Windshield connection structure

Abstract

The present invention is provided with a windshield (12), a vehicle body panel (13), and a heat conductor (14). One surface of the vehicle body panel (13) faces the outside of the vehicle. The heat conductor (14) has a higher thermal conductivity than the vehicle body panel (13) and is in contact with both the windshield (12) and the vehicle body panel (13).

Description

Windshield connection structure

[0001] The present invention relates to a windshield connection structure.

[0002] In the attachment structure of laminated glass disclosed in Patent Document 1, the laminated glass and the vehicle body panel are fixed, and the gap between the two is sealed with a resin molding such as rubber.

[0003] Japanese Patent Application Laid-Open No. 2001-239958

[0004] Since a resin molding such as rubber has a low thermal conductivity, when the temperature of the windshield rises due to sunlight, heat transfer to the vehicle body panel is unlikely to occur, and the temperature inside the vehicle cabin is likely to rise due to heat radiation from the windshield. An object of the present invention is to suppress heat radiation from the windshield into the vehicle cabin.

[0005] The windshield connection structure according to one aspect of the present invention includes a windshield, a vehicle body panel, and a heat conductor. One surface of the vehicle body panel faces the outside of the vehicle. The heat conductor contacts both the windshield and the vehicle body panel and has a higher thermal conductivity than the vehicle body panel.

[0006] According to the present invention, heat transfer occurs from the windshield to the vehicle body panel through the heat conductor, and radiative cooling occurs in the vehicle body panel. Therefore, an increase in the temperature of the windshield can be suppressed, and heat radiation into the vehicle cabin can be suppressed.

[0007] It is a diagram showing the windshield connection structure of the first embodiment. It is a diagram showing the vehicle body panel. It is a diagram showing the windshield. It is a diagram showing an example. It is a diagram showing a comparative example. It is a diagram showing a comparative example. It is a diagram showing a comparative example. It is a diagram showing the solid-solid phase change material of the second embodiment. It is a diagram showing the windshield connection structure of the third embodiment. It is a diagram showing the windshield connection structure of the fourth embodiment.

[0008] Embodiments of the present invention will be described below with reference to the drawings. Note that the drawings are schematic and may differ from actual examples. Furthermore, the following embodiments are illustrative examples of devices and methods for realizing the technical concept of the present invention, and do not limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0009] 《First Embodiment》 《Configuration》 Figure 1 shows a windshield connection structure 11. The windshield connection structure 11 is applied to the windshield of an automobile and comprises a windshield 12, a body panel 13, and a heat conductor 14. The windshield 12 is a window positioned at the front of the automobile, allowing a view of the foreground, and has black ceramic 16 formed around its edge. The black ceramic 16 prevents the adhesive of the windshield 12 from deteriorating due to sunlight. The body panel 13 is a roof panel with one side facing outwards, its surface direction is approximately horizontal, and the outer surface faces upwards.

[0010] The heat conductor 14 is made of, for example, graphite, which has a higher thermal conductivity than the vehicle body panel 13, and is in surface contact with both the windshield 12 and the vehicle body panel 13 on the inside of the vehicle. The heat conductor 14 is fixed to the windshield 12 by attaching fixing members 17 to both the windshield 12 and the heat conductor 14 while the heat conductor 14 is in contact with the windshield 12. The heat conductor 14 is fixed to the vehicle body panel 13 by attaching fixing members 17 to both the vehicle body panel 13 and the heat conductor 14 while the heat conductor 14 is in contact with the vehicle body panel 13. The fixing members 17 are, for example, adhesive tape or fasteners, and any material can be used as long as the heat conductor 14 is in direct contact with the surface to be fixed and fixed while being pressed down.

[0011] Figure 2 shows a vehicle body panel 13. The vehicle body panel 13 has a radiative cooling layer 21 formed on one side facing outwards. The radiative cooling layer 21 is, for example, a paint film or wrapping film, which radiates heat as electromagnetic waves. Specifically, it utilizes Radi-Cool (registered trademark), a radiative cooling metamaterial technology. That is, microstructured particles are dispersed in the radiative cooling layer 21, and when the temperature rises due to sunlight, an uneven distribution of charge occurs on the surface of the particles. When the charge tries to return to a stable state, electromagnetic waves with a wavelength of 8 to 13 μm are emitted, promoting radiative cooling. The electromagnetic waves with a wavelength of 8 to 13 μm are emitted into space without being absorbed by the atmosphere. Particles that reflect near-infrared rays are also dispersed in the radiative cooling layer 21. Therefore, the temperature of the vehicle body panel 13 decreases due to radiative cooling and the reflection of near-infrared rays.

[0012] Figure 3 shows the windshield 12. The windshield 12 is approximately rectangular when viewed perpendicular to its surface and has a top edge 26 and left and right side edges 27. The top edge 26 is connected to the vehicle body panel 13 via a heat conductor 14, and the left and right side edges 27 are connected to the vehicle body panel 28 via a heat conductor 14. The vehicle body panel 28 is a front pillar with one side facing outwards. Similar to the vehicle body panel 13, the vehicle body panel 28 has a radiative cooling layer 21 formed on one side facing outwards. The heat conductor 14 is in contact with both the windshield 12 and the vehicle body panel 13 along the entire top edge 26 of the windshield 12. The heat conductor 14 is in contact with both the windshield 12 and the vehicle body panel 28 along the entire left and right side edges 27 of the windshield 12.

[0013] 《Effects and Effects》 Next, the main effects and effects of the first embodiment will be described. (1) The windshield connection structure 11 comprises a windshield 12, a vehicle body panel 13, and a heat conductor 14. One side of the vehicle body panel 13 faces outwards. The heat conductor 14 has a higher thermal conductivity than the vehicle body panel 13 and is in contact with both the windshield 12 and the vehicle body panel 13. As a result, heat transfer occurs from the windshield 12 to the vehicle body panel 13 via the heat conductor 14, and radiative cooling occurs in the vehicle body panel 13. Therefore, the temperature rise of the windshield 12 is suppressed, and heat radiation into the vehicle interior is suppressed, improving the comfort of the vehicle interior. Generally, in glass mounting structures, the gap between the laminated glass and the vehicle body panel is sealed with resin molding such as rubber. However, since resin molding such as rubber has low thermal conductivity, when the temperature of the windshield rises due to sunlight, heat transfer to the vehicle body panel is difficult, and there is a problem that the temperature inside the vehicle interior tends to rise due to heat radiation from the windshield.

[0014] Figure 4 shows an example. Figure (a) shows the state before the windshield 12 and the vehicle body panel 28 are connected by the heat conductor 14. When observed with a thermographic camera, the surface temperature of the windshield 12 at the measurement point closest to the vehicle body panel 28 was 37.0°C. Figure (b) shows the state after the windshield 12 and the vehicle body panel 28 are connected by the heat conductor 14. When observed with a thermographic camera, the surface temperature of the windshield 12 at the measurement point closest to the vehicle body panel 28 was 34.1°C. In this way, by connecting the windshield 12 and the vehicle body panel 28 with the heat conductor 14, the temperature rise of the windshield 12 can be suppressed, and heat radiation into the vehicle interior can be suppressed.

[0015] (2) The vehicle body panel 13 has a radiative cooling layer 21 formed on one side which radiates heat as electromagnetic waves. This more reliably suppresses the temperature rise of the wind glass 12. (3) The heat conductor 14 is in contact with both the wind glass 12 and the vehicle body panel 13 on the inside of the vehicle. This suppresses the heat conductor 14 itself from being heated by sunlight and mediates heat transfer from the wind glass 12 to the vehicle body panel 13. Figure 5 shows a comparative example. In this comparative example, the heat conductor 14 is in contact with both the wind glass 12 and the vehicle body panel 13 on the outside of the vehicle. In this comparative example, the heat conductor 14 itself is heated by sunlight, so heat transfer from the wind glass 12 to the vehicle body panel 13 is inhibited.

[0016] (4) The heat conductor 14 is in contact with the region of the windshield 12 where the black ceramic 16 is formed. This suppresses the heat conductor 14 itself from being heated by sunlight and mediates heat transfer from the windshield 12 to the vehicle body panel 13. Figure 6 shows a comparative example. In this comparative example, the heat conductor 14 extends outside the region where the black ceramic 16 is formed. In this comparative example, the heat conductor 14 itself is heated by sunlight, thus inhibiting heat transfer from the windshield 12 to the vehicle body panel 13.

[0017] (5) The heat conductor 14 is in surface contact with the vehicle body panel 13. This increases the contact area between the heat conductor 14 and the vehicle body panel 13, making it easier for heat to be transferred from the heat conductor 14 to the vehicle body panel 13. Figure 7 shows a comparative example. In this comparative example, the heat conductor 14 is in line contact with the vehicle body panel 13. In this comparative example, the contact area between the heat conductor 14 and the vehicle body panel 13 is limited, making it difficult for heat to be transferred from the heat conductor 14 to the vehicle body panel 13. (6) The vehicle body panel 13 is the roof panel of the vehicle. The roof panel has an outer surface facing upward, so it is easier to radiate cooling upward than the front pillar. The roof panel is plate-shaped, so it is easier to secure a contact surface with the heat conductor 14 than the front pillar. Therefore, the temperature rise of the windshield 12 can be effectively suppressed, and heat radiation into the vehicle interior can be suppressed.

[0018] (7) The windshield 12 is the windshield. The windshield is made of laminated glass with an interlayer in between, so its temperature rises easily due to sunlight. Because the windshield has a large surface area, the amount of heat radiated is also large, causing the temperature of the front seats, which are the main interior space of the vehicle, to rise. Therefore, by suppressing the temperature rise of the windshield, the comfort inside the vehicle can be effectively improved. (8) The heat conductor 14 is fixed to the windshield 12 by attaching fixing members 17 to both the windshield 12 and the heat conductor 14 while the heat conductor 14 is in contact with the windshield 12. The heat conductor 14 is fixed to the vehicle body panel 13 by attaching fixing members 17 to both the vehicle body panel 13 and the heat conductor 14 while the heat conductor 14 is in contact with the vehicle body panel 13. As a result, heat transfer occurs from the windshield 12 to the vehicle body panel 13 via the heat conductor 14, and radiative cooling occurs in the vehicle body panel 13.

[0019] (9) The heat conductor 14 is graphite. Graphite has high thermal conductivity. Therefore, it can effectively mediate heat transfer from the windshield 12 to the vehicle body panel 13. If a graphite sheet is used, it can be attached to the windshield 12 and the vehicle body panel 13, so the fixing member 17 can be omitted. (10) The heat conductor 14 is in contact with both the windshield 12 and the vehicle body panel 13 along the entire length of one side of the windshield 12. This allows for effective heat transfer from the windshield 12 to the vehicle body panel 13.

[0020] 《Modifications》 In the first embodiment, a configuration in which a radiative cooling layer 21 is formed on the vehicle body panel 13 was described, but the invention is not limited to this. The phenomenon of lowering the temperature by radiating electromagnetic waves into the surroundings is a property possessed by all materials. Therefore, a general vehicle body panel without a radiative cooling layer 21 may also be used. However, heat transfer from the windshield 12 to the vehicle body panel 13 will not occur unless the temperature of the vehicle body panel 13 is lower than the temperature of the windshield 12. When this condition is met, the temperature rise of the windshield 12 can be suppressed, and heat radiation into the vehicle interior can be suppressed. In the first embodiment, a configuration in which the windshield 12 is a windshield was described, but the invention is not limited to this, and the invention may also be applied to a rear window or a side window.

[0021] 《Second Embodiment》 《Configuration》 The second embodiment shows another aspect of the heat conductor 14, and the other configurations are the same as those of the first embodiment described above. Therefore, the same reference numerals are used for common components, and detailed explanations are omitted. The heat conductor 14 is a solid-solid phase change material that becomes an insulator in the low-temperature phase and a conductor in the high-temperature phase. The solid-solid phase change material is vanadium dioxide (VO2) ２ ) and the phase transition temperature is controlled by elemental doping. Doping with tungsten (W), tantalum (Ta), niobium (Nb), etc., changes the phase transition temperature to a lower temperature, while doping with chromium (Cr) changes the phase transition temperature to a higher temperature. Here, the phase transition temperature is set in the range of, for example, 25 to 30°C.

[0022] Figure 8 shows the solid-to-solid phase transition material 31. Here, the large circles represent vanadium (V), the small circles represent oxide (O), and the shaded circles represent doped tungsten (W). Figure (a) shows the state in which vanadium dioxide is an insulator at low temperatures. In the low-temperature phase, it becomes a monoclinic crystal, and the vanadium atoms are arranged in a zigzag pattern. The solid-to-solid phase transition material 31 suppresses heat transfer from the windshield 12 to the vehicle body panel 13 by becoming an insulator when the ambient temperature is low. Figure (b) shows the state in which vanadium dioxide is a conductor at high temperatures. In the high-temperature phase, the crystal structure expands to become tetragonal, and the vanadium atoms are arranged linearly along one axis. At this time, it is thought that electrons that were bound in the low-temperature phase can move freely. The solid-to-solid phase transition material 31 mediates heat transfer from the windshield 12 to the vehicle body panel 13 by becoming a conductor when the ambient temperature is high.

[0023] <Effects and Effects> Next, the main effects and effects of the second embodiment will be described. (1) The heat conductor 14 is a solid-to-solid phase change material 31 that becomes an insulator in the low-temperature phase and a conductor in the high-temperature phase. The solid-to-solid phase change material 31 becomes a conductor when the outside air temperature is high, mediating heat transfer from the windshield 12 to the vehicle body panel 13 and suppressing the temperature rise of the windshield 12. The solid-to-solid phase change material 31 becomes an insulator when the outside air temperature is low, suppressing heat transfer from the windshield 12 to the vehicle body panel 13 and suppressing the temperature drop of the windshield 12. Therefore, the cooling of the windshield 12 and condensation can be suppressed in cold weather. Other effects and effects brought about by the common configuration are the same as those of the first embodiment described above.

[0024] 《Third Embodiment》 《Configuration》 The third embodiment shows another aspect of the heat conductor 14, and the other configurations are the same as those of the first embodiment described above. Therefore, the same reference numerals are used for common components, and detailed explanations are omitted. Figure 9 shows the windshield connection structure 36. The heat conductor 37 is a metal film that is in contact with the entire surface of the windshield 12 on the inside of the vehicle. The metal film is a Low-E (Low Emissivity) metal film made of, for example, tin oxide or silver, and by making the thickness a thin film on the scale of several tens of nanometers, it becomes almost transparent and visibility is ensured. When the heat conductor 37 and the windshield 12 are superimposed, the transmittance of visible light is set to 70% or more. It is desirable to coat the inside surface of the metal film with a protective layer such as metal oxide to protect the metal film.

[0025] <Effects and Effects> Next, the main effects and effects of the third embodiment will be described. (1) The heat conductor 37 is in contact with the entire surface of the windshield 12. As a result, heat transfer to the vehicle body panel 13 and vehicle body panel 28 occurs via the heat conductor 37 across the entire surface of the windshield 12, that is, not only in the areas near the top edge 26 and the left and right side edges 27 of the windshield 12, but also in the areas near the bottom edge and the central area. Therefore, the temperature rise of the windshield 12 is effectively suppressed, heat radiation into the vehicle interior is suppressed, and the comfort inside the vehicle interior is improved.

[0026] (2) The heat conductor 37 is a metal film. Because the metal film has high thermal conductivity, heat is effectively transferred to the vehicle body panel 13 and the vehicle body panel 28, and the temperature rise of the windshield 12 can be effectively suppressed. (3) The heat conductor 37 is in contact with the inner surface of the windshield 12. Because the metal film has low emissivity, heat radiation to the inside of the vehicle is effectively suppressed. (4) When the heat conductor 37 and the windshield 12 are superimposed, the transmittance of visible light is 70% or more. This ensures good visibility. Other effects brought about by the common configuration are the same as those of the first embodiment described above.

[0027] 《Fourth Embodiment》 《Configuration》 The fourth embodiment shows another aspect of the heat conductor 37, and the other configurations are the same as those of the third embodiment described above. Therefore, the same reference numerals are used for common components, and detailed explanations are omitted. Figure 10 shows the windshield connection structure 41. The heat conductor 42 is a metal film and is in contact with the entire surface of the windshield 12 on the outside of the vehicle. It is desirable to coat the outer surface of the metal film with a protective layer such as metal oxide to protect the metal film.

[0028] <Effects and Effects> Next, the main effects and effects of the fourth embodiment will be described. (1) The heat conductor 42 is in contact with the outer surface of the windshield 12. Because the metal film has a high reflectivity in the near-infrared region, it can reflect near-infrared rays from sunlight outside the vehicle. Near-infrared rays account for about 50% of the sunlight that reaches the Earth's surface, and this becomes thermal energy, so by reflecting near-infrared rays, the temperature rise of the windshield 12 is suppressed. Other effects and effects brought about by the common configuration are the same as those of the third embodiment described above.

[0029] Although the above description has been made with reference to a limited number of embodiments, the scope of the rights is not limited to those embodiments, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art.

[0030] 11... Windshield connection structure, 12... Windshield, 13... Body panel, 14... Thermal conductor, 16... Black ceramic, 17... Fixing member, 21... Radiative cooling layer, 26... Top edge, 27... Side edge, 28... Body panel, 31... Solid-to-solid phase change material, 36... Windshield connection structure, 37... Thermal conductor, 41... Windshield connection structure, 42... Thermal conductor

Claims

1. A windshield connection structure characterized by comprising: a windshield; a vehicle body panel with one side facing outwards; and a heat conductor that contacts both the windshield and the vehicle body panel and has a higher thermal conductivity than the vehicle body panel.

2. The windshield connection structure according to claim 1, characterized in that the vehicle body panel has a radiative cooling layer formed on one side that radiates heat as electromagnetic waves.

3. The windshield connection structure according to claim 1, characterized in that the heat conductor is in contact with both the windshield and the vehicle body panel on the inside of the vehicle.

4. The wind glass connection structure according to claim 1, characterized in that the heat conductor is in contact with the region of the wind glass in which the black ceramic is formed.

5. The wind glass connection structure according to claim 1, characterized in that the heat conductor is in surface contact with the vehicle body panel.

6. The wind glass connection structure according to claim 1, characterized in that the vehicle body panel is the roof panel of the vehicle body.

7. The windshield connection structure according to claim 1, characterized in that the windshield is a windshield.

8. The windshield connection structure according to claim 1, characterized in that the heat conductor is fixed to the windshield by attaching fixing members to both the windshield and the heat conductor while in contact with the windshield, and fixed to the vehicle body panel by attaching fixing members to both the vehicle body panel and the heat conductor while in contact with the vehicle body panel.

9. The window glass connection structure according to claim 1, characterized in that the heat conductor is graphite.

10. The wind glass connection structure according to claim 1, characterized in that the thermal conductor is a solid-to-solid phase change material that acts as an insulator in the low-temperature phase and as a conductor in the high-temperature phase.

11. The window glass connection structure according to claim 1, characterized in that the heat conductor is in contact with the entire surface of the window glass.

12. The window glass connection structure according to claim 11, characterized in that the heat conductor is a metal film.

13. The windshield connection structure according to claim 12, characterized in that the heat conductor is in contact with the inner surface of the windshield.

14. The windshield connection structure according to claim 12, characterized in that the heat conductor is in contact with the outer surface of the windshield.

15. The window glass connection structure according to claim 11, characterized in that the heat conductor and the window glass have a visible light transmittance of 70% or more when they are superimposed together.

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