JP4325348B2 - 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 in particular, it is possible to promote the release of indoor heat for the purpose of reducing the indoor atmosphere temperature and interior component temperature during parking in hot weather. It relates to a vehicle body heat insulation heat dissipation system.

  It is well known that the interior of a parked automobile becomes very hot under hot weather. According to the measurement of the indoor temperature in Japan in summer, the indoor temperature when parked under the sun reaches about 70 ° C. In the interior materials, the upper surface of the instrument panel is around 100 ° C, the surface of the ceiling material and the surface of the seat are 70 ° C. It has been reported to reach temperatures as high as around ℃. Needless to say, there is no uncomfortable feeling when riding in such a situation, and radiant heat is generated from the interior material for a long time, and heat is stored on the seat surface, so that the passenger gets uncomfortable by receiving hot air from the seat by heat conduction At the same time, since the room temperature and the interior material temperature are not easily lowered in ventilation or cooling, excessive energy consumption due to cooling is also a problem.

  Conventionally, with respect to the problem of parking under such hot weather, for example, in order to prevent an increase in the indoor temperature, a heat insulating material described in Patent Document 1, for example, is installed between the outer plate and the inner plate of the ceiling or door to prevent heat from entering. Deterrence techniques have been proposed.

  However, with this technology, although the heat penetration rate through the ceiling and doors decreases and there is a slight delay in temperature rise, the amount of heat that penetrates through sunlight through the windows is large, and the equilibrium temperature that is finally reached is not significantly different. .

  For the purpose of improving the heat insulation of the vehicle body and at the same time suppressing radiation from the vehicle body and windows that become hot, the door interior and the window interior made of double glass, for example, described in Patent Document 2, are communicated. A technique for exhausting indoor air sucked from the lower part from the upper part of the window or the roof has been proposed.

  However, this technique lacks the viewpoint of maintaining equilibrium when the room temperature rises under the hot sun and the heat in the passenger compartment is radiated through windows and doors. In particular, since the window on the shaded side of the vehicle is the main route of heat dissipation, the double glass of this method has a concern that the indoor temperature balance is shifted to the high temperature side and the indoor environment is deteriorated.

In addition, as in Patent Document 3, for example, many methods for performing ventilation using a solar cell or the like have been proposed. However, these proposals do not greatly contribute to the purpose of reducing the thermal balance of the entire vehicle, only exchanging a small part of the air in the vehicle interior with the outside air.
Special table 2001-500818 JP-A-5-338428 JP-A-9-295509

  In the present invention, due to such a conventional problem, that is, lack of the viewpoint of heat balance of the vehicle, even if it seems that the heat intrusion is partially suppressed, the amount of heat retained in the entire room does not change or rather increases. The purpose of this invention is to provide a thermal functional structure for automobiles that can substantially lower the indoor temperature during parking in hot weather and reduce the air conditioning load for discomfort and cool-down immediately after riding. With the goal.

In order to achieve the above object, according to the present invention, a vehicle body for defining a compartment is divided into a vehicle body upper part and a vehicle body lower part with a substantially horizontal boundary line as a boundary, and the vehicle body upper part has a first heat dissipation. On the other hand, on the floor under the vehicle body , there is provided means having a second heat radiation function different from the means having the first heat radiation function, and the means having the first heat radiation function is provided. The ventilation means is configured to ventilate indoor air, and the ventilation means includes a ventilation hole provided in the upper part of the vehicle body and an intake hole provided in a floor of the lower part of the vehicle body. In the upper part of the vehicle body, heat is dissipated by means of a heat dissipation function based on the principle of convection heat transfer, and in the lower part of the vehicle body by means of the second heat dissipation function, heat is conducted or radiated to the lower part by conducting or radiating. It is a heat functional structure for a motor vehicle for radiating.

According to the present invention, the means having the first heat dissipation function dissipates heat in the upper part of the vehicle according to the principle of convection heat transfer, and the means having the second heat dissipation function causes heat to be conducted or radiated in the lower part of the vehicle body. By radiating heat to the surrounding environment while guiding to the lower part, it is possible to suitably lower the air temperature of the entire vehicle interior. Therefore, the temperature balance in the passenger compartment left under the hot sun can be greatly shifted to the low temperature side, the temperature environment can be improved, and the air conditioning load for cooling down can be reduced.

  Based on the idea of “raising the heat dissipation capacity and shifting the indoor thermal balance to the low temperature side” based on the knowledge that has been engaged in research on the thermal equilibrium of the vehicle body and the room for many years, the present inventors It has been found that the indoor temperature environment can be made comfortable by dividing the upper and lower parts into two from the viewpoint and providing each part with a heat dissipation mechanism suitable for its thermal function. Furthermore, based on the knowledge that has been involved in the research on the heat flow in the vehicle body and the room, the present invention is completed by repeatedly devising the heat so that it can be quickly moved to the heat dissipation mechanism without stagnation in the room. It came.

  The operation of the present invention will be described.

FIG. 1 is a diagram for explaining a thermal functional structure for an automobile according to the present invention, and is a longitudinal sectional view of a vehicle body 50 as viewed from the front. Moreover, FIG. 2 is a schematic block diagram which shows the heat insulation vehicle to which the thermal functional structure for motor vehicles of a reference example is applied.

  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. A means 61 having a first heat dissipation function is provided at 52, while a means 62 having a second heat dissipation function different from the means 61 having a first heat dissipation function is provided at the vehicle body lower part 53.

  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.

  Here, the concept of dividing the vehicle body from the thermal function will be described.

  Regarding the temperature rise of the indoor space when left under the sun, the outer panel such as the roof 34 surrounding the indoor space is heated by solar radiation, etc., and the temperature of the indoor air rises due to heat conduction, radiation, convection heat transfer, etc. It becomes. The inventors paid attention to the temperature behavior of the outer panel 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 was found that the part where the outer panel acts as the heat input part in this time zone is the part that is exposed to direct sunlight, and the other lower part of the vehicle body has a low temperature and does not act as the heat input part. . That is, from the meaning of the heat input function by solar radiation, the vehicle body 50 is divided into two parts, a vehicle body upper part 52 and a vehicle body lower part 53 that receive solar radiation around the south and middle hours. Specifically, as shown in FIG. 1, the vehicle body upper part 52 and the vehicle body lower part 53 are set at a substantially central position 58 a in a vertical line 58 connecting the door panel upper end 54 and the side sill lower end 55 with a perpendicular line 57 from the ground surface 56. The vehicle body 50 can be divided into two.

  Further, another factor in the rise in indoor temperature is a path through which light energy transmitted through the window glass such as the windshield, the side glass 36, and the rear glass is absorbed by the interior material and released into the room as heat energy. Examples of the target part as this phenomenon include the interior trim 33 such as a door trim and a head lining, a cushion of the seat 40, and the like in addition to the instrument panel surface and the rear parcel shelf. Above these parts, the indoor air is warmed mainly by convective heat transfer, and the heat is diffused by the updraft. On the other hand, heat is transmitted below these parts by heat conduction or radiation. Therefore, when the indoor part is viewed from the thermal function, the seat seat surface 40a, which is a part that has a great influence on the increase in the indoor temperature because it is located at the bottom and has the largest area among them, is used as a boundary. The room can be divided into an upper part and a lower part. However, the position of the seat seat surface 40a varies depending on the shape and form of the vehicle. As shown in FIGS. 7A to 7E, automobiles can be classified into sedans, compact cars, minivans, wagons, coupes, etc. according to their vehicle shapes. Besides these, mini cars, SUVs, 1BOX, 2 BOX, van, truck, etc., but in each vehicle type, the seat seating surface 40a is located at 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. The length 58 is located at a position 58b of 20 to 60% in the length ratio upward from the lower end of the side sill 55 with respect to the entire length of the vertical line 58.

  Therefore, in consideration of the boundary seen from the heat input function mentioned above and the boundary seen from the heat conduction function in the room, the vertical line 58 connecting the door panel upper end 54 and the side sill lower end 55 with the perpendicular 57 from the ground surface 56. The vehicle body 50 is divided into two parts, the upper part and the lower part, with the position 58b of the length ratio 20b to 60% in the upward direction from the side sill lower end 55 with respect to the entire length of the vertical line 58 as a boundary line 51. The present inventors have found that it is possible to design a heat flow in consideration of the thermal function.

  As described above, the vehicle body 50 is divided into the vehicle body upper part 52 and the vehicle body lower part 53 on the basis of the boundary line 51, and the optimum heat dissipation mechanism for each of them, particularly the convection heat transfer (updraft) in the vehicle body upper part 52. The ventilation, which is a mechanism that promotes heat dissipation in the operating principle, has a mechanism for radiating heat to the relatively low temperature air and the surrounding environment while guiding the heat of the upper body 52 to the lower part by conduction or radiation suitably. . As a result, in the conventional vehicle, heat that stays in the room and becomes a large heat source and pushes up the equilibrium temperature is circulated between the upper part and the lower part in the present invention, and is radiated from each part in a suitable form. As a result, the temperature balance in the passenger compartment left under the hot sun was greatly shifted to the low temperature side, and the temperature environment was improved.

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

( Reference example )
FIG. 2 is a schematic configuration diagram showing an insulated vehicle to which a thermal functional structure for an automobile of a reference example is applied.

The thermal functional structure for an automobile of the reference example is roughly divided into a vehicle body 50 for partitioning the 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. The vehicle body upper part 52 is provided with means 61 having a first heat dissipation function, while the vehicle body lower part 53 is provided with means 62 having a second heat dissipation function different from the means 61 having the first heat dissipation function ( (See FIG. 1). 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 is divided into a part with a large temperature rise due to standing in the sun and a part with a small temperature as described above. . 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.

  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 greatly different in temperature distribution and heat flow, are preferably divided into two parts so that the heat dissipation 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 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 first heat radiation function provided in the vehicle body upper part 52 is constituted by a ventilation means for ventilating the indoor air. Specifically, a ventilation device 11 as a ventilation means is provided at the rear end of the roof 34. The ventilation device 11 has ventilation holes (not shown) provided in the roof and / or the pillar.

The ventilator 11 discharges hot air rising from the upper surface of the instrument panel, the seat seat surface 40a, or the upper surface of the rear parcel shelf together with the indoor air exhausted out of the passenger compartment due to the rising airflow. It is an essential condition for the ventilator 11 that the room and the outside of the vehicle are connected as an air flow path . In addition, it can be said that it is practically effective to provide eaves, a louver, or a door that can be opened and closed in order to prevent the inflow of rainwater from outside the vehicle and the inflow of unnecessary outside air when the ventilation function is not required. In the reference example , the installation position of the ventilation device 11 is the rear end of the roof. However, the present invention is not limited to this. Is obtained.

  The means 62 having the second heat radiation function provided in the lower part 53 of the vehicle body is preferably formed from a high thermal conductivity material and / or a high radiation material.

More specifically, the interior member of the lower part 53 of the vehicle body has a function of absorbing heat radiated from the interior and window glass that has become hot and transmitting the heat to a non-heat input part (heat radiation part) of the outer panel. Necessary. A normal carpet functions as a heat insulating material because it is a fiber body made of polyester or polypropylene, but the carpet 12 having a heat radiation promoting function used here absorbs heat from the upper part 52 of the vehicle body and efficiently transmits it to the floor. . As such a carpet, a fibrous body containing a far-infrared radioactive filler is preferably used. As far-infrared radioactive filler, various kinds such as TiO ₂ , Al ₂ O ₂ , Al ₂ O ₃ , MgO, SiO ₂ , 2MgO · 2Al ₂ O ₃ · 5SiO _2, etc. known as carbon black, carbon fiber or far-infrared radiation ceramics It is a metal oxide, and these can be appropriately mixed and dispersed in a resin to form a fiber, such as a nonwoven fabric. In addition to heat transfer by radiation, it is also possible to further increase the thermal conductivity in the thickness direction by mixing fiber bodies having high thermal conductivity. The carpet thus obtained efficiently transfers the heat absorbed by the surface layer to the floor and promotes heat dissipation.

In the reference example , the form in which the means 62 having the second heat radiation function is provided on the floor, that is, the form in which the carpet 12 is used as the interior for promoting the heat radiation function of the lower body 53 is shown. For example, a similar material can be applied to, for example, a door trim lower part (corresponding to a door) or a dash insulator installed in the lower part 53 of the vehicle body to improve heat dissipation performance.

The outer plate member of the vehicle body lower portion 53 needs to have a function of receiving heat from the interior having excellent heat conduction and radiating heat. The vehicle body lower portion 53 outer plate portion that should have this function includes a door lower portion, a floor, a side sill, or front and rear fender lower portions. Among them, it is preferable from the object of the present invention to promote heat dissipation of a floor panel having a large area without being always exposed to sunlight. Therefore, in the reference example , the means 62 having the second heat radiation function is provided on the floor, and is further formed from a fibrous body and / or a coating material containing a far infrared radiation material.

Specifically, the coating material 13 for promoting heat dissipation was applied to the outside of the floor. Since the outside of the floor is usually coated with a thick film of several hundred μm called an undercoat for the purpose of rust prevention or sound insulation, the heat dissipation performance is not high. In the reference example , a filler excellent in thermal conductivity and far-infrared radiation ability was added to the resin composition of the undercoat to effectively dissipate the heat of the floor under the floor. Fillers with excellent far-infrared radiation ability are various metal oxides such as TiO2, Al2O2, Al2O3, MgO, SiO2, 2MgO.2Al2O3,5SiO2 mentioned above, especially in addition to far-infrared radiation characteristics. Considering the thermal conductivity and the point that it can be obtained industrially at low cost, alumina (Al2O3) can be said to be an easy-to-use material. In order to further increase the heat dissipation efficiency, adjusting the particle size of the filler and increasing the roughness of the coating film surface can also be used as an effective means.

As described above, in the reference example , the heat of the indoor member heated directly or by heat input from the outer plate of the upper part 52 of the vehicle body is dissipated by the ventilation of the updraft in the upper part 52 of the vehicle body, and the floor is radiated and thermally conducted in the lower part 53 of the vehicle body. By further dissipating the heat transferred to the floor under radiation and conduction, the thermal balance of the vehicle body can be effectively shifted to the low temperature side.

  In general vehicles, roofs, windowpanes, indoor trims, seats, and the like absorb solar radiation and rise in temperature, and then release their thermal energy into the room by radiation. 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 of the reference example , the temperature of members such as the roof 34, the indoor trim 33, the seat 40, and the like, which have a particularly large influence on the occupant, is reduced, and thus the radiation of thermal energy to the occupant Becomes smaller. As a result, it is possible to reduce discomfort during boarding.

(Embodiment 1 )
FIG. 3 is a schematic configuration diagram illustrating an insulated vehicle to which the thermal functional structure for automobiles according to Embodiment 1 of the present invention is applied.

In the thermal functional structure for an automobile according to the first embodiment, the ventilation means further has an intake hole provided in the lower part 53 of the vehicle body in order to improve the performance of the reference example . Specifically, the intake holes 14 are provided on the floor.

  Ordinary vehicles do not have additional ventilation holes for ventilation, and are naturally ventilated through draft pipes provided in the vicinity of the wiring piping holes and rear pillars of the vehicle body.

On the other hand, in the first embodiment, by providing the intake holes 14 on the floor, air convection in the passenger compartment becomes smoother, and the movement of heat to the ventilation mechanism by the rising airflow is further promoted. In the present invention, the lower body 53 essentially absorbs the heat of the upper body 52 and has a temperature difference from the air temperature at the lower part of the floor. Facilitate. In addition, when intake occurs, a flow of air below the floor occurs, and a synergistic effect is generated in which heat dissipation from the floor is promoted.

As described above, in the first embodiment, the ventilation heat release of the vehicle body upper part 52 and the heat release of the floor are synergistically promoted by the floor intake holes 14.

(Embodiment 2 )
FIG. 4 is a schematic configuration diagram showing an insulated vehicle to which a thermal functional structure for automobiles according to Embodiment 2 of the present invention is applied.

In the automotive thermal functional structure according to the second embodiment, the rear surface of the interior member of the vehicle body upper part 52 that receives direct radiation is provided on the vehicle body lower part 53 with a second heat dissipation function 62 through a good heat conductive material. Is thermally coupled to the

More specifically, an instrument panel and a rear parcel shelf that are exposed to direct radiation and have the highest temperature in the room are provided with a mechanism that conducts heat to the lower part 53 of the vehicle body and dissipates the heat. A good heat conductive material 15 is provided on the back surface of the instrument panel top plate, and the good heat conductive material 15 is joined to a dash panel 16 connected to the vehicle body lower portion 53. Usually, the instrument panel is made of resin, and the heat absorbed by the instrument panel is accumulated in a component member such as a space inside the instrument panel or an air conditioner, and becomes a very large heat pool. This heat eventually becomes a heat source for supplying heat into the room, and also causes discomfort that hot air blows out from the air conditioner immediately after the start of boarding. In the second embodiment, the heat is transferred to the relatively low-temperature floor panel via 15 and 16 and is dissipated therefrom.

  Also, the heat conducting material 17 provided in the rear parcel shelf performs the same function, and transmits a large amount of heat stored in the rear side of the rear parcel shelf to the partition wall 18 separating the passenger compartment from the trunk, and further to the floor. Heat is dissipated.

  As the good heat conductive material here, a metal such as a steel plate, aluminum, and magnesium, or a carbon fiber-containing high heat conductive composite material can be used in the form of a plate, rod, or net. In order to obtain higher performance heat conduction, a heat conduction device such as a rod-like, plate-like or loop-type heat pipe can be used as a good heat conduction material.

In the second embodiment, the installation position of the heat conduction promoting means from the vehicle body upper part 52 to the vehicle body lower part 53 is the instrument panel and the rear parcel shelf. However, the present invention is not limited to this. It is effective to guide the heat of the interior material corresponding to the upper part 52 of the vehicle body, such as the upper part of the door trim or the seat seat surface 40a, which is heated by direct irradiation to the lower part 53 of the vehicle body and connect it to the heat dissipation mechanism.

(Embodiment 3 )
FIG. 5 is a schematic configuration diagram showing an insulated vehicle to which a thermal functional structure for automobiles according to Embodiment 3 of the present invention is applied.

In the thermal functional structure for an automobile according to the third embodiment, the rear surface of the interior member of the vehicle body upper part 52 that receives direct radiation has a first heat radiation function means 61 provided on the vehicle body upper part 52 through a good heat conductive material. Is thermally coupled to the

More specifically, each of the instrument panel and the back surface of the parcel is connected to the heat pipes 19 and 20 via the good heat conductive materials 15 and 17 similar to those of the second embodiment. Each of the heat pipes 19 and 20 passes through the pillars and is connected to heat sinks 21a and 22a of the ventilation devices 21 and 22 installed on the roof 34. That is, the heat radiating portions of the heat pipes 19 and 20 are connected to the heat sinks 21a and 22a in the air passage through which room air flows for ventilation. Since the surface temperature of the instrument panel or the like is about 20 to 30 ° C. higher than the air temperature in the upper part of the room, in the third embodiment, the heat on the back surface of the instrument panel is efficiently radiated through the heat pipes 19 and 20. be able to. In particular, when viewed from the principle of the heat pipe, this form takes a bottom heat layout in which the heat radiating portion is located above the heat absorbing portion, and the heat transport capability of the heat pipes 19 and 20 functions extremely efficiently. Further, the third embodiment has a synergistic effect that a rising airflow is generated when the ventilation hole itself becomes a high temperature, and the ventilation efficiency in natural ventilation is improved .

  Although all the above embodiments have been described by taking a sedan type vehicle as an example, for the purpose of the present invention, a compact car, a minivan, a wagon, a coupe, etc., as shown in FIGS. In addition to being suitable for the vehicle type, of course, sufficient effects are exhibited for vehicles such as light vehicles, SUVs, 1BOX, 2BOX, vans, and trucks.

  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. Means 61 having a first heat dissipation function is provided in the upper part 52, while means 62 having a second heat dissipation function different from the means 61 having the first heat dissipation function is provided in the lower part 53 of the vehicle body. In the upper part 52 of the vehicle body, heat is radiated on the principle of operation by means 61 having the heat radiation function, and heat is conducted to the lower part by conduction or radiation in the lower part 53 of the vehicle body by means 62 having the second heat radiation function. By radiating heat to the surrounding environment, the air temperature in the entire room can be suitably lowered.

EXAMPLES Hereinafter, although an Example , a reference example, and a comparative example are demonstrated further in detail with drawing, this invention is not limited to these Examples. Although the sedan type shown in FIG. 7A is used as the base vehicle of the example , reference example, and comparative example, the vehicle type is not limited thereby.

( Examples and reference examples )
The ventilation mechanism of the roof part is a cylindrical shape of 30 mm in height with vents of 50 mm in length and 100 mm in width at the four joints between the upper part of the left and right A pillars and C pillars and the roof, and a shutter that can be opened and closed. The room communicated with the outside air by a guide. A heat sink in which 50 mm × 30 mm aluminum plates were arranged in parallel at a pitch of 5 mm was provided inside the cylindrical guide. In addition, a DC fan with a rated input of 13.2 W, manufactured by Sanyo Denki Co., Ltd., product name: San Ace 60 mm was attached to the vehicle interior side to provide a structure capable of forced exhaust. In the reference example, the fan is in an operating state.

The carpet is made of alumina (Al ₂ O ₃ , 0.6 μm in diameter) as a far-infrared radioactive filler, polyethylene terephthalate (PET) as a thermoplastic resin, 40 μm in diameter, and 50 μm in diameter. The titanium fiber was kneaded at a mixing ratio of 2: 1 using a titanium fiber of 25%, and a non-woven fabric was prepared using 25 parts by weight of binder fiber with respect to 100 parts by weight of the kneaded fiber. This was used as a cushioning material of 1000 g / m ² .

  The adjustment of the undercoat is made by Yuka Shell Epoxy Co., Ltd., trade name: 100 parts by weight of Epicoat 828, 8 parts by weight of dicyandiamide, 120 parts by weight of tributyl phosphate made by Daihachi Chemical Industry Co., Ltd., n-butyl glycidyl ether 50 parts by weight (viscosity 110 cps / 25 ° C.), alumina powder made by CONDEA CHEMIE as thermal conductive ceramics, product name: DISPERAL (average particle size 25-45 μm), particles of 45 μm or more were removed with a 330 mesh sieve 400 parts by weight of the product was charged into a mixing container and dispersed and mixed using a homogenizer so that each component was uniform. Thereafter, the viscosity was adjusted by adding 50 parts by weight of xylene as a diluent solvent.

Undercoat coating is applied to the floor of the white body that has been press-molded with the above-prepared coating material in a 30: 1 airless pump, the coating temperature is adjusted to 45 ° C, and coating is performed at an air pressure of 5.0 kg / cm ² . The film was applied so that the film thickness was 100 μm ± 50 μm. After coating, it was left at room temperature for 15 minutes, and after applying the electrodeposition paint in the coating process, it was cured at 170 ° C. for 30 minutes to obtain a cured coating film.

  The floor air intake holes were formed in the floor below the left and right front seats with a hole of 50 mm length x 50 mm width, and the room and outside air were communicated by a cylindrical guide with a height of 60 mm provided with an openable shutter.

  The good heat conduction material on the back of the instrument panel top plate is an aluminum panel with a thickness of 1 mm formed into an almost instrument panel top plate shape, and the surface is made of black TPO (thermoplastic olefin) material, which is the same material as the actual vehicle product. Was pasted with an adhesive and installed on the part where the actual vehicle instrument panel top plate was excised. The front end of the aluminum panel was screwed to the dash panel, and a thermal conductive adhesive (manufactured by Techno Alpha Co., Ltd., trade name: Dimat DM4030LD) was filled in the gap between the panels.

  As with the instrument panel, the 1mm-thick aluminum panel is cut into a roughly rear parcel shape, and the surface of the polyester non-woven fabric material, which is the same material as the actual vehicle product, is glued to the surface. Attached and installed in the part where the rear parcel of the actual vehicle was removed. The front end of the aluminum panel was bent downward and screwed to a partition wall separating the passenger compartment and the trunk, and a thermal conductive adhesive (trade name: Diamat DM4030LD, manufactured by Techno Alpha Co., Ltd.) was filled in the gap between the panels.

  The heat pipe connecting the instrument panel and the rear parcel to the ventilation hole of the ceiling inserted a copper wire bundle as a wick into a copper pipe having an outer diameter of 8 mm and an inner diameter of 6 mm, injected a suitable amount of distilled water, and sealed in a vacuum. The length was appropriately adjusted in the range of 1000 mm to 2000 mm according to the part shape.

  The heat pipe is installed on the back side of the above-mentioned molded aluminum panel by crushing one end of the heat pipe and soldering it as a flat mold, and installing the other end in the joint with the roof through the front and rear pillars. It was lifted up to the vent hole, connected to a heat sink installed in the vent hole, and fixed by soldering.

Example 1
As a heat dissipation measure for the vehicle body upper part 52, four ventilation holes were opened and the fan was stopped. In addition, the air intake hole in the lower part 53 of the vehicle body was opened. As a heat dissipation measure for the lower part 53 of the vehicle body, a heat dissipation promoting carpet and an undercoat were used.

( Reference Example 1 )
As a heat dissipation measure for the vehicle body upper part 52, four ventilation holes were opened, and the fan was in an operating state. In addition, the air intake hole in the lower part 53 of the vehicle body was opened. As a heat dissipation measure for the lower part 53 of the vehicle body, a heat dissipation promoting carpet and an undercoat were used.

( Reference Example 2 )
As a heat dissipation measure for the vehicle body upper part 52, four ventilation holes were opened, and the fan was in an operating state. In addition, the air intake hole in the lower part 53 of the vehicle body was opened. As a heat dissipation measure for the lower part 53 of the vehicle body, a heat dissipation promoting carpet and an undercoat were used. The instrument panel and the rear parcel were made of aluminum with a good heat conduction specification, and were joined to the dash panel and the trunk partition wall to dissipate heat at the lower part 53 of the vehicle body.

( Reference Example 3 )
As a heat dissipation measure for the vehicle body upper part 52, four ventilation holes were opened, and the fan was in an operating state. In addition, the air intake hole in the lower part 53 of the vehicle body was opened. As a heat dissipation policy for the lower part 53 of the vehicle body, a heat dissipation promoting carpet and an undercoat were used. The instrument panel and the rear parcel were made of aluminum with a good heat conduction specification, joined to the ventilation hole using a heat pipe, and heat was exchanged and dissipated at the upper part 52 of the vehicle body.

(Comparative Example 1)
The current sedan type vehicle was used.

(Comparative Example 2)
Using the current sedan type vehicle, on the back surface of the ceiling material, on the back surface of the four door trims, on the back surface of the three pairs of left and right pillars, on the fiber heat insulating material manufactured by Sumitomo 3M Limited, product name: Thinsulate, product number TAI-3029 (weight per unit: 300 g / m ² ) was cut into an internal part shape and inserted, and the heat insulation specification was adopted.

(Evaluation of vehicle assuming under hot weather)
FIG. 6 is a schematic diagram showing an apparatus for evaluating the heat dissipation performance of Examples , Reference Examples, and Comparative Examples.

  As shown in FIG. 6, the vehicle to be evaluated is installed in an environmental test room having an infrared lamp 23 and a blower / air conditioner, the environment is set under the following conditions, soaked for 60 minutes, and then thermocoupled. The air temperature in the vicinity of the driver's head 24, the surface temperature on the instrument panel upper surface 25, the air temperature in the vicinity of the driver's feet 26, and the surface temperature on the outside of the vehicle on the floor panel 27 under the driver were measured.

Environmental conditions are
Solar radiation intensity: 767 W / m ²
Temperature: 35 ° C
Humidity: 70% RH
Wind speed: 0.8 m / sec
It was.

(Evaluation results)
The evaluation results are shown in FIG.

  In Example 1, compared with the temperature environment of the current vehicle of Comparative Example 1, a drop of about 5 ° C. is observed in the head air temperature. In addition, the underfloor temperature is slightly higher than that of the comparative example, and it can be seen that the heat radiation from the lower part 53 of the vehicle body contributes.

In Reference Example 1 , the head temperature is further lowered by about 4 ° C. compared to Example 1, and the effect of fan operation is obtained.

In Reference Example 2 , since the heat of the instrument panel and the rear parcel was conducted to the lower part 53 of the vehicle body and radiated, the surface temperature of the instrument panel was lowered by about 14 ° C. compared with Comparative Example 1, resulting in synergy with the ventilation effect. The head air temperature was about 11 ° C. lower than that of Comparative Example 1. Further, the underfloor temperature is further increased by 3 ° C. compared to the first embodiment, and it can be seen that the heat radiation from the lower part 53 of the vehicle body contributes.

In Reference Example 3 , the heat of the instrument panel and rear parcel was dissipated through the ventilation hole, so that an effect of lowering the head air temperature by about 4 ° C was obtained compared to Reference Example 2, and heat conduction and heat dissipation by ventilation and heat pipes were obtained. The synergistic effect was demonstrated.

  On the other hand, the heat insulation vehicle body of Comparative Example 2 manufactured by simulating the conventional example shows that in this evaluation for measuring the thermal equilibrium state, both the air temperature and the component surface temperature rise compared to the current vehicle of Comparative Example 1. became.

  As shown in the above evaluation results, the vehicle body is divided into a vehicle body upper part 52 and a vehicle lower part, and an optimum heat dissipation mechanism for each of them, in particular, in the vehicle body upper part 52, convective heat transfer (updraft) is used as an operating principle. In the ventilation and vehicle body lower portion 53 that is a mechanism that promotes heat dissipation, a mechanism that dissipates heat to the lower temperature air and the surrounding environment while providing heat to the lower portion of the vehicle body 52 preferably by conduction or radiation is provided. It was confirmed that the temperature environment could be improved by greatly shifting the temperature equilibrium of the passenger compartment left in the vehicle to the low temperature side.

  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 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. It is a schematic block diagram which shows the heat insulation vehicle to which the thermal function structure for motor vehicles of a reference example is applied. It is a schematic block diagram which shows the heat insulation vehicle to which the thermal functional structure for motor vehicles concerning Embodiment 1 of this invention is applied. It is a schematic block diagram which shows the heat insulation vehicle to which the thermal function structure for motor vehicles concerning Embodiment 2 of this invention is applied. It is a schematic block diagram which shows the heat insulation vehicle to which the thermal functional structure for motor vehicles concerning Embodiment 3 of this invention is applied. It is the schematic which shows the apparatus which evaluates the thermal radiation performance of an Example , a reference example, and a comparative example. It is a figure which shows the base vehicle of an Example , a reference example, and a comparative example. It is a graph which shows the temperature measurement result of an Example , a reference example, and a comparative example.

Explanation of symbols

11 Ventilation device (ventilation means),
12 Carpet,
13 Coating material,
14 air intake holes,
15 Good thermal conductivity material,
16 Dash panel,
17 Good heat conduction material,
18 Bulkhead,
19, 20 heat pipe,
21, 22 Ventilation device (ventilation means),
40 seats,
40 seat surface,
50 body,
51 border,
52 Upper body,
53 Lower body,
54 Upper edge of door panel,
55 Lower side sill,
56 Ground surface,
57 perpendicular,
58 vertical line,
58a substantially central position in the vertical line,
58b A 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 a first heat dissipation function;
62 means having a second heat dissipation function;
R Car cabin.

Claims (13)

The vehicle body for defining the compartment is divided into two parts, the upper part of the vehicle body and the lower part of the vehicle body, with a substantially horizontal boundary as a boundary, and the upper part of the vehicle body is provided with means having a first heat radiation function. The floor is provided with means having a second heat radiation function different from the means having the first heat radiation function,
The means having the first heat dissipation function is composed of ventilation means for ventilating room air,
The ventilation means has a ventilation hole provided in the upper part of the vehicle body and an intake hole provided in the floor under the vehicle body,
The means having the first heat dissipation function dissipates heat in the upper part of the vehicle according to the principle of convection heat transfer, and the means having the second heat dissipation function lowers the heat by conduction or radiation to the lower part of the vehicle body. Thermal functional structure for automobiles that dissipates heat to the surrounding environment while guiding.   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. The thermal functional structure for an automobile according to claim 1, wherein the ventilation hole is provided in a roof and / or a pillar . 2. The thermal functional structure for an automobile according to claim 1 , wherein the means having the second heat radiation function is formed of a high thermal conductivity material and / or a high radiation material . 2. The thermal functional structure for an automobile according to claim 1 , wherein the means having the second heat radiation function is formed of a fiber body including a far infrared radiation material and / or a coating material . 9. The thermal functional structure for an automobile according to claim 1, wherein the means having the second heat radiation function is further provided on a door under the vehicle body. The rear surface of the vehicle body upper portion of an interior member which receives the direct, via the good thermal conductive material, any of claims 1 to 9, characterized in that it is thermally coupled to the means having a second heat radiation function The thermal functional structure for motor vehicles as described in any one . The rear surface of the vehicle body upper portion of an interior member which receives the direct, via the good thermal conductive material, any of claims 1 to 10, characterized in that it is thermally coupled to the means having the first heat radiation function The thermal functional structure for motor vehicles as described in any one . The thermal functional structure for an automobile according to claim 10 or 11 , wherein the good heat conductive material is constituted by a heat pipe . The thermal functional structure for an automobile according to claim 12 , wherein the heat radiating portion of the heat pipe is connected to a heat sink in an air passage through which room air flows for ventilation .