Door frame structure

Abstract

To provide a door frame structure capable of restraining reduction in rigidity of a door frame body of a vehicle.SOLUTION: The door frame structure 11 includes a hollow structural body constituting a door frame body of a vehicle and a reinforcing structure 13. A first panel P1 of a hollow structural body has a first corner panel part P13 composed of one first plate material 21. The first plate member 21 includes a first vertical connecting portion 25 between the first corner portion 22 and the first vertical panel welding portion 23, and a first horizontal connecting portion 26 between the first corner portion 22 and the first horizontal panel welding portion 24. The reinforcing structure 13 comprises a reinforcing member 51 having a polymeric material layer 52. The polymer material layer 52 is bonded to the first plate material 21 and the second panel facing the first panel P1 in the vehicle inside-outside direction. The polymer material layer 52 is bonded to any one of the first vertical connecting portion 25 and the first horizontal connecting portion 26, and is disposed to be separated from the first vertical panel welding portion 23 and the first horizontal panel welding portion 24.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a door frame structure. [Background technology]

[0002] A door frame structure to which a vehicle door, such as a vehicle back door, is attached is known, as described in Patent Document 1. The door frame body of the door frame structure is composed of a hollow structure formed by welding multiple panels together. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-103738 Summary of the Invention [Problem to be solved by the invention]

[0004] In a door frame structure having a vehicle door frame body as described above, the rigidity of the door frame body may be reduced due to the positional relationship between the welded portion and the corner portion of the hollow structure that constitutes the door frame body.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a door frame structure that makes it possible to suppress a decrease in the rigidity of the vehicle door frame body. [Means for solving the problem]

[0006] Various aspects of the door frame structure that solve the above problems will be described. The door frame structure of aspect 1 comprises a hollow structure constituting a door frame main body of a vehicle, and a reinforcing structure reinforcing the hollow structure, wherein the hollow structure is a door frame structure having a first panel and a second panel arranged facing each other in the inside-outside direction of the vehicle, and a hollow portion between the first panel and the second panel, wherein the first panel has first upper and lower panel portions extending in the up-down direction of the vehicle, and first left and right panel portions extending in the width direction or the front-rear direction of the vehicle, and a first corner panel portion located between the first upper and lower panel portions and the first left and right panel portions, the first corner panel portion being made up of a single first plate material, the first plate material having a first corner portion, a first upper and lower panel weld portion welded to the first upper and lower panel portions, a first left and right panel weld portion welded to the first left and right panel portions, a first upper and lower connecting portion between the first corner portion and the first upper and lower panel weld portion, and a first left and right connecting portion between the first corner portion and the first left and right panel weld portion, the reinforcing structure comprising a reinforcing member having a polymer material layer adhered to the first plate material and the second panel, the polymer material layer being adhered to the connecting portion of either the first upper and lower connecting portion or the first left and right connecting portion, and being positioned at a distance from the first upper and lower panel weld portion and the first left and right panel weld portion.

[0007] According to this configuration, by bonding the polymer material layer of the reinforcing member as described above, it is possible to distribute the load applied to either the first vertical connecting portion or the first horizontal connecting portion of the first plate material.

[0008] In the door frame structure of aspect 2, in aspect 1, the reinforcing member may comprise a first reinforcing member and a second reinforcing member arranged at a distance from the first reinforcing member, the first reinforcing member having a first polymeric material layer adhered to the first upper and lower connecting portions, and the second reinforcing member having a second polymeric material layer adhered to the first left and right connecting portions.

[0009] According to this configuration, by bonding the first polymer material layer of the first reinforcing member and the second polymer material layer of the second reinforcing member as described above, it becomes possible to distribute the load applied to the first vertical connecting portion and the first horizontal connecting portion of the first plate material.

[0010] In the door frame structure of aspect 3, in aspect 2, the distance between the first reinforcing member and the second reinforcing member may be greater than the distance between the first reinforcing member and the first upper and lower panel welds, and may also be greater than the distance between the second reinforcing member and the first left and right panel welds.

[0011] According to this configuration, the first reinforcing member and the second reinforcing member arranged as described above make it possible to distribute the load applied to the first vertical connecting portion and the first horizontal connecting portion of the first plate material in a balanced manner.

[0012] In the door frame structure of Aspect 4, in Aspect 2 or Aspect 3, at least one of the first polymeric material layer of the first reinforcing member and the second polymeric material layer of the second reinforcing member may be a foam layer. This configuration allows the foam layer to exhibit load distribution performance.

[0013] In the door frame structure of aspect 5, in aspect 4, at least one of the first reinforcing member and the second reinforcing member has the foam layer and a support member that supports the foam layer, and the support member has a first surface facing the first corner panel portion and a second surface facing the second panel, and the foam layer may be sandwiched between the first corner panel portion and the first surface and between the second panel and the second surface.

[0014] According to this configuration, since the reinforcing member includes the support member, it is possible to increase the rigidity of the reinforcing member itself, thereby further improving the load distribution performance of the reinforcing member.

[0015] In the door frame structure of aspect 6, in any one of aspects 1 to 5, the reinforcing structure may be provided corresponding to at least one of two corners located at both ends of the upper part of the door frame body. According to this configuration, by providing a reinforcing member corresponding to the corner at the upper part of the door frame body, it is possible to efficiently suppress a decrease in the overall rigidity of the door frame body.

[0016] In the door frame structure of aspect 7, in any one of aspects 1 to 6, the second panel has second upper and lower panel portions extending in the vertical direction of the vehicle, second left and right panel portions extending in the width direction or the front-to-rear direction of the vehicle, and a second corner panel portion located between the second upper and lower panel portions and the second left and right panel portions, and the second corner panel portion is made of a single second plate material, and the second plate material has a second corner portion, second upper and lower panel welds welded to the second upper and lower panel portions, second left and right panel welds welded to the second left and right panel portions, a second upper and lower connecting portion between the second corner portion and the second upper and lower panel welds, and a second left and right connecting portion between the second corner portion and the second left and right panel welds, and the polymer material layer of the reinforcing member may be adhered to the connecting portion of the second upper and lower connecting portion and the second left and right connecting portion of the second plate material that faces the connecting portion adhered in the first plate material, and may be positioned at a distance from the second upper and lower panel welds and the second left and right panel welds.

[0017] According to this configuration, by bonding the polymer material layer of the reinforcing member as described above, it becomes possible to distribute the load applied to either the second vertical connecting portion or the second horizontal connecting portion of the second plate material. [Effects of the Invention]

[0018] The present invention exhibits the effect of making it possible to suppress a decrease in the rigidity of a vehicle door frame body. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view showing a door frame structure according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view showing a main part of the door frame structure. [Figure 3] FIG. 3 is a cross-sectional view showing a main part of the door frame structure. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of a door frame structure will be described with reference to the drawings. As shown in FIG. 1 , a door frame structure 11 includes a hollow structure constituting a vehicle door frame main body 12 and a reinforcing structure 13 reinforcing the hollow structure. The door frame main body 12 has an opening 12a to which a vehicle door is attached. Examples of vehicle doors include a vehicle back door and a side door (front door, rear door, etc.). Types of doors include a swing door and a sliding door. In this embodiment, a door frame structure 11 for a vehicle back door will be described as an example. The +X and −X directions in the drawings indicate the right and left directions, respectively, when viewing the door frame structure 11 from the front of the vehicle. The +Y and −Y directions in the drawings indicate the front and rear directions, respectively, of the vehicle. In this embodiment, the +Y direction indicates the inside of the vehicle, and the −Y direction indicates the outside of the vehicle. The +Z and −Z directions in the drawings indicate the upward and downward directions of the vehicle, respectively. For ease of explanation, the drawings may exaggerate or simplify some of the components.

[0021] <Door frame body 12> As shown in Figures 1 and 4, the hollow structure constituting the door frame main body 12 has a first panel P1 and a second panel P2 arranged facing each other in the inside-outside direction of the vehicle, and a hollow portion H1 between the first panel P1 and the second panel P2.

[0022] The first panel P1 of this embodiment is disposed on the vehicle exterior side relative to the second panel P2. More specifically, the first panel P1 and the second panel P2 are disposed along the front-to-rear direction of the vehicle. The first panel P1 is disposed rearward of the vehicle relative to the second panel P2. The first panel P1 of this embodiment is a reinforcement panel. The second panel P2 is, for example, an inner panel.

[0023] The door frame body 12 includes an outer panel (not shown) located on the vehicle exterior side (rear side) of the first panel P1. The door frame body 12 may also include a panel located on the vehicle interior side (front side) of the second panel P2. The first panel P1 and the second panel P2 are joined by welding, for example, spot welding.

[0024] 2, the first panel P1 has a first vertical panel portion P11 extending in the vertical direction of the vehicle and a first left / right panel portion P12 extending in the width direction of the vehicle (the left / right direction when viewed from the front of the vehicle). The first panel P1 has a first corner panel portion P13 located between the first vertical panel portion P11 and the first left / right panel portion P12.

[0025] More specifically, the frame-shaped first panel P1 has two first upper and lower panel portions P11 spaced apart in the left-right direction and two first left and right panel portions P12 spaced apart in the up-down direction. The first panel P1 has four first corner panel portions P13 connecting both ends of the two first upper and lower panel portions P11 and both ends of the two first left and right panel portions P12.

[0026] Of the four first corner panel portions P13, the two first corner panel portions P13 that form the upper portion of the door frame body 12 are each made up of a single first plate member 21. The first plate member 21 is arranged by welding to the first upper and lower panel portions P11 and the first left and right panel portions P12.

[0027] The first plate 21 has a first corner 22, a first vertical panel weld 23 welded to the first vertical panel portion P11, and a first left-right panel weld 24 welded to the first left-right panel portion P12. The first corner 22 refers to a cross-sectional portion passing through the portion of the outer edge of the first corner panel portion P13 with the greatest curvature, and in Figures 2 and 3, refers to the portion between two dashed dotted lines extending from the outer edge of the first corner panel portion P13. The first vertical panel weld 23 and the first left-right panel weld 24 can be formed by welding both ends of the first plate 21 to the first vertical panel portion P11 and the first left-right panel portion P12, respectively, while they are overlapped. Examples of welding include spot welding. The first plate material 21 has a first upper and lower connecting portion 25 between the first corner portion 22 and the first upper and lower panel weld portion 23, and a first left and right connecting portion 26 between the first corner portion 22 and the first left and right panel weld portion 24.

[0028] 3, the second panel P2 has a second vertical panel portion P21 extending in the vertical direction of the vehicle and a second left / right panel portion P22 extending in the width direction of the vehicle (the left / right direction when viewed from the front of the vehicle). The second panel P2 has a second corner panel portion P23 located between the second vertical panel portion P21 and the second left / right panel portion P22.

[0029] More specifically, the frame-shaped second panel P2 has two second upper and lower panel portions P21 spaced apart in the left-right direction and two second left and right panel portions P22 spaced apart in the up-down direction. The second panel P2 has four second corner panel portions P23 connecting both ends of the two second upper and lower panel portions P21 and both ends of the two second left and right panel portions P22.

[0030] Of the four second corner panel portions P23, two second corner panel portions P23 that form the upper portion of the door frame body 12 are each composed of a single second plate member 31. The second plate member 31 has a second corner portion 32, a second upper / lower panel weld portion 33 welded to the second upper / lower panel portion P21, and a second left / right panel weld portion 34 welded to the second left / right panel portion P22. The second corner portion 32 refers to a cross-sectional portion passing through the portion of the outer edge of the second corner panel portion P23 with the greatest curvature. The second upper / lower panel weld portion 33 and the second left / right panel weld portion 34 can be formed by welding both ends of the second plate member 31 to the second upper / lower panel portion P21 and the second left / right panel portion P22, respectively, while overlapping them. Examples of welding include spot welding. The second plate material 31 has a second upper and lower connecting portion 35 between the second corner portion 32 and the second upper and lower panel weld portion 33, and a second left and right connecting portion 36 between the second corner portion 32 and the second left and right panel weld portion 34.

[0031] The first corner 22 of the first plate member 21 and the second corner 32 of the second plate member 31 are arranged facing each other in the interior / exterior direction of the vehicle. The first vertical connecting portion 25 of the first plate member 21 and the second vertical connecting portion 35 of the second plate member 31 are arranged facing each other in the interior / exterior direction of the vehicle. The first left / right connecting portion 26 of the first plate member 21 and the second left / right connecting portion 36 of the second plate member 31 are arranged facing each other in the interior / exterior direction of the vehicle.

[0032] <Reinforcement structure 13> As shown in Fig. 1, the reinforcing structures 13 are provided corresponding to the corners located at both ends of the upper part of the door frame main body 12. The reinforcing structure 13 includes a first reinforcing structure 13a provided corresponding to the upper right corner and a second reinforcing structure 13b provided corresponding to the upper left corner. The first reinforcing structure 13a and the second reinforcing structure 13b are configured to be symmetrical, so below, the first reinforcing structure 13a will be described with reference to Figs. 2 to 4, and a description of the second reinforcing structure 13b will be omitted.

[0033] The first reinforcing structure 13a includes a reinforcing member 51. The reinforcing member 51 has a polymer material layer 52 bonded to the first plate member 21 and the second plate member 31. The reinforcing member 51 has a support member 53 that supports the polymer material layer 52.

[0034] The reinforcing member 51 includes a first reinforcing member 51a and a second reinforcing member 51b. The first reinforcing member 51a includes a first polymeric material layer 52a and a first support member 53a that supports the first polymeric material layer 52a. The first polymeric material layer 52a is bonded to the first vertical connector 25 of the first plate member 21. The first polymeric material layer 52a is also bonded to the second vertical connector 35 of the second plate member 31 that faces the first vertical connector 25.

[0035] The first support member 53a has a first surface S1 facing the first corner panel portion P13 and a second surface S2 facing the second corner panel portion P23. The first polymeric material layer 52a is sandwiched between the first corner panel portion P13 and the first surface S1 of the first support member 53a, and between the second corner panel portion P23 and the second surface S2 of the first support member 53a.

[0036] The second reinforcing member 51b includes a second polymeric material layer 52b and a second support member 53b that supports the second polymeric material layer 52b. The second polymeric material layer 52b is adhered to the first left-right connecting portion 26 of the first plate member 21. The second polymeric material layer 52b is also adhered to the second left-right connecting portion 36 of the second plate member 31 that faces the first left-right connecting portion 26.

[0037] The second support member 53b has a first surface S1 facing the first corner panel portion P13 and a second surface S2 facing the second corner panel portion P23. The second polymeric material layer 52b is sandwiched between the first corner panel portion P13 and the first surface S1 of the second support member 53b, and between the second corner panel portion P23 and the second surface S2 of the second support member 53b.

[0038] Examples of polymeric materials for the polymeric material layer 52 include thermosetting resins, thermoplastic resins, elastomers, and rubbers. Examples of thermosetting resins include epoxy resins, phenolic resins, and urethane resins. Examples of thermoplastic resins include polyolefins, acrylic resins, styrene resins, and EVA (ethylene / vinyl acetate copolymers). Examples of elastomers include RB (polybutadiene elastomer), SBS (styrene / butadiene / styrene block copolymer), SIS (styrene / isoprene / styrene block copolymer), and SEBS (styrene / ethylene / butylene / styrene block copolymer). Examples of rubbers include NR (natural rubber), SBR (styrene / butadiene rubber), BR (butadiene rubber), NBR (nitrile rubber), CR (chloroprene rubber), IR (isoprene rubber), IIR (butyl rubber), EPDM (ethylene propylene diene terpolymer), UR (urethane rubber), ENR (epoxidized natural rubber), and EPM (ethylene / propylene rubber).

[0039] The polymer material layer 52 may have a single-layer structure or a multi-layer structure of two or more layers, for example, including a non-adhesive layer and an adhesive layer. At least one of the first polymer material layer 52a and the second polymer material layer 52b is preferably a foam layer. The foam layer can be obtained by heating a foam material.

[0040] The foamable member is obtained by molding a foamable material using a known molding method such as extrusion molding, press molding, or injection molding. The foamable material contains, for example, a polymer material, a foaming agent, a crosslinking agent, etc. The foamable material may contain a filler, a plasticizer, etc. as needed. Examples of foaming agents include azodicarbonamide and dinitropentamethylenetetramine, examples of crosslinking agents include well-known dimethylurea and dicyandiamide, and examples of fillers include calcium carbonate, barium sulfate, ferrite, and silica. Such a foamable member hardens when heated, thereby adhering to the first plate member 21 and the second plate member 31.

[0041] Examples of materials for the support member 53 include resin materials such as polyamide, and metal materials such as steel. In this embodiment, a support member 53 made of a resin material is used. The support member 53 has a fixing portion (not shown). The fixing portion of the support member 53 can be configured to engage with, for example, a mounting hole formed through the first panel P1.

[0042] 2, the distance L1 between the first reinforcing member 51a and the second reinforcing member 51b is greater than the distance L1a between the first reinforcing member 51a and the first upper / lower panel weld 23. The distance L1 between the first reinforcing member 51a and the second reinforcing member 51b is greater than the distance L1b between the second reinforcing member 51b and the first left / right panel weld 24.

[0043] The distance L1 is the shortest distance between the first reinforcing member 51a and the second reinforcing member 51b. The distance L1a is the shortest distance between the first reinforcing member 51a and the first upper / lower panel weld 23. The distance L1b is the shortest distance between the second reinforcing member 51b and the first left / right panel weld 24.

[0044] 3, the distance L1 between the first reinforcing member 51a and the second reinforcing member 51b is greater than the distance L2a between the first reinforcing member 51a and the second upper / lower panel weld 33. The distance L1 between the first reinforcing member 51a and the second reinforcing member 51b is greater than the distance L2b between the second reinforcing member 51b and the second left / right panel weld 34.

[0045] The distance L2a is the shortest distance between the first reinforcing member 51a and the second upper / lower panel weld 33. The distance L1b is the shortest distance between the second reinforcing member 51b and the second left / right panel weld .

[0046] <Method for forming door frame structure 11> Next, a method for forming the door frame structure 11 will be described. The door frame structure 11 can be formed by providing the above-described reinforcing structure 13 to the hollow structure of the door frame main body 12. For example, if the polymer material layer 52 of the reinforcing member 51 in the reinforcing structure 13 is a foam layer, the foam material placed in the hollow portion H1 of the hollow structure is heated from the outside to foam and harden the foam material. This allows the above-described foam layer to be formed. The foam material can be heated, for example, using the drying process when painting (electrodeposition coating) the door frame main body 12. Note that the foam material may also be heated using a well-known heating device that uses a heat source such as electricity or steam.

[0047] <Actions and Effects of This Embodiment> Next, the operation and effects of this embodiment will be described. (1) The door frame structure 11 includes a reinforcing structure 13 that reinforces a hollow structure constituting a vehicle door frame main body 12. The first panel P1 of the hollow structure has a first corner panel portion P13 formed from a single first plate member 21. The first plate member 21 has a first corner portion 22, a first upper / lower panel weld portion 23 welded to the first upper / lower panel portion P11, and a first left / right panel weld portion 24 welded to the first left / right panel portion P12. The first plate member 21 has a first upper / lower connecting portion 25 between the first corner portion 22 and the first upper / lower panel weld portion 23, and a first left / right connecting portion 26 between the first corner portion 22 and the first left / right panel weld portion 24. The reinforcing structure 13 includes a reinforcing member 51 having a polymer material layer 52 bonded to the first plate member 21 and the second panel P2. The polymer material layer 52 is adhered to either the first upper / lower connecting portion 25 or the first left / right connecting portion 26 of the first plate material 21, and is positioned at a distance from the first upper / lower panel welding portion 23 and the first left / right panel welding portion 24.

[0048] According to this configuration, by bonding the polymer material layer 52 of the reinforcing member 51 as described above, it is possible to distribute the load applied to either the first vertical connecting portion 25 or the first horizontal connecting portion 26 of the first plate member 21. Therefore, it is possible to suppress a decrease in the rigidity of the door frame main body 12 of the vehicle.

[0049] (2) The reinforcing member 51 includes a first reinforcing member 51a and a second reinforcing member 51b spaced apart from the first reinforcing member 51a. The first reinforcing member 51a includes a first polymeric material layer 52a bonded to the first vertical connecting portion 25. The second reinforcing member 51b includes a second polymeric material layer 52b bonded to the first horizontal connecting portion 26.

[0050] In this case, by bonding the first polymeric material layer 52a of the first reinforcing member 51a and the second polymeric material layer 52b of the second reinforcing member 51b together as described above, it becomes possible to distribute the load applied to the first vertical connecting portion 25 and the first horizontal connecting portion 26 of the first plate member 21. Therefore, it becomes possible to further suppress a decrease in the rigidity of the vehicle door frame main body 12.

[0051] (3) The distance L1 between the first reinforcing member 51a and the second reinforcing member 51b is greater than the distance L1a between the first reinforcing member 51a and the first upper and lower panel welds 23, and is greater than the distance L1b between the second reinforcing member 51b and the first left and right panel welds 24.

[0052] In this case, the first reinforcing member 51a and the second reinforcing member 51b arranged as described above make it possible to distribute the load applied to the first vertical connecting portion 25 and the first left-right connecting portion 26 of the first plate material 21 in a balanced manner.

[0053] (4) At least one of the polymer material layers 52, the first polymer material layer 52a of the first reinforcing member 51a and the second polymer material layer 52b of the second reinforcing member 51b, is preferably a foam layer. In this case, the foam layer can exert its load distribution performance.

[0054] (5) The first reinforcing member 51a has a foam layer and a first support member 53a that supports the foam layer. The first support member 53a has a first surface S1 that faces the first corner panel portion P13 and a second surface S2 that faces the second panel P2. The foam layer of the first reinforcing member 51a is sandwiched between the first corner panel portion P13 and the first surface S1 and between the second panel P2 and the second surface S2. In this case, the first reinforcing member 51a includes the first support member 53a, which increases the rigidity of the first reinforcing member 51a itself. This further improves the load distribution performance of the first reinforcing member 51a.

[0055] Similarly to the first reinforcing member 51a, the second reinforcing member 51b also has a foam layer and a second support member 53b that supports the foam layer, and therefore exerts the same effects as the first reinforcing member 51a.

[0056] (6) The reinforcing structure 13 is provided corresponding to at least one of the two corners located at both ends of the upper part of the door frame main body 12. In this case, by providing the reinforcing member 51 corresponding to the corner at the upper part of the door frame main body 12, it is possible to efficiently suppress a decrease in the overall rigidity of the vehicle door frame main body 12.

[0057] (7) The second corner panel portion P23 of the second panel P2 is composed of a single second plate member 31. The polymer material layer 52 of the reinforcing member 51 is bonded to the second vertical connecting portions 35 and second horizontal connecting portions 36 of the second plate member 31 that face the connecting portions bonded in the first plate member 21. The polymer material layer 52 of the reinforcing member 51 is disposed at a distance from the second vertical panel welded portions 33 and the second horizontal panel welded portions 34.

[0058] In this case, by bonding the polymer material layer 52 of the reinforcing member 51 as described above, it is possible to distribute the load applied to either the second vertical connecting portion 35 or the second horizontal connecting portion 36 of the second plate member 31. Therefore, it is possible to suppress a decrease in the rigidity of the door frame main body 12 of a vehicle having the second corner panel portion P23 as described above.

[0059] <Example of change> The above embodiment may be modified as follows: The above embodiment and the following modifications may be combined with each other within the scope of technical compatibility.

[0060] The polymer material layer 52 of the reinforcing member 51 is disposed apart from the second upper / lower panel welds 33 and the second left / right panel welds 34 of the second plate 31, but is not limited to this arrangement. The first polymer material layer 52a of the first reinforcing member 51a may be bonded to the second upper / lower panel welds 33 of the second plate 31, for example. The second polymer material layer 52b of the second reinforcing member 51b may be bonded to the second left / right panel welds 34 of the second plate 31, for example.

[0061] The polymer material layer 52 of the reinforcing member 51 is bonded to one of the second vertical connecting portions 35 and the second horizontal connecting portions 36 of the second plate member 31, but is not limited to this bonding structure. The first polymer material layer 52a of the first reinforcing member 51a may be bonded to, for example, the second corner portion 32. The first polymer material layer 52a may also be bonded to, for example, the second vertical panel portion P21 without being bonded to the second plate member 31. The second polymer material layer 52b of the second reinforcing member 51b may be bonded to, for example, the second corner portion 32. The second polymer material layer 52b may also be bonded to, for example, the second horizontal panel portion P22 without being bonded to the second plate member 31.

[0062] The second corner panel portion P23 of the second panel P2 is made up of a single second plate material 31, but the second corner panel portion P23 can also be made up of multiple plate materials welded together.

[0063] The second panel P2 may be entirely made of a single plate material, or may be entirely made of three or more panels. In the first reinforcing structure 13a, either the first reinforcing member 51a or the second reinforcing member 51b may be omitted.

[0064] In the second reinforcing structure 13b, either the first reinforcing member 51a or the second reinforcing member 51b may be omitted. The reinforcing structure 13 can be provided corresponding to at least one of the four corners consisting of two corners located at both ends of the upper part of the door frame main body 12 and two corners located at both ends of the lower part of the door frame main body 12. For example, either the first reinforcing structure 13a or the second reinforcing structure 13b may be omitted. Furthermore, for example, a reinforcing structure can be provided corresponding to a corner located at the right end of the upper part of the door frame main body 12 and a corner located at the left end of the lower part of the door frame main body 12. Even in this case, the reinforcing structure 13 can prevent a decrease in the rigidity of the door frame main body 12.

[0065] Of the four corners consisting of the two corners located at both ends of the upper part of the door frame body 12 and the two corners located at both ends of the lower part of the door frame body 12, the configuration of the corners that do not have the reinforcing structure 13 can be changed as appropriate. That is, the corners that do not have the reinforcing structure 13 can be configured from the same plate material as the first upper and lower panel portions P11 and the first left and right panel portions P12, rather than being configured from a single first plate material 21.

[0066] At least one of the support members 53, the first support member 53a of the first reinforcing member 51a and the second support member 53b of the second reinforcing member 51b, may be omitted. The first reinforcing member 51a and the second reinforcing member 51b may be arranged so that the distance L1 is the same as or smaller than the distance L1a. The first reinforcing member 51a and the second reinforcing member 51b may be arranged so that the distance L1 is the same as or smaller than the distance L1b.

[0067] The first reinforcing member 51a and the second reinforcing member 51b may be arranged so that the distance L1 is equal to or smaller than the distance L2a. The first reinforcing member 51a and the second reinforcing member 51b may be arranged so that the distance L1 is equal to or smaller than the distance L2b.

[0068] The first panel P1 of the door frame main body 12 may be a panel disposed on the vehicle outer side relative to the second panel P2, or may be a panel disposed on the vehicle inner side relative to the second panel P2. For example, the first panel P1 may be an inner panel, and the second panel P2 may be an inner panel. Also, for example, either the first panel P1 or the second panel P2 may be a reinforcement panel, or both the first panel P1 and the second panel P2 may be reinforcement panels. Also, for example, the first panel P1 may be an outer panel, and the second panel P2 may be an outer panel. [Explanation of symbols]

[0069] 11...Door frame structure 12...Door frame body 12a...Opening 13...Reinforcement structure 13a...First reinforcing structure 13b...Second reinforcing structure 21...First plate material 22...First corner 23...First upper and lower panel weld 24...First left and right panel weld 25...1st upper and lower connection part 26...1st left and right connecting section 31…Second plate material 32…Second corner 33...Second upper and lower panel weld 34...Second left and right panel weld 35…Second upper and lower connection part 36…Second left and right connecting section 51...Reinforcing member 51a...first reinforcing member 51b...Second reinforcing member 52...Polymer material layer 52a...first polymer material layer 52b…Second polymer material layer 53...Support member 53a...first support member 53b...second support member H1…Hollow part L1,L1a,L1b,L2a,L2b…distance P1...First panel P11: First upper and lower panel section P12...First left and right panel section P13...First corner panel P2: Second panel P21: Second upper and lower panel section P22: Second left and right panel section P23: Second corner panel S1...Side 1 S2…Second side

Claims

1. A hollow structure that constitutes a vehicle door frame body and a reinforcing structure that reinforces the hollow structure, The hollow structure includes a first panel and a second panel arranged opposite each other in an interior / exterior direction of the vehicle; a hollow portion between the first panel and the second panel, The first panel includes a first upper and lower panel portion extending in the vertical direction of the vehicle; First left and right panel portions extending in the width direction or the front-rear direction of the vehicle; a first corner panel portion located between the first upper and lower panel portions and the first left and right panel portions, The first corner panel portion is composed of a single first plate material, The first plate member has a first corner portion, a first upper and lower panel weld portion welded to the first upper and lower panel portion; first left and right panel welds welded to the first left and right panel portions; a first upper and lower connecting portion between the first corner portion and the first upper and lower panel weld portion; a first left-right connecting portion between the first corner portion and the first left-right panel weld portion, the reinforcing structure includes a reinforcing member having a polymeric layer bonded to the first plate and the second panel; A door frame structure in which the polymer material layer is adhered to either one of the first upper and lower connecting portions or the first left and right connecting portions, and is positioned at a distance from the first upper and lower panel welds and the first left and right panel welds.

2. the reinforcing member includes a first reinforcing member and a second reinforcing member disposed spaced apart from the first reinforcing member, the first reinforcing member has a first polymeric material layer bonded to the first vertical connecting portion; The door frame structure according to claim 1 , wherein the second reinforcing member comprises a second polymeric material layer adhered to the first left and right connecting portions.

3. 3. The door frame structure according to claim 2, wherein the distance between the first reinforcing member and the second reinforcing member is greater than the distance between the first reinforcing member and the first upper and lower panel welds, and is also greater than the distance between the second reinforcing member and the first left and right panel welds.

4. 4. The door frame structure of claim 3, wherein at least one of the first polymeric material layer of the first reinforcing member and the second polymeric material layer of the second reinforcing member is a foam layer.

5. At least one of the first reinforcing member and the second reinforcing member has the foam layer and a support member that supports the foam layer, The support member has a first surface facing the first corner panel portion and a second surface facing the second panel portion, The door frame structure according to claim 4 , wherein the foam layer is sandwiched between the first corner panel portion and the first surface and between the second panel portion and the second surface.

6. The door frame structure according to claim 1 , wherein the reinforcing structure is provided corresponding to at least one of two corners located at both ends of the upper portion of the door frame body.

7. The second panel includes a second upper and lower panel portion extending in the vertical direction of the vehicle; second left and right panel portions extending in the width direction or the front-rear direction of the vehicle; a second corner panel portion located between the second upper and lower panel portions and the second left and right panel portions, The second corner panel portion is composed of a single second plate material, The second plate member has a second corner portion, a second upper and lower panel weld portion welded to the second upper and lower panel portion; second left and right panel welds welded to the second left and right panel portions; a second upper and lower connecting portion between the second corner portion and the second upper and lower panel weld portion; a second left-right connecting portion between the second corner portion and the second left-right panel weld portion, 2. The door frame structure of claim 1, wherein the polymer material layer of the reinforcing member is adhered to the second upper and lower connecting portions and the second left and right connecting portions of the second plate material that face the connecting portions adhered in the first plate material, and is positioned at a distance from the second upper and lower panel welds and the second left and right panel welds.

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