JP5571527B2 - Rear body structure of automobile - Google Patents

Description

  The present invention relates to a rear vehicle body structure including a rear pillar extending in a vehicle vertical direction and a wheel house connected to a lower end portion of the rear pillar and covering a rear wheel.

  In an automobile, from the viewpoint of increasing the supporting strength against a load acting on a seat belt device that restrains an occupant seated on a rear seat and a seat back striker that locks the rear seat back to a seating position, The anchor attachment portion, the retractor attachment portion, and the seat back striker attachment portion are set at the overlapping portion of the rein hose and the pillar inner panel disposed in the rear pillar.

  Further, from the viewpoint of reducing the weight of the rear pillar, in Patent Document 3, the pillar inner panel is omitted by configuring the rear pillar by a pillar outer panel and a plurality of rein hoses, and the above-described attachment portions are provided in each rein hose.

Japanese Patent Laid-Open No. 10-2108030 JP 10-59214 A JP 2010-52627 A

  By the way, in a small vehicle in which weight reduction and cost reduction are strongly desired, the structure in which the attachment portion is set in the overlapping portion of the rear pillar inner and the rein hose as in Patent Documents 1 and 2, the vehicle weight and the increase in the number of parts. It is difficult to adopt because it increases the cost.

  On the other hand, in the case of a structure in which a mounting portion is provided in each rein hose without using a pillar inner panel as in Patent Document 3, the weight and cost of the rear pillar can be suppressed as compared with the case in which the rein hose is provided. Therefore, there is a problem that the weight and cost increase as the number of parts increases. In particular, the structure of Patent Document 3 is effective for a wagon car with a high roof position, but in a small car with a low vehicle height, the vertical distance between a rein hose having a belt anchor attachment part and a rein hose having a retractor attachment part is small. When the seat back striker attachment portion is set, it is necessary to newly add a rein hose. Eventually, there is no difference from providing a single pillar inner panel having a rein hose function. Therefore, in a small vehicle where weight reduction and cost reduction are strongly desired, examination of an optimum structure that can reduce the weight and cost of the vehicle body while ensuring the strength of each mounting portion is demanded.

  The present invention has been made in view of the above-described conventional situation, and it is possible to secure the strength of the belt anchor mounting portion, the retractor mounting portion, and the seat back striker mounting portion while reducing the weight and cost of the rear pillar. An object is to provide a vehicle body structure.

  The present invention is a rear vehicle body structure including a rear pillar extending in a vehicle vertical direction and a wheel house connected to a lower end portion of the rear pillar and covering an upper portion of a rear wheel, and the rear pillar includes a pillar outer panel, The pillar outer hose is formed with a pillar rein hose disposed on the inner side of the pillar outer panel, and the pillar rein hose has a belt anchor attachment portion, and a rear door opening is formed by a front edge thereof, and a back door opening is formed by a rear edge. An upper member, and a seatback striker mounting portion, the upper edge portion of which is connected to the upper member, the lower edge portion is connected to the upper edge portion of the wheel house, and the front edge thereof opens the rear door opening. A first lower member to be formed, and disposed rearward of the first lower member, the upper edge portion of which is the upper member and the lower edge portion of the wheel housing. A second lower member that is connected to the upper edge of each of the doors and forms a back door opening by a rear edge thereof, and the first and second lower members have the upper edge of the wheel house as the bottom. And a retractor mounting portion is provided in a portion of the upper edge of the wheel house located in the space.

  In the rear vehicle body structure according to the present invention, a rear pillar is formed by a pillar outer panel and a pillar rein hose, and the pillar rein hose is formed by an upper member having a belt anchor attachment portion, and a first lower member having a seatback striker attachment portion. And a second lower member arranged behind the first lower member, and the first and second lower members are arranged so as to form a substantially triangular space with the upper edge of the wheel house as the bottom. The retractor mounting portion is provided in the empty space at the upper edge of the wheel house.

  Since the rear pillar is formed with the pillar outer panel and the pillar rein hose in this way, the pillar inner panel can be omitted, and the weight and cost of the rear pillar can be reduced, and as a result, it can be adopted in a small vehicle where weight reduction and cost reduction are desired. Become.

  Further, since the belt anchor attaching portion and the seat back striker attaching portion are provided on the upper member and the first lower member, which have high strength, the necessary strength against the load acting on these attaching portions can be ensured.

  In the present invention, since the retractor mounting portion is provided in the triangular space surrounded by the first and second lower members at the upper edge of the wheel house, the load acting on the retractor mounting portion is applied to the first and second lower portions. It can be received efficiently by the member. As a result, it is possible to eliminate the need for a new rein hose for forming the retractor mounting part, and from this point of view, the weight and cost of the rear pillar can be suppressed, and it can be used for small vehicles that are strongly demanded for weight reduction and cost reduction. It becomes possible.

1 is a side view of a rear vehicle body according to a first embodiment of the present invention. It is a rear view of the said rear vehicle body. It is a side view of the pillar inner panel of the rear pillar of the rear vehicle body. It is sectional drawing (IV-IV sectional view taken on the line of FIG. 1) of the said rear pillar. It is sectional drawing (VV sectional view taken on the line of FIG. 1) of the said rear pillar. It is sectional drawing (the VI-VI sectional view taken on the line of FIG. 1) of the wheel house connection part of the said rear pillar. It is sectional drawing (the VII-VII sectional view taken on the line of FIG. 1) of the retractor attachment part of the said wheel house.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 7 are views for explaining a rear body structure of an automobile according to a first embodiment of the present invention. In the description of the present embodiment, the terms front / rear and left / right mean front / rear and left / right when viewed in the vehicle traveling direction while seated on a seat mounted on the vehicle, unless otherwise specified.

  In the figure, reference numeral 1 denotes a rear body of the automobile. The rear vehicle body 1 includes left and right rear pillars 2 and 2 extending in the vehicle vertical direction, a rear header panel 3 extending between the upper ends of the left and right rear pillars 2 extending in the vehicle width direction, and a lower end. A back door opening 1a is formed by the lower back panel 4 extending in the vehicle width direction. A back door 5 that opens and closes in the vertical direction is disposed in the back door opening 1a.

  The rear vehicle body 1 includes the left and right rear pillars 2 and a wheel house 10 that is connected to lower ends of the left and right rear pillars 2 and covers an upper portion of a rear wheel (not shown).

  The rear end of the roof rail panel 6 extending in the vehicle front-rear direction is connected to the upper ends of the left and right rear pillars 2, and the rocker panel 7 extending in the vehicle front-rear direction is connected to the lower end of the wheel house 10. The rear end is connected. A rear door opening 1b is formed by the rear pillar 2, the roof rail panel 6, the rocker panel 7, the wheel house 10, and a center pillar (not shown). The rear door opening 1b is provided with a rear door 8 that opens and closes in the vehicle width direction or the vehicle front-rear direction.

  The wheel house 10 has a structure in which a wheel outer panel 29 disposed on the outer side in the vehicle width direction and an upper flange portion (upper edge portion) 10a of a wheel inner panel 30 disposed on the inner side are joined together by welding (see FIG. 6).

  A lower edge portion 11 a of the pillar outer panel 11 of the rear pillar 2 is coupled to the lower edge portion 29 a of the wheel outer panel 29.

  An outer flange portion 31a of a support bracket 31 that supports a shock absorber (not shown) is joined to the upper flange portion 10a of the rear portion of the wheel outer panel 29 by welding (see FIG. 7).

  The left and right rear pillars 2 have a structure in which the outer peripheral edge portions of the pillar outer panel 11 as an exterior member and the pillar rein hose 12 disposed on the indoor side of the pillar outer panel 11 are joined to form a hollow shape. Have As a result, the pillar inner panel is omitted. The plate thickness of the pillar rein hose 12 is set larger than the plate thickness of the pillar outer panel 11.

  The pillar rein hose 12 has a rear door opening 1b formed by a front edge thereof, an upper member 13 forming a back door opening 1a by a rear edge thereof, an upper edge portion 14a of the upper member 13 and a lower edge portion 14b of a lower edge portion 14b thereof. A first lower member 14 connected to the upper flange portion 10a of the wheel house 10 and forming the rear door opening 1b by a front edge thereof, and disposed at the vehicle rear side of the first lower member 14, and an upper edge portion thereof The lower member 15a is connected to the upper member 13 and the lower edge portion 15b is connected to the upper flange portion 10a of the wheel house 10 and the second lower member 15 that forms the back door opening 1a by its rear edge. .

  The upper member 13 and the first and second lower members 14 and 15 are manufactured by press molding, and are integrally coupled by welding.

  The upper member 13 is generally trapezoidal when viewed from the side of the vehicle. A roof joint 13d that protrudes forward of the vehicle is formed at the upper end of the upper member 13 on the rear door opening side, and the roof rail panel 6 is connected to the roof joint 13d. A flange portion 13e is formed at the upper end of the upper member 13 on the back door opening side, and the rear header panel 3 is connected to the flange portion 13e.

  The upper member 13 includes a belt-shaped inclined bead 13g extending downwardly from a connection portion with the rear header panel 3, a horizontal bead 13h extending in the front-rear direction at a lower portion of the inclined bead 13g, A vertical bead 13i is formed extending in the vertical direction on the rear side of the bead 13h and the inclined bead 13g. The inclined beads 13g, the horizontal beads 13h, and the vertical beads 13i are arranged so as to form a substantially triangular shape, thereby increasing the rigidity of the entire pillar rein hose 12 including the upper member 13 in the vertical direction. That is, the upper side corner portion 1c of the back door opening 1a expands and contracts in the diagonal direction due to repeated pushing loads from the road surface transmitted through the rear wheel (see the two-dot chain line in FIG. 2). The rigidity of the upper side corner portion 1c with respect to such a pushing load is ensured.

  The upper member 13 is formed with a belt anchor mounting portion 13g 'bulging indoors. The belt anchor attachment portion 13g 'is disposed at the center of the upper member 13, and is formed integrally with the lower end portion of the inclined bead 13g so as to form a circular shape. A belt anchor 23 is attached to the belt anchor attaching portion 13g ′ by a bolt 24 (see FIG. 5).

  The belt anchor 23 is for guiding and supporting a webbing 27 unwound from a retractor 26 described later to an occupant seated on the rear seat. The lateral beads 13h are inclined slightly forward and downward so as to substantially coincide with the belt anchor input direction F1 acting on the belt anchor mounting portion 13g '(see FIG. 3).

  At the upper end of the first lower member 14, a seat back striker mounting portion 14c is formed to bulge indoors. A base plate 34 is attached and fixed to the attachment portion 14c, and a striker 33 protruding to the indoor side is fixed to the base plate 34.

  A hook 36a of a lock member 36 attached to the seat back 35a of the rear seat 35 is detachably engaged with the striker 33 (see FIG. 4). Here, the striker 33 has a strength for preventing the seat back 35a from being tilted forward by the impact force F2 when the vehicle strikes from behind the vehicle.

  The seat back striker mounting portion 14c is formed with two front beads 14d and 14d extending forward of the vehicle and a lower bead 14e extending downward following the mounting portion 14c.

  Each front bead 14d extends so as to be close to the edge of the rear door opening 1b, and the lower bead 14e extends so as to be close to the upper flange portion 10a of the wheel house 10.

  The first lower member 14 is formed so that the front edge and the rear edge of the front lower portion forming the rear door opening 1b are substantially parallel, and has a substantially parallelogram as a whole.

  Between the front bead 14d and the lower bead 14e of the first lower member 14, there is formed a lightening hole 14f having a size extending over the entire area.

  The second lower member 15 is formed so as to form a substantially straight line following the side portion of the upper member 13 on the back door opening side, and the lower edge portion 15b of the second lower member 15 together with the upper flange portion 10a of the wheel house 10 is formed. The wheel house 10 and the lower back panel 4 are coupled to an extension panel 38 (see FIG. 1).

  The first and second lower members 14 and 15 are arranged so as to form a substantially triangular space 16 having the upper flange portion 10a of the wheel house 10 as a base. Specifically, the first and second lower members 14 and 15 are arranged so that the front and rear intervals are narrowed toward the upper side, and the wheel house 10, the upper member 13, and the first and second lower members 14 and 15. The void 16 is surrounded.

  A retractor mounting portion 10 a ′ is provided in a portion of the upper flange portion 10 a of the wheel house 10 located in the space 16. The retractor mounting portion 10a 'is in contact with the outer flange portion 31a of the support bracket 31 described above, and three retractor brackets 28 are overlapped and joined to the outer flange portion 31a and the retractor mounting portion 10a' by welding. (See FIG. 7). The retractor 26 is attached and fixed to the retractor bracket 28 with bolts 28a.

  The retractor 26 winds up the webbing 27 in the storage direction at all times while allowing the webbing 27 to be freely inserted and removed in a normal use state, and locks the webbing 27 so that it cannot move in the event of a vehicle collision. The passenger is restrained.

  According to the present embodiment, the rear pillar 2 is formed by the pillar outer panel 11 and the pillar rein hose 12 disposed on the inner side of the pillar outer panel 11, and the pillar rein hose 12 is an upper member having the belt anchor attachment portion 13g '. 13, a first lower member 14 having a seatback striker mounting portion 14 c, and a second lower member 15 disposed behind the first lower member 14, and the first and second lower members 14, 15 are It arrange | positions so that the substantially triangular space 16 which makes the upper flange part 10a of the wheel house 10 a base may be formed, and the retractor attaching part 10a 'may be located in the part located in the space 16 of the upper flange part 10a of the wheel house 10. The configuration was provided.

  Since the rear pillar 2 is formed by the pillar outer panel 11 and the pillar rein hose 12 in this way, the pillar inner panel can be omitted, the weight and cost of the rear pillar 2 can be reduced, and the light weight and cost reduction are desired. Adoption is possible.

  Further, since the belt anchor mounting portion 13g 'and the seat back striker mounting portion 14c are formed on the upper member 13 and the first lower member 14 having high strength, respectively, a forward tensile load acting on these mounting portions 13g' and 14c is prevented. Necessary strength can be ensured.

  In the present embodiment, since the retractor mounting portion 10a 'is provided in the triangular space 16 of the upper flange portion 10a of the wheel house 10, an upward tensile load acting on the retractor mounting portion 10a' is applied. It can be received efficiently by the first and second lower members 141, 15. As a result, it is possible to eliminate the need for a new rein hose for forming the retractor mounting portion. From this point, the weight and cost of the rear pillar 2 can be suppressed, and the adoption to a small vehicle that is strongly demanded for weight reduction and cost reduction. Is possible.

  In the present embodiment, since the first lower member 14 has a substantially parallelogram shape, the yield at the time of press molding can be improved.

  Since the front bead 14d extending forward and the lower bead 14e extending downward are formed in the seat back striker mounting portion 14c of the first lower member 14, the input F2 from the striker 33 is used as the front bead 14d and the lower bead. 14e, and stress concentration on the striker 33 can be avoided.

  Further, since the lower bead 14e extends along the rear edge of the first lower member 13, it is possible to contribute to an increase in strength of the retractor mounting portion 10a '.

  Furthermore, since the lightening hole 14f is formed in the first lower member 14, the weight of the entire rear pillar 12 can be reduced accordingly.

1 Rear body 2 Rear pillar 10 Wheel house 10a Upper flange (upper edge)
10a 'retractor attachment part 11 pillar outer panel 12 pillar rein hose 13 upper member 13g' belt anchor attachment part 14 first lower member 14a upper edge part 14b lower edge part 14c seedback striker attachment part 15 second lower member 15a upper edge part 15b Lower edge 16 void

Claims (1)

A vehicle rear body structure comprising a rear pillar extending in a vehicle vertical direction and a wheel house connected to a lower end portion of the rear pillar and covering an upper part of a rear wheel,
The rear pillar is formed by a pillar outer panel and a pillar rein hose disposed on the inner side of the pillar outer panel,
The pillar rein hose has a belt anchor attachment portion, and forms a rear door opening by a front edge thereof, and an upper member forming a back door opening by a rear edge;
A first lower member having a seatback striker mounting portion, an upper edge portion connected to the upper member, a lower edge portion connected to the upper edge portion of the wheel house, and a rear door opening formed by the front edge thereof; ,
A second lower member disposed rearward of the first lower member, having an upper edge connected to the upper member, a lower edge connected to the upper edge of the wheel house, and a rear door forming a back door opening. Composed of members,
The first and second lower members are arranged so as to form a substantially triangular space having an upper edge of the wheel house as a base,
A rear body structure of an automobile, wherein a tritractor mounting portion is provided in a portion of the upper edge portion of the wheel house located in the space.

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