JP7296689B2 - vehicle rear structure - Google Patents

Description

The present invention relates to a vehicle rear structure such as an automobile.

Patent document 1 discloses an example of the vehicle rear structure.
FIG. 6 schematically shows the vehicle rear portion structure described in the document. In the vehicle rear portion structure Ae shown in the figure, a door opening portion 3 is formed in a region near the rear portion of a side body panel portion B that constitutes a vehicle side portion. Above the door opening 3 on the vehicle rear side, a fixed window portion 4 fitted with a fixed glass 40 is provided adjacent to the door opening 3 with the rear pillar portion 7 interposed therebetween. In the side body panel portion B, various inner panels are superimposed and joined to the inner surface side of the side outer panel 1 located in the outermost layer. A roof side rail portion 5 is provided above the fixed window portion 4 in the side body panel portion B. As shown in FIG.

In the vehicle rear portion structure Ae described above, a front side member 2A and a rear side member 2B, which are separate panel members, are provided as roof side rail inners constituting the roof side rail portion 5, and these are welded together. It is joined at a position above the fixed window part 4 via a joint part J such as a part.
With such a configuration, it is possible to improve the efficiency (yield) of material picking. That is, when the position where the fixed window portion 4 is formed and its peripheral portion are press-worked from a sheet of panel material, it is necessary to use a panel material of a considerably large size. In addition, since the punched portion of the fixed window portion 4 becomes a waste area, a large amount of waste occurs. Therefore, it causes an increase in cost. On the other hand, if the front side member 2A and the rear side member 2B are joined above the fixed window portion 4, it is possible to solve the above problem.

However, the prior art still has room for improvement as described below.

That is, when a rear collision of the vehicle occurs and a large collision load Fa is input to the rear portion of the vehicle, and this acts on the roof side rail portion 5, the roof side rail portion 5 will be at the joint portion J of the roof side rail/inner. Bending deformation (bending deformation) is likely to occur at the position. When such bending deformation occurs, the lower peripheral portion of the fixed window portion 4 of the side body panel portion B descends as indicated by the arrow N1, and as a result, a portion of the lower peripheral portion of the fixed window portion 4 moves forward as indicated by the arrow N2. This may cause a phenomenon in which the door is displaced to the side and slips inside the rear part of the rear door 9 . If such a phenomenon occurs, the locked state of the rear door 9 may be released and the rear door 9 may be opened improperly.

Although it is desired to appropriately eliminate the above-described fear, as a countermeasure, for example, simply increasing the rigidity of the fixed window portion 4 and its peripheral portion (including the roof side rail portion 5) will not be effective in manufacturing. higher cost. Moreover, an increase in weight and a decrease in productivity are caused.

Japanese Patent Application Laid-Open No. 2008-18750

SUMMARY OF THE INVENTION The present invention has been devised under the circumstances as described above. An object of the present invention is to provide a vehicle rear portion structure capable of appropriately preventing the rear door from being unduly opened due to the input of a collision load to the rear portion of the vehicle.

In order to solve the above problems, the present invention takes the following technical measures.

The vehicle rear structure provided by the present invention includes a side body panel portion forming an opening for a door to be opened and closed by a rear door in a region closer to the rear of the vehicle side portion, and a side body panel portion for the door. A window provided adjacent to the upper part of the opening on the rear side of the vehicle via a rear pillar, and a window forming a part of the side body panel and positioned above the window in the vehicle front-rear direction. between a roof side rail portion extending in the longitudinal direction of the vehicle and having a joint portion between a front side member and a rear side member as separate members adjacent to each other in the vehicle longitudinal direction, and the roof side rail portions on both left and right sides of the vehicle. a bridging rear header panel provided on the front member of the roof side rail portion and behind an inner edge of the door opening in the vehicle front-rear direction. The roof side rail portion is located within a range from the end to the rear end of the parting line of the rear door, and when a load exceeding a predetermined amount is input to the roof side rail portion from the rear side of the vehicle, bending deformation of the roof side rail portion occurs. The front member is provided with a bead portion projecting outward in the vehicle width direction and extending in the vertical direction. By providing two bead portions spaced apart in the longitudinal direction, the region between them serves as the rigid breaking point, or the boundary between the independently provided bead portion and the non-bead portion. The position of the line is defined as the rigidity breaking point, and the end portion of the rear header panel in the vehicle width direction is connected to the inner surface side of the region of the front member where the bead portion is provided, in contact with it. It is characterized by

According to such a configuration, the following effects are obtained.
That is, when a rear collision of the vehicle occurs and the collision load is input to the roof side rail portion, it is possible to bend and deform the roof side rail portion at the position of the rigidity breaking point. As a result, it is possible to avoid large bending deformation of the roof side rail portion at the joint portion between the front side member and the rear side member in the roof side rail portion. Therefore, it is possible to appropriately prevent the rear door from being unduly opened due to bending deformation of the roof side rail portion at the joint portion.
In addition, the rigidity breaking point is located within a range from the rear end of the inner edge of the door opening to the rear end of the parting line of the rear door in the longitudinal direction of the vehicle. is a range where a number of high-strength ridgelines are provided, such as by stamping a plurality of stepped parts, and reinforcing members are arranged to reinforce the peripheral parts of the attachment points such as the rear door striker. Among the side body panel parts, it is considered to be a part whose strength has been actively increased. Therefore, even if a rear collision of the vehicle occurs and the roof side rail portion is bent and deformed at the position of the breaking point of rigidity, part of the side body panel portion is likely to slip inside the rear door due to this. It is possible to appropriately prevent the rear door from being unduly opened.
In the present invention, as means for preventing the rear door from being unduly opened in the event of a rear-end collision of the vehicle, a means for providing a rigid breaking point is employed. It is possible to eliminate or reduce the need to stiffen the perimeter. Therefore, it is possible to appropriately reduce the vehicle weight and the manufacturing cost.

Other features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

1 is a side view of a main part showing an example of a vehicle rear portion structure according to the present invention; FIG. FIG. 2 is a side view of a main portion of the vehicle rear portion structure shown in FIG. 1 with a side outer panel omitted; FIG. 3 is a perspective view of a main part of FIG. 2; FIG. 4 is a sectional view along IV-IV in FIG. 3; 4 is a cross-sectional view taken along the line VV of FIG. 3; FIG. It is a principal part side view which shows an example of a prior art.

Preferred embodiments of the present invention will be specifically described below with reference to the drawings.
For ease of understanding, elements identical or similar to the configuration of the prior art shown in FIG.
The drawings show only the structure on the right side of the vehicle and omit the structure on the left side.

A vehicle rear structure A shown in FIG. 1 includes a side body panel portion B and a rear header panel 6 .
The side body panel portion B is a main member that constitutes the side portion of the vehicle, and is joined by combining the side outer panel 1 and a plurality of inner panels 2 (see also FIG. 2) that are positioned inside and joined to each other. It is configured by

A door opening portion 3, a window portion 4, and a roof side rail portion 5 positioned above the window portion 4 and extending in the vehicle front-rear direction are provided in a region near the rear portion of the side body panel portion B. As shown in FIG.
The door opening 3 is an opening that is opened and closed by a rear door (not shown) as a side door having a rotating shaft at the front. A plurality of stepped portions are formed by press working, and a plurality of ridgelines L are provided as apexes of these stepped portions. The region provided with the plurality of ridgelines L has higher rigidity than the region where the ridgeline L is not provided. In this embodiment, the outermost edge line L among the plurality of edge lines L corresponds to the parting line La of the rear door (the boundary line between the rear door and the side body panel portion B).
Although illustration and explanation are omitted, near the parting line La on the vehicle rear side of the door opening 3, a striker for locking the closed state of the door when the rear door is closed, and the vicinity of the attachment point are reinforced. A reinforcing member is provided for this purpose, and the strength is improved.

The window portion 4 is a fixed window portion in which a window opening formed in the side body panel portion B is closed with a fixed glass 40 . The window portion 4 is provided adjacent to the door opening portion 3 via the rear pillar portion 7 at a position closer to the upper portion on the rear side of the vehicle.

As an inner panel (roof side rail inner) 2 of the roof side rail portion 5, a front side member 2A(2) and a rear side member 2B(2) are provided adjacently in the vehicle longitudinal direction. The rear end portion of the front side member 2A and the front end portion of the rear side member 2B are in contact with each other at a position above the window portion 4, and are connected via a joint portion J as a welding portion, for example. According to such a configuration, it is not necessary to prepare a large-sized inner panel and then punch out the window openings in the inner panel, as in the prior art, thereby improving the efficiency of material removal. Is possible.

A rigid breaking point 8 is provided in the roof side rail portion 5 at a position on the front side of the vehicle with respect to the joint portion J described above. More specifically, as shown in FIGS. 3 to 5, the front member 2A is provided with a rigid breaking point 8 located on the front side of the vehicle with respect to the joint J. As shown in FIG. The front member 2</b>A is provided with two bead portions 20 that are spaced apart in the vehicle front-rear direction.
Here, the rigidity breaking point 8 is a point where the rigidity of the roof side rail portion 5 changes (rapidly changes). This is a starting point that induces bending deformation of the side rail portion 5 . In other words, it is a portion of the roof side rail portion 5 that is more likely to undergo bending deformation than other portions, and preferably, is a portion that is as likely to undergo bending deformation as the joint portion J or more.

In the present embodiment, the two bead portions 20 are formed by subjecting the front member 2A to a so-called step pressing process, and a partial region of the front member 2A is processed to protrude outward in the vehicle width direction. It has a vertically elongated rectangular shape extending in the vertical direction when viewed from the side of the vehicle. The formation location of the bead portion 20 itself is a region with high rigidity, but the region between these two bead portions 20 is a region with relatively low rigidity relative to the two bead portions 20, so the rigidity breaking point 8.

The position of the rigidity breaking point 8 is on the front side of the vehicle relative to the joint J as described above, but in addition to this, as shown in FIG. It is set within a range R from the rear end Pb of the edge portion to the rear end Pa of the parting line La of the rear door. It is sufficient that the center line CL in the longitudinal direction of the vehicle of the rigidity breaking point 8 is within the range R described above. Preferably, the rigid breaking point 8 is located on the front side of the vehicle with respect to the window portion 4 .

The rear header panel 6 is a member that bridges between the roof side rail portions 5 on both left and right sides of the vehicle (the left roof side rail portion is not shown) and extends in the vehicle width direction. ) is a member that supports the rear part of the An end portion 60 of the rear header panel 6 in the vehicle width direction abuts on the inner surface side of the region of the front member 2A where the two bead portions 20 are provided, and is connected by means such as welding. there is

Next, the operation of the vehicle rear portion structure A will be described.

In FIG. 1 , when a vehicle rear-end collision occurs and the collision load F is applied to the roof side rail portion 5 , the roof side rail portion 5 can be bent and deformed at the rigidity breaking point 8 . At that time, although there is a possibility that bending deformation may occur at the joint J of the roof side rail portion 5, even if bending deformation occurs at this joint J, it is possible to suppress the amount of deformation to a small amount. be. If a large bending deformation occurs at the joint J, a portion of the side body panel portion B will slip into the rear inner side of the rear door according to the principle described with reference to FIG. According to this embodiment, it is possible to eliminate such fear.

On the other hand, as described above, the rigidity breaking point 8 is the rigidity within the range R from the rear end Pb of the inner edge of the door opening 3 to the rear end Pa of the parting line La of the rear door in the longitudinal direction of the vehicle. located in the high range. Therefore, even if the roof side rail portion 5 bends and deforms at the rigidity breaking point 8, the side body panel portion B does not partly slide into the rear door due to the bending deformation. As a result, even if bending deformation occurs at the position of the rigidity breaking point 8, the rear door will not unduly open due to this.

In this embodiment, a rigid breaking point 8 is provided as a means for preventing the rear door from opening in the event of a rear-end collision of the vehicle. The structure is simple and the manufacturing is easy. An increase in the number of parts and an increase in weight can be eliminated, and an increase in manufacturing cost can be suppressed appropriately.

Since the ends of the rear header panel 6 are attached to the regions reinforced by the two bead portions 20, the attachment strength of the rear header panel 6 can be increased. In particular, since the bead portion 20 has a shape that extends in the vertical direction, the area where the bead portion 20 is provided is less likely to undergo bending deformation (vibration) in the vertical direction. As a result, an effect of suppressing the vertical vibration of the roof of the vehicle and the resulting muffled sound can be expected.

The invention is not limited to the content of the embodiments described above. The specific configuration of each part of the vehicle rear portion structure according to the present invention can be changed in various ways within the intended scope of the present invention.

In the above-described embodiment, as means for providing the roof side rail portion with a breaking point of rigidity, the roof side rail portion is provided with two bead portions extending in the vertical direction. is not limited to For example, the shape and size of each of the two bead portions are changed to other shapes and sizes, or only one bead portion is provided, and the position of the boundary line between this bead portion and the non-bead portion is the rigid breaking point. It is also possible to make

The rigidity breaking point may be the starting point of bending deformation of the roof side rail portion when a load exceeding a predetermined amount is input to the roof side rail portion from the rear side of the vehicle. It does not matter if bending deformation occurs simultaneously at the position of the joint with. This is because the amount of bending deformation at the position of the joint is reduced, thereby obtaining the effect of suppressing improper opening of the rear door.

Although FIG. 1 shows a side body panel portion of a so-called sedan type vehicle, the type of vehicle to which the present invention is applied is not limited to this. For example, it can be applied to other vehicle types such as one-box type.

A Vehicle rear structure B Side body panel portion La Rear door parting line Pa Rear end of rear door parting line Pb Rear end of inner edge of door opening 1 Side outer panel 2 Inner panel 3 Door opening 4 Window 5 Roof Side rail section 7 Rear pillar section 8 Rigidity breaking point

Claims (1)

a side body panel portion forming a door opening that is opened and closed by a rear door in a region near the rear of the vehicle side;
a window portion of the side body panel portion provided adjacent to an upper portion of the door opening on the vehicle rear side via a rear pillar portion;
A joint portion between a front side member and a rear side member which forms a part of the side body panel portion, is positioned above the window portion and extends in the vehicle front-rear direction, and is a separate member adjacent in the vehicle front-rear direction. a roof side rail portion having;
a rear header panel bridge-connected between the roof side rail portions on both left and right sides of the vehicle;
A vehicle rear structure comprising:
provided on the front member of the roof side rail portion and positioned within a range from the rear end of the inner edge of the door opening in the vehicle front-rear direction to the rear end of the parting line of the rear door; further comprising a rigid breaking point that becomes a starting point of bending deformation of the roof side rail portion when a load exceeding a predetermined amount is input to the rail portion from the rear side of the vehicle ,
The front member is provided with a bead portion projecting outward in the vehicle width direction and extending in the vertical height direction. is provided, the region between them is the rigid breaking point, or the position of the boundary line between the bead portion and the non-bead portion provided independently is the rigid breaking point,
The vehicle rear portion structure, wherein an end portion of the rear header panel in the vehicle width direction is connected to an inner surface side of a region of the front member where the bead portion is provided.

Images