JP5426612B2 - Auto body structure - Google Patents

Description

  In the present invention, a floor frame extending in the longitudinal direction of the vehicle body and a cross member extending in the vehicle width direction are crossed below the floor panel, and the floor frame and the cross member are overlapped in the H plane at the intersection. The present invention relates to a vehicle body structure that is connected by welding.

  A rear end of a front side frame having a U-shaped cross section with an open top surface is coupled to a front wall of a middle cross member having a U-shaped cross section with an open top surface below the floor panel, When connecting the rear ends of the floor frames having a U-shaped cross section with an open top surface, a middle cross member includes a flat bottom portion extending the bottom surface of the front side frame rearward and a flat bottom portion extending the bottom surface of the floor frame forward. Japanese Patent Application Laid-Open Publication No. 2004-228707 discloses a structure in which three sheets are overlapped and bonded to the bottom surface of the above.

  Also, below the floor panel, a rear end of a front side frame having a U-shaped cross section with an open top surface, a front end of a floor frame having a U-shaped cross section with an open top surface, and a frame stiffener having a U-shaped cross section with an open top surface. Patent Document 2 below discloses that the front side frame and the floor frame are joined together by overlapping the three and fastening the three overlapped parts with bolts and nuts.

JP 2010-280293 A JP-A-8-34368

  By the way, what is described in the above-mentioned patent document 1 is that when the bottom portion of the front side frame is extended, the bottom portion of the floor frame is extended and the bottom surface of the middle cross member is overlapped in three layers and spot welding is performed. If a floor panel has already been stretched above them, the floor panel becomes in the way and there is a problem that the electrode arm for spot welding cannot reach the welded portion. In order to avoid this, the spot welding may be completed before the floor panel is stretched. However, there is a problem that the production procedure of the vehicle body is reduced due to restrictions on the assembly procedure of the vehicle body.

  Further, as in the invention described in the above-mentioned Patent Document 2, if the coupled portion below the floor panel is coupled with a bolt and a nut, the coupling work can be performed without being disturbed by the floor panel. If nuts are used, there is a problem that the number of parts increases and the weight increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to perform an operation of spot welding by overlapping a floor frame and a cross member in an H plane without being obstructed by a floor panel.

In order to achieve the above object, according to the first aspect of the present invention, a floor frame extending in the longitudinal direction of the vehicle body and a cross member extending in the vehicle width direction are crossed below the floor panel, and at the crossing portion. A vehicle body structure for an automobile in which the floor frame and the cross member are overlapped in an H plane and joined by spot welding, and the floor panel bulges upward so as to cover an in-vehicle component disposed below the floor panel The floor bulging portion includes a bulging portion, and the width of the floor bulging portion gradually decreases in the rearward direction and continues to the flat portion of the floor panel. the said flat portion of the outer electrode arms Oite spot welding device above the intersection is Ru been proposed vehicle body structure that can pass opening is formed.

According to the invention described in claim 2 , in addition to the configuration of claim 1 , the lid member that closes the opening includes a main body portion that fits into the opening, and an outer periphery of the main body portion that is continuous with the opening. There is proposed a vehicle body structure characterized by comprising a flange portion coupled to the upper surface of the edge portion via a seal member.

According to the third aspect of the present invention, the rear end of the floor frame extending in the longitudinal direction of the vehicle body and the front end of the rear side frame extending in the longitudinal direction of the vehicle body are connected to each other at the connection portion below the floor panel. A vehicle body structure for an automobile in which a floor frame, a rear side frame, and a cross member extending in the vehicle width direction are intersected, and an opening located above the intersecting portion is formed in the floor panel, and is an upper front end of the rear side frame A first welding flange bent in the vehicle width direction from the notch formed in the upper surface is overlapped with the rear side surface (17b) of the cross member in the T plane to perform first spot welding , and the upper rear end of the floor frame since notch formed in the second scan by the second welding flange by bending in the vehicle width direction superimposed in T plane front side of the cross member The Tsu bets welding, superimposed in the H-plane a third welding flange by bending the respective vehicle width direction from the notch of the notch and the floor frame of the rear side frame in the same location of the bottom surface of the cross member Te third and spot welding, said opening, said third that Ru is proposed vehicle body structure characterized by electrode arms of spot welding apparatus during spot welding can pass through.

According to the invention described in claim 4 , in addition to the configuration of any one of claims 1 to 3 , the vehicle further includes a side sill that extends in the vehicle body front-rear direction on the outer side in the vehicle width direction of the floor frame, A vehicle body structure is proposed in which an outer side surface of the floor frame in the vehicle width direction is coupled to a side sill bulging portion in which a side sill is bulged inward in the vehicle width direction.

According to the invention described in claim 5 , in addition to the configuration of any one of claims 1 to 4 , the bottom surface of the floor frame and the bottom surface of the rear side frame are separated from the bottom surface of the cross member. A vehicle body structure is proposed which is connected to each other at a position protruding downward.

  The middle cross member 17 of the embodiment corresponds to the cross member of the present invention, and the fuel tank 19 of the embodiment corresponds to the on-vehicle component of the present invention.

According to the present invention , the floor frame extending in the vehicle longitudinal direction and the cross member extending in the vehicle width direction are crossed below the floor panel, and the floor frame and the cross member are overlapped in the H plane at the intersection to perform spot welding. Connect by. Since the floor panel has an opening through which the electrode arm of the spot welding device can pass above the intersection, spot welding can be performed even after the floor panel is stretched above the intersection, and the assembly procedure of the car body is free. The number of parts and the weight can be reduced as compared to the case of using bolts and nuts to increase the production efficiency by increasing the degree and the bolts and nuts.

In particular , according to the first aspect of the present invention , even if the floor panel includes a floor bulging portion that bulges upward so as to cover the in-vehicle component disposed below the floor panel, the floor bulging portion is a vehicle facing backward. Since the width in the width direction gradually decreases and continues to the flat part of the floor panel, and the opening is formed in the flat part on the outer side in the vehicle width direction at the rear part of the floor bulge part, the upper electrode arm for spot welding is When the electrode arm is inserted into the opening, the electrode arm can be prevented from interfering with the floor bulge portion of the floor panel, and the workability of spot welding can be improved.

In particular , according to the invention of claim 2, the lid member that closes the opening includes a main body portion that fits into the opening, and a flange portion that is connected to the upper surface of the edge portion of the opening through the seal member, connected to the outer periphery of the main body portion. In addition to facilitating the positioning of the lid member with respect to the opening by the main body, it is possible to prevent water from entering the passenger compartment by a sealing member sandwiched between the flange portion and the upper surface of the edge of the opening. Can do.

In particular , according to the invention of claim 3, spot welding is performed by superposing the first welding flange bent in the vehicle width direction from the notch formed in the upper front end of the rear side frame on the rear surface of the cross member in the T plane. The second welding flange bent in the vehicle width direction from the notch formed in the upper rear end of the floor frame is overlapped with the front side surface of the cross member in the T plane and spot welded, and the rear side frame notch and the floor frame Since the third welding flange bent in the vehicle width direction from each notch is overlapped in the H plane at the same location on the bottom surface of the cross member and spot welded, the front impact load is efficiently transferred from the floor frame to the cross member. In addition to the transmission, the rear impact load can be efficiently transmitted from the rear side frame to the cross member.

In particular , according to the invention of claim 4, the outer surface of the floor frame in the vehicle width direction is formed on the side sill bulging portion in which the side sill extending in the vehicle longitudinal direction on the outer side in the vehicle width direction of the floor frame is bulged inward in the vehicle width direction. Therefore, the front panel load can be transmitted directly from the floor frame to the side sill to minimize the deformation of the floor panel.

In particular , according to the invention of claim 5, since the bottom surface of the floor frame and the bottom surface of the rear side frame are coupled to each other at a position protruding downward from the bottom surface of the cross member, the front impact load is directly applied from the floor frame to the rear side frame. Can be transmitted to minimize floor panel deformation.

The perspective view which shows the frame structure of the vehicle body center part of a motor vehicle. FIG. 2 is a two-direction arrow view of FIG. 1. FIG. 3 is a three-direction arrow view of FIG. 2. FIG. 4 is an enlarged view of part 4 of FIG. 3. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a view in the direction of arrows 6 in FIG. 5. The perspective view of the intersection of a floor frame, a rear side frame, and a middle cross member.

  Embodiments of the present invention will be described below with reference to FIGS.

  FIG. 1 shows a vehicle body frame structure of an automobile. First, definitions of the front-rear direction, left-right direction (vehicle width direction), up-down direction, T-plane, B-plane, and H-plane in this specification will be described. The front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined on the basis of an occupant seated in the driver seat. Further, the T plane is a plane orthogonal to the longitudinal axis, and for example, the front surface of the vehicle body or the rear surface of the vehicle body corresponds to this. The B surface is a surface orthogonal to the left-right direction axis, and corresponds to the left side surface or the right side surface of the vehicle, for example. The H plane is a plane orthogonal to the vertical axis, and corresponds to, for example, a vehicle body ceiling surface or a vehicle body floor surface. However, the T plane includes a plane inclined at an angle of less than 45 ° with respect to the plane orthogonal to the front-rear axis, and the B plane includes an angle of less than 45 ° with respect to the plane orthogonal to the left-right axis. And the H plane includes a plane inclined at an angle of less than 45 ° with respect to the plane orthogonal to the vertical axis.

  As shown in FIG. 1, the front ends of a pair of left and right floor frames 12, 12 extending in the longitudinal direction of the vehicle body are connected in series to the rear ends of the pair of left and right front side frames 11, 11 extending in the longitudinal direction of the vehicle body. The front ends of a pair of left and right rear side frames 13 and 13 are connected in series to the rear ends of 12 and 12. The front ends of a pair of left and right side sills 14, 14 disposed in the vehicle front-rear direction outside the floor frames 12, 12 and the rear side frames 13, 13 via the outriggers 15, 15 extending in the vehicle width direction. , 12 are connected to the front ends. The front ends of the left and right floor frames 12, 12 are connected by a front cross member 16 extending in the vehicle width direction, and the middle portions of the left and right floor frames 12, 12 are connected by a middle cross member 17 extending in the vehicle width direction. The Both ends in the vehicle width direction of the front cross member 16 and the middle cross member 17 extend outward in the vehicle width direction beyond the left and right floor frames 12, 12 and are connected to the inner surfaces in the vehicle width direction of the left and right side sills 14, 14. Side sill bulging portions 14 a, 14 a where the center pillars 18, 18 are erected from the left and right side sills 14, 14 bulge inward in the vehicle width direction, and these side sill bulging portions 14 a, 14 a The front frames are coupled to the outer surfaces of the floor frames 12, 12 in the vehicle width direction.

  A fuel tank 19 is disposed in a space surrounded by the front cross member 16, the middle cross member 17, and the left and right floor frames 12, 12, and the outer periphery of the floor panel 20 covering the upper surface of the fuel tank 19 is the front cross member. 16, the middle cross member 17 and the left and right side sills 14 and 14 are connected. A floor bulging portion 20 a that bulges upward to avoid interference with the upper surface of the fuel tank 19 is formed at the front portion of the floor panel 20. The floor bulging portion 20a has a trapezoidal shape whose width in the vehicle width direction is wide on the front side and narrow on the rear side, and portions other than the floor bulging portion 20a of the floor panel 20 form a generally flat portion 20b. The left and right front seats 21 and 21 are disposed on the upper portion of the floor bulging portion 20a.

  The flat portion 20b on the outer side in the vehicle width direction of the rear portion of the floor bulging portion 20a of the floor panel 20 is located on the left and right so as to be located above the joint portion of the middle cross member 17, the floor frames 12, 12 and the rear side frames 13, 13. A pair of rectangular openings 20c, 20c are formed, and these openings 20c, 20c are closed by lid members 22, 22.

  As shown in FIGS. 3 to 5, the lid member 22 includes a main body portion 22 a that fits into the opening 20 c of the floor panel 20 from above, a reinforcing rib 22 b that is formed in a cross shape on the main body portion 22 a, and the main body portion 22 a. And a flange portion 22c projecting upward from the outer periphery and radially outward. The lower surface of the flange portion 22c is bonded to the upper surface of the edge portion of the opening 20c via a seal member 23 (see FIG. 5).

  A lid member 22 that closes the opening 20c of the floor panel 20 is fitted to the body portion 22a that fits into the opening 20c, and a flange portion that is connected to the upper surface of the edge portion of the opening 20c via the seal member 23, continuing to the outer periphery of the body portion 22a. 22c, the main body 22a facilitates the positioning of the lid member 22 with respect to the opening 20c, and the seal member 23 can prevent water from entering the passenger compartment.

  As shown in FIGS. 5 to 7, the middle cross member 17 is a U-shaped member having a front side surface 17a, a rear side surface 17b, and a bottom surface 17c and having an open top surface. First and second welding flanges 17d and 17e, which are bent in the longitudinal direction of the vehicle body, are provided at the upper end. The first and second welding flanges 17d and 17e are spot-welded W1 to the lower surface of the floor panel 20 at the H surface.

Further, at the end of the middle cross member 17, a third welding flange 17f obtained by bending the front side surface 17a, a fourth welding flange 17g obtained by bending the rear side surface 17b, and a fifth welding flange 17h obtained by extending the bottom surface 17c are provided. The third welding flange 17f is spot welded W2 on the side surface 14b of the side sill bulging portion 14a on the B surface, and the fourth welding flange 17g is spot welded on the side surface 14b of the side sill bulging portion 14a on the B surface. The fifth welding flange 17h is spot-welded W4 at the H surface to the bottom surface 14c of the side sill bulging portion 14a.
As shown in FIG. 5 to FIG. 7, the floor frame 12 includes a lower member 24 having a U-shaped section whose upper surface is open and an upper member 25 having a U-shaped section whose upper surface is lower than the lower member 24. Thus, spot welding W5 is performed in a state in which the upper member 25 is fitted to the upper portion of the lower member 24, and a rectangular closed cross section is formed.

  The U-shaped lower member 24 having an open upper surface has an inner surface 24a, an outer surface 24b, and a bottom surface 24c, and a notch 24d (see FIG. 7) is formed at the rear upper end so as to mesh with the middle cross member 17. The A first welding flange 24e obtained by bending the inner side surface 24a, and a second welding flange 24f and a third welding flange 24g obtained by bending the inner side surface 24a and the outer side surface 24b, respectively, are formed at positions facing the notches 24d.

  As shown in FIGS. 5 to 7, the rear side frame 13 includes a lower member 26 having a U-shaped section whose upper surface is open and an upper member 27 having a U-shaped section whose upper surface is lower than the lower member 26. Thus, spot welding W6 is performed in a state in which the upper member 27 is fitted to the upper portion of the lower member 26, and a rectangular closed cross section is formed.

  The U-shaped lower member 26 having an open upper surface includes an inner surface 26a, an outer surface 26b, and a bottom surface 26c, and a notch 26d (see FIG. 7) is formed at the front end of the lower member 26 so as to mesh with the middle cross member 17. The At positions facing the notch 26d, a first welding flange 26e and a second welding flange 26f obtained by bending the inner side surface 26a and the outer side surface 26b, respectively, a third welding flange 26g obtained by bending the inner side surface 26a and the outer side surface 26b, respectively. A fourth welding flange 26h is formed. A fifth welding flange 26i and a sixth welding flange 26j are formed by bending the inner side surface 26a and the outer side surface 26b, respectively, at positions adjacent to the notch 26d.

  The rear end of the floor frame 12 and the front end of the rear side frame 13 are coupled so that the notches 24d and 26d mesh with the middle cross member 17, and the bottom surface 24c of the floor frame 12 and the rear side frame 13 facing the notches 24d and 26d. The bottom surfaces 26c of each other are overlapped with each other.

  In this state, the first welding flange 24e of the floor frame 12 is spot-welded W7 on the T surface to the front side surface 17a of the middle cross member 17. The second welding flange 24f and the third welding flange 24g of the floor frame 12 are spotted on the bottom surface 17c of the middle cross member 17 on the H surface in a state of being superimposed on the third and fourth welding flanges 26g and 26h of the rear side frame 13. Welding W8.

  The first welding flange 26e and the second welding flange 26f of the rear side frame 13 are spot-welded W9 at the T surface to the rear side surface 17b of the middle cross member 17, and the fifth welding flange 26i and the sixth welding of the rear side frame 13 are also performed. The flange 26j is spot-welded W10 to the lower surface of the floor panel 20.

  Further, the upper part of the inner side surface 24a of the floor frame 12 is spot-welded W11 (see FIGS. 6 and 7) on the side B to the side surface 14b of the side sill bulging portion 14a.

  By the way, when the floor frame 12 and the rear side frame 13 are joined to the middle cross member 17, spot welding of the T surface is performed first, and spot welding of the H surface is performed later. The reason for this is that the T-surface spot welding work tact of the middle cross member 17, the floor frame 12 and the rear side frame 13 is followed by the H surface spot welding and floor panel of the middle cross member 17, the floor frame 12 and the rear side frame 13. This is to make the work tact of spot welding on the H surface extending 20 the same and minimize the dead time.

  That is, the first welding flange 24e of the floor frame 12 is spot-welded W7 to the front side surface 17a of the middle cross member 17 in the T plane, and the third and fourth welding flanges 26e and 26f of the rear side frame 13 are By performing spot welding W9 in the T plane on the rear side surface 17b, the notch 24d of the floor frame 12 and the notch 26d of the rear side frame 13 are joined to the front and rear of the middle cross member 17. At this time, the third and fourth welding flanges 26g and 26h of the rear side frame 13 overlap the lower side of the bottom surface 17c of the middle cross member 17, and the second and third welding flanges 24f and 24g of the floor frame 12 are below the lower side. Although three sheets overlap each other, spot welding W8 (four places) in that portion is postponed.

  In the next step, the floor panel 20 is placed on the top surfaces of the floor frame 12, the rear side frame 13, and the middle cross member 17, and spot welding W1 is performed on the first and second welding flanges 17d and 17e of the middle cross member 17, Spot welding W10 is applied to the fifth and sixth welding flanges 26i and 26j of the rear side frame 13, and the third and fourth welding flanges 26g and 26h of the rear side frame 13 and the second of the floor frame 12 are applied to the bottom surface 17c of the middle cross member 17. The third welding flanges 24f and 24g are spot-welded W8 by overlapping three sheets.

  When performing the spot welding W8, the upper electrode arm 28 of the upper and lower electrode arms 28 and 29 (see FIG. 5) of the spot welding apparatus may interfere with the floor panel 20 and not reach the welded portion. According to the present embodiment, since the opening 20c is formed in the floor panel 20 above the welded portion to be spot welded W8, the upper electrode arm 28 is inserted below the floor panel 20 through the opening 20c. Thus, spot welding W8 can be performed without hindrance. Since the opening 20c is closed by the lid member 22 after the spot welding W8 is completed, water or the like is prevented from entering the vehicle interior through the opening 20c.

  As described above, according to the present embodiment, even after the floor panel 20 is stretched above the intersection where the floor frame 12 and the rear side frame 13 intersect the middle cross member 17, the floor frame 12 and the rear side frame 13 are moved to the middle. Spot welding W8 can be performed on the cross member 17 in the H plane, increasing the degree of freedom of the assembly procedure of the vehicle body to increase production efficiency, and the number of parts and weight compared to the case of using bolts and nuts for connection. Can be reduced.

  Further, even if the floor panel 20 includes the floor bulging portion 20a that bulges upward to cover the upper side of the fuel tank 19, the floor bulging portion 20a gradually decreases in the vehicle width direction toward the rear, and the floor Since the opening 20c is formed in the flat portion 20b on the outer side in the vehicle width direction of the rear portion of the floor bulging portion 20a, when the upper electrode arm 28 is inserted into the opening 20c, the flat portion 20b of the panel 20 is connected. It is possible to improve the workability of the spot welding W8 by preventing the electrode arm 28 from interfering with the floor bulging portion 20a of the floor panel 20.

  Further, a first welding flange 24e bent in the vehicle width direction from a notch 24d (see FIG. 7) formed in the floor frame 12 is overlapped with the front side surface 17a of the middle cross member 17 in the T plane, and spot welding W7 is performed, and the rear side. The first and second welding flanges 26e and 26f bent in the vehicle width direction from the notches 26d (see FIG. 7) formed in the frame 13 are overlapped with the rear side surface 17b of the middle cross member 17 in the T plane and spot welded W9. The third welding flange 24g bent in the vehicle width direction from the notch 24d of the floor frame 12 and the third and fourth welding flanges 26g and 26h bent in the vehicle width direction from the notch 26d of the rear side frame 13 Since spot welding W8 was performed by overlapping the bottom surface 17c of the middle cross member 17 in the H plane, While efficiently transferred from the arm 12 to the middle cross member 17, the rear impact load it is possible to efficiently transferred from the rear side frame 13 to the middle cross member 17.

  At this time, the floor frame 12 and the rear side frame 13 have U portions having a depth h at the portions of the notches 24d and 26d, that is, the portions where the floor frame 12 and the rear side frame 13 are coupled to the lower surface of the middle cross member 17. Since it has a letter-shaped cross section (see FIG. 5), the front impact load can be transmitted directly from the floor frame 12 to the rear side frame 13 to minimize the deformation of the floor panel 20.

  Furthermore, since the outer surface 24b of the floor frame 12 is spot welded W11 (see FIGS. 6 and 7) in the B surface to the side surface 14b of the side sill bulging portion 14a of the side sill 14, the front impact load is applied from the floor frame 12. It can be transmitted directly to the side sill 14 to minimize the deformation of the floor panel 20.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the fuel tank 19 as an in-vehicle component is disposed below the floor bulging portion 20a of the floor panel 20, but the in-vehicle component is not limited to the fuel tank 19.

12 Floor frame 13 Rear side frame 14 Side sill 14a Side sill bulging portion 17 Middle cross member (cross member)
17a Front side surface 17b Rear side surface 17c Bottom surface 19 Fuel tank (vehicle-mounted parts)
20 Floor panel 20a Floor bulging portion 20b Flat portion 20c Opening 22 Lid member 22a Body portion 22c Flange portion 23 Seal member 24b Outer side surface 24c Bottom surface 24d Notch 24e First welding flange ( second welding flange)
24f 2nd welding flange ( 3rd welding flange)
24g 3rd welding flange ( 3rd welding flange)
26c Bottom face 26d Notch 26e First welding flange ( first welding flange)
26f 2nd welding flange ( 1st welding flange)
26g 3rd welding flange ( 3rd welding flange)
26h Fourth weld flange ( third weld flange)
28 Electrode arm W7 Spot welding (second spot welding)
W8 Spot welding (third spot welding)
W9 Spot welding (first spot welding)

Claims (5)

A floor frame (12) extending in the vehicle longitudinal direction and a cross member (17) extending in the vehicle width direction are crossed below the floor panel (20), and the floor frame (12) and the cross member ( 17) A body structure of an automobile that is overlapped in the H plane and joined by spot welding (W8),
The floor panel (20) includes a floor bulging portion (20a) that bulges upward so as to cover the vehicle-mounted component (19) disposed below the floor panel (20), and the floor bulging portion (20a) The width in the vehicle width direction gradually decreases toward the flat portion (20b) of the floor panel (20),
The floor bulging portion the flat rear part of the vehicle width direction outer side of (20a) (20b), the electrode arms of Oite spot welding device above the intersection (28) can pass the opening (20c) body structure of an automobile, characterized in that but is formed. The lid member (22) that closes the opening (20c) includes a main body (22a) that fits into the opening (20c), and an upper surface of an edge of the opening (20c) that is connected to the outer periphery of the main body (22a). the sealing member (23) flange portion which is bonded via the characterized in that it comprises the (22c), a vehicle body structure for an automobile according to claim 1 to. Below the floor panel (20), the rear end of the floor frame (12) extending in the vehicle longitudinal direction and the front end of the rear side frame (13) extending in the vehicle longitudinal direction are connected, and the floor frame (12 ) And the rear side frame (13) and a cross member (17) extending in the vehicle width direction, and an opening (20c) positioned above the intersection is formed in the floor panel (20). Structure,
First welding flanges (26e, 26f) bent in a vehicle width direction from a notch (26d) formed in the upper front end of the rear side frame (13) are formed on the rear surface (17b) of the cross member (17) as a T surface. superposition to the first spot welding (W9) and the inner notches formed in the upper portion of the rear end of the floor frame (12) a second welding flange bent from (24d) in the vehicle width direction (24e) said second spot welding superimposed in the T plane front side (17a) of the cross member (17) to the (W7), the said cutout (26 d) and the floor frame (12 of the rear side frames (13) ) bent from said notch (24d) of the respective vehicle width direction third welding flange (24f, 24g, 26g, bottom surface of the cross member to 26h) (17) (17c The third spot weld superimposed in the H plane (W8) to the same place of
It said opening (20c) is characterized in that the third spot electrode arm of the spot welding apparatus during welding (W8) (28) can pass through, the body structure of an automotive vehicle. The floor frame (12) includes a side sill (14) that extends in the vehicle front-rear direction on the vehicle width direction outer side, and the side sill bulge portion (14a) that bulges the side sill (14) toward the vehicle width direction inside has the floor The vehicle body structure according to any one of claims 1 to 3 , wherein the outer surface (24b) of the frame (12) in the vehicle width direction is coupled. The bottom surface (24c) of the floor frame (12) and the bottom surface (26c) of the rear side frame (13) are coupled to each other at a position protruding downward from the bottom surface (17c) of the cross member (17). The vehicle body structure according to any one of claims 1 to 4 , wherein the vehicle body structure is characterized.

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