JP2020079029A - Vehicular wheel - Google Patents

Vehicular wheel Download PDF

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JP2020079029A
JP2020079029A JP2018213416A JP2018213416A JP2020079029A JP 2020079029 A JP2020079029 A JP 2020079029A JP 2018213416 A JP2018213416 A JP 2018213416A JP 2018213416 A JP2018213416 A JP 2018213416A JP 2020079029 A JP2020079029 A JP 2020079029A
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wheel
spoke
circumferential direction
opening
axial direction
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JP7044036B2 (en
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祐治 室
Yuji Muro
祐治 室
創太 藤原
Sota Fujiwara
創太 藤原
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Toyota Motor Corp
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Abstract

To provide a vehicular wheel, which is configured so that air resistance caused by arranging a protruding part can be reduced.SOLUTION: A spoke 40 has a spoke-circumferential intermediate part 41 and spoke-circumferential end parts 42 positioned at end parts near opening parts 50 at both sides in a wheel circumferential direction of the spoke-circumferential intermediate part and comprising protruding parts 43 protruding to outside in a wheel shaft direction. The protruding parts 43 have opening part side surfaces 43a, surfaces near the opening parts 50 and spoke center side surfaces 43b, whose angles formed with the wheel shaft direction are larger than angles formed by the opening part side surfaces 43a and the direction, which lead at a tilt angle to an outer side surface 41a in the wheel shaft direction of the spoke-circumferential intermediate part 41. In the protruding parts 43, sides thereof closer to outside in a wheel radial direction become wider in wheel circumferential width and become lower in height in the wheel shaft direction, and in the spoke center side surfaces 43b of the protruding parts 43, the angles formed with the wheel shaft direction become larger toward outside in the wheel radial direction.SELECTED DRAWING: Figure 3

Description

本発明は、スポークの開口部側の端部にホイール軸方向外側に突出する突出部が設けられている、車両用ホイールに関する。   TECHNICAL FIELD The present invention relates to a vehicle wheel in which a protruding portion that protrudes outward in the wheel axial direction is provided at an end portion on the opening side of a spoke.

特開２０１８−０２０６４０号公報は、スポークの開口部側の端部にホイール軸方向外側に突出する突出部（突起部）を設け、突出部の裏側に渦を発生させてブレーキ冷却風の風速（風量）を増加させる技術を開示している。図７に示すように、上記公報開示の突出部３は、開口部側の面である開口部側面３ａと、ホイール周方向で開口部側面３ａと反対側にあるスポーク中央側面３ｂと、開口部側面３ａとスポーク中央側面３ｂのホイール軸方向外側端同士を連結する上面３ｃと、を有している。   In Japanese Patent Laid-Open No. 2018-020640, a protrusion (projection) that protrudes outward in the wheel axial direction is provided at the end of the spoke on the side of the opening, and a vortex is generated on the back side of the protrusion to generate a wind speed of the brake cooling air ( A technique for increasing the air volume) is disclosed. As shown in FIG. 7, the protrusion 3 disclosed in the above publication includes an opening side surface 3a which is a surface on the opening side, a spoke central side surface 3b on the side opposite to the opening side surface 3a in the wheel circumferential direction, and an opening portion. It has a side surface 3a and an upper surface 3c that connects the outer ends of the spoke center side surface 3b in the wheel axial direction.

しかし、上記公報開示の車両用ホイールには、つぎの問題点がある。
突出部３のスポーク中央側面３ｂが、突出部３に連なるスポーク部分のホイール軸方向外側面４から直角にホイール軸方向外側に立ち上がる面となっている。そのため、突出部３を設けることによる空気抵抗が大きくなるおそれがある。とくに、ホイール半径方向外側Ｒｏｕｔほど周辺空気に対するホイールの速度が大きいため、ホイール半径方向外側ほど突出部３を設けることによる空気抵抗が大きくなるおそれがある。よって、突出部３を設けることによる空気抵抗を低減する点において改善の余地がある。 However, the vehicle wheel disclosed in the above publication has the following problems.
The spoke central side surface 3b of the protruding portion 3 is a surface that rises to the outer side in the wheel axial direction at a right angle from the outer side surface 4 in the axial direction of the wheel of the spoke portion connected to the protruding portion 3. Therefore, the air resistance due to the provision of the protrusion 3 may increase. In particular, since the speed of the wheel with respect to the surrounding air is higher on the outer side Rout in the wheel radial direction, the air resistance due to the provision of the protrusion 3 may increase on the outer side in the wheel radial direction. Therefore, there is room for improvement in reducing the air resistance due to the provision of the protrusion 3.

特開２０１８−０２０６４０号公報JP, 2018-020640, A

本発明の目的は、従来に比べて、突出部を設けることによる空気抵抗を低減できる、車両用ホイールを提供することにある。 An object of the present invention is to provide a vehicle wheel that can reduce the air resistance due to the provision of the protrusion as compared with the related art.

上記目的を達成する本発明はつぎの通りである。
（１） ハブ取付け部と、
前記ハブ取付け部からホイール半径方向外側に延びる複数のスポークと、
ホイール周方向で複数の前記スポーク間に位置する開口部と、
複数の前記スポークのホイール半径方向外側端部をホイール周方向に連結するディスク外周部と、を有し、
前記スポークが、スポーク周方向中間部と、該スポーク周方向中間部のホイール周方向両側で前記開口部側の端部にあり、ホイール軸方向外側に突出する突出部を備えるスポーク周方向端部と、を有する車両用ホイールであって、
前記突出部は、前記開口部側の面である開口部側面と、ホイール周方向で該開口部側面と反対側にあり前記開口部側面よりもホイール軸方向とのなす角が大とされており前記スポーク周方向中間部のホイール軸方向外側面に傾斜した角度で連なるスポーク中央側面と、を有しており、
前記突出部は、ホイール半径方向外側ほど、ホイール周方向幅が広くなるとともにホイール軸方向高さが低くなっており、
前記突出部のスポーク中央側面は、ホイール軸方向とのなす角がホイール半径方向外側ほど大となっている、車両用ホイール。 The present invention that achieves the above object is as follows.
(1) Hub mounting part,
A plurality of spokes extending from the hub attachment portion to the wheel radial direction outside,
An opening located between the plurality of spokes in the wheel circumferential direction,
A disk outer peripheral portion connecting the wheel radial outer ends of the plurality of spokes in the wheel circumferential direction,
The spoke has a spoke circumferential direction intermediate portion, and a spoke circumferential direction end portion that is provided at both ends of the spoke circumferential direction intermediate portion on the opening side on both sides in the wheel circumferential direction and that has a projecting portion that projects outward in the wheel axial direction. A vehicle wheel having,
The protrusion has an opening side surface that is a surface on the opening side and an opposite side of the opening side surface in the wheel circumferential direction, and the angle formed by the wheel axial direction is larger than that of the opening side surface. A spoke central side surface continuous at an inclined angle to the wheel axial direction outer side surface of the spoke circumferential direction intermediate portion,
The protrusion has a width in the wheel circumferential direction that is wider toward the outer side in the wheel radial direction and a height in the wheel axial direction that is lower,
A vehicle wheel in which the central side surface of the spoke of the protrusion has an angle with the wheel axial direction that increases toward the outside in the radial direction of the wheel.

上記（１）の車両用ホイールによれば、つぎの効果を得ることができる。
（ａ）突出部のスポーク中央側面が、スポーク周方向中間部のホイール軸方向外側面に傾斜した角度で連なるため、突出部のスポーク中央側面がスポーク周方向中間部のホイール軸方向外側面から直角にホイール軸方向外側に立ち上がる面となっている場合に比べて、スポーク周方向中間部のホイール軸方向外側面に沿って流れてきた空気を、スポーク周方向中間部のホイール回転方向後側にある突出部で、スムーズにホイール軸方向外側に向かう流れに変えることができる。よって、突出部を設けることによる空気抵抗を低減できる。 According to the vehicle wheel of (1) above, the following effects can be obtained.
(A) Since the spoke center side surface of the protrusion is continuous with the wheel axial outer side surface of the spoke circumferentially intermediate portion at an angle, the spoke central side surface is perpendicular to the wheel axial outer side surface of the spoke circumferentially intermediate portion. In comparison with the case where the surface rises outward in the wheel axial direction, the air flowing along the outer surface in the wheel axial direction intermediate portion of the spoke circumferential direction is on the rear side in the wheel rotational direction of the intermediate portion of the spoke circumferential direction. With the protrusion, the flow can be smoothly changed to the outside in the axial direction of the wheel. Therefore, the air resistance due to the provision of the protrusion can be reduced.

また、（ｂ）突出部のスポーク中央側面のホイール軸方向とのなす角がホイール半径方向外側ほど大となっているため、周辺空気に対する速度が大きいホイール半径方向外側ほど、スポーク周方向中間部のホイール軸方向外側面に沿って流れてきた空気を、スポーク周方向中間部のホイール回転方向後側にある突出部によって、スムーズにホイール軸方向外側に向かう流れに変えることができる。よって、突出部を設けることによる空気抵抗を低減できる。   Further, (b) since the angle formed between the spoke central side surface of the protrusion and the wheel axial direction is larger toward the outside in the radial direction of the wheel, the outside in the radial direction of the wheel where the speed with respect to the ambient air is higher is closer to the middle portion of the spoke circumferential direction. The air flowing along the outer surface in the axial direction of the wheel can be smoothly changed to a flow outward in the axial direction of the wheel by the protrusion on the rear side in the wheel rotation direction of the intermediate portion in the circumferential direction of the spoke. Therefore, the air resistance due to the provision of the protrusion can be reduced.

また、（ｃ）突出部が、ホイール半径方向外側ほど、ホイール周方向幅が広くなるとともにホイール軸方向高さが低くなっているため、周辺空気に対する速度が大きいホイール半径方向外側ほど、周辺空気が突出部に当たりにくくなる。よって、突出部を設けることによる空気抵抗を低減できる。   Further, since the protrusion (c) has a larger width in the wheel circumferential direction and a lower height in the axial direction of the wheel as it goes outward in the wheel radial direction, the air around the wheel becomes more outward as the speed with respect to the ambient air is higher. Hard to hit the protrusion. Therefore, the air resistance due to the provision of the protrusion can be reduced.

上記（ａ）−（ｃ）により、従来比べて突出部を設けることによる空気抵抗を低減できる。   Due to the above (a)-(c), the air resistance due to the provision of the protrusion can be reduced as compared with the conventional case.

本発明実施例の車両用ホイールの、概略正面図である。It is a schematic front view of the vehicle wheel of the embodiment of the present invention. 図１のＡ−Ａ線部位における模式拡大断面図である。It is a model expanded sectional view in the AA line part of FIG. 本発明実施例の車両用ホイールの、スポークと該スポークのホイール周方向両側にある開口部を示す部分拡大概略斜視図である。It is a partial expanded schematic perspective view which shows the spoke and the opening part on the wheel circumferential direction both sides of this spoke of the vehicle wheel of this invention Example. 図１のＢ−Ｂ線拡大断面図である。It is a BB line expanded sectional view of FIG. 図１のＣ−Ｃ線拡大断面図である。FIG. 2 is an enlarged sectional view taken along line C-C of FIG. 1. 本発明実施例の変形例における車両用ホイールの、概略正面図である。It is a schematic front view of the vehicle wheel in the modification of the Example of this invention. 従来の車両用ホイールの、突出部の斜視図である。It is a perspective view of the protrusion part of the conventional vehicle wheel.

以下に、図面を参照して、本発明実施例の車両用ホイールを説明する。なお、図中において、Ａｏｕｔはホイール軸方向外側（車両の幅方向外側）、Ｒｏｕｔはホイール半径方向外側を示す   A vehicle wheel according to an embodiment of the present invention will be described below with reference to the drawings. In the figure, Aout indicates the wheel axial direction outer side (vehicle width direction outer side), and Rout indicates the wheel radial direction outer side.

本発明実施例の車両用ホイール１０は、図１に示すように、ディスク部２０と、ディスク部２０の裏側にある図示略のリム部と、を有する。リム部は、環状であり、図示略のタイヤを保持する部分である。ホイール１０の内側、すなわち、リム部のホイール半径方向内側かつディスク部２０のホイール軸方向内側には、図示略のハブおよびブレーキが配置されている。   As shown in FIG. 1, the vehicle wheel 10 of the embodiment of the present invention has a disc portion 20 and a rim portion (not shown) on the back side of the disc portion 20. The rim portion is a ring-shaped portion that holds a tire (not shown). A hub and a brake (not shown) are arranged on the inner side of the wheel 10, that is, on the inner side of the rim portion in the wheel radial direction and on the inner side of the disc portion 20 in the wheel axial direction.

ホイール１０は、アルミニウム合金製などの鋳造ホイールであり、ディスク部２０とリム部とが一体成形されているホイールである。ただし、ディスク部２０は、リム部と別体に板（たとえば鋼板）から作製されて、リム部と溶接されていてもよい。ディスク部２０は、金属製材料のみで形成されていてもよく、金属製材料で形成された後に樹脂製部品が取付けられていてもよい。樹脂製部品が取付けられている場合、樹脂製部品も含めてディスク部２０を構成する。   The wheel 10 is a cast wheel made of aluminum alloy or the like, and is a wheel in which the disc portion 20 and the rim portion are integrally molded. However, the disc portion 20 may be made of a plate (for example, a steel plate) separately from the rim portion and welded to the rim portion. The disk portion 20 may be formed of only a metallic material, or a resin component may be attached after being formed of a metallic material. When the resin parts are attached, the disk part 20 is configured including the resin parts.

図示例では、ディスク部２０が、金属製材料で形成された後に樹脂製部品が後述する開口部５０の周縁部に全周にわたって取付けられている場合を示している。ホイール１０は、金属製部品で剛性が確保されたホイール部分１１を作製し、さらに開口部５０の周縁部に樹脂製部品（別部品）１２を追加して、金属製のホイール部分１１のみの場合よりも開口部５０が縮小（小型化）されたホイールとされている。樹脂製部品１２を追加したのは、開口部５０を縮小させて空力性能を向上させるとともに意匠性を高めるためである。なお、樹脂製部品１２を追加せずに金属製材料の量を増加させて開口部５０が縮小（小型化）されたホイールとされていてもよいが、樹脂製部品１２を追加することでホイール１０の軽量化を図っている。   In the illustrated example, the disk portion 20 is formed of a metal material, and then a resin component is attached to the peripheral portion of the opening 50 described later over the entire circumference. In the case of the wheel 10, only the wheel portion 11 made of metal is manufactured by manufacturing the wheel portion 11 whose rigidity is secured by the metal component and further adding the resin component (separate component) 12 to the peripheral portion of the opening 50. The opening 50 is made smaller (smaller) than the wheel. The resin part 12 is added in order to reduce the opening 50 to improve aerodynamic performance and enhance design. Although the opening 50 may be reduced (miniaturized) by increasing the amount of the metal material without adding the resin part 12, the wheel may be added by adding the resin part 12. We are trying to reduce the weight by 10.

ディスク部２０は、図１に示すように、ハブ取付け部３０と、スポーク４０と、開口部５０と、ディスク外周部６０と、を有する。   As shown in FIG. 1, the disc portion 20 has a hub attachment portion 30, spokes 40, openings 50, and a disc outer peripheral portion 60.

ハブ取付け部３０は、ディスク部２０のホイール半径方向中央部とその近傍に設けられる。ハブ取付け部３０のホイール半径方向の中間部には、ホイール１０を図示略のハブに取付けるためのボルト・ナット（ハブ取付けボルトとハブナット）３１が複数配置されている。ボルト・ナット３１の数は、特に限定されるものではないが、ホイール周方向に等間隔にたとえば５個設けられている。   The hub attachment portion 30 is provided in the wheel radial center of the disc portion 20 and in the vicinity thereof. A plurality of bolts and nuts (hub mounting bolts and hub nuts) 31 for mounting the wheel 10 to a hub (not shown) are arranged at an intermediate portion of the hub mounting portion 30 in the wheel radial direction. The number of bolts/nuts 31 is not particularly limited, but, for example, five bolts/nuts 31 are provided at equal intervals in the wheel circumferential direction.

スポーク４０は、ハブ取付け部３０からホイール半径方向外側にディスク外周部６０まで放射状に延びている。スポーク４０は、複数設けられている。スポーク４０は、ホイール周方向に等間隔にたとえば５個設けられている。ただし、スポーク５０の数は５個に限定されるものではなく、複数設けられていれば、３個、４個でもよく、６個以上であってもよい。   The spokes 40 extend radially from the hub mounting portion 30 to the disk outer peripheral portion 60 outward in the wheel radial direction. A plurality of spokes 40 are provided. For example, five spokes 40 are provided at equal intervals in the wheel circumferential direction. However, the number of the spokes 50 is not limited to five, and may be three, four, or six or more as long as a plurality of spokes are provided.

開口部５０は、ホイール周方向に隣り合うスポーク４０，４０の間に位置する。開口部５０は、ディスク部２０をホイール軸方向に貫通する孔である。開口部５０は、ホイール周方向に等間隔に、スポーク４０の数と同数設けられている。ホイール１０の内側からのブレーキ冷却風の少なくとも一部は、開口部５０を通ってホイール１０の外側に排出されるようになっている。   The opening 50 is located between the spokes 40, 40 that are adjacent to each other in the wheel circumferential direction. The opening portion 50 is a hole that penetrates the disc portion 20 in the wheel axial direction. The openings 50 are provided at equal intervals in the circumferential direction of the wheel as many as the spokes 40. At least a part of the brake cooling air from the inside of the wheel 10 is exhausted to the outside of the wheel 10 through the opening 50.

ディスク外周部６０は、ディスク部２０のホイール半径方向外側端部に位置する。ディスク外周部６０は、リング状であり、複数のスポーク４０のホイール半径方向外側端部をホイール周方向に連結する。ディスク外周部６０は、ディスク部２０がリム部と一体成形されている場合、リム部の一部を構成していてもよい。   The disc outer peripheral portion 60 is located at an outer end portion of the disc portion 20 in the wheel radial direction. The disk outer peripheral portion 60 is ring-shaped and connects the outer ends of the plurality of spokes 40 in the wheel radial direction in the wheel circumferential direction. The disc outer peripheral portion 60 may form a part of the rim portion when the disc portion 20 is integrally molded with the rim portion.

スポーク４０は、図２に示すように、スポーク周方向中間部４１と、スポーク周方向端部４２と、を有する。   As shown in FIG. 2, the spoke 40 has a spoke circumferential direction intermediate portion 41 and a spoke circumferential direction end portion 42.

スポーク周方向中間部４１は、スポーク４０のホイール周方向中央部を含む部分であり、スポーク４０のホイール周方向端部を除く部分である。スポーク周方向中間部４１は、金属製部品で剛性が確保されたホイール部分１１にあり、金属製である。   The spoke circumferential direction intermediate portion 41 is a portion including the wheel circumferential direction center portion of the spoke 40, and is a portion excluding the wheel circumferential direction end portion of the spoke 40. The spoke circumferential intermediate portion 41 is located in the wheel portion 11 whose rigidity is ensured by a metal component, and is made of metal.

スポーク周方向端部４２は、スポーク周方向中間部４１のホイール周方向両外側で開口部５０側の端部にある部分である。スポーク周方向端部４２は、樹脂製部品１２で形成されており、樹脂製である。   The spoke circumferential direction end portions 42 are portions located on both sides in the wheel circumferential direction of the spoke circumferential direction intermediate portion 41 at the end portions on the opening 50 side. The spoke circumferential end portions 42 are formed of the resin component 12 and are made of resin.

スポーク周方向端部４２は、図３に示すように、ホイール軸方向外側に突出する突出部４３を有する。突出部４３は、スポーク周方向中間部４１のホイール軸方向外側面４１ａよりも、ホイール軸方向外側に突出する部分である。突出部４３は、開口部５０に沿ってホイール半径方向に連続して延びて設けられている。突出部４３は、ホイール半径方向外側ほど、ホイール周方向幅が広くなるとともにホイール軸方向高さが低くなっている。
突出部４３は、開口部５０側の面である開口部側面４３ａと、ホイール周方向で開口部側面４３ａと反対側（開口部側面４３ａの裏側）にあるスポーク中央側面４３ｂと、を有する。 As shown in FIG. 3, the spoke circumferential direction end portion 42 has a protruding portion 43 protruding outward in the wheel axial direction. The protruding portion 43 is a portion that protrudes outward in the wheel axial direction from the wheel axial outer surface 41 a of the spoke circumferential intermediate portion 41. The protruding portion 43 is provided so as to continuously extend in the wheel radial direction along the opening 50. The protrusion 43 has a width in the wheel circumferential direction that increases toward the outer side in the wheel radial direction and a height in the wheel axial direction that decreases.
The projecting portion 43 has an opening side surface 43a that is a surface on the opening 50 side, and a spoke central side surface 43b that is on the side opposite to the opening side surface 43a in the wheel circumferential direction (the back side of the opening side surface 43a).

開口部側面４３ａは、開口部５０に面している。図４、図５に示すように、ホイール半径方向と直交する断面視で、開口部側面４３ａのホイール軸方向とのなす角は、突出部４３のホイール半径方向の全域にわたって一定であり、ホイール軸方向と平行（略平行を含む）となっている。   The opening side surface 43 a faces the opening 50. As shown in FIGS. 4 and 5, in a cross-sectional view orthogonal to the wheel radial direction, the angle formed by the opening side surface 43a and the wheel axial direction is constant over the entire area of the protrusion 43 in the wheel radial direction. It is parallel to the direction (including substantially parallel).

スポーク中央側面４３ｂは、開口部側面４３ａよりもホイール軸方向とのなす角が大とされており、スポーク周方向中間部４１のホイール軸方向外側面４１ａに傾斜した角度で連なっている。すなわち、スポーク中央側面４３ｂは、スポーク周方向中間部４１のホイール軸方向外側面４１ａから、直角ではなく傾斜した角度（鈍角）θでホイール軸方向外側に立ち上がっている。ホイール半径方向と直交する断面視で、スポーク中央側面４３ｂは、直線状となっていてもよく、図４、図５に示すようにホイール軸方向外側に凸となる凸湾曲形状となっていてもよい。   The spoke central side surface 43b has a larger angle with the wheel axial direction than the opening side surface 43a and is continuous with the wheel axial outer surface 41a of the spoke circumferential intermediate portion 41 at an inclined angle. That is, the spoke central side surface 43b rises outward from the wheel axial direction outer side surface 41a of the spoke circumferential direction intermediate portion 41 at an inclined angle (obtuse angle) θ rather than at a right angle in the wheel axial direction. In a cross-sectional view orthogonal to the wheel radial direction, the spoke central side surface 43b may be linear, or may have a convex curved shape that is convex outward in the wheel axial direction as shown in FIGS. 4 and 5. Good.

ホイール半径方向と直交する断面視で、スポーク中央側面４３ｂのホイール軸方向とのなす角は、ホイール半径方向外側ほど大となっている。すなわち、スポーク中央側面４３ｂは、スポーク周方向中間部４１のホイール軸方向外側面４１ａとのなす角（鈍角）θが、ホイール半径方向外側ほど大となっている。   In a cross-sectional view orthogonal to the wheel radial direction, the angle formed by the spoke central side surface 43b with the wheel axial direction is larger toward the outside in the wheel radial direction. That is, the angle (obtuse angle) θ formed between the spoke central side surface 43b and the wheel axial direction outer side surface 41a of the spoke circumferential direction intermediate portion 41 is larger toward the wheel radial direction outer side.

ホイール半径方向と直交する断面視で、開口部側面４３ａのホイール軸方向外側端とスポーク中央側面４３ｂのホイール軸方向外側端とは、尖った角（点）で接続されていてもよく、湾曲線を介して接続されていてもよく、ホイール軸方向と直交する直線を介して接続されていてもよい。なお、図３〜図５は、尖った角（点）４３ｃで接続されている場合を示し、図２は、ホイール軸方向と直交する直線４３ｄを介して接続されている場合を示している。   In a cross-sectional view orthogonal to the wheel radial direction, the wheel axial outer side end of the opening side surface 43a and the wheel axial outer side end of the spoke central side surface 43b may be connected at a sharp corner (point), and a curved line. May be connected via a straight line which is orthogonal to the wheel axis direction. 3 to 5 show the case where they are connected at a sharp corner (point) 43c, and FIG. 2 shows the case where they are connected via a straight line 43d orthogonal to the wheel axis direction.

つぎに、本発明実施例の作用を説明する。   Next, the operation of the embodiment of the present invention will be described.

（Ａ）車両走行時、すなわちホイール１０の回転時、ホイール１０は、ホイール軸方向外側を流れる走行風（周辺空気）の影響を受ける。そのため、走行風の影響を受けにくくするためには、すなわち空力性能を向上させるためには、ホイール１０の軸方向外側面の平坦面率を拡大するとともに開口部５０を縮小することが望ましい。しかし、開口部５０を縮小すると、ホイール１０内のブレーキ冷却風が開口部５０を通ってホイール１０の外に排出され難くなり、ブレーキ冷却性能が低下してしまう。
そこで、本発明実施例では、スポーク４０の開口部５０側の端部にホイール軸方向外側に突出する突出部４３が設けられている。これにより、図２に示すように、突出部４３のうち、ホイール回転方向で開口部５０の後側にある突出部（ホイール回転方向でスポーク周方向中間部４１の前側にある突出部、以下、第１突出部４３Ａという）の、ホイール回転方向後側に発生する空気の渦Ｖが負圧となり、ホイール１０内のブレーキ冷却風Ｗを開口部５０を通してホイール１０外へ積極的に吸い出すことができる。よって、第１突出部４３Ａによりブレーキ冷却風Ｗの量を増加でき、開口部５０が縮小された場合であってもブレーキ冷却風量を確保できる。よって、空力性能向上とブレーキ冷却風量の確保の両立を図ることができる。 (A) When the vehicle is traveling, that is, when the wheel 10 is rotating, the wheel 10 is affected by the traveling wind (ambient air) flowing outside in the wheel axial direction. Therefore, in order to reduce the influence of traveling wind, that is, in order to improve the aerodynamic performance, it is desirable to increase the flatness of the axially outer side surface of the wheel 10 and reduce the opening 50. However, when the opening 50 is reduced, it becomes difficult for the brake cooling air inside the wheel 10 to be discharged to the outside of the wheel 10 through the opening 50, and the brake cooling performance is deteriorated.
Therefore, in the embodiment of the present invention, the protrusions 43 that protrude outward in the wheel axial direction are provided at the ends of the spokes 40 on the opening 50 side. As a result, as shown in FIG. 2, among the protrusions 43, a protrusion on the rear side of the opening 50 in the wheel rotation direction (a protrusion on the front side of the spoke circumferential direction intermediate portion 41 in the wheel rotation direction, hereinafter, The vortex V of the air generated on the rear side in the wheel rotation direction of the first protrusion 43A) becomes a negative pressure, and the brake cooling air W in the wheel 10 can be positively sucked out of the wheel 10 through the opening 50. .. Therefore, the amount of the brake cooling air W can be increased by the first protrusion 43A, and the amount of the brake cooling air can be secured even when the opening 50 is reduced. Therefore, it is possible to achieve both improvement of aerodynamic performance and securing of the brake cooling air volume.

（Ｂ）突出部４３の開口部側面４３ａのホイール軸方向とのなす角が、突出部４３のホイール半径方向の全域にわたって一定であり、ホイール軸方向と平行（略平行を含む）となっているため、第１突出部４３Ａのホイール回転方向後側に効率よく渦Ｖを発生させることができ、渦Ｖによるブレーキ冷却風Ｗの吸出し効果を効果的に得ることができる。 (B) The angle formed between the opening side surface 43a of the protrusion 43 and the wheel axial direction is constant over the entire region of the protrusion 43 in the wheel radial direction, and is parallel (including substantially parallel) to the wheel axial direction. Therefore, the vortex V can be efficiently generated on the rear side in the wheel rotation direction of the first protruding portion 43A, and the effect of sucking the brake cooling air W by the vortex V can be effectively obtained.

（Ｃ１）図３に示すように、突出部４３のスポーク中央側面４３ｂが、スポーク周方向中間部４１のホイール軸方向外側面４１ａに傾斜した角度（鈍角θ）で連なっている。そのため、スポーク中央側面４３ｂがホイール軸方向外側面４１ａから直角にホイール軸方向外側に立ち上がる面となっている場合（θ＝９０°となっている場合）に比べて、スポーク周方向中間部４１のホイール軸方向外側面４１ａに沿って流れてきた空気を、スポーク周方向中間部４１のホイール回転方向後側にある突出部４３（以下、第２突出部４３Ｂという）によって、スムーズにホイール軸方向外側に向かう流れに変えることができる。よって、突出部４３を設けることによる空気抵抗を低減できる。 (C1) As shown in FIG. 3, the spoke central side surfaces 43b of the protruding portion 43 are connected to the wheel axial outer surface 41a of the spoke circumferential intermediate portion 41 at an inclined angle (obtuse angle θ). Therefore, as compared with the case where the spoke central side surface 43b is a surface which rises to the wheel axial direction outer side at a right angle from the wheel axial direction outer side surface 41a (when θ=90°), the spoke circumferential direction intermediate portion 41 is formed. The air flowing along the wheel axial direction outer surface 41a is smoothly moved to the wheel axial direction outer side by the protrusion 43 (hereinafter referred to as the second protrusion 43B) on the wheel rotation direction rear side of the spoke circumferential direction intermediate portion 41. Can be turned into a flow toward. Therefore, the air resistance due to the provision of the protrusion 43 can be reduced.

（Ｃ２）突出部４３のスポーク中央側面４３ｂのホイール軸方向とのなす角がホイール半径方向外側ほど大となっているため、すなわち、鈍角θがホイール半径方向外側ほど大きくなっているため、周辺空気に対する速度が大きいホイール半径方向外側ほど、ホイール軸方向外側面４１ａに沿って流れてきた空気を、第２突出部４３Ｂによって、スムーズにホイール軸方向外側に向かう流れに変えることができる。よって、突出部４３を設けることによる空気抵抗を低減できる。 (C2) The angle formed between the spoke center side surfaces 43b of the protrusion 43 and the wheel axial direction is larger toward the outside in the wheel radial direction, that is, the obtuse angle θ is larger toward the outside in the wheel radial direction, so that the ambient air The air that has flowed along the wheel axial direction outer side surface 41a can be smoothly changed to a flow that is directed toward the wheel axial direction outer side by the second protruding portion 43B as the speed with respect to the wheel radial direction outer side increases. Therefore, the air resistance due to the provision of the protrusion 43 can be reduced.

（Ｃ３）突出部４３が、ホイール半径方向外側ほど、ホイール周方向幅が広くなるとともにホイール軸方向高さが低くなっているため、周辺空気に対する速度が大きいホイール半径方向外側ほど、周辺空気が突出部４３に当たりにくくなる。よって、突出部４３を設けることによる空気抵抗を低減できる。 (C3) Since the protrusion 43 has a wider width in the wheel circumferential direction and a lower height in the wheel axial direction toward the outside in the wheel radial direction, the peripheral air protrudes toward the outside in the wheel radial direction where the speed with respect to the ambient air is higher. It is difficult to hit the portion 43. Therefore, the air resistance due to the provision of the protrusion 43 can be reduced.

上記（Ｃ１）−（Ｃ３）の複合効果により、突出部４３を設けることによる空気抵抗を効果的に低減できる。   Due to the combined effect of (C1)-(C3), the air resistance due to the provision of the protrusion 43 can be effectively reduced.

（Ｄ）スポーク周方向端部４２が樹脂製であるため、スポーク周方向端部４２がスポーク周方向中間部４１と同様に金属製である場合に比べて、ホイール１０の軽量化を図ることができる。また、樹脂製部品１２が加飾パーツとしても働くため、ホイール１０の意匠性を向上させることができる。 (D) Since the spoke circumferential end portions 42 are made of resin, the weight of the wheel 10 can be reduced as compared with the case where the spoke circumferential end portions 42 are made of metal similarly to the spoke circumferential intermediate portion 41. it can. Moreover, since the resin part 12 also functions as a decorative part, the design of the wheel 10 can be improved.

（Ｅ）スポーク周方向端部４２を含む開口部５０の周縁部が、開口部５０の周縁部の全周にわたって樹脂製部品１２で形成されているため、スポーク周方向中間部４２だけを樹脂製とする場合に比べて、より一層、ホイール１０の軽量化を図ることができる。また、樹脂製部品１２が加飾パーツとしても働くため、ホイール１０の意匠性を向上させることができる。 (E) Since the peripheral portion of the opening 50 including the spoke circumferential end portions 42 is formed of the resin component 12 over the entire circumference of the peripheral portion of the opening 50, only the spoke circumferential intermediate portion 42 is made of resin. It is possible to further reduce the weight of the wheel 10 compared to the case. Moreover, since the resin part 12 also functions as a decorative part, the design of the wheel 10 can be improved.

<本発明実施例の変形例>
図６は、本発明実施例の変形例を示している。
該変形例では、金属製のホイール部分１１のホイール軸方向外側面に、レリーフ７０が施されている場合を示している。その他においては、上記本発明実施例と同様であるため、説明を省略する。 <Modification of the embodiment of the present invention>
FIG. 6 shows a modification of the embodiment of the present invention.
The modified example shows a case where the relief 70 is provided on the outer surface of the metal wheel portion 11 in the wheel axial direction. In other respects, the description is omitted because it is the same as the above-described embodiment of the present invention.

レリーフ７０は、スポーク４０のホイール半径方向外側端部と、これに連なるディスク外周部６０部分に施されている。レリーフ７０は、複数の凹状の比較的細いスリットをホイール半径方向に対して斜めとなる方向に設けることで施されている。すなわち、レリーフ７０は、金属製ホイール部分１１のホイール軸方向外側面（鋳肌面）のホイール半径方向外周部とその近傍に、細い複数のスリットを設けることで、施されている。   The reliefs 70 are provided on the outer ends of the spokes 40 in the radial direction of the wheel and the outer peripheral portion 60 of the disc that is continuous with the outer ends. The relief 70 is formed by providing a plurality of concave relatively thin slits in a direction oblique to the wheel radial direction. That is, the relief 70 is formed by providing a plurality of thin slits on the outer peripheral surface (cast surface) of the metal wheel portion 11 in the wheel axial direction and in the vicinity thereof in the wheel radial direction.

本変形例では、レリーフ７０が設けられているため、ホイール１０を細工の細かいホイールとすることができる。よって、ホイール１０が電気自動車（ＥＶ（Electric Vehicle））に設けられる場合、電気自動車としての精緻感を表現することができる。   In the present modification, since the relief 70 is provided, the wheel 10 can be a finely crafted wheel. Therefore, when the wheel 10 is provided in an electric vehicle (EV), a fine feeling as an electric vehicle can be expressed.

１０ ホイール
１１ 金属製ホイール部分
１２ 樹脂製部品
２０ ディスク部
３０ ハブ取付け部
３１ ボルト・ナット
４０ スポーク
４１ スポーク周方向中間部
４１ａ スポーク周方向中間部のホイール軸方向外側面
４２ スポーク周方向端部
４３ 突出部
４３Ａ 第１突出部
４３Ｂ 第２突出部
４３ａ 突出部の開口部側面
４３ｂ 突出部のスポーク中央側面
５０ 開口部
６０ ディスク外周部
７０ レリーフ 10 Wheel 11 Metal Wheel Part 12 Resin Part 20 Disk Part 30 Hub Attachment Part 31 Bolt/Nut 40 Spoke 41 Spoke Circumferential Intermediate Section 41a Wheel Axial Outer Side 42 of Spoke Circumferential Intermediate Section 42 Spoke Circumferential End 43 Part 43A First protruding part 43B Second protruding part 43a Opening side face 43b of protruding part Spoke central side face 50 of protruding part 60 Opening part 60 Disk outer peripheral part 70 Relief

Claims (1)

ハブ取付け部と、
前記ハブ取付け部からホイール半径方向外側に延びる複数のスポークと、
ホイール周方向で複数の前記スポーク間に位置する開口部と、
複数の前記スポークのホイール半径方向外側端部をホイール周方向に連結するディスク外周部と、を有し、
前記スポークが、スポーク周方向中間部と、該スポーク周方向中間部のホイール周方向両側で前記開口部側の端部にあり、ホイール軸方向外側に突出する突出部を備えるスポーク周方向端部と、を有する車両用ホイールであって、
前記突出部は、前記開口部側の面である開口部側面と、ホイール周方向で該開口部側面と反対側にあり前記開口部側面よりもホイール軸方向とのなす角が大とされており前記スポーク周方向中間部のホイール軸方向外側面に傾斜した角度で連なるスポーク中央側面と、を有しており、
前記突出部は、ホイール半径方向外側ほど、ホイール周方向幅が広くなるとともにホイール軸方向高さが低くなっており、
前記突出部のスポーク中央側面は、ホイール軸方向とのなす角がホイール半径方向外側ほど大となっている、車両用ホイール。 Hub mounting part,
A plurality of spokes extending from the hub attachment portion to the wheel radial direction outside,
An opening located between the plurality of spokes in the wheel circumferential direction,
A disk outer peripheral portion connecting the wheel radial outer ends of the plurality of spokes in the wheel circumferential direction,
The spoke has a spoke circumferential direction intermediate portion, and a spoke circumferential direction end portion that is provided at both ends of the spoke circumferential direction intermediate portion on the opening side on both sides in the wheel circumferential direction and that has a projecting portion that projects outward in the wheel axial direction. A vehicle wheel having,
The protrusion has an opening side surface that is a surface on the opening side and an opposite side of the opening side surface in the wheel circumferential direction, and the angle formed by the wheel axial direction is larger than that of the opening side surface. A spoke central side surface continuous at an inclined angle to the wheel axial direction outer side surface of the spoke circumferential direction intermediate portion,
The protrusion has a width in the wheel circumferential direction that is wider toward the outer side in the wheel radial direction and a height in the wheel axial direction that is lower,
A vehicle wheel in which the central side surface of the spoke of the protrusion has an angle with the wheel axial direction that increases toward the outside in the radial direction of the wheel.
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Citations (7)

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JP2009119955A (en) * 2007-11-13 2009-06-04 Honda Motor Co Ltd Wheel cap and wheel assembly equipped with the same
JP2010132279A (en) * 2008-11-07 2010-06-17 Topy Ind Ltd Automobile wheel disc
US20120080932A1 (en) * 2010-09-29 2012-04-05 GM Global Technology Operations LLC Rim
JP2012224136A (en) * 2011-04-18 2012-11-15 Honda Motor Co Ltd Vehicular wheel
JP2016193693A (en) * 2015-04-01 2016-11-17 トヨタ自動車株式会社 cap
JP2018020640A (en) * 2016-08-02 2018-02-08 トヨタ自動車株式会社 Disc wheel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20313023U1 (en) * 2003-08-21 2003-10-30 Kleemann Gmbh Wheel, for road vehicle, has spokes formed in one piece with hub and shaped so as to act as fan and draw air out of wheel arch
JP2009119955A (en) * 2007-11-13 2009-06-04 Honda Motor Co Ltd Wheel cap and wheel assembly equipped with the same
JP2010132279A (en) * 2008-11-07 2010-06-17 Topy Ind Ltd Automobile wheel disc
US20120080932A1 (en) * 2010-09-29 2012-04-05 GM Global Technology Operations LLC Rim
JP2012224136A (en) * 2011-04-18 2012-11-15 Honda Motor Co Ltd Vehicular wheel
JP2016193693A (en) * 2015-04-01 2016-11-17 トヨタ自動車株式会社 cap
JP2018020640A (en) * 2016-08-02 2018-02-08 トヨタ自動車株式会社 Disc wheel

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