Vehicle roof

Abstract

To provide a roof for a vehicle that secures chip resistance in a standing wall area while suppressing a cost increase when using a resin-coated steel plate in the vehicle.SOLUTION: A roof 100 for a vehicle is composed using a resin-coated steel plate 10 in at least a part thereof. The resin-coated steel plate 10 includes a steel plate 11 and a resin layer 12 coating the steel plate 11. A vehicle front end 10a of the resin-coated steel plate 10 includes a standing wall area 10b standing in an upward direction of the vehicle in a front of the vehicle and a roof front end area 10c extending toward a central side of the vehicle from the standing wall area 10b. A vehicle outer surface of the steel plate 11 in the standing wall area 10b is covered with a first resin layer 12b. The vehicle outer surface of the steel plate 11 in the standing wall area 10b is covered with a second resin layer 12c. The first resin layer 12b is thicker than the second resin layer 12c.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle roof, and more particularly to a vehicle roof using a resin-coated steel sheet. [Background technology]

[0002] Patent Document 1 discloses that a resin-coated steel sheet, the surface of which is covered with a resin layer and has rust prevention properties and chipping resistance, is used in a vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-202686 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present inventors have discovered the following problems. In the vertical wall region of the roof at the front of the vehicle, since it is located at a high position on the vehicle, it is difficult for the nozzle supplying the chip-resistant material to access it, and it may be difficult to impart chip resistance. In such cases, sufficient chip resistance cannot be ensured, which may cause rust. On the other hand, since resin-coated steel sheets are more expensive than normal steel sheets that are not coated with a resin layer, for example, if the resin layer of the entire roof is made to be the same thickness, the cost will be high.

[0005] In view of the above-mentioned problems, the present invention has an object to provide a vehicle roof that ensures chip resistance in the vertical wall region while suppressing the increase in cost when a resin-coated steel sheet is used in a vehicle. [Means for solving the problem]

[0006] A vehicle roof according to one embodiment of the present invention includes: A vehicle roof constructed at least in part using a resin-coated steel plate, The resin-coated steel sheet includes a steel sheet and a resin layer coating the steel sheet, The resin-coated steel plate has a vehicle front end portion including a vertical wall region rising upward in the front of the vehicle and a roof front end region extending from the vertical wall region toward the center of the vehicle, The vehicle outer surface of the steel plate in the vertical wall region is covered with a first resin layer, The vehicle outer surface of the steel plate in the roof front end region is covered with a second resin layer, The first resin layer is thicker than the second resin layer.

[0007] According to this configuration, the vehicle outer surface of the steel sheet in the vertical wall region is coated with a first resin layer that is thicker than the second resin layer in the roof front end region. Therefore, the vertical wall region of the roof is provided with chip resistance by the first resin layer. Therefore, chip resistance can be easily imparted to the vertical wall region of the roof. Therefore, the chip resistance of the vertical wall region of the roof can be sufficiently ensured. In addition, the vehicle outer surface of the steel sheet in the roof front end region is coated with a second resin layer that is thinner than the first resin layer. Therefore, the amount of resin layer used in the roof front end region can be reduced, and an increase in costs when using a resin-coated steel sheet in a vehicle can be suppressed.

[0008] A vehicle roof according to one embodiment of the present invention includes: A vehicle roof constructed at least in part using a resin-coated steel plate, The resin-coated steel sheet includes a steel sheet and a resin layer coating the steel sheet, The resin-coated steel plate has a vehicle front end portion including a vertical wall region rising upward in the front of the vehicle and a roof front end region extending from the vertical wall region toward the center of the vehicle, The vehicle outer surface of the vertical wall region is covered with a first resin layer, The vehicle outer surface of the steel plate in the roof front end region is not covered with a resin layer.

[0009] According to this configuration, the outer surface of the steel plate in the vertical wall region is covered with a resin layer, so that chip resistance can be ensured, and the outer surface of the steel plate in the roof front end region is not covered with a resin layer, so that the amount of resin layer used can be reduced, and thus costs can be reduced.

[0010] The steel plate in the vertical wall region and the steel plate in the roof front end region may be formed using a tailored blank material.

[0011] According to this configuration, the steel plate in the vertical wall region and the steel plate in the roof front end region can be manufactured using a tailored blank material.

[0012] Further, the vehicle inner surface of the steel plate in the vertical wall region is covered with a third resin layer, The first resin layer may be thicker than the third resin layer.

[0013] According to this configuration, the first resin layer is thicker than the third resin layer, so that the outer surface of the steel sheet in the vertical wall region has high chip resistance. Also, the third resin layer is thinner than the first resin layer, so that the amount of resin layer used on the inner surface of the vertical wall region can be reduced. Therefore, it is possible to prevent an increase in cost when using the resin-coated steel sheet in a vehicle.

[0014] The vehicle inner surface of the steel plate in the vertical wall region may be not covered with a resin layer.

[0015] According to this configuration, the amount of the resin layer used on the vehicle inner surface of the vertical wall region is 0 (zero), which makes it possible to suppress an increase in cost when using the resin-coated steel sheet in a vehicle. Effect of the Invention

[0016] The present invention can provide a vehicle roof that ensures chip resistance in the vertical wall region while suppressing increases in cost when a resin-coated steel sheet is used in a vehicle. [Brief description of the drawings]

[0017] [Figure 1] 1 is a top view of an example of a vehicle roof according to a first embodiment. [Diagram 2] 2 is a cross-sectional view of a vehicle front end portion of an example of a vehicle roof according to the first embodiment. FIG. [Diagram 3] 4 is a cross-sectional view of a vehicle front end portion of a first modified example of a vehicle roof according to the first embodiment. FIG. [Figure 4] 13 is a cross-sectional view of a vehicle front end portion of a second modified example of the vehicle roof according to the first embodiment. FIG. [Diagram 5] 13 is a cross-sectional view of a vehicle front end portion of a third modified example of the vehicle roof according to the first embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. In addition, the following description and drawings are appropriately simplified for clarity of explanation.

[0019] (Embodiment 1) A vehicle roof according to embodiment 1 will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a top view of an example of a vehicle roof according to embodiment 1. Fig. 2 is a cross-sectional view of a vehicle front end portion of the example of the vehicle roof shown in Fig. 1.

[0020] Naturally, the right-handed xyz coordinate system shown in Fig. 1 and other drawings is for the convenience of explaining the positional relationship of the components. Usually, the positive direction of the z axis is the upper side (UP) of the vehicle, the negative direction of the x axis is the front side (FR) of the vehicle, the positive direction of the x axis is the rear side (RR) of the vehicle, and the xy plane is the horizontal plane, which are common among the drawings.

[0021] As shown in Fig. 1, the vehicle roof 100 is at least partially constructed using a resin-coated steel sheet 10. The vehicle roof 100 may be formed by appropriately processing the resin-coated steel sheet 10. A vehicle front end 10a of the vehicle roof 100 is connected to a windshield 20. A side portion of the vehicle roof 100 is connected to a side panel 30.

[0022] The resin-coated steel sheet 10 comprises a steel sheet 11 and a resin layer 12 .

[0023] The steel sheet 11 has a roof shape. The steel sheet 11 has mechanical properties required for a vehicle roof. Specifically, the steel sheet 11 may be made of ordinary steel or steel containing an additive element such as chromium. A plating film may be provided on the surface of the steel sheet 11. The type of the plating film on the surface of the steel sheet 11 is not particularly limited. Applicable plating films include, for example, plating containing any one of zinc, aluminum, cobalt, tin, and nickel, and alloy plating containing these metal elements and other metal elements and nonmetal elements. Depending on the application, both sides, only one side, a part of the surface, or the entire surface of the metal sheet may be covered with a coating film.

[0024] The resin layer 12 covers the vehicle upper surface of the steel sheet 11. The resin layer 12 has chip resistance. The resin layer 12 contains a resin and has higher corrosion resistance than the steel sheet 11. Such a resin is, for example, an organic resin such as a water-based coating composition or an organic solvent-based coating composition. In order to further improve the adhesion of the resin layer 12 to the steel sheet 11 and the corrosion resistance, etc., a base treatment film may be provided between the resin layer 12 and the surface of the steel sheet 11. When a base treatment film is provided in this way, the number and composition of the layers of the base treatment film are not limited. The resin layer 12 may further contain a pigment or a chip-resistant material. Such a pigment is, for example, an anti-rust pigment or a conductive pigment. The type of the anti-rust pigment and the type of the conductive pigment are not particularly limited, but it is preferable that the anti-rust pigment contains at least one type selected from, for example, a silicate compound, a phosphate compound, a vanadate compound, and metal oxide fine particles. The conductive pigment preferably contains at least one selected from the group consisting of metals, alloys, conductive carbon, iron phosphide, carbides, and semiconductor oxides. The resin layer 12 covers the upper surface of the steel sheet 11, thereby improving the chip resistance and rust prevention of the steel sheet 11.

[0025] The resin-coated steel sheet 10 may include at least one of an electrodeposition coating layer, an intermediate coating layer, and a topcoat coating layer. At least one of the electrodeposition coating layer, the intermediate coating layer, and the topcoat coating layer covers at least a part of the resin layer 12.

[0026] As shown in FIG. 2, the vehicle front end portion 10a of the resin-coated steel sheet 10 has a vertical wall region 10b that rises upward in the front of the vehicle, and a roof front end region 10c. The roof front end region 10c extends from the vertical wall region 10b toward the center of the vehicle, and includes, for example, the region surrounding the vertical wall region 10b. The resin layer 12b (which may be referred to as a first resin layer) in the vertical wall region 10b is thicker than the resin layer 12c (which may be referred to as a second resin layer) in the roof front end region 10c. In other words, the thickness t b is the thickness t of the resin layer 12c c Compared to, it is large.

[0027] As described above, according to the configuration of the vehicle roof 100, the vehicle outer surface of the steel plate 11 in the vertical wall region 10b is coated with a resin layer 12b that is thicker than the resin layer 12c in the roof front end region 10c. Thus, the vertical wall region 10b of the vehicle roof 100 is provided with chip resistance by the resin layer 12. Therefore, chip resistance can be easily provided to the vertical wall region 10b of the vehicle roof 100. Therefore, the chip resistance of the vertical wall region 10b of the vehicle roof 100 can be sufficiently ensured.

[0028] Furthermore, according to the configuration of the vehicle roof 100, the vehicle outer surface of the steel sheet 11 in the roof front end region 10c is covered with the resin layer 12c, compared to the resin layer 12b. Therefore, the total amount of the resin layer used in the roof front end region 10c can be reduced, and an increase in cost when the resin-coated steel sheet 10 is used in a vehicle can be suppressed.

[0029] Next, an example of a manufacturing method of the vehicle roof 100 will be described. First, a coating film is applied onto the vehicle upper surface of the steel plate 11 to form a resin layer 12 on the vehicle upper surface of the steel plate 11. In this way, a resin-coated steel plate 10 is obtained. Next, the resin-coated steel plate 10 is processed or formed into the shape of the part to which the vehicle roof 100 is applied. In this manner, the vehicle roof 100 can be manufactured. If necessary, at least one of electrocoating, undercoating, and topcoating may be applied to the processed or formed resin-coated steel plate 10.

[0030] (First Modification) Next, a first modified example of the vehicle roof 100 according to the first embodiment shown in Fig. 3 will be described. Fig. 3 is a cross-sectional view of the vehicle front end of the first modified example of the vehicle roof shown in Fig. 1.

[0031] The vehicle roof 100a shown in FIG. 3 has the same configuration as the vehicle roof 100 shown in FIGS. 1 and 2, except for the vehicle front end portion 110a. The vehicle front end portion 110a has the same configuration as the vehicle front end portion 10a, except for the portion not including the resin layer 12c. The vehicle outer surface of the steel plate 11 in the roof front end region 10c of the vehicle front end portion 110a is not covered with the resin layer 12. In other words, the thickness t of the resin layer in the roof front end region 10c of the vehicle roof 100a is c is 0 (zero).

[0032] As described above, according to the configuration of the vehicle roof 100a, the vehicle outer surface of the steel plate 11 in the vertical wall region 10b is coated with the resin layer 12b, similar to the vehicle roof 100. Therefore, the chip resistance of the vertical wall region 10b of the vehicle roof 100 can be sufficiently ensured. In addition, since the vehicle outer surface of the steel plate 11 in the roof front end region 10c is not covered with the resin layer 12, the amount of resin layer used in the roof front end region 10c is 0 (zero). Therefore, the amount of resin layer used can be suppressed, and further cost reduction can be achieved.

[0033] (Second Modification) Next, a second modified example of the vehicle roof 100 according to the first embodiment will be described, which is shown in Fig. 4. Fig. 4 is a cross-sectional view of the vehicle front end of the second modified example of the vehicle roof shown in Fig. 1.

[0034] The vehicle roof 100b shown in FIG. 4 has the same configuration as the vehicle roof 100 shown in FIGS. 1 and 2, except for the vehicle front end 210a. The vehicle front end 210a has the same configuration as the vehicle front end 10a, except for the steel plate 211c. The steel plate 11b and the resin layer 12b in the vertical wall region 10b and the steel plate 211c and the resin layer 12c in the roof front end region 10c are formed using a tailored blank material. Here, the tailored blank material is a press steel material in which a plurality of tailored blank steel plates having different material types and thicknesses are welded or joined. The material types and thicknesses of the plurality of tailored blank steel plates are determined according to the parts of the press-formed body. In addition, each of the plurality of tailored blank steel plates has a resin layer, and the resin layers may be different in type and thickness. The steel plate 11b and the steel plate 211c may be different in material type, thickness, etc. The resin layer 12b and the resin layer 12c may be different in type of material, thickness, etc. The steel plate 211c according to this embodiment is thinner than the steel plate 11b, and the resin layer 12c is thinner than the resin layer 12b. The resin-coated steel plate of the vehicle roof 100b may be manufactured, for example, by welding steel plates for tailored blanks corresponding to the steel plate 211c and the steel plate 11b to each other to form a steel material for pressing, and then press-forming the steel material for pressing. The vehicle outer surface of the steel plate corresponding to the steel plate 211c is coated with the resin layer 12b. The vehicle outer surface of the steel material for pressing corresponding to the steel plate 11b is coated with the resin layer 12c.

[0035] As described above, according to the configuration of the vehicle roof 100b, the steel plate 11b in the vertical wall region 10b and the steel plate 211c in the roof front end region 10c can be manufactured using a tailored blank material. The vehicle roof 100b having a different thickness of the resin layer depending on the region can be easily manufactured using a tailored blank steel plate in which the thickness of the resin layer and the presence or absence of the resin layer are constant regardless of the region. In other words, the vehicle roof 100b having a different thickness of the resin layer depending on the region can be easily manufactured without changing the thickness of the resin layer or the presence or absence of the resin layer in the same press steel material.

[0036] (Third modified example) Next, a third modified example of the vehicle roof 100 according to the first embodiment shown in Fig. 5 will be described. Fig. 5 is a cross-sectional view of the vehicle front end of the third modified example of the vehicle roof shown in Fig. 1.

[0037] The vehicle roof 100c shown in FIG. 5 has the same configuration as the vehicle roof 100 shown in FIG. 1, except for the resin layer 12d. The vehicle roof 100c includes a resin layer 12d, which covers at least a part of the vehicle underside surface of the steel plate 11. The resin layer 12d has the same configuration as the resin layer 12. The thickness t of the resin layer 12d d is the thickness t of the resin layer 12b b is small compared to

[0038] As described above, according to the configuration of the vehicle roof 100c, the vehicle outer surface of the steel plate 11 in the vertical wall region 10b is coated with the resin layer 12b, as in the vehicle roof 100. Therefore, the chip resistance of the vertical wall region 10b of the vehicle roof 100 can be sufficiently ensured. In addition, the vehicle outer surface of the steel plate 11 in the roof front end region 10c is coated with the resin layer 12c. Therefore, the amount of resin layer used in the roof front end region 10c can be reduced, and the cost increase when the resin-coated steel plate 10 is used in a vehicle can be suppressed. Furthermore, the vehicle inner surface of the steel plate 11 in the vertical wall region 10b and the roof front end region 10c is coated with the resin layer 12d, which is thinner than the resin layer 12b. This makes it possible to ensure the rust prevention of the vehicle inner surface of the steel plate 11 while reducing the amount of resin layer used on the vehicle inner surface of the steel plate 11.

[0039] The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention. In addition, the present invention can be implemented by appropriately combining the above-described embodiment and examples thereof. [Explanation of symbols]

[0040] 100, 100a, 100b, 100d Vehicle roof 10 Resin-coated steel sheet 10a, 110a, 210a Front end of vehicle 10b Vertical wall area 10c Roof front end area 11, 11b, 211c Steel plate 12, 12b, 12c, 12d Resin layer 20 Windshield 30 Side Panel t b Thickness of resin layer 12b t c Thickness of resin layer 12c

Claims

1. A vehicle roof constructed at least in part using a resin-coated steel plate, The resin-coated steel sheet includes a steel sheet and a resin layer coating the steel sheet, The resin-coated steel plate has a vehicle front end portion including a vertical wall region rising upward in the front of the vehicle and a roof front end region extending from the vertical wall region toward the center of the vehicle, The vehicle outer surface of the standing wall region is covered with a first resin layer, The vehicle outer surface of the steel plate in the roof front end region is not covered with a resin layer. Roof for vehicle.

2. The steel plate in the vertical wall region and the steel plate in the roof front end region are formed using a tailored blank material.

2. The vehicle roof according to claim 1.

3. The vehicle inner surface of the steel plate in the vertical wall region is covered with a third resin layer, The first resin layer is thicker than the third resin layer.

3. A vehicle roof according to claim 1 or 2.

4. The vehicle inner surface of the steel plate in the vertical wall region is not covered with a resin layer.

3. A vehicle roof according to claim 1 or 2.

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