Sunroof device

Abstract

To provide a sunroof device which can restrain a decrease in temperature control efficiency within a cabin.SOLUTION: A sunroof device comprises a glass panel which is provided on an opening of a roof panel of a vehicle, and a sunshade which is provided in cabin inside of the glass panel so as to be openable and closable. Because a radiation cooling element is provided between the glass panel and the sunshade, it can restrain the temperature of the sunshade itself from rising and restrain the temperature control efficiency within a cabin from decreasing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sunroof device, and more particularly to a sunroof device capable of suppressing a rise in temperature inside a vehicle cabin. [Background technology]

[0002] A sunroof device provided on the roof of a vehicle is capable of admitting natural light through a glass panel, making the interior of the vehicle bright and open. However, the temperature inside the vehicle interior increases due to radiant heat from sunlight.

[0003] Patent Document 1 discloses that a sunshade equipped with a heat-shielding member made of aluminum material on the glass panel side not only blocks solar radiation, but also suppresses the temperature rise of the sunshade itself due to heat storage by reflecting the radiant heat of sunlight, thereby suppressing the decrease in the efficiency of temperature control inside the vehicle cabin. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5689440 Summary of the Invention [Problem to be solved by the invention]

[0005] However, even if the temperature rise of the sunshade due to radiant heat from sunlight can be suppressed, the temperature rise of the glass panel itself cannot be suppressed. Therefore, air convection between the glass panel and the sunshade causes the temperature of the glass panel to be transferred to the sunshade, causing the temperature of the sunshade to rise.

[0006] The present invention has been made in consideration of the problems associated with the conventional technology, and its object is to provide a sunroof device that can suppress the temperature rise of the sunshade itself and suppress the decrease in the efficiency of temperature control in the vehicle cabin. [Means for solving the problem]

[0007] As a result of extensive research into achieving the above-mentioned object, the inventors discovered that the above-mentioned object could be achieved by providing a radiative cooling material between the glass panel and the sunshade, and thus completed the present invention.

[0008] That is, the sunroof device of the present invention includes a glass panel provided at an opening in a roof panel of a vehicle, and a sunshade provided on the interior side of the glass panel in an openable and closable manner. The present invention is characterized in that a radiative cooling material is provided between the glass panel and the sunshade. Effect of the Invention

[0009] According to the present invention, by providing a radiative cooling material between the glass panel and the sunshade, a sunroof device can be provided that can suppress the temperature rise of the sunshade itself and suppress the decrease in the efficiency of temperature control in the vehicle cabin. [Brief description of the drawings]

[0010] [Figure 1] 1 is a cross-sectional view of a main portion of a sunroof device according to the present invention. [Diagram 2] 11A and 11B are diagrams illustrating a winding state of the sunshade winding device when the sunshade is turned over. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The sunroof device of the present invention will now be described in detail. As shown in FIG. 1, the sunroof device of the present invention comprises a glass panel provided at an opening in a roof panel of a vehicle, and a sunshade provided on the interior side of the glass panel in an openable and closable manner, and further comprises a radiative cooling material between the glass panel and the sunshade.

[0012] The sunshade has a light-blocking property and blocks the sunlight that passes through the glass panel, suppressing the rise in temperature inside the vehicle cabin due to the sunlight. However, in addition to being directly exposed to the sunlight, the sunshade is also heated by thermal radiation from the hot glass panel and air convection between the glass panel and the sunshade, causing the temperature to rise.

[0013] The sunroof device of the present invention is provided with a film-shaped radiative cooling material between the glass panel and the sunshade, thereby suppressing the temperature rise of the sunshade and preventing heat from being released from the sunshade into the vehicle cabin, thereby suppressing a decrease in the efficiency of temperature control inside the vehicle cabin.

[0014] The radiative cooling material is a material that radiates energy in the wavelength range of 8 to 13 μm, which is a wavelength band that is not absorbed by the atmosphere and is emitted into space, and is known as the "atmospheric window," and has high atmospheric transmittance. It is a material that becomes colder than the outside air when exposed to direct sunlight.

[0015] Examples of the radiative cooling material include SPACECOOL (manufactured by SPACECOOL Co., Ltd.) and films manufactured by Radi-Cool.

[0016] Furthermore, the glass panel of the present invention transmits energy in the 8 to 13 μm wavelength band radiated by the radiative cooling material, and unlike laminated glass, is formed of plate glass that does not contain resin materials.

[0017] By arranging the radiative cooling material between the glass panel and the sunshade so that the radiative cooling material covers the entire surface of the glass panel side of the sunshade, the energy in the wavelength band of 8 to 13 μm radiated by the radiative cooling material passes through the glass panel and is released outside the vehicle.

[0018] In addition, since heat transfer from the glass panel to the sunshade due to heat radiation from the glass panel and air convection can be blocked, a temperature rise in the sunshade can be suppressed.

[0019] The radiative cooling material is preferably arranged parallel to the glass panel. This allows the energy radiated from the radiative cooling material to be released outside the vehicle through the glass panel without being blocked by the roof panel, thereby suppressing the rise in temperature inside the vehicle cabin.

[0020] Moreover, the radiative cooling material is preferably white or silver in color. Because the radiative cooling material is white or silver in color, it reflects light in the wavelength range in which the solar spectrum is distributed (light in the visible light range), thereby suppressing the temperature rise of the radiative cooling material itself due to solar radiation.

[0021] The radiative cooling material is preferably integrated with the sunshade. The sunshade and the radiative cooling material are bonded together, and heat can be transferred between them. This allows heat inside the vehicle cabin to be transferred to the radiative cooling material via the sunshade, allowing the heat inside the vehicle cabin to be released outside the vehicle, lowering the temperature inside the vehicle cabin.

[0022] The shape of the sunshade may be a panel, but if it is a curtain, it can be turned over using a sunshade winding device described later, and the direction of radiation from the radiative cooling material can be changed depending on the temperature difference between the interior and exterior of the vehicle.

[0023] In other words, in the summer when the temperature inside the vehicle is higher than the temperature outside the vehicle, by placing the radiative cooling material on the glass panel side, the heat inside the vehicle can be released to the outside.

[0024] Conversely, in winter, when the temperature inside the vehicle cabin is lower than the temperature outside, the sunshade can be inverted so that the radiative cooling material is facing the vehicle cabin. This allows the sunshade to block out sunlight while radiating heat from the sun into the vehicle cabin via the radiative cooling material, thereby maintaining a comfortable interior.

[0025] The sunshade winding device that turns the sunshade over has two winding shafts arranged in parallel, as shown in FIG.

[0026] When the sunshade is turned over, first, the entire sunshade is wound up on the winding shaft on the opening side, and then the rear end of the wound sunshade is wound up on the winding shaft opposite the opening.

[0027] The sunshade can be turned over by not winding it up around the winding shaft on the opening side, but by unwinding it from the winding shaft on the opposite side to the opening.

[0028] Such a sunshade winding device is provided between the roof panel and the roof trim, in front of or behind the opening of the roof panel.

[0029] The sunroof device of the present invention may further include temperature sensors between the glass panel and the sunshade and within the vehicle compartment.

[0030] This allows the direction of radiation from the radiative cooling material to automatically change depending on the temperature difference between the interior and exterior of the vehicle, maintaining a comfortable interior.

[0031] The sunshade is preferably made of a woven fabric. Since the sunshade is made of woven fabric, wrinkles are unlikely to occur even if the sunshade is repeatedly wound up and taken out by the sunshade winding device, and deterioration of the design can be suppressed. [Explanation of symbols]

[0032] 1 Glass Panel 2. Radiative cooling materials 3. Sunshade 4 Sunshade winding device 5 Roof Panel 51 Opening 6 Roof trim

Claims

1. a glass panel provided in an opening of a roof panel of a vehicle; a sunshade provided on the interior side of the glass panel in an openable and closable manner, A sunroof device comprising a radiative cooling material between the glass panel and the sunshade.

2. 2. The sunroof device according to claim 1, wherein the radiative cooling material is disposed parallel to the glass panel.

3. The sunroof device according to claim 1, characterized in that the radiative cooling material is white or silver in color.

4. The sunroof device according to claim 1, characterized in that the sunshade and the radiative cooling material are integrated together.

5. Further, a sunshade winding device is provided, 5. The sunroof device according to claim 4, wherein the sunshade winding device is capable of reversing the sunshade upside down.

6. Furthermore, a temperature sensor is provided between the glass panel and the sunshade and in the vehicle interior, When the temperature inside the vehicle is higher than the temperature between the glass panel and the sunshade, The sunroof device according to claim 5, wherein the sunshade winding device turns the sunshade over so that the radiative cooling material faces the vehicle interior.

7. 7. The sunroof device according to claim 6, wherein the sunshade has a light blocking property.

8. 8. The sunroof apparatus according to claim 7, wherein the sunshade is made of a woven fabric.

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