlapped in the vehicle front-rear direction. Have a combined structure. Here, the extension 20c of the inner member 20 is set for attaching the rear bumper 14 and the like, and has substantially the same length as the extension 8e of the lower back inner 8b. On the other hand, the extension portion 19c of the outer member 19 is set to a minimum length necessary for coupling a side member 17 described later.

  In the joint portion of the corner member 10 with the rear pillar 9, the extension portion 19 c of the outer member 19 extends laterally in the vehicle width direction, and the side extension portion includes a recess portion continuous with the recess portion 9 c of the rear pillar 9. 19d is formed, and the lower portion of the rear combination lamp 15 is disposed in the recess 19d (see FIG. 8).

  The rear vehicle body 1 includes left and right side members 17 and 17 extending in the vehicle front-rear direction. The left and right side members 17 have a generally cross-sectional hat shape that opens upward, and are coupled to the lower surface of the floor panel 4.

  At the rear ends of the left and right side members 17, a left flange portion 17a, a right flange portion 17a ', and a lower flange portion 17b are bent outward.

  At least a part of the left and right flange portions 17a, 17a ′ and the lower flange portion 17b of the side member 17 is in contact with a portion of the overlapping portion 10 ′ of the corner member 10 in the vicinity of the closed cross-section portion c, and Three overlapping layers are joined to the overlapping portion 10 'by welding. Specifically, when viewed from the rear of the vehicle, the left flange portion 17a is coupled to a portion facing the closed section c of the inner member 20, and the right flange portion 17a 'and the lower flange portion 17b are coupled to the overlapping portion 10'. .

  Further, the rear edge 4a of the floor panel 4 is joined to the overlapping portion 10 'by welding (see FIG. 5). Further, a rear bumper 14 and left and right rear combination lamps 15 are attached to the overlapping portion 10 'by clips, bolts (not shown) and the like, and vehicle body components such as garnish and harness not shown are further attached. ing.

  According to this embodiment, the corner member 10 is formed so that the inner member 20 and the outer member 19 form a closed cross section c, and the closed cross section c closes the closed cross section a of the lower back panel 8 and the rear pillar 9. Since it is formed so as to be continuous with the cross section b, the rigidity of the entire lower side corner portion of the back door opening 1a can be increased without increasing the vehicle body weight or the number of parts.

  In this embodiment, the overlapping portions 10c of the inner member 20 and the outer member 19 are overlapped with each other to form the overlapping portion 10 ', and the overlapping portion 10' has the right flange portion 17a 'of the side member 17 and the lower part. Since the flange portion 17b is coupled and the left flange portion 17a is coupled to the closed cross-section portion c, the rigidity of the lower side corner portion can be further increased, and input at the time of a vehicle collision can be input from the side member 17 to the inner member 20. , Can be efficiently transmitted to both outer members 19. As a result, it is not necessary to increase the thickness of the inner member or add a bulkhead, thereby reducing the weight of the vehicle body and the number of parts. Incidentally, in this embodiment, the thickness of the inner member 20 of the corner member 10 can be gauged down from the conventional 1 mm to 0.7 mm, thereby reducing the weight by about 1 kg.

  Further, since the exterior parts such as the rear bumper 14 and the rear combination lamp 15 are attached to the overlapping portion 10 'and the vehicle body components such as the harness are attached, various parts are concentrated on the overlapping portion 10' having high strength and rigidity. Can be attached.

DESCRIPTION OF SYMBOLS 1 Rear vehicle body 1a Back door opening 1b Lower edge part 1c Side edge part 1d Corner edge part 8 Lower back panel 9 Rear pillar 10 Corner member 10 'Overlapping part 17 Side member 17a, 17a', 17b Flange part (rear end part)
19 Outer member 19c Extension part 20 Inner member 20c Extension part a Closed section b of lower back panel Closed section c of rear pillar c Closed section of corner member

Claims (1)

A lower back panel having a closed cross-sectional structure that extends in the vehicle width direction and forms the lower edge of the back door opening formed at the rear end of the vehicle, and the side edge of the back door opening that extends in the vehicle vertical direction The rear vehicle body structure includes a rear pillar having a closed cross-sectional structure and a corner member forming a corner edge of the back door opening, and a rear end portion of a side member extending in the vehicle front-rear direction is coupled to the corner member. And
The corner member has a closed cross section formed so that the inner member and the outer member have a closed cross section, the closed cross section is continuous with the closed cross sections of the lower back panel and the rear pillar, and has a curved shape. And an overlapping portion formed by overlapping extensions extending downward following the closed cross-sectional portion of the inner member and the outer member,
At the rear end of the side member, left and right flange parts and a lower flange part are bent outward,
The rear body structure of an automobile , wherein the right flange portion and the lower flange portion are coupled to the overlapping portion, and the left flange portion is coupled to the closed cross section .

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