JP7188151B2 - rear body structure - Google Patents

Description

The present invention relates to a vehicle body rear structure.

A vehicle such as a hatchback type or a wagon type has a back door opening formed in the rear portion of the vehicle body. A back door is attached to the back door opening via a hinge. A load from the back door is input to the hinge when the back door is opened and closed. For this reason, the portion to which the hinge is attached needs to be rigid enough to withstand the load.

Patent Literature 1 describes a vehicle body rear structure having rear pillars disposed on both sides in the vehicle width direction that form a tailgate opening of the vehicle body, and a rear roof rail connected between upper ends of the rear pillars. The rear roof rail has an inner roof rail, an outer roof rail, and a pair of left and right reinforcements.

The roof rail inner is provided between the upper ends of the rear pillars. The reinforcements are provided on the upper surfaces of both vehicle width direction end portions of the roof rail inner. The reinforcement also has a pedestal-shaped tailgate attachment portion to which the tailgate hinge is attached. The tailgate mounting portion forms a first closed cross-sectional portion with both vehicle width direction end portions of the roof rail inner. The roof rail outer is provided on the upper surface of the roof rail inner between the reinforcements, and forms a second closed cross-section between the reinforcements that is continuous with the first closed cross-section.

In Patent Document 1, the center side in the vehicle width direction of the rear roof rail is secured by the second closed cross-section portion, and the both end sides in the vehicle width direction are secured by the first closed cross-section portion. It is said that the rigidity strength of can be optimized.

JP 2016-7966 A

However, in Patent Document 1, the portion to which the hinge is attached, that is, the tailgate attachment portion of the reinforcement only forms the first closed cross-sectional portion between both ends of the roof rail inner in the vehicle width direction. In other words, in Patent Document 1, even if the rigidity of the entire rear roof rail is optimized, it is difficult to sufficiently suppress the torsional deformation of the portion where the hinge is attached due to the load input to the hinge.

SUMMARY OF THE INVENTION In view of such problems, an object of the present invention is to provide a vehicle rear portion structure that increases the torsional rigidity of the vehicle rear portion and suppresses torsional deformation due to the load from the hinge.

In order to solve the above-mentioned problems, a typical configuration of the vehicle body rear structure according to the present invention is a vehicle roof panel that covers the upper part of the vehicle compartment, and a body that is continuous with the body and extends in the vehicle width direction to the inside of the vehicle. A vehicle rear structure comprising a roof panel having a recessed rear end and a hinge fixed near the vehicle side surface of the roof panel at the rear end to which a back door is attached, wherein the vehicle rear structure further includes: extending in the vehicle width direction and joined to the main body and the rear end of the roof panel to form a closed section with the roof panel; and a reinforcing member arranged in the closed section to reinforce the roof panel and the roof rail. The reinforcing member includes a first region joined to the main body of the roof panel together with the roof rail, and a mountain-folded first region extending in the vehicle width direction at the boundary between the first region and recessed inwardly of the vehicle and extending in the vehicle width direction. and a second region that forms a ridgeline and is joined to the rear end of the roof panel together with the roof rail to fix the hinge. The vehicle-interior end portion of the reinforcing member branches into a second ridge line and a third ridge line that extend in a vertical direction and reach the roof rail, and connects the ends of the second ridge line and the third ridge line that reach the roof rail. , and the roof rail.

ADVANTAGE OF THE INVENTION According to this invention, the torsional rigidity of the vehicle body rear part can be improved, and the vehicle body rear part structure which can suppress the torsional deformation by the load from a hinge can be provided.

1 is a diagram schematically showing the appearance of a vehicle to which a vehicle body rear portion structure according to an embodiment of the invention is applied; FIG. It is a figure which expands and shows the state which abbreviate|omitted the display of the roof panel from the vehicle body rear part structure of FIG.1(b). FIG. 3 is a view showing part of the vehicle body rear structure of FIG. 2; FIG. 3 is a diagram showing a state in which the vehicle body rear portion structure of FIG. 2 is viewed from above; FIG. 5 is a view showing each cross section of the vehicle body rear structure of FIG. 4;

A typical configuration of the vehicle body rear portion structure according to one embodiment of the present invention is a vehicle roof panel that covers the upper part of the vehicle compartment and a main body that is continuous with the main body and is recessed inward of the vehicle in the vehicle width direction. In a vehicle body rear structure including a roof panel having a rear end and a hinge fixed near the vehicle side surface of the roof panel to which a back door is attached, the vehicle body rear structure further extends the vehicle interior side of the roof panel to the vehicle width. a roof rail that extends in a direction and is joined to a body portion and a rear end portion of a roof panel to form a closed cross section with the roof panel; is a first area joined to the main body of the roof panel together with the roof rails, and a mountain-folded first ridgeline extending in the vehicle width direction at the boundary between the first area and recessed toward the vehicle interior side and continuing to the first area. and a second region that is joined to the rear end portion of the roof panel together with the roof rail and to which the hinge is fixed. The vehicle inner end of the reinforcing member, which branches into the second and third mountain-folded ridges reaching the roof rail and connects the ends of the second and third ridges reaching the roof rail, is connected to the roof rail. characterized by forming a space between

In the above configuration, a load is input to the rear end portion of the roof panel to which the hinge is attached when the back door is opened or closed or when the vehicle is running. Since the rear end portion of the roof panel is overlapped with the second region of the reinforcing member and the roof rail and joined to them for reinforcement, torsional deformation is suppressed when a load is input from the hinge.

Additionally, the load from the hinge is transferred to the reinforcing member. The reinforcing member has a first region and a second region joined to the main body portion and the rear end portion of the roof panel, respectively. It becomes a partitioned shape by branching into three ridges and reaching the roof rail. The vehicle-interior end portion of the reinforcing member connects the ends of the second ridge line and the third ridge line that reach the roof rail, forming a space with the roof rail. That is, the reinforcing member has a triangular wall surface defined by the second ridge line, the third ridge line, and the inner end portion, and furthermore, a space, that is, a closed cross section, is formed between the inner end portion and the roof rail. there is

Therefore, the reinforcing member has a triangular wall surface and a closed cross-section formed between the vehicle inner end and the roof rail to increase torsional rigidity, even when the load is transmitted from the hinge. Torsion deformation is also suppressed. In addition, the reinforcing member has a second region that is continuous with the first region and is recessed toward the interior of the vehicle. can be suppressed. Thus, according to the above configuration, it is possible to increase the torsional rigidity of the rear portion of the vehicle body and suppress torsional deformation due to the load from the hinge.

The roof rail has an upper portion joined to the main body portion of the roof panel, a lower portion joined to the rear end portion of the roof panel, and an intermediate portion connecting the upper portion and the lower portion. is positioned at the upper end of the intermediate portion of the roof rail, and the third ridge line may reach the lower portion of the roof rail.

Thus, the vehicle-interior end of the reinforcing member connects the end of the second ridgeline located at the upper end of the intermediate portion of the roof rail and the end of the third ridgeline reaching the lower portion of the roof rail. Therefore, the vehicle-interior end of the reinforcing member forms a triangular space between the intermediate portion and the lower portion of the roof rail. Since the space is partitioned by the three straight sides in this way, the load can be easily transmitted and the rigidity can be increased. In addition, since the end of the second ridge line is positioned at the upper end of the intermediate portion of the roof rail, the height of the triangular space can be ensured. As a result, since the triangular space does not have a shape in which only one of the three sides is short, the load can be easily transmitted and the torsional rigidity can be maintained.

The length of the third ridgeline is preferably longer than the length from the end of the second ridgeline to the lower portion of the roof rail. Thus, the length of the third ridgeline is longer than the length from the end of the second ridgeline to the lower portion of the roof rail, that is, the length that defines the height of the triangular space. Therefore, since the third ridgeline extends with a gentle inclination toward the lower portion of the roof rail, the load can be smoothly transmitted and stress concentration can be suppressed.

The roof rail includes an opening through which the seat belt device passes vertically and is covered with the reinforcing member, a first mounting seat surface formed on the vehicle rear side of the opening portion to which the seat belt device is mounted, and the first mounting seat surface of the vehicle. It has a second mounting seat surface positioned on the rear side and overlapped with the second region of the reinforcing member to mount the hinge, and the first mounting seat surface and the second mounting seat surface overlap in the vehicle front-rear direction in plan view. , may be connected on a curved surface when viewed from the vehicle width direction.

Thus, since the reinforcing member covers the opening of the roof rail, the opening with low rigidity can be reinforced. In addition, in the roof rail, the first mounting seat surface of the seat belt device and the second mounting seat surface of the hinge overlap in the longitudinal direction of the vehicle, and are connected and continuous by a curved surface. Therefore, in the roof rail, the load received by one mounting seat surface can be easily transmitted to the other mounting seat surface, and the rigidity can be increased.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these examples are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a diagram schematically showing the appearance of a vehicle 102 to which a vehicle body rear portion structure 100 according to an embodiment of the invention is applied. FIG. 1(a) is a diagram showing a state in which the vehicle 102 is viewed obliquely from behind. FIG. 1(b) is an enlarged view of a part of the vehicle body rear structure 100 of FIG. 1(a). In each figure below, the front and rear directions of the vehicle are indicated by arrows Front and Back, the left and right directions of the vehicle width are indicated by arrows Left and Right, and the vertical directions of the vehicle are indicated by arrows Up and Down.

For example, in a hatchback type vehicle 102, a rear opening 104 is formed in the rear portion of the vehicle body as shown in FIG. 1(a). A back door (not shown) is attached to the rear opening 104 by a pair of hinges 106 and 108 so as to be freely opened and closed. The vehicle body rear structure 100 includes a roof panel 110 in addition to hinges 106 and 108 .

The roof panel 110 has, as shown in FIG. 1(b), a main body portion 112 covering the upper part of the passenger compartment and a rear end portion 114. As shown in FIG. The rear end portion 114 is a portion that is continuous with the main body portion 112 and is recessed toward the vehicle interior in the vehicle width direction. The rear end portion 114 has a rear vertical wall portion 118 extending downward from a rear edge 116 of the main body portion 112 and a rear extension portion 122 extending rearward of the vehicle from a lower end 120 of the rear vertical wall portion 118 .

The hinge 106 is fixed near the vehicle side surface of the rear extension portion 122 of the rear end portion 114 of the roof panel 110 . Hinge 108 is arranged symmetrically with hinge 106 as shown in FIG.

FIG. 2 is an enlarged view of the rear vehicle body structure 100 of FIG. 1(b) with the roof panel 110 omitted. The vehicle body rear portion structure 100 further includes a roof rail 124 and a reinforcing member (roof back extension 125).

The roof rail 124 is a member extending in the vehicle width direction on the vehicle inner side of the roof panel 110 shown in FIG. 1(b). The roof rail 124 has a roof back member 126 positioned in the center in the vehicle width direction and a pair of back door hinge reinforcements 128, and is formed by these three members. The back door hinge reinforcement 128 is positioned outside the roof back member 126 in the vehicle width direction, and partially overlaps the roof back member 126 from above. Additionally, the roof rail 124 is joined to the body portion 112 and rear end portion 114 of the roof panel 110 to form a closed cross-section 130 (see FIG. 5) with the roof panel 110 .

Roof back extension 125 is positioned within closed cross-section 130 shown in FIG. The roof back extension 125 has a first region 132 and a second region 134 as shown in FIG. The first region 132 runs along the body portion 112 of the roof panel 110 and joins the body portion 112 of the roof panel 110 with the roof rails 124 at its front portion 136 .

The second region 134 is continuous with the first region 132 and recessed toward the interior of the vehicle. Fixed. At the rear portion 138 of the second region 134, a mounting pedestal 140 that protrudes upward at a position where the hinge 106 is mounted is formed.

A mountain-folded first ridgeline 142 extending in the vehicle width direction is formed at the boundary between the first region 132 and the second region 134 . The first edge 142 branches at a branch point 144 into a second edge 146 and a third edge 148 as shown. The second ridgeline 146 and the third ridgeline 148 are mountain-folded ridgelines that extend away from each other in the longitudinal direction of the vehicle toward the center in the vehicle width direction from the bifurcation point 144 . ing.

The roof back extension 125 further has an inboard end 154 that connects the ends 150 , 152 of the second ridge 146 and the third ridge 148 . Therefore, the roof back extension 125 is formed with a triangular wall surface 156 defined by the second ridge line 146 , the third ridge line 148 and the vehicle interior end portion 154 .

Roof rail 124 also has an upper portion 158 , a lower portion 160 and an intermediate portion 162 . Top portion 158 is joined to body portion 112 of roof panel 110 . Lower portion 160 is joined to rear edge 114 of roof panel 110 . An intermediate portion 162 is a portion that connects the upper portion 158 and the lower portion 160 . As further shown, the distal end 150 of the second ridge 146 is located near the upper end 164 of the intermediate portion 162 of the roof rail 124 . A distal end 152 of the third ridge 148 reaches a lower portion 160 of the roof rail 124 .

The inboard end 154 of the roof back extension 125 also defines a triangular space 166 defined by three straight sides between the middle portion 162 and the bottom portion 160 of the roof rail 124 . In addition, since the end 150 of the second ridge line 146 is positioned at the upper end 164 of the intermediate portion 162 of the roof rail 124, the height of this space 166 can be ensured. Furthermore, the length La of the third ridgeline 148 is longer than the length Lb from the end 150 of the second ridgeline 146 to the lower portion 160 of the roof rail 124 .

As shown in FIG. 2, as a peripheral structure of the vehicle body rear structure 100, a side body outer 168 is arranged on the outside of the roof rail 124 in the vehicle width direction, and a side body outer extension 170 is arranged on the vehicle rear side of the roof rail 124. .

FIG. 3 is a diagram showing a portion of the vehicle body rear structure 100 of FIG. FIG. 3(a) shows a state in which the display of the hinge 106 and the roof back extension 125 is omitted from the rear vehicle body structure 100 of FIG. FIG. 3(b) shows the vehicle rear structure 100 of FIG. 2 as viewed from the inside of the vehicle.

The back door hinge reinforcement 128 of the roof rail 124 has an opening 172 , a first mounting seat surface 174 and a second mounting seat surface 176 . A seatbelt device (seatbelt reminder 178) passes vertically through the opening 172 and is covered with the roof back extension 125 as shown in FIG. Thus, the less rigid opening 172 is reinforced by the roof back extension 125 .

The first mounting seat surface 174 is formed on the vehicle rear side of the opening 172, and a seat belt reminder 178 is mounted with a bolt or the like. Further, the seat belt reminder 178 is attached to a seat surface 180 located on the vehicle front side of the first attachment seat surface 174 with bolts or the like.

The second mounting seat surface 176 is a seat surface to which the hinge 106 is attached, is located on the vehicle rear side of the first mounting seat surface 174, and protrudes upward as shown in FIG. 3(a). The second mounting seat surface 176 also overlaps a mounting base 140 (see FIG. 2) formed in the rear portion 138 of the second region 134 of the roof back extension 125 to mount the hinge 106 thereon.

As shown in FIG. 3B, as a peripheral structure of the vehicle body rear structure 100, a rear pillar inner 182 is arranged on the side of the rear opening 104, and the rear pillar inner 182 is provided with a roof side extending along the side of the passenger compartment. A rail 184 is joined.

FIG. 4 is a diagram showing a state in which the vehicle body rear portion structure 100 of FIG. 2 is viewed from above. 5A and 5B are cross-sectional views of the vehicle body rear structure 100 of FIG. Note that each cross-sectional view additionally shows a roof panel 110 .

In the vehicle body rear structure 100, as shown in the AA cross section of FIG. A shaped space 166 is formed. Further, the roof back extension 125 forms a triangular wall surface 156 defined by the second ridgeline 146, the third ridgeline 148 and the vehicle interior end portion 154 as shown in FIG.

Here, in the vehicle body rear structure 100 , when the back door is opened and closed, a load is input to the rear end portion 114 of the roof panel 110 to which the hinge 106 is attached, and the load is further transmitted to the roof back extension 125 . A load is input to the rear end portion 114 of the roof panel 110 not only when the back door is opened and closed, but also when the vehicle is running. Even in such a case, since the roof back extension 125 has increased torsional rigidity by the triangular wall surface 156 and the triangular space 166, torsional deformation is suppressed.

In addition, in the vehicle body rear portion structure 100, the space 166 is partitioned by three straight sides, so that the load can be easily transmitted and the torsional rigidity can be increased. Furthermore, since the end 150 of the second ridge line 146 is located near the upper end 164 of the intermediate portion 162 of the roof rail 124, the space 166 can secure its height, and the space 166 does not have a shape in which only one of the three sides is short, and the load is reduced. is easily transmitted and torsional rigidity can be maintained.

Furthermore, as shown in FIG. 2, the length La of the third ridgeline 148 is longer than the length Lb from the end 150 of the second ridgeline 146 to the lower portion 160 of the roof rail 124, that is, the length defining the height of the space 166. ing. Therefore, the third ridge line 148 extends toward the lower portion 160 of the roof rail 124 with a gentle slope, thereby smoothing the transmission of the load and suppressing the stress concentration.

5(b) and 5(c), a second region 134 that is continuous with the first region 132 and is recessed toward the vehicle interior is formed by the roof panel 110. It is arranged so as to serve as a backing for the rear vertical wall portion 118 of the rear end portion 114 . Therefore, the rear vertical wall portion 118 of the rear end portion 114 of the roof panel 110 is less likely to deform even if a load is input from the hinge 106 .

Further, the rear extension portion 122 of the rear end portion 114 of the roof panel 110 overlaps the rear portion 138 of the second region 134 of the roof back extension 125 and the roof rail 124 as shown in FIGS. 5(b) and 5(c). are joined and reinforced. Therefore, the rear extension portion 122 of the rear end portion 114 of the roof panel 110 is less likely to deform even if a load is input from the hinge 106 .

As shown in FIG. 4, the first mounting surface 174 and the second mounting surface 176 of the roof rail 124 overlap in the vehicle front-rear direction in plan view. Further, the first mounting seat surface 174 and the second mounting seat surface 176 are connected by the curved surface 186 of the back door hinge reinforcement 128 of the roof rail 124 when viewed from the vehicle width direction as shown in FIG. 5(c). Therefore, in the roof rail 124, the load received by the first mounting seat surface 174 can be easily transmitted to the first mounting seat surface 176, or the load received by the second mounting seat surface 176 can be easily transmitted to the first mounting seat surface 174. Torsional rigidity can be increased.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used for a vehicle body rear portion structure.

DESCRIPTION OF SYMBOLS 100... Vehicle rear part structure 102... Vehicle 104... Rear opening 106, 108... Hinge 110... Roof panel 112... Main body part 114... Rear end part 116... Rear edge of main body part 118... Rear side Vertical wall portion 120 Lower end of rear vertical wall portion 122 Rear extension portion 124 Roof rail 125 Roof back extension 126 Roof back member 128 Back door hinge reinforcement 130 Closed section 132 First area 134 Second area 136 Front part of first area 138 Rear part of second area 140 Mounting base 142 First edge line 144 Branch point 146 Second edge line 148... Third ridge line 150... End of second ridge line 152... End of third ridge line 154... Car interior end portion 156... Wall surface 158... Upper portion 160... Lower portion 162... Intermediate portion 164... Upper end of intermediate portion 166 Space 168 Side body outer 170 Side body outer extension 172 Opening 174 First mounting seat surface 176 Second mounting seat surface 178 Seat belt reminder 180... Seat surface 182... Rear pillar inner 184... Roof side rail 186... Curved surface

Claims (4)

A vehicle roof panel having a main body covering an upper part of a passenger compartment, a roof panel continuous with the main body and having a rear end recessed toward the inside of the vehicle in a vehicle width direction, and a vehicle at the rear end of the roof panel A rear vehicle body structure comprising a hinge fixed near a side surface to which a back door is attached, the rear vehicle body structure further comprising:
a roof rail extending in the vehicle width direction on the vehicle inner side of the roof panel and joined to a body portion and a rear end portion of the roof panel to form a closed cross section with the roof panel;
a reinforcing member arranged in the closed cross section and reinforcing the roof panel and the roof rail;
The reinforcing member is
a first region joined to the main body of the roof panel together with the roof rail;
A mountain fold-shaped first ridgeline extending in the vehicle width direction is formed at the boundary between the first area and the first area and recessed toward the vehicle interior side, and is joined to the rear end portion of the roof panel together with the roof rail. and a second region to which the hinge is fixed,
The first ridgeline branches into a second ridgeline and a third ridgeline extending in the vehicle front-rear direction while being spaced apart from each other toward the center in the vehicle width direction and reaching the roof rail,
A rear portion of the vehicle body, wherein a space is formed between a vehicle-inside end portion of the reinforcing member and the roof rail, which connects ends of the second ridgeline and the third ridgeline that reach the roof rail. structure. The roof rail has an upper portion joined to the main body portion of the roof panel, a lower portion joined to the rear end portion of the roof panel, and an intermediate portion connecting the upper portion and the lower portion,
The second ridgeline is located at the upper end of the intermediate portion of the roof rail,
2. The vehicle body rear portion structure according to claim 1, wherein the third ridgeline reaches a lower portion of the roof rail. 3. The vehicle body rear portion structure according to claim 2, wherein the length of the third ridgeline is longer than the length from the end of the second ridgeline to the lower portion of the roof rail. The roof rail is
an opening through which the seat belt device is passed vertically and covered with the reinforcing member;
a first mounting seat surface formed on the vehicle rear side of the opening for mounting the seat belt device;
a second mounting seat surface located on the vehicle rear side of the first mounting seat surface and overlapping the second region of the reinforcing member to attach the hinge;
4. The first mounting seat surface and the second mounting seat surface overlap each other in the longitudinal direction of the vehicle when viewed from above, and are connected by a curved surface when viewed from the width direction of the vehicle. 2. The vehicle body rear structure according to item 1.

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