JP4392293B2 - Manufacturing method of body frame - Google Patents

Description

  The present invention relates to a method of manufacturing a vehicle body frame, and more particularly to a method of manufacturing a vehicle body frame that connects frame members made of different metal materials.

  Various body frames such as side front frames of automobiles have been proposed that are lightweight and can efficiently absorb impact energy by plastic deformation when impacted or contacted (for example, Patent Document 1).

  However, aluminum-based materials are inferior to iron-based materials in terms of strength, formability, weldability, cost, and the like, so it is difficult to replace all body frames with aluminum-based materials. Further, when resistance welding is performed between an iron-based material and an aluminum-based material, there is a concern that electrochemical corrosion due to a difference in ionization tendency due to contact between different metal materials, that is, so-called electrolytic corrosion occurs.

  Therefore, a body frame is manufactured by bolting an iron-based frame member and an aluminum-based frame member via an adapter with an anti-corrosion treatment that forms an insulating film on the surface, regardless of welding. It is possible.

  For example, as shown in an exploded perspective view of the main part in FIG. 15, a cylindrical rear frame member 111 formed by an outer panel 112 and an inner panel 113 made of an iron-based material in which a cylindrical body is formed in half, and a cylinder When joining the front frame member 115 made of an aluminum-based material extruded into a cylindrical shape, the front frame from the other end surface of the rear side joint portion 122 and the base portion 121 projecting in a cylindrical shape from one end surface of the plate-like base portion 121. An adapter 120 made of an aluminum material is prepared, which includes a pair of front side joints 123 and 124 projecting on the inner periphery of the end portion of the member 115 and having an insulating coating formed on the surface by electrodeposition coating or the like.

  Then, the end portion 112a of the outer panel 112 facing each other and the end portion 113a of the inner panel 113 are fitted to the outer periphery of the rear side joining portion 122 of the adapter 120, and the outer flanges 112 and the upper flange of the inner panel 113 facing each other are fitted. 112b and 113b and the lower flanges 112c and 113c are welded together, and the adapter 120 rear joint 122 and the outer panel 112 end 112a and the rear panel joint 122 and the inner panel 113 end 113a are fitted together. Are coupled by bolts 125.

  Alternatively, the upper flanges 112b and 113b and the lower flanges 112c and 113c facing each other of the outer panel 112 and the inner panel 113 are connected in advance to form a cylindrical rear frame member 111, and each end portion of the outer panel 112 and the inner panel 113 is formed. The adapter 120 is coupled to the rear frame member 111 by inserting the rear side joint portion 122 of the adapter 120 into the opening formed by the portions 112 a and 113 a and coupling the rear portion 122 with the bolt 125.

  The front frame members 115 that are fitted to each other are fitted with the end portions 115a of the front frame members 115 in the front side joint portions 123 and 124 formed to project from the adapter 120 coupled to the rear frame member 111. The end portion 115a and the front side joint portions 123 and 124 are coupled by a bolt 125.

JP-A-8-216916

  However, as shown in FIG. 15, a frame in which the rear frame member 111 of the iron-based material and the front frame member 115 of the aluminum-based material are connected by the bolt 125 with the adapter 120 of the aluminum-based material having an insulating film formed on the surface thereof. According to the structure, when the end portion 112a of the outer panel 112 and the end portion 113a of the inner panel 113 are fitted to the rear side joint portion 122 of the adapter 120 in the assembly, the end portion 112a of the outer panel 112 or the end of the inner panel 113 is fitted. There is a concern that the insulating coating applied to the rear joint portion 122 of the adapter 120 by the portion 113a is damaged due to scratches or the like, that is, the insulating coating is peeled off.

  Similarly, the upper flanges 112b and 113b and the lower flanges 112c and 113c facing each other of the outer panel 112 and the inner panel 113 are connected in advance to form a cylindrical rear frame member 111, which is formed by the ends 112a and 113a. Even when the rear side joint portion 122 of the adapter 120 is inserted into the opening and coupled with the bolt 125, the end portion 112 a of the outer panel 112 and the end portion 113 a of the inner panel 113 are attached to the surface of the rear side joint portion 122 of the adapter 120. There is concern over damage to the applied insulating coating.

  When the insulating coating applied to the aluminum-based material adapter 120 is damaged in this way, the rear-side joint portion 122 of the aluminum-based material adapter 120 and the end portion 112a of the iron-based material outer panel 112 and the inner panel 113 at the portion, There is a concern that the electric corrosion is promoted by the contact of the 113a directly or the retention of moisture that has entered the portion.

  Similarly, the occurrence of electrolytic corrosion is also a concern in other vehicle body frames that connect frame members of different metal materials through adapters.

  Accordingly, an object of the present invention made in view of such points is to provide a method of manufacturing a vehicle body frame made of a frame member made of a dissimilar metal material having excellent electric corrosion resistance.

  The invention of a manufacturing method of a vehicle body frame according to claim 1 that achieves the above object is characterized in that the first frame member and the second frame member having a hollow section and having a closed cross section are surfaced with the first frame member and a dissimilar metal material. In the method of manufacturing a vehicle body frame that is connected via an adapter having an anti-corrosion treatment to form an insulating coating on the first frame member, the first frame member is opposed to the lower side wall from both ends of the lower side wall in the axial direction. A first panel member having a substantially U-shaped cross section in which an inner wall and an outer wall that are gradually separated from each other as it moves toward an axially open portion that is opened along the outer side, and an inner wall and an outer side of the first panel member An upper side wall spanned between the axially open side portions of the wall, and a second panel member formed with an inner flange and an outer flange coupled to the inner side wall and the outer side wall at each end of the upper side wall, Above a The stopper has an inner abutting surface that is inserted into the hollow portion of the first frame member and can abut against the inner surface of the inner wall, and contacts the inner wall that is bolted to the inner wall and the inner surface of the outer wall. A first frame coupling portion having an outer abutting surface that can be contacted and having an outer wall that is bolt-coupled to the outer wall; and the second frame member that is integrally formed with the first frame coupling portion. A second frame coupling portion, and the inner abutment surface and the outer abutment surface of the adapter are respectively abutted against the inner surfaces of the inner wall and the outer wall of the first panel member from the axially open portion side, respectively. A first panel member / adapter positioning step for fitting and positioning a panel member and a first frame coupling portion of the adapter, and a first panel member for bolting the positioned inner wall, inner wall, outer wall, and outer wall, respectively.・ Adapter connection A first panel member for welding and joining the inner side wall and the inner flange and the outer side wall and the outer flange by spanning an upper side wall between the axially open portions of the inner side wall and the outer side wall of the first panel member; And a second panel member coupling step.

  According to a second aspect of the present invention, in the method for manufacturing a vehicle body frame according to the first aspect, the first frame coupling portion of the adapter inserted into the hollow portion of the first frame member can contact the inner surface of the upper side wall. An upper wall having an upper abutting surface and bolted to the upper side wall, wherein the first panel member / second panel member coupling step comprises axial directions of the inner side wall and the outer side wall of the first panel member. The upper side wall is spanned between the open portions, the inner surface of the outer wall is brought into contact with the upper abutting surface, and the upper side wall and the upper wall are bolted together, and then the inner side wall and the inner flange and the outer wall and the outer flange are connected. They are characterized by being welded together.

  According to a third aspect of the present invention, in the method for manufacturing a vehicle body frame according to the first or second aspect, the adapter includes the first frame coupling portion and the second frame coupling portion, which are axial edges of the first panel member. The first panel member and the base for positioning the adapter are interposed so as to be integrated with each other.

  The invention of the method for manufacturing a vehicle body frame according to claim 4 that achieves the above object is characterized in that the first frame member and the second frame member having a hollow section and having a closed cross section are surfaced with the first frame member and a dissimilar metal material. In the method of manufacturing a vehicle body frame that is connected via an adapter having an anti-corrosion treatment to form an insulating coating on the first frame member, the first frame member faces the inner wall from the upper and lower edges of the inner wall. The upper inclined side wall and the lower inclined side wall that are gradually separated from each other and have an upper flange and a lower flange at the end edges are bent in the axial direction as they move toward the axially open portion that is opened along the axial direction. The first panel members having a substantially U-shaped continuous cross section and gradually spaced apart from each other as they move from the upper and lower edges of the outer wall toward the axially open portion facing the outer wall and opened along the axial direction. The upper inclined side wall and the lower inclined side wall each having an upper flange and a lower flange coupled to the upper flange and the lower flange of the first panel member, respectively, are bent at the end edges so as to be continuous in the axial direction. The adapter is inserted into the hollow portion of the first frame member, and the inner side wall, the upper inclined side wall, the lower inclined side wall, and the second panel of the first panel member. A first inner abutment surface, a first upper abutment surface, a first lower abutment surface, a second outer abutment surface, which can abut against the inner surfaces of the outer wall, the upper inclined side wall, and the lower inclined side wall of the member, A first inner wall, a first upper wall, a first lower wall, a second outer wall, a second upper wall, and a second lower wall having a second upper abutting surface and a second lower abutting surface are formed. 1 frame coupling portion and the first frame coupling portion are integrally formed with the above A second frame coupling portion to which the two frame members are coupled, and the first inner abutment surface, the first upper abutment surface, and the first lower abutment of the adapter from the axially open portion side of the first panel member. First panel member / adapter positioning for fitting and positioning the first panel member and the first frame coupling portion of the adapter by bringing the contact surfaces into contact with the inner surfaces of the first panel member, the inner side wall, the upper inclined side wall, and the lower inclined side wall, respectively. A first panel member / adapter coupling step for bolting the positioned first panel member and the first frame coupling portion of the adapter, and the second panel member from the axially open portion side of the second panel member. The inner surfaces of the outer side wall, the upper inclined side wall, and the lower inclined side wall are formed on the first frame coupling portion of the adapter coupled to the first panel member. On the lower abutment surface The second panel member / adapter positioning step for fitting and positioning the second panel member and the first frame coupling portion of the adapter by contact with each other, and the second frame member and the first frame coupling portion of the adapter being bolted A second panel member / adapter coupling step, and a first panel member coupled to the first frame coupling portion of the adapter and an upper flange facing each other of the second panel member are welded together, and a lower flange is coupled to each other. It has the 1st panel member and 2nd panel member coupling | bonding process joined by welding.

  According to a fifth aspect of the present invention, in the method for manufacturing a vehicle body frame according to the fourth aspect, the adapter includes the first frame coupling portion and the second frame coupling portion that are in contact with an axial edge of the first frame member. The first panel member and the second panel member are in contact with each other and a base portion for positioning the adapter is formed integrally.

  According to the first aspect of the present invention, in the first panel member / adapter positioning step, the inner side wall and the outer side wall are bent from both ends of the lower side wall so as to be separated from each other as they move to the axially open portion side. The inner face and the outer face of the first panel member having a substantially U-shaped cross section are applied to the inner and outer contact faces of the first frame coupling part of the adapter from the axially open part side. By fitting and positioning the first panel member and the first frame coupling portion of the adapter in contact with each other, sliding contact between the first panel member and the inner contact surface and the outer contact surface of the adapter is avoided, and the inner contact is achieved. Relative positioning of the first panel member and the adapter can be performed without damaging the insulating coating formed on the surface and the outer contact surface. The positioned first panel member and the adapter are bolted together in the first panel member / adapter joining step, and then the inner wall and outer wall of the first panel member are joined in the first panel member / second panel member joining step. Since the upper side wall is spanned between the axially open portions and the inner side wall and the inner side flange and the outer side wall and the outer side flange are welded to each other to form the first frame member having a hollow cross section, the adapter and the first frame member Insulating coatings formed on the inner and outer contact surfaces of the first frame coupling portion that become the contact portion with the first frame coupling portion are securely maintained without being damaged, and between the first frame member and the adapter. The occurrence of electrolytic corrosion in the case is avoided or extremely suppressed, and the durability of the vehicle body frame in which the first frame member and the second frame member made of different metal materials are connected via an adapter is improved.

  According to the second aspect of the present invention, in the first panel member / second panel member joining step, the upper side wall of the second panel member is brought into contact with the upper abutment surface and the upper side wall and the upper wall are joined by bolts. By doing so, it is possible to join the upper wall of the second panel member and the upper wall of the adapter without damaging the insulating coating formed on the surface of the upper contact surface.

  According to the third aspect of the present invention, the relative positioning of the first panel and the adapter can be facilitated by bringing the base of the adapter into contact with the axial end of the first panel member.

  According to the fourth aspect of the present invention, in the first panel member / adapter positioning step, the first inner contact surface, the first upper contact surface, the first lower contact surface of the first frame coupling portion of the adapter; The first frame coupling portion and the first frame member of the adapter can be fitted with each inner surface of the inner wall of the first panel member, the upper inclined side wall, and the lower inclined side wall in a state where sliding contact with each other is avoided, Relative positioning of the first panel member and the adapter can be performed without damaging the insulating coatings formed on the first inner contact surface, the first upper contact surface, and the first lower contact surface.

  The positioned first panel member and the adapter are bolted together in the first panel member / adapter coupling step, and then the second frame member formed in the adapter in the second panel member / adapter positioning step. The outer contact surface, the second upper contact surface, the second lower contact surface, and the inner surfaces of the second panel member outer wall, upper inclined wall, and lower inclined wall are fitted in a state where mutual sliding contact is avoided. The second panel member and the adapter can be positioned relative to each other without damaging the insulating coating applied to the surfaces of the second inner contact surface, the second upper contact surface, and the second lower contact surface. .

  The positioned second panel member and the adapter are bolted together in the second panel member / adapter joining step, and then the first panel member and the second panel member are joined in the first panel member / second panel member joining step. The first inner side of the first frame coupling portion that becomes the contact portion between the adapter and the first frame member by forming the first frame member having a hollow cross-sectional shape by welding the upper and lower flanges facing each other. Insulating coatings formed on the respective surfaces of the contact surface, the first upper contact surface, the first lower contact surface, the second outer contact surface, the second upper contact surface, and the second lower contact surface It is reliably maintained without breakage, and the occurrence of electrolytic corrosion between the first frame member and the adapter is avoided or extremely suppressed, and the first frame member and the second frame member made of different metal materials are connected via an adapter. Car body Durability of the over-time is improved.

  According to the invention described in claim 5, by making the base portion of the adapter abut on the axial end portion of the first panel member, relative positioning between the first panel member and the adapter can be facilitated. By making contact with the axial end of the second panel member, relative positioning between the second panel member and the adapter can be facilitated, and the first panel member / adapter positioning step and the first panel member / adapter positioning step are efficiently performed. Can be implemented.

  Embodiments of a method for manufacturing a vehicle body frame according to the present invention will be described below with reference to the drawings, taking a front side frame as an example.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view showing an outline of a main part of a front part of a vehicle body of an automobile, FIG. 2 is an enlarged view of a part A of FIG. 1, FIG. 3 is an exploded perspective view of FIG. 2 is a cross-sectional view taken along line II, and FIG. 6 is a cross-sectional view taken along line II-II in FIG. The arrow F indicates the front direction of the vehicle body.

  A front portion of the vehicle body 1 is partitioned into a vehicle compartment R and an engine room E by a toe board 2 extending in the vehicle width direction as shown in FIG. 1, and a rear part is a floor panel (not shown) from the lower part of the toe board 2. A front side frame 10 that is a pair of left and right vehicle body frames that are attached over the lower surface and extend in the vehicle body front direction F along both sides of the engine room E, and a left and right that extends in the vehicle body front direction F from the upper part of the toe board 2 A pair of front upper frames 3 is provided, and a strut tower 5 for front suspension is assembled between the front side frame 10 and the front upper frame 3.

  The front side frame 10 is attached from the lower part of the toe board 2 to the lower surface of the floor panel as shown in FIG. 2 which is an enlarged view of part A of FIG. 1 and in FIG. 3 is an exploded perspective view of FIG. A rear frame member 11 that is a first frame member of an iron-based material extending in the vehicle body front direction F, and aluminum that is connected to the front end of the rear frame member 11 via an adapter 31 and extends in the vehicle body front direction F. It is comprised by the front part frame member 21 which is the 2nd frame member of system material.

  As shown in FIGS. 3 and 5, the rear frame member 11 is bent upward so that the inner wall 14 and the outer wall 15 are separated from each other from both ends of the lower side wall 13, and the upper side is the upper side. A lower panel 12 as a first panel member extending in the longitudinal direction of the vehicle body with a substantially U-shaped cross-section with the axial opening portion 12A opened along the axial direction, ie, the longitudinal direction of the vehicle body, and the inner wall 14 and the outer side of the lower panel 12 An inner flange 18 and an outer flange 19 which are welded to the upper part of the inner wall 14 and the upper part of the outer wall 15 from both ends of the flat upper wall 17 fitted between the upper parts of the wall 15 are bent upward. A hollow closed cross-sectional shape having an upper panel 16 that is a second panel member extending in the front-rear direction, and a hollow portion extending in the front-rear direction of the vehicle body is formed by the lower panel 12 and the upper panel 16 It is configured.

  A pair of mounting holes 14b, 14c are formed along the front end edge 14a of the inner wall 14 of the lower panel 12, and similarly, mounting holes 15b facing the mounting holes 14b, 14c along the front end edge 15a of the outer wall 15. 15c is drilled. A mounting hole 17b is formed near the center of the front edge 17a of the upper wall 17 of the upper panel 16.

  On the other hand, as shown in FIGS. 3 and 6, the front frame member 21 includes an inner wall 22 and an outer wall 23 facing each other, and an upper wall 24 and a lower wall that connect the upper and lower ends of the inner wall 22 and the outer wall 23. 25 having a substantially rectangular cross section and having an inner space 22 and a lower space 28 partitioned by a partition wall 26 connecting the inner wall 22 and the central portion of the outer wall 23 and extending in the longitudinal direction of the vehicle body. It is formed by extrusion forming in a letter shape. Attaching holes 22b, 22c and 23b, 23c facing each other through the upper space 27 and the lower space 28 are formed along the rear edge of the inner wall 22 and the rear edge of the outer wall 23, respectively.

  As shown in FIGS. 3 to 6, the adapter 31 is in the form of a block made of an aluminum-based material, and is the lower side wall 13, the inner side wall 14, the outer side wall 15, and the upper panel of the lower panel 12 that is the axial edge of the rear frame member 11. A first surface 33 whose periphery can abut against the front end edges 13a, 14a, 15a, 17a of the upper side wall 16, and an inner side wall 22, an outer side wall 23, an upper side wall 24, and a lower side wall 25 of the front frame member 21. The base plate 32 has a rectangular plate shape on which a second surface 34 that can be brought into contact with each rear edge of the partition wall 26 is formed.

  A first frame coupling portion 35 that protrudes from the first surface 33 of the base portion 32 and can be fitted into the hollow portion of the rear frame member 11 is projected.

  The first frame coupling portions 35 are separated from each other as they move upward from both ends of the lower wall 36 and the lower wall 36 formed with the lower contact surface 36a that contacts the inner surface of the lower wall 13 of the lower panel 12 and the lower panel. The inner wall 37 and the outer wall 38 formed with the inner abutting surface 37a and the outer abutting surface 38a that respectively abut against the inner surfaces of the inner wall 14 and the outer wall 15, respectively, and between the upper ends of the inner wall 37 and the outer wall 38. The upper wall 39 formed with an upper surface 39a that is connected and abutted against the inner surface of the upper wall 17 of the upper panel 16 is formed in a substantially rectangular ring shape.

  The inner wall 37 and the outer wall 38 of the first frame coupling portion 35 are respectively formed on the inner wall 14 and the outer wall 15 of the lower panel 12 as shown in FIG. 4 and as shown in FIG. Screw holes 37b, 37c and 38b, 38c are formed corresponding to the drilled mounting holes 14b, 14c and 15b, 15c. The upper wall 39 has a screw hole 39b corresponding to the mounting hole 17b formed in the upper wall 17 of the upper panel 16.

  A second frame coupling portion 41 is formed on the second surface 34 of the base portion 32 so as to protrude from the upper space portion 27 and the lower space portion 28 of the front frame member 21.

  The second frame coupling portion 41 protrudes from the second surface 34 of the base portion 32 as shown in FIG. 3 and shows a cross-sectional view taken along the line II-II of FIG. 27 and inserted into the lower hollow portion 28, the first coupling portion 42 in which the side surface abuts against the inner surface of the inner wall 22 and the screw hole 42b is formed corresponding to the mounting hole 22b. The side surface is in contact with the inner surface of the outer wall 23 and the second coupling portion 43 is formed with a screw hole 43c corresponding to the mounting hole 22c. A third coupling portion 44 in which a screw hole 44b is formed corresponding to the hole 23b, and a side surface abutting against the inner surface of the outer wall 23 by being inserted into the lower hollow portion 28, and a screw hole 45c corresponding to the mounting hole 23c. Is formed by the fourth coupling portion 45 formed with . The adapter 31 thus formed is subjected to an anti-corrosion treatment that forms an insulating film on the surface by electrodeposition coating or plating.

  Next, a connection process between the rear frame member 11 and the front frame member 21 through the adapter 31 will be described with reference to FIGS. 7A to 7D and the flowchart of FIG.

  As schematically shown in FIG. 7A, the first frame coupling portion 35 of the adapter 31 is inserted into the lower panel 12 from the axially open portion 12A side of the lower panel 12, and the lower contact surface 36a of the lower wall 36 thereof. The inner contact surface 37a and the outer contact surface 38a are respectively brought into contact with the inner surfaces of the lower side wall 13, the inner side wall 14, and the outer side wall 15 of the lower panel 12 from the axial opening portion 12A side, and the first of the base 32 is provided. The surface 33 is brought into contact with the front end edge 13a of the lower side wall 13 of the lower panel 12, the front end edge 14a of the inner side wall 14, and the front end edge 15a of the outer side wall 15 so that the adapter 31 is fitted to the front part of the lower panel 12 and the lower panel 12 Relative positioning with the adapter 31 is performed (first panel member / adapter positioning step S1).

  In positioning and fitting the adapter 31 to the lower panel 12, the lower panel 12 is opposed so that the inner side wall 14 and the outer side wall 15 gradually move away from both ends of the lower side wall 13 as the axially open portion 12A side moves. On the other hand, as the inner contact surface 37a and the outer contact surface 38a continuously formed at both ends of the lower contact surface 36a of the first frame coupling portion 35 of the adapter 31 shift to the upper surface contact surface 39a side. The lower abutment surface 36a, the inner abutment surface 37a, and the outer abutment surface 38a formed on the first frame coupling portion 35 of the adapter 31 are formed so as to be gradually separated from each other from the axially open portion 12A side. The inner surface of the inner wall 14 of the lower panel 12 and the inner surface of the outer wall 15 are brought into contact with the inner surfaces of the lower wall 13, the inner wall 14, and the outer wall 15. Can be fitted in a state where sliding contact between the inner contact surface 37a and the outer contact surface 38a of the adapter 31 is avoided or sliding contact is extremely suppressed, and the lower contact surface 36a, the inner contact surface 37a, The lower panel 12 and the adapter 31 can be relatively positioned without damaging the insulating coating applied to the outer abutting surface 38a.

  Further, the first surface 33 of the base portion 32 is brought into contact with the front end edge 13a of the lower side wall 13 of the lower panel 12, the front end edge 14a of the inner side wall 14, and the front end edge 15a of the outer side wall 15, so that the adapter 31 is attached to the front portion of the lower panel 12. By fitting, the relative positioning of the lower panel 12 and the adapter 31 can be carried out easily and efficiently.

  Next, in a state where the first frame coupling portion 35 of the adapter 31 is fitted to the front portion of the lower panel 12 and the lower panel 12 and the adapter 31 are relatively positioned, as shown in FIG. The inner surface 14 of the inner wall 14 and the inner contact surface 37a of the inner wall 37 are brought into close contact with each other by the bolts 48 inserted through the mounting holes 14b, 14c formed in the wall 14 and screwed into the screw holes 37b, 37c. And the inner wall 37 is fastened. Similarly, the inner surface of the outer wall 15 and the inner contact surface 38a of the outer wall 38 are brought into close contact with each bolt 48 inserted through the mounting holes 15b and 15c formed in the outer wall 15 and screwed into the screw holes 38b and 38c. The lower panel 12 and the adapter 31 are integrally coupled by fastening the outer side surface 15 and the outer wall 38 (first panel member / adapter coupling step S2).

  Subsequently, as shown in FIG. 7C, the upper panel 16 is fitted between the upper portions of the inner wall 14 and the outer wall 15 facing each other from the axially open portion 12 </ b> A side of the lower panel 12, and the upper wall 17 is attached to the adapter 31. The upper abutment surface 39a of the upper wall 39 is brought into contact with the inner surface of the upper side wall 17, and the front edge 17a thereof is brought into contact with the first surface 33 formed on the base portion 32 of the adapter 31 so that the upper panel 16 and the adapter 31 Position relative to the lower panel 12. Further, the inner surface of the upper side wall 17 and the upper abutting surface 39a of the upper wall 39 are brought into close contact with each other by a bolt 48 inserted through the mounting hole 17b formed in the upper side wall 17 and screwed into the screw hole 36a. The upper wall 16 is fastened and the upper panel 16 and the adapter 31 are joined together.

  In connecting the adapter 31 and the upper panel 16, the upper panel 16 is fitted between the inner wall 14 and the outer wall 15 of the lower panel 12, and the inner surface of the upper wall 17 is brought into contact with the upper contact surface 39 a of the upper wall 39. Since the bolt 48 is used for fastening, sliding contact between the inner surface of the upper side wall 17 of the upper panel 16 and the upper contact surface 39a of the adapter 31 is avoided, and the insulating coating applied to the upper contact surface 39a is not damaged. .

  Next, as shown in FIG. 7D, the inner flange 18 and the outer flange 19 of the upper panel 16 fitted between the inner wall 14 of the lower panel 12 and the upper end of the outer wall 15 are respectively connected to the inner wall 14 of the lower panel 12. The rear frame member 11 is welded and joined to the upper portion of the outer wall 15 and the upper portion of the outer wall 15 to form a continuous closed frame shape (first panel member / second panel member joining step S3).

  Next, the first coupling portion 42 and the third coupling portion 44 of the second frame coupling portion 41 and the second coupling portion 43 and the fourth coupling portion 45 of the adapter 31 attached to the front end of the rear frame member 11 are respectively connected to the front portions. The upper space portion 27 and the lower space portion 28 of the frame member 21 are fitted to bring the rear edge of the front frame member 21 into contact with the second surface 34 of the base portion 32 of the adapter 31.

  As a result, the mounting holes 22b and 22c drilled in the inner wall 22 of the front frame member 21 and the screw holes 42b and 43c formed in the first coupling portion 42 and the second coupling portion 43 of the second frame coupling portion 51, Are aligned. Similarly, the mounting holes 23b and 23c drilled in the outer wall 23 and the screw holes 44b and 45c formed in the third coupling portion 44 and the fourth coupling portion 45 are aligned.

  The inner side wall 22 of the front frame member 21, the first coupling part 42, and the inner side wall 22 that are overlapped by the bolts 48 that are inserted from the aligned mounting holes 22b and 22c and screwed into the screw holes 42b and 43c. The second coupling part 43 is coupled. Similarly, the outer frame 23 and the third coupling portion 44 and the outer wall 23 and the fourth coupling portion 45 are coupled to each other by the bolts 48 inserted through the mounting holes 23b and 23c and screwed into the screw holes 44b and 45c. 11 is connected to the front frame member 21 with an adapter 31 interposed therebetween.

  As described above, when the iron-based material rear frame 11 and the aluminum-based material front frame member 21 are bolted via the adapter 31 made of an aluminum-based material and having an insulating coating formed on the surface, the adapter of the aluminum-based material is used. The lower contact surface 36a, the inner contact surface 37a, the outer contact surface 38a, the upper contact surface 39, and the base portion 32 of the first frame coupling portion 35 that are the contact portions between the iron 31 and the rear frame 11 of the ferrous material. The insulating coating formed on the surface of the first surface 33 is reliably maintained without being damaged, and the occurrence of electrolytic corrosion in the rear frame member 11 and the adapter 31 is avoided or extremely suppressed.

  Therefore, in the front side frame 10 in which the rear frame member 11 of the iron-based material and the front frame member 21 of the aluminum-based material are connected via the adapter 31 of the aluminum-based material, excellent electric corrosion resistance can be ensured and durability is ensured. The connection between the rear frame member 11 of the iron-based material excellent in strength, formability, weldability and cost, and the front frame member 21 of the aluminum-based material that is lightweight and excellent in impact energy absorption due to plastic deformation. Since the front side frame 10 is configured as described above, it is possible to secure a lightweight front side frame 10 that is excellent in impact absorption at the time of collision or contact.

  In the above embodiment, the front frame member 21 is connected after the rear frame member 11 and the adapter 31 are joined. However, the adapter 31 and the front frame 21 are connected in advance, and the rear adapter 31 and the lower panel 12 are connected accordingly. Further, the rear frame member 11 can be formed by combining the upper panel 16.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS.

  9 is a perspective view showing the main part of the front side frame in the present embodiment, FIG. 10 is an exploded perspective view of FIG. 9, FIG. 11 is an explanatory view of the adapter, FIG. 12 is a sectional view taken along the line III-III of FIG. 13 is a cross-sectional view taken along line IV-IV in FIG. The arrow F indicates the front direction of the vehicle body.

  As shown in FIGS. 9 and 10, the front side frame 50 includes a rear frame member 51 that is a first frame member made of an iron-based material extending in the vehicle body front direction F, and an adapter 71 at the front end of the rear frame member 51. And a front frame member 61 that is a second frame member made of an aluminum-based material that extends in the vehicle body front direction F. The front frame 61 has the same configuration as that of the front frame 21 in the first embodiment, and a detailed description thereof is omitted by attaching the same reference numerals to portions corresponding to the front frame 21.

  As shown in FIGS. 10 and 12, the rear frame member 51 is formed by an inner panel 52 that is a first panel member and an outer panel 56 that is a second panel member.

  The inner panel 52 is bent at an upper inclined side wall 54 that is bent obliquely upward from the upper edge of the inner wall 53 toward the outer side of the vehicle body, and is bent downward at the lower edge of the inner wall 53 toward the outer side of the vehicle body. The lower inclined side wall 55 is separated from the upper inclined side wall 54 as it moves outward from the vehicle body. The upper flange 54a and the lower flange 55a are bent at the edges of the upper inclined side wall 54 and the lower inclined side wall 55, respectively. The cross section is substantially U-shaped and extends in the longitudinal direction of the vehicle body.

  The outer panel 56 is bent at an upper inclined side wall 58 that is bent obliquely upward from the upper edge of the outer wall 57 toward the inside of the vehicle body, and is bent downward from the lower edge of the outer wall 57 toward the inside of the vehicle body. A lower inclined side wall 59 that is separated from the upper inclined side wall 58 as it moves inward of the vehicle body is formed, and an upper flange 58a and a lower flange 59a are bent at the edges of the upper inclined side wall 58 and the lower inclined side wall 59, respectively. It has a substantially U-shaped cross section and extends in the longitudinal direction of the vehicle body.

  These inner panel 52 and outer panel 56 are opened in the longitudinal direction of the vehicle body so that the axial openings 52A and 56A are opposed to each other, and upper flanges 54a and 58a and lower flanges 55a and 59a facing each other are welded. As a result, the inner panel 52 and the outer panel 56 are formed in a hollow closed cross-sectional shape having a hexagonal cross section and continuing in the longitudinal direction of the vehicle body.

  Mounting holes 53b and 53c are formed in the inner side wall 53 along the front end edge 52a serving as the axial end edge of the inner panel 52. Similarly, the outer wall 57 is disposed along the front end edge 56a serving as the axial end edge of the outer panel 56. The mounting holes 57b and 57c are formed in the first and second holes.

  The adapter 71 is in the form of a block made of an aluminum-based material, and has a first surface 73 that can contact the front end edge 52a of the inner panel 52 and the front end edge 56a of the outer panel 56 that form the rear frame member 51, and a front frame. It has a rectangular plate-like base portion 72 formed with a second surface 74 that can contact the rear end edge of the member 61.

  A first frame coupling portion 75 that can be inserted and fitted into the hollow portion of the rear frame member 51 protrudes from the first surface 73 of the base portion 72.

  The first frame coupling portion 75 abuts against the inner surfaces of the upper inclined side wall 54, the inner side wall 53, the lower inclined wall 55, and the lower inclined wall 59, the outer wall 57, and the upper inclined wall 58 of the outer panel 56. Possible first upper contact surface 76a, first inner contact surface 77a, first lower contact surface 78a, second lower contact surface 79a, second outer contact surface 80a, second upper contact surface The first upper wall 76, the first inner wall 77, the first lower wall 78, the second lower wall 79, the second outer wall 80, and the second upper wall 81 in which 81a is formed are continuously formed in a substantially annular shape. The first upper abutment surface 76a and the first lower abutment surface 78a are separated from each other as they move outward from the upper and lower edges of the first inner abutment surface 77a, and the second upper abutment surface 76a. The second lower contact surface 78a is formed so as to gradually separate from the upper and lower edges of the second outer contact surface 77a toward the inside of the vehicle body.

  Screw holes 77b and 77c are formed in the first inner wall 77 of the first frame coupling portion 75 corresponding to the mounting holes 53b and 53c formed in the inner wall 53 of the inner panel 52, and the second outer wall 80. Screw holes 80b and 80c are formed corresponding to mounting holes 57b and 57c formed in the outer wall 57 of the outer panel 56.

  A second frame coupling portion 82 is formed on the second surface 74 of the base portion 72 so as to protrude from the upper space portion 27 and the lower space portion 28 of the front frame member 61.

  As shown in FIGS. 10 and 13, the second frame coupling portion 82 protrudes from the second surface 74 of the base portion 72 and is inserted into the upper hollow portion 27 of the front frame member 61 to be formed on the inner surface of the inner wall 22. The first coupling part 83 in which the side surface abuts and the screw hole 82b is formed corresponding to the attachment hole 22b, and the side wall abuts on the inner surface of the inner side wall 22 by being inserted into the lower hollow part 28 and the attachment hole 22c. Correspondingly, a second coupling portion 84 having a screw hole 84c formed therein and a side surface abutting against the inner surface of the outer wall 23 inserted into the upper hollow portion 27 and a screw hole 85b corresponding to the mounting hole 23b are formed. The third coupling portion 85 and the fourth coupling portion 86 inserted into the lower hollow portion 28 and having side surfaces abutting against the inner surface of the outer wall 23 and having screw holes 86c corresponding to the mounting holes 23c. ing. The adapter 71 made of the aluminum-based material thus formed is subjected to an electric corrosion resistance treatment for forming an insulating film on the surface by electrodeposition coating or the like.

  Next, the connecting process of the rear frame member 51 and the front frame member 61 through the adapter 71 will be described with reference to the flowchart of FIG.

  The first frame coupling portion 75 of the adapter 71 is inserted into the inner panel 52 from the axial direction opening 52A side of the inner panel 52, and the first inner abutment surface 77a, the first upper abutment surface 76a, and the first lower side The contact surface 78a is brought into contact with the inner surfaces of the inner side wall 53, the upper inclined side wall 54, and the lower inclined side wall 55 of the inner panel 52 from the axially open portion 52A side, and the first surface 73 of the base portion 72 is brought into contact with the inner panel 52. Then, the adapter 71 is fitted into the front portion of the inner panel 52 so that the inner panel 52 and the adapter 71 are relatively positioned (first panel member / adapter positioning step S11).

  When the adapter 71 is fitted to the inner panel 52 and positioned, the inner panel 52 is arranged such that the upper inclined side wall 54 and the lower inclined side wall 55 are located on the axial opening portion 52A side from the upper and lower edges of the inner side wall 53. The first inner abutment surface 77a, the first upper abutment surface 76a, the first lower abutment surface 78a and the inner wall 53 of the inner panel 52 are formed so as to be gradually separated from each other. The first frame coupling portion 75 of the adapter 71 can be fitted to the front portion of the inner panel 52 in a state where sliding contact with the upper inclined side wall 54 and the lower inclined side wall 55 is avoided or extremely suppressed. The inner panel 52 and the adapter 71 can be relatively positioned without damaging the insulating coatings applied to the surfaces of the first inner contact surface 77a, the first upper contact surface 76a, and the first lower contact surface 78a.

  Further, the first surface 73 of the base portion 72 is brought into contact with the front end edge 52a of the inner panel 52 and the adapter 71 is fitted to the front portion of the inner panel 52, so that the relative positioning of the inner panel 52 and the adapter 71 is facilitated. Can be implemented efficiently.

  Next, the inner wall 54 and the inner surface of the inner wall 54 are inserted into the screw holes 77b and 77b through the mounting holes 53b and 53b formed in the inner wall 53 of the inner panel 52 while being positioned relative to each other. The inner wall 77 is brought into close contact with and fastened to integrally couple the inner panel 52 and the adapter 71 (first panel member / adapter coupling step S12).

  Next, the inner surfaces of the outer wall 57, the upper inclined wall 58, and the lower inclined wall 59 of the outer panel 56 are connected to the second outer abutting surface 80a formed on the first frame coupling portion 75 of the adapter 71, and the second upper abutting surface. The front surface edge 56a of the outer panel 56 is brought into contact with the first surface 73 of the base 72 so as to contact the first frame coupling portion 75 of the adapter 71 and the front of the outer panel 56. The outer panel 56 and the adapter 71 are relatively positioned by fitting the parts (second panel member / adapter positioning step S13).

  When the adapter 71 and the outer panel 56 are fitted together, the outer panel 56 is separated from the upper and lower edges of the outer wall 57 as the upper inclined side wall 58 and the lower inclined side wall 59 move toward the axially open portion 56A. The second outer abutment surface 77a, the second upper abutment surface 76a, the second lower abutment surface 78a and the outer wall 57 of the outer panel 56, the upper inclined side wall 58, and the lower inclined side wall 59 are slid. The first frame coupling portion 75 of the adapter 71 and the front portion of the outer panel 56 can be fitted in a state in which contact is avoided or sliding contact is extremely suppressed, and the second outer contact surface 77a and the second upper contact surface 76a can be fitted. The outer panel 56 and the adapter 71 can be relatively positioned without damaging the insulating coating applied to the surface of the second lower contact surface 78a.

  Further, the first surface 73 of the base portion 72 is brought into contact with the front end edge 56a of the outer panel 56, and the adapter 71 is fitted to the front portion of the outer panel 56, so that the relative positioning of the outer panel 56 and the adapter 71 can be performed easily and efficiently. Can be implemented.

  Next, the outer wall 57 and the second outer wall are respectively inserted by the bolts 88 inserted through the mounting holes 57b and 57c formed in the outer wall 57 of the outer panel 56 and screwed into the screw holes 80b and 80c in a state of being positioned relative to each other. The outer panel 56 and the adapter 71 are integrally coupled by tightly fastening and fastening 80 (second panel member / adapter coupling step S14).

  Next, the upper flanges 54a and 58a and the lower flanges 55a and 59a of the inner panel 52 and the outer panel 56 facing each other are welded to each other to form a continuous rear frame member 51 with a hollow closed cross-sectional shape (first panel member / Second panel member coupling step S15).

  Next, the first coupling portion 83 and the third coupling portion 84 of the second frame coupling portion 82 of the adapter 71 attached to the front end of the rear frame member 51 are respectively connected to the front portions of the second coupling portion 84 and the fourth coupling portion 86. The upper space 27 and the lower space 28 of the frame member 61 are fitted to bring the rear edge of the front frame member 21 into contact with the second surface 74 of the base 72 of the adapter 71.

  Accordingly, the mounting holes 22b and 22c drilled in the inner wall 22 of the front frame member 61 and the screw holes 83b and 84c formed in the first coupling portion 83 and the second coupling portion 84 of the second frame coupling portion 51, Are aligned. Similarly, the mounting holes 23b and 23c drilled in the outer wall 23 and the screw holes 85b and 86c formed in the third coupling portion 85 and the fourth coupling portion 86 are aligned.

  The inner side wall 22 of the front frame member 21, the first coupling portion 83, and the inner side wall 22 that are overlapped by the bolts 88 that are inserted from the aligned mounting holes 22b and 22c and screwed into the screw holes 83b and 84c. The second coupling part 84 is coupled. Similarly, the outer frame 23 and the third coupling portion 85 and the outer wall 23 and the fourth coupling portion 86 are coupled to each other by the bolts 88 inserted from the mounting holes 23b and 23c and screwed into the screw holes 85b and 86c. A front frame member 61 is connected to the front end of 51 via an adapter 71.

  Thus, when bolting the rear frame 51 of the iron-based material and the front frame member 61 of the aluminum-based material via the adapter 71 made of the aluminum-based material, the adapter 71 of the aluminum-based material and the rear frame of the iron-based material are used. 51, the first upper contact surface 76a, the first inner contact surface 77a, the first lower contact surface 78a, the second lower contact surface 79a, (2) An excellent insulating coating is reliably maintained without damaging the insulating coating formed on the outer contact surface 80a, the second upper contact surface 81a, and the first surface 73 of the base 72, and has excellent electric corrosion resistance. Can be secured, the durability of the front side frame 50 is improved, and the rear frame member 51 of the iron-based material excellent in strength, formability, weldability and cost, and impact energy due to light weight and plastic deformation Since configuring the front side frame 50 by the connection between the front frame member 61 of good aluminum-based material to yield excellent shock absorption upon collision or contact, lightweight front side frame 50 can be secured.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. Although the front side frame has been described as an example, it can also be applied to other body frames such as a rear side frame and a front upper side frame. Furthermore, although the case where the frame member made of an iron-based material and an aluminum-based material is connected has been described as an example, the frame member made of another dissimilar metal material can also be connected.

1 is a perspective view of a front part of a vehicle body showing an outline of a first embodiment according to the present invention. It is the A section enlarged view of FIG. FIG. 3 is an exploded perspective view of FIG. 2. It is explanatory drawing of an adapter. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is explanatory drawing of the coupling | bonding process of a rear part frame member, an adapter, and a front part frame member. It is a flowchart which shows the outline | summary of a coupling | bonding process. It is a perspective view which shows the principal part of the front side frame which shows the outline | summary of 2nd Embodiment by this invention. FIG. 10 is an exploded perspective view of FIG. 9. It is explanatory drawing of an adapter. It is the II-II sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a flowchart which shows the outline | summary of a coupling | bonding process. It is a figure explaining the coupling | bonding of the conventional front part frame member and rear part frame member.

Explanation of symbols

1 Body 10 Front side frame (body frame)
11 Rear frame member (first frame member)
12 Lower panel (first panel member)
12A Axial opening 13 Lower wall 14 Inner wall 14a Front end edge (axial end edge)
15 Outer wall 15a Front edge (Axial edge)
16 Upper panel (second panel member)
17 Upper wall 17a Front edge (Axial edge)
21 Front frame member (second frame part)
31 Adapter 32 Base 35 First frame coupling portion 36 Lower wall 36a Lower abutment surface 37 Internal wall 37a Inner abutment surface 38 Outer wall 38a Outer abutment surface 39 Upper wall 39a Upper abutment surface 41 Second frame coupling portion 50 Front side frame (body frame)
51 Rear frame member (first frame member)
61 Front frame member (second frame part)
52 Inner panel (first panel member)
52A Axial opening 52a Front edge (Axial edge)
53 Inner wall 54 Upper inclined side wall 54a Upper flange 55 Lower inclined side wall 55a Lower flange 56 Outer panel (second panel member)
56A Axial opening 56a Front edge (axial edge)
57 outer wall 58 upper inclined side wall 58a upper flange 59 lower inclined side wall 59a lower flange 61 second frame member 71 adapter 72 base 75 first frame coupling part 76 first upper wall 76a first upper abutting surface 77 first inner wall 77a First inner contact surface 78 First lower wall 78a First lower contact surface 79 Second lower wall 79a Second lower contact surface 80 Second outer wall 80a Second outer contact surface 81 Second upper wall 81a Second upper contact surface

Claims (5)

The first frame member and the second frame member having a closed cross-sectional shape having a hollow portion are connected to each other via an adapter subjected to an anti-corrosion treatment that forms an insulating coating on the surface of the first frame member and a dissimilar metal material. In the manufacturing method of the body frame,
The first frame member is
The inner side wall and the outer side wall that are gradually separated from each other as they move from both ends of the lower side wall to the side of the axially open portion that opens along the axial direction so as to face the lower side wall are bent and continuous in the axial direction. A first panel member having a substantially U-shaped cross section, an upper side wall spanned between the axially open side portions of the inner side wall and the outer side wall of the first panel member, and the inner side wall and the outer side wall at each end of the upper side wall. A second panel member formed with an inner flange and an outer flange to be joined,
The adapter is
The inner wall is inserted into the hollow portion of the first frame member and has an inner abutting surface capable of abutting on the inner surface of the inner wall, and can be abutted on the inner wall of the inner wall and the outer wall. A first frame coupling portion having an outer abutting surface and having an outer wall bolted to the outer wall; and a second frame member integrally formed with the first frame coupling portion and coupled to the second frame member. A frame coupling portion,
The first frame member and the adapter are connected to the first frame by contacting the inner contact surface and the outer contact surface of the adapter with the inner walls of the first panel member and the inner surfaces of the outer wall, respectively, from the axially open side. A first panel member / adapter positioning step for fitting and positioning the part;
A first panel member / adapter coupling step of bolting the positioned inner wall and inner wall and outer wall and outer wall;
A first panel member and a second panel, in which an upper side wall is stretched between the axially open portions of the inner side wall and the outer side wall of the first panel member, and the inner side wall and the inner side flange, and the outer side wall and the outer side flange are welded to each other. A vehicle body frame manufacturing method comprising: a member coupling step. The first frame coupling portion of the adapter inserted into the hollow portion of the first frame member has an upper wall that has an upper abutting surface that can abut against the inner surface of the upper side wall and is bolted to the upper side wall. And
The first panel member / second panel member coupling step includes:
The upper side wall is spanned between the axially open portion sides of the inner wall and the outer wall of the first panel member, the inner surface of the outer wall is brought into contact with the upper abutting surface, and the upper wall and the upper wall are bolted. 2. The method of manufacturing a vehicle body frame according to claim 1, wherein the inner wall and the inner flange, and the outer wall and the outer flange are joined by welding later. The adapter is
The first frame coupling portion and the second frame coupling portion are integrally formed with a base portion for positioning the first panel member and the adapter in contact with an axial end edge of the first panel member. The method for manufacturing a vehicle body frame according to claim 1 or 2. The first frame member and the second frame member having a closed cross-sectional shape having a hollow portion are connected to each other via an adapter subjected to an anti-corrosion treatment that forms an insulating coating on the surface of the first frame member and a dissimilar metal material. In the manufacturing method of the body frame,
The first frame member is
The upper and lower edges of the inner wall are gradually separated from each other as they move from the upper edge and the lower edge of the inner wall toward the axial opening portion facing the inner wall and opened along the axial direction. A first panel member having a substantially U-shaped cross section in which an upper inclined side wall and a lower inclined side wall are bent and continuous in the axial direction;
The upper flange of the first panel member is gradually separated from the upper edge and the lower edge of the first panel member as it moves from the upper edge and the lower edge of the outer wall toward the axially open portion facing the outer wall and opened along the axial direction. And an upper inclined sidewall having an upper flange and a lower flange coupled to the lower flange, and a lower inclined sidewall, and a second panel member having a substantially U-shaped cross-section that is continuous in the axial direction.
The adapter is
Inserted into the hollow portion of the first frame member, the inner wall of the first panel member, the upper inclined side wall, the lower inclined side wall, and the inner surface of the outer side wall, the upper inclined side wall, and the lower inclined side wall of the second panel member, respectively. A first inner contact surface, a first upper contact surface, a first lower contact surface, a second outer contact surface, a second upper contact surface, and a second lower contact surface that can be contacted. A first frame coupling portion on which an inner wall, a first upper wall, a first lower wall, a second outer wall, a second upper wall, and a second lower wall are formed; and the first frame coupling portion is integrally formed. A second frame coupling portion to which the second frame member is coupled,
The first inner abutment surface, the first upper abutment surface, and the first lower abutment surface of the adapter from the axially open portion side of the first panel member are respectively connected to the inner side wall and the upper inclined side wall of the first panel member, A first panel member / adapter positioning step for fitting and positioning the first panel member and the first frame coupling portion of the adapter in contact with each inner surface of the lower inclined side wall;
A first panel member / adapter coupling step of bolting the positioned first panel member and the first frame coupling portion of the adapter;
The inner surface of the outer wall of the second panel member, the upper inclined side wall, and the lower inclined side wall is formed on the first frame coupling portion of the adapter coupled to the first panel member from the axially open portion side of the second panel member. The second panel member / adapter that fits and positions the second panel member and the first frame coupling portion of the adapter by contacting the second outer contact surface, the second upper contact surface, and the second lower contact surface, respectively. Positioning process;
A second panel member / adapter coupling step of bolting the positioned second panel member and the first frame coupling portion of the adapter;
A first panel member and a second panel that weld-join the opposing upper flanges of the first panel member and the second panel member joined to the first frame joint part of the adapter and weld the lower flanges of each other. A vehicle body frame manufacturing method comprising: a member coupling step. The adapter is
The first frame coupling portion and the second frame coupling portion are integrally formed with a base portion for positioning the first panel member, the second panel member, and the adapter in contact with an axial end edge of the first frame member. The method for manufacturing a vehicle body frame according to claim 4.

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