Outer panel for vehicle and vehicle hood

Abstract

To provide an outer panel of a vehicle and a hood for a vehicle which improve rust-prevention at boundary face between a vehicle inner side surface and a reinforcement member.SOLUTION: An outer panel 10 of a vehicle covering inside of the vehicle comprises: a steel plate 1a having an outer panel shape for the vehicle; a reinforcement member 2 which is arranged on a vehicle inner side surface of the steel plate 1a to reinforce the steel plate 1a; and a first resin layer 1b which coats the vehicle inner side surface of the steel plate 1a. A reinforcement member 2 is not coated by the resin layer. The outer panel 10 of the vehicle is configured so that the first resin layer 1b coats the vehicle inner side surface of the steel plate 1a to improve rust-prevention at boundary face between the vehicle inner side surface and the reinforcement member 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an outer panel for a vehicle and a vehicle hood, and particularly to an outer panel for a vehicle and a vehicle hood using a resin-coated steel sheet.

Background Art

[0002] Patent Document 1 discloses, as an example of an automotive part using a resin-coated steel sheet, a door, a bonnet, and an engine hood. These are also specific examples to which an outer panel for a vehicle is applied.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present application have found the following problems. In many cases, an outer panel for a vehicle includes a steel sheet and a reinforcing member. The steel sheet has the shape of the outer panel for a vehicle. The reinforcing member reinforces the steel sheet. The reinforcing member is provided on the inner side of the vehicle of the steel sheet. The reinforcing member and the steel sheet are often adhered to each other via a mastic adhesive. There is no coating at the interface between the inner surface of the vehicle of the steel sheet and the reinforcing member, which is a weak point in terms of rust prevention.

[0005] In view of the above-described problems, an object of the present invention is to provide an outer panel for a vehicle and a vehicle hood having improved rust prevention at the interface between the inner surface of the vehicle and the reinforcing member.

Means for Solving the Problems

[0006] An outer panel for a vehicle according to one aspect of the present invention is an outer panel for a vehicle that covers the interior of the vehicle, A steel sheet having the shape of an outer panel for a vehicle, a reinforcing member provided on the inner surface of the vehicle of the steel sheet for reinforcing the steel sheet, and a first resin layer covering the inner surface of the vehicle of the steel sheet, wherein the reinforcing member is not covered by the resin layer.

[0007] According to such a configuration, since the first resin layer covers the inner surface of the vehicle of the steel sheet, the rust prevention property at the interface between the inner surface of the vehicle and the reinforcing member is enhanced.

[0008] Further, it may be characterized in that a mastic adhesive is provided between the steel sheet and the reinforcing member.

[0009] According to such a configuration, since the first resin layer covers the inner surface of the vehicle of the steel sheet, the rust prevention property between the mastic adhesive and the steel sheet is enhanced. Further, since the steel sheet and the reinforcing member are joined using the mastic adhesive, there is no need to use thermal welding. The influence on the design of the outer panel for a vehicle due to thermal welding can be avoided, and a decrease in the design of the outer panel for a vehicle can be suppressed.

[0010] Further, it may be characterized in that the outer surface of the steel sheet is not covered by the resin layer.

[0011] According to such a configuration, the outer surface of the steel sheet is not covered by the resin layer. Therefore, while suppressing the amount of the resin layer used, the rust prevention property between the reinforcing member and the steel sheet can be ensured, so that cost reduction can be achieved.

[0012] Further, a second resin layer covering the outer surface of the steel sheet is provided, and the first resin layer may be characterized in that it is thicker than the second resin layer.

[0013] According to such a configuration, the first resin layer covers the inner surface of the steel plate on the vehicle side, and the second resin layer covers the outer surface of the steel plate. Therefore, in addition to between the reinforcing member and the steel plate, rust prevention can be ensured for the outer surface of the steel plate. Further, since the second resin layer is thinner than the first resin layer, the amount of resin layer used can be suppressed. Thus, cost reduction can be achieved.

[0014] The vehicle hood according to one aspect of the present invention applies the above-described outer panel for a vehicle.

[0015] According to such a configuration, the rust prevention property at the interface between the engine room side surface of the vehicle hood and the reinforcing member can be enhanced.

Advantages of the Invention

[0016] The present invention can provide an outer panel for a vehicle and a vehicle hood with enhanced rust prevention property at the interface between the inner surface of the vehicle and the reinforcing member.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[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. Also, for clarity of explanation, the following description and drawings are simplified as appropriate.

[0019] (Embodiment 1) Embodiment 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing the inner surface of a vehicle of an example of an outer panel for a vehicle according to Embodiment 1. FIG. 2 is a schematic cross-sectional view of a main part of an example of the outer panel for a vehicle shown in FIG. 1.

[0020] Of course, the right-handed XYZ coordinates shown in FIG. 1 and other drawings are for convenience in explaining the positional relationship of the components. Usually, the positive Z-axis direction is vertically upward, the XY plane is a horizontal plane, and is common among the drawings. Also, the positive Z-axis direction is the outside of the vehicle, and the negative Z-axis direction is the inside of the vehicle.

[0021] As shown in FIG. 1, the outer panel 10 for a vehicle includes a resin-coated steel sheet 1 and a reinforcing member 2. The outer panel 10 for a vehicle may cover the inside of the vehicle. The outer panel 10 for a vehicle can be applied to, for example, a vehicle hood, roof, or door. When the outer panel 10 for a vehicle is applied to a vehicle hood, it covers the engine room inside the vehicle. Also, when the outer panel 10 for a vehicle is applied to a roof or door, it covers the passenger compartment inside the vehicle.

[0022] An example of the resin-coated steel sheet 1 shown in FIG. 1 is a substantially rectangular plate, but the resin-coated steel sheet 1 may have, for example, a vehicle hood shape, roof shape, or door shape.

[0023] As shown in FIG. 2, the resin-coated steel sheet 1 includes a steel sheet 1a and a first resin layer 1b.

[0024] The steel sheet 1a has the shape of an outer panel for a vehicle. Also, the steel sheet 1a has the mechanical properties necessary for an outer panel for a vehicle. The steel sheet 1a may have an appropriate thickness so that the resin-coated steel sheet 1 can ensure the required rigidity as an outer panel for a vehicle. Further, when the steel sheet 1a has an appropriate thickness and the resin-coated steel sheet 1 ensures the required rigidity as an outer panel for a vehicle, it may not be necessary to use the mastic adhesive 3 described later. Specifically, the steel sheet 1a is preferably made of ordinary steel or steel containing additive elements such as chromium. Also, a plating film may be provided on the surface of the steel sheet 1a. The type of the plating film on the surface of the steel sheet 1a 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 further other metal elements and non-metal elements. Also, depending on the application, both sides, only one side, a part of the surface, or the entire surface of the metal plate may be coated with a coating film.

[0025] The first resin layer 1b covers the inner surface of the steel sheet 1a on the vehicle side. The first resin layer 1b contains a resin and has higher rust prevention properties compared to the steel sheet 1a. By these, the first resin layer 1b enhances the rust prevention properties of the steel sheet 1a. Such a resin is, for example, an organic resin such as an aqueous coating composition or an organic solvent-based coating composition. For the purpose of further improving the adhesion and corrosion resistance of the first resin layer 1b to the steel sheet 1a, etc., an undercoat film may be provided between the first resin layer 1b and the surface of the steel sheet 1a. When providing such an undercoat film in this way, the number of layers and the composition of the undercoat film are not limited. The first resin layer 1b may further contain a pigment. Such a pigment is, for example, a rust prevention pigment or a conductive pigment. The type of the rust prevention pigment and the type of the conductive pigment are not particularly limited, but the rust prevention pigment preferably contains one or more selected from, for example, silicate compounds, phosphate compounds, vanadate compounds, and metal oxide fine particles. Also, the conductive pigment preferably contains one or more selected from, for example, metals, alloys, conductive carbon, iron phosphide, carbides, and semiconductor oxides.

[0026] Note that the resin-coated steel sheet 1 may include at least one of an electrodeposition coating film layer, an intermediate coating film layer, and a top coating film layer. At least one of such an electrodeposition coating film layer, an intermediate coating film layer, and a top coating film layer covers at least a part of the first resin layer 1b.

[0027] The reinforcing member 2 is provided on the inner surface of the steel sheet 1a on the vehicle side. The reinforcing member 2 may be any member that reinforces the steel sheet 1a. An example of the reinforcing member 2 shown in FIG. 1 has a shape extending in a substantially cross shape, but the reinforcing member 2 can take various other shapes. The reinforcing member 2 is not covered with a resin layer. As shown in FIG. 2, the reinforcing member 2 may have a wedge-shaped cross section.

[0028] Note that the reinforcing member 2 and the steel sheet 1a may be joined using thermal welding. Such thermal welding is, for example, spot welding.

[0029] As described above, according to the configuration of the vehicle outer panel 10, since the first resin layer 1b covers the inner surface of the steel sheet 1a on the vehicle side, the reinforcing member 2 and the steel sheet 1a are in contact with each other via the first resin layer 1b. The presence of the first resin layer 1b on the steel sheet 1a enhances the rust prevention property of the mating surface between the reinforcing member 2 and the steel sheet 1a.

[0030] Further, according to the configuration of the vehicle outer panel 10 according to the present embodiment, the outer surface of the steel sheet 1a is not covered with a resin layer. Thereby, the amount of the resin layer used can be suppressed. That is, since the rust prevention property between the reinforcing member and the steel sheet can be ensured while suppressing the amount of the resin layer used, cost reduction can be achieved.

[0031] Next, an example of a method for manufacturing the outer panel 10 for a vehicle will be described. First, a coating film is applied onto the inner surface of the steel plate 1a of the vehicle to form the first resin layer 1b on the steel plate 1a. Subsequently, the steel plate 1a on which the first resin layer 1b is formed is processed or molded into the shape of the component to which the outer panel 10 for a vehicle is applied. The reinforcing member 2 is installed on the inner surface of the processed or molded steel plate 1a of the vehicle. Thus, the outer panel 10 for a vehicle can be manufactured. Optionally, further, at least one of electrodeposition coating, intermediate coating, and top coating may be applied to the steel plate 1a on which the reinforcing member 2 is installed.

[0032] (One modification example) Next, with reference to FIG. 3, one modification example of the outer panel 10 for a vehicle will be described. FIG. 3 is a schematic cross-sectional view of the main part of one modification example of the outer panel for a vehicle shown in FIG. 1.

[0033] The outer panel 10a for a vehicle shown in FIG. 3 is one modification example of the outer panel 10 for a vehicle shown in FIGS. 1 and 2. The outer panel 10a for a vehicle has the same configuration as the outer panel 10 for a vehicle, except that it includes a mastic adhesive 3 and a second resin layer 1c.

[0034] As shown in FIG. 3, the outer panel 10a for a vehicle includes a mastic adhesive 3 and a second resin layer 1c.

[0035] The mastic adhesive 3 is provided between the steel plate 1a and the reinforcing member 2. It is preferable that the mastic adhesive 3 joins the steel plate 1a and the reinforcing member 2. The joining method using the mastic adhesive 3 has less influence on the design of the outer panel 10 for a vehicle compared to the joining method by thermal welding. When the steel plate 1a and the reinforcing member 2 are joined using the joining method by thermal welding, the indentations and surface deformations of spot welding may affect the design surface. On the other hand, even when the steel plate 1a and the reinforcing member 2 are joined using the joining method by the mastic adhesive 3, since there is no need to perform spot welding, there is almost no influence on the design surface of the indentations and surface deformations of spot welding. Different from the joining method by thermal welding, the joining method by the mastic adhesive 3 can avoid the influence on the design of the outer panel 10 for a vehicle.

[0036] As shown in FIG. 3, when the reinforcing member 2 has a wedge-shaped cross section, the reinforcing member 2 and the steel plate 1a firmly sandwich and hold the mastic adhesive 3. Thereby, the position of the mastic adhesive 3 is stabilized. Further, the steel plate 1a may have a portion that protrudes outward of the vehicle.

[0037] The second resin layer 1c covers the outer surface of the steel plate 1a. The first resin layer 1b is thicker than the second resin layer 1c. In other words, the thickness t 1b of the first resin layer 1b 1c is larger than the thickness t

[0038] of the second resin layer 1c. Therefore, the inner surface of the steel plate 1a is protected by the first resin layer 1b having a larger thickness as compared with the second resin layer 1c on the outer surface of the steel plate 1a. Thereby, the rust prevention property of the inner surface of the steel plate 1a can be enhanced. The second resin layer 1c may have the same configuration as the first resin layer 1b.

[0039] Further, according to the configuration of the vehicle outer panel 10a, when the reinforcing member 2 has a wedge-shaped cross section, the reinforcing member 2 and the steel plate 1a firmly sandwich and hold the mastic adhesive 3. Thereby, the position of the mastic adhesive 3 is stabilized. On the other hand, in such a case, the reinforcing member 2 may hold water depending on the usage environment of the vehicle (not shown) equipped with the vehicle outer panel 10a. Even when the reinforcing member 2 holds water in this way, as described above, since the first resin layer 1b covers the inner surface of the steel plate 1a on the vehicle side, the inner surface of the steel plate 1a on the vehicle side can be protected from the water held by the reinforcing member 2. Therefore, the rust prevention property of the steel plate 1a is enhanced.

[0040] Note that the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit thereof. Further, the present invention may be implemented by appropriately combining the above-described embodiments and examples thereof.

Explanation of Reference Numerals

[0041] 10, 10a Outer panel for vehicle 1 Resin-coated steel sheet 1a Steel sheet 1b First resin layer 1c Second resin layer 2 Reinforcing member 3 Mastic adhesive t 1b Thickness t of the first resin layer 1b 1c Thickness of the second resin layer 1c

Claims

1. An outer panel for a vehicle that covers the interior of the vehicle, a steel plate having the shape of an outer panel for a vehicle, a reinforcing member provided on the inner surface of the vehicle of the steel plate to reinforce the steel plate, and a first resin layer that covers the inner surface of the vehicle of the steel plate, and is provided, the reinforcing member is not covered by the resin layer, a mastic adhesive is provided between the steel plate and the reinforcing member, an outer panel for a vehicle.

2. The outer surface of the steel plate is not covered by a resin layer, The outer panel for a vehicle according to claim 1, characterized in that.

3. An outer panel for a vehicle that covers the interior of the vehicle, a steel plate having the shape of an outer panel for a vehicle, a reinforcing member provided on the inner surface of the vehicle of the steel plate to reinforce the steel plate, a first resin layer that covers the inner surface of the vehicle of the steel plate, and a second resin layer that covers the outer surface of the steel plate, and is provided, the reinforcing member is not covered by the resin layer, the first resin layer is thicker than the second resin layer, an outer panel for a vehicle.

4. A vehicle hood to which the outer panel for a vehicle according to any one of claims 1 to 3 is applied.

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