JP2019171899A - Vehicle body rear section structure for vehicle - Google Patents

Abstract

To provide a vehicle body rear section structure for a vehicle capable of securing constraint performance for a crew member by a seat belt by a simple structure even if excessive inertial force is applied to the crew member.SOLUTION: A vehicle body rear section structure for a vehicle includes: a rear pillar 10 that includes an inner panel 11, and an outer panel 12 forming a closed cross-sectional space 14 with the inner panel 11; an anchor portion 20 which is attached to the inner panel 11 and which supports a seat belt; and a reinforcement member 30 which has one end directly joined to the outer panel 12, and another end directly or indirectly joined to the inner panel 11, is disposed at the vehicle rear side relative to the anchor portion 20 in the closed cross-sectional space 14, and reinforces an attachment location of a stay member 2 for supporting opening and closing of a back door relative to the rear pillar 10. When the cross-section of the rear pillar 10 is taken on a plane that includes a tension direction of the seat belt with the anchor portion 20 being as a base point, the one ends and the other ends of the respective another portion 20 and reinforcement member 30 are located on the plane.SELECTED DRAWING: Figure 2

Description

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

  Some vehicles have a seat pillar anchor 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, an inertial force acts on the passenger in the vehicle, and the passenger tries 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 above the seat even when the inertial force is applied. However, when an excessive inertia force acts on the occupant, the seat belt is greatly pulled forward. Due to the tensile load, stress concentrates on the anchor mounting portion of the rear pillar, and the rear pillar may be broken in cross section. If the rear pillar collapses, the restraint performance of the occupant by the seat belt is reduced.

  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 extension portion and the inner panel of the rear pillar are overlapped and joined. The seat belt anchor is attached to the overlapped part. Since the rear pillar is reinforced in the region where the extension portions are overlapped, the anchor is attached to the reinforcing portion, thereby suppressing the rear pillar from being deformed by a large tensile load.

JP 2011-25849 A

  In the technology of Patent Document 1, even if excessive inertia force acts on the occupant, the restraint performance of the occupant by the seat belt can be secured, but it is necessary to extend the inner panel of the roof side rail to a special shape, and extend it. It is necessary to attach an anchor to a portion where the extended portion and the inner panel of the rear pillar are overlapped, and the structure is complicated.

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

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

A vehicle body rear part structure according to one aspect of the present invention includes:
A rear pillar having an inner panel and an outer panel that forms a closed cross-sectional space between the inner panel;
An anchor portion attached to the inner panel and supporting a seat belt;
One end part directly joined to the outer panel and the other end part joined directly or indirectly to the inner panel, and disposed in the closed cross-section space on the vehicle rear side from the anchor part And a reinforcing member that reinforces a mounting portion of a stay member for assisting opening and closing of the back door with respect to the rear pillar,
When the cross section of the rear pillar is taken in a plane including the tension direction of the seat belt with the anchor portion as a base point, the one end portion and the other end portion of the anchor portion and the reinforcing member are positioned on the plane. The vehicle body rear structure.

  The rear structure of the vehicle body described above is a rear pillar structure based on the anchor portion mounting position on 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 acts on the seat belt. Cross-section collapse can be suppressed, and a reduction in the restraining performance of the passenger due to the seat belt can be suppressed. The vehicle body rear structure of the vehicle has an anchor portion and one end portion and the other end portion of the reinforcing member when the cross section of the rear pillar is taken in a plane including the tension direction of the seat belt with the anchor portion attached to the inner panel as a base point. This is because the stress can be distributed to the reinforcing member even if the stress is concentrated on the anchor portion where the anchor is attached to the inner panel. Further, in the vehicle body rear structure of the vehicle, since the reinforcing member is directly joined to the outer panel, the stress distributed to the reinforcing member can be more efficiently distributed to the outer panel.

  When the vehicle includes a flip-up type back door, a stay member that assists the opening / closing operation of the back door is provided at each end in the vehicle width direction. The stay member is provided so as to bridge between the rear pillar that forms the back door opening of the vehicle body and the back door. When a vehicle is provided with a stay member, a reinforcement member for reinforcing the attachment portion is generally provided at an attachment portion of the stay member with respect to the rear pillar. The vehicle body rear structure of the vehicle suppresses the cross-sectional deformation of the rear pillar by setting the position of the reinforcing member at a specific position, and increases the thickness of the inner panel of the rear pillar, and the attachment of the anchor portion to the inner panel. There is no need to separately set a reinforcing member for reinforcing the location 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 the side view which looked at the rear pillar with which the vehicle body rear part structure of the vehicle concerning an embodiment is equipped from the vehicle inside. It is sectional drawing cut | disconnected by the (II)-(II) cutting line of FIG.

  A vehicle body rear part structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. In FIG. 1, the anchor part attached to the inner panel of a rear pillar is abbreviate | omitted. The same reference numerals in the figure indicate the same names. In the following description, “front”, “rear”, “right”, “left”, “upper”, and “lower” refer to the vehicle as viewed in the vehicle traveling direction with the occupant sitting on the seat The front is defined as “front”, which means a direction with reference to the front. In the figure, the arrow FR is the front side in the vehicle longitudinal direction, the arrow RR is the rear side, the arrow RH is the vehicle left-right direction (vehicle width direction) right side, and the arrow LH Indicates the left side, arrow UP indicates the upper side in the vehicle vertical direction, and arrow LWR indicates the lower side. The vehicle body rear structure is basically a symmetrical structure. In FIGS. 1 and 2, only the right side portion of the vehicle body rear structure is shown, and the left side portion is not shown.

〔overall structure〕
A 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 the rear pillar 10 more than the anchor portion 20 in the vehicle. And a reinforcing member 30 disposed on the rear side. The reinforcing member 30 is a member that reinforces the attachment portion of the stay member 2 that assists the opening / closing operation of the back door 4 with respect to the rear pillar 10. The vehicle body rear structure 1 of the vehicle according to the embodiment has a cross section of the rear pillar 10 in a plane including the tension direction of the seat belt (the 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 feature is that the anchor portion 20 and both end portions (the inner side end portion 31 and the 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 operation and effect will be described.

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

  As shown in FIG. 2, the rear pillar 10 includes an inner panel 11, an outer panel 12 that is spaced apart from the inner panel 11 in the vehicle width direction and forms a closed cross-sectional space 14 between the inner panel 11 and the inner panel 11. Is provided. 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 vehicle rear side. That is, in this example, a closed 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 a 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 on the front side of the vehicle, and the inner panel 11 and the back door opening panel 13 are joined directly 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 to be described later is attached to the inner panel 11. As shown in FIG. 1, a seating surface 110 is provided at a place 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 the 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 mounting portion of the anchor portion 20 with respect to the inner panel 11 is distributed to the corner portion, so that the rear pillar 10 It is easy to suppress cross-sectional collapse.

[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 side of the closed cross-section space 14 corresponding to the seat surface 110, and the anchor portion 20 is screwed to the nut plate 21 with a bolt 22.

(Reinforcing member)
The reinforcing member 30 is a member that reinforces the attachment portion (bracket 3) of the stay member 2 to the rear pillar 10 (in this example, the back door opening panel 13). The stay member 2 has an upper end joined to the upper part of the rear pillar 10 (back door opening panel 13) and a lower end joined to the inner panel of the back door 4 so as to bridge between the rear pillar 10 and the back door 4. , A member that assists the opening and closing operation of the back door 4. The stay member 2 is composed of, for example, a gas stay that includes a cylinder and a rod that is inserted into the cylinder so as to freely advance and retract. 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 side of the closed cross-sectional space 14 corresponding to the attachment location. The reinforcing member 30 includes an outer side end portion 32 that is directly joined to the outer panel 12, and an inner side end portion 31 that is joined directly or indirectly to the inner panel 11. In this example, the inner side end 31 of the reinforcing member 30 is directly joined to the back door opening panel 13 and 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 cross section of the rear pillar 10 is taken on a plane including the tension direction of the seat belt (the direction of the solid line arrow shown in FIGS. 1 and 2) with the anchor portion 20 as a base point, the reinforcing member 30 has an outer side end portion 32 and It is located on the plane including the inner end 31. The base point of the anchor part 20 here is an intersection of the inner panel 11 of the rear pillar 10 and the central axis of the bolt 22 that couples the anchor part 20 to the inner panel 11. A plane including the tension direction of the seat belt with the anchor portion 20 as a base point is a plane that intersects the vertical direction of the rear pillar 10. Moreover, the said plane is an inclined surface which cross | intersects a non-orthogonal with respect to a horizontal surface, and is a plane from which the intersection line with a horizontal surface turns into a line orthogonal to a tension | pulling direction. The reinforcing member 30 is positioned 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 plane. The pulling direction of the seat belt can be displaced within a certain range depending on the size of the passenger. The pulling direction of the seat belt referred to here is a general one that can prevent the occupant seated on the seat from moving forward from the surface of the inner panel 11 of the rear pillar 10 with the anchor portion 20 as a base point toward the vehicle inner side and downward. It is the direction of tension when the seat belt is in motion. The reinforcing member 30 is positioned on the plane including the outer side end portion 32 and the inner side end portion 31 in any plane including the tensile direction in consideration of the range in which the reinforcing member 30 can be displaced. It has such a size.

[Action and effect]
When an excessive inertia force acts on the occupant due to a frontal collision of the vehicle and a large tensile load acts on the seat belt, 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 in a plane including the tension 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 positioned 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 positioned 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. The 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 to 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 in this manner, so that the rear pillar 10 has a closed sectional space. It can suppress that it deform | transforms so that it may rotate to the said tensile direction side centering on the centroid C of 14, and can suppress that a cross-sectional collapse arises. Since the cross-sectional collapse of the rear pillar 10 can be suppressed, the occupant restraining performance by the seat belt can be ensured.

  When the vehicle is provided with the flip-up type back door 4, generally, the stay member 2 that assists the opening / closing operation of the back door 4 is attached to the rear pillar 10, and 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-section space 14 side of the rear pillar 10. The vehicle body rear structure 1 of the vehicle suppresses the collapse of the cross section of the rear pillar 10 by setting the arrangement of the reinforcing member 30 that is generally provided to a specific position. That is, the vehicle body rear structure 1 of the vehicle has a thicker inner panel 11 of the rear pillar 10 or a separate reinforcing member for reinforcing the attachment portion of the anchor portion 20 to the inner panel 11. There is no need to increase the strength and rigidity of the panel 11. Moreover, it is not necessary to enlarge the seating surface 110 provided at the attachment location of the anchor part 20 with respect to the inner panel 11 or the nut plate 21. Therefore, the vehicle body rear structure 1 of the vehicle can suppress the collapse of the cross section of the rear pillar 10 with a simple configuration, which is advantageous in terms of cost, weight, and productivity. Since the enlargement of the seating surface 110 can be suppressed, the vehicle body rear structure 1 of the vehicle can suitably use a seat belt with a pretensioner.

  The present invention is not limited to these exemplifications, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the 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 without an intervening member such as the back door opening panel 13. In this case, the reinforcing member 30 has the outer side end portion 32 directly joined to the outer panel 12 and the inner side end portion 31 joined directly to the inner panel 11.

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

Claims (1)

A rear pillar having an inner panel and an outer panel that forms a closed cross-sectional space between the inner panel;
An anchor portion attached to the inner panel and supporting a seat belt;
One end part directly joined to the outer panel and the other end part joined directly or indirectly to the inner panel, and disposed in the closed cross-section space on the vehicle rear side from the anchor part And a reinforcing member that reinforces the attachment portion of the stay member for assisting in opening and closing the back door with respect to the rear pillar,
When the cross section of the rear pillar is taken in a plane including the tension direction of the seat belt with the anchor portion as a base point, the one end portion and the other end portion of the anchor portion and the reinforcing member are positioned on the plane. The vehicle body rear structure.

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