Vehicular sunshade device

Abstract

To provide a vehicular sunshade device that can reduce energy loss due to air-conditioning work to elongate a distance to empty of a vehicle.SOLUTION: A vehicular sunshade device 100 comprises an opening / closable window glass 4 and a shade part 10. The shade part 10 is configured so that a first shade 11 and a second shade 21 are sequentially laminated through a predetermined gap TG from a window frame 3 side. The first shade 11 has a first base material 12 having a predetermined thickness T1 and a plurality of first ventilation holes 15 penetrating through the first base material 12. The second shade 21 has a second base material 22 having a predetermined thickness T2 and a plurality of second ventilation holes 25 penetrating through the second base material 22. In a planar view, the plurality of first ventilation holes 15 are arranged so as to be blocked with the second base material 22, and the plurality of second ventilation holes 25 are arranged so as to be blocked with the first base material 12.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a sunshade device for a vehicle, and more particularly to a sunshade device for a vehicle that is provided in a vehicle having an openable and closable window glass. [Background technology]

[0002] In recent years, electric vehicles using electric motors instead of internal combustion engines as their drive source have been developed. One of the challenges in the development of electric vehicles in recent years is extending their driving range. One possible solution to this problem is to equip the vehicle with large-capacity storage batteries so that it can store a large amount of consumable energy. However, installing a large number of storage batteries increases the vehicle weight and manufacturing costs, which are problems.

[0003] In response to this, the inventors have carried out development from the perspective of reducing energy loss in vehicles, focusing in particular on energy loss due to air conditioning work among various types of energy loss. That is, in order to reduce air conditioning work, when lowering the temperature inside the vehicle cabin, it is desirable to suppress the operation of the air conditioning device by ventilating between the outside air and the inside air and by suppressing the amount of solar radiation entering the vehicle cabin.

[0004] Meanwhile, a technique of providing a sunshade to a vehicle to reduce the amount of sunlight entering the vehicle interior through the window glass is known. For example, Patent Document 1 discloses a two-layer shade provided on the rear window. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-206385 Summary of the Invention [Problem to be solved by the invention]

[0006] However, while the shade in Patent Document 1 can reduce the amount of solar radiation, it cannot ventilate the vehicle interior. Therefore, simply providing a shade on the window glass in a vehicle makes it difficult to reduce energy loss due to air conditioning work and extend the driving range.

[0007] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a sunshade device for a vehicle that can reduce energy loss due to air conditioning work and extend the vehicle's cruising range. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a sunshade device for a vehicle, comprising an openable / closable window glass that can be moved between a closed position that closes an opening in the vehicle's window frame and an open position that opens the opening in the window frame, and a shade section that is arranged inside the vehicle to cover the opening in the window frame, wherein the shade section is configured such that a first shade and a second shade are stacked in order from the window frame side with a predetermined gap between them, the first shade has a sheet-like first base material having a predetermined thickness and a plurality of first ventilation holes that penetrate the first base material, and the second shade has a sheet-like second base material having a predetermined thickness and a plurality of second ventilation holes that penetrate the second base material, and when viewed in a plane from the stacking direction of the shade section, the plurality of first ventilation holes are arranged so as to be blocked by the second base material, and the plurality of second ventilation holes are arranged so as to be blocked by the first base material.

[0009] According to the present invention configured as described above, the second base material of the second shade blocks the multiple first ventilation holes of the first shade in a plan view, so that incident light that passes through the multiple first ventilation holes is blocked by the second base material, effectively suppressing the incidence of incident light into the vehicle cabin. Furthermore, according to the present invention, the second shade has multiple second ventilation holes, so that interior air from the vehicle cabin can be discharged from the second ventilation holes through the first ventilation holes to the outside of the vehicle, and outside air can be taken into the vehicle cabin from the first ventilation holes through the second ventilation holes. As a result, by using the vehicle sunshade device of the present invention, occupants can suppress the operation of the air conditioning system, reducing energy loss due to air conditioning work and extending the vehicle's cruising range.

[0010] In the present invention, the shade portion is preferably arranged so that the plurality of first ventilation holes and the plurality of second ventilation holes do not overlap in a plan view. According to the present invention configured in this manner, incident light from outside the vehicle can be prevented from directly reaching the interior of the vehicle compartment through the first ventilation holes and the second ventilation holes.

[0011] In the present invention, preferably, the plurality of first ventilation holes have approximately the same opening area on both sides of the first base material, and the plurality of second ventilation holes have approximately the same opening area on both sides of the second base material. According to the present invention configured in this way, the first shade and the second shade can be easily manufactured.

[0012] In the present invention, the plurality of first ventilation holes and the plurality of second ventilation holes are preferably formed to have approximately the same total volume per unit area of ​​the shade portion. According to the present invention configured in this manner, flow resistance when outside air and inside air pass through the shade portion is reduced, allowing for efficient ventilation.

[0013] In the present invention, preferably, the vehicle has a driver's seat and a passenger seat at the front of the vehicle interior, and rear seats located rearward of the driver's seat and the passenger seat, and the shade portion has, in a plan view, an occupant area located above the driver's seat, the passenger seat, and the rear seat, and a non-occupant area other than the occupant area, and the first ventilation holes and the second ventilation holes are formed so that the opening area of ​​the occupant area is smaller than that of the non-occupant area, and the number of the first ventilation holes and the second ventilation holes per unit area is set to be greater. According to the present invention configured in this way, in the occupant area near where the occupant sits, incident light is suppressed from entering the vehicle cabin, effectively preventing the occupant from being exposed to incident light, while ventilation can be further promoted in the non-occupant area.

[0014] In the present invention, preferably, the shade portion has a vehicle front region and a vehicle rear region in plan view, and the first ventilation holes and the second ventilation holes have different opening areas on a first surface of the first base material and a second surface opposite the first surface, respectively, such that the opening areas on the first surface of the first base material and the second base material are larger than the opening areas on the second surface in the vehicle front region, and the opening areas on the second surface of the first ventilation holes and the second ventilation holes are larger than the opening areas on the first surface in the vehicle rear region. According to the present invention configured in this way, while the vehicle is moving, outside air can be easily drawn into the vehicle through the first ventilation holes and the second ventilation holes in the vehicle front region, and inside air can be easily and effectively discharged to the outside of the vehicle through the first ventilation holes and the second ventilation holes in the vehicle rear region. This improves the ventilation efficiency inside the vehicle.

[0015] In the present invention, preferably, the plurality of first ventilation holes and the plurality of second ventilation holes are formed in approximately the same number per unit area in the vehicle front region and the vehicle rear region, respectively. According to the present invention configured in this manner, it is possible to easily discharge from the vehicle rear region an amount of inside air that is approximately the same as the amount of outside air drawn into the vehicle interior from the vehicle front region.

[0016] In the present invention, preferably, the opening size of the first ventilation hole in the shade portion is set to be approximately the same as the thickness of the first base material, and the opening size of the second ventilation hole is set to be approximately the same as the thickness of the second base material. According to the present invention configured in this way, ventilation through the first ventilation hole and the second ventilation hole can be performed more efficiently.

[0017] In the present invention, the predetermined gap is preferably smaller than the opening dimension of the first ventilation hole. According to the present invention configured in this manner, the outside air taken in through the first ventilation hole can be more efficiently sent to the second ventilation hole through the space of the gap.

[0018] In the present invention, the opening dimension is preferably the length of one side of a square when the first ventilation hole or the second ventilation hole is square in plan view, or the diameter of a circle when the first ventilation hole or the second ventilation hole is circular in plan view. [Effects of the Invention]

[0019] According to the sunshade device for a vehicle of the present invention, it is possible to reduce the energy loss due to air conditioning work and extend the driving range of the vehicle. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a plan view of a vehicle according to an embodiment of the present invention. [Figure 2] 1 is a side view of a vehicle according to an embodiment of the present invention. [Figure 3] 1 is an explanatory diagram of a vehicle sunshade device according to an embodiment of the present invention; [Figure 4] FIG. 2 is a partial plan view of the shade part according to the first embodiment of the present invention. [Figure 5] 1 is a partial cross-sectional view of a shade part according to a first embodiment of the present invention. [Figure 6] 4 is a graph showing the change in ventilation flow rate with respect to the ratio of opening size to thickness according to the first embodiment of the present invention. [Figure 7] FIG. 3 is an explanatory diagram of opening dimensions according to the first embodiment of the present invention. [Figure 8]FIG. 10 is an explanatory diagram of a shade part according to a modified example of the first embodiment of the present invention. [Figure 9] FIG. 10 is an explanatory diagram of a shade part according to another modified example of the first embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory diagram of a planar area of ​​a shade part according to a second embodiment of the present invention. [Figure 11] FIG. 10 is an explanatory diagram of a passenger area of ​​a shade according to a second embodiment of the present invention. [Figure 12] FIG. 10 is an explanatory diagram of a non-occupant area of ​​a shade according to a second embodiment of the present invention. [Figure 13] FIG. 10 is an explanatory diagram of a planar area of ​​a shade part according to a third embodiment of the present invention. [Figure 14] FIG. 10 is an explanatory diagram of a vehicle front area of ​​a shade part according to a third embodiment of the present invention. [Figure 15] FIG. 10 is an explanatory diagram of a vehicle rear region of a shade according to a third embodiment of the present invention. [Figure 16] 10 is a graph showing the change in ventilation flow rate relative to the ratio of opening dimensions according to the third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] [Overall configuration of the device] A vehicle sunshade device according to an embodiment of the present invention will now be described with reference to the accompanying drawings. First, the overall configuration of a vehicle sunshade device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a plan view of a vehicle, FIG. 2 is a side view of the vehicle, and FIG. 3 is an explanatory diagram of the sunshade device. In this embodiment, an example will be described in which the sunshade device of the present invention is applied to a sunroof mounted on the roof of a vehicle. However, the present invention can also be applied to an openable / closable glass window such as a vehicle side window. In the various embodiments below, for ease of understanding, the same elements will be designated by the same reference numerals, and redundant explanations will be omitted. Also, for ease of understanding, the scale and dimensional relationships in the drawings are not necessarily accurate.

[0022] As shown in FIG. 1, a vehicle 1 has a roof 2 provided with a window frame 3. The window frame 3 has an opening 3a that is substantially rectangular in plan view. A transparent, translucent, or opaque window glass 4 is removably attached to the window frame 3. That is, the window glass 4 is configured to be movable between a closed position that closes the opening 3a of the window frame 3 and an open position that opens the opening 3a. An occupant can operate an actuator such as an electric motor by operating a controller (not shown), thereby opening and closing the window glass 4 between the closed position and the open position (see FIG. 3).

[0023] The sunshade device 100 includes a window glass 4 and a shade unit 10 arranged in the vehicle 1 so as to be able to at least partially or completely cover the opening 3a of the window frame 3 regardless of the front or rear position of the window glass 4. In this embodiment, the shade unit 10 is a flexible sheet-like member that is normally stored in a wound state around a roller 31. By operating a controller (not shown), an occupant can activate an actuator 33 such as an electric motor to pull the shade unit 10 from the roller 31 along a rail. The shade unit 10 can be pulled from a storage position where it is stored on the roller 31 to a shielding position where it covers the opening 3a. Alternatively, the shade unit 10 may be configured so that the occupant manually pulls the tip of the shade unit 10 to pull it from the roller 31.

[0024] In this embodiment, as shown in FIG. 3 , the shade unit 10 includes a first shade 11 on the window frame 3 side and a second shade 21 disposed below the first shade 11 with a small gap therebetween. The first shade 11 and the second shade 21 are both sheet-like members having a predetermined thickness and made of a flexible resin material or the like. They are configured to be wound around separate rollers 31. The size of the gap between the first shade 11 and the second shade 21 may be fixed or variable. If the gap is variable, a position adjustment mechanism may be provided to move the first shade 11 and / or the second shade 21 closer to or farther from each other. Such a position adjustment mechanism can adjust the relative positions of the first shade 11 and the second shade 21, for example, by using an electric actuator or manually adjusting the position of the rollers 31.

[0025] [First embodiment] Next, a sunshade device 100 according to a first embodiment will be described with reference to Figs. 4 to 7. Fig. 4 is a partial plan view of the first and second shades, Fig. 5 is a partial cross-sectional view of the first and second shades taken along line VV in Fig. 4, Fig. 6 is a graph showing the change in ventilation flow rate versus the ratio of opening size to thickness, and Fig. 7 is an explanatory diagram of the opening size. Figs. 4 and 5 schematically show the structure of the shade portion 10. Note that Figs. 4(A) and 4(B) show the same planar area. For ease of understanding, Fig. 4 shows parts other than the ventilation holes (i.e., the base material) with diagonal lines.

[0026] In this embodiment, the first shade 11 has a first base material 12, which is a flexible sheet member having a predetermined thickness T1, and a plurality of first ventilation holes 15 that penetrate the first base material 12. Similarly, the second shade 21 has a second base material 22, which is a flexible sheet member having a predetermined thickness T2, and a plurality of second ventilation holes 25 that penetrate the second base material 22. In this embodiment, the first shade 11 and the second shade 21 are formed from the same base material, and the first ventilation holes 15 and the second ventilation holes 25 have the same three-dimensional shape. However, the two shades may be formed from base materials of different materials and may have ventilation holes with different three-dimensional shapes.

[0027] As shown in FIG. 4, in this embodiment, the first shade 11 (FIG. 4(A)) and the second shade 21 (FIG. 4(B)) each have first ventilation holes 15 and second ventilation holes 25, which are rectangular (square) in shape in plan view, arranged alternately in a grid pattern (for example, like a checkerboard pattern). The first ventilation holes 15 and the second ventilation holes 25 have the same opening area. The first ventilation holes 15 and the second ventilation holes 25 are formed at regular intervals over the entire area of ​​the first shade 11 and the second shade 21, respectively. Therefore, the number of first ventilation holes 15 and the number of second ventilation holes 25 per unit area are approximately the same, and the total volume of the multiple first ventilation holes 15 and the multiple second ventilation holes 25 is approximately the same.

[0028] However, in the shade section 10 in which the first shade 11 and the second shade 21 are stacked in the vertical direction (stacking direction), the first ventilation holes 15 and the second ventilation holes 25 are arranged so as not to overlap each other in a plan view. That is, when the shade section 10 is viewed from above, the first ventilation holes 15 are blocked by the second base material 22 of the second shade 21. Conversely, when the shade section 10 is viewed from below, the second ventilation holes 25 are blocked by the first base material 12 of the first shade 11.

[0029] 5, when incident light (sunlight) L enters the shade portion 10 from above, the incident light L is blocked by the first base material 12 of the first shade 11 or the second base material 22 of the second shade 21. As a result, the incident light L cannot enter the vehicle interior.

[0030] The first shade 11 and the second shade 21 have thicknesses T1 and T2, respectively, and are spaced apart via a layered space S of a gap TG. The thicknesses T1 and T2 are typically 0.5 mm to 5.0 mm. Therefore, outside air A0 outside the vehicle and inside air A1 inside the vehicle cabin can move through the first ventilation holes 15, the space S, and the second ventilation holes 25. Therefore, in this embodiment, it is possible to ventilate the vehicle cabin. In particular, while the vehicle 1 is traveling, it is possible to take outside air A0 into the vehicle cabin and discharge inside air A1 outside the vehicle through the shade portion 10. Furthermore, in this embodiment, the plurality of first ventilation holes 15 and the plurality of second ventilation holes 25 are formed so that the total volumes per unit area of ​​the plurality of first ventilation holes 15 and the plurality of second ventilation holes 25 are equal, so that the flow resistance of the outside air A0 and the inside air A1 when they pass through the shade portion 10 is small, allowing for efficient ventilation.

[0031] FIG. 6 shows the results of a simulation of the ventilation volume through the shade while the vehicle is moving. In this computer experiment, it is assumed that the vehicle is moving at a predetermined speed (e.g., 50 km / h) and that a predetermined wind is blowing from front to rear on the shade. The thickness of the shade is set to a predetermined dimension (e.g., 3 mm). The ventilation hole has an opening dimension D. The horizontal axis of FIG. 5 represents T / D, and the vertical axis represents ventilation flow rate (kg / s). The ventilation flow rate is the amount of air flowing into and out of the vehicle cabin.

[0032] Referring to FIG. 6, when T / D = 1 (i.e., the opening dimension D and the shade thickness T are equal), the ventilation flow rate is maximized. Therefore, from this calculation result, in the first shade 11 and the second shade 21, it is preferable to set the opening dimensions D1 and D2 to be approximately the same as the thicknesses T1 and T2 of the first base material 12 and the second base material 22, respectively, in order to improve the ventilation flow rate. Therefore, in the example of FIG. 5, D1 = T1 and D2 = T2 are set. In addition, the inventor has found that setting the gap TG to, for example, 10 mm or more is advantageous for promoting the convection of air between the two shades and increasing the ventilation flow rate. However, the gap TG may be set smaller than the opening dimension D1 (TG < D1). By setting it in this way, it is possible to easily allow the outside air A0 flowing in from the first ventilation hole 15 to directly flow into the vehicle interior through the second ventilation hole 25 corresponding to and adjacent to the first ventilation hole 15.

[0033] Note that FIG. 7 shows the three-dimensional shapes of various ventilation holes. The opening dimension D in this embodiment varies depending on the three-dimensional shape of the ventilation hole. In FIG. 7(A) corresponding to the first embodiment, the ventilation hole has a quadrangular prism shape (rectangular parallelepiped shape) with a square bottom surface and a square top surface. In this case, the opening dimension D is the length of one side of the square. Also, in FIG. 7(B) according to another example, the ventilation hole has a cylindrical shape. In this case, the opening dimension D is the diameter of the circle. Furthermore, in FIG. 7(C) according to another example, the ventilation hole has a frustum of a cone shape. In this case, the opening dimension D is the diameter of the bottom surface (circle). Note that it is not limited to these, and the opening shape of the ventilation hole can have a polygon (triangle, pentagon, ellipse, etc.) or other shapes, and the three-dimensional shape of the ventilation hole may be a frustum of a pyramid shape. Also, for example, the length of one side of a square having the same opening area as the opening area of the ventilation hole may be adopted as the representative opening dimension.

[0034] [Modification Example] Modified examples of the first embodiment will be described with reference to Figs. 8 and 9. Figs. 8 and 9 are partial plan views and partial cross-sectional views of shade sections according to Modified Examples 1 and 2, respectively. Figs. 8(A) and 8(B), and Figs. 9(A) and 9(B) show the same planar area. Fig. 8(C) is a partial cross-sectional view of the shade section 10 taken along line VIII-VIII. Fig. 9(C) is a partial cross-sectional view of the shade section 10 taken along line IX-IX.

[0035] 8(A), 8(B) and 9(A), 9(B), similar to the example in Fig. 4, the first ventilation holes 15 and the second ventilation holes 25 are formed at regular intervals over the entire area of ​​the first shade 11 and the second shade 21, respectively. However, in modified examples 1 and 2, the sizes (opening area, volume) of the first ventilation holes 15 and the second ventilation holes 25 are different from each other.

[0036] In Modification Example 1 (FIG. 8), the first ventilation hole 15 and the second ventilation hole 25 are rectangular parallelepipeds with different opening dimensions. In Modification Example 2 (FIG. 9), the first ventilation hole 15 and the second ventilation hole 25 are cylindrical with different opening dimensions. That is, in Modification Examples 1 and 2, the opening area of ​​the first ventilation hole 15 is larger than the opening area of ​​the second ventilation hole 25. However, even in these cases, as shown in FIGS. 8(C) and 9(C), the first ventilation hole 15 and the second ventilation hole 25 are arranged so as not to overlap in a plan view. Therefore, even in these examples, it is possible to prevent direct sunlight from entering the vehicle interior and ensure a large ventilation flow rate.

[0037] [Second embodiment] Next, a sunshade device 100 according to a second embodiment will be described with reference to Figs. 10 to 12. Fig. 10 is an explanatory diagram of the planar area of ​​the shade, Fig. 11 is a partial plan view and partial cross-sectional view of the occupant area of ​​the shade, and Fig. 12 is a partial plan view and partial cross-sectional view of the non-occupant area of ​​the shade. Figs. 11(A) and 11(B), and Figs. 12(A) and 12(B) show the same planar area. Figs. 11(A), 11(B), 12(A), and 12(B) each have the same area. Fig. 11(C) is a partial cross-sectional view of the shade taken along line XI-XI, and Fig. 12(C) is a partial cross-sectional view of the shade taken along line XII-XII. For ease of understanding, parts other than the ventilation holes (i.e., the base material) are indicated by diagonal lines in Figs. 11(A), 11(B), 12(A), and 12(B).

[0038] In the second embodiment, the shade 10 is divided into a plurality of planar regions, and each region may have ventilation holes with different opening dimensions relative to the other regions. In the second embodiment, the ventilation holes have a rectangular parallelepiped shape, as in the first embodiment. However, the ventilation holes may have a shape other than a rectangular parallelepiped.

[0039] Figure 10 is a plan view of the shade portion 10 in the shielding position, and the shade portion 10 is divided in the vehicle width direction X (lateral direction) into a driver's seat area R1 extending from a position corresponding to above the driver's seat in the vehicle fore-and-aft direction Y, a passenger seat area R3 extending from a position corresponding to above the passenger seat in the vehicle fore-and-aft direction Y, and a central area R2 sandwiched between these areas.

[0040] The driver's seat area R1 is divided into an occupant area RP0 corresponding to a position above the driver P0 in the driver's seat, an occupant area RP1 corresponding to a position above the occupant P1 in the seat behind the driver's seat, and a non-occupant area RN1 between these areas in the vehicle longitudinal direction Y. Similarly, the passenger seat area R3 is divided into an occupant area RP2 corresponding to a position above the occupant P2 in the passenger seat, an occupant area RP3 corresponding to a position above the occupant P3 in the seat behind the passenger seat, and a non-occupant area RN3 between these areas in the vehicle longitudinal direction Y. The central area R2 is also the non-occupant area RN2. In this example, four flat partial areas of the shade section 10 are set as occupant areas, but this is not limited thereto, and any area above any occupant can be set as an occupant area. Note that multiple occupant areas are collectively referred to as the occupant area RP, and multiple non-occupant areas are collectively referred to as the non-occupant area RN. In FIG. 10, the non-occupant area RN is indicated by diagonal lines for ease of understanding.

[0041] Fig. 11(A) shows a portion of the occupant area RP of the first shade 11, and Fig. 12(A) shows a portion of the non-occupant area RN of the first shade 11. Also, Fig. 11(B) shows a portion of the occupant area RP of the second shade 21, and Fig. 12(B) shows a portion of the non-occupant area RN of the second shade 21. Also, Fig. 11(C) shows a portion of the occupant area RP, and Fig. 12(C) shows a portion of the non-occupant area RN.

[0042] In this embodiment, the number of first ventilation holes 15 and the number of second ventilation holes 25 per unit area are approximately the same in each of the passenger area RP and the non-passenger area RN, and the total volumes of the first ventilation holes 15 and the second ventilation holes 25 are approximately the same.

[0043] 11 and 12, the first shade 11 and the second shade 21 have more ventilation holes per unit area in the passenger area RP than in the non-passenger area RN. Therefore, as shown in Fig. 11(A) and Fig. 12(A), in the first shade 11, the first ventilation holes 15 in the passenger area RP are PR The opening area of ​​the first ventilation hole 15 of the non-occupant area RN is PN11(B) and 12(B), the same points as those for the first shade 11 also apply to the second shade 21.

[0044] Furthermore, in the passenger area RP (see FIG. 11C) and the non-passenger area RN (see FIG. 12C), the first ventilation holes 15 PR and second ventilation hole 25 PR , and the first ventilation hole 15 PN and second ventilation hole 25 PN are arranged so as not to overlap each other in a plan view. In this manner, in this embodiment, by setting the opening area of ​​the ventilation holes in the occupant area RP to be larger than that in the non-occupant area RN, the occupant area RP that covers the occupant above is able to suppress solar radiation more efficiently than the non-occupant area RN, and the ventilation efficiency in the non-occupant area RN is improved more than that in the occupant area RP.

[0045] [Third embodiment] Next, a sunshade device 100 according to a third embodiment will be described with reference to Figs. 13 to 16. Fig. 13 is an explanatory diagram of the planar area of ​​the shade section, Fig. 14 is a partial plan view and partial cross-sectional view of the front region of the shade section, Fig. 15 is a partial plan view and partial cross-sectional view of the rear region of the shade section, and Fig. 16 is a graph showing the change in ventilation flow rate versus the ratio of opening dimensions. Figs. 14(A) and 14(B), and Figs. 15(A) and 15(B) show the same planar area. Figs. 14(A), 14(B), 15(A), and 15(B) each have the same area. Fig. 14(C) is a partial cross-sectional view of the shade section taken along line XIV-XIV. Fig. 15(C) is a partial cross-sectional view of the shade section taken along line XV-XV.

[0046] In the third embodiment, the shade portion 10 is divided into a plurality of planar regions, and each region may have ventilation holes formed therein having a different three-dimensional shape relative to the other regions. In the third embodiment, the ventilation holes are shaped as truncated quadrangular pyramids. However, the shape of the ventilation holes may be other than truncated quadrangular pyramids (for example, truncated cones).

[0047] 13 is a plan view of the shade portion 10 in the shielding position, and the shade portion 10 is divided into a driver's seat area R1, a passenger seat area R3, and a central area R2 in the vehicle width direction X, as in Fig. 10. Furthermore, the driver's seat area R1, the central area R2, and the passenger seat area R3 are each divided into a vehicle front area RF and a vehicle rear area RR in the vehicle fore-and-aft direction Y.

[0048] Fig. 14(A) shows a part of the vehicle front region RF of the first shade 11, and Fig. 15(A) shows a part of the vehicle rear region RR of the first shade 11. Fig. 14(B) shows a part of the vehicle front region RF of the second shade 21, and Fig. 15(B) shows a part of the vehicle rear region RR of the second shade 21.

[0049] As shown in Figures 14 and 15, the first shade 11 and the second shade 21 have the same number of ventilation holes per unit area across the vehicle front region RF and the vehicle rear region RR. These ventilation holes are arranged so as not to overlap in a plan view. However, in this embodiment, as shown in Figures 14(C) and 15(C), the ventilation holes formed in the vehicle front region RF and the vehicle rear region RR have different three-dimensional shapes.

[0050] In this embodiment, the number of first ventilation holes 15 and the number of second ventilation holes 25 per unit area are approximately the same in each of the vehicle front region RF and the vehicle rear region RR, and the total volumes of the first ventilation holes 15 and the second ventilation holes 25 are approximately the same.

[0051] That is, in the vehicle front region RF, the first ventilation holes 15 formed in the first shade 11 F and the second ventilation hole 25 formed in the second shade 21. F Both have a three-dimensional shape of an upside-down quadrangular pyramid (regular quadrangular pyramid), and the opening area on the window frame 3 side (upper side) is larger than the opening area on the opposite side (lower side). Meanwhile, in the vehicle rear region RR, the first ventilation holes 15 formed in the first shade 11 R and the second ventilation hole 25 formed in the second shade 21. RBoth have a three-dimensional shape of a quadrangular pyramid (regular truncated pyramid), and the opening area on the window frame 3 side (upper side) is smaller than the opening area on the opposite side (lower side). In this embodiment, the ventilation holes having a three-dimensional shape of a quadrangular pyramid (regular truncated pyramid) are arranged upside down in the vehicle front region RF and the vehicle rear region RR. In this embodiment, unlike the first and second embodiments, D1 and D2 are not equal.

[0052] FIG. 16 shows the results of a simulation of the amount of ventilation through the shade while the vehicle is moving. In this computer experiment, it is assumed that the vehicle 1 is moving at a predetermined speed (e.g., 50 km / h) and that a predetermined amount of wind is blowing from front to rear on the shade. The ventilation holes have an upper opening dimension D1 and a lower opening dimension D2. The horizontal axis of FIG. 16 represents D1 / D2 (the volume of the ventilation holes is constant), and the vertical axis represents the ventilation flow rate (kg / s). The ventilation flow rate is the amount of air flowing into and out of the vehicle cabin (ventilation flow rate).

[0053] Referring to FIG. 16, it can be seen that the ventilation flow rate into the vehicle interior increases when D1 is greater than D2 (D1>D2) rather than when D1 and D2 are the same (D1=D2). Therefore, when taking outside air A0 into the vehicle interior, it is preferable to set the upper opening dimension D1 of the ventilation hole larger than the lower opening dimension D2 (D1>D2). Also, when exhausting inside air A1 to the outside of the vehicle, it is preferable to set the upper opening dimension D1 of the ventilation hole smaller than the lower opening dimension D2 (D1 <D2)。

[0054] Therefore, in this embodiment, in the vehicle front region RF, the first ventilation holes 15 of the first shade 11 F and the second ventilation hole 25 of the second shade 21 F In the vehicle rear region RR, the opening dimension (i.e., opening area) of the first ventilation hole 15 of the first shade 11 is set larger than that of the lower side (D1>D2). R and the second ventilation hole 25 of the second shade 21 RThe opening dimension (i.e., the opening area) is set to be smaller on the upper side than on the lower side (D1 < D2). With this configuration, in the present embodiment, during traveling, outside air A0 can be efficiently taken into the vehicle interior from the vehicle front region RF, and inside air A1 can be efficiently discharged to the outside of the vehicle from the vehicle rear region RR.

[0055] Next, the operation and effects of the vehicle sunshade device 100 according to the present embodiment will be described. The vehicle sunshade device 100 according to the present embodiment includes a switchable window glass 4 that is movable between a closed position for closing the opening 3a of the window frame 3 of the vehicle 1 and an open position for opening the opening 3a of the window frame 3, and a shade portion 10 disposed in the vehicle 1 so as to cover the opening 3a of the window frame 3. The shade portion 10 is configured such that a first shade 11 and a second shade 21 are laminated with a predetermined gap TG therebetween in order from the window frame 3 side. The first shade 11 has a sheet-like first base material 12 having a predetermined thickness T1 and a plurality of first ventilation holes 15 penetrating the first base material 12. The second shade 21 has a sheet-like second base material 22 having a predetermined thickness T2 and a plurality of second ventilation holes 25 penetrating the second base material 22. In a plan view of the shade portion 10 as viewed from the stacking direction, the plurality of first ventilation holes 15 are arranged so as to be blocked by the second base material 22, and the plurality of second ventilation holes 25 are arranged so as to be blocked by the first base material 12.

[0056] According to this embodiment configured as described above, the second base material 22 of the second shade 21 blocks the multiple first ventilation holes 15 of the first shade 11 in a plan view, so that incident light L that passes through the multiple first ventilation holes 15 is blocked by the second base material 22, effectively suppressing the incidence of incident light L into the vehicle cabin. Furthermore, according to this embodiment, the second shade 21 has multiple second ventilation holes 25, so that interior air A1 inside the vehicle cabin can be discharged from the second ventilation holes 25 through the first ventilation holes 15 to the outside of the vehicle, and outside air A0 outside the vehicle can be taken into the vehicle cabin from the first ventilation holes 15 through the second ventilation holes 25. As a result, by using the vehicle sunshade device 100 of this embodiment, the occupant can suppress the operation of the air conditioning system, reducing energy loss due to air conditioning work and extending the cruising range of the vehicle 1.

[0057] In addition, in this embodiment, the shade portion 10 is preferably arranged so that the plurality of first ventilation holes 15 and the plurality of second ventilation holes 25 do not overlap in plan view. According to this embodiment configured in this manner, it is possible to prevent incident light L from outside the vehicle from directly passing through the first ventilation holes 15 and the second ventilation holes 25 and reaching the interior of the vehicle.

[0058] In addition, in this embodiment, preferably, the multiple first ventilation holes 15 have approximately the same opening area on both sides of the first base material 12, and the multiple second ventilation holes 25 have approximately the same opening area on both sides of the second base material 22. According to this embodiment configured in this way, the first shade 11 and the second shade 21 can be easily manufactured.

[0059] In addition, in this embodiment, the plurality of first ventilation holes 15 and the plurality of second ventilation holes 25 are preferably formed to have approximately the same total volume per unit area of ​​the shade portion 10. According to this embodiment configured in this manner, flow resistance when the outside air A0 and the inside air A1 pass through the shade portion 10 is reduced, allowing for efficient ventilation.

[0060] In addition, in the present embodiment, the vehicle 1 preferably has a driver's seat and a passenger seat at the front of the vehicle interior, and rear seats located rearward of the driver's seat and the passenger seat, and the shade portion 10 has, in a plan view, an occupant area portion RP located above the driver's seat, the passenger seat, and the rear seats, and a non-occupant area portion RN other than the occupant area portion RP, and the first ventilation holes 15 and the second ventilation holes 25 are formed so that the opening area of ​​the occupant area portion RP is smaller than that of the non-occupant area portion RN, and the number of the first ventilation holes 15 and the second ventilation holes 25 per unit area is set to be greater. According to the present embodiment configured in this manner, in the occupant area portion RP near where the occupants sit, the incidence of incident light L into the vehicle cabin is suppressed, effectively preventing the incident light L from hitting the occupants, while the ventilation can be further promoted in the non-occupant area portion RN.

[0061] In addition, in this embodiment, preferably, the shade portion 10 has, in a plan view, a vehicle front region RF and a vehicle rear region RR, and the first ventilation holes 15 and the second ventilation holes 25 have different opening areas on a first surface of the first base material 12 and the second base material 22 facing the window frame 3 and on a second surface opposite to the first surface, and the first ventilation holes 15 and the second ventilation holes 25 are formed so that the opening area on the first surface is larger than the opening area on the second surface in the vehicle front region RF, and the opening area on the second surface is larger than the opening area on the first surface in the vehicle rear region RR. According to this embodiment configured as described above, while the vehicle is traveling, the first ventilation holes 15 in the vehicle front region RF F and second ventilation hole 25 F The first ventilation hole 15 in the rear region RR of the vehicle is easily introduced into the vehicle. R and second ventilation hole 25 R This makes it easier to effectively exhaust the inside air A1 to the outside of the vehicle. As a result, in this embodiment, it is possible to improve the ventilation efficiency inside the vehicle.

[0062] In this embodiment, preferably, the plurality of first ventilation holes 15 and the plurality of second ventilation holes 25 are formed in approximately the same number per unit area in the vehicle front region RF and the vehicle rear region RR. According to this embodiment configured in this manner, it is possible to easily discharge from the vehicle rear region RR an amount of inside air A1 that is approximately the same as the amount of outside air A0 drawn into the vehicle interior from the vehicle front region RF.

[0063] Furthermore, in this embodiment, preferably, the opening dimension D of the first ventilation holes 15 of the shade portion 10 is set to be approximately the same as the thickness T1 of the first base material 12, and the opening dimension D of the second ventilation holes 25 is set to be approximately the same as the thickness T2 of the second base material 22. According to this embodiment configured in this way, ventilation through the first ventilation holes 15 and the second ventilation holes 25 can be performed more efficiently.

[0064] Moreover, in this embodiment, the predetermined gap TG is preferably smaller than the opening dimension D1 of the first ventilation hole 15. According to this embodiment configured in this manner, the outside air A0 taken in through the first ventilation hole 15 can be sent to the second ventilation hole 25 more efficiently through the space S of the gap TG.

[0065] In addition, in this embodiment, the opening dimension D is preferably the length of one side of the square when the first ventilation hole 15 or the second ventilation hole 25 is a square in a planar view, and is preferably the diameter of the circle when the first ventilation hole 15 or the second ventilation hole 25 is a circle in a planar view. [Explanation of symbols]

[0066] 1 vehicle 3 Window Frame 3a opening 4. Window Glass 10 Shade section 11 First Shade 12 First base material 15 First ventilation hole 21 Second Shade 22 Second base material 25 Second ventilation hole 100 Vehicle sunshade device

Claims

1. A sunshade device for a vehicle, an openable window glass that is movable between a closed position that closes an opening in a window frame of a vehicle and an open position that opens the opening in the window frame; a shade portion that is disposed inside the vehicle so as to cover the opening of the window frame, The shade portion is configured by stacking a first shade and a second shade in order from the window frame side with a predetermined gap therebetween, the first shade includes a sheet-like first base material having a predetermined thickness and a plurality of first ventilation holes penetrating the first base material; the second shade includes a sheet-like second base material having a predetermined thickness and a plurality of second ventilation holes penetrating the second base material, A sunshade device for a vehicle, wherein, in a plan view of the shade portion from the stacking direction, the plurality of first ventilation holes are arranged so as to be blocked by the second base material, and the plurality of second ventilation holes are arranged so as to be blocked by the first base material.

2. The vehicle sunshade device according to claim 1 , wherein the shade portion is arranged such that the first ventilation holes and the second ventilation holes do not overlap in a plan view.

3. 2. The vehicle sunshade device according to claim 1, wherein the plurality of first ventilation holes have approximately the same opening area on both sides of the first base material, and the plurality of second ventilation holes have approximately the same opening area on both sides of the second base material.

4. The vehicle sunshade device according to claim 1 , wherein the plurality of first ventilation holes and the plurality of second ventilation holes are formed to have substantially the same total volume per unit area of ​​the shade portion.

5. The vehicle has a driver's seat and a passenger seat at the front of the vehicle, and a rear seat located rearward of the driver's seat and the passenger seat, the shade portion has, in a plan view, an occupant area portion located above the driver's seat, the passenger seat, and the rear seat, and a non-occupant area portion other than the occupant area portion, 2. The vehicle sunshade device according to claim 1, wherein the first ventilation holes and the second ventilation holes are formed to have smaller opening areas in the occupant area than in the non-occupant area, and the number of the first ventilation holes and the second ventilation holes per unit area is set to be greater.

6. The shade portion has a vehicle front region portion and a vehicle rear region portion in a plan view, The first ventilation hole and the second ventilation hole have opening areas on a first surface of the first base material and a second surface of the second base material on the window frame side that are different from each other, and 2. The vehicle sunshade device according to claim 1, wherein the first ventilation hole and the second ventilation hole are formed such that the opening area of ​​the first surface is larger than the opening area of ​​the second surface in the vehicle front region, and the opening area of ​​the second surface is formed such that the opening area of ​​the second surface is larger than the opening area of ​​the first surface in the vehicle rear region.

7. 7. The vehicle sunshade device according to claim 6, wherein the plurality of first ventilation holes and the plurality of second ventilation holes are formed in approximately the same number per unit area in the vehicle front region and the vehicle rear region, respectively.

8. 2. The vehicle sunshade device according to claim 1, wherein the opening dimension of the first ventilation hole of the shade portion is set to be approximately the same as the thickness of the first base material, and the opening dimension of the second ventilation hole of the shade portion is set to be approximately the same as the thickness of the second base material.

9. The sunshade device for a vehicle according to claim 1 , wherein the predetermined gap is smaller than an opening dimension of the first ventilation hole.

10. 10. The vehicle sunshade device according to claim 8, wherein the opening dimension is the length of one side of the square when the first ventilation hole or the second ventilation hole is a square in a plan view, and is the diameter of the circle when the first ventilation hole or the second ventilation hole is a circle in a plan view.

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