JP2014169046A - Vehicle body rear part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure necessary rigidity and strength, and to reduce vehicle body weight.SOLUTION: A rear pillar 14 is formed of a rear pillar outer 26 and a rear pillar inner 28. The rear pillar inner 28 has a rear pillar inner lower 32 and a rear pillar inner upper, the rear pillar inner lower 32 has a lower swollen part 40, and the rear pillar inner upper has an upper front wall. A first closed cross section part 42 formed by bonding the rear pillar outer 26 and the lower swollen part 40, a lap part where an upper end of the rear pillar inner lower 32 and a lower end of the rear pillar inner upper are overlapped by overlapping the rear pillar inner upper from the front side and the vehicle width central side with respect to the rear pillar inner lower 32, and a second closed cross section part disposed between the lower swollen part 40 and the upper front wall in the lap part, are provided in the rear pillar 14.

Description

  The present invention relates to a rear pillar vehicle body rear structure.

  For example, Patent Document 1 describes that a stiffener is provided on the back surface of a portion where a striker is attached to the front end wall of a rear pillar, and this stiffener is formed in an L-shaped cross section extending rearward by contacting the rear pillar inner. Yes.

  In Patent Document 1, it is said that the rigidity around the striker of the rear pillar can be increased by reinforcing with a stiffener, and the rigidity and strength of the rear part of the vehicle body can be improved.

JP 7-329827 A

  However, by using the stiffener, the rigidity and strength of the rear portion of the vehicle body can be improved, but the weight of the stiffener itself is added to the vehicle body, so that the vehicle body weight increases accordingly.

  On the other hand, in order to reduce the weight of the vehicle body, for example, it is conceivable to omit the stiffener. However, since the stiffener is eliminated, it becomes difficult to ensure the necessary rigidity and strength in the rear structure of the vehicle body.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle body rear structure capable of ensuring necessary rigidity and strength and reducing the vehicle weight.

  In order to achieve the above object, the present invention provides a vehicle body rear structure having a rear pillar that constitutes a side edge of an opening of a vehicle body rear portion, and the rear pillar extends in a vehicle width direction and constitutes a rear surface of the rear pillar. A rear pillar inner that is joined to the rear pillar outer, the rear pillar inner includes a rear pillar inner lower that constitutes a lower portion of the rear pillar, and a rear pillar inner upper that constitutes an upper portion of the rear pillar, The rear pillar inner lower extends from the vehicle width center side end of the rear pillar outer to the front side and forms a vehicle width center side surface of the rear pillar, and extends from the front end of the lower side wall to the vehicle width outside and extends from the front end of the rear pillar. A lower front wall that constitutes the front surface, and a lower bulging portion that bulges the lower front wall toward the rear side of the vehicle body. The rear pillar inner upper extends forward from a vehicle width center side end portion of the rear pillar outer to constitute a vehicle width center side surface of the rear pillar, and extends from the front end of the upper side wall to the vehicle width outside and extends to the rear pillar. An upper front wall that constitutes the front surface of the rear pillar, and a first closed cross-section portion formed by joining the rear pillar outer and the lower bulge portion; and the rear pillar inner upper portion forward of the rear pillar inner lower portion And a lap portion in which the upper end of the rear pillar inner lower and the lower end of the rear pillar inner upper overlap with each other, and in the wrap portion, between the lower bulging portion and the upper front wall. And a second closed cross-sectional portion provided on the surface.

  According to the present invention, the lower bulge portion of the rear pillar inner lower is joined to the rear pillar outer to form the first closed cross section, thereby eliminating the stiffener required for reinforcing the rear pillar in the prior art. Even in this case, the rigidity and strength of the rear pillar necessary for the rear structure of the vehicle body can be ensured, and the vehicle body weight can be reduced by the amount of the stiffener.

  In this embodiment, the rear pillar inner upper is overlapped from the front side and the vehicle width center side of the rear pillar inner lower to form a lap portion, and the second lap portion is formed between the lower bulging portion and the upper front wall. By forming the closed cross section, the rigidity and strength of the rear pillar can be further increased.

  Further, the present invention is characterized in that a joint portion between the lower bulge portion and the rear pillar outer is located below the lap portion.

  If the lower bulge and the rear pillar outer are to be joined at a position above the lap, for example, in order to perform spot welding using a spot welding gun, the tip of the welding gun can be inserted. It is necessary to increase the distance between the lower bulge and the rear pillar outer. For this reason, if the separation distance between the lower bulging portion and the rear pillar outer is increased, the width of the rear pillar in the vehicle front-rear direction is increased. On the other hand, according to the present invention, the width of the rear pillar in the vehicle front-rear direction can be reduced by positioning the joint portion below the lap portion.

  Furthermore, the present invention is characterized in that the rear pillar inner upper is joined to the rear pillar inner lower with the lower bulging portion interposed therebetween.

  According to the present invention, the rigidity and strength of the rear pillar are further increased by joining the rear pillar inner upper and the rear pillar inner lower with the second closed cross section formed by the lower bulging portion sandwiched in the vehicle width direction. Can do.

  Furthermore, the present invention is characterized in that an inclined portion is provided between the lower front wall and the lower bulge portion.

  According to the present invention, by providing the inclined portion in the rear pillar inner lower, it is possible to avoid a sudden change in rigidity between the lower front wall and the lower bulged portion, and an external force is applied to the rear pillar. It is possible to suppress stress concentration when

  Furthermore, the present invention is characterized in that a through hole for harness routing is provided in the inclined portion.

  According to the present invention, the through hole can be provided at a position where the separation distance between the rear pillar inner lower and the rear pillar outer is smaller than that of the other portion by the inclined portion, and the harness arrangement work can be easily performed. it can.

  Furthermore, in the present invention, a patch joined to the outer side surface of the rear pillar inner upper of the rear pillar inner upper is provided above the lap portion, and the rear pillar inner upper and the patch constitute a third closed section. It is characterized by.

  According to the present invention, the patch is joined to the outer side surface of the rear pillar inner upper, which is a portion where the rear pillar inner lower and the rear pillar inner upper do not overlap, and the third closed cross section is formed between the rear pillar inner upper and the patch. By configuring, the rigidity and strength of the rear pillar can be further increased.

  According to the present invention, it is possible to obtain a vehicle body rear structure capable of ensuring necessary rigidity and strength and reducing the vehicle body weight.

It is the perspective view which looked at the vehicle rear part to which the vehicle body rear part structure concerning embodiment of this invention was applied from the vehicle interior. FIG. 2 is a partially enlarged perspective view of FIG. 1. It is the perspective view which looked at the vehicle rear part which removed the rear pillar outer from the vehicle rear back. FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 2. FIG. 5 is a cross-sectional view taken along line VV in FIG. 2. It is a cross-sectional view along the VI-VI line of FIG. (A) is an end view along the IV-IV line of the rear pillar in this embodiment, and (b) is an end view of the rear pillar in the comparative example devised by the present applicant. It is the schematic diagram which showed the 1st closed cross-section part shown in FIG. 4 and the 2nd closed cross-section part shown in FIG. 5 on the same plane for convenience.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a perspective view of a rear part of a vehicle to which a vehicle body rear part structure according to an embodiment of the present invention is applied, viewed from the interior of the vehicle, FIG. 2 is a partially enlarged perspective view of FIG. 1, and FIG. It is the perspective view which looked at the rear part from the back outside a vehicle. Note that “front and rear” and “up and down” indicated by arrows in each figure indicate the front and rear direction and the vertical direction of the vehicle body, and “left and right” indicate the left and right direction (vehicle width direction) as viewed from the driver seat. ing.

  As shown in FIGS. 1 and 2, the vehicle 10 has an opening (tailgate opening) 12 at the rear of the vehicle body that is opened and closed by a back door (tailgate) (not shown). A pair of rear pillars 14 and 14 constituting side edges are provided. In FIG. 1, only the right rear pillar 14 of the vehicle 10 of the pair of rear pillars 14, 14 is illustrated, and the left rear pillar 14 is not illustrated.

  The vehicle 10 also has a rear door opening 20 at the rear of the vehicle body that is opened and closed by a rear door (not shown). The rear door opening 20 is formed by a roof 16 and a center pillar 18 that are joined to the upper end of the rear pillar 14 and extend toward the front of the vehicle body. A rear end panel 22 to which the lower end portion of the rear pillar 14 is joined and a rear wheel house inner 24 to which the lower end portion of the rear end panel 22 is joined are disposed on the lower side of the rear pillar 14.

  4 is a cross-sectional view taken along line IV-IV in FIG. 2, FIG. 5 is a cross-sectional view taken along line V-V in FIG. 2, and FIG. 6 is taken along line VI-VI in FIG. It is a cross-sectional view.

  The rear pillar 14 extends substantially in the vertical direction, and a rear pillar outer 26 on the vehicle exterior side and a rear pillar inner 28 on the vehicle compartment side are integrally joined. As shown in FIG. 4, the rear pillar outer 26 extends in the left-right direction (vehicle width direction) and constitutes the rear surface of the rear pillar 14. One end portion (outer end portion in the vehicle width direction) along the left-right direction of the rear pillar outer 26 is joined to a side outer panel 30 formed separately from the rear pillar outer 26.

  As shown in FIG. 2, the rear pillar inner 28 has a rear pillar inner lower 32 constituting the lower part of the rear pillar 14 and a rear pillar inner upper 34 constituting the upper part of the rear pillar 14 as separate bodies.

  As shown in FIG. 4, the rear pillar inner lower 32 includes a lower side wall 36 that extends forward from the vehicle width central side end portion 26 a of the rear pillar outer 26 and constitutes a vehicle width central side surface of the rear pillar 14, and a lower side wall 36. A lower front wall 38 that extends from the front end in the vehicle width direction (vehicle width outer side) to form the front surface of the rear pillar 14, and a lower bulging portion 40 that bulges the lower front wall 38 toward the rear side of the vehicle body. Prepare.

  As shown in FIG. 4, the concave bottom surface portion 26b of the rear pillar outer 26 that is recessed toward the front of the vehicle as viewed from the rear of the vehicle and the lower bulging portion 40 are joined by, for example, spot welding to form a joint 52. Thus, the first closed cross-section portion 42 having a closed cross section is formed in a cross section substantially orthogonal to the axis of the rear pillar 14.

  As shown in FIG. 5, the rear pillar inner upper 34 extends from the vehicle width central side end portion 26 a of the rear pillar outer 26 to the front side, and constitutes the vehicle side central side surface of the rear pillar 14. An upper front wall 46 that extends from the front end to the vehicle width outside and forms the front surface of the rear pillar 14 is provided.

  Returning to FIG. 2, the rear pillar inner upper 34 is overlapped with the rear pillar inner lower 32 from the front side and the vehicle width center side so that the upper end portion of the rear pillar inner lower 32 and the lower end portion of the rear pillar inner upper 34 overlap each other. A portion 48 is provided. As shown in FIG. 5, the wrap portion 48 is provided with a second closed cross-section portion 50 between the lower bulging portion 40 and the upper front wall 46.

  The second closed cross section 50 has a closed cross section in a cross section substantially orthogonal to the axis of the rear pillar 14, and welds the vehicle front end portion 32a of the lower bulge portion 40 and the vehicle front end portion 34a of the upper front wall 46. At the same time, the vehicle rear end portion 32b of the lower side wall 36 and the vehicle rear end portion 34b of the upper side wall 44 are joined to form a square cross section. In the cross section shown in FIG. 5, the rear pillar inner upper 34 is joined to the rear pillar inner lower 32 with the second closed section 50 formed by the lower bulging portion 40 sandwiched in the vehicle width direction.

  On the vehicle rear side in FIG. 5, the vehicle body center side end portion 26 a of the rear pillar outer 26 extending along the left-right direction, the vehicle rear end portion 32 b of the rear pillar inner lower 32, and the vehicle rear end of the rear pillar inner upper 34. Three parts with the part 34b are integrally joined.

  A joint portion 52 (see FIG. 4) between the lower bulging portion 40 and the rear pillar outer 26 is positioned below the lap portion 48 (see FIG. 2). In other words, the first closed cross-section portion 42 is located below the second closed cross-section portion 50 in the vertical direction.

  As shown in FIG. 4, an inclined portion 54 is provided between the lower front wall 38 and the lower bulging portion 40. As shown in FIG. 2, the inclined portion 54 is provided with a through hole 56 for harness arrangement that is substantially circular in a side view. The through hole 36 is formed through the rear pillar inner lower 32 and the rear pillar outer 26.

  As shown in FIG. 3, a rear pillar anchor patch (patch) 58 is provided above the lap portion 48 so as to be joined to the vehicle interior side surface 59 of the rear pillar inner upper 34. As shown in FIG. 6, the rear pillar inner upper 34 and the rear pillar anchor patch 58 constitute a third closed cross section 60.

  The third closed cross section 60 has a closed cross section in a cross section substantially orthogonal to the axis of the rear pillar 14, and welds the inclined side wall 34c of the rear pillar inner upper 34 and one end 58a of the rear pillar anchor patch 58 on the vehicle front side. In addition, the vehicle rear end portion 34b of the rear pillar inner upper 34 and the vehicle rear end portion 58b of the rear pillar anchor patch 58 are joined to form a substantially triangular cross section.

  6, the vehicle body center side end portion 26a of the rear pillar outer 26 extending in the left-right direction, the vehicle rear end portion 58b of the rear pillar anchor patch 58, and the vehicle rear end of the rear pillar inner upper 34 are provided. Three parts with the part 34b are integrally joined.

  The vehicle 10 to which the vehicle body rear part structure according to the present embodiment is applied is basically configured as described above. Next, the function and effect will be described.

  FIG. 7A is an end view taken along the line IV-IV of the rear pillar in the present embodiment, and FIG. 7B is an end view of the rear pillar in the comparative example devised by the present applicant.

  In the rear pillar 100 in the comparative example devised by the present applicant, a closed section 108 is formed between the rear pillar inner 104 and the stiffener 106 without forming a closed section between the rear pillar outer 102 and the rear pillar inner 104. ing. In the comparative example, by forming the closed cross section 108 between the rear pillar inner 104 and the stiffener 106, desired rigidity and strength can be ensured, but the weight of the entire rear pillar 100 increases by the weight of the stiffener 106. .

  On the other hand, in this embodiment, the lower bulging portion 40 of the rear pillar inner lower 32 is joined to the rear pillar outer 26 to form the first closed cross-section portion 42, whereby the closed cross-section 108 of the rear pillar 100 is formed in the comparative example. Even when the stiffener 106 required for the configuration is eliminated, the rigidity and strength of the rear pillar 14 required in the rear structure of the vehicle body can be secured, and the vehicle body weight is reduced by the weight of the stiffener 106. can do.

  In the present embodiment, the rear pillar inner upper 34 is overlapped from the front side of the rear pillar inner lower 32 and the vehicle width center side to form a lap portion 48, and the lower bulging portion 40 and the upper front wall 46 are formed in the wrap portion 48. By forming the second closed cross-section portion 50 therebetween, the rigidity and strength of the rear pillar 14 can be further increased. In the lap portion 48, the rear pillar inner upper 34 is located on the outer side, and the rear pillar inner lower 32 is located on the inner side.

  FIG. 8 is a schematic view for convenience showing the first closed cross-section portion shown in FIG. 4 and the second closed cross-section portion shown in FIG. 5 on the same plane.

  In the present embodiment, a first closed cross-section portion 42 positioned below and a second closed cross-section portion 50 positioned above the first closed cross-section portion 42 by a predetermined distance in the vertical direction of the rear pillar 14 are respectively disposed. ing. For this reason, the first closed cross-section portion 42 and the second closed cross-section portion 50 that are positioned in the vertical direction work together at the connecting portion between the rear pillar inner 28 and the rear pillar upper 26, thereby further increasing the rear pillar 14. Stiffness and strength can be improved.

  Furthermore, in the present embodiment, the joint portion 52 between the lower bulging portion 40 and the rear pillar outer 26 is set to be positioned below the lap portion 48. If the lower bulging portion 40 and the rear pillar outer 26 are to be joined at a position above the lap portion 48, for example, in order to perform spot welding using a spot welding gun (not shown), the tip of the welding gun is inserted. In order to make this possible, it is necessary to increase the distance between the lower bulging portion 40 and the rear pillar outer 26. For this reason, if the separation distance between the lower bulging portion 40 and the rear pillar outer 26 is increased, the width of the rear pillar 14 in the vehicle front-rear direction is increased. On the other hand, in the present embodiment, the width of the rear pillar 14 in the vehicle front-rear direction can be reduced by positioning the joint portion 52 below the lap portion 48.

  Furthermore, in the present embodiment, the rigidity and strength of the rear pillar 14 are further increased by joining the rear pillar inner upper and the rear pillar inner lower with the second closed cross section formed by the lower bulging portion sandwiched in the vehicle width direction. It can be further enhanced. That is, in the cross section shown in FIG. 5, one joint portion between the vehicle front end portion 32 a of the lower bulging portion 40 and the vehicle front end portion 34 a of the upper front wall 46 and the vehicle rear end portion 32 b of the lower side wall 36. The second closed cross-section portion 50 is disposed along the vehicle width direction between the first and second vehicle rear end portions 34b of the upper side wall 44, thereby further increasing the rigidity and strength of the rear pillar 14. be able to.

  Furthermore, in this embodiment, by providing the rear pillar inner lower 32 with the inclined portion 54, a sudden change in rigidity between the lower front wall 38 and the lower bulging portion 40 can be avoided, and an external force is applied. It is possible to suppress stress concentration when it is applied.

  Furthermore, in the present embodiment, the inclined portion 54 can provide the through-hole 56 at a position where the separation distance between the rear pillar inner lower 32 and the rear pillar outer 26 is small compared to other parts, and the harness routing work Can be easily performed.

  Furthermore, in the present embodiment, the rear pillar anchor patch 58 is joined to the non-wrapped portion where the rear pillar inner lower 32 and the rear pillar inner upper 34 do not overlap to form the third closed cross-section portion 60, whereby the rigidity of the rear pillar 14 is increased. -Strength can be further increased.

  Furthermore, in the present embodiment, the first closed cross-section portion 42 is disposed at a lower position with the second closed cross-section portion 50 provided in the lap portion 48 therebetween, and the third closed cross-section portion is disposed at an upper position thereof. 60 are arranged. As a result, the plurality of first to third closed cross-section portions 42, 50, 60 respectively arranged along the vertical direction cooperate with each other, whereby the rigidity and strength of the rear pillar 14 can be further improved.

10 Vehicle 12 Opening (Opening at the rear of the vehicle body)
14 Rear Pillar 26 Rear Pillar Outer 28 Rear Pillar Inner 32 Rear Pillar Inner Lower 34 Rear Pillar Inner Upper 36 Lower Side Wall 38 Lower Front Wall 40 Lower Expanded Part 42 First Closed Cross Section 44 Upper Side Wall 46 Upper Front Wall 48 Lap Part 50 Second Closed Cross Section 52 Joining part 54 Inclined part 56 Through hole (through hole for harness arrangement)
58 Rear pillar anchor patch (patch)
60 Third closed section

Claims (6)

A vehicle body rear structure having a rear pillar that constitutes a side edge of an opening of a vehicle body rear portion,
The rear pillar includes a rear pillar outer that extends in the vehicle width direction and forms a rear surface of the rear pillar, and a rear pillar inner that is joined to the rear pillar outer.
The rear pillar inner includes a rear pillar inner lower that constitutes a lower part of the rear pillar, and a rear pillar inner upper that constitutes an upper part of the rear pillar,
The rear pillar inner lower extends forward from a vehicle width center side end portion of the rear pillar outer to form a vehicle width center side surface of the rear pillar, and extends from the front end of the lower side wall to the vehicle width outside and extends to the rear pillar. A lower front wall that constitutes the front of the lower front wall, and a lower bulging portion that bulges the lower front wall toward the rear side of the vehicle body,
The rear pillar inner upper extends forward from a vehicle width center side end portion of the rear pillar outer to constitute a vehicle width center side surface of the rear pillar, and extends from the front end of the upper side wall to the vehicle width outside and extends to the rear pillar. An upper front wall constituting the front of the
A first closed cross-section portion formed by joining the rear pillar outer and the lower bulge portion;
A lap portion where the upper end of the rear pillar inner lower and the lower end of the rear pillar inner upper overlap with each other by overlapping the rear pillar inner upper from the front side and the vehicle width center side with respect to the rear pillar inner lower,
A second closed cross-sectional portion provided between the lower bulging portion and the upper front wall in the wrap portion;
A vehicle body rear structure characterized by comprising: The vehicle body rear structure according to claim 1,
The vehicle body rear part structure characterized in that a joint part between the lower bulge part and the rear pillar outer is located below the lap part. In the vehicle body rear part structure according to claim 1 or claim 2,
The rear pillar inner structure is characterized in that the rear pillar inner upper is joined to the rear pillar inner lower with the lower bulging portion interposed therebetween. The vehicle body rear structure according to any one of claims 1 to 3,
A vehicle body rear structure, wherein an inclined portion is provided between the lower front wall and the lower bulge portion. The vehicle body rear structure according to claim 4,
A vehicle body rear structure, wherein the inclined portion is provided with a through hole for harness routing. The vehicle body rear part structure according to any one of claims 1 to 5,
Above the wrap portion, a patch is provided that is joined to the outer side surface of the rear pillar inner upper compartment.
A vehicle body rear structure, wherein the rear pillar inner upper and the patch constitute a third closed cross-section.

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