Vehicle body structure and manufacturing method thereof

Abstract

To provide a vehicle body structure of a vehicle capable of achieving both enhancement of a vibration damping property and improvement in productivity of a vehicle and a method of manufacturing the vehicle body.SOLUTION: A vehicle body structure of a vehicle includes a side sill outer 20 extended in the longitudinal direction, a side sill inner 30 forming a closed cross section extended in the longitudinal direction in cooperation with the side sill outer 20, an outer front joint member 21 having a side wall part 21c fixed to an inner side in the vehicle width direction and approximately orthogonal to the vehicle width direction of the side sill outer 20, an inner front joint member 31 having an outer flange part 31c fixed to the outer side in the vehicle width direction and approximately orthogonal to the vehicle width direction of the side sill inner 30 to face the side wall part 21c, and a vibration damping adhesive member B bonding between the side wall part 21c and the outer flange part 31c and capable of damping vibration. A front end part of the side wall part 21c in the longitudinal direction of the side sill 2 and a front end part of the outer flange part 31c are formed to offset a prescribed distance in the longitudinal direction.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a vehicle body structure including an outer side member fixed to the inner side of an outer member in the vehicle width direction and having an outer surface portion substantially perpendicular to the vehicle width direction, and an inner side member fixed to the outer side of an inner member in the vehicle width direction and having an inner surface portion substantially perpendicular to the vehicle width direction and facing the outer surface portion, and a method for manufacturing the vehicle body. [Background technology]

[0002] Conventionally, vehicle frame members such as floor frames, side sills, pillars, roof side rails, and floor cross members are formed of one or more members and configured to have a closed cross section extending in the longitudinal direction. A vibration damping member made of a synthetic resin having viscoelastic properties is disposed inside the closed cross section of these frame members to improve the riding comfort of passengers. The vibration damping mechanism of the vibration damping member works by first storing the strain energy converted based on the torsional displacement of the skeletal member inside the vibration damping member (material) as shear strain, and then dissipating part of the stored strain energy as thermal energy, thereby damping vibration.

[0003] The vehicle body structure of Patent Document 1 has a side sill inner and a side sill outer rain which cooperate to form a closed cross section, a center pillar inner which divides the closed cross section of the side sill in the vehicle width direction, and a bulkhead which is disposed between the side sill inner and the center pillar inner and has a panel joint part which is joined to the side sill inner and a flange part which is joined to the center pillar inner. This bulkhead includes a rigid joint part where the panel joint part is abutted and joined to the side sill inner, and a soft joint part where the flange part is joined to the center pillar inner via a vibration damping member, and the center pillar inner has an extension part which extends outward in the vehicle width direction from the vicinity of the soft joint part and is joined to the side sill outer rain.

[0004] Generally, the main steps of a manufacturing method at the vehicle body stage are an assembly forming process for preparing each assembly such as an outer assembly corresponding to the outer part of the vehicle body and an inner assembly corresponding to the inner part of the vehicle body, an assembled body forming process for connecting and joining these assemblies to prepare an assembled body corresponding to the vehicle body in a vehicle state, and an electrodeposition coating process for immersing the assembled body in an electrodeposition liquid bath and baking and drying the assembled body after immersion. The outer assembly is composed of a roof assy, ​​a side frame assy, ​​etc., and the inner assembly is composed of an underbody assy, ​​etc. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-043137 A Summary of the Invention [Problem to be solved by the invention]

[0006] The vehicle body structure of Patent Document 1 fills the gap between the center pillar inner, which is an outer member, and the flange portion of the bulkhead, which is an inner member, with vibration damping material, thereby damping vibrations that occur in the floor panel, etc., using the torsional displacement of the side sill while the vehicle is traveling. However, with the technique of Patent Document 1, there is a risk that the vibration damping member may not be able to fully exert its vibration damping function.

[0007] Typically, the side frame assembly is made up of outer members such as a center pillar inner and a side sill outer, while the underbody assembly is made up of inner members such as a side sill inner including a bulkhead (joint member) and a floor panel. Then, in the subsequent adhesive material application process, a vibration-damping material with adhesive properties is applied to the flange portion (inner surface portion) of the bulkhead, and then in the assembly connection formation process, the underbody assy and the side frame assy are connected so that the flange portion and the center pillar inner are bonded via the vibration-damping material, to form the assembly connection before electrocoating, that is, the car body in a vehicle state.

[0008] On the other hand, in large parts such as underbody assemblies, the tolerances of the respective components are accumulated. When assembling (connecting) such large parts together, the cumulative tolerances of each part are concentrated at the connecting parts of the large parts, and there is a concern that in the completed assembled state (vehicle body in vehicle state), the inner surface of the flange portion and the outer surface of the center pillar inner will be separated, resulting in a significant increase in the separation distance. If the amount of vibration-damping material applied is small and the gap between the inner surface and the outer surface is not sufficiently filled with vibration-damping material, torsional displacement is not transmitted to the vibration-damping material, making it difficult to accumulate strain energy and causing the vibration-damping material to be unable to perform its vibration-damping function. Therefore, in the adhesive application step, it is possible to apply a sufficient amount of vibration damping material for connection between both surfaces, taking into consideration the maximum tolerance of the separation distance between the inner surface portion and the outer surface portion.

[0009] When an amount of vibration damping material is applied that is capable of connecting the inner surface portion and the outer surface portion of the vehicle body in the vehicle state at the maximum tolerance, the two surfaces can be bonded together even if the separation distance between the inner surface portion and the outer surface portion is at the maximum tolerance, and torsional displacement can be transmitted to the vibration damping material. However, if a sufficient amount of vibration-damping material as described above is applied to the connecting portion of the two-sided portions which is formed smaller than the maximum tolerance, i.e., has a small error, there is a possibility that the vibration-damping material will overflow (protrude) to the outside through the gap between the two-sided portions.

[0010] If the vibration damping material overflows from between the two surfaces, the overflowing portion of the vibration damping material is pressed (dragged) by the electrochemical coating liquid flowing inside the side sill as the vehicle body is transported in the subsequent electrochemical coating process, and ultimately the overflowing portion peels off from the connecting portion between the inner surface portion and the outer surface portion. The overflowing portion that peels off from the connecting portion may adhere to its own or another vehicle body surface, adversely affecting the quality of the exterior plate, and may also accumulate on the bottom of the tank and contaminate the electrochemical coating liquid in the tank. That is, it is not easy to achieve both the vibration damping properties of the vehicle and productivity.

[0011] An object of the present invention is to provide a vehicle body structure and a method for manufacturing the vehicle body, which are capable of achieving both vibration damping properties and productivity of the vehicle. [Means for solving the problem]

[0012] The vehicle body structure of claim 1 includes an outer member constituting an outer portion in the vehicle width direction of a framework member extending in the vehicle front-rear direction, an inner member constituting an inner portion in the vehicle width direction of the framework member and forming a closed cross section extending in the vehicle front-rear direction in cooperation with the outer member, an outer side member fixed to the inner side in the vehicle width direction of the outer member and having an outer surface portion substantially perpendicular to the vehicle width direction, and an inner side member fixed to the outer side in the vehicle width direction of the inner member and having an inner surface portion substantially perpendicular to the vehicle width direction and facing the outer surface portion, the vehicle body structure includes a vibration damping adhesive member that bonds between the outer surface portion and the inner surface portion and is capable of damping vibration, and the framework member In the vehicle body longitudinal direction, the inner surface portion is set to have a smaller longitudinal dimension than the outer surface portion, the front end portion of the inner surface portion is formed to be offset a predetermined distance rearward from the front end portion of the outer surface portion, and the rear end portion of the inner surface portion is formed forward from the rear end portion of the outer surface portion. The feature is that they are formed with a predetermined distance offset.

[0013] This vehicle body structure has a vibration-damping adhesive member that bonds the outer surface portion and the inner surface portion and is capable of damping vibrations. Therefore, the strain energy converted based on the torsional displacement of the outer member and the inner member is temporarily stored inside the vibration-damping adhesive member as shear strain, and vibrations are damped by dissipating a portion of the stored strain energy as thermal energy. The framework member In the vehicle body longitudinal direction, the inner surface portion has a smaller longitudinal dimension than the outer surface portion, the front end portion of the inner surface portion is offset a predetermined distance rearward from the front end portion of the outer surface portion, and the rear end portion of the inner surface portion is forward of the rear end portion of the outer surface portion.Therefore, even if a sufficient amount of vibration damping material is applied assuming the maximum tolerance in the vehicle state, the overflowing portion of the vibration damping adhesive material that overflows from the connecting portion between the inner surface portion and the outer surface portion will not be able to bond to the outer side portion. Material This can ensure that the overflow portion does not peel off. In addition, peeling of the overflowing portion at the front end portion, which is highly prone to peeling during the electrodeposition coating process, can be suppressed.

[0014] The invention of claim 2 is the invention of claim 1, wherein the outer surface portion and the inner surface portion are Lined up and down in parallel The cushion is characterized by being formed in a corrugated shape with projections and recesses on one side and a projection on the other side that are respectively engaged with each other when bonded together. This configuration ensures a sufficient bonding area while improving vibration damping.

[0015] The invention of claim 3 is characterized in that in the invention of claim 2, the vibration-damping adhesive material applied to the multiple recesses of the one surface portion bonds between the outer surface portion and the inner surface portion. With this configuration, it is possible to prevent the applied vibration-damping adhesive material from dripping down even if the product is left for a long time.

[0016]

[0017]

[0018] Claim 4 The invention is as follows: 3 In any one of the above-mentioned inventions, the framework member is a side sill. With this configuration, the vibration damping adhesive member can be arranged on the side sill, which has a large torsional displacement, and the vibration damping effect can be increased. Also, the side sill can be configured separately as a side frame assembly and an underbody assembly.

[0019] Claim 5 The invention is as follows: 4In the invention, the outer member is an inner panel of a pillar member extending upward from the side sill, or a joint member that divides the closed cross section into front and rear, and the inner member is a joint member that divides the closed cross section into front and rear. With this configuration, vibration damping can be achieved using an existing joint member.

[0020] Claim 6 The vehicle body manufacturing method includes an outer member constituting an outer portion in the vehicle width direction of a framework member extending in the vehicle front-rear direction, an inner member constituting an inner portion in the vehicle width direction of the framework member and forming a closed cross section extending in the vehicle front-rear direction in cooperation with the outer member, an outer side member fixed to an inner side in the vehicle width direction of the outer member and having an outer surface portion substantially perpendicular to the vehicle width direction, and an inner side member fixed to an outer side in the vehicle width direction of the inner member and having an inner surface portion substantially perpendicular to the vehicle width direction and facing the outer surface portion, the vehicle body manufacturing method includes an outer assembly process of forming an outer assembly by fixing the outer side member to the outer member, an inner assembly process of forming an inner assembly by fixing the inner side member to the inner member, and a vehicle body assembly process of forming an inner assembly by fixing the inner side member to the inner member. the outer assembly and the inner assembly are connected to each other so that one end of the outer assembly and one end of the inner assembly in the longitudinal direction of the frame member are offset by a predetermined distance in the longitudinal direction of the vehicle body, while the vibration-damping adhesive is interposed between the outer assembly and the inner assembly; and the electrodeposition coating process includes an electrodeposition liquid tank for immersing the outer assembly in the electrodeposition liquid tank so that the electrodeposition liquid flows in the longitudinal direction of the vehicle body, within the closed cross section of the outer assembly.

[0021] In the vehicle body manufacturing method, since it includes an outer assembly process of forming an outer assembly by fixing the outer side member to the outer member, and an inner assembly process of forming an inner assembly by fixing the inner side member to the inner member, the outer assembly and the inner assembly process can be produced independently. Since it includes an adhesive member application process of applying a vibration damping adhesive member having a vehicle width direction height capable of bonding the outer surface portion and the inner surface portion to at least one of the outer surface portion and the inner surface portion when the separation distance between the outer surface portion and the inner surface portion in the vehicle state is the maximum tolerance, it is possible to bond the outer surface portion and the inner surface portion to each other and to achieve vibration damping even if the separation distance between the outer surface portion and the inner surface portion is the maximum tolerance. Since the method includes an assembly connection formation process in which the vibration-damping adhesive member is interposed between the outer surface portion and the inner surface portion, and the outer assembly and the inner assembly are connected to form an assembly connection member so that one side end of the outer surface portion and one side end of the inner surface portion in the longitudinal direction of the frame member are offset by a predetermined distance in the fore-and-aft direction of the vehicle body, an adhesive portion to which the overflowing portion of the vibration-damping adhesive member can be adhered can be formed using one of the surface portions. Since the method includes an electrocoating process in which the assembled connected body is immersed in an electrocoating liquid tank so that the electrocoating liquid flows within the closed cross-section of the assembled connected body in the fore-and-aft direction of the vehicle body, electrocoating can be performed while preventing the overflowing portions of the vibration-damping adhesive material from peeling off.

[0022] Claim 7 The invention is as follows: 6 In the invention, the outer surface portion and the inner surface portion are each formed in advance in a corrugated shape having projections and recesses in the vehicle width direction, the adhesive applying step applies the vibration-damping adhesive to a plurality of recesses in one of the outer surface portion and the inner surface portion, and the assembly connected body forming step forms the assembly connected body so that the recesses in the one surface portion engage with the projections in the other surface portion. With this configuration, it is possible to prevent the applied vibration-damping adhesive from dripping, and it is possible to improve adhesion and vibration damping properties.

[0023] Claim 8 The invention is as follows: 7In the invention, the one side end is a front end in the vehicle body longitudinal direction, the assembled connected body forming step is characterized in that the front end of the one surface portion in the vehicle body longitudinal direction is disposed closer to the rear end side than the front end of the other surface portion in the vehicle body longitudinal direction, and the electrocoating step is characterized in that the assembled connected body is immersed from the front side in the vehicle body longitudinal direction. With this configuration, peeling of the overflowing portion of the front end portion, which has a high tendency to peel off in the electrocoating step, can be suppressed.

[0024] Claim 9 The invention is as follows: 6 ~ 8 In any one of the above-mentioned inventions, the framework member is a side sill, The outer member is an inner panel of a pillar member extending upward from the side sill, or a joint member that divides the closed cross section into front and rear, and the inner member is a joint member that divides the closed cross section into front and rear. With this configuration, vibration damping can be achieved using an existing joint member. Effect of the Invention

[0025] According to the vehicle body structure and vehicle body manufacturing method of the present invention, an adhesive portion to which the overflow portion of the vibration-damping adhesive member can be adhered is secured using an existing component, thereby making it possible to achieve both the vibration damping properties of the vehicle and productivity. [Brief description of the drawings]

[0026] [Figure 1] 1 is a perspective view of a main part of a vehicle according to a first embodiment, seen from the left side of the vehicle body. [Diagram 2] 4 is a perspective view of a region including a joint between a side sill and a center pillar with a side sill inner removed, as viewed from the inside in the vehicle width direction. FIG. [Diagram 3] FIG. 3 is a perspective view of FIG. 2 with the center pillar inner removed. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 2 is a cross-sectional view taken along line VV in FIG. 1. [Figure 6] 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7]7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 2 is a vertical cross-sectional perspective view of a front midway portion of the side sill. [Figure 9] FIG. 2 is a vertical cross-sectional perspective view of a middle portion of the side sill. [Figure 10] FIG. 13 is a perspective view of an outer front section member and an inner front section member. [Figure 11] 4 is a step chart showing a manufacturing procedure of a vehicle body. [Figure 12] FIG. [Figure 13] 1 is a step chart showing a processing procedure of an assembly forming process. [Figure 14] FIG. 2 is a perspective view of a side sill outer and a side sill inner before being joined together. [Figure 15] 11A and 11B are diagrams showing a transport form of an assembled connected body. [Figure 16] FIG. 2 is a cross-sectional view showing a schematic diagram of an electrodeposition liquid tank. [Figure 17] FIG. 2 is an enlarged cross-sectional view of the adhesive portion and its periphery. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, the embodiments of the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its uses. EXAMPLES

[0028] A first embodiment of the present invention will be described below with reference to FIGS. The vehicle V according to the first embodiment is a four-door hatchback vehicle equipped with two door openings A1, A2 on the left and right sides, respectively, and a lift gate (not shown) that can open and close the rear opening. As shown in FIG. 1, a vehicle V includes a floor panel 1 that forms the floor surface of the passenger compartment, a pair of left and right side sills 2 that extend in the fore-aft direction of the vehicle body, a pair of left and right roof side rails 3, a pair of left and right hinge pillars 4 that extend in the up-down direction, a pair of left and right center pillars 6, and a pair of left and right quarter pillars 7.

[0029] The floor panel 1 is formed with a tunnel portion 1a that protrudes upward from a central portion in the vehicle width direction and extends in the vehicle front-rear direction from a dash panel (not shown) to a kick-up portion. The pair of side sills 2 are provided to extend in the front-rear direction on both left and right ends of the floor panel 1. The pair of roof side rails 3 extending in the front-rear direction of the vehicle body are provided to extend in the front-rear direction on both left and right ends of the roof panel 3a (see FIG. 12), respectively. In addition, since the vehicle V has a bilaterally symmetrical structure, the following description will focus mainly on the structure and members on the left side. In addition, in the drawings, the direction of the arrow F is the forward direction, the direction of the arrow L is the leftward direction, and the direction of the arrow U is the upward direction.

[0030] 1, the hinge pillar 4 forms a closed cross section extending upward from the front end of the side sill 2, and is connected to the front end of the roof side rail 3 via a front pillar 5. The center pillar 6 extends upward from the center of the side sill 2 and is connected to an intermediate portion of the roof side rail 3. The quarter pillar 7 forms a closed cross section extending upward from the rear end of the side sill 2 (the front end of the wheel arch) and is connected to the rear end of the roof side rail 3.

[0031] As described above, the door opening A1 is formed into an annular closed cross-sectional structure by the front portion of the side sill 2, the front portion of the roof side rail 3, the hinge pillar 4, the front pillar 5, and the center pillar 6. Similarly, the door opening A2 is also formed into an annular closed cross-sectional structure by the rear portion of the side sill 2, the rear portion of the roof side rail 3, the center pillar 6, and the quarter pillar 7.

[0032] Next, the side sill 2 will be described. As shown in Figs. 2 to 9, the side sill 2 includes a side sill outer 20 extending in the front-rear direction, and a side sill inner 30 which cooperates with the side sill outer 20 to form a closed cross section having a substantially rectangular cross section extending in the front-rear direction. The side sill outer 20 and the side sill inner 30 are each formed to have a substantially hat-shaped cross section. The side sill outer 20 has flange portions 20f, 20f at the upper and lower ends, respectively, and a plurality of openings are formed in the bottom wall portion thereof for introducing and discharging the electrodeposition liquid. The flange portions 20f, 20f are joined by welding to flange portions 30f, 30f at the upper and lower ends of the side sill inner 30, respectively.

[0033] 2, 3 and 5, a center pillar outer 11 is connected to the side sill outer 20. The center pillar outer 11 is formed in a generally hat-shaped cross section, with its vehicle width direction outer wall portion joined to the outer surface of the vehicle width direction outer wall portion of the side sill outer 20 and both front and rear flange portions joined to upper flange portions 20f. The center pillar inner 12, which cooperates with the center pillar outer 11 to form a closed cross section extending vertically, is provided with an extension portion 12a that extends downward beyond the lower end portion of the center pillar outer 11.

[0034] The extension portion 12a forms a surface that is substantially perpendicular to the vehicle width direction, and spans from the upper flange portion 20f to the lower flange portion 20f. A pair of upper and lower protrusions 12x arranged in parallel are formed in the middle of the extension 12a, so that the middle of the extension 12a is formed in a corrugated shape with protrusions and recesses in the up-down direction. The extension 12a is sandwiched between the upper flange portions 20f, 30f and the lower flange portions 20f, 30f and is triple-jointed to each other, so that the extension 12a partially divides the closed cross section of the side sill 2 in the vehicle width direction in a predetermined region corresponding to the center pillar 6.

[0035] Next, the configuration of the members on the side sill outer 20 side will be described. As shown in FIGS. 2 and 3, inside the side sill outer 20, an outer front section member 21 and an outer rear section member 22 arranged rearward of the outer front section member 21 are provided. 1 and 8, the outer front section member 21 is disposed at a longitudinal position corresponding to the No. 2 cross member (not shown) that supports the front portion of the front seat, and the outer rear section member 22 is disposed at a longitudinal position corresponding to the No. 3 cross member 9 that supports the front portion of the rear seat. The outer front section member 21 and the outer rear section member 22 have the same configuration except for their installation positions.

[0036] The outer front section member 21 is formed by pressing a metal plate so as to have a generally hat-shaped cross section. As shown in Figures 2 to 4, 6 and 8, the outer front section member 21 has an outer flange portion 21a that is approximately perpendicular to the vehicle width direction, a front wall portion 21b that is connected to the rear end of the outer flange portion 21a and faces forward, a side wall portion 21c that is connected to the inner end of the front wall portion 21b and is approximately perpendicular to the vehicle width direction, a rear wall portion 21d that is connected to the rear end of the side wall portion 21c and faces rearward, and an inner flange portion 21e that is connected to the outer end of the rear wall portion 21d and is approximately perpendicular to the vehicle width direction. The flange portions 21a, 21e are joined to the inner surface of the outer wall portion of the side sill outer panel 20 in the vehicle width direction by welding.

[0037] As shown in Fig. 10, the front wall portion 21b and the rear wall portion 21d are each formed in a substantially rectangular shape, and an opening that allows communication between the front and rear is provided in the center, thereby reducing weight and improving the efficiency of draining liquid in the electrodeposition coating process S4 (see Fig. 16). A pair of upper and lower protrusions 21x arranged in parallel to each other are formed on the side wall portion 21c, so that the side wall portion 21c is formed in a corrugated shape that is uneven in the up-down direction.

[0038] Next, the configuration of the members on the side sill inner panel 30 side will be described. As shown in Figures 2 and 3, the inside of the side sill inner 30 is provided with an inner front section member 31, an inner middle section member 32 arranged rearward of the inner front section member 31, and an inner rear section member 33 arranged rearward of the inner middle section member 32. As shown in Figures 1 and 9, the inner front section member 31 is arranged at a longitudinal position corresponding to the outer front section member 21, the inner middle section member 32 is arranged at a longitudinal position corresponding to the No. 2.5 cross member 8 that supports the rear of the front seat, and the inner rear section member 33 is arranged at a longitudinal position corresponding to the outer rear section member 22.

[0039] First, the inner front section member 31 will be described. The inner front section member 31 is formed by pressing a metal plate so as to have a generally crank-shaped cross section. As shown in Figures 2 to 4, 6 and 8, the inner front section member 31 has an inner flange portion 31a whose tip extends rearward and is approximately perpendicular to the vehicle width direction, a partition wall portion 31b whose tip extends approximately perpendicular to the fore-and-aft direction, and an outer flange portion 31c whose tip extends forward and is approximately perpendicular to the vehicle width direction. The inner flange portion 31a is joined by welding to the inner surface of the inner wall portion of the side sill inner panel 30 in the vehicle width direction.

[0040] As shown in FIG. 10, the partition wall portion 31b is formed in a substantially rectangular shape, and a pair of upper and lower openings that can communicate with each other in the front and rear directions are provided. The outer flange portion 31c is formed with a pair of upper and lower recesses 31x arranged in parallel. As a result, the outer flange portion 31c is formed in a corrugated shape that is uneven in the up and down direction. As shown in FIG. 6, the front and rear dimensions of the outer flange portion 31c are set to be smaller than the front and rear dimensions of the side wall portion 21c. The front end portion of the outer flange portion 31c is offset rearward from the front end portion of the side wall portion 21c, and the rear end portion of the outer flange portion 31c is offset forward from the rear end portion of the side wall portion 21c. Here, the front end portion and the rear end portion do not only mean edge-shaped ends, but also include bent angular ends.

[0041] 4 and 10, the outer flange portion 31c is aligned so that a pair of recesses 31x and a pair of protrusions 21x engage with each other, and is adhered to the side wall portion 21c by a vibration-damping adhesive B. The vibration-damping adhesive B is a thermosetting synthetic resin material filled in the gap between the side wall portion 21c and the outer flange portion 31c. Specifically, a viscoelastic material having a storage modulus of 500 MPa or less and a loss factor of 0.2 or more under conditions of a temperature of 20° C. and a frequency of the vibration force of 30 Hz is used as the vibration-damping adhesive member B. It is more preferable that the loss factor is 0.4 and the storage modulus is 200 MPa (20° C., 30 Hz).

[0042] Next, the inner middle joint member 32 will be described. 2, 3, 5, 7, and 9, the inner middle section member 32 is configured to the same specifications as the inner front section member 31, and has an inner flange portion 32a, a partition wall portion 32b, and an outer flange portion 32c. The inner flange portion 32a is joined by welding to the inner surface of the vehicle width direction inner wall portion of the side sill inner panel 30. A pair of upper and lower recesses 32x are formed in parallel to each other in the outer flange portion 32c. As a result, the outer flange portion 32c is formed in a corrugated shape that is uneven in the vertical direction.

[0043] As shown in FIG. 7, the front-rear dimension of the outer flange portion 32c is set to be smaller than the front-rear dimension of the extension portion 12a. The front end of the outer flange portion 32c is offset rearward from the front end of the extension portion 12a, and the rear end of the outer flange portion 32c is offset forward from the rear end of the extension portion 12a. The outer flange portion 32c is bonded to the extension portion 12a by a vibration-damping adhesive B in a state where a pair of recesses 32x and a pair of protrusions 12x are aligned so as to engage with each other. Note that the front end (rear end) of the extension portion 12a refers to, in addition to the actual front end (rear end) of the extension portion 12a, when the extension portion 12a has an opening or the like in front (rear) of the front end (rear end) of the outer flange portion 32c, the edge portion of the opening is regarded as the front end (rear end) of the extension portion 12a.

[0044] The rear middle section member 33 has the same configuration as the inner front section member 31 and the inner middle section member 32, except that the tip of the inner flange portion, which is approximately perpendicular to the vehicle width direction, faces forward. The inner flange portion is joined by welding to the inner surface of the vehicle width direction inner wall portion of the side sill inner panel 30. The front-to-rear dimension of the outer flange portion is set to be smaller than the front-to-rear dimension of the side wall portion of the outer rear section member 22. The outer flange portion is adhered to the side wall portion of the outer rear section member 22 with vibration damping adhesive member B, with the pair of recesses and the pair of protrusions aligned to engage with each other.

[0045] Next, the manufacturing procedure of the vehicle body will be described with reference to the step chart of FIG. The manufacturing procedure for the vehicle body is to form a vehicle body in the form of a vehicle through the steps of assembly formation S1, adhesive member application S2, and assembly connected body formation S3, and then to perform an electrodeposition coating step S4 in which the vehicle body is electrodeposition coated. As shown in Fig. 12, the vehicle body in the form of a vehicle is an assembly connected body 40 made up of an outer assembly and an inner assembly. The outer assembly is made up of a roof assy 41 and a side frame assy 42, and the inner assembly is made up of an underbody assy 43.

[0046] 13, the assembly forming process S1 includes a roof assembling process S11 for forming a roof assembling 41 for the upper part of the vehicle body, a side frame assembling process S12 for forming a side frame assembling 42 for the side part of the vehicle body, and an underbody assembling process S13 for forming an underbody assembling 43 for the lower part of the vehicle body. Each of these forming processes S11 to S13 is assembled independently at a different station.

[0047] In the roof assembly forming process S11, a roof assembly 41 is created using the roof panel 3a and front and rear header members, etc. In the side frame assembly forming process S12, a pair of left and right side frame assemblies 42 are created using the center pillar 6 (center pillar inner 12), side sill outer 20, outer front section member 21, outer rear section member 22, etc. In the underbody assembly forming process S13, an underbody assembly 43 is formed from the floor panel 1, the side sill inner 30, the inner front section member 31, the inner middle section member 32, the inner rear section member 33, and the like.

[0048] In the adhesive applying step S2, a vibration-damping adhesive B is applied to the outer flange portions 31c to 33c of the inner joint members 31 to 33 of the underbody assembly 43, respectively. 14, the vibration-damping adhesive member B is attached to a pair of recesses 31x of the inner front section member 31 attached to the side sill inner panel 30. Similarly, the vibration-damping adhesive member B is attached to a pair of recesses of the inner middle section member 32 and the inner rear section member 33. Upon completion of assembly of the assembled assembly 40, sufficient vibration damping adhesive B is applied to connect the two surfaces assuming a maximum tolerance for the separation distance between the inner surface and the outer surface.

[0049] The outer flanges 31c and 32c correspond to the inner surface, and the side wall 21c and the extension 12a corresponding to the outer flanges 31c and 32c correspond to the outer surface. In this embodiment, the outer surface and the inner surface are disposed opposite each other in the vehicle width direction, but they may be disposed opposite each other in the vehicle width direction as long as they can be bonded using the vibration-damping adhesive member B. They are not necessarily limited to being opposed to each other in the vehicle width direction, and may be partially opposed to each other.

[0050] In the assembled body forming process S3, the prepared assemblies 41-43 are gathered in one place to assemble the assembled body 40. The roof assy 41 and a pair of side frame assemblages 42 are connected by welding, and the pair of side frame assemblages 42 and the underbody assy 43 are connected by welding. When joining the side sill outer 20 and the side sill inner 30 by welding, the convex portion 21x of the outer front section member 21 enters the concave portion 31x of the inner front section member 31 and crushes the vibration-damping adhesive member B. Similarly, the convex portion 12x of the extension portion 12a and the convex portion of the outer rear section member 22 enter the concave portions of the inner middle section member 32 and the inner rear section member 33, respectively, and crush the vibration-damping adhesive member B.

[0051] In the electro-deposition coating step S4, the assembled connected body 40 is transported and subjected to electro-deposition coating and baking drying. As shown in Figs. 15 and 16, the station for the assembled body forming step S3 and the station for the electrocoating step S4 are connected by a hanger-type transport device. The hanger-type transport device includes a guide rail 51 that connects the station of the assembled body forming process S3 to a baking and drying furnace (not shown) via an electrodeposition liquid tank 53, and a hanger 52 that is suspended from the guide rail 51 and can carry the assembled body 40, and transports the assembled body 40 at a predetermined tact time. The assembled body 40 is transported so that the front of the vehicle body faces forward in the traveling direction.

[0052] Before the connected assembly 40 arrives at the electrodeposition liquid tank 53, pre-treatments such as degreasing and cleaning to remove grease from the surface of the connected assembly 40 and chemical conversion treatment to form a chemical conversion layer on the surface are performed. In the electrodeposition liquid tank 53, an electrodeposition coating layer is formed on the surface on which the chemical conversion treatment layer has been formed. The assembled body 40 is immersed from the front of the vehicle body in a downwardly inclined manner toward the electrodeposition liquid stored in the electrodeposition liquid tank 53. The assembled body 40 is subjected to cationic electrodeposition coating while being transported through the electrodeposition liquid. Specifically, the assembled body 40 is used as a cathode and counter electrodes provided on the left and right sides and below are used as anodes, and a DC voltage is applied between the two electrodes to form an electrodeposition coating layer on the outer plate portion and the inner plate portion of the assembled body 40.

[0053] The assembled body 40 is pulled up from the front of the vehicle body in an upwardly inclined manner, and is transported to a baking and drying oven. When the assembled body 40 is pulled up from the electrodeposition liquid tank 53, the electrodeposition liquid introduced into the closed cross section of the side sill 2 flows rearward within the closed cross section and is discharged into the electrodeposition liquid tank 53 from an opening provided in the bottom wall of the side sill outer 20. The assembled body 40 transported to the baking and drying oven has the washing water remaining on its surface removed, and the electrodeposition coating layer is baked and the vibration-damping adhesive member B is thermally cured.

[0054] Next, the operation and effect of the body structure of the vehicle V will be described. According to the vehicle body structure of Example 1, since the vibration damping adhesive member B is provided which bonds between the side wall portion 21c (extension portion 12a) which is the outer surface portion and the outer flange portion 31c (32c) which is the inner surface portion and is capable of damping vibration, the strain energy converted based on the torsional displacement of the side sill outer 20 and the side sill inner 30 is temporarily stored inside the vibration damping adhesive member B as shear strain, and a portion of the stored strain energy is dissipated as thermal energy, thereby damping vibration. Since one end of the side wall portion 21c and one end of the outer flange portion 31c in the longitudinal direction of the side sill 2 are formed to be offset by a predetermined distance in the fore-and-aft direction, even if a sufficient amount of vibration-damping material B is applied assuming the maximum tolerance in the vehicle state, as shown in Figure 17, an adhesive portion T to which the overflow portion Ba of the vibration-damping adhesive material B overflowing from the connecting portion between the outer flange portion 31c and the side wall portion 21c, i.e., the opposing area, can be adhered can be secured in the outer front section member 21 (center pillar inner 12), which is the outer member, and peeling of the overflow portion Ba can be prevented.

[0055] The side wall portion 21c (extension portion 12a) and the outer flange portion 31c (32c) are each formed in a wavy shape with projections and recesses in the vehicle width direction, and are bonded in a state in which multiple recesses 31x (32x) on one surface portion are engaged with multiple protrusions 21x (12x) on the other surface portion, thereby improving vibration damping while ensuring a sufficient bonding area.

[0056] Since the vibration-damping adhesive B applied to the multiple recesses 31x (32x) on one surface bonds between the side wall portion 21c (extension portion 12a) and the outer flange portion 31c (32c), dripping of the applied vibration-damping adhesive B can be prevented even if the product is left for a long time.

[0057] Since the front end of the outer flange portion 31c (32c) is positioned closer to the rear end than the front end of the side wall portion 21c (extension portion 12a), an adhesive portion to which the overflow portion Ba of the vibration damping adhesive material B can be adhered can be formed using one of the side wall portions 21c (extension portion 12a).

[0058] Since the one side end is the front end in the longitudinal direction of the vehicle body, peeling of the overflow portion Ba at the front end, which has a high tendency to peel off, can be suppressed in the electrodeposition coating step S4.

[0059] Since the framework member is the side sill 2, the vibration damping adhesive member B can be disposed in the side sill 2 which has a large torsional displacement, thereby increasing the vibration damping effect. Also, the side sill 2 can be configured separately into a side frame assembly 42 and an underbody assembly 43.

[0060] The outer side member is the center pillar inner 12 of the center pillar 6 extending upward from the side sill 2, or the joint members 21, 22 that divide the closed cross section into front and rear, and the inner side member is the inner middle joint member 32 that divides the closed cross section into front and rear, or the joint members 31, 33, so vibration damping can be achieved using the existing joint members 21, 22, 31-33.

[0061] According to this vehicle body manufacturing method, it includes a side frame assy forming process S12 for forming a side frame assy 42 by fixing an outer front section member 21 and a center pillar inner 12 (outer side member) to the side sill outer 20, and an underbody assy forming process S13 for forming an underbody assy 43 by fixing an inner front section member 31 and an inner middle section member 32 (inner side member) to the side sill inner 30, so that the side frame assy 42 and the underbody assy 43 can be produced independently. When the separation distance between the side wall portion 21c (extension portion 12a) and the outer flange portion 31c (32c) in the vehicle state is at the maximum tolerance, the method includes an adhesive application process S2 in which a vibration-damping adhesive material B of a vehicle width direction height capable of bonding the side wall portion 21c and the outer flange portion 31c is applied to at least one of the side wall portion 21c and the outer flange portion 31c, and therefore even if the separation distance between the side wall portion 21c and the outer flange portion 31c is at the maximum tolerance, the side wall portion 21c and the outer flange portion 31c can be bonded, and vibration damping can be achieved. Since the method includes a connected assembly forming step S3 in which the vibration-damping adhesive member B is interposed between the side wall portion 21c and the outer flange portion 31c, and the side frame assy 42 and the underbody assy 43 are connected to form the connected assembly 40 so that one end of the side wall portion 21c in the longitudinal direction of the side sill 2 and one end of the outer flange portion 31c are offset by a predetermined distance in the vehicle front-rear direction, it is possible to form an adhesive portion T to which the overflow portion Ba of the vibration-damping adhesive member B can be adhered using one of the surfaces. Since the method includes an electrodeposition coating step S4 in which the connected assembly 40 is immersed in an electrodeposition liquid tank so that the electrodeposition liquid flows in the vehicle front-rear direction within the closed cross section of the connected assembly 40, it is possible to perform electrodeposition coating while preventing the overflow portion Ba of the vibration-damping adhesive member B from peeling off.

[0062] The side wall portion 21c (extension portion 12a) which is the outer surface portion, and the outer flange portion 31c (32c) which is the inner surface portion are each formed in advance into a wavy shape that is uneven in the vehicle width direction, and the adhesive material application process S2 applies a vibration-damping adhesive material B to multiple recesses 31x (32x) on one surface portion of the side wall portion 21c and the outer flange portion 31c, and the assembly connection body formation process S3 forms the assembly connection body 40 so that the recesses 31x (32x) on one surface portion engage with the protrusions 21x (12x) on the other surface portion. This prevents the applied vibration-damping adhesive material B from dripping, thereby improving adhesion and vibration damping properties.

[0063] One side end is the front end in the fore-and-aft direction of the vehicle body, and in the assembly body forming process S3, the front end in the fore-and-aft direction of one surface portion is positioned closer to the rear end than the front end in the fore-and-aft direction of the other surface portion, and in the electrocoating process S4, the assembly body 40 is immersed from the front side in the fore-and-aft direction of the vehicle body, so that peeling of the overflow portion Ba of the front end portion, which has a high tendency to peel off, can be suppressed in the electrocoating process S4.

[0064] The outer member is the center pillar inner 12 extending upward from the side sill 2, or the joint members 21, 22 that divide the closed cross section into front and rear, and the inner member is the inner middle joint member 32 that divides the closed cross section into front and rear, or the joint members 31, 33, so vibration damping can be achieved using the existing joint members 21, 22, 31-33.

[0065] Next, a modified example in which the above embodiment is partially changed will be described. 1) In the above embodiment, the side sill 2 was used as an example of a framework member, but the present invention can also be applied to roof side rails 3, pillar members, etc. as long as the framework member has at least a closed cross section through which the electrochemical deposition liquid can flow.

[0066] 2) In the above embodiment, the vibration-damping adhesive B is applied to the recess 31x (32x) of the outer flange portion 31c (32c) which is the inner surface portion, but the vibration-damping adhesive B may be applied to the side wall portion 21c (extension portion 12a) which is the outer surface portion. Also, the example of a pair of upper and lower recesses 31x (32x) has been described, but the number of recesses may be one or three or more.

[0067] 3) In the above embodiment, an example was described in which the center pillar inner 12 and the extension portion 12a were formed integrally, but the center pillar inner portion and the partition portion (extension portion 12a) that divides the side sill in the vehicle width direction may also be formed as separate members.

[0068] 4) In addition, a person skilled in the art can implement the present invention in various ways by adding various modifications to the above-mentioned embodiments or by combining the various embodiments without departing from the spirit of the present invention, and the present invention also includes such modifications. [Explanation of symbols]

[0069] 2 Side sill 6 Center Pillar 12 Center pillar inner 12a Extension 12x protrusion 20 Side sill outer 21 Lateral anterior segment member 21c Side wall part 21x protrusion 30 Side sill inner 31 Inner front section member 31c Outer flange 31x recess 32 Inner middle section member 32c Outer flange 32x recess 40 Assembly connection body 42 Side frame assembly 43 Andabodiassi V Vehicle S2 Adhesive material application process S3 Assembly connection body formation process S4 Electrodeposition painting process S12 Side frame assembly forming process S13 Underbody assembly forming process

Claims

1. A vehicle body structure for a vehicle including an outer member constituting an outer portion in the vehicle width direction of a framework member extending in the fore-and-aft direction of the vehicle body, an inner member constituting an inner portion in the vehicle width direction of the framework member and forming a closed cross section extending in the fore-and-aft direction of the vehicle body in cooperation with the outer member, an outer side member fixed to an inner side in the vehicle width direction of the outer member and having an outer surface portion substantially perpendicular to the vehicle width direction, and an inner side member fixed to an outer side in the vehicle width direction of the inner member and having an inner surface portion substantially perpendicular to the vehicle width direction and facing the outer surface portion, a vibration damping adhesive member that bonds the outer surface portion and the inner surface portion and is capable of damping vibration; the inner surface portion is set to be smaller in a front-rear dimension than the outer surface portion in a vehicle body front-rear direction of the framework member, a front end portion of the inner surface portion is offset rearward by a predetermined distance from a front end portion of the outer surface portion, A vehicle body structure, comprising: a rear end portion of the inner surface portion formed to be offset a predetermined distance forward from a rear end portion of the outer surface portion.

2. 2. The vehicle body structure of claim 1, wherein the outer surface portion and the inner surface portion are arranged parallel to one another and are each formed in a corrugated shape with projections and recesses in the vehicle width direction, and are bonded together in a state in which a plurality of recesses on one surface portion are engaged with a plurality of protrusions on the other surface portion.

3. 3. The vehicle body structure according to claim 2, wherein the vibration-damping adhesive material applied to the plurality of recesses of the one surface portion bonds the outer surface portion and the inner surface portion together.

4. A vehicle body structure as described in any one of claims 1 to 3, characterized in that the skeletal member is a side sill.

5. The outer side member is an inner panel of a pillar member extending upwardly from the side sill, or a joint member dividing the closed cross section into front and rear, and the inner side member is a joint member dividing the closed cross section into front and rear, characterized in that the vehicle body structure of the vehicle described in claim 4.

6. A method for manufacturing a vehicle body comprising an outer member constituting an outer portion in the vehicle width direction of a skeletal member extending in the fore-and-aft direction of the vehicle body, an inner member constituting an inner portion in the vehicle width direction of the skeletal member and cooperating with the outer member to form a closed cross section extending in the fore-and-aft direction of the vehicle body, an outer side member fixed to the inner side in the vehicle width direction of the outer member and having an outer surface portion approximately perpendicular to the vehicle width direction, and an inner side member fixed to the outer side in the vehicle width direction of the inner member and having an inner surface portion approximately perpendicular to the vehicle width direction and facing the outer surface portion, an outer assembly process for forming an outer assembly in which the outer side member is fixed to the outer member; an inner assembly process for forming an inner assembly in which the inner side member is fixed to the inner member; an adhesive member application process for applying a vibration-damping adhesive member to at least one of the outer surface portion and the inner surface portion, the vibration-damping adhesive member having a vehicle width direction height capable of adhering the outer surface portion and the inner surface portion when a separation distance between the outer surface portion and the inner surface portion in a vehicle state is a maximum tolerance; a coupled assembly forming step of connecting the outer assembly and the inner assembly to form a coupled assembly by interposing the vibration-damping adhesive member between the outer surface portion and the inner surface portion and such that one end portion of the outer surface portion and one end portion of the inner surface portion in the longitudinal direction of the frame member are offset by a predetermined distance in the front-rear direction of the vehicle body; an electrodeposition coating process of immersing the assembled body in an electrodeposition liquid tank so that the electrodeposition liquid flows in the front-rear direction of the vehicle body within the closed cross section of the assembled body; A method for manufacturing a vehicle body, comprising:

7. The outer surface portion and the inner surface portion are each formed in advance into a corrugated shape that is uneven in the vehicle width direction, The adhesive applying step applies the vibration-damping adhesive to a plurality of recesses in one of the outer surface portion and the inner surface portion, 7. The vehicle body manufacturing method according to claim 6, wherein the assembly connected body forming step forms the assembly connected body such that a recess on one surface portion engages with a protrusion on the other surface portion.

8. The one side end portion is a front end portion in the fore-and-aft direction of the vehicle body, The assembly connected body forming step includes disposing a front end portion of the one surface portion in a vehicle front-rear direction toward a rear end portion relative to a front end portion of the other surface portion in a vehicle front-rear direction, 8. The vehicle body manufacturing method according to claim 7, wherein the electrodeposition coating step comprises immersing the assembled body from a front side in the vehicle front-rear direction.

9. The framework member is a side sill, The vehicle body manufacturing method according to any one of claims 6 to 8, characterized in that the outer side member is an inner panel of a pillar member extending upward from the side sill, or a joint member that divides the closed cross section into front and rear parts, and the inner side member is a joint member that divides the closed cross section into front and rear parts.

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