JP2017132304A - Air resistance reduction structure of vehicle - Google Patents

Air resistance reduction structure of vehicle Download PDF

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JP2017132304A
JP2017132304A JP2016012249A JP2016012249A JP2017132304A JP 2017132304 A JP2017132304 A JP 2017132304A JP 2016012249 A JP2016012249 A JP 2016012249A JP 2016012249 A JP2016012249 A JP 2016012249A JP 2017132304 A JP2017132304 A JP 2017132304A
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surface portion
vehicle
air resistance
corner
resistance reduction
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健太郎 小西
Kentaro Konishi
健太郎 小西
尚文 青山
Takafumi Aoyama
尚文 青山
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Daihatsu Motor Co Ltd
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Daihatsu Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/82—Elements for improving aerodynamics

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Abstract

PROBLEM TO BE SOLVED: To reduce air resistance around a prescribed region without largely changing a shape of the prescribed region of a vehicle.SOLUTION: This air resistance reduction structure 1 in which a front face part 4 and a side face part 5 of a vehicle 2 are arranged at an external surface region 3 of the vehicle 2 while being connected to each other via a corner face part 6 has: a plurality of recessed groove parts 13 which are formed at the corner face part 6, and extend toward a rear side from a front side of the corner face part 6; and a plurality of projection parts 14 which are formed at the corner face part 6 while adjoining the recessed groove parts 13, and extend to the rear side from the front side of the corner face part 6. In a state that side faces 13a of the recessed groove parts 13 constitute side faces 14a of the projection parts 14, the recessed groove parts 13 and the projection parts 14 are alternately arranged.SELECTED DRAWING: Figure 2

Description

本発明は、車両の空気抵抗低減構造に関する。   The present invention relates to a structure for reducing air resistance of a vehicle.

例えば自動車における昨今の燃費向上のための技術の一つに、走行時の空気抵抗を低減させる技術が挙げられる。具体的には、自動車の外表面近傍の空気の流れを整えて、剥離現象に起因する空気抵抗の増加を抑制するための研究、開発が進められている。   For example, one of the recent techniques for improving fuel efficiency in automobiles is a technique for reducing air resistance during driving. Specifically, research and development are underway to regulate the flow of air in the vicinity of the outer surface of an automobile and suppress the increase in air resistance caused by the peeling phenomenon.

上記空気抵抗を低減するための手段として、例えば特許文献１には、自動車のルーフ外表面の後端領域に、自動車の前後方向に伸びる所定高さの凸状バンプ（***部）を配置したものが提案されている。   As a means for reducing the air resistance, for example, in Patent Document 1, a convex bump (bump) having a predetermined height extending in the front-rear direction of the automobile is arranged in the rear end region of the outer surface of the automobile roof. Has been proposed.

特開２００４−３４５５６２号公報JP 2004-345562 A

このように、自動車のルーフ後方に生じる剥離現象を抑制するための手段は既に提案がなされている一方、例えばドアミラーなど、自動車の前方側の部位に生じる剥離現象を抑制するための手段について提案がなされたものは従来皆無であった。すなわち、同じ自動車の外表面近傍であっても、その部位によっては、特許文献１に記載のバンプを設けただけでは十分な空気抵抗低減効果を見込めない場合があった。   Thus, while means for suppressing the peeling phenomenon occurring behind the roof of the automobile has already been proposed, a means for suppressing the peeling phenomenon occurring at the front side of the automobile, such as a door mirror, has been proposed. Nothing has been done in the past. That is, even in the vicinity of the outer surface of the same automobile, depending on the portion, there may be a case where a sufficient air resistance reduction effect cannot be expected only by providing the bumps described in Patent Document 1.

例えばドアミラーの場合、図９に示すように、ドアミラー３の外表面のうち車両２の前方を向く前面部４と、前面部４の後方に位置し車両２の前後方向に伸びる上面部５との間のコーナー面部６を曲率半径の大きなＲ面で構成すれば、ドアミラー３まわりの空気の流れＦがドアミラー３の外表面（特に上面部５）に沿って流れやすくなるため、ドアミラー３の後方で生じる渦Ｖを小さくして空気抵抗を低減させることができるようにも思われる。しかしながら、このような構成だと、従来の形状（図９中、一点鎖線で示す形状）に比べてＲ面を大きく構成する分（図９中、斜線を施した部分）だけドアミラー３の前後方向長さを大きくする必要があり、小型化、軽量化、ひいては燃費向上の方針に反する。また、ドアミラー３の形状を大きく変化させることは、ドアミラー３の意匠を変化させることにもつながるため、デザイン面からも好ましくはない。   For example, in the case of a door mirror, as shown in FIG. 9, the front surface portion 4 facing the front of the vehicle 2 on the outer surface of the door mirror 3 and the upper surface portion 5 positioned behind the front surface portion 4 and extending in the front-rear direction of the vehicle 2. If the corner surface portion 6 is configured with an R surface having a large radius of curvature, the air flow F around the door mirror 3 can easily flow along the outer surface (particularly the upper surface portion 5) of the door mirror 3, so It seems that the vortex V produced can be reduced to reduce the air resistance. However, with such a configuration, the front and rear direction of the door mirror 3 is equivalent to a portion (the hatched portion in FIG. 9) that forms the R surface larger than the conventional shape (the shape indicated by the alternate long and short dash line in FIG. 9). It is necessary to increase the length, which is against the policy of miniaturization, weight reduction, and fuel efficiency improvement. Further, greatly changing the shape of the door mirror 3 leads to changing the design of the door mirror 3, which is not preferable from the viewpoint of design.

以上の事情に鑑み、本明細書では、車両の所定部位の形状を大きく変えることなく、所定部位まわりの空気抵抗を低減することを、本発明により解決すべき技術的課題とする。   In view of the above circumstances, in the present specification, it is a technical problem to be solved by the present invention to reduce the air resistance around a predetermined portion without largely changing the shape of the predetermined portion of the vehicle.

前記課題の解決は、本発明に係る車両の空気抵抗低減構造によって達成される。すなわち、この構造は、車両の前方を向いている前面部と、前面部よりも車両の後方に位置し車両の前後方向に伸びている側面部とが、コーナー面部を介してつながってなる車両の外表面部位に設けられている空気抵抗低減構造であって、コーナー面部に設けられ、コーナー面部の前方側から後方側に向けて伸びている複数の凹溝部と、凹溝部に隣接してコーナー面部に設けられ、コーナー面部の前方側から後方側に向けて伸びている複数の凸条部とを有し、凹溝部の側面が凸条部の側面を構成した状態で、凹溝部と凸条部とが交互に配設されている点をもって特徴付けられる。   The solution to the above problem is achieved by the vehicle air resistance reduction structure according to the present invention. That is, in this structure, a front surface portion that faces the front of the vehicle and a side surface portion that is located behind the vehicle and extends in the front-rear direction of the vehicle are connected via a corner surface portion. A structure for reducing air resistance provided on an outer surface portion, a plurality of concave groove portions provided on a corner surface portion and extending from the front side to the rear side of the corner surface portion, and a corner surface portion adjacent to the concave groove portion. And a plurality of ridges extending from the front side to the rear side of the corner surface portion, and the side surfaces of the groove portions constitute the side surfaces of the ridge portions, and the groove portions and the ridge portions. Are characterized by being alternately arranged.

このように、本発明では、車両の外表面のうち、車両の前方を向いている前面部と、前面部よりも車両の後方に位置する側面部との間のコーナー面部に、複数の凹溝部と凸条部とを有する空気抵抗低減構造を設けるようにした。この空気抵抗低減構造の作用効果を図３〜図５に基づき説明する。すなわち、車両の外表面２２が、図４（ａ）に示す如き平面形状をなす場合、外表面２２近傍を流れる空気の速度Ｕは、外表面２２に近づくほど小さくなり、外表面２２で実質的に零となる。そのため、図５（ａ）に示すように、ドアミラー３の前面部から側面部（例えば上面部）を通過してドアミラー３の後方に至る空気の流れＦを考えた場合、側面部で空気の剥離現象が容易に生じ、ドアミラー３の後方で発生する渦Ｖが大きくなる。これに対して、本発明では、前面部と側面部とをつなぐコーナー面部に、その前方側から後方側に向けて伸びている複数の凹溝部と凸条部を設けるようにしたので、例えば図４（ｂ）に示すように、コーナー面部近傍における空気の流れＦは凹溝部１３と凸条部１４の長手方向に沿ったものとなる。また、この際、凹溝部１３の側面１３ａが凸条部１４の側面１４ａを構成した状態で、凹溝部１３と凸条部１４とを交互に配設したので（図３を参照）、凹溝部１３の側面１３ａには、所定方向の渦Ｖａ，Ｖｂが発生する（図４（ｂ）及び図４（ｃ）を参照）。この渦Ｖａ，Ｖｂは、常に側面１３ａ上を下方（凹溝部１３の底部１３ｂ側）から上方（凸条部１４の頂部側）に向けて流れる向きに発生する。そのため、凹溝部１３の幅方向（凹溝部１３及び凸条部１４の長手方向に直交する向きをいう。以下、同じ。）両側に位置する一対の側面１３ａ，１３ａ上に発生する渦Ｖａ，Ｖｂは何れも、凹溝部１３を通過する空気の流れＦを下方（底側）に引き込む向きＣに作用する（図４（ｃ））。   Thus, in the present invention, a plurality of concave groove portions are formed in the corner surface portion between the front surface portion facing the front of the vehicle and the side surface portion positioned rearward of the vehicle from the front surface portion, of the outer surface of the vehicle. And an air resistance reduction structure having protrusions and protrusions. The effect of this air resistance reduction structure is demonstrated based on FIGS. That is, when the outer surface 22 of the vehicle has a planar shape as shown in FIG. 4A, the velocity U of the air flowing in the vicinity of the outer surface 22 decreases as it approaches the outer surface 22. It becomes zero. Therefore, as shown in FIG. 5A, when the air flow F from the front surface portion of the door mirror 3 through the side surface portion (for example, the upper surface portion) to the rear of the door mirror 3 is considered, air separation at the side surface portion. The phenomenon easily occurs, and the vortex V generated behind the door mirror 3 increases. On the other hand, in the present invention, the corner surface portion connecting the front surface portion and the side surface portion is provided with a plurality of concave groove portions and ridge portions extending from the front side toward the rear side. As shown in FIG. 4B, the air flow F in the vicinity of the corner surface portion is along the longitudinal direction of the groove portion 13 and the ridge portion 14. At this time, since the concave groove portions 13 and the convex strip portions 14 are alternately arranged in a state where the side surface 13a of the concave groove portion 13 constitutes the side surface 14a of the convex strip portion 14 (see FIG. 3), the concave groove portion The vortices Va and Vb in a predetermined direction are generated on the side surface 13a of the 13 (see FIG. 4B and FIG. 4C). The vortices Va and Vb are always generated in such a direction as to flow on the side surface 13a from the lower side (the bottom 13b side of the groove 13) toward the upper side (the top side of the ridge 14). Therefore, the vortices Va and Vb generated on the pair of side surfaces 13a and 13a located on both sides of the groove 13 (the direction perpendicular to the longitudinal direction of the groove 13 and the ridge 14; the same applies hereinafter). Both act in a direction C that draws the air flow F passing through the concave groove 13 downward (bottom side) (FIG. 4C).

以上の作用より、上記構成の凹溝部と凸条部とを有する空気抵抗低減構造１をドアミラー３などの前面部と側面部（上面部など）との間のコーナー面部に設けた場合には、コーナー面部上を通過する空気の流れＦをコーナー面部側に引き寄せて、側面部で生じる空気の剥離現象を抑制することができる。これにより、側面部の後方に生じる渦Ｖを小さくして（図５（ｂ））、この渦Ｖに起因する空気抵抗の増加を抑制（すなわち空気抵抗を低減）することが可能となる。   Due to the above action, when the air resistance reduction structure 1 having the concave groove portion and the ridge portion having the above-described configuration is provided on the corner surface portion between the front surface portion and the side surface portion (upper surface portion, etc.) such as the door mirror 3, The air flow F passing over the corner surface portion can be drawn toward the corner surface portion side, and the separation phenomenon of air generated at the side surface portion can be suppressed. Thereby, the vortex V generated behind the side surface portion can be reduced (FIG. 5B), and an increase in air resistance due to the vortex V can be suppressed (that is, the air resistance can be reduced).

また、上記構成の空気抵抗低減構造であれば、前面部と側面部、及びコーナー面部とで構成される車両の外表面部位の形状やサイズ（特に車両の前後方向寸法）をそれほど変えずに済む。そのため、上記部位（ドアミラーなど）の大型化を回避して、軽量化、ひいては燃費向上が可能となる。また、上記部位の形状をそれほど大きく変えずに済むのであれば、意匠の制約を受ける部位であっても問題なく本発明に係る構造を適用することができる。そのため、多くの部位に適用可能となり汎用性が高まる。   Further, with the air resistance reduction structure having the above-described configuration, the shape and size (particularly, the longitudinal dimension of the vehicle) of the outer surface portion of the vehicle constituted by the front surface portion, the side surface portion, and the corner surface portion can be reduced. . For this reason, it is possible to avoid an increase in the size of the part (door mirror or the like), to reduce the weight and to improve the fuel efficiency. In addition, the structure according to the present invention can be applied without any problem even if it is a part subjected to design restrictions, as long as the shape of the part does not have to be changed so much. Therefore, it becomes applicable to many parts and versatility increases.

また、本発明に係る空気抵抗低減構造は、コーナー面部がＲ面で構成されており、かつＲ面の曲率半径が１０ｍｍ以上でかつ８０ｍｍ以下に設定されているものであってもよい。   In the air resistance reducing structure according to the present invention, the corner surface portion may be an R surface, and the radius of curvature of the R surface may be set to 10 mm or more and 80 mm or less.

本発明者らが、本発明の有効性について検証を重ねた結果、上記構成の凹溝部及び凸条部が設けられるコーナー面部をＲ面で構成すると共に、Ｒ面の曲率半径を１０ｍｍ以上でかつ８０ｍｍ以下に設定した場合に、本発明に係る空気抵抗低減構造が有効に作用することが判明した。すなわち、Ｒ面の曲率半径を１０ｍｍ以上とすることで、各凹溝部及び凸条部による十分な剥離抑制効果を得ることが可能となる。一方、Ｒ面の曲率半径があまりに大きいと、空気の流れがコーナー面部とその後方に位置する側面部に沿って生じるため、問題となるような大きな空気の剥離現象が起こらない。以上の理由より、Ｒ面の曲率半径は８０ｍｍ以下に留めておくのがよい。   As a result of repeated verification of the effectiveness of the present invention by the present inventors, the corner surface portion provided with the concave groove portion and the ridge portion having the above-described configuration is configured as an R surface, and the curvature radius of the R surface is 10 mm or more and It was found that the air resistance reduction structure according to the present invention works effectively when set to 80 mm or less. That is, by setting the radius of curvature of the R surface to 10 mm or more, it is possible to obtain a sufficient peeling suppression effect by the respective concave groove portions and convex ridge portions. On the other hand, if the radius of curvature of the R surface is too large, air flow occurs along the corner surface portion and the side surface portion located behind the corner surface portion, so that a large phenomenon of air separation that causes a problem does not occur. For the above reason, it is preferable to keep the radius of curvature of the R surface at 80 mm or less.

以上のように、本発明によれば、車両の所定部位の形状を大きく変えることなく、所定部位まわりにおける空気抵抗の増加を抑制することができる。これにより、所定部位の大型化を図ることなく、車両まわりに生じる空気抵抗を低減することが可能となる。また、意匠の制約を受けやすい部位であっても、容易に車両まわりに生じる空気抵抗を低減することが可能となる。   As described above, according to the present invention, it is possible to suppress an increase in air resistance around a predetermined portion without greatly changing the shape of the predetermined portion of the vehicle. Thereby, it is possible to reduce the air resistance generated around the vehicle without increasing the size of the predetermined portion. Moreover, it is possible to easily reduce the air resistance generated around the vehicle even in a part that is easily subjected to design restrictions.

本発明の一実施形態に係る空気抵抗低減構造を具備した車両の側面図である。1 is a side view of a vehicle provided with an air resistance reduction structure according to an embodiment of the present invention. 図１に示すドアミラーの（ａ）斜視図、（ｂ）平面図、及び（ｃ）側面図である。It is (a) perspective view, (b) top view, and (c) side view of the door mirror shown in FIG. 図２に示す空気抵抗低減構造のＡ−Ａ断面図である。It is AA sectional drawing of the air resistance reduction structure shown in FIG. （ａ）は、空気抵抗低減構造を設けない場合の外表面近傍における空気の流れを示す斜視図、（ｂ）は、空気抵抗低減構造を設けた場合の外表面近傍における空気の流れを示す斜視図、（ｃ）は、図４（ｂ）に示す空気抵抗低減構造を矢印Ｂの向きから見た図である。(A) is a perspective view showing the air flow in the vicinity of the outer surface when the air resistance reduction structure is not provided, and (b) is a perspective view showing the air flow in the vicinity of the outer surface when the air resistance reduction structure is provided. FIG. 4C is a view of the air resistance reduction structure shown in FIG. （ａ）は、空気抵抗低減構造を設けない場合のドアミラー近傍における空気の流れを示す側面図、（ｂ）は、空気抵抗低減構造を設けた場合のドアミラー近傍における空気の流れを示す側面図である。(A) is a side view showing the air flow in the vicinity of the door mirror when the air resistance reduction structure is not provided, and (b) is a side view showing the air flow in the vicinity of the door mirror when the air resistance reduction structure is provided. is there. 空気抵抗低減構造の変形例を示す要部断面図である。It is principal part sectional drawing which shows the modification of an air resistance reduction structure. 本発明の他の実施形態に係る車両の側面図である。It is a side view of the vehicle concerning other embodiments of the present invention. 図７に示す車両の要部斜視図である。It is a principal part perspective view of the vehicle shown in FIG. 本発明に関連する技術に係る車両の要部側面図である。It is a principal part side view of the vehicle which concerns on the technique relevant to this invention.

以下、本発明に係る空気抵抗低減構造の一実施形態を図面に基づき説明する。   Hereinafter, an embodiment of an air resistance reducing structure according to the present invention will be described with reference to the drawings.

図１は、本発明の一実施形態に係る空気抵抗低減構造１を具備した車両２の側面図を示している。図１に示すように、この車両２は、ドアミラー３の外表面に空気抵抗低減構造１を設けてなる。この空気抵抗低減構造１は、図２に示すように、ドアミラー３の外表面のうち、車両２の前方（図１でいえば左側）を向いている前面部４と、前面部４の後方（図１でいえば右側）に位置し、車両２の前後方向に伸びる側面部としての上面部５とをつないでいるコーナー面部６に設けられている。   FIG. 1 shows a side view of a vehicle 2 equipped with an air resistance reduction structure 1 according to an embodiment of the present invention. As shown in FIG. 1, the vehicle 2 is provided with an air resistance reduction structure 1 on the outer surface of a door mirror 3. As shown in FIG. 2, the air resistance reduction structure 1 includes a front part 4 facing the front (left side in FIG. 1) of the vehicle 2, and a rear part ( 1 is provided on a corner surface portion 6 that is connected to an upper surface portion 5 serving as a side surface portion that extends in the front-rear direction of the vehicle 2.

本実施形態では、ドアミラー３の前面部４と上面部５との間のコーナー面部６だけでなく、前面部４と下面部７との間のコーナー面部８に空気抵抗低減構造９が設けられると共に、前面部４と、ドアミラー３の車幅方向（車両２の前後方向に直交する向きをいう。以下、同じ。）外側に位置する外側面部１０と前面部４との間のコーナー面部１１にも空気抵抗低減構造１２が設けられている。以下、前面部４と上面部５との間のコーナー面部６に設けられている空気抵抗低減構造１を例にとって詳述する。   In this embodiment, not only the corner surface portion 6 between the front surface portion 4 and the upper surface portion 5 of the door mirror 3 but also the air resistance reducing structure 9 is provided at the corner surface portion 8 between the front surface portion 4 and the lower surface portion 7. The front surface portion 4 and the door mirror 3 in the vehicle width direction (the direction perpendicular to the front-rear direction of the vehicle 2; the same applies hereinafter) are also applied to the corner surface portion 11 between the outer surface portion 10 and the front surface portion 4 located outside. An air resistance reduction structure 12 is provided. Hereinafter, the air resistance reduction structure 1 provided in the corner surface portion 6 between the front surface portion 4 and the upper surface portion 5 will be described in detail.

この空気抵抗低減構造１は、図２（ａ）に示すように、複数（例えば数十本から数百本）の凹溝部１３と複数の凸条部１４とを有する。これら凹溝部１３と凸条部１４は何れも、コーナー面部６の前方側から後方側に向けて伸びている（特に図２（ｂ）を参照）。   As shown in FIG. 2A, the air resistance reduction structure 1 has a plurality of (for example, several tens to several hundreds) concave groove portions 13 and a plurality of convex strip portions 14. Both the groove 13 and the ridge 14 extend from the front side to the rear side of the corner surface portion 6 (see particularly FIG. 2B).

図３は、図２に示す空気抵抗低減構造１の要部断面図を示している。図３に示すように、複数の凹溝部１３と複数の凸条部１４は幅方向に隣接して交互に配設されている。また、凹溝部１３の側面１３ａは凸条部１４の側面１４ａを構成しており、これにより一定のピッチａで凹溝部１３と凸条部１４とが交互に配設されている。なお、本実施形態では、凸条部１４がコーナー面部６から突出しており、凹溝部１３の底部１３ｂとコーナー面部６とが同一平面上にある場合を例示しているが、これには限られない。例えば凹溝部１３の底部１３ｂと凸条部１４の頂部との高さ方向中間位置にコーナー面部６がある場合など、凹溝部１３の底部１３ｂがコーナー面部６の表面よりも低い位置にあってもよい。さらにいえば、凸条部１４の最外径部がコーナー面部６と同一平面上にあってもよい。   FIG. 3 shows a cross-sectional view of the main part of the air resistance reducing structure 1 shown in FIG. As shown in FIG. 3, the plurality of grooves 13 and the plurality of ridges 14 are alternately arranged adjacent to each other in the width direction. Further, the side surface 13a of the concave groove portion 13 constitutes the side surface 14a of the convex strip portion 14, whereby the concave groove portion 13 and the convex strip portion 14 are alternately arranged at a constant pitch a. In the present embodiment, the ridge portion 14 protrudes from the corner surface portion 6 and the bottom portion 13b of the groove portion 13 and the corner surface portion 6 are on the same plane. However, the present invention is limited to this. Absent. For example, when there is a corner surface portion 6 at the intermediate position in the height direction between the bottom portion 13b of the groove portion 13 and the top portion of the ridge portion 14, even if the bottom portion 13b of the groove portion 13 is lower than the surface of the corner surface portion 6. Good. Furthermore, the outermost diameter portion of the ridge portion 14 may be on the same plane as the corner surface portion 6.

ここで、側面１３ａ（１４ａ）はテーパ状の斜面であり、基準面としてのコーナー面部６に対して所定の角度で傾斜している。また、後述する空気抵抗低減効果を発揮するために、凹溝部１３及び凸条部１４のピッチａと、凹溝部１３の底部１３ｂの幅方向寸法ｂが、凹溝部１３及び凸条部１４のピッチａの０．５倍未満に設定されるのがよく、好ましくは０．２倍未満に設定されるのがよい。   Here, the side surface 13a (14a) is a tapered inclined surface and is inclined at a predetermined angle with respect to the corner surface portion 6 as a reference surface. Moreover, in order to exhibit the air resistance reduction effect mentioned later, the pitch a of the groove part 13 and the convex strip part 14, and the width direction dimension b of the bottom part 13b of the concave groove part 13 are the pitches of the concave groove part 13 and the convex strip part 14. It should be set to less than 0.5 times a, preferably less than 0.2 times.

なお、凹溝部１３の深さ（すなわち凸条部１４のコーナー面部６からの高さ）寸法ｃは任意であるが、あまりに小さいと凹溝部１３及び凸条部１４による空気抵抗の低減効果が十分に得られないおそれがあり、あまりに大きいと凸条部１４自体が空気抵抗となるおそれが生じる。以上の観点から、凹溝部１３の深さ寸法（凸条部１４の高さ寸法）ｃは例えば１ｍｍ以上でかつ８ｍｍ以下に設定されるのがよい。また、この深さ寸法ｃとの兼ね合いで（側面１３ａの傾斜角度との関係で）、凹溝部１３及び凸条部１４のピッチａは例えば２ｍｍ以上でかつ１６ｍｍ以下に設定されるのがよい。   The depth c of the groove 13 (that is, the height from the corner surface portion 6 of the ridge 14) is arbitrary, but if it is too small, the effect of reducing the air resistance by the groove 13 and the ridge 14 is sufficient. If it is too large, the ridges 14 themselves may become air resistance. From the above viewpoint, the depth dimension (height dimension of the ridge 14) c of the groove 13 is preferably set to, for example, 1 mm or more and 8 mm or less. Further, in consideration of the depth dimension c (in relation to the inclination angle of the side surface 13a), the pitch a of the groove 13 and the protrusion 14 is preferably set to 2 mm or more and 16 mm or less, for example.

上記構成の凹溝部１３及び凸条部１４とを有する空気抵抗低減構造１は、コーナー面部６の前後方向のほぼ全域にわたって（正確には前面部４との境界付近から上面部５との境界にかけて）形成されている。   The air resistance reducing structure 1 having the concave groove portion 13 and the convex strip portion 14 having the above-described configuration is provided over almost the entire area in the front-rear direction of the corner surface portion 6 (exactly from the vicinity of the boundary with the front surface portion 4 to the boundary with the upper surface portion 5 ) Is formed.

また、上記構成の空気抵抗低減構造１が設けられているコーナー面部６は、本実施形態では単一のＲ面で構成されている。この場合、Ｒ面の曲率半径は１０ｍｍ以上でかつ８０ｍｍ以下に設定されるのがよく、好ましくは２０ｍｍ以上でかつ８０ｍｍ以下に設定されるのがよい。   In addition, the corner surface portion 6 provided with the air resistance reduction structure 1 having the above-described configuration is configured by a single R surface in the present embodiment. In this case, the radius of curvature of the R surface is preferably set to 10 mm or more and 80 mm or less, and preferably 20 mm or more and 80 mm or less.

以上、前面部４と上面部５との間のコーナー面部６に設けられている空気抵抗低減構造１の詳細を述べたが、他の空気抵抗低減構造９，１２も同様の構成をとり得ることはもちろんである。   The details of the air resistance reduction structure 1 provided in the corner surface portion 6 between the front surface portion 4 and the upper surface portion 5 have been described above, but the other air resistance reduction structures 9 and 12 can have the same configuration. Of course.

次に、上記構成の空気抵抗低減構造１をコーナー面部６に設けることの利点（作用効果）につき説明する。   Next, the advantage (action and effect) of providing the air resistance reducing structure 1 having the above configuration on the corner surface portion 6 will be described.

本発明では、前面部４と側面部としての上面部５とをつなぐコーナー面部６に、その前方側から後方側に向けて伸びている複数の凹溝部１３と凸条部１４を設けるようにした（図２（ａ）及び（ｂ）を参照）。これにより、図１に示す車両２の走行時、コーナー面部６近傍における空気の流れＦは凹溝部１３と凸条部１４の長手方向に沿ったものとなる（図４（ｂ））。また、この際、凹溝部１３の側面１３ａが凸条部１４の側面１４ａを構成した状態で、凹溝部１３と凸条部１４とを交互に配設したので、凹溝部１３の側面１３ａには、所定方向の渦Ｖａ，Ｖｂが発生する（図４（ｂ）及び（ｃ）を参照）。この渦Ｖａ，Ｖｂは、常に側面１３ａ上を下方（底部１３ｂ側）から上方（凸条部１４の頂部側）に向けて流れる向きに発生するため、凹溝部１３の幅方向両側に位置する一対の側面１３ａ、１３ａ上に発生する渦Ｖａ，Ｖｂは何れも、凹溝部１３を通過する空気の流れＦを下方（底側）に引き込む向きＣに作用する（図４（ｃ））。これにより、コーナー面部６まわりの空気の速度Ｕは、コーナー面部６の表面近傍においてもある程度の大きさを維持し（図４（ｂ））、その結果、空気の流れＦがコーナー面部６に沿ったものとなる。これにより、上面部５で生じる空気の剥離現象を抑制することができるので、ドアミラー３の後方に生じる渦Ｖを小さくして（図５（ｂ））、この渦Ｖに起因する空気抵抗の増加を抑制することが可能となる。   In the present invention, the corner surface portion 6 connecting the front surface portion 4 and the upper surface portion 5 as the side surface portion is provided with a plurality of concave groove portions 13 and ridge portions 14 extending from the front side toward the rear side. (See FIGS. 2 (a) and 2 (b)). Thereby, when the vehicle 2 shown in FIG. 1 is traveling, the air flow F in the vicinity of the corner surface portion 6 is along the longitudinal direction of the groove portion 13 and the ridge portion 14 (FIG. 4B). At this time, since the concave groove portions 13 and the convex ridge portions 14 are alternately arranged in a state where the side surfaces 13a of the concave groove portions 13 constitute the side surfaces 14a of the convex strip portions 14, the side surfaces 13a of the concave groove portions 13 Then, vortices Va and Vb in predetermined directions are generated (see FIGS. 4B and 4C). Since the vortices Va and Vb are always generated in the direction of flowing from the lower side (bottom portion 13b side) to the upper side (the top side of the ridge 14) on the side surface 13a, Both of the vortices Va and Vb generated on the side surfaces 13a and 13a act in the direction C in which the air flow F passing through the groove 13 is drawn downward (bottom side) (FIG. 4C). As a result, the velocity U of air around the corner surface portion 6 maintains a certain level even in the vicinity of the surface of the corner surface portion 6 (FIG. 4B), and as a result, the air flow F follows the corner surface portion 6. It will be. As a result, the phenomenon of air separation occurring on the upper surface portion 5 can be suppressed, so that the vortex V generated behind the door mirror 3 is reduced (FIG. 5B), and the air resistance due to the vortex V is increased. Can be suppressed.

また、本発明に係る空気抵抗低減構造１によれば、比較的小さなサイズの凹溝部１３と凸条部１４をコーナー面部６に設けるだけで済むため、前面部４や上面部５はもちろんのことコーナー面部６の形状をそれほど変えなくて済む。これにより、ドアミラー３が車両２の前後方向に増大する事態を回避して、車両２の軽量化、ひいては燃費向上が可能となる。   Further, according to the air resistance reducing structure 1 according to the present invention, it is only necessary to provide the concave groove portion 13 and the ridge portion 14 having a relatively small size on the corner surface portion 6, so that the front surface portion 4 and the upper surface portion 5 are of course. It is not necessary to change the shape of the corner surface portion 6 so much. As a result, the situation in which the door mirror 3 increases in the front-rear direction of the vehicle 2 can be avoided, and the vehicle 2 can be reduced in weight and, consequently, fuel consumption can be improved.

本実施形態では、コーナー面部６をＲ面で構成し、かつＲ面の曲率半径を１０ｍｍ以上でかつ８０ｍｍ以下に設定するようにしたので、この形状のコーナー面部６に上記構成の空気抵抗低減構造１を設けることにより、十分な剥離抑制効果を得ることが可能となる。   In the present embodiment, the corner surface portion 6 is configured as an R surface, and the radius of curvature of the R surface is set to be 10 mm or more and 80 mm or less. By providing 1, it becomes possible to obtain a sufficient peeling suppression effect.

また、本実施形態では、コーナー面部６の前後方向のほぼ全域にわたって凹溝部１３と凸条部１４を設けるようにしたので、コーナー面部６における剥離現象の抑制効果を最大限に享受することができる。従って、空気抵抗のより一層の低減化を図ることが可能となる。   Moreover, in this embodiment, since the recessed groove part 13 and the protruding item | line part 14 were provided over the substantially whole area of the front-back direction of the corner surface part 6, the suppression effect of the peeling phenomenon in the corner surface part 6 can be enjoyed to the maximum. . Therefore, the air resistance can be further reduced.

以上、本発明の一実施形態を説明したが、もちろん空気抵抗低減構造、及びこの構造を具備した車両は、本発明の範囲内において、他の形態を採ることも可能である。   Although one embodiment of the present invention has been described above, it goes without saying that the air resistance reduction structure and the vehicle equipped with this structure can take other forms within the scope of the present invention.

例えば、上記実施形態では、凹溝部１３の側面１３ａをテーパ状の斜面としたが、側面１３ａの形状はこれには限られない。例えば図６に示すように、凹溝部１５の側面１５ａ（すなわち凸条部１６の側面１６ａ）を曲面とすることも可能である。この際、曲面は図６の如く凹曲面であってもよいし、凸曲面であってもよい。   For example, in the above embodiment, the side surface 13a of the groove 13 is a tapered slope, but the shape of the side surface 13a is not limited thereto. For example, as shown in FIG. 6, the side surface 15a of the concave groove portion 15 (that is, the side surface 16a of the ridge portion 16) can be a curved surface. In this case, the curved surface may be a concave curved surface as shown in FIG. 6 or a convex curved surface.

また、上記実施形態では、凹溝部１３及び凸条部１４を、コーナー面部６と前面部４との境界近傍から側面部（上面部５）との境界にかけて形成した場合を例示したが、もちろんこれ以外の形態をとることも可能である。例えば凹溝部１３及び凸条部１４を、コーナー面部６から前面部４の一部に跨って形成してもよく、あるいはコーナー面部６から側面部（例えば上面部５）の一部に跨って形成してもよい。   Further, in the above embodiment, the case where the concave groove portion 13 and the ridge portion 14 are formed from the vicinity of the boundary between the corner surface portion 6 and the front surface portion 4 to the boundary between the side surface portion (upper surface portion 5) is exemplified. It is also possible to take other forms. For example, the concave groove portion 13 and the ridge portion 14 may be formed across the corner surface portion 6 and a part of the front surface portion 4, or formed across the corner surface portion 6 and part of the side surface portion (for example, the upper surface portion 5). May be.

また、以上の説明では、空気抵抗低減構造１，９，１２をドアミラー３のコーナー面部６，８，１１に設けた場合を例示したが、もちろん、ドアミラー３以外の部位に設けることも可能である。図７及び図８はその一例（他の実施形態）に係る空気抵抗低減構造１８を具備した車両２の側面図及び要部斜視図を示している。これらの図に示すように、本実施形態に係る車両２は、バンパー１７の前面部１９と、前面部１９の後方に位置し車両２の前後方向に伸びている側面部２０とをつないでいるコーナー面部２１に、空気抵抗低減構造１８を設けたものである。この場合も、図２等に示す形態と同様、コーナー面部２１に、その前方側から後方側に向けて伸びている複数の凹溝部と凸条部を設けることで、図７に示す車両２の走行時、コーナー面部２１近傍における空気の流れは凹溝部と凸条部の長手方向に沿ったものとなる。また、この際、凹溝部の側面が凸条部の側面を構成した状態で、凹溝部と凸条部とを交互に配設することで、凹溝部の側面に図４に示す如く所定方向の渦が発生する。これにより、バンパー１７まわりの空気の流れが、コーナー面部２１に沿ったものとなり、側面部２０で生じる空気の剥離現象を抑制することができる。これにより、バンパー１７の後方に生じる渦を小さくして、この渦に起因する空気抵抗の増加を抑制することが可能となる。   Moreover, although the case where the air resistance reduction structures 1, 9, and 12 are provided on the corner surface portions 6, 8, and 11 of the door mirror 3 has been illustrated in the above description, it is of course possible to provide the air resistance reduction structures 1, 9, and 12 at portions other than the door mirror 3. . 7 and 8 show a side view and a main part perspective view of the vehicle 2 including the air resistance reducing structure 18 according to an example (another embodiment) thereof. As shown in these drawings, the vehicle 2 according to the present embodiment connects the front surface portion 19 of the bumper 17 and the side surface portion 20 that is located behind the front surface portion 19 and extends in the front-rear direction of the vehicle 2. The air resistance reduction structure 18 is provided on the corner surface portion 21. In this case as well, as in the embodiment shown in FIG. 2 and the like, the corner surface portion 21 is provided with a plurality of concave grooves and ridges extending from the front side toward the rear side, so that the vehicle 2 shown in FIG. At the time of traveling, the air flow in the vicinity of the corner surface portion 21 is along the longitudinal direction of the groove portion and the ridge portion. At this time, in the state where the side surface of the groove portion constitutes the side surface of the ridge portion, the groove portion and the ridge portion are alternately arranged, so that the side surface of the groove portion has a predetermined direction as shown in FIG. A vortex is generated. Thereby, the air flow around the bumper 17 becomes along the corner surface portion 21, and the separation phenomenon of air generated at the side surface portion 20 can be suppressed. As a result, the vortex generated behind the bumper 17 can be reduced, and an increase in air resistance due to the vortex can be suppressed.

なお、ドアミラー３とバンパー１７以外に本発明を適用可能な部位として、例えばフロントピラーやヘッドランプなどを挙げることができる。もちろん、車両２の前方側の部位など、前面部と側面部、及びコーナー面部を有する部位であれば、上記例示の部位に限らず本発明を適用可能なことはもちろんである。   In addition to the door mirror 3 and the bumper 17, examples of the part to which the present invention can be applied include a front pillar and a headlamp. Of course, the present invention is not limited to the parts illustrated above as long as the part has a front part, a side part, and a corner part, such as a part on the front side of the vehicle 2.

１，９，１２，１８ 空気抵抗低減構造
２ 車両
３ ドアミラー
４，１９ 前面部
５，７，１０，２０ 側面部
６，８，１１，２１ コーナー面部
１３，１５ 凹溝部
１４，１６ 凸条部
１３ａ，１４ａ，１５ａ，１６ａ 側面
１７ バンパー 1, 9, 12, 18 Air resistance reduction structure 2 Vehicle 3 Door mirror 4, 19 Front surface portion 5, 7, 10, 20 Side surface portion 6, 8, 11, 21, Corner surface portion 13, 15 Concave groove portion 14, 16 Convex portion 13a , 14a, 15a, 16a Side 17 Bumper

Claims (1)

車両の前方を向いている前面部と、前記前面部よりも前記車両の後方に位置し前記車両の前後方向に伸びている側面部とが、コーナー面部を介してつながってなる前記車両の外表面部位に設けられている空気抵抗低減構造であって、
前記コーナー面部に設けられ、前記コーナー面部の前方側から後方側に向けて伸びている複数の凹溝部と、
前記凹溝部に隣接して前記コーナー面部に設けられ、前記コーナー面部の前方側から後方側に向けて伸びている複数の凸条部とを有し、
前記凹溝部の側面が前記凸条部の側面を構成した状態で、前記凹溝部と前記凸条部とが交互に配設されている車両の空気抵抗低減構造。 An outer surface of the vehicle, in which a front surface portion facing the front of the vehicle and a side surface portion positioned behind the vehicle and extending in the front-rear direction of the vehicle are connected via a corner surface portion. It is an air resistance reduction structure provided at the site,
A plurality of concave groove portions provided on the corner surface portion and extending from the front side to the rear side of the corner surface portion;
A plurality of ridges provided on the corner surface portion adjacent to the concave groove portion and extending from the front side to the rear side of the corner surface portion;
An air resistance reduction structure for a vehicle in which the concave groove portions and the convex ridge portions are alternately arranged in a state where the side surfaces of the concave groove portions constitute the side surfaces of the convex ridge portions.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114630716A (en) * 2019-10-29 2022-06-14 京瓷株式会社 Coating film, motor vehicle, and coating method
CN114641352A (en) * 2019-10-29 2022-06-17 京瓷株式会社 Coating film, motor vehicle and coating method
CN114641352B (en) * 2019-10-29 2024-05-03 京瓷株式会社 Coating film, motor vehicle and coating method

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