JP7064806B2 - Vehicle body rear structure - Google Patents

Description

The present invention relates to a vehicle body rear structure including an anchor portion for supporting a seat belt on an inner panel of a rear pillar.

In some vehicles, an anchor for fastening a seat belt is attached to an inner panel of a rear pillar (for example, Patent Document 1). When the vehicle suddenly stops due to a frontal collision of the vehicle, inertial force acts on the occupants in the vehicle, and the occupants try to move forward from the seat. If the occupant is restrained on the seat by the seat belt, the seat belt prevents the occupant from moving forward from the seat even when the inertial force is applied. However, when an excessive inertial force acts on the occupant, the seat belt is pulled greatly forward. Due to this tensile load, stress is concentrated on the mounting location of the anchor in the rear pillar, and the cross section of the rear pillar may collapse. If the cross section of the rear pillar collapses, the occupant's restraint performance by the seat belt deteriorates.

In the technique of Patent Document 1, the rear end portion of the inner panel of the roof side rail extending in the front-rear direction of the vehicle body is extended downward, and the extended extending portion and the inner panel of the rear pillar are overlapped and joined. An anchor for fastening the seat belt is attached to the overlapped part. Since the rear pillar reinforces the area where the extension portions are overlapped with each other, the anchor is attached to this reinforcing portion to prevent the rear pillar from collapsing due to a large tensile load.

Japanese Unexamined Patent Publication No. 2011-25849

In the technique of Patent Document 1, even when an excessive inertial force acts on the occupant, the restraining performance of the occupant by the seat belt can be ensured, but it is necessary to extend the inner panel of the roof side rail to a special shape and the extension thereof. The structure is complicated because it is necessary to attach an anchor to the part where the extension part and the inner panel of the rear pillar are overlapped.

As a technique for suppressing the cross-sectional collapse of the rear pillar, it is conceivable to increase the thickness of the inner panel of the rear pillar or set a large number of reinforcing members, but in this case, the cost and weight increase, and the productivity increases. It gets worse.

Therefore, one of the objects of the present invention is to provide a vehicle body rear structure capable of ensuring the restraining performance of the occupant by the seat belt even when an excessive inertial force acts on the occupant with a simple configuration.

The vehicle body rear structure according to one aspect of the present invention is
A rear pillar having an inner panel and an outer panel forming a closed cross-sectional space between the inner panel and the inner panel.
Anchor that is attached to the inner panel and supports the seat belt,
It has one end that is directly joined to the outer panel and the other end that is directly or indirectly joined to the inner panel, and is arranged on the rear side of the vehicle in the closed cross-sectional space. It is provided with a reinforcing member for reinforcing the attachment point of the stay member for assisting the opening and closing of the back door with respect to the rear pillar.
When the cross section of the rear pillar is taken on a plane including the tension direction of the seat belt with the anchor portion as a base point, the anchor portion and the one end portion and the other end portion of the reinforcing member are located on the plane. The rear structure of the vehicle body.

In the rear structure of the vehicle body, the rear pillar has a rear pillar structure based on the attachment point of the anchor part to the inner panel even when an excessive inertial force acts on the occupant due to a frontal collision of the vehicle and a large tensile load is applied to the seat belt. It is possible to suppress the collapse of the cross section, and it is possible to suppress the deterioration of the restraint performance of the occupant due to the seat belt. In the rear structure of the vehicle body of the vehicle, when the cross section of the rear pillar is taken on a plane including the tension direction of the seat belt with the anchor portion attached to the inner panel as a base point, the anchor portion and the one end portion and the other end portion of the reinforcing member are formed. Is located on the plane, so even if stress is concentrated at the attachment point of the anchor portion to the inner panel, the stress can be dispersed to the reinforcing member. Further, in the vehicle body rear structure of the vehicle, since the reinforcing member is directly joined to the outer panel, the stress dispersed in the reinforcing member can be more efficiently dispersed in the outer panel.

When the vehicle is provided with a flip-up back door, stay members that assist the opening / closing operation of the back door are provided at each end in the vehicle width direction. The stay member is provided so as to bridge between the rear pillar forming the back door opening of the vehicle body and the back door. When the vehicle is provided with a stay member, generally, a reinforcing member for reinforcing the mounting portion is provided at the mounting portion of the stay member with respect to the rear pillar. The rear structure of the vehicle body of the vehicle suppresses the cross-sectional collapse of the rear pillar by arranging the reinforcing member at a specific position, and the inner panel of the rear pillar is thickened or the anchor portion is attached to the inner panel. It is not necessary to separately set a reinforcing member to reinforce the part to increase the strength and rigidity of the inner panel. Therefore, the vehicle body rear structure of the vehicle is advantageous in terms of cost, weight, and productivity.

It is a side view which looked at the rear pillar provided in the body rear structure of the vehicle which concerns on embodiment from the inside of a vehicle. It is sectional drawing which cut at the (II)-(II) cutting line of FIG.

The vehicle body rear structure according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, the anchor portion attached to the inner panel of the rear pillar is omitted. The same reference numerals in the figure indicate the same names. In the following explanation, "front", "rear", "right", "left", "top", and "bottom" refer to the vehicle when the occupant is seated on the seat and viewed in the vehicle traveling direction. The front is "front" and means the direction based on this. In the figure, the arrow FR is the front side in the front-rear direction of the vehicle, the arrow RR is the rear side, the arrow RH is the right side in the vehicle left-right direction (vehicle width direction), and the arrow LH. Indicates the left side, the arrow UP indicates the upper side in the vertical direction of the vehicle, and the arrow LWR indicates the lower side. The vehicle body rear structure is basically a symmetrical structure, and in FIGS. 1 and 2, only the right side portion of the vehicle body rear structure is shown, and the left side portion is omitted.

〔overall structure〕
The vehicle body rear structure 1 according to the embodiment includes a rear pillar 10 having an inner panel 11 and an outer panel 12, an anchor portion 20 for locking a seat belt attached to the inner panel 11, and a vehicle rather than an anchor portion 20 in the rear pillar 10. It includes a reinforcing member 30 arranged on the rear side. The reinforcing member 30 is a member that reinforces the attachment point to the rear pillar 10 in the stay member 2 that assists the opening / closing operation of the back door 4. When the vehicle body rear structure 1 according to the embodiment has a cross section of the rear pillar 10 on a plane including the tension direction of the seat belt (direction of the solid line arrow shown in FIGS. 1 and 2) with the anchor portion 20 as a base point. As shown in FIG. 2, one of the features is that the anchor portion 20 and both end portions (inner side end portion 31 and outer side end portion 32) of the reinforcing member 30 are located on the plane. Hereinafter, the configuration of the vehicle body rear structure 1 of the vehicle will be described first, and then the actions and effects will be described.

[Rear pillar]
The rear pillar 10 extends in the vertical direction of the vehicle to form a rear outer portion of the vehicle body. An opening of the back door 4 is formed by a roof panel (not shown) spanning between the left and right rear pillars 10, a pair of roof side rails (not shown) extending in the front-rear direction of the vehicle, and a rear panel (not shown) arranged opposite to the roof panel. Will be done. The back door 4 is a flip-up type and is attached to the rear end of the roof panel via a hinge. An opening of the side door 5 is formed in front of each rear pillar 10 and below the roof side rail.

As shown in FIG. 2, the rear pillar 10 is arranged apart from the inner panel 11 on the outer side in the vehicle width direction of the inner panel 11 and has an outer panel 12 forming a closed cross-sectional space 14 between the inner panel 11 and the inner panel 11. To prepare for. In this example, the rear pillar 10 includes a back door opening panel 13 interposed between the inner panel 11 and the outer panel 12 on the rear side of the vehicle. That is, in this example, the closed cross-section space 14 is formed by the inner panel 11, the outer panel 12, and the back door opening panel 13. The back door opening panel 13 constitutes the rear end surface of the vehicle body, and a stay member 2 that assists the opening / closing operation of the back door 4 is attached to the rear end surface (outer surface) via the bracket 3. As shown in FIG. 2, in the rear pillar 10, the inner panel 11 and the outer panel 12 are directly joined to each other on the front side of the vehicle, and the inner panel 11 and the back door opening panel 13 are directly joined to each other on the rear side of the vehicle. At the same time, the outer panel 12 and the back door opening panel 13 are directly joined. Examples of the joining method include spot welding.

An anchor portion 20, which will be described later, is attached to the inner panel 11. As shown in FIG. 1, a seat surface 110 is provided at a position where the anchor portion 20 is attached to the inner panel 11. In this example, a reinforcing bead 111 extending from the seat surface 110 toward a corner formed by a rear pillar 10 and a roof side rail and a roof panel (not shown) is provided. Since the corner portion is strong as a vehicle skeleton, by providing the reinforcing bead 111 toward the corner portion, the stress applied to the attachment portion of the anchor portion 20 with respect to the inner panel 11 is dispersed in the corner portion of the rear pillar 10. It is easy to suppress the collapse of the cross section.

[Anchor part]
The anchor portion 20 is attached to the inner panel 11 and supports a seat belt (not shown). A nut plate 21 is joined to the surface of the inner panel 11 on the closed cross-section space 14 side corresponding to the seat surface 110, and the anchor portion 20 is screwed to the nut plate 21 by bolts 22.

[Reinforcing member]
The reinforcing member 30 is a member that reinforces the mounting portion (bracket 3) of the stay member 2 with respect to the rear pillar 10 (in this example, the back door opening panel 13). The stay member 2 has an upper end portion joined to the upper portion of the rear pillar 10 (back door opening panel 13) and a lower end portion joined to the inner panel of the back door 4 so as to bridge between the rear pillar 10 and the back door 4. , Is a member that assists the opening / closing operation of the back door 4. The stay member 2 is composed of, for example, a cylinder and a gas stay including a rod inserted into the cylinder so as to be able to advance and retreat. The connecting portion between the stay member 2 and the bracket 3 does not appear in the cross section of FIG.

The reinforcing member 30 is provided on the surface of the back door opening panel 13 on the closed cross-sectional space 14 side corresponding to the mounting location. The reinforcing member 30 includes an outer side end portion 32 directly joined to the outer panel 12 and an inner side end portion 31 directly or indirectly joined to the inner panel 11. In this example, the inner side end portion 31 of the reinforcing member 30 is directly joined to the back door opening panel 13, and is indirectly joined to the inner panel 11 via the back door opening panel 13. The reinforcing member 30 may be directly joined to the inner panel 11. Examples of the joining method include spot welding.

When the reinforcing member 30 has a cross section of the rear pillar 10 on a plane including the tension direction of the seat belt (direction of the solid arrow shown in FIGS. 1 and 2) with the anchor portion 20 as the base point, the outer side end portion 32 and the reinforcing member 30 It is located on the plane including the inner side end portion 31. The base point of the anchor portion 20 here is the intersection of the inner panel 11 of the rear pillar 10 and the central axis of the bolt 22 that connects the anchor portion 20 to the inner panel 11. The plane including the tension direction of the seat belt with the anchor portion 20 as the base point is a plane that intersects the rear pillar 10 in the vertical direction. Further, the plane is an inclined plane that intersects the horizontal plane non-orthogonally, and the intersection line with the horizontal plane is a line orthogonal to the tensile direction. The reinforcing member 30 is located on the same plane as the anchor portion 20 including the outer side end portion 32 and the inner side end portion 31 on the above plane. The tension direction of the seat belt may be displaced within a slight range depending on the size of the occupant and the like. The tension direction of the seat belt referred to here is a general one that goes from the surface of the inner panel 11 of the rear pillar 10 with the anchor portion 20 as the base point to the inside and downward of the vehicle and can prevent the occupant seated in the seat from moving forward. It is the pulling direction when the seat belt is operating. In consideration of this displaceable range, the reinforcing member 30 is located on the plane including the outer side end portion 32 and the inner side end portion 31 regardless of the cross section of the rear pillar 10 in the plane including any tensile direction. It has such a size.

[Action and effect]
When an excessive inertial force acts on the occupant due to a frontal collision of the vehicle or the like and a large tensile load acts on the seat belt, the stress concentrates on the attachment portion of the anchor portion 20 with respect to the inner panel 11. When the cross section of the rear pillar 10 is taken on a plane including the tensile direction of the seat belt with the anchor portion 20 as a base point, the outer side end portion 32 and the inner side end portion 31 of the reinforcing member 30 are not located on the plane. Then, the rear pillar 10 is deformed so as to rotate in the tension direction side about the centroid C of the closed cross-sectional space 14, and the cross-sectional collapse occurs. On the other hand, when the outer side end portion 32 and the inner side end portion 31 of the reinforcing member 30 are located on the plane, the stress acting on the attachment portion of the anchor portion 20 with respect to the inner panel 11 is dispersed in the reinforcing member 30. To. Further, when the reinforcing member 30 is directly joined to the outer panel 12, the stress dispersed in the reinforcing member 30 is further dispersed in the outer panel. In the vehicle body rear structure 1 according to the embodiment, the stress acting on the attachment portion of the anchor portion 20 with respect to the inner panel 11 is dispersed in the reinforcing member 30 and the outer panel 12, so that the rear pillar 10 has a closed cross-sectional space. It is possible to suppress deformation so as to rotate in the tensile direction side around the center of gravity C of 14, and it is possible to suppress the occurrence of cross-sectional collapse. By suppressing the cross-sectional collapse of the rear pillar 10, it is possible to secure the restraining performance of the occupant by the seat belt.

When the vehicle is provided with a flip-up back door 4, a stay member 2 that assists in opening and closing the back door 4 is generally attached to the rear pillar 10 and at the same time, the attachment portion of the stay member 2 to the rear pillar 10 is reinforced. Therefore, the reinforcing member 30 is provided on the closed cross-sectional space 14 side of the rear pillar 10. The vehicle body rear structure 1 of the vehicle suppresses the cross-sectional collapse of the rear pillar 10 by arranging the reinforcing member 30 which is generally provided at a specific position. That is, in the vehicle body rear structure 1 of the vehicle, the inner panel 11 of the rear pillar 10 is thickened, and a reinforcing member for reinforcing the attachment portion of the anchor portion 20 to the inner panel 11 is separately set. There is no need to increase the strength or rigidity of the panel 11. Further, it is not necessary to increase the size of the seat surface 110 or the nut plate 21 provided at the mounting location of the anchor portion 20 with respect to the inner panel 11. Therefore, the vehicle body rear structure 1 of the vehicle can suppress the cross-sectional collapse of the rear pillar 10 with a simple configuration, and is advantageous in terms of cost, weight, and productivity. By suppressing the increase in size of the seat surface 110, a seat belt with a pretensioner can be suitably used for the vehicle body rear structure 1 of the vehicle.

The present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. For example, in the above-described embodiment, the inner panel 11 and the outer panel 12 of the rear pillar 10 may be directly joined to each other without an intervening member such as the back door opening panel 13. In this case, in the reinforcing member 30, the outer side end portion 32 is directly joined to the outer panel 12, and the inner side end portion 31 is directly joined to the inner panel 11.

1 Rear pillar structure 10 Rear pillar 11 Inner panel 110 Seat surface 111 Reinforcing bead 12 Outer panel 13 Back door opening panel 14 Closed cross-section space 20 Anchor part 21 Nut plate 22 Bolt 30 Reinforcing member 31 Inner side end 32 Outer side end 2 Stay member 3 Bracket 4 Backdoor 5 Side door

Claims (1)

A rear pillar having an inner panel and an outer panel forming a closed cross-sectional space between the inner panel and the inner panel.
Anchor that is attached to the inner panel and supports the seat belt,
It has one end that is directly joined to the outer panel and the other end that is directly or indirectly joined to the inner panel, and is arranged on the rear side of the vehicle in the closed cross-sectional space. It is provided with a reinforcing member for reinforcing the attachment point of the stay member for assisting the opening and closing of the back door with respect to the rear pillar.
When the cross section of the rear pillar is taken on a plane including the tension direction of the seat belt with the anchor portion as a base point, the anchor portion and the one end portion and the other end portion of the reinforcing member are located on the plane. And the other end is located inside the vehicle and in front of the vehicle with respect to the one end .
The rear structure of the vehicle body.

Images