JP4135609B2 - Thermal functional structure for automobile - Google Patents

Description

  The present invention relates to a thermal functional structure for automobiles that can provide a comfortable indoor temperature environment, and a vehicle body panel structure used for the structure, and in particular, to reduce indoor ambient temperature and interior component temperature during parking in hot weather. The present invention relates to a vehicle body heat insulation and heat dissipation system capable of shielding heat entering from the outside and promoting the release of heat in the room.

  In summer, light, heat, and heat intrusion paths that are parked under hot weather mainly include windshields, rear glasses, front side glasses, rear side glasses, roofs, and the like.

  In conventional general vehicles, laminated glass is often used for the windshield, and single glass is often used for the front side glass. An interlayer film is used to improve the strength of the glass, but this interlayer film is almost equivalent to having no thermal function. The ceiling is made of a combination of cardboard, non-woven fabric and the like, but the ceiling material having such a structure is almost equivalent to having no thermal function.

Among the vehicles that are actually sold, a small amount of heat insulating material (weight per unit of 0.26 kg / m ² ) is used for the ceiling material, while the glass that is another heat intrusion route is a general ultraviolet cut green glass. There are vehicles that use made laminated glass or single glass (having an absorption function for infrared rays). In such a vehicle, despite the fact that a heat insulating material is used for the ceiling material, it is a fact that a remarkable effect of reducing the indoor temperature at the time of stopping cannot be obtained.

  As described above, when there are two heat intrusion paths into the room and the heat countermeasure is applied only to one of the heat intrusion paths, the effect of the heat countermeasure is reduced when viewed as the entire vehicle. This is because, although the room temperature is lowered by taking a countermeasure on one heat intrusion path, further heat intrusion is caused from the other heat intrusion path on which the countermeasure has not been taken. For example, when two heat intrusion paths into the room are considered, glass and ceiling, when measures are taken only for glass, the amount of heat input from the glass decreases and the room temperature slightly decreases. As is apparent from the thermal resistance value, the amount of heat input from the ceiling increases conversely, and as a result, the decrease in room temperature decreases. On the contrary, the same thing happens when a heat insulating material is used for the ceiling material and no measures are taken on the glass. In this case, since the countermeasure is not taken for the glass whose energy transmission amount is larger than that of the ceiling, the effect of lowering the room temperature becomes smaller. Of course, the same thing can occur except for the combination of glass and ceiling.

  In the conventional vehicle having such a configuration, it is difficult to say that the invasion of heat is sufficiently prevented, and the indoor temperature of the automobile placed in the hot environment is very high. In the measurement example in the summer environment in Japan, the indoor air temperature reaches approximately 70 ° C. in the case of parking. At the same time, the interior interior material temperature rises close to 100 ° C. on the top surface of the instrument panel and close to 70 ° C. on the ceiling. It goes without saying that the passengers feel uncomfortable when riding in such a situation, but even after the ventilation or air conditioner is activated, the temperature of the interior material does not drop easily, and it continues to radiate radiant heat to the occupant for a long time, greatly reducing comfort. ing.

  2. Description of the Related Art In recent years, various heat countermeasures have been proposed to reduce the amount of intrusion heat by shielding light and thermal energy flowing into a room for the purpose of suppressing an increase in indoor temperature and reducing a cooling load. Reducing the indoor thermal load not only reduces occupant discomfort, but also reduces fuel consumption, and further improves fuel economy by reducing the weight of air conditioners. It is done.

  A vehicle with improved heat insulation is disclosed in Patent Document 1 as a heat-insulated automobile. In the heat insulating automobile disclosed in Patent Document 1, since the heat insulating material is installed in every place, it is difficult to meet the recent request to reduce the weight of the vehicle. In addition, since heat intrusion due to heat conduction of the material used as the heat insulating material is not considered, there is a possibility that the effect of lowering the room temperature cannot be sufficiently exhibited.

  Regarding glass for the purpose of heat insulation, many techniques have been proposed as seen in Patent Documents 2-6. For example, the solar radiation transmittance into the room is lowered by adjusting the composition of the glass and increasing the absorption rate so that the glass absorbs part of the solar radiation. In the current vehicle, when the windshield glass is taken as an example, the solar radiation transmittance is set to 45 to 53%, for example. This reduces the amount of solar radiation that passes through the glass and enters the room. However, in the case of glass used for vehicles, a visible light transmittance of 70% or more is required by law, so that it is difficult to obtain a remarkable heat insulating effect. Further, when applied to a vehicle, the heat intrusion path into the room changes, and as described above, further heat intrusion occurs from another heat intrusion path other than glass.

  As other heat countermeasures, a heat countermeasure for ventilation using a solar cell or the like (see Patent Document 7), a light shielding ventilation structure (see Patent Document 8) in which a light shielding shade is provided to provide a ventilation path, and the like have been proposed. . However, the heat countermeasures described in Patent Documents 7 and 8 require that a new device be mounted on the vehicle, which may increase weight and cost.

  In addition to the intrusion of solar radiation into the room and the intrusion of heat into the room from the body panel that has absorbed the solar radiation, there are sufficient escapes and heat dissipation from the heat trapped in the room. It can also be mentioned that it does not happen.

  The heat countermeasure applied to the outer panel constituting the vehicle body panel will be further described. Regarding heat transfer via the outer panel, there are cases where measures are taken on the surface of the outer panel, that is, the surface exposed to solar radiation, and cases where measures are taken on the back side of the outer panel. Coating that suppresses the absorption of solar radiation on the panel surface is well known in, for example, the construction field, but does not satisfy the application requirements in a field that requires a high degree of design, such as an outer panel of a vehicle. On the other hand, as measures against the back side of the outer panel, measures that focus on the surface opposite to the back surface of the outer panel, that is, the back surface of the interior constituting the cabin (for example, see Patent Document 9), or the back surface of the outer panel itself. A focused measure (for example, see Patent Document 10) is known.

  Patent Document 9 discloses a technique for reducing the emissivity of the back surface of the interior. This technology reduces the emissivity of the most part of the interior back surface, while taking into consideration the design of the vehicle, heat transfer from the back surface of the outer panel, mainly reflecting the radiation to prevent heat intrusion. To do.

  Patent Document 10 discloses a technique for improving the indoor environment by sticking a thin heat insulating material to most of the rear surface of the outer panel.

  However, the technique described in Patent Document 9 is disadvantageous when it is desired to release the heat once entering the room, that is, when heat is released from the room to the outside. Similarly, even the technique described in Patent Document 10 is disadvantageous when heat is released from the room to the outside.

None of the prior arts considers the heat radiation of the room air, the outer panel, and the interior, and none of them improve the indoor environment by performing both heat insulation and heat radiation in a well-balanced manner.
Special table 2001-500818 JP 2001-226148 A JP 2001-151539 A JP 2001-146440 A JP 2001-39741 A JP 2001-39742 A JP-A-9-295509 JP 2002-331822 A JP 2001-158306 A JP 2002-012094 A

  Based on the current situation as described above, the inventors newly analyzed the heat input and output when the vehicle was stopped under the hot sun. As a result, it was found that the solar radiation energy that entered the room through the window glass was dissipated by convective heat transfer mainly through the window and the vehicle body on the side not receiving solar radiation. In addition, in the vehicle body structure that has been proposed so far, the effect of radiant heat is great when solar radiation is received on window glass, etc., and it is accompanied by heat radiation to the indoor side, so the effect of improving the indoor temperature environment is substantially improved. It will be smaller. In view of the above points, the present inventors have completed the present invention.

  Therefore, in consideration of the fact that the object of the present invention can be realized without largely changing the basic style and manufacturing process of the current vehicle, the heat insulation effect of the vehicle body is enhanced and the radiant heat is also blocked, and the object is left under the hot sun. This is to greatly improve the indoor temperature environment.

  In addition, the present invention has been made for the purpose of optimal material arrangement, lowering the indoor temperature when the vehicle is stopped under the sun, reducing the temperature load on the human body, and reducing the load during the cool-down of the air conditioner. .

  Examples of the heat intrusion path into the room include the roof and windshield described above, the upper part of the door structure, and the pillars of A, B, and C. Since these parts are exposed to the airflow during running, the temperature of the outer surface decreases, and the parts act as a heat release path to the outside of the passenger compartment. However, when parking, the airflow outside the passenger compartment is significantly smaller than when traveling, so the energy absorbed by each part is radiated into the room as far infrared rays, and as a result, the room is warmed. And immediately after boarding, a passenger | crew will be forced too severe temperature environment.

  In order to solve such a problem, the present inventors paid attention when the vehicle stopped. When the vehicle stops, the temperature of the window glass becomes high, and the temperature decreases in the order of the window glass, indoors, and outside air. For this reason, far infrared rays are radiated from the window glass to either side. Furthermore, similar heat input is caused from the ceiling which is another main heat intrusion route.

  As a result of intensive investigations on methods for preventing these heat intrusions, the inventors have devised the following invention that can greatly prevent the intrusion of heat into the room.

  Furthermore, the present inventors have found that there are a portion that requires heat insulation and a portion that is suitable for heat dissipation on the back surface of the outer panel, the surface facing the outer panel of the passenger compartment. By improving the surface facing the outer panel, the present invention has been completed that can solve the two conflicting problems of heat dissipation from the interior of the vehicle body panel and interior parts and the interior, while insulating the body panel.

  Therefore, an object of the present invention is to suppress the intrusion of heat from the portion of the outer panel where heat is easily received into the passenger compartment, thereby preventing a significant increase in the temperature of the passenger compartment, the outer panel, the interior parts, and the like. Let's aim. Furthermore, it aims at lowering the ambient temperature of the entire passenger compartment by promoting heat radiation from the passenger compartment to the outside, and lowering the component temperature by releasing the heat absorbed by the components outside the passenger compartment. As a result, the present invention seeks to provide a vehicle that can promote indoor temperature comfort.

  The present invention suppresses deterioration of the indoor environment due to heat intrusion into the room from the outer panel whose temperature has risen due to solar radiation, and promotes heat dissipation to improve it when the indoor environment deteriorates As a means, the above object is achieved by paying attention to a thermal functional structure for automobiles and a vehicle body panel structure used in the structure, and satisfying the following requirements.

That thermal-function structure for an automobile according to the present invention, 2 is divided into the upper hull and the lower part of the vehicle body as a boundary substantially horizontal boundaries of the vehicle body to define a passenger compartment, in the vehicle body upper portion, while providing the means having a heat insulating function of reducing the heat input from the site receiving the solar radiation directly into the passenger compartment, in the vehicle body lower part relatively temperature is lower than the upper body, the heat transfer of the upper body to the lower body it is provided with a means having a heat dissipation function of promoting heat radiation to the vehicle exterior by heat transfer without communicating vehicle exterior and the vehicle interior of the heat.

According to the present invention, both the heat insulating function and the heat radiating function are provided in a well-balanced manner, and the intrusion of heat into the vehicle compartment from the heat-sensitive portion of the outer panel at the upper part of the vehicle body is suppressed, so that the vehicle compartment, the outer panel, the interior, etc. The temperature of the parts themselves can be prevented from rising significantly, and further, heat is transferred from the lower part of the vehicle body to the outside of the vehicle compartment, where the temperature is relatively low with respect to the upper part of the vehicle body, by transferring heat without communicating with the outside of the vehicle compartment. The vehicle temperature can be lowered by lowering the ambient temperature of the entire vehicle interior and releasing the heat absorbed by the components outside the vehicle. Is possible.

(1. Thermal functional structure for automobiles)
First, a heat transfer mode during parking of a general vehicle will be described. 1 to 3 are conceptual diagrams showing heat transfer modes when a general vehicle 100 is parked.

  As shown in FIG. 1 and FIG. 2, in a general vehicle 100, when solar radiation hits, the members in the passenger compartment R are heated by absorbing the solar radiation and release heat by convective heat transfer to the room air. . In the door structure 30 which is one of the vehicle body panel structures, as shown in FIG. 3, the outer panel 31 constituting the exterior of the door is heated by absorbing solar radiation, and the inner panel 32 facing the outer panel 31 and Heat passes through the indoor trim 33 such as a door trim to the room air by radiation and convection heat transfer. As a result, the room temperature rises. Typical members that serve as heat radiation sources are a roof 34, a windshield 35, a side glass 36 (a general term for the front side glass 36a and the rear side glass 36b), a window glass such as a rear glass 37, an instrument panel 38, a rear parcel shelf 39, and a seat 40. The seat surface 40a and the indoor trim 33 increase the temperature of these members, thereby increasing the indoor temperature. This phenomenon is repeated with time, and in the indoor temperature distribution, the air temperature above the room becomes very high. Furthermore, since the member temperature at the upper part of the vehicle body becomes very high, heat radiation to the human body due to radiation is large even when the occupant gets in, which is a major cause of discomfort when getting in.

  The operation of the present invention will be described.

  FIG. 4 is a view for explaining the thermal functional structure for automobiles according to the present invention, and is a longitudinal sectional view of the vehicle body 50 as viewed from the front.

  The thermal functional structure for automobiles according to the present invention divides a vehicle body 50 for partitioning a vehicle compartment R into a vehicle body upper part 52 and a vehicle body lower part 53 with a substantially horizontal boundary line 51 as a boundary. 52 is provided with a means 61 having a heat insulating function, and a vehicle body lower part 53 is provided with a means 62 having a heat radiating function.

  The boundary line 51 is set, for example, at a substantially central position 58a on a vertical line 58 connecting the door panel upper end 54 and the side sill lower end 55 with a vertical line 57 from the ground surface 56. Note that the boundary line 51 may be included in either the vehicle body upper part 52 or the vehicle body lower part 53. The number of boundary lines 51 may be one, but a plurality of boundaries may be set in order to define different boundaries between the side of the vehicle body and the front of the vehicle body, for example.

  Regarding the temperature rise of the indoor space when left under the hot sun, the outer panel 31 and the like surrounding the indoor space are heated by solar radiation and the like, and the temperature of the indoor air is increased by heat conduction, radiation, convective heat transfer, and the like. The inventors paid attention to the temperature behavior of the outer panel 31 in this mechanism. Assuming that it is left in the sun, the time zone during which the temperature rises remarkably reaches the maximum temperature is around 10:00 am to 2:00 pm. It is found that the part where the outer panel 31 acts as the heat input part in this time zone is the part that is exposed to direct sunlight, and the other vehicle body lower part 53 has a low temperature and does not act as the heat input part. It was done. Therefore, according to the present invention, the vehicle body 50 is divided into two parts, the vehicle body upper part 52 and the vehicle body lower part 53, with the boundary line 51 as a boundary. Is intended.

  Another factor in the increase in the room temperature is a path in which light energy transmitted through the window glasses 35, 36, and 37 is absorbed by the interior material and released into the room as heat energy. Examples of the target part of this phenomenon include the interior trim 33 and the cushion of the seat 40 in addition to the surface of the instrument panel 38 and the rear parcel shelf 39. Among these, there is a cushion of the seat seating surface 40a as a part having a great influence on the rise in room temperature. The position of the seat seat surface 40 a varies depending on the shape and form of the vehicle 100. Automobiles can be classified into sedan, coupe, 1BOX, and other vehicle types based on their vehicle shape. In each vehicle type, the seat seating surface 40a is connected to the door panel upper end 54 and the side sill lower end 55 by a vertical line 57 from the ground surface 56. The vertical line 58 is located at a position 58b at a length ratio of 20 to 60% in the upward direction from the side sill lower end 55 with respect to the entire length of the vertical line 58. When the boundary line 51 is set at the position 58b and the vehicle body 50 is divided into the vehicle body upper part 52 and the vehicle body lower part 53, the inventors find that the indoor temperature distribution and the heat flow in the entire vehicle 100 are greatly different. It was. This is considered to be due to the fact that the solar radiation directly hits the outside of the vehicle and heats into the room, and that the part that becomes the heat source in the room serves as a boundary to form the indoor temperature distribution and heat flow.

  Therefore, it is possible to reduce the room temperature by dividing the vehicle body 50 into the vehicle body upper part 52 and the vehicle body lower part 53 on the basis of the boundary line 51 and providing separate thermal function means at the respective parts. In the present invention, by providing means having a heat insulation function in the upper part 52 of the vehicle body and means having a heat dissipation function in the lower part 53 of the vehicle body, the indoor temperature environment when left in the hot sun can be improved.

  Hereinafter, an embodiment of a thermal functional structure for automobiles according to the present invention will be described.

  FIG. 5 is a schematic view showing a vehicle to which an automotive thermal functional structure according to an embodiment and Example 1 described later is applied, and shows a vehicle body 50 in a longitudinal section when viewed from the front.

  An outline of the thermal functional structure for an automobile according to the embodiment is divided into a vehicle body upper portion 52 and a vehicle body lower portion 53 with a substantially horizontal boundary line 51 as a boundary. The vehicle body upper part 52 is provided with means 61 having a heat insulation function, while the vehicle body lower part 53 is provided with means 62 having a heat dissipation function. The reason why the vehicle body upper part 52 and the vehicle body lower part 53 are divided into the vehicle body upper part 52 and the vehicle body lower part 53 is that the temperature rise of the outer panel 31 is divided into a part with a large temperature rise and a small part when left in the sun as described above. is there. The boundary line 51 is set at a substantially central position 58 a in a vertical line 58 that connects the door panel upper end 54 and the side sill lower end 55 with a vertical line 57 from the ground surface 56.

  In the general vehicle 100, as shown in FIGS. 1 to 3, since no means for radiating heat is provided, heat input from the outside of the vehicle to the interior is overwhelmingly large. The present situation is that the room temperature reaches equilibrium at a temperature as high as 30 ° C. or more with respect to the outside of the vehicle.

  On the other hand, in the thermal functional structure according to the embodiment, as shown in FIG. 5, since the vehicle body upper part 52 is provided with means 61 having a thermal insulation function, the portion with the highest heat input is insulated. The amount of heat entering the room can be reduced as much as possible. Furthermore, since the vehicle body lower portion 53 is provided with means 62 having a heat radiation function, heat is radiated at the lowest temperature in the vicinity of the outer panel 31, so that the temperature difference with the room can be maximized, Maximum heat energy can be released. As a result, the indoor temperature can be relatively lowered.

  In general vehicle 100, roof 34, window glasses 35, 36, and 37, indoor trim 33, seat 40, and the like absorb solar radiation and rise in temperature, and then radiate their thermal energy into the room. Has been released. When an occupant gets in the hot weather, heat energy is radiated to the occupant, creating an uncomfortable feeling when getting in.

  On the other hand, in the thermal functional structure according to the embodiment, the temperature of members such as the roof 34, the window glasses 35, 36, and 37, the indoor trim 33, and the seat 40, which has a particularly large influence on the occupant, is lowered. The radiation of heat energy to the passengers is also reduced. As a result, it is possible to reduce discomfort during boarding.

  The boundary line 51 has a length ratio in the upward direction from the lower end of the side sill 55 with respect to the entire length of the vertical line 58 in the vertical line 58 connecting the upper end 54 of the door panel and the lower end of the side sill 55 with a vertical line 57 from the ground surface 56. It is more preferable to set the position 58b between 20% and 60%.

  The position 58b of 20% to 60% is determined based on the position of the seat seating surface 40a that greatly affects the indoor temperature. By setting the boundary line 51 at the position 58b, the vehicle body 50 is This is because the vehicle body upper part 52 and the vehicle body lower part 53, which are significantly different in temperature distribution and heat flow, are preferably divided into two parts so that the heat insulation function and the heat radiation function can be exhibited more efficiently. The position of the seat seat surface 40a varies depending on the vehicle type. As a typical example, in a general sedan type, it is installed at a position of about 50% in length ratio from the side sill lower end 55 with respect to the entire length of the vertical line 58, and in the 1BOX type, 50%. It is installed at a position of% -60%, and in a sports coupe type, it is installed at a position of 20% -30%. Therefore, in the present invention, the position of the boundary line 51 is set to the position 58b of 20% to 60%. Within this range, a temperature difference appears up and down on the indoor side, that is, the interior side, and this temperature difference is a guideline for selecting or determining an effective means for preventing heat intrusion and an effective means for promoting heat dissipation. In addition, about the position which sets the boundary line 51, there exists the optimal value which was illustrated above for every vehicle type, However, A setting position is not limited for every vehicle type, It can be changed suitably. Not too long.

  The means 61 having the heat insulating function preferably includes at least one of heat insulating glass and / or heat ray reflective glass and heat insulating material.

  The window glass such as the windshield 35, the side glass 36, and the rear glass 37 has at least one function of heat ray absorption and heat ray reflection, thereby preventing the heat from entering the room through the window glasses 35, 36, and 37 and increasing the temperature. It is because it can reduce. Similarly, by including a heat insulating material, it is possible to prevent the heat from entering from the vehicle body upper part 52 into the room and reduce the temperature rise.

  When only one of the heat insulating glass and / or the heat ray reflective glass or the heat insulating material is used, a portion where the other which is not used is to be provided becomes a heat intrusion path. For example, when only heat insulating glass and / or heat ray reflective glass is used, the amount of heat input from the window glass 35, 36, 37 is reduced, so that the room temperature is slightly reduced. On the contrary, the amount of heat input from 52 is increased, and as a result, the decrease in the room temperature is reduced. On the contrary, the same thing happens when a heat insulating material is used for the vehicle body upper part 52 exposed to sunlight and no heat countermeasures are taken for the window glasses 35, 36, and 37. Therefore, the means 61 having a heat insulating function preferably includes both the heat insulating glass and / or the heat ray reflective glass and the heat insulating material as a constituent material of the vehicle body upper part 52 exposed to sunlight. This is because the maximum effect for reducing the room temperature can be obtained and the room temperature can be lowered efficiently. Here, the “vehicle body upper portion 52 exposed to sunlight” refers to a member installed in a room inside the outer panel 31. There is a constituent material as a material constituting the vehicle body upper part 52 which is exposed to solar radiation, and a heat insulating material is used as the constituent material.

  The heat insulating material refers to a material having low thermal conductivity and thermal resistance. Examples include foamed materials such as expanded polystyrene and expanded polypropylene, and nonwoven fabrics made of felt and polyester. Moreover, it is also possible to make a heat insulating structure using a reflector and a space. These materials and structures generally have a thermal conductivity of about 0.01 to 0.05 W / (m · k), a thickness of about 5 cm, and a thermal resistance of about 1 to 5 (m2 · k) / W. Is the structure. Here, the thermal conductivity and the thermal resistance value are values evaluated in accordance with JIS A1412-1.

  Further, “heat ray absorption” and “heat ray reflection” here are mentioned as functions of the window glasses 35, 36, and 37 in order to prevent energy intrusion due to sunlight (sunlight) into the room. The windshield 35 and the front side glass 36a are required to have a visible light transmittance (Tv) of 70% or more of solar radiation components in accordance with the law. As a means for lowering the solar transmittance (Te) within a range not hindering this, a function of heat ray absorption and / or heat ray reflection is used. The rear side glass 36b and the rear glass 37 are not limited to this.

  "Heat ray absorption" means to prevent other solar radiation components from being absorbed by the glass while satisfying legal restrictions. "Heat ray reflection" refers to means to prevent other solar radiation components from being reflected. .

  The values of solar reflectance (Re), solar transmittance (Te), visible light reflectance (Rv), and visible light transmittance (Tv) described in this specification are measured according to JIS R3106. is there.

  As a material of these window glasses 35, 36, and 37, generally used glass can be applied. Of course, it may be transparent, colorless or colored glass. For example, clear glass, green glass, bronze glass, gray glass, blue glass, UV-cut heat insulating glass, heat ray absorbing glass, tempered glass, and the like can be used in combinations within a range that satisfies the above conditions.

  Of course, the glass itself can have a function of absorbing and reflecting heat rays, and may have other functions (antibacterial, deodorizing, etc.).

It is preferable that the means 62 having a heat radiation function includes either a high heat conductive material or a high radiation material.

  Examples of the high thermal conductive material include metals, thermal conductive ceramics, carbon fibers, graphite, or resin composites containing them as fillers, and the thermal conductivity thereof is, for example, 10 W / m / K or more. is there. Metal is preferable when importance is attached to thermal conductivity. The type of metal is not particularly limited, and a steel material is preferable from the viewpoint of low cost, and aluminum, magnesium, or an alloy thereof is preferable from the viewpoint of weight reduction and thermal conductivity. That is, it can be selected as appropriate in consideration of cost and performance.

  The thermal conductivities of iron, aluminum, and magnesium are about 80 W / m / K, 237 W / m / K, and 156 W / m / K, respectively. For example, when a metal plate having a thickness of about 0.5 mm is laminated on a base resin having a thickness of 2 mm, the heat transfer performance is about 40 to 120 times that of a base resin having a thickness of 2 mm alone. Is possible.

The material of the high thermal conductive material is preferably carbon fiber when weight reduction and thermal conductivity are important. For example, the thermal conductivity of the carbon fiber with respect to the fiber direction is 180 W / m / K in the normal grade and 1200 W / m / K in the high thermal conductivity grade. The specific gravity is about 2 g / cm ^3, which is about 80% of that of aluminum.

  Furthermore, the material of the high thermal conductivity material is not limited to a single material, and a composite material containing metal or carbon fiber can also be applied. For example, a laminate of dissimilar metals such as iron and aluminum is preferable in that it can share functions of thermal conductivity and rigidity, and a composite material in which carbon fibers are bonded with a resin can share functions of weight reduction and rigidity. Is preferable. Moreover, it is also possible to use a heat pipe as a high heat conductive material. As the working fluid used in the heat pipe, water, ammonia and the like can be raised. However, from the viewpoint of safety and the operating temperature range, it is preferable to use water as the working fluid in the present invention.

Examples of the high radiation material include paints and resin films containing a room temperature far infrared radiation radioactive filler. Known as room temperature far infrared radioactive fillers are transition metal element oxide ceramics, natural ores, natural carbides, activated water, and the like. Examples of the transition metal element oxide-based ceramics include TiO ₂ , SiO ₂ , ZrO ₂ , Al ₂ O ₂ , MgO, BaSO ₄ , MnO ₂ , Fe ₂ O ₃ , ZrSiO ₂ , CoO, CuO, CrO ₃ , TiO, It contains fine particles of metal oxides such as TiN, ZrC, TiC, SnO ₂ and rare earth metal oxides such as neodymium, lanthanum, yttrium, etc., and a small amount of silica, alkali metal oxides, alkaline earth metals Oxides, Group 8 metal oxides, phosphorus compounds, and the like may be included. Known natural ores include mica, trimarine (tourmaline), and auraston. Known natural carbides include those obtained by carbonizing seaweed into fine powder, charcoal represented by Bincho charcoal, carbon black, carbon fiber, and the like.

  Such room-temperature far-infrared radioactive filler can efficiently emit far-infrared rays over a wide wavelength range of 4 to 20 μm or more.

  When kneading and using a room temperature far infrared radiation filler on the surface of a paint and a resin film, or using it by adhering it to the surface, one or several kinds of room temperature far infrared radiation fillers are used in order to improve the far infrared radiation performance. You may mix and use.

  The far-infrared emissivity of the material used as the far-infrared radioactive filler preferably has a far-infrared emissivity of 70% or more with respect to the ideal black body. More preferably, by setting it to 80% or more, it becomes possible to radiate very efficiently. The far-infrared radiation amount is radiated more as the temperature is higher, but in the case of textile products, it is preferable to have a high radiation ability at a temperature near low temperature, that is, 30 to 40 ° C. Absent.

  The upper part 52 of the vehicle body is the roof 34, A, B, C, D pillar, windshield 35, side glass 36, rear glass 37, the upper part of the door structure 30 positioned above the boundary line 51, and above the boundary line 51. Including at least one of an upper part of a rear fender located at the upper part of the rear hatch door and an upper part of a rear hatch door located above the boundary line 51, and means 61 having a heat insulating function being installed at at least one of these parts. desirable.

  By installing the means 61 having a heat insulating function in these parts, it is possible to prevent heat input from a place where the solar radiation directly enters or a place where the solar radiation may be absorbed and radiated indoors.

  The vehicle body upper part 52 includes a roof 34, and the means 61 having a heat insulating function provided on the roof 34 is preferably formed of a reflective heat insulating material.

In addition, the vehicle body upper part 52 includes A, B, C, D pillars, an upper part of the door structure 30 positioned above the boundary line 51, an upper part of the rear fender positioned above the boundary line 51, and the boundary line 51. The means 61 having at least one of the upper parts of the rear hatch door located on the upper side and having a heat insulating function provided on the upper part of the rear hatch door is the vehicle interior R side and / or the outer panel 31 of the outer panel 31 constituting the exterior of the vehicle. It is preferable that the reflector is provided on the outer side of the inner panel 32 opposite to the vehicle. Here, as the means 61 having a heat insulating function provided at the upper part of the door structure 30, the upper part of the rear fender, or the upper part of the rear hatch door, it is preferable to further install a reflective heat insulating material on the outside of the interior trim 33. . The vehicle body upper part 52 is used for a thermal functional structure for automobiles and forms a vehicle body panel structure having a substantially vertical surface. However, the present inventors have described a vehicle body panel structure having a substantially vertical surface. Has developed the invention. Therefore, only an example is shown here, and a detailed description of the vehicle body panel structure will be described later.

  The vehicle body upper part 52 includes at least one of a windshield 35, a side glass 36, and a rear glass 37, and the means 61 having a heat insulating function provided on these includes at least one function of a heat ray absorbing function and a heat ray reflecting function. It is preferable to comprise from the glass material which has.

  This is because the best combination of heat insulation structures for the vehicle body upper part 52 can be obtained by the above combination.

  The structure of the reflective heat insulating material in the present invention includes a reflective layer composed of a metal foil and / or a metal vapor-deposited film on the outer panel 31 side, and a heat insulation composed of a fiber assembly and / or a foamed layer on the indoor side. It is a laminate in which layers are formed. The reflective material prevents radiation from the outer panel 31 by reflection, and the laminated heat insulating material prevents heat from entering. As the reflecting material, in order to maintain the reflecting function, it is preferable to hold a thin plate having an infrared reflecting function on the surface of the material. The thin plate having an infrared reflection function is composed of a metal foil, a metal-deposited film, each alone or a combination thereof. As an ideal reflecting material, it is desirable that the infrared reflectance is 70% or more. From the viewpoint of availability of materials and ease of handling, a heat ray reflecting film in which a layer having an infrared reflecting function is deposited on a metal. It is particularly desirable that

  As a layer having an infrared reflection function used in the present invention, an aluminum foil, a copper foil, an aluminum oxide, a metal vapor-deposited film obtained by sputtering copper oxide on the resin film surface, and a transparent resin layer were attached. Aluminum foil, copper foil to which a transparent resin layer is attached, resin film to which aluminum is attached, resin film to which a reflective paint is applied, resin film mixed with a reflective material and / or a white pigment, aluminum oxide, copper oxide Although the metal vapor deposition film obtained by sputtering on the nonwoven fabric comprised by polyester or polyester fiber can be used, it does not specifically limit.

  The vehicle body lower part 53 is located below the floor, the lower part of the door structure 30 located below the boundary line 51, the lower part of the rear fender located below the boundary line 51, and the lower side of the boundary line 51. It is desirable to install means 62 having a heat dissipation function in at least one of these parts, including at least one of the lower part of the rear hatch door.

  The reason why the means 62 having a heat radiation function is installed in these portions is that, as described above, the vicinity temperature is lower than the room temperature in order to radiate heat to the outside. In general, in a vehicle body 50 for an automobile, the temperature in the vicinity of the vehicle body 50 is very high in a portion exposed to solar radiation. For this reason, when a heat dissipation mechanism is installed in a part exposed to solar radiation, the nearby air flows backward or the thermal energy of the nearby air flows backward from the heat radiation part. This is because it becomes difficult to do.

  The vehicle body lower part 53 includes a lower part of the door structure 30 positioned below the boundary line 51, a lower part of the rear fender positioned lower than the boundary line 51, and a rear hatch door positioned lower than the boundary line 51. Means 62 having a heat radiation function provided at the lower part of the door structure 30, the lower part of the rear fender, and the lower part of the rear hatch door is a paint having a high emissivity in the far infrared region. In this case, it is preferable to use an infrared absorbing paint.

  The vehicle body lower portion 53 includes a floor, and the means 62 having a heat radiation function provided on the floor is preferably constituted by a heat radiation carpet using a heat conductive material.

  The lower part 53 of the vehicle body includes a floor, and the means 62 having a heat radiation function provided on the floor transfers heat between the heat sink provided on the floor and the heat sink from above the instrument panel 38 and / or the rear parcel shelf 39. A heat pipe to perform, and may be configured to dissipate heat from the heat sink. A good heat conductor may be used instead of the heat pipe.

  These means 62 having a heat radiating function may be used alone or in combination, and sufficient effects can be exhibited in any use form.

  One or more means selected from the above-mentioned means 61 having a heat insulation function are provided in the upper part 52 of the vehicle body, and one or more means selected from the means 62 having a heat dissipation function are provided in the lower part 53 of the vehicle body. Is preferred.

With this configuration, heat input caused by solar radiation from outside the vehicle can be prevented and the maximum amount of indoor heat energy can be released. In addition to reducing the discomfort when getting into the car, and improving the thermal insulation effect in the car, it not only makes the passengers comfortable, but also reduces the cooling load, greatly reducing fuel consumption and reducing CO ₂ emissions. It contributes.

  According to the thermal functional structure for an automobile of the present invention, the vehicle body 50 for defining the compartment R is divided into the vehicle body upper part 52 and the vehicle body lower part 53 with a substantially horizontal boundary line 51 as a boundary. The vehicle body upper part 52 is provided with a means 61 having a heat insulation function, while the vehicle body lower part 53 is provided with a means 62 having a heat radiation function, so that heat input from a portion directly receiving solar radiation is reduced and passengers can be reduced. By reducing the radiation from the interior trim of the vehicle and promoting heat radiation from the portion where the temperature difference between the interior trim and the outside atmosphere is the largest, the air temperature in the indoor upper space and the air in the indoor lower space It is possible to reduce the temperature difference between the temperature and the air temperature in the entire room.

  EXAMPLES Hereinafter, although an Example and a comparative example are further demonstrated in detail with drawing, this invention is not limited to these Examples.

(Example 1)
Referring to FIG. 5, means 61 having a heat insulation function is provided in the upper part 52 of the vehicle body above the boundary line 51, and means 62 having a heat dissipation function is provided in the vehicle body lower part 53 below the boundary line 51.

In the vehicle 100 according to the first embodiment, the reflective heat insulating material 64 is disposed on the head lining 63. The reflective heat insulating material 64 uses a fiber-based heat insulating material (manufactured by Sumitomo 3M Co., Ltd., product name: cinsalate, surface density 400 g / m ² ) as a heat insulating layer, and a metal-deposited resin film (manufactured by Unitika Ltd.,) Product name: Emblene, model number: MP-25) was bonded as a reflective layer. The spatial distance between the reflective layer and the outer panel 31 was 10 mm.

  As the windshield 35, the side glass 36, and the rear glass 37, laminated glass (Cool veil manufactured by Asahi Glass Co., Ltd.) with Tv 78% and Te 43% using a heat ray absorbing film as an intermediate film was used.

As shown in FIG. 6, a reflector 65 is installed on the upper portion of the door structure 30. Reflectors 65 were also installed inside the A, B, and C pillars. In the upper part of the door structure 30, the reflective material 65 is installed on both the vehicle compartment R side of the outer panel 31 and the vehicle outer side of the inner panel 32 so that multiple reflection occurs. As the reflecting material 65, the above-described metal-deposited resin film (manufactured by Unitika Ltd., trade name: Embrene, model number: MP-25) was used. Further, a heat insulating material 66 is further installed on the vehicle exterior side of the door trim which is the indoor trim 33. As the heat insulating material 66, a fiber heat insulating material (manufactured by Sumitomo 3M Limited, trade name: cinsalate, surface density 400 g / m ² ) was used. On the other hand, an electrodeposition paint mixed with carbon black was applied to the lower portion of the door structure 30 as an infrared absorbing paint 67 which is a means 62 having a heat dissipation function. The above structure was applied to all doors to form a thermal functional structure.

( Reference Example 1 )
FIG. 7 is a diagram for explaining Reference Example 1 of the present invention.

The reference example 1 is obtained by modifying the means 62 having a heat dissipation function with respect to the first embodiment. The means 62 having a heat radiation function of the reference example 1 is provided with a mesh structure 68 below the indoor trim 33, and is modified so as to be ventilated from the indoor side to the outside of the vehicle. The other structure is the same as that of the first embodiment.

( Example 2 )
FIG. 8 is a diagram for explaining the second embodiment of the present invention.

In the second embodiment, the means 62 having a heat radiation function is modified with respect to the first embodiment. The means 62 having a heat radiation function of the second embodiment is obtained by replacing the floor carpet provided on the floor 69 with a heat radiation carpet 70. As for the structure of the heat-dissipating carpet 70, the napped layer is a tufted skin using a high-transmittance non-colored polyester fiber (diameter 70 μm), and the base fabric layer is a polyester fiber (diameter 40 μm) kneaded with 2% by weight of carbon black. A nonwoven fabric (weight per unit area: 600 g / m 2, thickness: 5 mm) is prepared and laminated.

( Example 3 )
FIG. 9 is a diagram for explaining the third embodiment of the present invention.

In the third embodiment, the means 62 having a heat radiation function is modified with respect to the first embodiment. The means 62 having a heat radiation function of the third embodiment is a heat pipe 72 in which a heat collecting plate 71 made of a metal plate is inserted into the instrument panel 38 and a resin molded body and the rear parcel shelf 39 and connected to one end of the heat collecting plate 71. The other end is connected to a heat sink 73 installed in the lower part 53 of the vehicle body. The means 61 having a heat insulating function has the same structure as that of the first embodiment.

(Comparative Example 1)
Unlike the structures of Examples 1 to 3 and Reference Example 1 , an ordinary vehicle was prepared in which neither the means 61 having a heat insulation function nor the means 62 having a heat radiation function was provided.

(Comparative Example 2)
A vehicle in which only the means 61 having a heat insulating function in the first embodiment is provided on the upper body 52 is prepared.

(Comparative Example 3)
A vehicle in which only the means 62 having a heat radiation function in the first embodiment is provided in the lower body 53 is prepared.

(Comparative Example 4)
The vehicle body upper part 52 in which the position of the boundary line 51 is shifted upward and the means 61 having a heat insulating function is provided is only the roof 34, pillars and window glasses 35, 36, and 37 in the first embodiment. Furthermore, a vehicle was prepared in which infrared absorbing paint was applied to the entire interior of the door to form means 62 having a heat dissipation function.

(Comparison method)
After leaving for 3 hours from 10:00 am under an outside air condition of 35 ° C., a comparative experiment was conducted between the air temperature at the center of the room and the surface temperature of the headlining 63. The temperature measurement results are shown in FIG.

As shown in FIG. 10, with respect to the surface temperature of the headlining 63, the temperatures of Examples 1, 2, 3 and Reference Example 1 are much lower than those of Comparative Examples 1, 2, 3, 4. I understood. Furthermore, regarding the air temperature at the center of the room, it was found that the temperatures of Examples 1, 2, 3 and Reference Example 1 were sufficiently lower than those of Comparative Examples 1, 2, 3, 4. That is, both the heat insulating function and the heat radiating function can be achieved to reduce the room temperature, and furthermore, the effect is not obtained until the respective means 61 and 62 are used with the boundary line 51 defined by the present invention as a boundary. It was found that the room temperature can be sufficiently reduced.

(2. About the body panel structure used for the thermal functional structure for automobiles)
Next, a vehicle body panel structure that is used in the above-described thermal functional structure for automobiles and has a substantially vertical surface, an outer panel 31 that forms the exterior of the vehicle 100, an inner panel 32 that faces the outer panel 31, and A vehicle body panel structure including the indoor trim 33 will be described. The vehicle body panel structure according to the present invention is premised on being used in the above-described automotive thermal functional structure. For this reason, even a vehicle body panel not provided with heat dissipation means is included in the concept of the vehicle body panel structure according to the present invention. However, in this case, it is necessary to provide means 62 having a heat radiation function in the lower part 53 of the vehicle body other than the vehicle body panel based on the measurement result of Comparative Example 2 described above. For example, the means 62 having a heat radiation function provided on the floor 69 may be constituted by a heat radiation carpet 70 using a good heat conductive material. The following description focuses only on the vehicle body panel structure.

  First, the operation of the vehicle body panel structure of the present invention will be described.

  It is not uniform when examining the amount of heat received in the panel of the vehicle 100 placed under the hot sun, particularly the vertical panel. Obviously, the amount of heat is larger at the portion of the angle close to the right angle with respect to the direction of sunlight, that is, at the top. That is, heat transfer from the outer panel 31 to the vehicle compartment R occurs mainly at the upper part of the outer panel 31 that is exposed to sunlight. This form of heat transfer is radiation from the outer panel 31 to the passenger compartment R and heat transfer via air therebetween. Due to this heat transfer, the indoor temperature becomes higher than the temperature outside the vehicle. More specifically, the space and the interior surface in the upper part of the room are hotter than the space and the interior surface in the lower part. As a result, heat transfer from top to bottom occurs in the room. Even in the lower part of the room where the temperature is relatively low, the temperature is higher than the outside of the vehicle, so heat is radiated from the lower part of the room to the outside of the car. However, the heat dissipation is slight at present, and is insufficient to improve the indoor thermal environment.

  How the indoor thermal environment is improved by the present invention will be described with reference to FIG. 11 in which a cross section of the vehicle body panel structure is schematically shown.

  In the vehicle body panel structure of the present invention, first, paying attention to the outer panel 31 where the solar radiation C mainly hits and the upper part A where the interior material on the side of the vehicle compartment R facing it is located, heat treatment is performed here. It is a feature.

  Such heat insulation treatment makes it difficult for heat radiation from the part A to the outside of the vehicle, and the other parts are relatively easy to radiate heat. Although the lower part is exposed to sunlight, the lower part is weaker than the upper part, and as described above, the lower part of the room is higher than the outside of the vehicle, so that the lower part rather serves as a part B for heat dissipation. Insulating heat D is reduced by the heat insulation treatment to suppress the temperature rise in the room, particularly in the upper part A.

  At this time, a part of the heat received on the surface of the outer panel 31 by the heat insulation treatment is reflected or radiated and goes out of the vehicle, but most of the heat is generated between the outer panel 31 and the interior part itself, between the panel and the interior. It is trapped in the air, especially the air present in the upper part or upper part of the part itself. The heat that passes through the upper part A and enters the room raises the temperature of the upper part of the passenger compartment R and makes it higher than the temperature of the lower part of the passenger compartment R. Similarly, the heat stored in the air between the part itself and the panel, especially the air existing in the upper part and the upper part of the part itself raises the temperature of the upper part of the part and makes it higher than the temperature of the lower part of the part.

  Since the temperature difference is generated in this way, heat transfer E from the top to the bottom of the passenger compartment R and heat transfer F from the top to the bottom of the parts occur. Both of these come out from the bottom of the outer panel 31 (heat radiation G). By not heat-insulating the outer panel 31 and the lower part of the interior material on the side of the passenger compartment R, it is easy to radiate heat from the interior to the outside of the vehicle. It is also possible to devise so as to promote heat dissipation in the lower part.

  The heat transfer from the outside to the room can be broadly divided into two forms of radiation and heat transfer / heat conduction, and there are heat insulation methods corresponding to each. A significant increase in the indoor air temperature can be suppressed by adiabatic treatment to reduce the amount of heat transfer. Radiation depends on the surface temperature and emissivity of the outer panel 31 and the opposite surface such as the back surface of the interior. The lower the emissivity, the lower the amount of radiant heat transfer. On the other hand, in order to reduce the heat transfer / heat conduction, the heat conductivity may be lowered. This reduces the amount of heat transfer when the temperature difference is the same.

  As a method for promoting heat dissipation, any of a method for promoting heat transfer from the room to the outer panel 31, a method for promoting radiant heat transfer from the back surface of the interior to the back of the outer panel 31, and a method for promoting heat conduction of the interior itself May be employed, or these may be used in combination.

  The conventional technology exclusively considers the suppression of heat intrusion into the room, so it becomes a state that prevents heat dissipation from the room, or conversely, heat intrusion is not taken into consideration, making it easy for heat to enter. Yes. In the present invention, by performing heat insulation and heat dissipation at the same time, even when a car is left under a hot sun, the indoor thermal environment is not extremely deteriorated.

  In addition, the present invention releases the heat energy stored in the components such as the outer panel 31 and the interior itself, and the heat energy stored in the air existing between the two, which has not been considered so far. Is also an effective technique. The stored thermal energy is the heat that enters the room due to the difference in temperature between the interior of the components when the air conditioner mounted on the vehicle is operated to reduce the indoor air temperature and the interior component surface temperature. This leads to an undesirable effect for indoor comfort.

  In the present invention, the heat energy stored in the parts such as the outer panel 31 and the interior, and the heat energy stored in the air existing between them are radiated to the outside of the vehicle, thereby reducing the load on the air conditioner. be able to.

  The emissivity reduction was mentioned as the heat insulation method on the back of the outer panel 31 and the upper portion of the surface facing the outer panel 31 of the passenger compartment R. The effect will be described as follows. That is, by reducing the emissivity of the back surface of the outer panel 31, the amount of radiant heat transfer on the back surface of the outer panel 31 is reduced. The amount of radiant heat transfer decreases as the emissivity decreases. That is, it can be insulated. By reducing the emissivity of the surface facing the outer panel 31 of the passenger compartment R, it becomes difficult to absorb radiation from the back surface of the outer panel 31. That is, it can be insulated.

  The emissivity mentioned in the present invention is that of wavelengths in the range of 3 μm to 30 μm. The wavelength in the same range is the main range of light emitted from the vehicle 100 in which the outer panel 31 of the vehicle and the surface opposite to the vehicle are left under the sun. As a measuring method, for example, a method based on the standard of ASTM C 1371-98 can be used.

  Next, an embodiment of the present invention will be described.

  The outer panel 31 described in the present invention is a vehicle body structural member. The back surface of the outer panel 31 in the present invention means a surface opposite to a surface constituting the appearance of the vehicle 100. In the present invention, it is essential that there is a surface facing the back surface, and the facing surface is desirably an element constituting the passenger compartment R and a part serving as a boundary. More specifically, the interior trim 33 and / or the inner panel 32.

  The indoor trim 33 is, for example, a door trim, a door inner panel, a head lining, a pillar garnish, a door moisture-proof sheet, or the like. Here, the opposing positions are positions facing each other with a gap including air at least partially. The material of the indoor trim 33 includes at least one selected from the group consisting of polyethylene terephthalate, polypropylene, polyethylene, acrylic paper, and styrene paper. In addition, commonly used materials such as phenol resin, polyphenylene oxide resin, and wood board can be included. The inner panel 32 is at least one selected from the group consisting of steel plates and rust preventive coating.

  The outer panel 31 is at least one selected from the group consisting of a steel plate and rust preventive coating. The outer panel 31 described here includes at least one of a door panel, a pillar, a fender, a roof 34, a body side, and a trunk lid. Of particular interest are vertical outer panels 31 such as door panels, pillars, fenders, body sides, and the like.

  The vehicle body panel structure of the present invention is characterized in that the outer panel 31 and at least one of the inner panel 32 and the indoor trim 33 opposed thereto are partially insulated. The position where the heat insulation process is performed, that is, the position where the heat insulation means is provided is the vehicle body when the vehicle body 50 for partitioning the vehicle compartment R is divided into the vehicle body upper part 52 and the vehicle body lower part 53 with a substantially horizontal boundary line 51 as a boundary. Upper part 52. The concept of the vehicle body upper part 52, the vehicle body lower part 53, and the boundary line 51 is the same as that described for the thermal functional structure for automobiles.

  As one of the heat-insulating embodiments of the present invention, a film having a low emissivity surface on at least one side is provided on the back surface of the outer panel 31 and a part of the surface facing the outer panel 31 of the passenger compartment R. The form which affixes by making an emissivity surface face the opposite surface can be mentioned.

  The part to be attached is preferably the upper portion of the outer panel 31 and the indoor trim 33 facing it. The film to be pasted is aluminum foil, copper foil, aluminum foil whose surface is protected with a transparent resin layer, copper foil whose surface is protected with a transparent resin layer, resin film with aluminum attached, resin film with reflective paint applied It is desirable to include at least one of the group consisting of a resin film mixed with a reflective material and / or a white pigment.

  When the film to be attached is an aluminum foil, a copper foil, an aluminum foil whose surface is protected with a transparent resin layer, or a copper foil whose surface is protected with a transparent resin layer, the thickness is preferably 1 μm to 1000 μm, particularly 5 μm to 50 μm. is there. If the thickness is less than 1 μm, the strength is low, and it is easily damaged during handling. On the other hand, when the thickness exceeds 1000 μm, flexibility is impaired, and the workability of attaching is lowered.

  There are no particular restrictions on the type of resin film to which aluminum is attached, resin film to which a reflective paint is applied, or a resin film in which a reflective material and / or white pigment is mixed, but polyester and polyethylene are considered in consideration of heat resistance and flexibility. Etc. are suitable. The thickness of the resin film is preferably 5 μm to 100 μm for handling. The thickness for depositing aluminum is desirably in the range of 5 nm to 100 μm. This is because when the thickness is less than 5 nm, the reflection effect is not sufficient, and when it exceeds 100 μm, the cost increases. Vapor deposition is suitable as a method for attaching aluminum. As the reflective paint, one containing aluminum scale as a main component can be used. The coating thickness is preferably 10 nm to 100 μm, as is the case with aluminum deposited on the resin. This is because if the thickness is less than 10 nm, the reflection effect is not sufficient, and if it exceeds 100 μm, cracking tends to occur. The content of the reflective material and white pigment to be mixed into the resin is 0.001 to 2% by weight. If the content is 0.001% by weight or less, the transmittance is high, and even if 2% by weight or more is mixed, the film formability is difficult.

  The film is attached using an adhesive. As the adhesive, an epoxy-based adhesive, a urethane-based adhesive, a hot-melt adhesive, or the like can be used, and an epoxy-based adhesive can be given as a particularly suitable adhesive. The epoxy adhesive of the present invention contains an epoxy resin, a curing agent, and a high thermal conductivity material as main components. The epoxy resin is not particularly limited as long as it is usually used as an epoxy adhesive. Examples thereof include a bisphenol A type epoxy resin obtained from bisphenol A and epichlorohydrin. The curing agent is not particularly limited as long as it is usually used for epoxy adhesives. Examples thereof include first, second and third aliphatic polyamines, polyamides, aromatic polyamines, acid anhydrides, diamides, phenol resins, and silicones. An appropriate amount of the curing agent is selected according to the type of the epoxy resin and the curing agent.

  As another embodiment for heat insulation of the present invention, there can be mentioned a form in which a paint having a low emissivity on the coated surface is attached to the part.

  The thickness of the low radiation coating is preferably 1 to 100 μm, and more preferably 10 to 50 μm. When the coating thickness is less than 1 μm, the reduction in radiation is insufficient, and when it exceeds 100 μm, problems such as peeling of the coating may occur. Reflective materials are included as paints that can have low emissivity. As a reflector, aluminum scale is the main component. The reflective material preferably occupies 3 to 90% by mass of the entire coating material. This is because if 3% by mass or less, the content effect does not appear, and if it is 90% by mass or more, sufficient adhesion cannot be ensured.

  Vehicles used for dispersing the reflective material and / or white pigment include conventionally known acrylic resins, epoxy resins, polyamide resins, polyurethane resins, polyester resins, polybutadiene resins, and modified products of these resins. Can be mentioned. As a coating method, a known method such as spraying or dipping can be used. The thickness of the coating film is preferably 1 to 100 μm, more preferably 10 to 50 μm. This is because if the coating thickness is less than 1 μm, the function of reducing radiation becomes insufficient, and if it exceeds 100 μm, problems such as peeling of the coating may occur.

  As still another embodiment for heat insulation of the present invention, a form in which a sheet-like heat insulating material is attached to the part can be mentioned.

  The sheet-like heat insulating material is selected from the group consisting of a foamed resin sheet, a nonwoven fabric, and a woven fabric. As the foamed resin sheet, for example, a foam of 5 to 40 times the original dimensions using polypropylene, polyethylene, polystyrene, or polyurethane is suitable, and examples thereof include Slim Ace manufactured by Furukawa Electric Co., Ltd. Examples of the nonwoven fabric include Thinsulate manufactured by Sumitomo 3M Limited.

  The boundary between the part that imparts the heat insulation function and the part that imparts the heat radiation function is the upper and lower sides centering on the boundary line 51 formed by connecting the points formed by the tangent line of the surface and the ground surface of the outer panel 31 to 90 °. It is preferably within a width of 15 cm. The above-mentioned ground refers to a state in which the car is not tilted on a flat ground. Above the point where the angle formed by the ground surface and the tangent to the surface of the outer panel 31 is 90 °, it is easy to receive solar radiation, and below it is in a position facing the ground surface, which is suitable as a heat radiation part. The reason why the height is 15 cm above and below the boundary is in consideration of the ease of the heat insulation treatment, the situation where the car is placed, and the shape of the car. If the boundary is higher than 15 cm, heat penetration due to solar radiation is large and heat radiation cannot catch up. On the contrary, if it is below 15 cm of the boundary, heat intrusion due to solar radiation can be sufficiently prevented, but heat radiation is difficult. In addition, when there are a plurality of the boundary lines 51, it is desirable to use the boundary line 51 closest to the ground as a reference line for providing a heat insulating function and a heat radiating function. This is because it is important to suppress heat intrusion first.

  Embodiments to which the heat insulating function described so far is given are shown in FIGS. 12 to 14 using schematic views of a cross section of a door structure including an outer panel 1, an inner panel 2, and a door trim 3. In addition, the code | symbol "4" in the figure has shown the side glass glass.

  As already described, at least one of the back surface of the outer panel 1, the both surfaces of the inner panel 2, and the surface of the door trim 3 facing the outer panel 1 is partially provided with heat insulating means for heat insulation, and partially Insulated.

  FIG. 12 (A) shows an embodiment in which a high reflectivity material 5 is applied to the upper part of the back surface of the outer panel 1 and partially heat-insulated.

  FIG. 12B shows an embodiment in which the high reflectivity material 5 is applied to the upper part of the surface (front surface) of the inner panel 2 facing the outer panel 1 and partially heat-insulated.

  FIG. 12C shows an embodiment in which the high reflectivity material 5 is applied to the upper part of the back surface of the inner panel 2 and partially heat-insulated.

  FIG. 12D shows an embodiment in which the high reflectivity material 5 is applied to the upper portion of the surface (back surface) facing the outer panel 1 of the door trim 3 and partially heat-insulated.

  Furthermore, FIG. 13 (A) shows an embodiment in which a high reflectivity material 5 is applied to each of the upper part of the back surface of the outer panel 1 and the upper part of the surface of the inner panel 2 and is partially heat-insulated.

  FIG. 13B shows an embodiment in which the high reflectivity material 5 is applied to each of the upper part of the rear surface of the outer panel 1 and the upper part of the rear surface of the door trim 3 and is partially heat-insulated.

  FIG. 13C shows an embodiment in which a high reflectivity material 5 is applied to each of the upper part of the back surface of the outer panel 1, the upper surface of the inner panel 2 surface, and the upper part of the back surface of the door trim 3, and is partially heat-insulated. .

  The heat insulation means to be used is not limited to one type, and a plurality of types of heat insulation means may be used in combination. The embodiment is shown in FIGS. 14 (A) and 14 (B).

  FIG. 14 (A) shows an embodiment in which a sheet-like heat insulating material 6 is pasted on the upper surface of the outer panel 1 and a high reflectivity material 5 is applied on the upper surface of the inner panel 2 and partially heat-insulated. It is.

  FIG. 14B shows an embodiment in which the sheet-like heat insulating material 6 is attached to the upper part of the back surface of the outer panel 1 and then the high reflectivity material 5 is applied and partially heat-insulated.

  In said embodiment, the boundary line which connects the point which the angle | corner made by the tangent 7 in the surface of the outer panel 1 and the ground becomes 90 degrees between the site | part which provides a heat insulation function, and the site | part which provides a heat dissipation function. 8, a space above the horizontal line 9 including the boundary line 8 is a heat-insulating side 10 for heat penetration, and a space below the horizontal line 9 is a heat-dissipating side 11. However, the boundary between the part that imparts the heat insulating function and the part that imparts the heat dissipation function may be within a width of 15 cm above and below the boundary line 8.

  In FIG. 15, the high reflectivity material 5 is used as the outer panel 1 up to 10 cm below the boundary line 8 formed by connecting the points where the angle between the tangent line 7 on the surface of the outer panel 1 and the ground is 90 °. The embodiment given to the back side of is shown. Although heat radiation occurs in the lower part where the heat insulation treatment is not performed, a treatment for promoting the heat radiation may be performed.

As a reference example 2 that promotes heat dissipation according to the present invention, as shown in FIG. In this embodiment, heat transfer is promoted by integrally connecting the heat flow in the cross-sectional direction of the outer panel 1 from the interior air to the trim surface, the trim interior, and the trim interior. The position of the vent hole 12 is preferably a position adjacent to the lower part where the heat transfer E from the top to the bottom described in FIG. The role of the air vent 12 is to facilitate heat dissipation by allowing the air in the lower part of the room to come into contact with the outer panel 1 or the inner panel 2 from the trim 3, and the shape, size and number are the design characteristics of the trim 3. Satisfy other requirements such as safety and safety. Further, the vent hole 12 may be provided in the inner panel 2 in addition to the trim 3. This is because heat transfer can be promoted.

  As another embodiment for promoting heat dissipation according to the present invention, as shown in FIG. 16 (B), a surface coated on the back surface of the outer panel 1 and at least one surface of the trim 3 facing the outer panel 1. The form which adhered the coating material in which the emissivity of far-infrared region becomes 0.7 or more can be mentioned. Heat dissipation by radiation can be promoted by increasing the emissivity. If it is 0.7 or less, sufficient radiant heat transfer cannot be expected. The paint to be applied by painting with an emissivity of 0.7 or more in the far infrared region is composed of at least one selected from the group consisting of zirconium oxide, alumina, zircon, titania, aluminum titanate, cordierite, and aluminum silicate. A high emissivity material 13 is included. It is desirable that the high emissivity material 13 occupies 0.3 to 10% by mass of the entire paint. This is because the inclusion effect does not appear at 0.3% by mass or less, and sufficient adhesion cannot be ensured at 10% by mass or more. Examples of the vehicle used for dispersing the high emissivity material 13 include conventionally known acrylic resins, epoxy resins, polyamide resins, polyurethane resins, polyester resins, polybutadiene resins, and modified products of these resins. . As a coating method, a known method such as spraying or dipping can be used. The thickness of the coating film is preferably 1 to 100 μm, more preferably 10 to 50 μm. This is because if the coating thickness is less than 1 μm, the function of reducing radiation becomes insufficient, and if it exceeds 100 μm, problems such as peeling of the coating may occur.

  As still another embodiment for promoting heat dissipation according to the present invention, as shown in FIG. 16C, a form in which the good thermal conductivity material 14 is included in the trim 3 can be exemplified. The heat conductivity of the trim 3 itself is increased to promote heat transfer inside the trim among the heat flow from the room air to the trim surface, inside the trim, and inside the trim in the cross-sectional direction of the outer panel 1. As described above, the trim 3 itself includes commonly used materials such as polyethylene terephthalate, polypropylene, polyethylene, acrylic paper, styrene paper, phenol resin, polyphenylene oxide resin, and wood board. At most, it is as low as 0.5 W / m / K or less. Here, what is referred to as a good heat conductor is a material having a thermal conductivity of 10 W / m / K or more, and is generally a resin, a metal, a high thermal conductivity ceramic, carbon fiber, graphite or the like and a resin composite containing them as a filler. The body is a good heat conductor. As a method for inclusion in the trim 3, a method in which the good thermal conductivity material 14 is made into a sheet or net shape and is included by an insert molding method is desirable. The good thermal conductivity material 14 desirably covers at least the heat radiation portion of the trim, and more desirably extends to the heat insulation portion. This is because, before the heat passing through the heat insulating portion passes through the trim and reaches the room, the heat can be transferred to a lower temperature portion by heat conduction.

  In order to obtain a further desirable effect, one end of the good conductor may be directly fastened to the outer panel 1, the inner panel 2, or a metal part for fastening them. As a method for joining the good heat conductor and the vehicle body panel, normal screwing, fastening with bolts / nuts, welding, or adhesion can be used. Thereby, heat conduction other than the cross-sectional direction described above can be further promoted. In the case of selecting a fastening method, in view of the spirit of the present invention aiming at thermal conduction, the heat conduction for securing the thermal conductivity by taking as large an area of the fastening part as possible or filling the gap of the fastening part. It does not hinder the means such as using auxiliary sealing material or paste.

  In this way, the heat transfer amount entering the vehicle compartment R from the outer panel 1 by insulating the upper surface of at least one of the back surface of the outer panel 1, both surfaces of the inner panel 2, and the surface of the interior 3 facing the outer panel 1. Can be reduced. Thereby, the temperature rise of the compartment R can be suppressed. Furthermore, by disposing the above heat insulation treatment or providing a portion that can actively promote heat dissipation in the lower part, heat dissipation from the indoor air to the outside of the vehicle via the indoor trim 3 and the outer panel 1 is promoted. The At the same time, heat release from the interior of the interior trim 3, the outer panel 1, and the heat held by the air between the two is promoted. As a result, it is possible to provide the vehicle 100 that can promote indoor temperature comfort.

  Next, although the Example of this invention is described, it cannot be overemphasized that this invention is not limited only to such an Example.

(Common part of Example)
The following evaluation device was created that mimics the outer panel 1 and the interior space. FIG. 17 shows a schematic diagram.

  A heat insulating box 15 having a space of 30 cm in length, 30 cm in width, and 50 cm in depth was prepared so that it had an outer shape of 50 cm in length, 50 cm in width, and 60 cm in depth and had a thickness of 10 cm. The internal space 16 of the heat insulation box 15 imitates the interior space R of the vehicle compartment.

  Panel 17 (heat conductivity) made of a polypropylene (PP) resin plate having a thickness of 50 mm and a width of 50 cm and imitating a trim 3 so as to cover the opening (length 30 cm × width 30 cm) of the heat insulation box 15 without gaps. : 0.5 W / m · K). On the panel 17, a spacer heat insulating material 18 having an external shape of 50 cm in length, 50 cm in width, and 10 cm in depth and having a thickness of 10 cm and having a hollow of 30 cm in length, 30 cm in width, and 10 cm in depth is placed inside. Thus, a space corresponding to the space between the interior and the outer panel 1 was provided in the test apparatus.

  A panel 19 having a length of 50 cm and a width of 50 cm and imitating the outer panel 1 was covered on the spacer heat insulating material 18 so as to cover the opening (length 30 cm × width 30 cm) without any gap. On the panel 19, a spacer heat insulating material 20 having an outer shape of 50 cm in length, 50 cm in width, and 10 cm in depth and having a thickness of 10 cm and having a hollow of 30 cm in length, 30 cm in width, and 10 cm in depth is placed inside.

  The panel 19 was adjusted as follows. A 35 cm × 35 cm × 0.8 mm thick iron test piece that had been degreased and subjected to chemical conversion treatment was dip-coated on Power Top V6 (manufactured by Nippon Paint Co., Ltd., gray color electrodeposition paint), washed with water and baked at 150 ° C. The dry film thickness of the electrodeposition coating film (primer layer front and back) was 20 μm.

  Next, Olga P-28101 (manufactured by Nippon Paint Co., Ltd., intermediate coating) is spray-coated on one surface of the coating film, and Olga P-2-1 202B (manufactured by Nippon Paint Co., Ltd., top-coating paint) is further sprayed thereon. Then, simultaneous baking was performed at 150 ° C. to form a multilayer coating film. This test piece was used as a panel 19 corresponding to the outer panel 1. The panel 19 was installed with the side on which the multilayer coating film was formed facing outward. The dry film thicknesses of the intermediate coating film and the top coating film were both 40 μm.

  In each of the following examples, the panel 17 and the panel 19 are subjected to a heat insulation process and, if necessary, a heat dissipation process.

  FIG. 18 shows a list of heat insulation sites and heat insulation techniques in the examples and comparative examples, and FIG. 19 shows a list of heat radiation sites and heat dissipation techniques in the examples and comparative examples.

(Example 1)
In Example 1, the upper half (15 cm in length × 30 cm in width) on the surface facing the panel 19 out of both surfaces of the panel 17 was used as the heat insulating portion. A 12 μm thick PET film (manufactured by Unitika Co., Ltd., product name: emblet, model number: MP12), which was subjected to Al vapor deposition treatment on one side, was attached to this heat insulating part with an epoxy resin adhesive to make a heat insulating method. . The emissivity of the attached film is 0.05.

  The lower half (length 15 cm × width 30 cm) of the surface of the panel 17 facing the panel 19 was used as a heat radiation part. The heat radiating method was that the heat radiating portion was not subjected to heat insulation. That is, in Example 1, the heat dissipation technique was to not attach a 12 μm thick PET film with Al vapor deposition treatment on one side to the lower half.

  In addition, also in the following Example 2 to Example 12, the heat insulation treatment is performed only partially (the upper half of the panel 17 and / or the panel 19), and the heat radiation portion (the lower half of the panel 17) is not subjected to the heat insulation treatment. This was the heat dissipation method.

(Example 2)
In Example 2, an Al foil having a thickness of 5 μm was used instead of the PET film having a thickness of 12 μm having the Al vapor deposition surface of Example 1. The emissivity of the pasted Al foil is 0.05. The same procedure as in Example 1 was performed except that an Al foil was attached.

(Example 3)
In Example 3, instead of the PET film having a thickness of 12 μm having the Al deposited surface of Example 1, 10 parts by weight of an aluminum pigment (Leafing Aluminum Paste, manufactured by Toyo Aluminum Co., Ltd.) and an oil-free polyester resin varnish (Dainippon Ink) Chemical Industry Co., Ltd. (solid content 60%) 5 parts by weight and polyisocyanate resin (Japan Polyurethane Industry Co., Ltd., solid content 70%) 1 part by weight are mixed and dispersed, and further diluted with a solvent to adjust the viscosity. A 25 μm thick PET film (manufactured by Unitika Ltd., trade name: emblet, model number: S25), which was spray-coated so that the dry film thickness was uniformly 20 microns, was used. The emissivity of this coating film is 0.10, and the thickness of the adhesive layer is 15 μm. The same procedure as in Example 1 was performed except that an Al-containing paint coating film was attached.

Example 4
In Example 4, instead of pasting the 12 μm thick PET film having the Al deposited surface of Example 1, 10 parts by weight of an aluminum pigment (leafing aluminum paste, manufactured by Toyo Aluminum Co., Ltd.) and an oil-free polyester resin varnish 5 parts by weight (manufactured by Dainippon Ink & Chemicals, Inc., solid content 60%) and 1 part by weight of polyisocyanate resin (manufactured by Nippon Polyurethane Industry Co., Ltd., solids 70%) are mixed and dispersed, and further diluted with a solvent. The one whose viscosity was adjusted was spray-applied uniformly so as to have a dry film thickness of 20 μm. The emissivity of this coating film is 0.10, and the thickness of the adhesive layer is 15 μm. The same procedure as in Example 1 was performed except that an Al-containing paint was applied.

(Example 5)
In Example 5, the upper half (15 cm long × 30 cm wide) of the surface of the panel 19 facing the panel 17 was used as a heat insulating part. Similar to Example 1, a PET film having a thickness of 12 μm and having an Al vapor deposition surface was attached to this heat insulating portion with an epoxy resin adhesive.

(Example 6)
In Example 6, the upper half (15 cm × 30 cm) of the surface of the panel 17 facing the panel 19 and the upper half of the surface of the panel 19 facing the panel 17 (15 cm × 30 cm) Both were made into heat insulation parts. In the same manner as in Example 1, these heat insulating portions were subjected to Al vapor deposition treatment on one side, and a PET film having a thickness of 12 μm (manufactured by Unitika Ltd., trade name: emblet, model number: MP12) and an epoxy resin adhesive Pasted with. The same procedure as in Example 1 was performed except that the PET film was also attached to the upper half of the panel 19.

(Example 7)
In Example 7, 70% (21 cm long × 30 cm wide) from the top of the entire surface of the panel 17 was used as the heat insulating portion. In the same manner as in Example 1, a 12 μm thick PET film (product name: Emblet, model number: MP12) manufactured by Unitika Co., Ltd. was coated with an epoxy resin adhesive. Pasted. Example 1 was repeated except that the area covered with the PET film was increased.

(Example 8)
In Example 8, instead of the 12 μm thick PET film having the Al vapor deposition surface of Example 1, a sheet-like PP foam material having a thickness of 1 mm (Furukawa Electric Co., Ltd., trade name: Slim Ace, expansion ratio) : 30 times). Example 1 was performed except that a sheet-like PP foam material having a thickness of 1 mm was attached.

Example 9
In Example 9, it was carried out similarly to Example 8 except sticking a sheet-like PP foam material (made by Sekisui Chemical Co., Ltd., product name: Softlon, foaming ratio: 20 times) having a thickness of 2 mm.

(Example 10)
In Example 10, instead of the sheet-like foamed material of Example 8 and Example 9, a 10 mm thick nonwoven fabric (manufactured by Sumitomo 3M Limited, trade name: cinsalate) was used. Example 8 and Example 9 were carried out except that a nonwoven fabric having a thickness of 10 mm was attached.

(Example 11)
In Example 11, Al vapor deposition treatment was performed on one side of the sheet-like PP foam material of Example 8 having a thickness of 1 mm (manufactured by Furukawa Electric Co., Ltd., product name: Slim Ace, expansion ratio: 30 times). A 12 μm thick PET film (manufactured by Unitika Ltd., product name: emblet, model number: MP12) was further attached. Example 8 was repeated except that a PET film having a thickness of 12 μm was further adhered.

(Example 12)
In the twelfth embodiment, as in the sixth embodiment, the upper half (15 cm × 30 cm) of the surface of the panel 17 facing the panel 19 and the upper half of the surface of the panel 19 facing the panel 17 (vertical). 15 cm × 30 cm wide) was used as the heat insulating part. However, in the upper half of the opening of the panel 19, instead of a PET film having a thickness of 12 μm, a sheet-like PP foam material having a thickness of 1 mm (manufactured by Furukawa Electric Co., Ltd., trade name: Slim Ace, foaming ratio: 30 times). The same procedure as in Example 6 was performed except that the heat insulating material attached to the upper half of the panel 19 was changed.

( Reference Example 3 )
In Reference Example 3 , as in Example 1, the upper half (length 15 cm × width 30 cm) of the surface of the panel 17 opposite to the panel 19 is used as a heat insulating portion, and Al vapor deposition treatment is performed on one surface of the heat insulating portion. The 12-μm-thick PET film (product name: emblet, model number: MP12) applied was pasted with an epoxy resin adhesive to obtain a heat insulation method.

In the following Reference Examples 4 to 6 , the same heat insulating part and heat insulating method as those of Reference Example 3 were used.

  Similarly to the first embodiment, the lower half (15 cm long × 30 cm wide) of the surface of the panel 17 opposite to the panel 19 is used as a heat radiating portion. Ten holes having a diameter of 0.5 mm are formed in this portion. Opening (2 stages × 5 pieces at equal intervals) and providing these vent holes was the heat dissipation method.

( Reference Example 4 )
In Reference Example 4 , as in Example 1, the lower half (15 cm in length × 30 cm in width) on the surface facing panel 19 among the both surfaces of panel 17 was used as the heat radiation site. In this heat radiation part, 10 parts by weight of zirconium oxide, 5 parts by weight of oil-free polyester resin varnish (manufactured by Dainippon Ink and Chemicals, 60% solid content) and polyisocyanate resin (manufactured by Nippon Polyurethane Industry Co., Ltd., 70% solids) ) 1 part by weight was mixed and dispersed, and further diluted with a solvent to adjust the viscosity, and spray-coated uniformly to a dry film thickness of 20 μm. The emissivity of this coating film is 0.89. The same procedure as in Example 1 was performed except that high emissivity coating was applied as a heat dissipation method.

( Reference Example 5 )
In Reference Example 5 , both the entire surface of the panel 17 facing the panel 19 (length 30 cm × width 30 cm) and the lower half of the surface of the panel 19 facing the panel 17 (length 15 cm × width 30 cm). Was defined as a heat dissipation site. The paint used in Example 14 was applied to these heat radiation sites. The same procedure as in Reference Example 4 was performed except that the high emissivity coating was applied to the upper half of the panel 17 and the lower half of the opening of the panel 19.

( Reference Example 6 )
In Reference Example 6 , the entire panel 17 (30 cm long × 30 cm wide) opposed to the panel 19 was used as a heat radiation site. The panel 17 was replaced with a sandwich of a 0.2 mm thick iron plate (thermal conductivity 60.5 W / m · K) between two 0.4 mm thick PP resin plates. The emissivity of the coated part is 0.84. The same procedure as in Reference Example 5 was performed except that the structure of the heat radiation portion and the panel 17 was modified.

(Comparative Example 1)
As Comparative Example 1, a product that did not perform both heat insulation treatment and heat radiation treatment was produced.

(Comparative Example 2)
In Comparative Example 2, with respect to Examples 1 and 7, the entire surface (30 cm long × 30 cm wide) facing the panel 19 out of both surfaces of the panel 17 was used as the heat insulating part. In the same manner as in Examples 1 and 7, a 12 μm thick PET film (manufactured by Unitika Ltd., product name: emblet, model number: MP12) was bonded to this heat insulating portion with an epoxy resin. Pasted with an agent.

(Comparative Example 3)
In Comparative Example 3, as compared with Example 5, the entire surface of panel 19 facing panel 17 (vertical 30 cm × horizontal 30 cm) was used as the heat insulating part. Similar to Examples 5 and 6, a 12 μm thick PET film (manufactured by Unitika Ltd., product name: emblet, model number: MP12) was bonded to this heat insulating part with an epoxy resin. Pasted with an agent.

(Comparative Example 4)
In Comparative Example 4, as compared with Example 8, the entire surface (30 cm long × 30 cm wide) facing the panel 19 of both surfaces of the panel 17, that is, the entire opening of the panel 17 was used as a heat insulating part. Similarly to Example 8, a sheet-like PP foam material having a thickness of 1 mm (manufactured by Furukawa Electric Co., Ltd., trade name: Slim Ace, foaming ratio: 30 times) was attached to this heat insulating portion.

(Evaluation methods)
The test apparatus in which the panels 17 and 19 were stacked as described above was placed sideways so that the panels 17 and 19 were along the vertical direction. The solar lamp 21 (manufactured by Celic Corporation, artificial solar lamp Solax 500) is inclined at an angle of 45 ° with respect to the panel 19, the lower end of the solar lamp 21 is positioned at the upper part of the spacer heat insulating material 20, and the spacer heat insulating material 20 It arrange | positioned in the position 50 cm away. The solar lamp 21 was irradiated for 120 minutes so that the intensity of light at the center of the panel 19 was 1000 W / m 2. Then, on the center line (15 cm from the end) of the surface (30 cm × 30 cm) of the panel 17 on the inner space 16 side at the time of irradiation for 120 minutes, the surface temperature at a position 5 cm from the top and the surface temperature at a position 25 cm from the top Was measured. Furthermore, each air temperature at a position 10 cm away from each position (5 cm from the top, 25 cm from the top) toward the internal space 16 was also measured.

The measurement results of Examples , Reference Examples and Comparative Examples are shown in FIG. In this chart, the position 5 cm from the top is described as “upper”, and the position 25 cm from the top is described as “lower”.

As is clear from the comparison between the measurement results in each Example and Reference Example and the measurement results in each Comparative Example, the temperature at the same position is higher in each Example and Reference Example than in each Comparative Example . It was much lower.

  For example, when Example 1 in which the upper half of the panel 17 corresponding to the trim is heat-insulated and the lower half is heat-dissipated is compared with Comparative Example 1 in which heat-insulation and heat-dissipation are not performed, in Example 1, Compared to Comparative Example 1, the upper and lower surface temperatures and the upper and lower air temperatures could be reduced by 23.1 ° C., 16.5 ° C., 22.2 ° C., and 17.8 ° C., respectively.

  When Example 1 is compared with Comparative Example 2 in which the entire panel 17 is thermally insulated and heat dissipation is not performed, the upper and lower surface temperatures, upper and lower surface temperatures are higher in Example 1 than in Comparative Example 2. Each of the air temperatures could be reduced by 12.9 ° C, 9.9 ° C, 12.2 ° C, and 9.4 ° C.

  Comparing Example 7 in which 70% from the top of the panel 17 was heat-insulated and heat-dissipated 30% in the bottom was compared with Comparative Example 2, in Example 7, compared to Comparative Example 2, the upper and lower parts were compared. The surface temperature and the upper and lower air temperatures could be reduced by 15.3 ° C, 14.7 ° C, 16.7 ° C and 13.2 ° C, respectively.

  Example 5 in which the upper half of the panel 19 corresponding to the outer panel 1 is heat-insulated and the lower half of the panel 17 is heat-dissipated, and Comparative Example 3 in which the entire panel 19 is heat-insulated and not heat-dissipated In Example 5, compared with Comparative Example 3, the upper and lower surface temperatures and the upper and lower air temperatures were 13.1 ° C., 11.3 ° C., 12.3 ° C., 10. It was reduced by 5 ° C.

  When Example 6 in which the upper half of the panel 17 and the panel 19 was thermally insulated and the lower half of the panel 17 was subjected to heat radiation was compared with the comparative example 3, the upper part in the example 6 was higher than the comparative example 3. The surface temperature of the lower part and the air temperature of the upper part and the lower part can be reduced by 12.6 ° C., 11.2 ° C., 11.9 ° C., and 10.5 ° C., respectively.

  Although the comparison between Example 1 and Comparative Example 2 is similar to Example 8 and Comparative Example 4 in which the heat insulation method is changed to a form in which a sheet-like PP foam material having a thickness of 1 mm is pasted, Example 1 8, the upper and lower surface temperatures and the upper and lower air temperatures could be reduced by 17.6, 13.9 ° C., 17.0 ° C., and 13.9 ° C., respectively, as compared with Comparative Example 4.

  According to the above, it is possible to promote the indoor temperature comfort by suppressing the intrusion of heat from the portion of the outer panel 1 that is easily heat-received into the passenger compartment R and promoting the heat radiation from the passenger compartment R to the outside. The effect of the invention was confirmed.

  INDUSTRIAL APPLICABILITY The present invention can be applied to an application for improving the indoor temperature environment when parked under a hot sun.

It is a conceptual diagram which shows the heat-transfer form at the time of parking of a general vehicle. It is a conceptual diagram which shows the heat-transfer form at the time of parking of a general vehicle. It is a conceptual diagram which shows the heat-transfer form at the time of parking of a general vehicle. It is a figure which uses for description of the thermal functional structure for motor vehicles concerning the present invention, and is a longitudinal section which looked at the body from the front. BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows the thermal function structure for motor vehicles based on embodiment and Example 1, and represents the vehicle body in the longitudinal cross-section seeing from the front. It is a schematic sectional drawing which shows the door structure of Example 1. It is a figure where it uses for description of the reference example 1 of this invention. It is a figure where it uses for description of Example 2 of this invention. It is a figure where it uses for description of Example 3 of this invention. It is a graph which shows the temperature measurement result in the comparison experiment of the air temperature of a room center, and the surface temperature of a headlining. It is sectional drawing which shows typically the vehicle body panel structure with which it uses for description of the improvement of the indoor thermal environment by this invention. FIG. 12A is a schematic cross-sectional view showing an embodiment in which a high-reflectance material is provided on the upper part of the outer panel back surface, and FIG. 12B is an upper part of the surface (front surface) facing the outer panel of the inner panel. FIG. 12C is a schematic cross-sectional view showing an embodiment in which a high-reflectance material is applied, FIG. 12C is a schematic cross-sectional view showing an embodiment in which a high-reflectance material is applied to the upper portion of the back surface of the inner panel, It is a schematic sectional drawing which shows embodiment which provided the high reflectance material to the upper part of the surface (back surface) facing the outer panel of a door trim. FIG. 13A is a schematic cross-sectional view showing an embodiment in which a high-reflectance material is applied to each of the upper portion of the outer panel back surface and the upper portion of the inner panel surface, and FIG. 13B shows the upper portion of the outer panel back surface and the door trim. FIG. 13C is a schematic cross-sectional view showing an embodiment in which a high-reflectivity material is applied to each of the upper portions of the back surface, and FIG. 13C shows a high reflectivity for each of the upper portion of the outer panel back surface, the upper portion of the inner panel surface, and the upper portion of the door trim back surface. It is a schematic sectional drawing which shows embodiment which provided the material. FIG. 14A is a schematic cross-sectional view showing an embodiment in which a sheet-like heat insulating material is attached to the upper portion of the outer panel back surface, and a high reflectivity material is applied to the upper portion of the inner panel surface, and FIG. It is a schematic sectional drawing which shows embodiment which provided the high reflectance material after sticking a sheet-like heat insulating material on the upper part of the panel back surface. It is a schematic sectional drawing which shows embodiment which provided the high reflectance material as a heat insulation means to 10 cm below the boundary line which connects the point which makes the angle | corner which the tangent in the surface of an outer panel and the ground make 90 degrees. FIG. 16A is a schematic cross-sectional view showing Reference Example 2 in which a vent is provided as a heat dissipation means at the lower part of the trim or inner panel, and FIG. 16B is a lower part of the inner panel surface or the lower part of the door trim back surface. FIG. 16C is a schematic cross-sectional view showing an embodiment in which a paint having an emissivity in the far-infrared region of 0.7 or more on the applied surface is attached. FIG. 16C is an implementation in which a good thermal conductivity material is included in the trim. It is a schematic sectional drawing which shows a form. It is sectional drawing which shows the evaluation apparatus which imitated the outer panel and indoor space. It is a graph which shows the heat insulation site | part and heat insulation method in an Example , a reference example, and a comparative example by a list. It is a table | surface which shows the heat dissipation site | part and heat dissipation method in an Example , a reference example, and a comparative example by a list. It is a graph which shows the measurement result of an Example , a reference example, and a comparative example.

Explanation of symbols

1, 31 outer panel,
2, 32 Inner panel,
3, 33 Indoor trim,
4 Glass,
5 high reflectivity material,
6 Sheet insulation,
7 Tangent,
8 border,
12 Vents,
13 High emissivity material,
14 Good thermal conductivity material,
15 Insulation box,
16 Car room simulation space,
17 Trim equivalent panel,
18 Spacer insulation,
19 Outer panel equivalent panel,
20 spacer-like insulation
21 Sunlight,
DESCRIPTION OF SYMBOLS 30 Door structure 34 Roof 35 Windshield 36 Side glass 37 Rear glass 38 Instrument panel 39 Rear parcel shelf 40 Seat 40a Seat seat surface 50 Car body 51 Boundary line 52 Car body upper part 53 Car body lower part 54 Door panel upper end 55 Side sill lower end 56 Ground surface 57 Vertical line 58 Vertical line 58a Approximate center position in the vertical line 58b Position of 20% to 60% in length ratio from the lower end of the side sill to the full length of the vertical line 61 Means having heat insulation function 62 Means having heat radiation function 64 Reflective heat insulation material 65 Reflective material 66 Thermal insulation material 67 Infrared absorbing paint (paint with high emissivity in the far infrared region)
68 Mesh structure 69 Floor 70 Heat radiating carpet 71 Heat collecting plate 72 Heat pipe 73 Heat sink R Car compartment

Claims (32)

The car body for compartment formation is divided into two parts, the upper part of the car body and the lower part of the car body, with a substantially horizontal boundary as the boundary, and the upper part of the car body reduces heat input from the part directly receiving solar radiation The vehicle body lower portion whose temperature is relatively low with respect to the vehicle body upper portion communicates heat outside the vehicle compartment from the vehicle body upper portion to the vehicle body lower portion. A thermal functional structure for automobiles provided with means having a heat radiation function for promoting heat radiation to the outside of the passenger compartment by transferring heat without any heat.   2. The thermal functional structure for an automobile according to claim 1, wherein the boundary line is set at a substantially central position in a vertical line connecting the upper end of the door panel and the lower end of the side sill with a vertical line from the ground surface.   The boundary line is a vertical line connecting the upper end of the door panel and the lower end of the side sill with a vertical line from the ground surface, and the length ratio is 20% to 60% upward from the lower end of the side sill with respect to the entire length of the vertical line. The thermal functional structure for an automobile according to claim 1, wherein the thermal functional structure is configured as follows.   The thermal functional structure for an automobile according to claim 1, wherein the boundary line is included in either the upper part of the vehicle body or the lower part of the vehicle body.   The thermal functional structure for an automobile according to claim 1, wherein one or a plurality of the boundary lines are set.   2. The thermal functional structure for an automobile according to claim 1, wherein the means having a thermal insulation function includes at least one of a thermal insulation glass and / or a heat ray reflective glass and a thermal insulation material. 2. The thermal functional structure for an automobile according to claim 1, wherein the means having a heat radiation function includes any one of a high thermal conductivity material and a high radiation material.   The upper part of the vehicle body provided with the means having the heat insulating function is a roof, A, B, C, D pillar, windshield, side glass, rear glass, an upper part of the door structure located above the boundary line, the boundary 2. The automobile heat according to claim 1, comprising at least one of an upper part of a rear fender located above a line and an upper part of a rear hatch door located above the boundary line. Functional structure.   The lower part of the vehicle body provided with the means for dissipating heat is a floor, a lower part of a door structure located below the boundary line, a lower part of a rear fender located below the boundary line, and the boundary 2. The thermal functional structure for an automobile according to claim 1, comprising at least one of lower portions of a rear hatch door located below the line. 3. The upper part of the vehicle body includes a roof,
2. The thermal functional structure for an automobile according to claim 1, wherein the means having the heat insulating function provided on the roof is formed of a reflective heat insulating material. The upper part of the vehicle body is the A, B, C, D pillar, the upper part of the door structure located above the boundary line, the upper part of the rear fender located above the boundary line, and the upper side of the boundary line. Including at least one of the top of the rear hatch doors located,
The means having a heat insulating function provided in these is composed of a reflective material installed on the vehicle compartment side of the outer panel constituting the exterior of the vehicle and / or on the outer side of the inner panel opposite to the outer panel. The thermal functional structure for automobiles according to claim 1.   The means having the heat insulating function provided at the upper part of the door structure, the upper part of the rear fender, or the upper part of the rear hatch door is characterized in that a reflective heat insulating material is further installed on the vehicle exterior side of the indoor trim. The thermal functional structure for automobiles according to claim 11. The vehicle body upper part includes at least one of a windshield, a side glass, and a rear glass,
2. The automobile heat according to claim 1, wherein the means having a heat insulating function provided in these includes a glass material having at least one of a heat ray absorbing function and a heat ray reflecting function. Functional structure. The lower part of the vehicle body includes a lower part of a door structure located below the boundary line, a lower part of a rear fender located lower than the boundary line, and a lower part of a rear hatch door located lower than the boundary line Including at least one of
The thermal functional structure for an automobile according to claim 1, wherein the means having a heat radiation function provided in these is composed of a paint having a high emissivity in a far infrared region. The lower part of the vehicle body includes a floor,
The thermal functional structure for an automobile according to claim 1, wherein the means having the heat radiation function provided on the floor is constituted by a heat radiation carpet using a highly heat conductive material. The lower part of the vehicle body includes a floor,
The means having a heat dissipation function provided on the floor includes a heat sink provided on the floor, and a heat pipe that performs heat transport between the heat sink from an instrument panel and / or a rear parcel shelf, and the heat sink. The automotive thermal functional structure according to claim 1, wherein the thermal functional structure is configured to dissipate heat from the vehicle.   The vehicle body is a vehicle body side portion provided with an outer panel that constitutes the exterior of the vehicle, an inner panel and an indoor trim facing the outer panel, and the vehicle body side portion is divided into an upper body portion and a lower body portion, The heat insulating means is provided on at least one surface of the rear surface of the outer panel at the upper part of the vehicle body, the rear surface of the inner panel, both surfaces of the inner panel, and the surface of the indoor trim facing the outer panel. Item 2. The thermal functional structure for automobile according to Item 1.   A reflective material is provided on the vehicle body side of the vehicle body side on the vehicle interior side of the outer panel and on the vehicle exterior side of the inner panel, and multiple reflections are performed between the inner panel and the outer panel, so that heat is transmitted to the vehicle body. The thermal functional structure for an automobile according to claim 17, wherein the thermal functional structure is transmitted to a lower part.   19. The thermal functional structure for an automobile according to claim 17, wherein the heat insulating unit is configured by attaching a low emissivity film having a low emissivity in the far infrared region with an adhesive.   The low emissivity film was coated with an aluminum foil, a copper foil, an aluminum foil whose surface was protected with a transparent resin layer, a copper foil whose surface was protected with a transparent resin layer, a resin film with aluminum attached, and a reflective paint. The thermal functional structure for an automobile according to claim 19, comprising at least one of a group consisting of a resin film, a reflective material and / or a resin film mixed with a white pigment.   The thermal functional structure for an automobile according to claim 17 or 18, wherein the heat insulating means is configured to be painted to reduce the emissivity in the far infrared region of the coated surface.   The thermal functional structure for an automobile according to claim 21, wherein the coating applied by coating for reducing the emissivity in the far-infrared region includes aluminum scales.   The thermal functional structure for an automobile according to claim 17 or 18, wherein the heat insulating means is configured by attaching a sheet-like heat insulating material.   The thermal functional structure for automobile according to claim 23, wherein the sheet-like heat insulating material is selected from the group consisting of a foamed resin sheet, a nonwoven fabric, and a woven fabric.   The boundary between the part that imparts the heat insulating function and the part that imparts the heat radiation function is 15 cm above and below the boundary line formed by connecting a point where the angle between the tangent line on the surface of the outer panel and the ground is 90 °. The thermal functional structure for automobile according to any one of claims 17 to 24, wherein the thermal functional structure is for a vehicle.   26. The boundary line closest to the ground is used as a reference line that defines a boundary between a part that imparts a heat insulation function and a part that imparts a heat dissipation function when there are a plurality of the boundary lines. The thermal functional structure for automobiles as described. The thermal functional structure for an automobile according to claim 17 or 18, wherein the heat radiating means is configured to be coated so that an emissivity in a far-infrared region of the coated surface is 0.7 or more. body. The paint applied by the coating having an emissivity of 0.7 or more in the far infrared region is at least one selected from the group consisting of zirconium oxide, alumina, zircon, titania, aluminum titanate, cordierite, and aluminum silicate. The thermal functional structure for automobiles according to claim 27 , comprising a high emissivity material . The thermal functional structure for an automobile according to claim 17 or 18, wherein the heat radiating means is configured by including a good heat conductive material in the indoor trim . 30. The thermal functional structure for an automobile according to claim 29, wherein the good heat conductive material is made of metal, carbon fiber, or a composite material containing them . The thermal functional structure for an automobile according to claim 29 or 30 , wherein the good heat conductive material has a sheet shape or a net shape . 32. The thermal functional structure for an automobile according to claim 31, wherein the good heat conductive material is included in an indoor trim using an insert molding method .