JP2014162272A - Vehicle body rear part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle body rear part structure capable of promoting expansion of an opening part for a back door by achieving both high rigidity and productivity in corners of the opening part for the back door.SOLUTION: A vehicle body rear part structure 100 includes an opening part 100a for a back door, and also includes: front side corner panels (rear wheel house end panels) each constituting a corner 100b between a side edge and a lower edge of the opening part; cabin inner face panels (rear floor panels and rear wheel house inner panels) each joined to the vehicle front side of the front side corner panel, and facing a cabin space; a rear side corner panel (a tail end member) overlapping on the front side corner panels from behind a vehicle; and reinforcement members (tail end member reinforcements) mounted to the vehicle front side of the rear side corner panel in positions in which the reinforcement members overlap on junction points between the cabin inner face panels and the front side corner panels viewing from the rear side of the vehicle.

Description

  The present invention relates to a vehicle body rear structure including a back door opening to which a back door is attached.

  At the rear of the vehicle body, there is provided a back door opening (hereinafter simply referred to as an opening) for installing a back door for enabling loading / unloading of luggage into / from the luggage compartment provided there. The peripheral edge of the opening is configured by joining a member (vertical member) extending in the vehicle height direction and a member (lateral member) extending in the vehicle width direction. For example, in Patent Document 1, an edge around the opening is configured by two rear quarter inner panels respectively disposed on both sides of the rear of the vehicle body and a lower back laid between the lower portions thereof.

JP-A-8-295265

  When loading / unloading a baggage into / from the cargo compartment at the rear of the vehicle body, the wider opening is easier to use. Therefore, improvements are being made every day to widen the opening. In order to widen the opening, it is effective to narrow the width of the member (lateral member) constituting the lower edge in the vehicle height direction (lower the height).

  Here, the corners of the lower edge and the side edge, in particular, the lower corner, among the edges around the opening, are heavily loaded by the force applied in the direction of twisting the vehicle body when traveling the vehicle. It is necessary to ensure high rigidity (hereinafter referred to as vehicle body torsional rigidity). In general, as a method for improving rigidity, it is effective to set a reinforcing member (also called reinforcement) at a location where rigidity is required, and to form a closed section between the reinforcing member and the member to be reinforced It is. For this reason, conventionally, a reinforcing member is attached in the vicinity of the corner of the edge around the opening, and a closed cross section is formed by the reinforcing member and the member constituting the corner, thereby improving the rigidity.

  If the opening is not so wide as in the prior art, the member constituting the corner is large. Therefore, even if a certain amount of space (hereinafter referred to as a welding region) is spent on joining (welding) the member constituting the corner and the member disposed on the vehicle front side, a reinforcing member is further added to the member constituting the corner. It was possible to secure a sufficient space for mounting. However, if the opening is widened as described above, the members constituting the corner are naturally narrowed. For this reason, most of the members constituting the corner are consumed in the welding region, making it difficult to secure a space for attaching the reinforcing member, and the reinforcing member cannot be attached and sufficient rigidity cannot be obtained. End up. On the other hand, if the reinforcing member is provided, it is difficult to secure the welding region, which causes inconveniences in production and in production. At present, this has been a factor that hinders the expansion of the opening for the back door.

  In view of such problems, the present invention provides a vehicle body rear structure capable of achieving both high rigidity and productivity at the corner of the back door opening and promoting the expansion of the back door opening. It is an object.

  In order to solve the above problems, a typical configuration of a vehicle body rear structure according to the present invention is a vehicle body rear structure including a back door opening at a vehicle rear portion, and includes a side edge and a lower edge of the opening. A front corner panel that forms a corner between the front corner panel, a vehicle interior panel that is joined to the vehicle front side of the front corner panel and faces the vehicle interior space, a rear corner panel that overlaps the front corner panel from the rear of the vehicle, and a rear view And a reinforcing member attached to the vehicle front side of the rear corner panel at a position overlapping the junction of the vehicle interior panel and the front corner panel, and the corner is closed by the front corner panel and the rear corner panel. A cross section and a closed cross section by the front corner panel and the reinforcing member are formed.

  In the above configuration, the reinforcing member is attached to the rear corner panel that is separate from the front corner panel that constitutes the corner. Thus, after the vehicle interior panel and the front corner panel are joined, the rear panel is attached to the front corner panel so that the reinforcing panel is disposed at the corner of the opening, and the vehicle interior surface as viewed from the rear of the vehicle. A closed cross section is formed at a position (region) that overlaps the junction between the panel and the front corner panel. Since the reinforcing member can be arranged at a position overlapping the joint point in this way, the rigidity of the lower corner of the opening can be increased even if the space for arranging the reinforcing member is eliminated by the joint point. Therefore, it is possible to ensure high rigidity at the corners while satisfying the workability at the time of welding and thus the productivity, and to enlarge the back door opening.

  The area of the closed cross section formed at the corner may be larger than the area of the closed cross section formed at the side edge or the lower edge. Thereby, the rigidity (body torsional rigidity) higher than that of the side edge and the lower edge can be obtained at the corner, and the opening can be suitably reinforced.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body rear part structure which can make high rigidity and productivity compatible in the corner of the opening part for backdoors, and can accelerate | stimulate the expansion of the opening part for backdoors can be provided.

It is a figure explaining the vehicle body rear part structure concerning this embodiment. It is the elements on larger scale of FIG. It is a perspective view of the vehicle body rear part structure concerning this embodiment. It is the figure which observed the tail end member from the vehicle front side. It is the elements on larger scale of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram illustrating a vehicle body rear structure 100 according to the present embodiment. As shown in FIG. 1, the vehicle body rear structure 100 of the present embodiment is provided with a back door opening 100a to which a back door (not shown) is attached. The peripheral edge of the opening 100a includes a roof panel 102 serving as an upper edge, and a back panel 110 formed by joining a rear wheel house end panel 112 and a rear skirt panel 114, which are lower edges and will be described later. The lamp housings 104a and 104b are joined by left and right side edges.

  FIG. 2 is a partially enlarged view of FIG. FIG. 3 is a perspective view of the vehicle body rear structure 100 according to the present embodiment, and is a perspective view of the right corner 100b of the vehicle body rear structure 100 observed from the front left side of the vehicle. For ease of understanding, FIG. 2 shows a state in which the tail end member 130 and the tail end member reinforcement 140b are removed and a rear wheel house end panel 112 described later is allowed to pass through. The outline is illustrated by a two-dot chain line. 3A shows the AA cross section shown in FIG. 1, and FIG. 3B shows the BB cross section shown in FIG. In addition, since the two lower corners of the vehicle body rear structure 100 have a bilaterally symmetric configuration, the right corner 100b will be described as an example in the present embodiment.

  As shown in FIG. 3A, in the present embodiment, a vehicle compartment of the corner 100b is provided between the side edge and the lower edge of the opening 100a, that is, in the corner 100b below the edge around the opening 100a. A rear wheel house end panel 112 which is a front corner panel constituting the inner surface is disposed. A rear floor panel 122 and a rear wheel house inner panel 124 are arranged on the vehicle front side of the rear wheel house end panel 112 as vehicle interior panels that face the vehicle interior space and constitute the interior of the vehicle interior. The rear floor panel 122 is a member that becomes a floor surface at the rear of the vehicle body, and the rear wheel house inner panel 124 is a member that is disposed outside the rear floor panel 122 and constitutes a wheel house for a rear tire (both not shown).

  As shown in FIG. 3A, the rear floor panel 122 and the rear wheel house inner panel 124 have their rear ends joined to the vehicle front side surface of the rear wheel house end panel 112 by welding. Further, as shown in FIG. 2, a rear floor side member 126 extending in the vehicle front-rear direction below the rear floor panel 122 and a rear shock absorber (not shown) as a suspension member are provided on the front surface of the rear wheel house end panel 112. The rear shock absorber inside brackets 128 that support the joints are joined by welding at flanges provided at the rear ends thereof.

  Each member described above is welded (joined) to the vehicle front side surface of the rear wheel house end panel 112 at the position of black spot (joint point) shown in FIG. As described above, since junction points (welding points) are present in a large area of the rear wheel house end panel 112, a member for reinforcing the corner 100b of the opening 100a is provided on the rear wheel house end panel 112, that is, the vehicle body side. There is almost no space left for installation. For this reason, it is difficult to form a closed cross section by attaching a reinforcing member to the vehicle body as in the prior art, and if it is attempted to form a closed cross section by attaching a reinforcing member to the vehicle body side, It is difficult to secure the area.

  Therefore, in the present embodiment, a reinforcing member is provided on the rear corner panel that overlaps the front corner panel (the rear wheel house end panel 112 in the present embodiment) from the rear of the vehicle. Specifically, the vehicle body rear structure 100 of the present embodiment includes a tail end member 130 attached to the rear wheel house end panel 112 (see FIG. 3) from the rear of the vehicle, as shown in FIG. The tail end member 130 extends in the vehicle width direction, and has a left corner portion 134a and a right corner portion 134b on both sides of a center portion 132 located at the center in the vehicle width direction. The left corner portion 134a and the right corner portion 134b function as a rear corner panel that overlaps the rear wheel house end panel 112 (front corner panel) from the rear of the vehicle.

  FIG. 4 is a view of the tail end member 130 observed from the front side of the vehicle. As shown in FIG. 4, a rear skirt panel 114 that constitutes the back panel 110 together with the rear wheel house end panel 112 described above is attached to the vehicle front side of the center portion 132 of the tail end member 130. As a feature of the vehicle body rear structure 100 of the present embodiment, a rear wheel house end panel 112, a rear floor panel 122, and a rear wheel house inner panel are seen on the vehicle front side of the left corner portion 134a and the right corner portion 134b as viewed from the rear of the vehicle. Tail end member reinforcements 140a and 140b are attached as reinforcing members at positions overlapping the joint points with 124 and the like.

  FIG. 5 is a partially enlarged view of FIG. 1. For ease of understanding, FIG. 5 shows a state in which the tail end member 130 is not shown and the tail end member reinforcement 140 b is allowed to pass through. The outline of the member reinforcement 140b is illustrated by a two-dot chain line. In addition, the junction points (black dots) of the rear wheel house end panel 112, the rear floor panel 122, the rear wheel house inner panel 124, and the like shown in FIG.

  After the rear floor panel 122, the rear wheel house inner panel 124, etc. (see FIG. 3) are welded to the vehicle front side surface of the rear wheel house end panel 112, the rear skirt panel 114 and the tail end member reinforcements 140a and 140b (FIG. 4). The tail end member 130 to which the reference is attached) is joined to the vehicle rear side surface of the rear wheel house end panel 112, whereby the vehicle body rear structure 100 is in the state shown in FIG. As a result, as shown in FIG. 5, the tail end member reinforcement 140b is a junction between the rear wheel house end panel 112, the rear floor panel 122, the rear wheel house inner panel 124, and the like as viewed from the rear of the vehicle (in rear view). It is arranged at the position that overlaps.

  The rear wheel house end panel 112 (front side corner panel) to which the rear floor panel 122 and the rear wheel house inner panel 124 (vehicle interior surface panel) constituting the vehicle interior space are joined as in the present embodiment is different from the above. By attaching tail end member reinforcements 140a and 140b (reinforcing members) to the left corner portion 134a and the right corner portion 134b (tail end member 130) which are rear corner panels of the body, the tail end of the rear wheel house end panel 112 is provided. Even when a space for attaching the member reinforcements 140a and 140b cannot be secured, the tail end member reinforcements 140a and 140b can be disposed at the corner 100b of the opening 100a. The tail end member reinforcements 140a and 140b are attached after the rear floor panel 122, the rear wheel house inner panel 124, and the like are welded to the rear wheel house end panel 112, so that they naturally do not hinder the welding operation. .

  Then, at the corner of the vehicle body rear structure 100 shown in FIG. 1, a tail end member reinforcement 140b is arranged in a closed section by the rear wheel house end panel 112 and the tail end member 130 as shown in FIG. A closed cross section is formed by the wheel house end panel 112 and the right corner portion 134b (tail end member 130), and a closed cross section is formed by the rear wheel house end panel 112 and the tail end member reinforcement 140b. That is, when viewed from the rear of the vehicle, a closed cross section is formed at a position (region) that overlaps the junction of the rear wheel house end panel 112, the rear floor panel 122, the rear wheel house inner panel 124, and the like, thereby improving rigidity.

  In particular, in the present embodiment, the area of the closed section formed at the corner 100b shown in FIG. 3B is set to be larger than the area of the closed section formed at the side edge and the lower edge. For example, when the tail end member 130 is joined to the rear wheel house end panel 112 as described above, the end of the rear skirt panel 114 in the vehicle width direction is joined to the rear wheel house end panel 112, as shown in FIG. As described above, the closed cross section formed by the rear skirt panel 114 and the tail end member 130 is disposed at the center in the vehicle width direction.

  As can be seen by comparing FIG. 3 (a) and FIG. 3 (b), the area of the closed cross section formed at the corner 100b shown in FIG. 3 (b) is equal to the rear skirt panel 114 and the tail shown in FIG. 3 (a). It is larger than the area of the closed section formed by the end member 130, that is, the closed section of the lower edge. Thereby, the highest rigidity can be obtained at the corner 100b of the opening 100a that requires higher rigidity (body torsional rigidity) than the side edge and the lower edge, and the corner 100b is suitably reinforced.

  As described above, according to the vehicle body rear portion structure 100 of the present embodiment, the tail end member reinforcements 140a and 140b are arranged at positions overlapping the joints between the rear wheel house end panel 112 and the rear wheel house inner panel 124 and the like. Since it is possible, the tail end member reinforcements 140a and 140b can be disposed in the corner 100b without impeding workability during welding. Accordingly, high rigidity (body torsional rigidity) can be obtained at the corner 100b while satisfying the productivity, and it is possible to ensure the running stability of the vehicle and to enlarge the back door opening 100a.

  In the above-described embodiment, the case where the rear wheel house inner panel 124 is directly joined (welded) to the rear wheel house end panel 112 is described as an example, but the present invention is not limited to this. For example, when another panel (member) is disposed between the rear wheel house inner panel 124 and the rear wheel house end panel 112 in the vehicle longitudinal direction, the rear wheel house inner panel 124 is connected to the rear wheel house end panel via the panel. It may be joined to the panel 112. Thus, the present invention can be applied to a vehicle having a long distance from the wheel house to the rear end of the vehicle.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used in a vehicle body rear structure that includes a back door opening to which a back door is attached at a vehicle rear portion.

DESCRIPTION OF SYMBOLS 100 ... Car body rear part structure, 100a ... Opening part, 100b ... Corner, 102 ... Roof panel, 104a ... Lamp housing, 104b ... Lamp housing, 110 ... Back panel, 112 ... Rear wheel house end panel, 114 ... Rear skirt panel, 122 ... Rear floor panel, 124 ... Rear wheel house inner panel, 130 ... Tail end member, 132 ... Center part, 134a ... Left corner part, 134b ... Right corner part, 140a ... Tail end member reinforcement, 140b ... Tail end member reinforcement

Claims (2)

A vehicle body rear structure having an opening for a back door at the vehicle body rear part,
A front corner panel constituting a corner between a side edge and a lower edge of the opening;
A vehicle interior panel that is joined to the vehicle front side of the front corner panel and faces the vehicle interior space;
A rear corner panel overlapping the front corner panel from the rear of the vehicle;
A reinforcement member attached to the vehicle front side of the rear corner panel at a position overlapping the junction of the vehicle interior panel and the front corner panel as viewed from the rear of the vehicle;
The vehicle body rear structure, wherein a closed cross section by the front corner panel and the rear corner panel and a closed cross section by the front corner panel and the reinforcing member are formed at the corner.   The vehicle body rear part structure according to claim 1, wherein an area of a closed section formed at the corner is larger than an area of a closed section formed at the side edge or the lower edge.

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