Vehicle floor structure and method for manufacturing a vehicle

Abstract

The present invention relates to a vehicle floor structure and a method for manufacturing a vehicle. A vehicle floor structure according to an aspect of the present disclosure is a vehicle floor structure including: a disk-shaped floor; an upper surface side reinforcing member joined to the upper surface of the disk-shaped floor; and a lower surface side reinforcing member joined to the lower surface of the disk-shaped floor. The disk-shaped floor is formed of a resin-coated steel sheet, and a resin layer of the resin-coated steel sheet is formed on the upper surface of the disk-shaped floor, but not on the lower surface of the disk-shaped floor. The lower surface side reinforcing member is formed of a resin-coated steel sheet, and a resin layer of the resin-coated steel sheet is formed on the surface of the lower surface side reinforcing member that contacts the disk-shaped floor.

Description

Technical Field

[0001] The present disclosure relates to a vehicle floor structure and a method for manufacturing a vehicle. Background Art

[0002] As disclosed in Japanese Patent Application Laid-Open No. 2015-202686, a resin-coated steel sheet whose surface is coated with a resin layer and thus has rust prevention performance is used in an automobile. Summary of the Invention

[0003] However, the resin-coated steel sheet is more expensive than the ordinary steel sheet, and therefore it is necessary to appropriately select the parts where the resin-coated steel sheet is used in the automobile.

[0004] Incidentally, the vehicle floor structure is composed of a disk-shaped floor (so-called "floor panel") and reinforcing members (such as floor cross members and floor side members) joined to the disk-shaped floor. Note that since the contact surfaces in the joints (for example, the surfaces in the joints where the reinforcing members contact the disk-shaped floor) are not electroplated, there is a problem that moisture may enter the gaps between the contact surfaces of the joints and may rust.

[0005] At the same time, the present inventors have found that the surface of the disk-shaped floor located inside the vehicle is corroded by, for example, a snow melting agent adhered to the shoes of passengers.

[0006] In view of these circumstances, the present disclosure provides a vehicle floor structure that can suppress corrosion in the contact surfaces between the disk-shaped floor and the upper surface side reinforcing member and the lower surface side reinforcing member, and corrosion of the upper surface of the disk-shaped floor caused by a snow melting agent.

[0007] A vehicle floor structure according to an aspect of the present disclosure includes:

[0008] A disk-shaped floor;

[0009] An upper surface side reinforcing member joined to the upper surface of the disk-shaped floor; and

[0010] A lower surface side reinforcing member joined to the lower surface of the disk-shaped floor, wherein

[0011] The disk-shaped floor is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the disk-shaped floor is formed on the upper surface of the disk-shaped floor, but not on the lower surface of the disk-shaped floor, and

[0012] The lower surface side reinforcing member is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the lower surface side reinforcing member is formed on the surface of the lower surface side reinforcing member that contacts the disk-shaped floor.

[0013] In a vehicle floor structure according to an aspect of the present disclosure, a disk-shaped floor is formed of a resin-coated steel sheet, and a resin layer of the resin-coated steel sheet is formed on an upper surface of the disk-shaped floor, but not on a lower surface thereof; and a lower surface side reinforcing member is formed of a resin-coated steel sheet, and a resin layer of the resin-coated steel sheet is formed on a surface of the lower surface side reinforcing member that contacts the disk-shaped floor. Therefore, corrosion on a contact surface between the disk-shaped floor and the upper surface side reinforcing member and the lower surface side reinforcing member can be suppressed, and corrosion of an upper surface in the disk-shaped floor caused by a snow melting agent can also be suppressed.

[0014] Note that the resin layer of the resin-coated steel sheet forming the disk-shaped floor may be formed on the entire upper surface of the disk-shaped floor.

[0015] The thickness of the resin layer formed on the upper surface of the disk-shaped floor may be greater than the thickness of the resin layer formed on the surface of the lower surface side reinforcing member that contacts the disk-shaped floor.

[0016] In addition, in the resin-coated steel sheet forming the lower surface side reinforcing member, a resin layer may also be formed on a surface of the lower surface side reinforcing member opposite to the surface that contacts the disk-shaped floor; and the thickness of the resin layer formed on the surface opposite to the surface that contacts the disk-shaped floor may be less than the thickness of the resin layer formed on the surface that contacts the disk-shaped floor.

[0017] In addition, in the resin-coated steel sheet forming the lower surface side reinforcing member, no resin layer may be formed on a surface of the lower surface side reinforcing member opposite to the surface that contacts the disk-shaped floor.

[0018] The upper surface side reinforcing member may be formed of a steel sheet not covered with resin. With this structure, production costs can be reduced while suppressing corrosion.

[0019] Each of the upper surface side reinforcing member and the lower surface side reinforcing member may have a hat shape in a cross section perpendicular to its longitudinal direction, and may be joined to the disk-shaped floor at a pair of flange portions that extend in the longitudinal direction.

[0020] Note that an outer periphery of the pair of flange portions joined to the disk-shaped floor may not be coated with any rust-preventive sealant.

[0021] In addition, the overall shape of the flange portion may be flat.

[0022] A method for manufacturing a vehicle according to an aspect of the present disclosure includes electrocoating a disk-shaped floor together with an upper surface side reinforcing member and a lower surface side reinforcing member, the upper surface side reinforcing member being joined to an upper surface of the disk-shaped floor, and the lower surface side reinforcing member being joined to a lower surface of the disk-shaped floor, wherein

[0023] The disk-shaped floor is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the disk-shaped floor is formed on the upper surface of the disk-shaped floor, but not on the lower surface of the disk-shaped floor, and

[0024] The lower surface side reinforcing member is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the lower surface side reinforcing member is formed on the surface of the lower surface side reinforcing member that contacts the disk-shaped floor.

[0025] In a method for manufacturing a vehicle according to an aspect of the present disclosure, the disk-shaped floor is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet is formed on the upper surface of the disk-shaped floor, but not on the lower surface of the disk-shaped floor; and the lower surface side reinforcing member is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet is formed on the surface of the lower surface side reinforcing member that contacts the disk-shaped floor. Therefore, corrosion on the contact surfaces between the disk-shaped floor and the upper surface side reinforcing member and the lower surface side reinforcing member can be suppressed, and corrosion of the upper surface in the disk-shaped floor caused by a snow melting agent can also be suppressed.

[0026] According to the present disclosure, a vehicle floor structure can be provided that can suppress corrosion in the contact surfaces between the disk-shaped floor and the upper surface side reinforcing member and the lower surface side reinforcing member, and can also suppress corrosion of the upper surface in the disk-shaped floor caused by a snow melting agent.

[0027] Based on the following detailed description and the accompanying drawings given only by way of illustration, the above and other objects, features, and advantages of the present disclosure will be more fully understood and thus are not considered to limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic cross-sectional view of a vehicle floor structure according to a first embodiment;

[0029] Figure 2 is Figure 1 a schematic partial cross-sectional view of the area II shown in ;

[0030] Figure 3 is Figure 2 a schematic partial cross-sectional view of the area III shown in ; and

[0031] Figure 4 is a schematic cross-sectional view of a vehicle floor structure according to a modification example of the first embodiment. DETAILED DESCRIPTION

[0032] Specific embodiments to which the present disclosure is applied will be described in detail below with reference to the drawings. However, the present disclosure is not particularly limited to the following embodiments. In addition, for the sake of clear explanation, the following description and drawings have been appropriately simplified.

[0033] (First Embodiment)

[0034] <Structure of Vehicle Floor Structure>

[0035] First, reference will be made to Figure 1 describe the structure of the vehicle floor structure according to the first embodiment. Figure 1 is a schematic cross-sectional view of the vehicle floor structure according to the first embodiment. As shown in Figure 1 In the figure, the vehicle floor structure according to this embodiment includes a disk-shaped floor 10, an upper floor side member 21, a tunnel side frame 22, a floor cross member 23, and a lower floor side member 30.

[0036] Note that the upper floor side member 21, the tunnel side frame 22, and the floor cross member 23 constitute an upper surface side reinforcing member joined to the upper surface (inner surface of the vehicle) of the disk-shaped floor 10. At the same time, the lower floor side member 30 is an upper surface side reinforcing member joined to the lower surface (outer surface of the vehicle) of the disk-shaped floor 10.

[0037] Naturally, Figure 1 the right-handed xyz orthogonal coordinate system shown in this and other figures is common to all the drawings, and they are only for facilitating the explanation of the positional relationship between the components. In the example shown in the drawings, the positive direction of the x-axis indicates the forward direction of the vehicle; the direction of the y-axis indicates the vehicle width direction; and the positive direction of the z-axis indicates the vertically upward direction.

[0038] In addition, when viewed from the front of the vehicle (positive direction of the x-axis), the vehicle floor structure according to this embodiment has a left-right symmetric structure, and only the left half of the vehicle floor structure is shown in Figure 1 the figure.

[0039] In addition, the vehicle floor structure according to this embodiment only needs to include at least one upper surface side reinforcing member joined to the upper surface of the disk-shaped floor 10 and one lower surface side reinforcing member joined to the lower surface of the disk-shaped floor 10. The upper surface side reinforcing member and the lower surface side reinforcing member are not particularly limited to Figure 1 those shown in the figure.

[0040] The disk-shaped floor 10 is a plate-shaped steel plate member that constitutes the main part of the vehicle floor structure. As shown in Figure 1As shown in the figure, the disk-shaped floor 10 includes a floor passage 11 at the center in the vehicle width direction (y-axis direction). The floor passage 11 extends in the vehicle front / rear direction (x-axis direction) and extends upward from the flat part in a passage shape.

[0041] At each of the two ends of the disk-shaped floor 10 in the vehicle width direction (y-axis direction), a flange portion 12 rises from the flat part. The flange portion 12 is joined to, for example, a side beam (not shown).

[0042] The disk-shaped floor 10 is formed by extrusion molding, for example, from a single steel plate.

[0043] The upper floor side member 21 is an upper surface side reinforcing member joined to the upper surface of the disk-shaped floor 10. As shown in Figure 1 the figure, the upper floor side member 21 extends in the vehicle front / rear direction (x-axis direction), for example, in the middle part between the floor passage 11 and the flange portion 12 of the disk-shaped floor 10.

[0044] Note that Figure 2 is Figure 1 a schematic partial cross-sectional view of region II shown in the figure. As shown in Figure 2 the figure, the upper floor side member 21 is a steel plate member having a hat shape in a cross-section perpendicular to the longitudinal direction (x-axis direction). That is, the upper floor side member 21 includes a top plate 21a, a pair of side walls 21b, and a pair of flange portions 21c.

[0045] Note that these parts in the upper floor side member 21 are defined only for explanatory purposes. In addition, the structure of the upper floor side member 21 is not particularly limited to Figure 1 and Figure 2 the example shown in the figure.

[0046] More specifically, a pair of side walls 21b are formed downward from the ends in the width direction (y-axis) of the top plate 21a extending in the vehicle front / rear direction (x-axis direction). In addition, the flange portions 21c protrude outward from the lower ends of each side wall 21b. The upper floor side member 21 is formed by extrusion molding, for example, from a single steel plate.

[0047] As shown in Figure 2 the figure, a pair of flange portions 21c of the upper floor side member 21 are joined to the upper surface of the flat part of the disk-shaped floor 10 by welding, screwing, etc. The entire flange portion 21c is formed into a flat shape, and the upper floor side member 21 has a simple structure.

[0048] The passage side frame 22 is an upper surface side reinforcing member joined to the upper surface of the disk-shaped floor 10. As shown in Figure 1As shown in the figure, the channel side frame 22 extends in the vehicle front / rear direction (x-axis direction) from the flat part of the disk-shaped floor 10 to the side wall of the floor channel 11. That is, the channel side frame 22 strengthens the floor channel 11 in the disk-shaped floor 10.

[0049] More specifically, as shown in Figure 1 the channel side frame 22 includes an L-shaped main body portion whose cross-sectional shape is perpendicular to the longitudinal (x-axis) direction and a pair of flange portions protruding from both ends of the main body portion in the vehicle width direction (y-axis direction). As shown in Figure 1 one flange portion of the channel side frame 22 is joined to the flat part of the disk-shaped floor 10, and the other flange portion of the channel side frame 22 is joined to the side wall of the floor channel 11 of the disk-shaped floor 10.

[0050] The floor transverse member 23 is an upper surface side strengthening member joined to the upper surface of the disk-shaped floor 10. As shown in Figure 1 the floor transverse member 23 extends in the vehicle width direction (y-axis direction) from the flange portion 12 of the disk-shaped floor 10 to the channel side frame 22.

[0051] More specifically, similar to the upper side floor side member 21, the floor transverse member 23 is a steel plate member having a hat-shaped cross-section perpendicular to the longitudinal direction (y-axis direction). That is, the floor transverse member 23 includes a top plate, a pair of side walls, and a pair of flange portions. The flange portions of the floor transverse member 23 are joined to the upper surface of the main body portion of the disk-shaped floor 10 by welding, screwing, etc. The entire flange portion of the floor transverse member 23 is formed into a flat shape, and the floor transverse member 23 has a simple structure.

[0052] The floor transverse member 23 is formed by, for example, extrusion molding of one steel plate.

[0053] The lower side floor side member 30 is a lower surface side strengthening member joined to the lower surface of the disk-shaped floor 10. As shown in Figure 1 the lower side floor side member 30 extends, for example, in the vehicle front / rear direction (x-axis direction) in the middle part between the floor channel 11 and the flange portion 12 of the disk-shaped floor 10. Note that the lower side floor side member 30 is opposite to the upper side floor side member 21 with the disk-shaped floor 10 in between. Note that the lower side floor side member 30 may be displaced (i.e., offset) in the vehicle width direction (y-axis direction) with respect to the upper side floor side member 21.

[0054] As shown in Figure 2As shown in the figure, the lower floor side member 30 has the same shape as the vertically inverted shape of the upper floor side member 21, and is a steel plate member having a hat shape in a cross section perpendicular to the longitudinal direction (x-axis direction). That is, the lower floor side member 30 includes a bottom plate 30a, a pair of side walls 30b, and a pair of flange portions 30c. Note that the bottom plate 30a of the lower floor side member 30 corresponds to the top plate 21a of the upper floor side member 21.

[0055] More specifically, a pair of side walls 30b are formed upward from the end portions in the width direction (y-axis) of the bottom plate 30a extending in the vehicle front / rear direction (x-axis). In addition, the flange portions 30c project outward from the upper ends of each side wall 30b. The lower floor side member 30 is formed by, for example, extrusion molding of a single steel plate.

[0056] As shown in Figure 2 the figure, a pair of flange portions 30c of the lower floor side member 30 are joined to the lower surface of the flat portion of the disk-shaped floor 10 by welding, screwing, etc. The entire flange portion 30c is formed into a flat shape, and the lower floor side member 30 has a simple structure.

[0057] Note that in the vehicle floor structure according to this embodiment, the upper surface side reinforcing member (such as the upper floor side member 21) is joined to the upper surface of the disk-shaped floor 10, and the lower surface side reinforcing member (the lower floor side member 30) is joined to the lower surface of the disk-shaped floor 10. Then, the disk-shaped floor 10 (i.e., the vehicle floor structure according to this embodiment) to which the upper surface side reinforcing member and the lower surface side reinforcing member are joined is electrodeposited. After the electrodeposition, the vehicle floor structure can be further painted with, for example, an intermediate coat and a top coat.

[0058] Note that Figure 3 is Figure 2 a schematic partial cross-sectional view of Region III shown in the figure. As shown in Figure 2 and Figure 3 the figure, the disk-shaped floor 10 is made of resin-coated steel plate. In the disk-shaped floor 10, the upper surface of the steel plate SS1 is coated with the resin layer RL11, and the lower surface of the steel plate SS1 is not coated with any resin layer. That is, as shown in Figure 2 and 3 the figure, the resin layer RL11 is formed on the surface of the disk-shaped floor 10 that contacts the upper surface side reinforcing member (such as the upper floor side member 21).

[0059] In addition, as shown in Figure 2 and Figure 3 the figure, the lower surface side reinforcing member (the lower floor side member 30) is also made of resin-coated steel plate. In the lower floor side member 30, the upper surface of the steel plate SS3 is coated with the resin layer RL31. That is, as shown inFigure 2 and 3 As shown in 3 , the resin layer RL31 is formed on the surface of the lower floor side member 30 that contacts the disk-shaped floor 10.

[0060] As described above, in the related art, when the disk-shaped floor to which the upper surface side reinforcing member and the lower surface side reinforcing member are joined is electroplated, the contact surfaces between the upper surface side reinforcing member and the lower surface side reinforcing member and the disk-shaped floor cannot be electroplated, and thus there is a risk of corrosion. Therefore, it is necessary to apply an antirust sealant to the boundary line between the disk-shaped floor and the flange portions of the upper surface side reinforcing member and the lower surface side reinforcing member. That is, the upper surface side reinforcing member and the lower surface side reinforcing member are joined to the disk-shaped floor at their flange portions, and it is necessary to apply an antirust sealant to the outer peripheries of these flange portions.

[0061] In contrast, in the vehicle floor structure according to this embodiment, both the disk-shaped floor 10 and the lower surface side reinforcing member (lower floor side member 30) are made of resin-coated steel sheets as shown in 3 . Note that the resin layer RL11 is formed on the surface of the disk-shaped floor 10 that contacts the upper surface side reinforcing member (upper floor side member 21, etc.). In addition, the resin layer RL31 is formed on the surface of the lower floor side member 30 that contacts the disk-shaped floor 10. Figure 2

[0062] Therefore, due to the resin layer RL11, corrosive substances such as water, oxygen, and chlorine are difficult to reach the steel sheet SS1 of the disk-shaped floor 10 and the upper surface side reinforcing member (upper floor side member 21, etc.) formed of the steel sheet. Similarly, due to the resin layer RL31, corrosive substances are difficult to reach the steel sheet SS1 of the disk-shaped floor 10 and the steel sheet SS3 of the lower floor side member 30. Therefore, corrosion in the contact surfaces between the upper surface side reinforcing member (upper floor side member 21, etc.) and the disk-shaped floor 10 and between the lower floor side member 30 and the disk-shaped floor 10 can be suppressed.

[0063] As a result, there is no need to apply an antirust sealant to the boundary line between the disk-shaped floor 10 and the flange portion of the upper surface side reinforcing member (such as the flange portion 21c of the upper floor side member 21, etc.), that is, to the outer periphery of the flange portion. Similarly, there is no need to apply an antirust sealant to the boundary line between the disk-shaped floor 10 and the flange portion of the lower surface side reinforcing member (such as the flange portion 30c of the lower floor side member 30, etc.), that is, to the outer periphery of the flange portion.

[0064] In addition, in the vehicle floor structure in the related art, a flow channel (tongue-and-groove structure) is formed inside the flange portion of the upper floor side member and / or the lower floor side member to supply the electrodeposition coating solution. In contrast, in the vehicle floor structure according to this embodiment, since the disk-shaped floor 10 is made of a resin-coated steel plate, there is no need to provide a tongue-and-groove structure in the flange portion 21c of the upper floor side member 21 or the flange portion 30c of the lower floor side member 30. Therefore, the flange portions 21c of the entire upper floor side member 21 and the flange portions 30c of the lower floor side member 30 can be formed into a flat shape. That is, the structures of the upper floor side member 21 and the lower floor side member 30 are simplified, and thus the manufacturing cost can be reduced.

[0065] In addition, since almost the entire upper surface of the steel plate SS1 in the disk-shaped floor 10 is covered with the resin layer RL11, corrosion of the disk-shaped floor 10 caused by, for example, a snow melting agent adhering to the shoes of passengers can also be suppressed.

[0066] Note that, as described later, when the resin layers RL11 and RL31 contain rust-preventive pigments, corrosion can be further suppressed.

[0067] Note that the steel plates SS1 and SS3 are made of ordinary steel and steel containing additive elements (such as chromium), but are not particularly limited thereto. In addition, a plating film can be provided on the surfaces of the steel plates SS1 and SS3 to enhance the rust prevention performance. That is, the steel plates SS1 and SS3 can be plated steel plates. Examples of the plating film include, but are not particularly limited to, a plating film containing any one of metal elements such as zinc, aluminum, cobalt, tin, and nickel, and an alloy plating film containing at least one of these metal elements.

[0068] In addition, the resin layers RL11 and RL31 are made of an organic resin (such as an aqueous coating composition or an organic solvent-based coating composition), but are not particularly limited thereto. Examples of the organic resin include polyurethane resin, polyester resin, epoxy resin, (meth)acrylic resin, polyolefin resin, modified resins thereof, and mixtures thereof.

[0069] The organic resin contains, for example, a rust-preventive pigment and has rust prevention performance. The rust-preventive pigment contains, but is not limited to, fine particles of at least one of, for example, silicate compounds, phosphate compounds, vanadate compounds, and metal oxides. The rust-preventive pigment is, for example, nanoparticles having a volume average diameter of about 1 to 50 nm, fine particles having a volume average diameter of about 0.5 to 10 μm, or a mixture thereof. The amount of the rust-preventive pigment added to the resin layers RL1 and RL2 can be, for example, 1 to 40% by volume or 2 to 20% by volume.

[0070] In addition, the organic resin may contain, for example, a conductive pigment and may thus be conductive. The conductive pigment includes, but is not particularly limited to, fine particles of at least one of, for example, metals, alloys, conductive carbon, iron phosphide, carbides, and semiconductor oxides. The volume average diameter of the fine particles is, for example, about 0.5 to 10 μm. The amount of the conductive pigment added to the resin layers RL1 and RL2 may be, for example, 1 to 40% by volume or 2 to 20% by volume.

[0071] The thicknesses of the resin layers RL1 and RL2 are, for example, 0.5 to 10 μm. Since the thicknesses of the resin layers RL1 and RL2 are 0.5 μm or more, corrosion resistance can be obtained, and since the thicknesses of the resin layers RL1 and RL2 are 10 μm or less, breakage or delamination of the resin layers RL1 and RL2 during extrusion molding or the like can be suppressed. The thicknesses of the resin layers RL1 and RL2 may be, for example, 1 to 5 μm.

[0072] In addition, the thicknesses of the resin layers RL11 and RL31 are not limited to any specific value. However, the thickness of the resin layer RL11 formed on the upper surface of the disk-shaped floor 10 may be greater than the thickness of the resin layer RL31 formed on the surface of the lower-side floor side member 30 that contacts the disk-shaped floor 10. Corrosion of the disk-shaped floor 10 caused by a snow melting agent can be more effectively suppressed.

[0073] Note that, in order to improve the adhesion, corrosion resistance, etc. of the resin layer RL11 to the steel plate SS1, a primer coating film may be provided between the surfaces of the resin layer RL11 and the steel plate SS1. In addition, in order to improve the adhesion, corrosion resistance, etc. of the resin layer RL31 to the steel plate SS3, a primer coating film may be provided between the surfaces of the resin layer RL31 and the steel plate SS3. The number of layers and the composition of the primer coating film are not limited to any specific number and any specific composition.

[0074] In addition, although no resin layer is formed on the end faces of the steel plates SS1 and SS3 in this embodiment, a resin layer may be formed on the end faces of the steel plates SS1 and SS3.

[0075] As explained above, in the vehicle floor structure according to this embodiment, each of the dish-shaped floor 10 and the lower surface side reinforcing member (lower side floor side member 30) is formed of a resin-coated steel sheet. Note that a resin layer RL11 is formed on the surface of the dish-shaped floor 10 that contacts the upper surface side reinforcing member (upper side floor side member 21, etc.). Further, a resin layer RL31 is formed on the surface of the lower side floor side member 30 that contacts the dish-shaped floor 10, that is, on the upper surface of the lower side floor side member 30. Accordingly, corrosion in the contact surfaces between the dish-shaped floor 10 and the upper surface side reinforcing member (upper side floor side member 21, etc.) and the lower surface side reinforcing member (lower side floor side member 30) can be suppressed, and corrosion of the upper surface of the dish-shaped floor 10 caused by a snow melting agent can also be suppressed.

[0076] Note that the upper surface side reinforcing member (upper side floor side member 21, etc.) may be formed of a resin-coated steel sheet.

[0077] However, as shown in Figure 2 , by forming only each of the dish-shaped floor 10 and the lower surface side reinforcing member of a resin-coated steel sheet and forming the upper surface side reinforcing member of an ordinary steel sheet without resin coating, the manufacturing cost can be reduced.

[0078] (Modification example)

[0079] Next, with reference to Figure 4 , the structure of the vehicle floor structure according to a modification example of the above embodiment will be described. Figure 4 is a schematic cross-sectional view of a vehicle floor structure according to a modification example of the first embodiment. Figure 4 is the cross-section corresponding to that shown in Figure 3 .

[0080] The vehicle floor structure according to this modification example has a structure similar to that of the vehicle floor structure according to the first embodiment shown in Figure 1 .

[0081] As shown in Figure 4 , in the vehicle floor structure according to the modification example, the lower surface of the lower surface side reinforcing member (lower side floor side member 30) is also coated with a resin layer RL32. In the lower side floor side member 30 shown in Figure 4 , the upper surface of the steel sheet SS3 is coated with a resin layer RL31, and the lower surface of the steel sheet SS3 is coated with a resin layer RL32. In other words, the resin layer RL31 is formed on the surface of the lower side floor side member 30 that contacts the dish-shaped floor 10, and the resin layer RL32 is formed on the surface of the lower side floor side member 30 opposite to the surface that contacts the dish-shaped floor 10.

[0082] Due to the resin layer RL32, corrosion of the lower surface of the lower floor side member 30 can be suppressed.

[0083] The resin layer RL32 is a resin layer similar to the resin layer RL31. The thickness of the resin layer RL32 can be less than the thickness of the resin layer RL31, but it does not necessarily have to be less than the thickness of the resin layer RL31. With this structure, the manufacturing cost can be reduced.

[0084] The rest of this structure is similar to Figure 3 the vehicle floor structure according to the first embodiment shown in Figure 3 As shown in

[0085] By adopting a structure in which only the resin layer RL31 is formed on the upper surface of the lower floor side member 30 and the resin layer RL32 is not formed on the lower surface of the lower floor side member 30, compared with the modified example, the manufacturing cost can be further reduced. According to the disclosure described as such, it will be obvious that the embodiments of the present disclosure can be changed in many ways. These changes will not be regarded as departing from the spirit and scope of the present disclosure, and it will be obvious to those skilled in the art that all such modifications are intended to be included within the scope of the appended claims.

Claims

1. A vehicle floor structure, comprising: A disc-shaped floor; An upper surface side reinforcing member joined to the upper surface of the disc-shaped floor; And A lower surface side reinforcing member joined to the lower surface of the disc-shaped floor, wherein: The disc-shaped floor is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the disc-shaped floor is formed on the upper surface of the disc-shaped floor, but not on the lower surface of the disc-shaped floor, and The lower surface side reinforcing member is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the lower surface side reinforcing member is formed on the surface of the lower surface side reinforcing member that contacts the disc-shaped floor.

2. The vehicle floor structure according to claim 1, wherein, The resin layer of the resin-coated steel sheet forming the disc-shaped floor is formed on the entire upper surface of the disc-shaped floor.

3. The vehicle floor structure according to claim 1 or 2, wherein, The thickness of the resin layer formed on the upper surface of the disc-shaped floor is greater than the thickness of the resin layer formed on the surface of the lower surface side reinforcing member that contacts the disc-shaped floor.

4. The vehicle floor structure according to any one of claims 1 to 3, wherein: In the resin-coated steel sheet forming the lower surface side reinforcing member, a resin layer is further formed on the surface of the lower surface side reinforcing member opposite to the surface that contacts the disc-shaped floor; and The thickness of the resin layer formed on the surface opposite to the surface that contacts the disc-shaped floor is less than the thickness of the resin layer formed on the surface that contacts the disc-shaped floor.

5. The vehicle floor structure according to any one of claims 1 to 3, wherein, In the resin-coated steel sheet forming the lower surface side reinforcing member, no resin layer is formed on the surface of the lower surface side reinforcing member opposite to the surface that contacts the disc-shaped floor.

6. The vehicle floor structure according to any one of claims 1 to 5, wherein, The upper surface side reinforcing member is formed of a steel sheet not covered with resin.

7. The vehicle floor structure according to any one of claims 1 to 6, wherein, Each of the upper surface side reinforcing member and the lower surface side reinforcing member has a cap shape in a cross-section perpendicular to its longitudinal direction and is joined to the disc-shaped floor at a pair of flange portions that extend in the longitudinal direction.

8. The vehicle floor structure according to claim 7, wherein, The outer peripheries of the pair of flange portions joined to the disc-shaped floor are not coated with any rust-preventive sealant.

9. The vehicle floor structure according to claim 7 or 8, wherein, The overall shape of the flange portion is flat.

10. A method for manufacturing a vehicle, the method including electrocoating a disc-shaped floor together with an upper surface side reinforcing member and a lower surface side reinforcing member, the upper surface side reinforcing member being joined to the upper surface of the disc-shaped floor, and the lower surface side reinforcing member being joined to the lower surface of the disc-shaped floor, wherein: The disc-shaped floor is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the disc-shaped floor is formed on the upper surface of the disc-shaped floor, but not on the lower surface of the disc-shaped floor, and The lower surface side reinforcing member is formed of a resin-coated steel sheet, and the resin layer of the resin-coated steel sheet forming the lower surface side reinforcing member is formed on the surface of the lower surface side reinforcing member that contacts the disc-shaped floor.

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