Surface structure of plastic products for vehicles

Abstract

To make air-conditioning air blown out from a blowout port of an air conditioner for a vehicle easily flow along a surface of a vehicular resin product.SOLUTION: An instrument panel 15 has a crimp pattern 18 made of a plurality of uneven parts 21 on a surface 17. Each uneven part 21 comprises: a central protrusion part 31 which extends in a blowout direction of air-conditioning air A1 in a state of protruding from a reference surface 22; and a pair of side protrusion parts 51 which protrudes to both sides of the central protrusion part 31 in a width direction from the reference surface 22 and extends in the blowout direction in a state of being connected via a boundary 61 to the central protrusion part 31. A distance from the reference surface 22 of a ridge line 32 in the central protrusion part 31 is HC, and an angle formed by the ridge line 32 to the reference surface 22 is an inclination angle. An upstream part 37 of the central protrusion part 31 is inclined such that the height HC becomes higher as heading toward the downstream, and a downstream part 41 is inclined such that the height HC becomes lower as heading toward the downstream. An inclination angle θU of the ridge line 32 in the upstream part 37 is smaller than an inclination angle θD of the ridge line 32 in the downstream part 41.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a surface structure of a resin product for vehicles having a grain pattern consisting of a plurality of concave and convex portions on its surface. [Background technology]

[0002] In a vehicle equipped with an automotive air conditioner, conditioned air is blown out from an outlet of the vehicle air conditioner. Meanwhile, a resin product for the vehicle, such as an instrument panel, is disposed adjacent to and downstream of the outlet in the blowing direction of the conditioned air.

[0003] Patent Document 1 describes a technique for blowing air for air conditioning from an air outlet so as to flow along the surface of a resin product for vehicles. This technique makes it possible to make the air for air conditioning flow efficiently along the surface by utilizing the Coanda effect.

[0004] Patent Document 2 describes a technique for providing a grain pattern consisting of multiple concave and convex portions on the surface of a resin product for vehicles. This technique makes it possible to prevent the airflow portion formed by the air for air conditioning flowing along the surface of the resin product for vehicles from peeling off from the surface of the resin product for vehicles by the concave and convex portions.

[0005] Therefore, it is conceivable to combine the above two technologies to provide a textured pattern consisting of multiple concave and convex portions on the surface of a resin product for vehicles, and to blow air for air conditioning out of the air outlet so as to follow the surface. This configuration is expected to enhance the Coanda effect and allow the air for air conditioning to flow efficiently along the surface of the resin product for vehicles. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2007-55375 A [Patent Document 2] JP 2006-268824 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, although Patent Document 2 describes providing a plurality of concave and convex portions on the surface of a resin product for vehicles, it does not describe details such as the shape of the concave and convex portions. Therefore, the surface structure of a resin product for vehicles that combines both of the above technologies has room for improvement in terms of making it easier for the air-conditioning air blown out from the air outlet of a vehicle air conditioner to flow along the surface of the resin product for vehicles. [Means for solving the problem]

[0008] The surface structure of a resin product for vehicles that solves the above-mentioned problems is applied to a resin product for vehicles having a portion adjacent to a downstream side of an air outlet of an air conditioning device for a vehicle in a blowing direction of air for conditioning air blown out from the air outlet, and is a surface structure of the resin product for vehicles in which a grain pattern consisting of a plurality of uneven portions is provided on a surface of the portion, and when a virtual plane including flat surfaces at locations on the surface different from the uneven portions is taken as a reference plane and a direction on the reference plane perpendicular to the blowing direction is taken as a width direction, each uneven portion has a central convex portion that protrudes from the reference plane and extends in the blowing direction, and a central convex portion that protrudes from the reference plane to both sides of the central convex portion in the width direction and The nozzle is provided with a pair of side convex portions extending in the blowing direction while being connected to a central convex portion via a boundary portion, and when the distance from the reference plane of each ridge line of the central convex portion and both side convex portions is defined as the height and the angle of the ridge line with respect to the reference plane is defined as the inclination angle, the ridge lines of the upstream portions of the central convex portion and both side convex portions are inclined with respect to the reference plane so that the height becomes higher the further downstream, and the ridge lines of the downstream portions downstream of the upstream portions are inclined with respect to the reference plane so that the height becomes lower the further downstream, and in the central convex portion, the inclination angle of the ridge line in the upstream portion is set smaller than the inclination angle of the ridge line in the downstream portion.

[0009] According to the above configuration, conditioned air is blown out from the air outlet of the vehicle air conditioner. The conditioned air blown out from the air outlet at a location close to the surface of the vehicle resin product flows in the following three types of airflow sections, when roughly classified:

[0010] Within the central convex portion, an airflow portion that flows through the area including the ridge line in the width direction (hereinafter referred to as the "central airflow portion"). An airflow portion (hereinafter referred to as the "side airflow portion") that flows through the region of each side convex portion that includes the ridge line in the width direction.

[0011] - Air flow areas that flow along the boundaries between the central convex part and each side convex part (hereinafter referred to as "boundary air flow areas"). The central airflow section flows (climbs) along the inclined ridgeline of the upstream part of the central convexity, and thus moves further away from the reference plane as it advances downstream. The side airflow sections flow (climbs) along the inclined ridgeline of the upstream part of each side convexity, and thus move further away from the reference plane as it advances downstream.

[0012] When each boundary air current portion crosses over a boundary portion, a small vortex is generated downstream of the boundary portion. When the central airflow section moves from the upstream section to the downstream section of the central convex section, it is sucked toward the reference plane due to the Coanda effect of the vortex. In the downstream section of the central convex section, the sucked central airflow section flows (downwards) along a sloping ridgeline that becomes lower in height the further downstream. In this way, separation of the central airflow section from the downstream section of the central convex section is suppressed.

[0013] In addition, when each side airflow portion moves from the upstream portion to the downstream portion of the corresponding side protrusion, it is sucked toward the reference plane due to the Coanda effect of the vortex. In the downstream portion of each side protrusion, each sucked side airflow portion flows (downwards) along an inclined ridgeline that becomes lower in height the further downstream. In this way, separation of the side airflow portion from the downstream portion of each side protrusion is suppressed.

[0014] Furthermore, because the inclination angle of the ridgeline at the upstream portion of the central convex portion is smaller than the inclination angle of the ridgeline at the downstream portion, the central airflow portion is more likely to ascend the upstream portion and descend the downstream portion when passing through the central convex portion, and therefore the central airflow portion is more likely to flow along the upstream and downstream portions of the central convex portion than when the inclination angle of the ridgeline at the upstream portion of the central convex portion and the inclination angle of the ridgeline at the downstream portion have a different relationship than described above.

[0015] In the above-mentioned surface structure of the resin product for a vehicle, the resin product for a vehicle is preferably an instrument panel, a steering wheel, a steering column, a console or a front pillar garnish.

[0016] According to the above configuration, the air for air conditioning blown out from the air outlet passes through the uneven portion in the grain pattern on the surface of the vehicle resin product, which is one of the instrument panel, the steering wheel, the steering column, the console, and the front pillar garnish. The central air flow portion is sucked in and flows along the downstream portion of the central convex portion due to a vortex generated when the boundary air flow portion overcomes the boundary portion, and each side air flow portion is sucked in and flows along the downstream portion of each side convex portion.

[0017] In the above surface structure of the vehicle resin product, it is preferable that at least the downstream portion of each side convex portion is shaped so as to approach the central convex portion as it progresses downstream. According to the above configuration, the boundary airflow portion that flows along at least the downstream portion of the side convex portion is brought closer to the central convex portion as it moves downstream. When the boundary airflow portion passes over the boundary portion, small vortexes tend to occur downstream of the boundary portion and closer to the central convex portion. As a result, the Coanda effect of the vortexes becomes larger, and it is believed that the central airflow portion is more likely to be sucked in when it moves from the upstream portion to the downstream portion of the central convex portion. Effect of the Invention

[0018] According to the above surface structure of the resin product for a vehicle, the air for air conditioning blown out from the air outlet of the air conditioner for a vehicle can easily flow along the surface of the resin product for a vehicle. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a partial side view showing an embodiment, illustrating the positional relationship between an air outlet of a vehicle air conditioner and an instrument panel as a vehicle resin product. [Diagram 2] 2 is a partial plan view showing the grain pattern on the surface of the instrument panel of FIG. 1. [Diagram 3] 3 is an enlarged plan view showing one concave-convex portion of the grain pattern in FIG. 2. FIG. [Figure 4] FIG. 4 is a side view of the uneven portion in FIG. [Diagram 5] 4 is a front view of the concave-convex portion in FIG. 3, as viewed from the upstream side in the blowing direction of air for air conditioning. [Figure 6] FIG. 4 is a side view showing the uneven portion in the embodiment together with the flow of air for air conditioning. [Figure 7] 3 is a perspective view showing the relationship between one uneven portion of the grain pattern in FIG. 2 and a boundary airflow portion and a vortex flow. FIG. [Figure 8] FIG. 8 is a perspective view showing a central airflow section and a side airflow section in addition to FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of a surface structure of a resin product for a vehicle will be described with reference to the drawings. In the following description, the direction of travel (forward direction) of the vehicle is defined as the front, the direction of reverse travel as the rear, and the height direction as the up-down direction. The vehicle width direction (left-right direction) is defined based on the view of the vehicle from the rear.

[0021] As shown in Fig. 1, a vehicle 10 is equipped with a vehicle air conditioner 12 that adjusts the temperature and humidity inside a vehicle compartment 11. This vehicle air conditioner 12 is configured to dehumidify and cool air blown by a blower fan using an evaporator, and to generate conditioned air A1 having a predetermined temperature and humidity by heating a portion of the cooled air.

[0022] An air outlet 13 for air conditioning air A1 is provided in front of the front seats (driver's seat and passenger seat) within the vehicle interior 11. In this embodiment, the air outlet 13 opens toward the rear of the vehicle 10. The air conditioning air A1 generated by the vehicle air conditioner 12 is blown out rearward from the air outlet 13. Here, the direction in which the air conditioning air A1 is blown out from the air outlet 13, which in this embodiment is the direction from the front to the rear of the vehicle 10, is defined as the blowing direction of the air conditioning air A1.

[0023] Meanwhile, in the vehicle interior 11, an instrument panel 15 is disposed in front of the front seats, at least a surface layer 16 of which is made of a resin material. The instrument panel 15 corresponds to a resin product for a vehicle having a portion adjacent to the downstream side of the air outlet 13 in the blowing direction of the air-conditioning air A1. As shown in Fig. 1, the portion is slightly inclined downward with respect to the blowing direction. More precisely, the portion is gently curved so as to bulge diagonally upward on the downstream side and become lower as it approaches the downstream side.

[0024] 2, a grain pattern 18 consisting of a plurality of uneven portions 21 is provided integrally with the surface layer portion 16 on the surface 17 of the above-mentioned portion of the instrument panel 15. The grain pattern 18 of this embodiment imitates the riblet structure of shark skin as an application example of biomimetics.

[0025] The plurality of concave-convex portions 21 are regularly arranged in the blowing direction and the left-right direction. The plurality of concave-convex portions 21 are formed to have the same shape. Therefore, only one of the concave-convex portions 21 will be described here.

[0026] 3 to 5, the uneven portion 21 includes a central convex portion 31 and a pair of side convex portions 51. Here, in order to explain each part of the uneven portion 21, a reference surface (reference surface 22) is defined. The reference surface 22 is an imaginary plane including a flat surface at a location on the surface 17 different from the uneven portion 21. In addition, the direction perpendicular to the blowing direction on the reference surface 22 is defined as the "width direction".

[0027] <Regarding the central convex portion 31> The central protrusion 31 extends in the blowing direction while protruding upward from the reference surface 22 .

[0028] 5, the portion of central protrusion 31 to the left of ridge line 32 has an inclined surface 33 that slopes downward as it moves leftward from ridge line 32. The portion of central protrusion 31 to the right of ridge line 32 has an inclined surface 34 that slopes downward as it moves rightward from ridge line 32. Therefore, the width of central protrusion 31 (the distance between both inclined surfaces 33, 34) is smallest at the upper end and increases as it approaches reference surface 22.

[0029] 4, the distance of the ridge line 32 of the central convex portion 31 from the reference plane 22 is defined as the "height HC." The highest point of the height HC in the central convex portion 31 is defined as the "peak 35." In the central convex portion 31, the portion upstream of the peak 35 is defined as the "upstream portion 37," and the portion downstream of the peak 35 is defined as the "downstream portion 41."

[0030] 3 and 4, the angle that ridge line 32 makes with reference plane 22 is defined as the inclination angle. The line obtained by projecting ridge line 32 onto reference plane 22 is defined as "projection line 43." Projection line 43 is a straight line extending in the blowing direction on reference plane 22.

[0031] In the upstream portion 37 of the central convex portion 31, the ridge line 32 bulges obliquely upward toward the upstream side and curves gently so as to become higher toward the downstream side. In the upstream portion 37, the height HC of the ridge line 32 is set to be the lowest (zero) at the most upstream portion 38, to become higher toward the downstream side, and to be the highest at the most downstream portion.

[0032] In the downstream portion 41 of the central convex portion 31, the ridgeline 32 bulges diagonally upward toward the downstream side and curves to become lower toward the downstream side. The degree of curvature of the ridgeline 32 in the downstream portion 41 is greater than the degree of curvature of the ridgeline 32 in the upstream portion 37. In the downstream portion 41, the height HC of the ridgeline 32 is set to be highest at the most upstream portion, to become lower toward the downstream side, and to be lowest (zero) at the most downstream portion 42.

[0033] The inclination angle θU of the ridge line 32 in the upstream portion 37 is set to be smaller than the inclination angle θD of the ridge line 32 in the downstream portion 41. In Fig. 4, the inclination angle of the ridge line 32 in the most upstream portion 38 is set to the inclination angle θU, and the inclination angle of the ridge line 32 in the most downstream portion 42 is set to the inclination angle θD.

[0034] <Regarding the side convex portion 51> 3 to 5, the side protrusions 51 protrude from the reference plane 22 to both sides of the central protrusion 31 in the width direction and are spaced apart from each other in the width direction. Each side protrusion 51 extends in the blowing direction while being connected to the central protrusion 31 via a boundary portion 61.

[0035] The two side protrusions 51 are shaped to be plane-symmetrical with each other in the width direction with respect to the projection line 43 . The portion of each side protrusion 51 that is closer to the central protrusion 31 than the ridge line 52 in the width direction has an inclined surface 53 that is inclined with respect to the reference plane 22 so as to become lower from the ridge line 52 toward the central protrusion 31. The inclined surface 53 of each side protrusion 51 is inclined in the opposite direction to the adjacent inclined surfaces 33, 34 of the central protrusion 31. Each inclined surface 53 is inclined with respect to the reference plane 22 at an angle similar to that of the inclined surfaces 33, 34.

[0036] The portion of each side protrusion 51 that is farther from the central protrusion 31 than the ridge line 52 in the width direction has an inclined surface 54 that slopes downward as it moves away from the ridge line 52. Therefore, the width of each side protrusion 51, i.e., the distance between both inclined surfaces 53, 54, is smallest at the upper end and increases as it approaches the reference surface 22. The inclined surface 54 of each side protrusion 51 is inclined more with respect to the reference surface 22 than the inclined surface 53.

[0037] 4, the distance of each ridgeline 52 from the reference plane 22 is defined as "height HS." For each ridgeline 52, the highest point of the height HS is defined as "apex 55." For each side convex portion 51, the portion upstream of the apex 55 is defined as "upstream portion 56," and the portion downstream of the apex 55 is defined as "downstream portion 58."

[0038] The ridge line 52 of each upstream portion 56 bulges diagonally upward toward the upstream side and curves gently so as to become higher toward the downstream side. The height HS of the ridge line 52 in each upstream portion 56 is set to be the lowest (zero) at the most upstream portion 57, to become higher toward the downstream side, and to be the highest at the most downstream portion.

[0039] The ridgeline 52 of each downstream portion 58 is curved so as to bulge diagonally upward toward the downstream side and become lower the further downstream. The degree of curvature (curvature) of the ridgeline 52 of the downstream portion 58 is approximately the same as the degree of curvature (curvature) of the ridgeline 52 of the upstream portion 56. The height HS of the ridgeline 52 in the downstream portion 58 is set so as to be highest at the most upstream portion, to become lower toward the downstream side, and to be lowest (zero) at the most downstream portion 59.

[0040] 3, the upstream portion 56 of each side protrusion 51 is curved so as to bulge slightly in the width direction away from the central protrusion 31. The downstream portion 58 of each side protrusion 51 is curved so as to bulge diagonally downstream from the central protrusion 31 in the width direction, and is shaped to approach the central protrusion 31 as it goes downstream.

[0041] The upstream-most portion 57 of each side convex portion 51 is located downstream of the upstream-most portion 38 of the central convex portion 31. The downstream-most portion 59 of each side convex portion 51 (ridge line 52) is located slightly upstream of the downstream-most portion 42 of the central convex portion 31.

[0042] 4, at the same location in the blowing direction, the height HS of the ridge line 52 of each side convex portion 51 is lower than the height HC of the ridge line 32 of the central convex portion 31. The peak 55 of each side convex portion 51 is located at a lower position than the peak 35 of the central convex portion 31.

[0043] <About Boundary 61> As shown in Figs. 3 to 5, the boundaries 61 are located on both sides of the central convex portion 31 in the width direction. Each boundary portion 61 extends in the blowing direction while protruding from the reference plane 22 between the central convex portion 31 and the side convex portions 51. In the blowing direction, each boundary portion 61 is located between many parts of the central convex portion 31 including the downstream portion 41 and many parts of each side convex portion 51 including the downstream portion 58. In the width direction, each boundary portion 61 is formed so as to become lower as it approaches the middle portion of the ridge lines 32, 52.

[0044] The two boundaries 61 are formed in a shape that is plane-symmetrical with respect to the projection line 43 in the width direction. The upstream-most portion 62 of each boundary portion 61 is located downstream of the upstream-most portion 57 of each side convex portion 51 in the blowing direction. The downstream-most portion 63 of each boundary portion 61 (valley 65) is located between the downstream-most portion 59 of each side convex portion 51 and the downstream-most portion 42 of the central convex portion 31 in the blowing direction.

[0045] Here, the distance of the valley 65 at each boundary 61 from the reference plane 22 is defined as the "height HB" (see FIG. 4). Each valley 65 is a line connecting the points of the boundary 61 with the lowest height HB in the width direction in the blowing direction. In the valley 65 of each boundary 61, the point with the highest height HB is defined as the "peak 64." In each boundary 61, the part upstream of the peak 64 is defined as the "upstream portion 66," and the part downstream of the peak 64 is defined as the "downstream portion 67."

[0046] The valley 65 in the upstream portion 66 bulges obliquely upward on the upstream side and curves gently so as to become higher toward the downstream side. The height HB of the valley 65 in the upstream portion 66 is set to be the lowest (zero) at the most upstream portion 62, to become higher toward the downstream side, and to be the highest at the most downstream portion.

[0047] The valley 65 in the downstream portion 67 bulges diagonally upward toward the downstream side and curves to become lower toward the downstream side. The degree of curvature (curvature) of the valley 65 in the downstream portion 67 is greater than the degree of curvature (curvature) of the valley 65 in the upstream portion 66. The height HB of the valley 65 in the downstream portion 67 is set to be highest at the most upstream portion, lower toward the downstream side, and lowest (zero) at the most downstream portion 63.

[0048] At the same location in the blowing direction, the height HB of the valley 65 at each boundary 61 is lower than the height HC of the ridge 32 at the central convex portion 31. The peak 64 of the valley 65 at each boundary 61 is located at a position lower than the peak 55 of the ridge 52 at each side convex portion 51.

[0049] Next, the operation of the present embodiment configured as described above will be described, along with the effects that accompany the operation. As shown in Fig. 1, a part of an instrument panel 15 is adjacent to the downstream side of the air outlet 13 of the vehicle air conditioner 12. Air-conditioning air A1 is blown out from the air outlet 13 toward the rear of the vehicle 10. The air-conditioning air A1 blown out from a portion of the air outlet 13 that is away upward from the surface 17 of the instrument panel 15 is not easily affected by the grain pattern 18, as shown in Fig. 6, and flows straight downstream along the reference surface 22.

[0050] In contrast, the flow of the conditioning air A1 blown out from a portion of the air outlet 13 close to the top-bottom direction relative to the surface 17 of the instrument panel 15 is easily affected by the unevenness 21 in the grain pattern 18.

[0051] As shown in Figs. 7 and 8, in each of the concave and convex portions 21, the air for air conditioning A1 flows roughly as the following three types of air currents. An airflow portion (hereinafter referred to as "central airflow portion AC") that flows through an area of ​​central convex portion 31 that includes ridge line 32 in the width direction.

[0052] An air flow portion (hereinafter referred to as a "side air flow portion AS") that flows through an area of ​​each side protrusion 51 that includes the ridge line 52 in the width direction. Air currents flowing through each boundary portion 61 (hereinafter referred to as "boundary air currents AB").

[0053] In addition, in order to facilitate the explanation of the operation of this embodiment, FIG. 7 illustrates a state in which the central airflow section AC and the side airflow sections AS are removed from FIG. As shown in Figs. 6 and 8, the central airflow section AC flows (climbs) along the inclined ridge 32 of the upstream portion 37 of the central convex portion 31, and thus moves upward away from the reference plane 22 as it progresses downstream.

[0054] Each side airflow section AS flows (climbs) along the inclined ridge line 52 of the upstream portion 56 of each side protrusion 51, and thus moves upward away from the reference plane 22 as it progresses downstream. Here, if no force is acting on the central airflow section AC to attract it toward the reference surface 22 when the central airflow section AC moves from the upstream section 37 of the central convex portion 31 to the downstream section 41, the central airflow section AC may move upward (separate) from the downstream section 41 as it moves downstream.

[0055] Similarly, if no force is applied to the side airflow section AS sucking it toward the reference surface 22 when the side airflow section AS moves from the upstream section 56 to the downstream section 58 of each side protrusion 51, the side airflow section AS may move upward (separate) from the downstream section 58 as it moves downstream.

[0056] (1) In contrast, in this embodiment, as shown in Figures 6 to 8, when each boundary airflow section AB passes over the boundary section 61, i.e., when it moves from the upstream section 66 to the downstream section 67, small vortex currents VF are generated in many locations downstream of the downstream section 67.

[0057] When the central airflow portion AC moves from the upstream portion 37 of the central convex portion 31 to the downstream portion 41, it is sucked toward the reference plane 22 due to the Coanda effect of the vortex flow VF. In the downstream portion 41, the sucked central airflow portion AC flows (descends) along the inclined ridge line 32 such that the height HC decreases toward the downstream. In this way, separation of the central airflow portion AC from the downstream portion 41 is suppressed.

[0058] Furthermore, when each side air flow section AS moves from the upstream section 56 to the downstream section 58 of each side convex section 51, it is sucked toward the reference plane 22 due to the Coanda effect of the vortex flow VF. In the downstream section 58 of each side convex section 51, each sucked side air flow section AS flows (goes down) along the inclined ridge line 52 such that the height HS decreases toward the downstream. In this way, separation of the side air flow section AS from each downstream section 58 is suppressed.

[0059] (2) Furthermore, as shown in Fig. 4, the inclination angle θU of the ridge line 32 in the upstream portion 37 is smaller than the inclination angle θD of the ridge line 32 in the downstream portion 41. Therefore, when the central airflow portion AC passes through the central convex portion 31, it is more likely to ascend the upstream portion 37 and descend the downstream portion 41. Therefore, the central airflow portion AC is more likely to flow along the upstream portion 37 and the downstream portion 41 than when the inclination angles θU and θD have a relationship other than that described above.

[0060] (3) As shown in Fig. 3, at least the downstream portion 58 of each side convex portion 51 is formed in a shape that approaches the central convex portion 31 as it moves downstream. As shown in Figs. 6 to 8, the boundary air current portion AB that flows along the downstream portion 58 approaches the central convex portion 31 as it moves downstream. When the boundary air current portion AB passes over the boundary portion 61 (passes the peak portion 64), a small vortex flow VF is likely to occur at a location closer to the central convex portion 31. As a result, the Coanda effect of the vortex flow VF becomes larger, and it is considered that the central air current portion AC is more likely to be sucked in when it moves from the upstream portion 37 of the central convex portion 31 to the downstream portion 41.

[0061] In addition to the above, the present embodiment provides the following effects. (4) If, at the same point in the blowing direction, the height HC of the ridgeline 32 of the central convex portion 31 is the same as or lower than the height HS of the ridgeline 52 of each side convex portion 51, there is the following concern: the boundary air current portion AB flowing through each boundary portion 61 will cross the central convex portion 31 in the width direction and move to the adjacent boundary portion 61, and mix with the adjacent boundary air current portion AB.

[0062] 4, in this embodiment, at the same location in the blowing direction, ridge line 32 is located at a higher position than ridge line 52. Boundary airflow portion AB is divided into two in the width direction by central convex portion 31. The boundary airflow portions AB flowing through each boundary portion 61 can be prevented from crossing central convex portion 31 in the width direction and mixing with each other.

[0063] (5) Experiments have shown that the greater the height HC of the peak 35 of the central convex portion 31 and the greater the height HS of the peaks 55 of each side convex portion 51, the more likely it is that a vortex VF will occur, and a greater Coanda effect can be expected.

[0064] Therefore, when designing the concave-convex portion 21, it is preferable to set the heights HC, HS of the apexes 35, 55 as high as possible, provided that the height HS of the apex 55 is lower than the height HC of the apex 35.

[0065] However, the grain pattern 18 is originally provided with the intention of improving the appearance and tactile feel of each vehicle resin product, including the instrument panel 15. From this viewpoint, there is an upper limit to the height of the grain pattern 18 that can be expressed. Therefore, it is desirable to set the heights HC, HS of the tops 35, 55 as high as possible without exceeding the upper limit.

[0066] The above embodiment can also be implemented as modified examples as follows: The above embodiment and the following modified examples can be implemented in combination with each other within a range that does not cause technical contradiction.

[0067] <Matters regarding the central protrusion 31> The inclination angle of the ridgeline 32 at a location in the upstream portion 37 that is different from the most upstream portion 38 may be set to the inclination angle θU. Also, the inclination angle of the ridgeline 32 at a location in the downstream portion 41 that is different from the most downstream portion 42 may be set to the inclination angle θD.

[0068] <Matters Concerning Side Convex Part 51> Each side protrusion 51 may extend straight without curving. In this case, each side protrusion 51 may be formed in a shape parallel or nearly parallel to the central protrusion 31. Also, each side protrusion 51 may be formed in a shape inclined with respect to the blowing direction so that it approaches the central protrusion 31 toward the downstream.

[0069] In each curved side convex portion 51, a portion that is formed so as to approach the central convex portion 31 as it approaches downstream may be extended upstream. That is, in addition to the downstream portion 58, the upstream portion 56 may also be a target portion that is formed so as to approach the central convex portion 31 as it approaches downstream. In this case, a part of the upstream portion 56 including the most downstream portion may be targeted, or the entire upstream portion 56 may be targeted.

[0070] <Other> The air outlet 13 may be provided in the instrument panel 15. However, a part of the instrument panel 15 is adjacent to the downstream side of the air outlet 13 in the blowing direction.

[0071] The air outlet 13 may be open in a direction other than the rear of the vehicle 10, for example, in the left / right direction. The above surface structure can also be applied to a resin product for a vehicle other than the instrument panel 15, provided that the resin product has a portion adjacent to the downstream of the air outlet 13 of the vehicle air conditioner 12.

[0072] Applicable resin products for vehicles include vehicle interior parts such as steering wheels, steering columns, consoles, and front pillar garnishes. In the above modified example, the conditioning air A1 blown out from the air outlet 13 passes through the unevenness 21 in the grain pattern 18 on the surface 17 of the vehicle resin product, which is one of the steering wheel, the steering column, the console, or the front pillar garnish. The central airflow portion AC is sucked in and flows along the central convex portion 31 due to the vortex flow VF generated when the boundary airflow portion AB passes over the boundary portion 61, and each side airflow portion AS is sucked in and flows along each side convex portion 51.

[0073] Another example of the corresponding resin product for a vehicle is an exterior vehicle part. In this case, the exterior vehicle part is disposed in a state where at least a part of the exterior vehicle part is adjacent to the downstream of the air outlet 13 of the air conditioner 12 for the vehicle. [Explanation of symbols]

[0074] 10. Vehicle 12...Vehicle air conditioning system 13…Air outlet 15...Instrument panel (plastic products for vehicles) 17…Surface 18...Grain pattern 21...Uneven part 22...Reference plane 31…Central convex part 32,52…Ridgeline 37, 56, 66…Upstream 41,58,67…Downstream 51...Side convex part 61...Border A1…Air for air conditioning HB,HC,HS…Height θD, θU…Inclination angle

Claims

1. A surface structure of a resin product for a vehicle, the surface structure being applied to a resin product for a vehicle having a portion adjacent to a downstream side of an air outlet of an air conditioner for a vehicle in a blowing direction of air for conditioning blown out from the air outlet, the surface structure being provided with a grain pattern consisting of a plurality of uneven portions, When a virtual plane including a flat surface at a location on the surface other than the uneven portion is defined as a reference plane, and a direction perpendicular to the blowing direction on the reference plane is defined as a width direction, Each of the uneven portions includes a central convex portion extending in the blowing direction while protruding from the reference surface, and a pair of side convex portions protruding from the reference surface on both sides of the central convex portion in the width direction and extending in the blowing direction while being connected to the central convex portion via a boundary portion, When the distance from the reference plane to each ridge line of the central convex portion and each of the two side convex portions is defined as a convex portion height, and the angle that the ridge line forms with the reference plane is defined as an inclination angle, the ridge lines of the upstream portions of each of the central convex portion and the two side convex portions are inclined with respect to the reference plane so that the height of the convex portion increases downstream, and the ridge lines of the downstream portions downstream of the upstream portions are inclined with respect to the reference plane so that the height of the convex portion decreases downstream, In the central convex portion, the inclination angle of the ridge line in the upstream portion is set to be smaller than the inclination angle of the ridge line in the downstream portion, A valley line is formed in the boundary portion, the valley line being a line connecting the lowest point in the width direction in the blowing direction, A surface structure of a resin product for a vehicle, in which, when the distance of the valley from the reference plane to the valley is defined as a valley height, the valley in an upstream portion is inclined with respect to the reference plane so that the valley height becomes higher toward downstream, and the valley in a downstream portion downstream of the upstream portion is inclined with respect to the reference plane so that the valley height becomes lower toward downstream.

2. A surface structure of a resin product for a vehicle, the surface structure being applied to a resin product for a vehicle having a portion adjacent to a downstream side of an air outlet of an air conditioner for a vehicle in a blowing direction of air for conditioning blown out from the air outlet, the surface structure being provided with a grain pattern consisting of a plurality of uneven portions, When a virtual plane including a flat surface at a location on the surface other than the uneven portion is defined as a reference plane, and a direction perpendicular to the blowing direction on the reference plane is defined as a width direction, Each of the uneven portions includes a central convex portion extending in the blowing direction while protruding from the reference surface, and a pair of side convex portions protruding from the reference surface on both sides of the central convex portion in the width direction and extending in the blowing direction while being connected to the central convex portion via a boundary portion, When the distance from the reference plane to each ridge line of the central convex portion and each of the two side convex portions is defined as a height and the angle that the ridge line forms with the reference plane is defined as an inclination angle, the ridge lines of the upstream portions of each of the central convex portion and the two side convex portions are inclined with respect to the reference plane so that the height increases toward the downstream side, and the ridge lines of the downstream portions downstream of the upstream portions are inclined with respect to the reference plane so that the height decreases toward the downstream side, In the central convex portion, the inclination angle of the ridge line in the upstream portion is set to be smaller than the inclination angle of the ridge line in the downstream portion, A surface structure of a resin product for a vehicle, wherein at least the downstream portion of each side convex portion is shaped so as to approach the central convex portion the further downstream.

3. 3. The surface structure of a resin product for a vehicle according to claim 1, wherein the resin product for a vehicle is an instrument panel, a steering wheel, a steering column, a console or a front pillar garnish.

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