JP6215978B2 - Automobile body structure and automobile manufacturing method - Google Patents

Description

  The present invention includes a front side frame extending forward from the floor, a steel plate upper member extending substantially horizontally forward from the front pillar, a steel plate lower member extending forward and downward from a front end of the upper member, and a front end of the lower member. And a connecting member that connects between the front ends of the front side frame, a square frame-shaped front bulkhead that connects the left and right front side frames, and an end in the vehicle width direction of the upper side of the front bulkhead of the lower member The present invention relates to a vehicle body structure including a front bulkhead upper side connected to an intermediate portion in the front-rear direction, and a method for manufacturing the vehicle.

  Two front and rear bulkheads (gussets 7 and 8) are fixed inside a hood ridge 20 having a closed cross-section to which the upper end of a damper base (strut housing 3) that supports the upper end of the damper of the front suspension is connected. The center of the front and rear of the bulkhead is positioned in front of the air box 2 connecting the left and right front pillars 1 and behind the damper base, and the rear bulkhead of the two front and rear bulkheads is What is positioned adjacent to the front wall of the air box 2 to absorb the collision energy by deforming the hood ridge 20 between the two front and rear bulkheads when the collision load of the frontal collision is input, It is known from Patent Document 1 below.

  Patent Document 2 listed below discloses that a damper base (strut housing 20) for supporting an upper end of a damper of a front suspension is made of an aluminum alloy.

Japanese Patent No. 4329791 Japanese Patent No. 5119827

  By the way, the damper base described in Patent Document 1 is made of a relatively high rigidity aluminum alloy like the damper base described in Patent Document 2, and the damper base is a relatively low rigidity upper member made of a steel plate. When a load inward in the vehicle width direction is input from the damper to the damper base, the arrangement of the bulkhead described in Patent Document 1 lacks rigidity of the upper member that supports the damper base. There is a possibility that the upper member is deformed and the load cannot be efficiently transmitted from the damper base to the vehicle body to be supported.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to increase the support rigidity of an aluminum alloy damper base with respect to a steel plate vehicle body.

  In order to achieve the above object, according to the first aspect of the present invention, a front side frame extending forward from the floor, a steel plate upper member extending substantially horizontally forward from the front pillar, and the upper member A lower member made of a steel plate extending from the front end to the front lower side, a connecting member connecting between the front end of the lower member and the front end of the front side frame, a square frame-shaped front bulkhead connecting the left and right front side frames, A vehicle body structure of an automobile comprising a front bulkhead upper side connecting an end portion in the vehicle width direction on the upper side of the front bulkhead to a middle portion in the front-rear direction of the lower member, and the outer wall in the vehicle width direction of the front side frame, Damper base made of aluminum alloy with the inner wall of the upper member in the vehicle width direction A bulkhead in the lower member is disposed inside a portion where the front bulkhead upper side is connected to the lower member, and a bulk in the upper member is located in a portion where the rear end of the damper base is connected to the upper member. A vehicle body structure is proposed in which a head is arranged.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the bulkhead in the lower member includes a quadrangular partition wall that partitions the interior of the lower member having a quadrangular cross section, and a mutual connection between the partition walls. Two first flange portions bent from two sides adjacent to each other and two second flange portions bent from other two sides adjacent to each other of the partition wall portion, the first flange portion being A vehicle body structure is proposed in which the second flange portion is connected to the inner surface of the lower member, and the second flange portion is connected to the outer surface of the lower member while passing through an opening formed in the lower member from the inside to the outside. .

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 2, the L-shaped connecting bracket in side view on the ridge line between the upper wall of the lower member and the outer wall in the vehicle width direction And the front bulkhead upper side is connected to the connecting bracket.

  According to the invention described in claim 4, in addition to the configuration of any one of claims 1 to 3, a reinforcing member that connects the front side frame and the lower member in the vertical direction is provided, A vehicle body structure is proposed in which the upper end of the reinforcing member faces the bulkhead in the lower member.

  According to the invention described in claim 5, in addition to the structure of any one of claims 1 to 4, the bulkhead in the upper member is a square that partitions the inside of the upper member having a rectangular cross section. A partition wall having a shape and four flange portions bent from four sides of the partition wall, the three flange portions being connected to the inner surface of the upper member, and the remaining one flange portion being the upper member and A vehicle body structure is proposed which is mechanically fastened to the damper base in a three-ply manner.

  According to the sixth aspect of the present invention, in addition to the structure of any one of the first to fifth aspects, the upper member is a rectangular cross-sectional member located at the outer end in the vehicle width direction of the front cowl. A vehicle body structure is proposed, which is connected to the front pillar via a pin.

  According to a seventh aspect of the present invention, in the automobile manufacturing method according to any one of the first to sixth aspects, the outer wall of the damper base in the vehicle width direction is connected to the vehicle of the upper member. A method of manufacturing an automobile, comprising: fastening with a rivet to an inner wall in the width direction; fastening a steel plate with a rivet to an inner wall in the vehicle width direction of the damper base; and welding the steel plate to an outer wall in the vehicle width direction of the front side frame. Proposed.

  According to the eighth aspect of the invention, in addition to the configuration of the seventh aspect, welding the gusset having an L-shaped cross section to the inner surface in the vehicle width direction of the steel plate and the upper wall of the front side frame. A featured automobile manufacturing method is proposed.

  According to the ninth aspect of the present invention, in addition to the configuration of the seventh or eighth aspect, the damper base, the upper member, the lower member, and a part of the wheel house are assembled as a subassembly, and the sub A method of manufacturing an automobile is proposed, wherein an assembly is welded to the front pillar and the front side frame.

  The front pillar lower 13 of the embodiment corresponds to the front pillar of the present invention, and the part 34F of the wheel house of the embodiment corresponds to the reinforcing member of the present invention.

  According to the configuration of claim 1, the vehicle body includes a front side frame extending forward from the floor, a steel plate upper member extending substantially horizontally forward from the front pillar, and a steel plate extending forward and downward from the front end of the upper member. Lower member, connecting member connecting the front end of the lower member and the front end of the front side frame, a square frame-shaped front bulkhead connecting the left and right front side frames, and the vehicle width direction end of the upper side of the front bulkhead And a front bulkhead upper side for connecting the portion to the front-rear direction intermediate portion of the lower member.

  The outer wall in the vehicle width direction of the front side frame and the inner wall in the vehicle width direction of the upper member are connected by a damper base made of aluminum alloy, and the bulk head in the lower member is arranged inside the portion where the front bulkhead upper side is connected to the lower member. The bulkhead in the upper member is disposed inside the rear end of the damper base connected to the upper member. Therefore, even if the rigidity of the damper base made of aluminum alloy is higher than the rigidity of the upper member and lower member made of steel plate, By increasing the rigidity of the upper member and lower member with the bulkhead in the upper member and the bulkhead in the lower member, the load input from the damper to the damper base is efficiently transmitted to and supported by the upper member, the lower member, and the front bulkhead upper side. Rukoto can.

  According to the configuration of claim 2, the bulkhead in the lower member includes a quadrangular partition that partitions the interior of the lower member having a quadrangular cross section, and two first flange portions that are bent from two adjacent sides of the partition. And two second flange portions bent from other two sides adjacent to each other of the partition wall portion, the first flange portion being connected to the inner surface of the lower member, and the second flange portion being an opening formed in the lower member Is connected to the outer surface of the lower member in a state where it passes from the inside to the outside, so that not only can the four sides of the bulkhead of the bulkhead in the lower member be connected to the four inner surfaces of the lower member to increase the rigidity, but also a closed cross-section The bulkhead in the lower member can be easily fixed inside the lower member.

  According to the third aspect of the present invention, the L-shaped connecting bracket is provided in the side view on the ridge line between the upper wall of the lower member and the outer wall in the vehicle width direction, and the front bulkhead upper side is connected to the connecting bracket. Enhance the rigidity of the connection between the lower member and the front bulkhead upper side, and efficiently transmit the load input to the damper base from the lower member to the front bulkhead via the connecting bracket and the front bulkhead upper side for support. Can do.

  According to the fourth aspect of the present invention, the reinforcing member for connecting the front side frame and the lower member in the vertical direction is provided, and the upper end of the reinforcing member faces the bulkhead in the lower member. Therefore, the connection between the lower member and the front bulkhead upper side is provided. The rigidity of the part can be further increased.

  According to the fifth aspect of the present invention, the bulkhead in the upper member includes a quadrangular partition that partitions the inside of the upper member having a quadrangular section, and four flanges that are bent from four sides of the partition. One flange part is connected to the inner surface of the upper member, and the remaining one flange part is mechanically fastened to the upper member and the damper base in three layers, so that the load input to the damper base is triple stacked. It is possible to efficiently transmit and support the upper member via the mechanical fastening portion.

  According to the configuration of the sixth aspect, since the upper member is connected to the front pillar via the rectangular cross-sectional member located at the outer end in the vehicle width direction of the front cowl, the load input to the damper base is rectangular from the upper member. It is possible to efficiently transmit and support the front pillar via the cross-sectional member.

  According to the seventh aspect of the present invention, the outer wall in the vehicle width direction of the damper base is fastened to the inner wall in the vehicle width direction of the upper member with rivets, and the steel plate is fastened to the inner wall in the vehicle width direction of the damper base with rivets. Since welding is performed on the outer wall in the vehicle width direction of the frame, a damper base made of aluminum alloy, which is difficult to weld, can be easily coupled to the upper member and the front side frame.

  According to the configuration of claim 8, since the gusset having the L-shaped cross section is welded to the inner surface in the vehicle width direction of the steel plate and the upper wall of the front side frame, the coupling strength between the damper base and the front side frame is further increased. Can do.

  According to the ninth aspect of the present invention, the damper base, the upper member, the lower member, and a part of the wheel house are assembled as a subassembly, and the subassembly is welded to the front pillar and the front side frame. Productivity is improved compared to individual assembly.

The perspective view of the vehicle body front part of a motor vehicle. FIG. 2 is an enlarged view of part 2 of FIG. 1. FIG. 3 is a three-direction arrow view of FIG. 2. FIG. 4 is a four-direction arrow view of FIG. 1. FIG. 5 is a view in the direction of arrows 5 in FIG. 2. 6A-6A line of FIG. 4 and 6A-6A line sectional drawing. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined with reference to an occupant seated in the driver's seat.

  As shown in FIG. 1, the vehicle body front portion includes a floor 11 constituting a floor surface of a passenger compartment, a pair of left and right side sills 12, 12 extending in the front-rear direction along both left and right side portions of the floor 11, A pair of left and right front pillar lowers 13 and 13 standing from the front ends of the side sills 12 and 12, a pair of left and right front pillar uppers 14 and 14 extending rearward and upward from the upper ends of the left and right front pillar lowers 13 and 13, and the front end of the floor 11 A dash panel lower 15, which stands upright and connects the left and right front pillar lowers 13, 13, a pair of left and right front side frames 16, 16 extending forward from the front end of the floor 11, and upper ends of the left and right front pillar lowers 13, 13. A pair of left and right rectangular cross-section members 17, 17 connected to each other and a pair of left and right rectangular cross-section members 17, 17 extending forward from the front ends Comprises a Ppamenba 18, a pair of right and left lower member 19, 19 extending from the front end of the left and right upper members 18, 18 before the lower and the vehicle width direction inner side.

  Further, the front part of the vehicle body includes a pair of left and right connecting members 20, 20 that connect the front ends of the left and right front side frames 16, 16 and the front ends of the left and right lower members 19, 19 in the vehicle width direction, and a left and right connecting member 20. , 20, a pair of left and right bumper beam extensions 21, 21 connected to the front surface, a bumper beam 22 connecting the front ends of the left and right bumper beam extensions 21, 21 in the vehicle width direction, and left and right bumper beam extensions 21, 21 A rectangular frame-shaped front bulkhead 23 supported between the rear ends, and a pair of left and right front bulkheads connecting the upper left and upper right corners of the front bulkhead 23 to the middle portions of the left and right lower members 19, 19. Upper side 24, 24, left and right front side frames 16, 16 Fine left and right upper members 18, 18 while it is connected by aluminum casting made of a pair of left and right alloy damper base 25, 25. Each member excluding the damper bases 25, 25 is basically formed by press-molding a steel plate.

  As shown in FIGS. 2, 5 and 6A, the upper member 18 includes a member having a substantially L-shaped cross section having an upper wall 18a, a vehicle width direction outer wall 18b, an upper flange portion 18c, and a lower flange portion 18d. The lower wall 18e, the vehicle width direction inner wall 18f, the upper flange portion 18g, and the lower flange portion 18h having a substantially L-shaped cross section are welded to the upper flange portions 18c and 18g, and the lower flange portions 18d and 18h are connected to each other. Are formed into a rectangular closed cross section. The bulkhead 26 in the upper member disposed inside the upper end of the upper member 18 includes a rectangular partition wall portion 26a, and four flange portions 26b... Bent four sides of the partition wall portion 26a at right angles. Three of the flange portions 26b are welded to the inner surfaces of the upper wall 18a, the vehicle width direction outer wall 18b, and the lower wall 18e of the upper member 18.

  As shown in FIGS. 2, 3 and 5, the damper base 25 has an upper wall 25a, a front wall 25b, a rear wall 25c, an outer wall 25d in the vehicle width direction and an inner wall 25e in the vehicle width direction, and has a box shape whose lower surface is open. A front reinforcing rib 25f extending in parallel with the front wall 25b and connecting the vehicle width direction outer wall 25d and the vehicle width direction inner wall 25e, and a vehicle width direction outer wall extending in parallel with the rear wall 25c. 25d and a rear reinforcing rib 25g that connects the inner wall 25e in the vehicle width direction are formed. The upper arm 27 (see FIG. 5) of the suspension device for the front wheel has a front end and a rear end bifurcated, and the front end is connected to the front wall 25b of the damper base 25 and the front reinforcing rib via the front rubber bush joint 28. The rear end is supported between the rear wall 25c of the damper base 25 and the rear reinforcing rib 25g via the rear rubber bush joint 29 so as to be vertically swingable.

  Of the outer wall 25d in the vehicle width direction of the damper base 25, the position corresponding to the outer side in the vehicle width direction of the rear rubber bush joint 29 is the remaining one flange of the inner wall 18f in the vehicle width direction of the upper member 18 and the bulk head 26 in the upper member. Three pieces are overlaid on the portion 26b and fastened with bolts 30 and nuts 31 extending in the vehicle width direction.

  As shown in FIGS. 2 and 6B, the lower member 19 includes a substantially L-shaped cross-section member having an upper wall 19a, a vehicle width direction outer wall 19b, an upper flange portion 19c, and a lower flange portion 19d, and a lower wall 19e. A member having a substantially L-shaped cross section having an inner wall 19f in the vehicle width direction, an upper flange portion 19g and a lower flange portion 19h, the upper flange portions 19c and 19g are welded together, and the lower flange portions 19d and 19h are welded together. Constructed in a rectangular closed section. The bulkhead 32 in the lower member disposed inside the middle part in the front-rear direction of the lower member 19 includes a rectangular partition wall portion 32a and two first flange portions 32b in which the lower side of the partition wall portion 32a and the inner side in the vehicle width direction are bent at right angles. , 32c and two second flange portions 32d, 32e obtained by bending the upper side of the partition wall portion 32a and the outer side in the vehicle width direction at right angles.

  The two first flange portions 32b, 32c of the inner bulkhead 32 in the lower member are spot welded to the inner surface of the lower wall 19e of the lower member 19 and the inner wall 19f in the vehicle width direction, and the two second flange portions 32d, 32e passes through slit-like openings 19i and 19j formed in the upper wall 19a and the vehicle width direction outer wall 19b of the lower member 19 and then is bent at a right angle to be formed on the outer surfaces of the upper wall 19a and the vehicle width direction outer wall 19b. Mig welded.

  As shown in FIGS. 2 and 3, an L-shaped connecting bracket 33 is welded on the ridge line between the upper wall 19 a of the lower member 19 and the outer wall 19 b in the vehicle width direction. The outer end in the vehicle width direction of the front bulkhead upper side 24 is fastened to the portion with a bolt. The front wall 25b of the damper base 25, the vehicle width direction inner wall 19f of the lower member 19, and the upper wall 16a of the front side frame 16 are connected by a part 34F of the wheel house, and the rear wall 25c of the damper base 25, The inner wall 19f in the vehicle width direction of the lower member 19 and the upper wall 16a of the front side frame 16 are connected by a part 34R of the wheel house.

  As shown in FIGS. 2, 4, and 5, the bulkhead 26 in the upper member faces the vicinity of the rear wall 25 c of the damper base 25. The bulkhead 32 in the lower member faces the vicinity of the connection portion of the rear end of the connecting bracket 33 to the lower member 19 and the upper end of the part 34F of the wheel house.

  2 and 3, the vehicle width direction outer wall 25d of the damper base 25 is connected to the vehicle width direction inner wall 18f of the upper member 18 via a plurality of rivets 35. A steel plate 36 is fixed to the vehicle width direction inner wall 25e of the damper base 25 by a plurality of rivets 37. The steel plate 36 is fixed to the vehicle width direction outer wall 16b of the front side frame 16 and the vehicle width direction inner wall of the damper base 25. It welds through the several window hole 25h ... formed in 25e. A gusset 38 having an L-shaped cross section is welded to the inner surface in the vehicle width direction of the steel plate 36 and the upper wall 16 a of the front side frame 16.

  As shown in FIGS. 4 and 7, the rectangular cross-section member 17 that constitutes a part of the front pillar lower 13 and is connected to the front pillar upper 14, the lower end, and the rear end of the upper member 18 includes a cowl side inner 39, The cowl side outer 40, the cowl side upper 41 and the cowl side lower 42 are connected to form a closed cross section. Further, the rear portions of the left and right rectangular cross-section members 17, 17 are connected to both ends of the front cowl 43 and the front windshield lower support 44 extending in the vehicle width direction.

  As shown in FIGS. 2 and 3, the damper base 25, the steel plate 36, the upper member 18, the lower member 19, and the front and rear wheel house portions 34F and 34R are assembled in advance as a subassembly 45. The front side frame 16 and the front pillar upper 14 are coupled to the rectangular cross-section member 17 collectively.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  A load from the front wheel is inputted to the damper base 25 that supports the upper end of the damper of the front suspension and the bifurcated base end of the upper arm 27 (see FIG. 5). The load is applied to the rectangular cross-section member 17 from the upper member 18. To the front pillar lower 13 and the front pillar upper 14, and from the upper member 18 to the front bulkhead 23 via the lower member 19 and the front bulkhead upper side 24, and directly from the damper base 25 to the front side frame. 16 is absorbed and absorbed.

  At this time, the bulkhead 26 in the upper member is disposed inside the upper member 18 facing the rear end of the damper base 25, and the interior of the lower member 19 facing the coupling bracket 33 for connecting the front bulkhead upper side 24 Therefore, even if the rigidity of the damper base 25 made of aluminum alloy is higher than the rigidity of the upper member 18 and the lower member 19 made of steel plate, the bulkhead 26 in the upper member and the bulkhead in the lower member are arranged. By increasing the rigidity of the upper member 18 and the lower member 19 at 32, the load input from the damper or the upper arm 27 to the damper base 25 is efficiently transmitted to the upper member 18, the lower member 19, and the front bulkhead upper side 24. It can be to support.

  In particular, the bulkhead 32 in the lower member includes a quadrangular partition wall portion 32a that partitions the interior of the lower member 19 having a quadrangular cross section, and two first flange portions 32b and 32c that are bent from two adjacent sides of the partition wall portion 32a. The partition portion 32a includes two second flange portions 32d and 32e bent from the other two sides adjacent to each other. The first flange portions 32b and 32c are spot-welded to the inner surface of the lower member 19, and the second flange portion 32d and 32e are MIG welded to the outer surface of the lower member 19 while passing through the openings 19i and 19j formed in the lower member 19 from the inside to the outside, so that the four sides of the partition wall portion 32a of the bulkhead 32 in the lower member are connected to the four sides of the lower member 19. Not only can the rigidity be increased by connecting to the four inner surfaces, but the lower wall 19e and the vehicle width direction inner wall 19f are In a state where the member bulkhead 32 is assembled, the upper wall 19a and the vehicle widthwise outer wall 19b can be assembled from the outside in the vehicle width direction, and the lower member bulkhead 32 is easily fixed inside the lower member 19 having a closed cross section. can do.

  Moreover, the L-shaped connecting bracket 33 that connects the front bulkhead upper side 24 to the lower member 19 is provided on the ridge line between the upper wall 19a of the lower member 19 and the outer wall 19b in the vehicle width direction, so the lower member 19 and the front bulkhead upper The rigidity of the connecting portion with the side 24 can be increased, and the load input to the damper base 25 can be efficiently transmitted from the lower member 19 to the front bulkhead 23 via the front bulkhead upper side 24 and supported.

  Further, of the front and rear wheel house parts 34F and 34R, the front wheel house part 34F connects the front side frame 16 and the lower member 19 in the vertical direction, and the upper end thereof faces the bulkhead 32 in the lower member. Therefore, the rigidity of the connecting portion between the lower member 19 and the front bulkhead upper side can be further enhanced by the part 34F of the front wheel house.

  Further, the bulkhead 26 in the upper member includes a quadrangular partition wall portion 26a for partitioning the inside of the upper member 18 having a quadrangular cross section, and four flange portions 26b... Bent from four sides of the partition wall portion. 26b... Are connected to the inner surface of the upper member 18, and the remaining one flange portion 26b is mechanically fastened with bolts 30 and nuts 31 on the upper member 18 and the outer wall 25d of the damper base 25 in the vehicle width direction. Therefore, the load input to the damper base 25 can be efficiently transmitted to and supported by the upper member 18 via the high-strength three-layer mechanical fastening portion.

  Further, since the rear end of the upper member 18 is connected to the front pillar lower 13 via a highly rigid rectangular cross-section member 17 having a closed cross section, a load input to the damper base 25 is transferred from the upper member 18 to the rectangular cross-section member 17. Thus, it can be efficiently transmitted to and supported by the front pillar lower 13.

  By the way, although the aluminum alloy damper base 25 is difficult to weld, since the vehicle width direction outer wall 25d of the damper base 25 is fastened to the vehicle width direction inner wall 18f of the upper member 18 by the rivets 35. The base 25 and the upper member 18 made of steel plate can be firmly bonded. Further, the steel plate 36 is fastened to the vehicle width direction inner wall 25e of the damper base 25 with rivets 37, and the steel plate 36 is welded to the vehicle width direction outer wall 16b of the front side frame 16, so that the damper base 25 made of aluminum alloy is difficult to weld. Can be firmly bonded to the front side frame 16 made of steel plate.

  At this time, since the gusset 38 having an L-shaped cross section is welded to the inner surface in the vehicle width direction of the steel plate 36 and the upper wall 16a of the front side frame 16, the coupling strength between the damper base 25 and the front side frame 16 can be further increased. it can.

  The damper base 25, the upper member 18, the lower member 19, and the front and rear wheel house parts 34F and 34R are assembled as a subassembly 45 (see FIGS. 2 and 3), and the subassembly 45 is a part of the front pillar lower 13. Since it welds to the rectangular cross-section member 17 and the front side frame 16, productivity improves compared with the case where each member of the subassembly 45 is assembled | attached separately.

  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.

11 Floor 13 Front pillar lower (front pillar)
16 Front side frame 16a Upper wall 16b Vehicle width direction outer wall 17 Rectangular section member 18 Upper member 18f Vehicle width direction inner wall 19 Lower member 19a Upper wall 19b Vehicle width direction outer wall 19i Opening 19j Opening 20 Connecting member 23 Front bulkhead 24 Front bulkhead upper Side 25 Damper base 25d Vehicle width direction outer wall 25e Vehicle width direction inner wall 26 Upper member bulkhead 26a Bulkhead portion 26b Flange portion 32 Lower member bulkhead 32a Bulkhead portion 32b First flange portion 32c First flange portion 32d Second flange portion 32e Second flange portion 33 Connecting bracket 34F Part of wheel house (reinforcing member)
34R Part of wheel house 35 Rivet 36 Steel plate 37 Rivet 38 Gusset 43 Front cowl 45 Subassembly

Claims (9)

A front side frame (16) extending forward from the floor (11), a steel plate upper member (18) extending substantially horizontally forward from the front pillar (13), and from the front end of the upper member (18) to the front lower side A steel plate extending lower member (19), a connecting member (20) connecting the front end of the lower member (19) and the front end of the front side frame (16), and the left and right front side frames (16) are connected. A rectangular frame-shaped front bulkhead (23), and a front bulkhead upper side (24) for connecting the vehicle width direction end portion of the upper side of the front bulkhead (23) to the middle portion in the front-rear direction of the lower member (19) A vehicle body structure comprising:
An outer wall (16b) in the vehicle width direction of the front side frame (16) and an inner wall (18f) in the vehicle width direction of the upper member (18) are connected by a damper base (25) made of aluminum alloy, and the lower member (19) A part in which the bulkhead (32) in the lower member is disposed inside a part to which the front bulkhead upper side (24) is connected, and a rear end of the damper base (25) is connected to the upper member (18) A vehicle body structure for an automobile, wherein the bulkhead (26) in the upper member is disposed inside the vehicle.   The bulkhead (32) in the lower member is bent from two sides adjacent to each other of a quadrangular partition wall portion (32a) for partitioning the interior of the lower member (19) having a quadrangular cross section and the partition wall portion (32a). Two first flange portions (32d, 32e) bent from the other two sides adjacent to each other of the partition wall portion (32a), and the first flange portion (32b, 32c). The parts (32b, 32c) are connected to the inner surface of the lower member (19), and the second flange parts (32d, 32e) pass through the openings (19i, 19j) formed in the lower member (19) from the inside to the outside. 2. The vehicle body structure according to claim 1, wherein the vehicle body structure is connected to an outer surface of the lower member (19) in a state where the vehicle body is in a closed state.   An L-shaped connection bracket (33) is provided on the ridge line between the upper wall (19a) and the vehicle width direction outer wall (19b) of the lower member (19), and the front bulk is provided on the connection bracket (33). The vehicle body structure according to claim 1 or 2, characterized in that a head upper side (24) is connected.   A reinforcing member (34F) for vertically connecting the front side frame (16) and the lower member (19) is provided, and an upper end of the reinforcing member (34F) faces the bulkhead (32) in the lower member. The vehicle body structure according to any one of claims 1 to 3.   The bulkhead (26) in the upper member includes a quadrangular partition wall portion (26a) for partitioning the inside of the upper member (18) having a quadrangular cross section, and four flange portions bent from four sides of the partition wall portion (26a). (26b), the three flange portions (26b) are connected to the inner surface of the upper member (18), and the remaining one flange portion (26b) is connected to the upper member (18) and the damper base ( 25) The vehicle body structure according to any one of claims 1 to 4, wherein the vehicle body structure is mechanically fastened in a three-ply manner.   The said upper member (18) is connected to the said front pillar (13) via the rectangular cross-section member (17) located in the vehicle width direction outer end of a front cowl (43). The vehicle body structure according to any one of claims 5 to 6. A method for manufacturing an automobile according to any one of claims 1 to 6,
The outer wall (25d) in the vehicle width direction of the damper base (25) is fastened to the inner wall (18f) in the vehicle width direction of the upper member (18) with a rivet (35), and the inner wall in the vehicle width direction of the damper base (25) ( 25e), a steel plate (36) is fastened with rivets (37), and the steel plate (36) is welded to the outer wall (16b) in the vehicle width direction of the front side frame (16).   The gusset (38) having an L-shaped cross section is welded to the inner surface in the vehicle width direction of the steel plate (36) and the upper wall (16a) of the front side frame (16). Manufacturing method of automobile. The damper base (25), the upper member (18), the lower member (19) and a part of the wheel house (34F, 34R) are assembled as a subassembly (45), and the subassembly (45) is assembled to the front pillar ( The method for manufacturing an automobile according to claim 7 or 8, wherein welding is performed to 13) and the front side frame (16).

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