JP2007106375A - Vehicle body skeleton structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body skeleton structure capable of ensuring productivity of a vehicle body skeleton member while enhancing joint strength of the vehicle body skeleton member and a member to be joined. <P>SOLUTION: In the skeleton structure 10 of a vehicle body floor part, a skeleton part 40 of a front side member 16 forms a closed cross section structure C2 with a floor panel 12 by joining flanges 36, 38 of the front side member 16, i.e., the vehicle body skeleton member to the floor panel 12. A rear end of the front side member 16 is made to a gradual variation part 42 in which width of the flanges 36, 38 in a direction perpendicular to its longitudinal direction is continuously enlarged toward a rear end and development length of the skeleton part 40 in a direction perpendicular to the longitudinal direction is continuously reduced toward the rear end. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle body skeleton structure that forms a vehicle body skeleton having a closed section structure by joining a vehicle body skeleton member and a member to be joined.

In order to improve the joint strength by spot welding of the members constituting the vehicle body, it is necessary to increase the number of spot welding points. In order to increase the number of spot welding points as described above, a technique is disclosed in which the shape of the joining flange of the spring support is changed to expand the joining area between the joining flange and the apron member (see, for example, Patent Document 1). .
JP 2000-355283 A JP-A-6-171551

  However, in the conventional techniques as described above, although improvement in bonding strength is expected, the productivity of the members has not been considered.

  In view of the above facts, an object of the present invention is to obtain a vehicle body frame structure capable of ensuring the productivity of the vehicle body frame member while improving the bonding strength between the vehicle body frame member and the member to be bonded. .

  In order to achieve the above object, the vehicle body skeleton structure according to the first aspect of the present invention forms a closed cross-sectional structure by joining the opening end side of the vehicle body skeleton member elongated in a predetermined direction to the member to be joined. A vehicle body skeleton structure, wherein the vehicle body skeleton member includes a skeleton portion that is formed in a cross-sectional shape that opens toward the bonded member side, and a flange that extends from an opening edge of the skeleton portion and is bonded to the bonded member. And a part of the longitudinal direction of the vehicle body skeleton member has a width of the flange in a direction perpendicular to the longitudinal direction that is continuously enlarged along the longitudinal direction. The developed length of the skeleton portion in the perpendicular direction is a gradually changing portion that is continuously reduced along the longitudinal direction.

  In the vehicle body skeleton structure according to claim 1, the vehicle body skeleton member has a so-called hat shape that opens to the member to be joined, and the skeleton portion is joined to the member to be joined by joining the flange to the member to be joined. And constitute a closed cross-sectional structure (body skeleton). In the gradually changing portion of the vehicle body skeleton member, the flange is widened in the direction orthogonal to the longitudinal direction, and the joining area with the member to be joined becomes large. For this reason, it becomes possible to increase the joint strength between the vehicle body skeleton member and the member to be joined.

  Here, in the gradually changing portion, the development length (cross-sectional length) along the direction orthogonal to the longitudinal direction in the skeleton portion is reduced, so in the vehicle body skeleton member, the flange width and the development length of the skeleton portion in the gradually changing portion. Is prevented or prevented from becoming larger than the portion other than the gradually changing portion. That is, in the vehicle body skeleton structure, for example, the width of the material before molding of the vehicle body skeleton member formed by pressing is suppressed or prevented from being larger than the other portions at the portion where the flange width is enlarged. . Thereby, the deterioration of the yield at the time of production of a vehicle body frame member is suppressed, and productivity is secured.

  Thus, in the vehicle body skeleton structure according to the first aspect, the productivity of the vehicle body skeleton member can be ensured while improving the bonding strength between the vehicle body skeleton member and the member to be joined. The member to be joined to the vehicle body skeleton member may be, for example, a flat panel material or a hat-shaped skeleton member (half body) that opens to the vehicle body skeleton member side.

  A vehicle body skeleton structure according to a second aspect of the present invention is the vehicle body skeleton structure according to the first aspect, wherein the vehicle body skeleton member is provided with the gradually changing portion at an end portion in a longitudinal direction, and the longitudinal direction end portion. The frame portion is closed and has an end flange extending to the outside in the longitudinal direction with respect to the frame portion, and the end flange is continuous with the wide side of the flange in the gradually changing portion.

  In the vehicle body skeleton structure according to claim 2, the flange is gradually widened toward the longitudinal end portion of the vehicle body skeleton member, and the development length of the skeleton portion is reduced to form a gradually changing portion. The flange in the part is continuous with the end flange that extends to the outside in the longitudinal direction of the skeleton part. The end flange that continues to the wide side of the gradually widened flange gradually widens more than the width without the gradually varying portion without deteriorating the productivity. Bond strength can be effectively improved at the direction end.

  A vehicle body skeleton structure according to a third aspect of the present invention is the vehicle body skeleton structure according to the second aspect, wherein the gradually changing portion is set while maintaining an opening width of the skeleton portion.

  In the vehicle body skeleton structure according to the third aspect, the gradually changing portion is formed by widening the flange while maintaining the opening width of the skeleton portion by gradually reducing the depth from the opening end of the skeleton portion. For this reason, compared with the structure which expanded the flange, for example, reducing the opening width in a gradual change part, the width | variety of the edge part flange which follows the wide side in the flange of this gradual change part can be set large.

  A vehicle body skeleton structure according to a fourth aspect of the present invention is the vehicle body skeleton structure according to any one of the first to third aspects, wherein the member to be joined is a floor panel, and the gradually changing portion of the vehicle body skeleton member Are joined to flanges of other frame members joined to the opposite side of the floor panel.

  In the vehicle body skeleton structure according to the fourth aspect, the flange joint strength between the flange and the other skeleton member at the gradually changing portion of the vehicle body skeleton member via the floor panel is improved.

  The vehicle body skeleton structure according to a fifth aspect of the present invention is the vehicle body skeleton structure according to the fourth aspect, wherein the vehicle body skeleton member is a front side member that is elongated in the vehicle longitudinal direction and joined to the lower surface of the floor panel. The other frame member is a cross member joined to the upper surface of the floor panel across the rear end of the front side member in plan view.

  In the vehicle body skeleton structure according to the fifth aspect, for example, a load is transmitted from the front side member to the cross member at the time of a frontal collision of the vehicle body. Since the front side member and the cross member are joined at the flange of the gradually changing portion, the joining strength is high and the load transmission is effectively performed. Note that a gradual change portion may be provided in the middle in the longitudinal direction of the cross member, and the flanges in the gradual change portions may be joined.

  As described above, the vehicle body skeleton structure according to the present invention has an excellent effect that the productivity of the vehicle body skeleton member can be ensured while improving the joint strength between the vehicle body skeleton member and the member to be joined.

  A skeleton structure 10 of a vehicle body floor portion to which a vehicle skeleton structure according to a first embodiment of the present invention is applied will be described with reference to FIGS. 1 to 3. In the figure, the arrow FR indicates the front direction of the vehicle body, the arrow UP indicates the upward direction of the vehicle body, and the arrow IN indicates the vehicle width inside direction. In addition, “x” shown as appropriate in the drawing indicates a joint point (spot) by spot welding, a single one indicates a spot at a two-member overlapping portion, and a portion surrounded by “◯” indicates a three-member overlapping portion. Each of the hit points is shown.

  FIG. 1A shows a plan view in which the skeleton structure 10 of the vehicle body floor portion is partially cut away, and FIG. 1B shows a line 1B-1B in FIG. A cross-sectional view is shown. As shown in these drawings, in the skeleton structure 10 of the vehicle body floor portion, a floor cross member 14 elongated in the vehicle width direction is bonded to the upper surface side of a floor panel 12 as a member to be bonded that constitutes the vehicle body floor. In addition, a front side member rear 16 that is elongated in the longitudinal direction of the vehicle body is joined to the lower surface side of the floor panel 12. Although illustration is omitted, the front side member rear 16 is connected to a bumper reinforcement which is a skeleton member of the front bumper via the front side member front.

  The floor cross member 14 as another skeleton member in the present invention is formed in a hat shape that opens downward in a cross-sectional view orthogonal to the longitudinal direction, as shown in FIG. Specifically, the floor cross member 14 extends from the upper wall 18, the front wall 20 and the rear wall 22 depending from the front and rear ends of the upper wall 18, and from the respective lower ends of the front wall 20 and the rear wall 22. The front flange 24 and the rear flange 25 are provided.

  The floor cross member 14 has a front flange 24 and a rear flange 25 joined to the upper surface of the floor panel 12 by spot welding. In this state, a substantially rectangular frame-shaped closed cross-sectional structure C1 surrounded by the floor panel 12, the upper wall 18, the front wall 20, and the rear wall 22 is formed on the upper side of the floor panel 12.

  The outer end of the floor cross member 14 in the vehicle width direction is provided with a terminal flange 26 projecting from the upper wall 18, the front wall 20, and the rear wall 22 to the outside of the closed cross section. Are joined by spot welding to a rocker inner 28A of a rocker 28 which is a vehicle body skeleton member disposed along the front-rear direction of the vehicle body. Although illustration is omitted, an end flange provided at the inner end in the vehicle width direction of the floor cross member 14 in the same manner as the end flange 26 is joined to the floor tunnel.

  As shown in FIG. 2, the front side member rear 16 is formed in a hat shape that opens upward in a cross-sectional view orthogonal to the longitudinal direction. Specifically, the front side member rear 16 includes a lower wall 30, an inner wall 32 and an outer wall 34 erected from the inner and outer ends of the lower wall 30 in the vehicle width direction, and upper ends of the inner wall 32 and the outer wall 34. An inner flange 36 and an outer flange 38 extending inward and outward in the vehicle width direction.

  The front side member rear 16 corresponds to a vehicle body skeleton member in the present invention. As shown in FIG. 1, an inner flange 36 and an outer flange 38 are joined to the lower surface of the floor panel 12 by spot welding. In this state, a substantially rectangular frame-shaped closed cross-sectional structure C <b> 2 surrounded by the floor panel 12, the lower wall 30, the inner wall 32, and the outer wall 34 is formed on the lower side of the floor panel 12. The lower wall 30, the inner side wall 32, and the outer side wall 34 having a U-shaped cross section that opens upward in the front side member rear 16 serve as a skeleton portion 40 that forms a closed sectional structure C 2 with the floor panel 12.

  The rear end portion of the front side member rear 16 is a gradually changing portion 42. As shown in FIGS. 2 and 3, in the gradual change portion 42, the height H of the inner wall 32 and the outer wall 34 of the skeleton portion 40 gradually decreases toward the rear end, and the inner flange 36 and the outer flange 38. The width W along the vehicle width direction is gradually widened.

  As shown in FIGS. 1B and 3A, in this embodiment, the inner flange 36 and the outer flange 38 of the gradual change portion 42 are the inner flanges in the general portion 41 located on the front side of the gradual change portion 42. 36 and the outer flange 38 are flush with each other, and the lower wall 30 is inclined so as to be higher on the rear side than on the front side. Further, as shown in FIG. 1A, the upper end opening width Wo2 of the skeleton 40 in the gradually changing portion 42 is substantially equal to the opening width Wo1 in the general portion of the front side member rear 16.

  Further, the front side member rear 16 is projected in a direction from the upper edge of the rear wall 44 and the rear wall 44 that closes the rear end of the skeleton 40 (gradually changing portion 42), and is respectively attached to the inner flange 36 and the outer flange 38. It has a rear end flange 46 as an end flange that is flush with the surface. As shown in FIG. 1A, the width Wr along the vehicle width direction of the rear end flange 46 is equal to or slightly larger than the width Wj in plan view at the rear end of the gradually changing portion 42.

  As shown in FIG. 3, the front side member rear 16 is provided with a gradual change portion 42, so that the developed length (cross-sectional length) L <b> 1 of the cross section orthogonal to the longitudinal direction of the general portion 41 shown in FIG. 3 (C), the development length L2 of the cross section perpendicular to the longitudinal direction of the gradually changing portion 42 and the width Wr of the rear end flange 46 in the direction perpendicular to the longitudinal direction substantially coincide (the dimensional difference is a predetermined difference). (Within the range).

  The development lengths L1 and L2 of the cross section perpendicular to the longitudinal direction of the front side member rear 16 are the sum of the width of the lower wall 30 and the height of the inner wall 32 and the outer wall 34, which are the development length of the skeleton 40, respectively. The total developed length, which is the sum of the widths of the inner flange 36 and the outer flange 38, is grasped.

  The front side member rear 16 described above is integrally formed by molding by press working (such as deep drawing).

  The front side member rear 16 is arranged so that the floor cross member 14 mainly crosses over the gradual change portion 42 in a plan view as shown in FIG. The front end 46A of the rear end flange 46 of the front side member rear 16 is joined to the floor panel 12 and the rear flange 25 of the floor cross member 14 in a superposed state by spot welding, and the rear portion 46B is joined to the floor panel. 12 are joined by spot welding in a state of being overlapped with two.

  Further, a part of the longitudinal direction of the inner flange 36 and the outer flange 38 in the gradual change portion 42 is joined to the front flange 24 of the floor panel 12 and the floor cross member 14 in a superposed state by spot welding. . The front and rear flanges 24 and 25 of the floor cross member 14, the general portion 41 of the front side member rear 16 and the flanges 36 and 38 in the vehicle width direction of the gradually changing portion 42 are respectively connected to the floor panel 12 in portions other than the above. Two sheets are joined by spot welding in a superposed state. The interval between spot welding points (spot pitch) for each spot welding is set to 30 mm to 35 mm or more in order to avoid diversion during energization.

  Next, the operation of the first embodiment will be described.

  When the vehicle to which the skeleton structure 10 of the vehicle body floor portion having the above configuration is applied reaches a frontal collision, a backward load is applied to the front side member 15 from the bumper reinforcement. This load is transmitted to the floor cross member 14 via the front side member rear 16.

  Here, in the skeleton structure 10 of the vehicle body floor portion, since the gradually changing portion 42 is provided at the rear end of the front side member rear 16, the inner flange 36 which is a joint portion to the floor panel 12 in the gradually changing portion 42 and The outer flange 38 can be set large, and the width of the rear end flange 46 can be increased. In this embodiment, the front portion 46A of the rear end flange 46 is joined to the rear flange 25 of the floor cross member 14 with the floor panel 12 interposed therebetween, so that the joining strength between the front side member rear 16 and the floor cross member 14 is increased. Is expensive.

  This will be described in comparison with a comparative example shown in FIGS. In addition, about the part corresponding to this embodiment in a comparative example, the same code | symbol as this embodiment is attached | subjected. The frame structure 90 of the vehicle body floor portion according to the comparative example shown in FIGS. 5A and 5B has an inner flange 36, an outer flange 38, and a rear flange 94 of the front side member rear 92 on the lower side of the floor panel 12. Are joined by spot welding. As shown in FIG. 6, the inner flange 36 and the outer flange 38 have substantially the same width as the inner flange 36 and the outer flange 38 in the general portion 41 of the front side member rear 16 over the entire length, and the rear flange 94 is also substantially equivalent. It is said that the width.

  In the skeleton structure 90 of the vehicle body floor portion according to this comparative example, the number of spot welding joint points cannot be increased because the rear flange 94 joined to the rear flange 25 of the floor cross member 14 is small. If the rear flange 94 is expanded in the width direction as shown by an imaginary line in FIG. 6 in order to increase the number of joint points, the width dimension of the material for production by press working becomes larger on the rear end side than the other portions. So the yield gets worse. On the other hand, if the number of joint points is increased without enlarging the rear flange 94, there arises a problem of diversion during spot welding energization.

  On the other hand, in the present embodiment, the front side member rear 16 is provided with a gradually changing portion 42 on the front side member rear 16 to widen the inner flange 36 and the outer flange 38 while reducing the development length of the skeleton 40. A configuration has been realized in which the developed length L1 of the portion 41, the developed length L2 of the gradually changing portion 42, and the width Wr of the rear end flange 46 are substantially constant.

  With this configuration, it was possible to widen the rear end flange 46 as compared with the comparative example while maintaining the required yield by keeping the width of the material for production by press working constant. In particular, since the deformed portion is set while maintaining the upper end opening width Wo2 of the skeleton 40 in the gradual change portion 42 to be equal to the opening width Wo1 of the general portion, in other words, the inner flange in the gradual change portion 42 36, since the outer flange 38 is not widened inside the opening of the skeleton 40, the width Wr of the rear end flange 46 connected to the inner flange 36 and the outer flange 38 can be further increased.

  The number of joints between the rear flange 25 of the rear end flange 46 that is wide as described above and the rear flange 25 of the floor panel 12 and the floor cross member 14 is set larger than the number of joints in the comparative example. The joining strength with the floor cross member 14 could be improved.

  Thereby, in the skeleton structure 10 of the vehicle body floor portion, the three-part overlapping of the front portion 46A of the rear end flange 46, the floor panel 12, and the rear flange 25 of the floor cross member 14 at the time of the applied frontal collision of the automobile. It is possible to prevent the hitting point from being peeled off at the joint portion and to effectively transmit from the front side member rear 16 to the floor cross member 14, so that the frontal collision performance is improved.

  As described above, in the skeleton structure 10 of the vehicle body floor portion according to the first embodiment, the productivity of the front side member rear 16 is improved while improving the bonding strength between the front side member rear 16 and the floor panel 12 and the floor cross member 14. Can be secured.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Note that parts and portions that are basically the same as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  FIG. 4A shows a plan view in which the skeleton structure 50 of the vehicle body floor portion according to the second embodiment is partially cut away, and FIG. 4B shows FIG. Sectional view along line 4B-4B is shown. As shown in these drawings, the skeleton structure 50 of the vehicle body floor portion is provided with a floor cross member 54 as a vehicle body skeleton member having a gradually changing portion 52 instead of the floor cross member 14. Different from structure 10.

  As shown in FIG. 4A, a pair of gradual change portions 52 of the floor cross member 54 are provided symmetrically with each other inside and outside in the vehicle width direction at a portion crossing the gradual change portion 42 of the front side member rear 16. A member joint portion 56 is formed between the portions 52. Note that a portion other than the gradual change portion 52 and the member joint portion 56 in the floor cross member 54 is referred to as a general portion 58.

  The member joining portion 56 has a development length of a skeleton portion 60 having a U-shaped cross-section that is opened downward and includes the upper wall 18, the front wall 20, and the rear wall 22. The width of the front flange 62 and the rear flange 64 provided in place of the front flange 24 and the rear flange 25 in the longitudinal direction of the vehicle body is larger than the width of the front flange 62 and the rear flange 64 in the general portion 58. ing. In this embodiment, the member joining portion 56 has a width along the front-rear direction of the upper wall 18 in which the heights of the front wall 20 and the rear wall 22 are substantially equal to the heights of the front wall 20 and the rear wall 22 in the general portion. Is smaller than the width of the upper wall 18 in the general portion.

  The pair of gradually changing portions 52 gradually reduce the cross-sectional length of the skeleton portion 60 from the general portion 58 toward the member joint portion 56 while maintaining the height of the front wall 20 and the rear wall 22. The front flange 62 and the rear flange 64 are formed so as to gradually increase the width in the longitudinal direction of the vehicle body. The development length of the cross section orthogonal to the longitudinal direction (vehicle width direction) of the general portion 58, the gradual change portion 52, and the member joint portion 56 is set to be substantially the same.

  In the floor cross member 54 described above, the rear flange 64 at the member joint portion 56 is located on the rear end flange 46 of the front side member rear 16. The rear flange 25 in the member joining portion 56 is joined by spot welding in a three-part overlapping state with the front panel 46A and the rear portion 46B of the rear end flange 46 of the floor panel 12 and the front side member rear 16. Further, the front flange 62 in the member joining portion 56 is joined by spot welding in a three-part overlapping state with the floor panel 12 and the inner flange 36 and the outer flange 38 in the gradually changing portion 42 of the front side member rear 16.

  Other configurations of the skeleton structure 50 of the vehicle body floor portion are the same as the corresponding configurations of the skeleton structure 10 of the vehicle body floor portion according to the first embodiment.

  Therefore, the skeleton structure 50 of the vehicle body floor portion according to the second embodiment can obtain the same effect by the same operation as that of the first embodiment. That is, the productivity of the floor cross member 14 can be ensured while improving the bonding strength between the floor cross member 54, the floor panel 12, and the front side member rear 16. On the contrary, it goes without saying that the productivity of the front side member rear 16 can be secured while improving the joining strength between the front side member rear 16 and the floor panel 12 and the floor cross member 54.

  In this embodiment, the gradually changing portions 42 and 52 are set on both the front side member rear 16 and the floor cross member 14 joined through the floor panel 12 (the rear end flange 46 and the member joined portion 56 are thereby set). Therefore, the number of spot welding joints in the rear flange 64 and the rear end flange 46 that directly join them can be greatly increased. For this reason, the joining strength between the front side member rear 16 and the floor cross member 54 is further improved. Further, since the developed lengths of the cross sections orthogonal to the longitudinal direction (vehicle width direction) of the general portion 58, the gradual change portion 52, and the member joint portion 56 are substantially the same, the productivity of the floor cross member 54 is also ensured.

  Thus, the gradual change part in this invention can also be set to the longitudinal direction intermediate part of a vehicle body frame member.

  In each of the above embodiments, the example in which the vehicle body skeleton structure of the present invention is applied to the skeleton structures 10 and 50 of the vehicle body floor portion is shown, but the present invention is not limited to this, and the joined portion of the vehicle body skeleton member It can be applied to various skeleton structures where it is desired to increase the bonding area with the agent. Therefore, the direct joining portion of the vehicle body skeleton members (front side member 16, floor cross member 54) is not limited to the panel member (floor panel 12), and the hat-shaped vehicle body skeleton member is replaced with a hat-shaped member. You may apply this invention to the structure to join.

  Moreover, in the said embodiment, the front-end flanges 62 and 64 in the member end part 56 set between the rear end flange 46 and / or the gradual change part 52 which continue to the gradual change part 42 are between the other side skeleton members. Although an example in which the floor panel 12 is sandwiched is shown, the present invention is not limited to this. For example, the inner and outer flanges 36 and 38 widened in the gradually changing portion 42 and the gradually changing portion 52 are widened. Further, the front and rear flanges 62 and 64 may be joined with the floor panel 12 interposed therebetween.

  Furthermore, in the said embodiment, although the cross-sectional shape of the frame parts 40 and 60 showed the substantially U shape, this invention is not limited to this, For example, the frame parts 40 and 60 are substantially V-shaped, The cross section may have a substantially semicircular arc shape.

  In the above embodiment, the rear end of the front side member 16 is closed by the rear wall 44. However, the present invention is not limited to this example. The height of the side walls 32, 34 may be 0, and the rear wall 46 may be extended from the lower wall 30.

It is a figure which shows the frame | skeleton structure of the vehicle body floor part which concerns on the 1st Embodiment of this invention, Comprising: (A) is a partially cutaway top view, (B) is the 1B-1B line | wire of FIG. 1 (A). FIG. It is a perspective view which shows the front side member rear which comprises the frame structure of the vehicle body floor part which concerns on the 1st Embodiment of this invention. It is a figure which shows the front side member rear which comprises the frame structure of the vehicle body floor part which concerns on the 1st Embodiment of this invention, (A) is sectional side view, (B) is 3B-3B of FIG. 3 (A). 3C is a cross-sectional view taken along line 3C-3C in FIG. 3A, and FIG. 3D is a cross-sectional view taken along line 3D-3D in FIG. It is a figure which shows the frame | skeleton structure of the vehicle body floor part which concerns on the 2nd Embodiment of this invention, Comprising: (A) is a partially cutaway top view, (B) is the 4B-4B line | wire of FIG. 4 (A). FIG. It is a figure which shows the comparative example with embodiment of this invention, Comprising: (A) is a partially cutaway top view, (B) is sectional drawing along the 5B-5B line | wire of FIG. 5 (A). It is a perspective view which shows the front side member rear in the comparative example with this invention embodiment.

Explanation of symbols

10 Frame structure of the vehicle body floor (vehicle frame structure)
12 Floor panel 14 Floor cross member (Other frame members)
16 Front side member rear (body skeleton members, other skeleton members)
36 Inner flange (flange)
38 Outer flange (flange)
40 Skeletal part 42 Gradual change part 46 Rear end flange (end flange)
50 Skeleton structure of the car body floor (car body skeleton structure)
52 Gradual change part 60 Frame part 62 Front flange (flange)
64 Rear flange (flange)

Claims (5)

A vehicle body skeleton structure that forms a closed cross-sectional structure by joining an opening end side of a vehicle body skeleton member elongated in a predetermined direction to a member to be joined,
The vehicle body skeleton member includes a skeleton portion formed in a cross-sectional shape that opens to the bonded member side, and a flange that extends from an opening edge of the skeleton portion and is bonded to the bonded member;
And a part of the longitudinal direction of the vehicle body skeleton member is such that the width of the flange in the direction perpendicular to the longitudinal direction is continuously enlarged along the longitudinal direction, and the direction in the perpendicular direction to the longitudinal direction is A vehicle body skeleton structure in which a development length of the skeleton portion is a gradually changing portion continuously reduced along the longitudinal direction.   The vehicle body skeleton member is provided with the gradually changing portion at an end portion in a longitudinal direction, and the end portion extending to the outside in the longitudinal direction with respect to the skeleton portion while the skeleton portion is closed at the longitudinal end portion. The vehicle body skeleton structure according to claim 1, further comprising a flange, wherein the end flange is continuous with the wide side of the flange in the gradually changing portion.   The vehicle body skeleton structure according to claim 2, wherein the gradually changing portion is set while maintaining an opening width of the skeleton portion.   The member to be joined is a floor panel, and a flange in the gradually changing portion of the vehicle body skeleton member or the end flange and a flange of another skeleton member disposed on the opposite side of the floor panel sandwich the floor panel. The vehicle body skeleton structure according to any one of claims 1 to 3, wherein the vehicle body skeleton structure is joined together.   The vehicle body skeleton member is a front side member that is elongated in the longitudinal direction of the vehicle body and is joined to the lower surface of the floor panel, and the other skeleton member has a rear end of the front side member in plan view on the upper surface of the floor panel. 5. The vehicle body skeleton structure according to claim 4, wherein the vehicle body skeleton structure is a cross member joined across.

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