Vehicle body structure

Abstract

A vehicle body structure is provided with a vehicle body panel (12) and an interior trim part (14) in which a base material (30), a skin layer (32), and an infrared reflecting layer (38) are laminated, the skin layer (32) being disposed on the vehicle interior side of the base material (30) and forming the exterior surface of the vehicle interior, the infrared reflecting layer (38) constituting the layer closest to the vehicle exterior side of the interior trim part (14) and reflecting infrared light incident from the vehicle body panel (12) side, and the infrared reflecting layer (38) reflecting infrared light incident from the vehicle body panel (12) side. The base material (30) is formed from a thermosetting resin material, and the infrared reflecting layer (38) is configured from a plurality of electrically conductive scale-like metal pieces (40) and a non-conductive resin (42) that holds the scale-like metal pieces (40) in a state of being substantially parallel to each other and stacked in the thickness direction. The interior trim part (14) is attached to the vehicle body panel (12) in a state in which a portion of the infrared reflective layer (38) is in contact with the vehicle body panel (12). As a result, it is possible to provide a vehicle body structure capable of effectively suppressing the effects of electromagnetic noise, static electricity, and the like, in addition to having an infrared reflection function.

Description

Technical Field

[0001] The present technology relates to vehicle body structures. Background Art

[0002] Patent Documents 1 and 2 describe vehicle interior parts that can suppress temperature increases within a vehicle cabin. The vehicle interior parts described in Patent Documents 1 and 2 include a base material, a skin layer disposed on the exterior surface of the base material, and an infrared-reflecting layer disposed on the back surface of the base material. Specifically, Patent Document 1 describes the infrared-reflecting layer, or back surface layer, as consisting of a base material and an infrared-reflecting layer. The base material is composed of a synthetic resin, non-breathable film having a thickness ranging from 0.8 to 25 μm, and the infrared-reflecting layer is composed of an aluminum vapor-deposited film deposited on the base material on the vehicle body panel side. Furthermore, Patent Document 2 describes a radiant heat reflective film that can be used as the infrared-reflecting layer. This radiant heat reflective film comprises a radiant heat reflective layer comprising scaly metal flakes positioned substantially parallel to each other and a resin that prevents contact between the scaly metal flakes.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent No. 5628881

[0006] Patent Document 2: International Publication No. 2019 / 225487 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] On the other hand, vehicles generate electromagnetic noise themselves while driving or receive electromagnetic noise and static electricity from the outside. To suppress the effects of electromagnetic noise, static electricity, etc. on the vehicle, capacitors and ferrite cores are installed near cables and electrical components. The applicant of the aforementioned Patent Document 2, i.e., the applicant of the present application, discovered during research on the infrared (radiant heat) reflective interior trim described in Patent Document 2 that this infrared reflective interior trim can be used to suppress the effects of electromagnetic noise, static electricity, etc. on the vehicle.

[0009] The present technology aims to provide a vehicle body structure that not only has an infrared reflection function but also can effectively suppress the influence of electromagnetic noise, static electricity, etc. on the vehicle.

[0010] Solutions for solving problems

[0011] In order to solve the above problems, the vehicle body structure disclosed in this application is characterized in that:

[0012] The vehicle body structure includes:

[0013] body panels; and

[0014] An interior trim component, comprising a laminated base material, a skin layer, and an infrared reflective layer, and arranged to cover the interior side of the vehicle body panel. The base material is formed of a thermosetting resin material. The skin layer is arranged on the interior side of the base material to form the exterior appearance of the vehicle cabin. The infrared reflective layer is arranged on the exterior side of the base material to face the vehicle body panel and reflects infrared rays incident from the vehicle body panel.

[0015] The infrared reflective layer includes a plurality of conductive flaky metal sheets and a non-conductive resin that holds the flaky metal sheets in a state of being substantially parallel to each other and stacked in the thickness direction.

[0016] The interior trim member is attached to the vehicle body panel in a state in which a portion of the infrared reflective layer is in contact with the vehicle body panel.

[0017] When a vehicle's surface and the surrounding air have the same electrical polarity as the vehicle's, a repulsive force acts between the vehicle and the air. This repulsive force can cause turbulent flow, where air flowing near the vehicle's surface separates from the vehicle's surface. This separation of airflow during driving can prevent the desired aerodynamic characteristics from being achieved, potentially reducing driving stability and performance.

[0018] In the vehicle body structure disclosed in the present application, two parallel flaky metal sheets are held apart by a non-conductive resin in an infrared reflecting layer, thereby achieving a structure similar to a capacitor. That is, the infrared reflecting layer can temporarily store electric charge. In the vehicle body structure disclosed in the present application, the infrared reflecting layer of the interior trim substantially as a whole functions as a capacitor. Furthermore, in the vehicle body structure disclosed in the present application, by partially contacting the infrared reflecting layer with the vehicle body panel, negative or positive electric charge can be stored via the vehicle body panel. This stored electric charge concentrates at the edges of the flaky metal sheets, causing self-discharge (corona discharge). The ions generated by this self-discharge attract ions of different polarity to the surrounding area and are neutralized and eliminated. Therefore, the vehicle body structure disclosed in the present application can reduce the electric charge carried by the vehicle body, stabilize the air flow during vehicle travel, improve driving stability, and improve fuel efficiency. Furthermore, in the vehicle body structure disclosed in the present application, the "body panel" is not limited to metal and can also be a plate made of resin, carbon, glass, etc. For example, depending on the material of the vehicle body panel, the polarity of the charge during driving may be either positive or negative.

[0019] While there are also interior parts that laminate an infrared reflective layer onto a base material formed from a thermoplastic resin, the vehicle body structure disclosed in this application has been found to achieve several times the fuel efficiency improvement compared to vehicle body structures using such interior parts. For interior parts using a base material formed from a thermoplastic resin, during molding, at least the base material and infrared reflective layer are typically heated to a relatively high temperature to soften the thermoplastic resin, followed by cold pressing to form the parts into a predetermined shape. On the other hand, the base material of the interior parts used in the vehicle body structure disclosed in this application uses a thermosetting resin, so during molding, the parts can be formed into a predetermined shape by heating and pressing at a temperature lower than the temperature at which the thermoplastic resin softens. On the other hand, in vehicle body structures using a thermoplastic resin base material, the interior parts are formed by heating the thermoplastic resin at a relatively high temperature and then cold pressing it. Therefore, it is speculated that this molding method is one of the main factors that reduces the capacitor function of the infrared reflective layer.

[0020] In the above configuration, the interior trim may include an infrared reflective film having the infrared reflective layer formed by applying a coating material containing the scaly metal flakes and the non-conductive resin on a base film, and the infrared reflective film may be bonded to the vehicle cabin exterior surface of the base material.

[0021] In this vehicle body structure, the infrared reflective layer is formed on the base film by printing. This vehicle body structure makes it easy to set the area and weight per unit area of the infrared reflective layer. For example, in the case of an electrical component that transmits or receives electromagnetic waves to or from the vehicle interior, as described later, located on the back side of an interior trim component, to ensure reliable transmission or reception of these electromagnetic waves, the infrared reflective layer can have a smaller weight per unit area than the infrared reflective layer in other areas, or no infrared reflective layer can be formed.

[0022] In the above configuration, the infrared reflective film may be bonded to the base material with a thermosetting adhesive.

[0023] When a thermoplastic resin is used as a base material, the thermoplastic resin is sometimes used as an adhesive to bond the infrared reflective film. In the vehicle body structure having the above structure, the adhesion between the infrared film and the base material can be improved compared to when a thermoplastic resin is used as an adhesive.

[0024] In the above configuration, the interior material may include an adhesive layer formed between the base material and the infrared reflective film, the adhesive layer being a mixture of the thermosetting adhesive and glass fiber.

[0025] In the vehicle body structure of this structure, the glass fiber is formed into a mat-shaped adhesive layer. Therefore, the rigidity of the interior trim is high, and the operator can easily handle the interior trim when installing the interior trim on the vehicle body panel.

[0026] In the above configuration, the interior material may include an adhesive layer formed between the base material and the skin layer, the adhesive layer being a mixture of the thermosetting adhesive and glass fiber.

[0027] In this vehicle body structure, the base material is sandwiched between mat-shaped adhesive layers of glass fiber, resulting in higher rigidity for the interior trim.

[0028] In the above structure, it can be set as follows: an electrical component capable of sending or receiving electromagnetic waves is provided between the vehicle body panel and the interior component, and the interior component has an infrared reflecting layer opening portion where the infrared reflecting layer is not formed in the range overlapping with the electrical component in the direction inside and outside the vehicle cabin.

[0029] In the vehicle body structure having this configuration, the electrical components can transmit or receive electromagnetic waves through the openings of the infrared reflective layer, and can reliably transmit or receive electromagnetic waves.

[0030] In the above structure, the base material may be made of a thermosetting resin material.

[0031] In the above configuration, the vehicle body panel may be a roof panel, and the interior trim member may be a ceiling member.

[0032] In the above structure, the base material may be polyurethane foam.

[0033] Effects of the Invention

[0034] According to the present technology, it is possible to provide a vehicle body structure that not only has an infrared reflection function but also can effectively suppress the influence of electromagnetic noise, static electricity, etc. on the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a front view schematically showing a vehicle adopting the vehicle body structure according to the present embodiment.

[0036] Figure 2 yes Figure 1 A top view of the roof trim is shown.

[0037] Figure 3 It is a side cross-sectional view showing the layer structure of the roof trim.

[0038] Figure 4 is a schematic diagram of the infrared reflection layer.

[0039] Figure 5 This is a diagram showing the flow of air around a vehicle body that does not include an infrared reflective layer.

[0040] Figure 6 It is a diagram showing the flow of air around the vehicle body of a vehicle having the vehicle body structure according to the present embodiment.

[0041] Figure 7 This is a schematic diagram of a live voltage measuring device.

[0042] Figure 8 It shows that the interior parts of the embodiment and the interior parts of the comparative example are used Figure 7 The graph is a measurement result obtained by measuring the change of the charged voltage using the charged voltage measuring device shown.

[0043] Figure 9 It is a side cross-sectional view showing the layer structure of an interior trim part of a comparative example.

[0044] Figure 10 The vehicle having the vehicle body structure of this embodiment and the vehicle including Figure 9 The table shows the fuel efficiency improvement rate of vehicles with roof trims having the layer structure shown. DETAILED DESCRIPTION

[0045] Reference Figures 1 to 10 , a vehicle 10 adopting the vehicle body structure 100 of this embodiment will be described. Figure 1 As shown, the vehicle body structure 100 of this embodiment is used for the roof of a vehicle 10 and is composed of a roof panel 12 and a roof trim 14 . The roof panel 12 is a metal body panel, and the roof trim 14 is an interior trim covering the interior side of the vehicle cabin.

[0046] like Figure 2 As shown, the roof trim 14 is formed in a generally flat plate shape. The roof trim 14 is provided with an opening 20 for mounting an interior light, an opening 21 for mounting a reading light, an opening 22 for mounting a sun visor, an opening 23 for mounting a vanity light, and an opening 24 for mounting an auxiliary handle. In addition, a through hole 25 is provided at the rear end portion of the roof trim 14 for a fixing member for fixing the roof trim 14 to the roof panel 12 to pass through. Figure 2 As shown, the roof trim 14 is provided with an opening base 124 and a through-hole base 125 that protrude from its side surface outside the vehicle cabin. The opening 24 is provided on a protruding end surface 124A of the opening base 124, and the through-hole 25 is provided on a protruding end surface 125A of the through-hole base 125. Alternatively, a configuration may be employed in which the opening edge 24A of the opening 24 and the hole edge 25A of the through-hole 25 protrude slightly toward the vehicle cabin outside relative to the protruding end surfaces 124A and 125A.

[0047] The roof trim 14 mainly includes a base material 30, a skin material 32 bonded to the inner side (lower side) of the base material 30, and an infrared reflective film 34 bonded to the outer side (upper side) of the base material 30. Figure 3 The layer structure shown is shown. The base material 30 forms the main body of the roof trim 14 and is formed from a thermosetting resin. In this embodiment, the base material 30 is a semi-rigid polyurethane foam (polyurethane foam). The surface material (skin layer) 32 can be made of materials conventionally used for interior trim, such as embossed or leather-finished synthetic resin sheets, knitted fabrics, woven fabrics, nonwoven fabrics, and laminates thereof.

[0048] The infrared reflective film 34 is used to reflect radiant heat from the roof panel 12 and suppress temperature increases in the vehicle cabin. It is composed of a base film 36 and an infrared reflective layer 38 coated on the base film 36 and having an infrared reflective function. The base film 36 is made of a thermoplastic resin. Examples of such thermoplastic resins include polyester resins such as polyethylene terephthalate and polybutylene terephthalate; polyamide resins such as nylon 6, nylon 66, and terpolymers of nylon 6 and nylon 66; polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins; cellulose resins such as triacetyl cellulose; polyimide resins; polycarbonate resins; acrylic resins; polyvinyl alcohol resins; and ethylene-vinyl alcohol copolymers.

[0049] However, the resin used for the base film 36 is preferably one that does not melt when heated during the molding of the roof trim 14. Examples of such resins include amide resins such as nylon 6, nylon 66, nylon 6 / 10, nylon 11, and nylon 12, copolymers of these resins, and polyester resins such as polyethylene terephthalate and polybutylene terephthalate. Furthermore, the base film 36 can be either a stretched or unstretched film. Unstretched film is more effective because it combines heat resistance and flexibility, preventing cracking during molding of the roof trim 14. Considering this, in this embodiment, the base film 36 is an unstretched nylon film. Alternatively, an unstretched polypropylene film is also suitable for the base film 36.

[0050] The infrared reflective layer 38 is formed by coating a paint containing flaky metal flakes on the base film 36. In other words, the infrared reflective layer 38 is formed by printing. Figure 4 In general, the infrared reflective layer 38 comprises a large number of flaky metal flakes (scaly metal flakes) 40 and a resin layer 42 that holds the flaky metal flakes 40 in a discretely dispersed state. The flaky metal flakes 40 are held by the resin layer 42 in a state where they are substantially parallel to each other and stacked in the thickness direction.

[0051] The flaky metal flake-containing paint comprises, for example, a metal flake pigment such as aluminum, gold, silver, indium, or copper, and a resin forming the resin layer 42. In this embodiment, the metal flake pigment is a floating aluminum flake pigment. The flaky metal flakes 40 contained in the metal flake pigment are obtained by coating flaky aluminum powder with a long diameter of 1 μm to 150 μm with a treatment agent such as stearic acid. When the flaky metal flake-containing paint comprising the metal flake pigment and the resin forming the resin layer 42 is applied to the base film 36, the flaky metal flakes 40 float on the coating surface and are arranged in parallel. The flaky metal flakes are then held in place by the resin layer 42, overlapping and substantially parallel to each other, forming the infrared reflective layer 38.

[0052] The resin constituting the resin layer 42 of the flaky metal flake-containing coating material is a non-conductive resin (hereinafter sometimes referred to as a non-conductive resin). Examples of the resin include alkyd resins, acrylic resins, epoxy resins, olefin resins, polyamide resins, polyurethane resins, polyester resins, polybutadiene resins, and modified forms of these resins. In this embodiment, the resin constituting the resin layer 42 is a polyurethane resin.

[0053] The content of the flaky metal flakes 40 in the infrared reflective layer 38 is preferably 0.1 g / m 2 Above and 5.0g / m 2 Below. The content of the flaky metal flakes 40 is less than 0.1 g / m 2 In the case of the infrared reflection function is not sufficient, if the content of the flaky metal flakes 40 exceeds 5.0g / m 2 , the infrared reflection effect is saturated, which may lead to cost increase. In addition, the content of the flaky metal flakes 40 is more preferably 0.3g / m 2 Above and 3.0g / m 2 Below, more preferably 0.5g / m 2 Above and 1.0g / m 2 the following.

[0054] Furthermore, it is preferable to add a curing agent to the flaky metal flake-containing coating. Specifically, a combination of adding an isocyanate compound curing agent to the polyurethane resin (i.e., the non-conductive resin) constituting the resin layer 42 is particularly preferred. This combination provides a cross-linked structure in the resulting coating film, improving the coating film's heat resistance. Consequently, even when heating and pressurizing the roof trim 14 during molding, peeling of the coating film can be suppressed.

[0055] The infrared reflective film 34 can suppress temperature increases in the vehicle cabin by reflecting radiant heat from the roof panel 12. Specifically, the infrared reflective film 34 increases the reflectivity of infrared light in the wavelength range of 2 μm to 20 μm, which includes the wavelength range corresponding to radiant heat, and can effectively reflect radiant heat.

[0056] The surface member 32 and the infrared reflective film 34 are bonded to the base material 30. Figure 3 As shown, the roof trim 14 has adhesive layers 50, 52 formed between the surface member 32 and the base material 30, and between the base material 30 and the infrared reflective film 34. The adhesive layers 50, 52 are composed of a thermosetting resin adhesive and a fiber material. Specifically, the adhesive layers 50, 52 are composed of MDI (diphenylmethane diisocyanate) as a thermosetting resin adhesive and glass fiber, resulting in a structure in which MDI is impregnated in the glass fiber to form a mat-shaped glass mat. As described above, the roof trim 14 has a structure in which the base material 30 is sandwiched between the adhesive layers 50, 52 containing the glass mat, thereby improving the rigidity. As a result, during the installation operation of the roof trim 14 on the roof panel 12, the operator can easily handle the roof trim 14.

[0057] In the roof trim 14, as described above, the infrared reflecting layer 38 of the infrared reflecting film 34 forms the layer closest to the outside (upper side) of the vehicle cabin, and the roof trim 14 is arranged so that the infrared reflecting layer 38 faces the roof panel 12. When the roof trim 14 is mounted on the roof panel 12, the periphery of the opening 22 for mounting the sun visor, the opening base 124 provided with the opening 24 for mounting the auxiliary handle, and the through-hole base 125 provided with the through-hole 25 (schematically shown in FIG. Figure 1 ) is in contact with the roof panel 12. In this embodiment, the opening base portion having the opening 22 is not shown. The protruding end surface 124A of the opening base portion 124 of the roof trim 14 and the protruding end surface 125A of the insertion hole base portion 125 are in contact with the roof panel 12 (see FIG. Figure 1 ). That is, the infrared reflecting layer 38 at the protruding end surfaces 124A and 125A is in contact with the roof panel 12. In the structure in which the opening edge 24A and the hole edge 25A are protruding, the opening edge 24A and the hole edge 25A are in contact with the roof panel 12. By the way, in the past, there were interior parts in which a metal film of a predetermined film thickness was formed by evaporating a metal such as aluminum as a metal, but in order to protect the metal, the surface of the metal film was covered with a protective layer made of a non-conductive resin. That is, in the previous vehicle body structure, the infrared reflecting layer of the interior part and the vehicle body panel were not connected. In contrast, the vehicle body structure 100 of the present embodiment has a structure in which the infrared reflecting layer 38 is connected to the roof panel 12.

[0058] Sometimes the air flowing around the body of a moving vehicle has a negative or positive charge, in other words, Figure 5As shown in FIG. 1 , sometimes there are more negative or positive charges (ions) 54 around a moving vehicle. In addition, the vehicle body is charged with negative or positive electricity due to static electricity generated during driving. When the vehicle is running, the body and the air around it have the same polarity of electricity, which easily generates repulsion between the surface of the vehicle body and the air. In other words, as Figure 5 As shown, the airflow near the vehicle body surface has turbulent flow areas 90A and 90B, where the airflow is separated from the vehicle body surface. Due to this separation of the airflow during vehicle travel, the target aerodynamic characteristics cannot be achieved, and driving stability and driving performance may be reduced.

[0059] On the other hand, in the vehicle body structure 100 of the present embodiment, in the infrared reflecting layer 38 of the roof trim 14, as shown in FIG. Figure 4 As shown, two parallel, scale-like metal sheets 40 are held apart by a resin layer 42 made of a non-conductive resin, thereby achieving a structure similar to a capacitor. In other words, the roof trim 14 can temporarily store charge in the infrared reflective layer 38. In the vehicle body structure 100 of this embodiment, the infrared reflective layer 38 of the roof trim 14 as a whole functions as a capacitor.

[0060] Furthermore, in the vehicle body structure 100 of the present embodiment, as described above, a portion of the infrared reflecting layer 38 is in direct contact with the roof panel 12, so the infrared reflecting layer 38 can accumulate the negative or positive charge carried by the roof panel 12 via the roof panel 12. The accumulated charge tends to concentrate on the edge portions of each scaly metal sheet 40, generating self-discharge (corona discharge). The negative ions or positive ions generated by the self-discharge attract ions of different polarity to the surroundings and are neutralized and eliminated. Therefore, the vehicle body structure 100 of the present embodiment can reduce the charge carried by the roof panel 12, such as Figure 6 As shown, the air flow during vehicle travel can be stabilized to improve travel stability. In addition, fuel efficiency can also be improved, which will be described in detail later.

[0061] The electrical charge test of the roof trim 14 of the vehicle body structure 100 of this embodiment was conducted. The test method used the electrical charge test method for woven and knitted fabrics (JIS L1094). Figure 7The charged voltage measuring device 60 shown. The charged voltage measuring device 60 includes a rotating table 62 that can carry a sample 61 and rotate around an axis, a charged electrode 63 for applying voltage to the rotating table 62, and a receiver (synchronous oscilloscope) 64 for measuring the charged voltage of the sample 61. First, the sample 61 is placed on the rotating table 62 of the charged voltage measuring device 60, and a voltage (applied voltage: 7.5 kV) is applied for 30 seconds using the charged electrode 63 while the rotating table 62 is rotated, so that the sample 61 is charged. Then, the voltage application is stopped, and the change in the charged voltage of the sample 61 is measured while the rotating table 62 is rotated.

[0062] As a sample 61, an interior trim having the same layer structure as the roof trim 14 of the vehicle body structure 100 of the present embodiment (Example: see Figure 3 ) and a conventional interior trim with a layer structure not including an infrared reflective layer (comparative example). Sample 61 was placed with the vehicle cabin exterior side facing upwards and tested. In other words, a sample of an embodiment with the same layer structure as the roof trim 14 was placed with the infrared reflective layer 38 facing upwards and tested. Figure 8 As shown, it can be seen that the interior material of the comparative example cannot release a portion of the stored charge and remains charged, whereas the interior material of the example can release all of the stored charge.

[0063] <Effects of this vehicle's body structure>

[0064] Next, the fuel efficiency improvement effect of the vehicle 10 having the vehicle body structure 100 of the present embodiment is verified by the following method. Vehicles equipped with different roof parts are caused to circle the test site under the same conditions (speed, acceleration, etc.), and the average fuel efficiency at this time is measured. In addition, the increase rate of the fuel efficiency of the vehicle of the embodiment relative to the vehicle of the comparative example (fuel efficiency increase rate) is measured. The vehicle of the comparative example is equipped with a roof decoration of a layer structure that has been used in the past but does not include an infrared reflection layer. The vehicle 10 of the embodiment is equipped with the roof decoration 14 of the vehicle body structure 100 of the present embodiment. In addition, the vehicle 10 of the embodiment does not include a sunroof. In addition, the fuel efficiency increase rate of the vehicle of Comparative Example 1 and the vehicle of Comparative Example 2 relative to the vehicle of the comparative example is also measured. The vehicle of Comparative Example 1 and the vehicle of Comparative Example 2 above adopt the method of using ... of Comparative Example 1 and the vehicle of Comparative Example 2 adopt the method of using the roof decoration 14 of the vehicle body structure 100 of the present embodiment. In addition, the vehicle of Comparative Example 1 and the vehicle of Comparative Example 2 adopt the method of using the roof decoration 14 of the vehicle body structure 100 of the present embodiment. In addition, the vehicle of Comparative Example 1 and the vehicle of Comparative Example 2 adopt the method of using the roof decoration 14 of the vehicle body structure 100 of Figure 9 A layered roof trim 70 is shown in FIG. 1 , and the roof trim 70 will be described first.

[0065] The roof trim 70 has a similar structure to the roof trim 14 of the present embodiment, including a skin member 32 and an infrared reflective film 34. However, unlike the polyurethane foam composed of a thermosetting resin like the roof trim 14, the base material 72 is primarily composed of a thermoplastic resin, polypropylene resin (PP resin), with glass fiber and a foaming material uniformly mixed. Furthermore, adhesive layers 74 and 76 are provided between the base material 72 and the skin member 32, and between the base material 72 and the infrared reflective film 34. These adhesive layers 74 and 76 are made of PP resin. Furthermore, while the roof trim 14 of the present embodiment is formed by stacking all layers and heating and pressing the stack at approximately 130°C, the roof trims 70 of Comparative Examples 1 and 2 are formed by stacking all layers, preheating the stack at 200°C, and then cold-pressing (at approximately 20°C).

[0066] The vehicle of Comparative Example 1 includes a sunroof, while the vehicle of Comparative Example 2 does not have a sunroof, similar to vehicle 10 of the embodiment. Furthermore, the rate of increase in fuel efficiency of the vehicles of Comparative Example 1 and Comparative Example 2 relative to the fuel efficiency of a comparative example vehicle equipped with a conventional roof trim having a layer structure that does not include an infrared reflective layer was also measured.

[0067] The vehicle 10 of the embodiment and the vehicles of Comparative Examples 1 and 2 include an infrared reflective layer 38 in which the scaly metal flakes 40 are oriented and the infrared reflective layer 38 is in contact with the roof panel 12. Figure 10 As shown, fuel efficiency is improved compared to the comparative example vehicle without an infrared reflective layer. Furthermore, the fuel efficiency improvement rate for the comparative example 1 vehicle with a sunroof is 3.0%, while the fuel efficiency improvement rate for the comparative example 2 vehicle without a sunroof is 5.2%. In other words, it is speculated that a larger area of the roof trim can reduce the positive charge on the roof panel 12, thereby improving fuel efficiency.

[0068] Furthermore, it can be seen that the fuel efficiency improvement rate of vehicle 10 of Example 1 is 7.5%, which is higher than the fuel efficiency improvement rate (5.2%) of the vehicle of Comparative Example 2, which lacks a sunroof and uses a base material 72 primarily composed of thermoplastic resin. Because the roof trim 70 uses a thermoplastic resin as its base material 72, it is heated at a relatively high temperature (200°C) and then cold-pressed during molding. This molding method is presumably one of the main factors that reduces the capacitor function of the infrared reflective layer 38 of the infrared reflective film 34, and it is not believed that the fuel efficiency improvement rate has increased.

[0069] As described above, in the present embodiment, the vehicle 10 includes the vehicle body structure 100 which, in addition to having an infrared reflection function, can effectively suppress the influence of electromagnetic noise, static electricity, and the like on the vehicle 10 .

[0070] In addition, if Figure 1 、 Figure 3 As shown, the vehicle 10 having the vehicle body structure 100 of the present embodiment sometimes has an electrical component that transmits and receives electromagnetic waves, such as a human sensing sensor 80 for detecting passengers, disposed between the roof panel 12 and the roof decoration 14. In the case of disposing an electrical component such as such a human sensing sensor 80, if a metal film is formed by vapor deposition on the interior trim, there are problems such as the interior trim being unable to transmit electromagnetic waves and the electrical component being unable to transmit and receive electromagnetic waves. However, in the vehicle body structure 100 of the present embodiment, flaky metal flakes 40 are dispersedly disposed in the infrared reflective layer 38, so that the roof decoration 14 can be constructed to transmit electromagnetic waves. For example, in the range of the infrared reflective layer 38 that overlaps with the electrical component, by providing a structure that reduces the content of the flaky metal flakes 40, it is possible to effectively transmit electromagnetic waves. In the vehicle body structure 100 of the present embodiment, as Figure 3 As shown, the portion of the infrared reflective film 34 that overlaps with the human sensor 80 is provided with an infrared reflective layer opening 34A. In other words, the portion of the infrared reflective film 34 that overlaps with the human sensor 80 is not provided with the infrared reflective layer 38. This structure enables the human sensor 80 to reliably transmit and receive electromagnetic waves. Furthermore, in the vehicle body structure 100 of this embodiment, the infrared reflective film 34 is formed by printing the infrared reflective layer 38 on the base film 36. Therefore, the infrared reflective layer opening 34A can be easily formed at the appropriate location simply by setting the printing range.

[0071] Moreover, if Figure 2As shown, in the vehicle body structure 100 of the present embodiment, a mark 14A indicating the wiring position, text indicating the material, etc. is applied to the outer side surface of the roof decoration 14 (the surface on the side of the infrared reflective layer 38). The mark 14A is formed into a groove shape by using a forming mold frame with a convex portion during heat pressing. In other words, the portion of the roof decoration 14 where the mark 14A is formed needs to be thinner than other parts. Therefore, when applying a mark to a roof decoration without an infrared reflective film 34, it is necessary to make the base material concave, so a relatively deep groove is required. The thickness of the roof decoration becomes thinner near the outer edge, and when applying a mark near the outer edge, the depth of the mark becomes larger relative to the overall thickness of the roof decoration. In such a case, it is possible that unevenness will occur on the exterior surface. In contrast, in the vehicle body structure 100 of the present embodiment, even if the grooves provided in the infrared reflective film 34 are shallower than the recesses provided in the base material, the visibility of the marking 14A is high, and the range in which the marking can be applied can be expanded.

[0072] Furthermore, this technology is not limited to the above-described embodiment and can be implemented with various modifications and improvements based on the knowledge of those skilled in the art. For example, the vehicle body structure 100 of the above-described embodiment is employed on the roof of the vehicle 10, but is not limited to this location. It can also be employed in structures including sidewalls of the vehicle, such as pillars and side doors. Furthermore, in the above-described embodiment, the roof panel 12, serving as a vehicle body panel, is made of metal, but this is not limited to this and can also be a sheet material such as resin, carbon, or glass.

[0073] Description of Reference Numerals

[0074] 10. Vehicle; 12. Roof panel (body panel); 14. Roof trim (interior trim); 30. Base material; 32. Surface member (surface layer); 34. Infrared reflective film; 34A. Infrared reflective layer opening; 36. Base film; 38. Infrared reflective layer; 40. Scaly metal sheet (scaly metal sheet); 42. Non-conductive resin; 50, 52. Adhesive layer; 80. Human sensor (electrical component); 100. Vehicle body structure.

Claims

1. A vehicle body structure, wherein: The vehicle body structure includes: body panels; and An interior trim component, comprising a laminated base material, a skin layer, and an infrared reflective layer, and arranged to cover the interior side of the vehicle body panel. The base material is formed of a thermosetting resin material. The skin layer is arranged on the interior side of the base material to form the exterior appearance of the vehicle cabin. The infrared reflective layer is arranged on the exterior side of the base material to face the vehicle body panel and reflects infrared rays incident from the vehicle body panel. The infrared reflective layer includes a plurality of conductive flaky metal sheets and a non-conductive resin that holds the flaky metal sheets in a state of being substantially parallel to each other and stacked in the thickness direction. The interior trim member is attached to the vehicle body panel in a state in which a portion of the infrared reflective layer is in contact with the vehicle body panel.

2. The vehicle body structure according to claim 1, wherein: The interior trim part includes an infrared reflective film in which the infrared reflective layer is formed by applying a coating material containing the flaky metal sheet and the non-conductive resin on a base film. The infrared reflective film is adhered to the vehicle compartment outer surface of the substrate.

3. The vehicle body structure according to claim 2, wherein: The infrared reflective film is bonded to the base material using a thermosetting resin adhesive.

4. The vehicle body structure according to claim 3, wherein: The interior trim part has an adhesive layer formed between the base material and the infrared reflective film, the adhesive layer being a mixture of the thermosetting resin adhesive and glass fiber.

5. The vehicle body structure according to claim 4, wherein: The interior trim part has an adhesive layer formed between the base material and the skin layer, wherein the adhesive layer is a mixture of the thermosetting resin adhesive and glass fiber.

6. The vehicle body structure according to any one of claims 1 to 5, wherein: An electrical component capable of transmitting or receiving electromagnetic waves is provided between the vehicle body panel and the interior trim. The interior trim has an infrared reflecting layer opening where the infrared reflecting layer is not formed, in a range overlapping with the electrical component in a vehicle interior-exterior direction.

7. The vehicle body structure according to any one of claims 1 to 5, wherein: The substrate is made of thermosetting resin material.

8. The vehicle body structure according to any one of claims 1 to 5, wherein: The vehicle body panel is a roof panel, and the interior trim member is a ceiling member.

9. The vehicle body structure according to claim 7, wherein: The substrate is polyurethane foam.

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