JP2010095147A

JP2010095147A - Vehicle wheel

Info

Publication number: JP2010095147A
Application number: JP2008267557A
Authority: JP
Inventors: Yoichi Kamiyama; 洋一神山; Katsushi Ishii; 克史石井; Hisamitsu Takagi; 久光高木
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2008-10-16
Filing date: 2008-10-16
Publication date: 2010-04-30

Abstract

【課題】製造コストを高騰させることがなく量産性を向上させることが可能な車両用ホイールを提供すること。
【解決手段】副気室部材１８は、内部に第１副気室４０ａが形成された第１副気室部１８ａと、内部に第２副気室４０ｂが形成され連結部３８を介して前記第１副気室部１８ａと長手方向に沿って連結された第２副気室部１８ｂと、前記連結部３８に近接する前記第１副気室部１８ａに設けられ、前記第１副気室４０ａとタイヤ空気室２０とを連通させる第１連通孔４４ａを有する第１突出部３４ａと、前記連結部３８とは反対側の前記第２副気室部１８ｂの長手方向に沿った一端部に設けられ、前記第２副気室４０ｂと前記タイヤ空気室２０とを連通させる第２連通孔４４ｂを有する第２突出部３４ｂとを備える。
【選択図】図４To provide a vehicle wheel capable of improving mass productivity without increasing manufacturing costs.
A sub air chamber member 18 includes a first sub air chamber portion 18a having a first sub air chamber 40a formed therein, and a second sub air chamber 40b formed therein and a connecting portion 38 through which the first sub air chamber portion 18a is formed. A second auxiliary air chamber portion 18b connected to the first auxiliary air chamber portion 18a along the longitudinal direction; and the first auxiliary air chamber portion 18a adjacent to the connecting portion 38; A first projecting portion 34a having a first communication hole 44a for communicating 40a and the tire air chamber 20, and one end portion along the longitudinal direction of the second auxiliary air chamber portion 18b opposite to the connecting portion 38; And a second protrusion 34b having a second communication hole 44b that communicates the second auxiliary air chamber 40b and the tire air chamber 20 with each other.
[Selection] Figure 4

Description

本発明は、タイヤ空気室内の気柱共鳴（空洞共鳴）に伴う騒音を低減する車両用ホイールに関する。 The present invention relates to a vehicle wheel that reduces noise associated with air column resonance (cavity resonance) in a tire air chamber.

一般に、タイヤの空気室（以下、「タイヤ空気室」という。）内で生じる気柱共鳴が、自動車のロードノイズの要因となることが知られている。この気柱共鳴とは、路面からタイヤに伝わるランダムな振動がタイヤ空気室内の空気を振動させ、その結果、タイヤ空気室の気柱共鳴周波数付近で共鳴現象が起こり、共鳴音が発生する現象をいう。 In general, it is known that air column resonance generated in a tire air chamber (hereinafter referred to as “tire air chamber”) causes road noise of an automobile. The air column resonance is a phenomenon in which random vibration transmitted from the road surface to the tire vibrates the air in the tire air chamber, and as a result, a resonance phenomenon occurs near the air column resonance frequency of the tire air chamber and a resonance sound is generated. Say.

例えば、特許文献１には、この気柱共鳴に伴う騒音を低減するための車両用ホイールが開示されている。この車両用ホイールは、リムの周方向に沿って複数の副気室を有している。さらに詳細に説明すると、この車両用ホイールでは、リムの周方向に延びるようにウェル部に立設された環状の縦壁と、ビードシート部側に向かうウェル部の立上り側壁との間に形成される環状の空間部分が蓋部材で閉塞されている。そして、前記蓋部材とウェル部と縦壁とで区画される空間部分が周方向に所定の間隔をあけて配置された複数の隔壁で仕切られることで各副気室が形成されている。また、タイヤ空気室と各副気室とは、前記蓋部材に形成された連通孔で連通している。この車両用ホイールによれば、連通孔と副気室とがヘルムホルツ・レゾネータを構成し、タイヤ空気室内の気柱共鳴音を低減することができるとしている。 For example, Patent Document 1 discloses a vehicle wheel for reducing noise associated with the air column resonance. The vehicle wheel has a plurality of auxiliary air chambers along the circumferential direction of the rim. More specifically, this vehicle wheel is formed between an annular vertical wall standing on the well portion so as to extend in the circumferential direction of the rim and a rising side wall of the well portion facing the bead seat portion side. The annular space portion is closed with a lid member. Each sub air chamber is formed by partitioning a space portion defined by the lid member, the well portion, and the vertical wall with a plurality of partition walls arranged at predetermined intervals in the circumferential direction. Further, the tire air chamber and each sub air chamber communicate with each other through a communication hole formed in the lid member. According to this vehicle wheel, the communication hole and the auxiliary air chamber constitute a Helmholtz resonator, and air column resonance noise in the tire air chamber can be reduced.

また、特許文献２には、複数の金型を用いて、副気室を周方向に分割する隔壁をウェル部と一体的に鋳造成形する車両ホイールの製造方法が開示されている。
特許第３９９２５６６号公報特開２００８−１２０３０６号公報 Further, Patent Document 2 discloses a method for manufacturing a vehicle wheel in which a partition wall that divides a sub air chamber in a circumferential direction is integrally cast with a well portion using a plurality of molds.
Japanese Patent No. 3992566 JP 2008-120306 A

しかしながら、前記特許文献１に開示された従来技術に係る車両用ホイールは、現実的な構造とはいえない。すなわち、ウェル部から立ち上がるように縦壁を形成したホイールに、複数の隔壁と蓋部材とを、気密性を保持しつつ、溶接、接着、嵌め込み、締結により高精度で結合させる必要があり、気密性の確保、製造工数や製造コストの増大を考慮すると、量産化に不適であるという問題がある。 However, the vehicle wheel according to the prior art disclosed in Patent Document 1 cannot be said to have a realistic structure. That is, it is necessary to join a plurality of partition walls and lid members to a wheel formed with a vertical wall so as to stand up from the well portion with high accuracy by welding, bonding, fitting and fastening while maintaining airtightness. In view of ensuring the performance and increasing the number of manufacturing steps and manufacturing cost, there is a problem that it is not suitable for mass production.

この場合、副気室部材をホイール本体のウェル部に対して簡便に組み付けて量産化を図るためには、予めホイール本体と別体で構成された副気室部材を設けることが考えられるが、前記副気室部材を別体とすることにより、ウェル部に取り付けられた副気室部材が遠心力の作用により周方向に沿って移動すること防止する必要がある。 In this case, in order to easily assemble the auxiliary air chamber member to the well portion of the wheel body for mass production, it may be possible to provide an auxiliary air chamber member that is configured separately from the wheel body in advance. By making the auxiliary air chamber member separate, it is necessary to prevent the auxiliary air chamber member attached to the well portion from moving along the circumferential direction due to the action of centrifugal force.

そこで、予めホイールと別体で構成された副気室部材の周方向に対する周り止めをするために、前記特許文献２に開示された金型を用いてホイールを鋳造成形し、金型に形成された突起部をいわゆる中子として副気室部材の回り止め機能を営む切り欠き部を一体的に形成することが考えられる。 Therefore, in order to prevent the auxiliary air chamber member configured separately from the wheel in the circumferential direction, the wheel is cast using the mold disclosed in Patent Document 2 and formed into the mold. It is conceivable to integrally form a notch portion that functions as a so-called core for preventing the auxiliary air chamber member from rotating.

ところで、前記特許文献２に開示された金型、すなわち、上型及び下型を除いて４分割された側方金型を用いた場合には、各側方金型に形成された突起部によって合計４つの切り欠き部を形成することができるが、例えば、従来から既存の２分割された側方金型を用いた場合、２つの切り欠き部を形成することができるだけであって、残りの２つの切り欠き部を、例えば、旋盤加工等の機械加工によって形成する必要がある。 By the way, in the case of using the mold disclosed in Patent Document 2, that is, the side mold divided into four except for the upper mold and the lower mold, the protrusions formed on the side molds are used. Although a total of four notches can be formed, for example, in the case of using a conventional two-sided side mold, it is only possible to form two notches, and the remaining The two notches need to be formed by machining such as lathe machining.

すなわち、量産化に対処するために、従来から既存の２分割された側方金型を用い、ホイールの鋳造成形と同時に切り欠き部を形成したいという要望があり、従来から既存の２分割された側方金型を用いた場合、２つの切り欠き部が鋳造成形によって一体的に形成されるが、型開きして金型から取り出された鋳造成形品（ホイール成形体）に対し、例えば、旋盤加工等の機械加工によって残り２つの切り欠き部を形成する必要があり、新たな設備投資の追加や切削加工作業の追加によって製造コストが高騰するという他の問題がある。 That is, in order to cope with mass production, there is a demand to form a notch at the same time as casting of a wheel using a conventional two-sided side mold, and the existing two-sided mold has been conventionally used. When a side mold is used, the two notches are integrally formed by casting. For example, a lathe is used for a cast molded product (wheel molded body) that has been opened and taken out from the mold. The remaining two notches need to be formed by machining such as machining, and there is another problem that the manufacturing cost increases due to the addition of new equipment investment and the addition of cutting work.

なお、切り欠き部を４つ形成することは、消音効率との関係から車両用ホイールの周方向に沿って４つの副気室部材を等間隔に配置すると望ましいからである。 In addition, it is because it is desirable to arrange | position four sub air chamber members at equal intervals along the circumferential direction of a vehicle wheel from the relationship with noise reduction efficiency to form four notches.

本発明は、前記の点に鑑みてなされたものであり、製造コストを高騰させることがなく量産性を向上させることが可能な車両用ホイールを提供することを目的とする。 The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle wheel capable of improving mass productivity without increasing manufacturing costs.

前記の目的を達成するために、本発明は、タイヤ空気室内で副気室部材をウェル部の外周面上に固定した車両用ホイールであって、前記副気室部材は、内部に第１副気室が形成された第１副気室部と、内部に第２副気室が形成され、連結部を介して前記第１副気室部と長手方向に沿って連結された第２副気室部と、前記連結部に近接する前記第１副気室部に設けられ、前記第１副気室と前記タイヤ空気室とを連通させる第１連通孔を有する第１突出部と、前記連結部とは反対側の前記第２副気室部の長手方向に沿った一端部に設けられ、前記第２副気室と前記タイヤ空気室とを連通させる第２連通孔を有する第２突出部とを備え、前記第１突出部又は前記第２突出部のいずれか一方は、前記ウェル部の縦壁に形成された切り欠き部によって係止されることを特徴とする。 In order to achieve the above object, the present invention provides a vehicle wheel in which a sub air chamber member is fixed on an outer peripheral surface of a well portion in a tire air chamber, and the sub air chamber member is disposed inside the first sub air chamber member. A first sub-air chamber portion in which an air chamber is formed, and a second sub-air chamber formed therein and connected to the first sub-air chamber portion along the longitudinal direction via a connecting portion. A first projecting portion provided in the first sub air chamber portion adjacent to the connecting portion, the first projecting portion having a first communication hole communicating the first sub air chamber and the tire air chamber; A second protrusion having a second communication hole provided at one end along the longitudinal direction of the second auxiliary air chamber on the side opposite to the portion, and communicating the second auxiliary air chamber with the tire air chamber One of the first protrusion and the second protrusion is engaged by a notch formed in a vertical wall of the well. Is the fact characterized.

本発明によれば、副気室部材の長手方向に沿った一方の第１副気室部及び他方の第２副気室部の内部に第１副気室及び第２副気室をそれぞれ形成し、さらに、連結部に近接する第１副気室部に第１副気室とタイヤ空気室とを連通させる第１連通孔を有する第１突出部を設けると共に、連結部とは反対側の第２副気室部の長手方向に沿った一端部に第２副気室とタイヤ空気室とを連通させる第２連通孔を有する第２突出部を設け、第１突出部又は第２突出部のいずれか一方が、ウェル部の縦壁に形成された切り欠き部によって係止されることにより、副気室部材の回り止め機能を営む切り欠き部がリムの周方向に沿って２個形成されていればよい。このため、従来から既存の２分割された側方金型に十分に対応することができ、前記２分割された側方金型によってホイールの鋳造成形と同時に２個の切り欠き部を形成することができる。 According to the present invention, the first sub air chamber and the second sub air chamber are formed in one of the first sub air chamber and the other second sub air chamber along the longitudinal direction of the sub air chamber member, respectively. In addition, a first protrusion having a first communication hole for communicating the first sub air chamber and the tire air chamber is provided in the first sub air chamber portion adjacent to the connection portion, and on the opposite side of the connection portion. A second protrusion having a second communication hole for communicating the second auxiliary air chamber and the tire air chamber is provided at one end portion along the longitudinal direction of the second auxiliary air chamber, and the first protrusion or the second protrusion Either one of the two is locked by a notch formed in the vertical wall of the well portion, so that two notch portions that serve to prevent the auxiliary air chamber member from rotating are formed along the circumferential direction of the rim. It only has to be done. For this reason, it is possible to sufficiently cope with the existing two-sided side mold, and two notches are formed simultaneously with the wheel casting by the two-sided side mold. Can do.

従って、本発明では、従来から既存の２分割された側方金型が利用可能となり量産性に寄与することができると共に、金型によって成形された鋳造成形体に対して後加工で切り欠き部を加工することが不要となり、新たな設備投資や切削加工作業が不要となって製造コストを低減させることができる。 Therefore, in the present invention, the existing two-sided side mold can be used conventionally, which can contribute to mass productivity, and the notched portion is formed by post-processing on the cast molded body formed by the mold. This eliminates the need for machining, and eliminates the need for new equipment investment and cutting work, thereby reducing the manufacturing cost.

また、本発明によれば、第１副気室を有する第１副気室部と、第２副気室を有する第２副気室部とが連結部を介装して一体的に結合された副気室部材によって構成されているため、従来と比較して１個のホイールに対する副気室部材の組み付け個数が少なくなって（例えば、従来であれば４個であるが、本発明では２個）組付作業を減少させることができると共に、組み付け時間を短縮させて組み付け工程を簡略化することができる。この結果、本発明では、組み付け性を向上させて、生産効率を上昇させることができる。 Further, according to the present invention, the first sub air chamber portion having the first sub air chamber and the second sub air chamber portion having the second sub air chamber are integrally coupled via the connecting portion. Therefore, the number of sub air chamber members assembled to one wheel is smaller than that of the conventional one (for example, four in the conventional case, but 2 in the present invention). The assembly work can be reduced and the assembly process can be simplified by shortening the assembly time. As a result, in the present invention, assembly efficiency can be improved and production efficiency can be increased.

さらに、本発明によれば、第１副気室部に設けられた第１突出部と第２副気室部に設けられた第２突出部とを、リム中心から周方向に沿って略９０度の離間角度を持って配置されることにより、良好な消音効率を得ることができる。 Furthermore, according to the present invention, the first protrusion provided in the first auxiliary air chamber and the second protrusion provided in the second auxiliary air chamber are approximately 90 along the circumferential direction from the rim center. By arranging with a separation angle of a degree, it is possible to obtain a good silencing efficiency.

本発明によれば、製造コストを高騰させることがなく量産性を向上させることが可能な車両用ホイールを得ることができる。 ADVANTAGE OF THE INVENTION According to this invention, the vehicle wheel which can improve mass-productivity, without raising manufacturing cost can be obtained.

次に、本発明の実施形態について、適宜図面を参照しながら詳細に説明する。図１は、本発明の実施形態に係る車両用ホイールの斜視図、図２は、図１の車両用ホイールにタイヤを装着した車輪の要部拡大縦断面図、図３は、ウェル部の外周面に装着された副気室部材の拡大縦断面図である。 Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a perspective view of a vehicle wheel according to an embodiment of the present invention, FIG. 2 is an enlarged longitudinal sectional view of a main part of a wheel in which a tire is mounted on the vehicle wheel of FIG. 1, and FIG. It is an expanded longitudinal cross-sectional view of the sub air chamber member with which the surface was mounted | worn.

先ず、車両用ホイールの全体構成について説明した後に、副気室部材の構成について説明する。図１に示されるように、本発明の実施形態に係る車両用ホイール１０は、タイヤ１２（図２参照）を装着するためのリム１４と、前記リム１４を図示しないハブに連結するためのディスク１６と、弾性変形して前記リム１４の外周面に装着される副気室部材１８とから構成される。 First, after describing the overall configuration of the vehicle wheel, the configuration of the auxiliary air chamber member will be described. As shown in FIG. 1, a vehicle wheel 10 according to an embodiment of the present invention includes a rim 14 for mounting a tire 12 (see FIG. 2), and a disk for connecting the rim 14 to a hub (not shown). 16 and an auxiliary air chamber member 18 which is elastically deformed and is mounted on the outer peripheral surface of the rim 14.

図２に示されるように、前記リム１４は、幅方向の両端部に形成されるビードシート部１４ａと、前記ビードシート部１４ｂから外側に向けて屈曲して形成されるリムフランジ部１４ｂと、前記ビードシート１４ａ、１４ａ間において径方向内側に窪んで形成されるウェル部１４ｃとを有する。 As shown in FIG. 2, the rim 14 includes a bead sheet portion 14a formed at both ends in the width direction, a rim flange portion 14b formed by bending outward from the bead sheet portion 14b, A well portion 14c is formed between the bead sheets 14a and 14a so as to be recessed inward in the radial direction.

前記ビードシート部１４ａには、タイヤ１２のビード部１２ａが装着される。これにより、リム１４とタイヤ１２の内周面の間に環状の密封空間からなるタイヤ空気室２０が形成される。 A bead portion 12a of the tire 12 is attached to the bead seat portion 14a. As a result, a tire air chamber 20 formed of an annular sealed space is formed between the rim 14 and the inner peripheral surface of the tire 12.

前記ウェル部１４ｃは、タイヤ１２をリム１４に組み付ける際、タイヤ１２のビード部１２ａを落とし込むために設けられるものである。このウェル部１４ｃの外周面２１には、縦壁２２が立設されている。 The well portion 14 c is provided to drop the bead portion 12 a of the tire 12 when the tire 12 is assembled to the rim 14. A vertical wall 22 is erected on the outer peripheral surface 21 of the well portion 14c.

縦壁２２は、図３に示されるように、ウェル部１４ｃの外周面２１から径方向外側に立ち上がる第１の縦壁面２４ａを形成するように外周面２１に立設されている。そして、前記縦壁２２は、外周面２１の周方向に延びて環状に形成されている。また、ウェル部１４ｃの幅方向内側に形成される側面部２６には、第１の縦壁面２４ａと対向するように第２の縦壁面２４ｂが設けられる。 As shown in FIG. 3, the vertical wall 22 is erected on the outer peripheral surface 21 so as to form a first vertical wall surface 24 a that rises radially outward from the outer peripheral surface 21 of the well portion 14 c. And the said vertical wall 22 is extended in the circumferential direction of the outer peripheral surface 21, and is formed in cyclic | annular form. A second vertical wall surface 24b is provided on the side surface portion 26 formed on the inner side in the width direction of the well portion 14c so as to face the first vertical wall surface 24a.

そして、これらの第１の縦壁面２４ａ及び第２の縦壁面２４ｂには、それぞれ溝部２８が形成されている。これらの溝部２８は、ウェル部１４ｃの外周面２１の周方向に沿って形成されて環状溝となっている。これらの溝部２８には、後記する副気室部材１８の縁部３０が嵌め込まれる。 A groove 28 is formed in each of the first vertical wall surface 24a and the second vertical wall surface 24b. These groove portions 28 are formed along the circumferential direction of the outer peripheral surface 21 of the well portion 14c to form an annular groove. An edge 30 of the auxiliary air chamber member 18 to be described later is fitted into these grooves 28.

また、前記縦壁２２には、図３に示されるように、切り欠き部３２が形成されている。この切り欠き部３２は、後記する副気室部材１８の第１突出部３４ａ（管部材）が嵌め込まれて、前記第１突出部３４ａを係止することにより、副気室部材１８の周方向に対する回り止め機能を営むものである。前記切り欠き部３２は、ホイール全体において、図７に示されるように、周方向に沿って１８０度離間した２箇所に設けられる。なお、本実施形態における切り欠き部３２は、図示しない金型装置によってホイールを鋳造成形する際、各側方金型に形成された突起部によって縦壁２２と同時に形成されることが好ましい。 Further, as shown in FIG. 3, a cutout portion 32 is formed in the vertical wall 22. The notch 32 has a circumferential direction of the auxiliary air chamber member 18 by fitting a first protrusion 34a (tube member) of the auxiliary air chamber member 18 to be described later and locking the first protrusion 34a. It has a detent function against As shown in FIG. 7, the cutout portions 32 are provided at two locations spaced 180 degrees along the circumferential direction in the entire wheel. Note that the notch 32 in the present embodiment is preferably formed simultaneously with the vertical wall 22 by a protrusion formed on each side mold when a wheel is cast by a mold apparatus (not shown).

ディスク１６は、図２に示されるように、リム１４の車両外側の端部から径方向内側に連続して形成される。リム１４及びディスク１６は、例えば、アルミニウム合金、マグネシウム合金等の軽量高強度材料等から製造される。なお、これらの材料に限定されるものではなく、スチール（鋼）等から形成されるものであってもよい。また、車両用ホイール１０は、スポークホイールであってもよい。 As shown in FIG. 2, the disk 16 is continuously formed radially inward from the end of the rim 14 on the vehicle outer side. The rim 14 and the disk 16 are manufactured from, for example, a lightweight high-strength material such as an aluminum alloy or a magnesium alloy. In addition, it is not limited to these materials, You may form from steel (steel) etc. The vehicle wheel 10 may be a spoke wheel.

次に、副気室部材１８について説明する。図４は、車両用ホイールの径方向に沿った縦断面図、図５（ａ）は、副気室部材の平面図、図５（ｂ）は、前記副気室部材の斜視図、図６（ａ）は、縦壁の切り欠き部に係止される副気室部材の突出部を示す部分斜視図、図６（ｂ）は、図５（ａ）のＶＩ−ＶＩ線に沿った副気室部材の縦断面図である。 Next, the auxiliary air chamber member 18 will be described. 4 is a longitudinal sectional view along the radial direction of the vehicle wheel, FIG. 5A is a plan view of the auxiliary air chamber member, FIG. 5B is a perspective view of the auxiliary air chamber member, FIG. FIG. 6A is a partial perspective view showing a protruding portion of the auxiliary air chamber member that is locked to the notch portion of the vertical wall, and FIG. 6B is an auxiliary view taken along line VI-VI in FIG. It is a longitudinal cross-sectional view of an air chamber member.

副気室部材１８は、図４及び図５に示されるように、ウェル部１４ｃの周方向に沿って配置される一方向に沿って長尺に形成された部材であって、長手方向に沿って一体的に連結された第１副気室部１８ａ及び第２副気室部１８ｂと、前記第１副気室部１８ａと前記第２副気室部１８ｂとの間に設けられ、矩形状に切り欠かれた一対の凹部３６によって幅狭に形成された連結部３８とを備える。 As shown in FIGS. 4 and 5, the auxiliary air chamber member 18 is a member formed in an elongated shape along one direction arranged along the circumferential direction of the well portion 14 c, and extends along the longitudinal direction. The first sub air chamber portion 18a and the second sub air chamber portion 18b, which are integrally connected to each other, are provided between the first sub air chamber portion 18a and the second sub air chamber portion 18b. And a connecting portion 38 formed narrowly by a pair of recesses 36 cut out.

副気室部材１８は、図４に示されるように、ウェル部１４ｃの周面に沿って等間隔に２つ配置されている。すなわち、本実施形態に係る車両用ホイール１０は、リム１４の中心Ｏ（以下、リム中心Ｏという）を挟んで対向する１対の副気室部材１８を備えている。 As shown in FIG. 4, two auxiliary air chamber members 18 are arranged at equal intervals along the peripheral surface of the well portion 14c. That is, the vehicle wheel 10 according to the present embodiment includes a pair of auxiliary air chamber members 18 that face each other with a center O of the rim 14 (hereinafter referred to as a rim center O) interposed therebetween.

副気室部材１８の長手方向に沿った一方の第１副気室部１８ａ及び他方の第２副気室部１８ｂの内部には、第１副気室４０ａ及び第２副気室４０ｂがそれぞれ形成される。この第１副気室４０ａ及び第２副気室４０ｂは、図４に示されるように、副気室部材１８の長手方向（ホイールの径方向）に沿った縦断面において、ウェル部１４ｃの周方向に沿って長尺で且つ薄く湾曲した略矩形状に形成され、また、図６（ｂ）に示されるように、副気室部材１８の長手方向と直交する縦断面において、前記副気室部材１８の長手方向と直交する幅方向に沿って徐々に薄い略矩形状に形成されている。 Inside the one first sub air chamber portion 18a and the other second sub air chamber portion 18b along the longitudinal direction of the sub air chamber member 18, a first sub air chamber 40a and a second sub air chamber 40b are respectively provided. It is formed. As shown in FIG. 4, the first auxiliary air chamber 40a and the second auxiliary air chamber 40b are arranged in a longitudinal section along the longitudinal direction of the auxiliary air chamber member 18 (the radial direction of the wheel). The sub air chamber is formed in a substantially rectangular shape that is long and thinly curved along the direction, and is perpendicular to the longitudinal direction of the sub air chamber member 18, as shown in FIG. 6B. The member 18 is gradually formed in a substantially rectangular shape along a width direction orthogonal to the longitudinal direction of the member 18.

第１副気室部１８ａ及び第２副気室部１８ｂは、図３に示されるように、ウェル部１４ｃ（リム１４）の外周面に沿うように延在し、且つ長手方向に沿って湾曲するように形成されている。第１副気室部１８ａ及び第２副気室部１８ｂは、それぞれ、内部に第１副気室４０ａ及び第２副気室４０ｂが形成された本体部４２と、前記本体部４２からその周囲に延出する板状の縁部３０とを備えている。この縁部３０の肉厚は、本体部４２の肉厚と同一又は略同一の厚さを有する。なお、本実施形態での縁部３０は、前記肉厚や後記する材料を適宜に決定することで、ばね性を有している。 As shown in FIG. 3, the first auxiliary air chamber portion 18a and the second auxiliary air chamber portion 18b extend along the outer peripheral surface of the well portion 14c (rim 14), and are curved along the longitudinal direction. It is formed to do. The first sub air chamber portion 18a and the second sub air chamber portion 18b are respectively composed of a main body portion 42 in which a first sub air chamber 40a and a second sub air chamber 40b are formed, and surroundings from the main body portion 42. And a plate-like edge portion 30 extending in the direction. The thickness of the edge portion 30 is the same as or substantially the same as the thickness of the main body portion 42. In addition, the edge part 30 in this embodiment has spring property by determining the said thickness and the material mentioned later suitably.

図３に示されるように、第１副気室部１８ａ及び第２副気室部１８ｂは、第１の縦壁面２４ａと第２の縦壁面２４ｂとの間に嵌り込んでウェル部１４ｃの外周面２１上に固定されている。さらに詳細に説明すると、縁部３０は、第１の縦壁面２４ａ側と第２の縦壁面２４ｂ側に延出して各溝部２８に嵌り込むと共に、本体部４２からウェル部１４ｃの外周面２１に沿うように周方向に延出している。ちなみに、第１副気室部１８ａ及び第２副気室部１８ｂは、本体部４２から第１の縦壁面２４ａ側と第２の縦壁面２４ｂ側にそれぞれ延出する縁部３０の両端縁３０ａが各溝部２８に嵌り込むことで第１の縦壁面２４ａと第２の縦壁面２４ｂに係止されている。 As shown in FIG. 3, the first sub-air chamber portion 18a and the second sub-air chamber portion 18b are fitted between the first vertical wall surface 24a and the second vertical wall surface 24b, and the outer periphery of the well portion 14c. It is fixed on the surface 21. More specifically, the edge portion 30 extends to the first vertical wall surface 24a side and the second vertical wall surface 24b side and fits into each groove portion 28, and from the main body portion 42 to the outer peripheral surface 21 of the well portion 14c. It extends in the circumferential direction along. Incidentally, the first sub air chamber portion 18a and the second sub air chamber portion 18b have both end edges 30a of the edge portion 30 extending from the main body portion 42 to the first vertical wall surface 24a side and the second vertical wall surface 24b side, respectively. Is engaged with each of the groove portions 28 to be locked to the first vertical wall surface 24a and the second vertical wall surface 24b.

図３に示されるように、第１副気室部１８ａ及び第２副気室部１８ｂは、両端縁３０ａの間でウェル部１４ｃの外周面２１側に凸となるように湾曲している。つまり、本体部４２の外周面２１側を構成する底板と、この底板から延出する縁部３０とは一体的に形成される。ちなみに、第１副気室部１８ａ及び第２副気室部１８ｂは、ホイールの回転による遠心力が作用した際、湾曲部が逆に凸となる方向に反転しようとして第１の縦壁面２４ａと第２の縦壁面２４ｂとに対する両端縁３０ａの押圧力を増大させるように設けられている。 As shown in FIG. 3, the first sub air chamber portion 18a and the second sub air chamber portion 18b are curved so as to protrude toward the outer peripheral surface 21 side of the well portion 14c between both end edges 30a. That is, the bottom plate constituting the outer peripheral surface 21 side of the main body portion 42 and the edge portion 30 extending from the bottom plate are integrally formed. Incidentally, the first auxiliary air chamber portion 18a and the second auxiliary air chamber portion 18b are arranged so as to be reversed with the first vertical wall surface 24a in an attempt to reverse the curved portion in a convex direction when the centrifugal force due to the rotation of the wheel acts. It is provided so as to increase the pressing force of both end edges 30a against the second vertical wall surface 24b.

また、第１副気室部１８ａの一側部には、図５に示されるように、ホイール（ホイール本体）の回転方向と交差する方向（本実施形態では直交する方向）に本体部４２から所定長だけ突出する第１突出部３４ａを有する。前記第１突出部３４ａは、連結部３８に近接する第１副気室部１８ａの長手方向に沿った端部側に設けられる。 Further, as shown in FIG. 5, the one side portion of the first auxiliary air chamber portion 18 a has a main body 42 in a direction intersecting with the rotation direction of the wheel (wheel main body) (a direction orthogonal to the present embodiment). It has the 1st protrusion part 34a which protrudes only predetermined length. The first projecting portion 34 a is provided on the end side along the longitudinal direction of the first auxiliary air chamber portion 18 a close to the connecting portion 38.

この第１突出部３４ａは、図６（ａ）に示されるように、縦壁２２側に延びて、縦壁２２に形成された切り欠き部３２に嵌り込んで係止されることにより、副気室部材１８がウェル部１４ｃの周方向に沿って変位することを防止する回り止め機能を有する。前記第１突出部３４ａは、断面楕円形状からなる管部材で形成されており、この管部材の内側には、図６（ｂ）に示されるように、第１副気室部１８ａ内の第１副気室４０ａとタイヤ空気室２０とを連通させる第１連通孔４４ａが形成されている。 As shown in FIG. 6A, the first protrusion 34 a extends to the vertical wall 22 side, and is fitted into a notch 32 formed in the vertical wall 22 to be locked. The air chamber member 18 has a rotation preventing function that prevents the air chamber member 18 from being displaced along the circumferential direction of the well portion 14c. The first projecting portion 34a is formed of a tube member having an elliptical cross section, and inside the tube member, as shown in FIG. 6 (b), the first sub air chamber portion 18a has a first inner portion. A first communication hole 44a that allows the first auxiliary air chamber 40a and the tire air chamber 20 to communicate with each other is formed.

さらに、第２副気室部１８ｂの長手方向に沿った一端部には、図５に示されるように、ウェル部１４ｃ（リム１４）の周方向に沿って本体部４２から所定長だけ突出する第２突出部３４ｂが設けられる。前記第２突出部３４ｂは、連結部３８とは反対側の第２副気室部１８ｂの一端部に設けられ、第２副気室部１８ｂの本体部４２の長手方向に沿って所定長だけ延在するように設けられる。 Further, as shown in FIG. 5, one end portion along the longitudinal direction of the second auxiliary air chamber portion 18b protrudes from the main body portion 42 by a predetermined length along the circumferential direction of the well portion 14c (rim 14). A second protrusion 34b is provided. The second projecting portion 34b is provided at one end of the second auxiliary air chamber portion 18b opposite to the connecting portion 38, and has a predetermined length along the longitudinal direction of the main body portion 42 of the second auxiliary air chamber portion 18b. It is provided to extend.

この第２突出部３４ｂは、図５（ｂ）に示されるように、断面楕円形状からなる管部材で形成されており、この管部材の内側には、第２副気室部１８ｂ内の第２副気室４０ｂとタイヤ空気室２０とを連通させる第２連通孔４４ｂが形成されている。なお、第２突出部３４ｂは、第１突出部３４ａと異なり、縦壁２２に形成された切り欠き部３２によって係止されていない。 As shown in FIG. 5 (b), the second projecting portion 34b is formed of a tube member having an elliptical cross section. Inside the tube member, the second projecting portion 34b has a second sub-air chamber portion 18b. A second communication hole 44b that allows the second auxiliary air chamber 40b and the tire air chamber 20 to communicate with each other is formed. In addition, the 2nd protrusion part 34b is not latched by the notch part 32 formed in the vertical wall 22 unlike the 1st protrusion part 34a.

なお、第１副気室部１８ａの第１突出部３４ａと第２副気室部１８ｂの第２突出部３４ｂは、図４に示されるように、リム中心Ｏから周方向に沿って略９０度の中心角度θ（離隔角度θ）を持って配置されることにより、良好な消音効率を得ることができる。 In addition, the 1st protrusion part 34a of the 1st subair chamber part 18a and the 2nd protrusion part 34b of the 2nd subair chamber part 18b are substantially 90 along the circumferential direction from the rim center O, as FIG. 4 shows. By arranging with a central angle θ of the degree (separation angle θ), it is possible to obtain a good silencing efficiency.

前記第１副気室部１８ａ及び第２副気室部１８ｂに形成される第１副気室４０ａ及び第２副気室４０ｂの形状は、特に限定されるものではないが、断面視して扁平形状が好ましい。また、各副気室４０ａ（４０ｂ）の容積は、例えば、５０〜２５０ｃｃ程度が好ましい。各副気室４０ａ（４０ｂ）の容積をこの範囲内に設定することで、副気室部材１８は、消音効果を充分に発揮しつつ、その重量の増大を抑制して車両用ホイール１０の軽量化を達成することができる。また、周方向に沿った副気室部材１８の長さは、リム１４の周長と同じ長さを最大とし、車両用ホイール１０の重量の調整やウェル部１４ｃに対する組み付け性を考慮して適宜に設定される。 The shapes of the first sub air chamber 40a and the second sub air chamber 40b formed in the first sub air chamber portion 18a and the second sub air chamber portion 18b are not particularly limited. A flat shape is preferred. The volume of each auxiliary air chamber 40a (40b) is preferably about 50 to 250 cc, for example. By setting the volume of each auxiliary air chamber 40a (40b) within this range, the auxiliary air chamber member 18 exhibits a silencing effect and suppresses an increase in its weight, thereby reducing the weight of the vehicle wheel 10. Can be achieved. Further, the length of the auxiliary air chamber member 18 along the circumferential direction is set to the same length as the circumferential length of the rim 14, and is appropriately determined in consideration of the adjustment of the weight of the vehicle wheel 10 and the assembling property with respect to the well portion 14c. Set to

第１連通孔４４ａ及び第２連通孔４４ｂの断面形状は、特に限定されるものではなく、例えば、円形、楕円形、多角形、トンネル形状等のいずれであってもよい。第１連通孔４４ａ及び第２連通孔４４ｂの直径は、断面が円形の場合には、５ｍｍ以上が好ましい。また、円形以外の断面形状の連通孔４４ａ、４４ｂは、その断面積で同じ断面積の円形に換算して直径５ｍｍ以上のものが好ましい。 The cross-sectional shapes of the first communication hole 44a and the second communication hole 44b are not particularly limited, and may be any of, for example, a circle, an ellipse, a polygon, and a tunnel shape. The diameters of the first communication hole 44a and the second communication hole 44b are preferably 5 mm or more when the cross section is circular. The communication holes 44a and 44b having a cross-sectional shape other than a circle preferably have a diameter of 5 mm or more in terms of a cross-sectional area converted to a circle having the same cross-sectional area.

第１連通孔４４ａ及び第２連通孔４４ｂの長さは、次の（式１）で示されるヘルムホルツ・レゾネータの共鳴周波数を求める式を充足するようにそれぞれ設定されるとよい。 The lengths of the first communication hole 44a and the second communication hole 44b may be set so as to satisfy the formula for obtaining the resonance frequency of the Helmholtz resonator shown by the following (Formula 1).

ｆ_０＝Ｃ／２π×√（Ｓ／Ｖ（Ｌ＋α×√Ｓ））・・・（式１）
但し、
ｆ_０（Ｈｚ）：共鳴周波数
Ｃ（ｍ／ｓ）：副気室内部の音速（＝タイヤ空気室内部の音速）
Ｖ（ｍ^３）：副気室の容積
Ｌ（ｍ）：連通孔の長さ
Ｓ（ｍ^２）：連通孔の開口部断面積
α：補正係数
とする。 f ₀ = C / 2π × √ (S / V (L + α × √S)) (Expression 1)
However,
f ₀ (Hz): Resonance frequency C (m / s): Sound velocity in the auxiliary air chamber (= Sound velocity in the tire air chamber)
V (m ³ ): Volume of the auxiliary air chamber L (m): Length of the communication hole S (m ² ): Cross-sectional area of the opening of the communication hole α: Correction coefficient

なお、前記共鳴周波数ｆ_０（Ｈｚ）は、タイヤ空気室２０の共鳴周波数に合わせられる。その際、一対から構成される副気室部材１８の共鳴周波数は、両方とも同一に設定してもよいし、又はそれぞれ異なるように設定してもよい。具体的には、タイヤ空気室２０の共鳴周波数に２つの共鳴周波数（ｆ_１、ｆ_２）が認められる場合に、一対の副気室部材１８の共鳴周波数ｆ_０を（ｆ_１＋ｆ_２）／２にそれぞれ設定することができる。また、リム中心Ｏを挟んで対向する一方の副気室部材１８の共鳴周波数ｆ_０をｆ_１に設定し、他方の副気室部材１８の共鳴周波数ｆ_０をｆ_２に設定することもできる。 The resonance frequency f ₀ (Hz) is adjusted to the resonance frequency of the tire air chamber 20. At this time, the resonance frequencies of the pair of sub air chamber members 18 may be set to be the same or different from each other. Specifically, when two resonance frequencies (f ₁ , f ₂ ) are recognized as the resonance frequencies of the tire air chamber 20, the resonance frequency f ₀ of the pair of auxiliary air chamber members 18 is set to (f ₁ + f ₂ ) / 2 can be set respectively. It is also possible to set the resonance frequency f ₀ of the one sub air chamber member 18 which face each other across the rim center O to f _1, setting the resonance frequency f ₀ of the other sub air chamber member 18 to f ₂ .

副気室部材１８の材料としては、例えば、金属、合成樹脂やゴム等の工業製品に使用される一般的な材料を使用することができる。また、副気室部材１８の軽量化や量産性の向上、製造コストの削減、各副気室４０ａ、４０ｂの気密性の確保等の諸要素を考慮すると、軽量で高剛性のブロー成形可能な材料が好ましく、中でも、繰り返し曲げ疲労にも強いポリプロピレンが好ましい。 As the material of the auxiliary air chamber member 18, for example, a general material used for industrial products such as metal, synthetic resin, and rubber can be used. Further, considering various factors such as weight reduction of the auxiliary air chamber member 18 and improvement of mass productivity, reduction of manufacturing cost, and securing of airtightness of the auxiliary air chambers 40a and 40b, it is possible to perform light and high rigidity blow molding. Materials are preferred, and among them, polypropylene that is resistant to repeated bending fatigue is preferred.

本実施形態に係る車両用ホイール１０は、基本的に以上のように構成されるものであり、次にその作用効果について説明する。 The vehicle wheel 10 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

本実施形態に係る車両用ホイール１０は、従来の車両用ホイール（例えば、特許文献１参照）のようにリムに複数の隔壁や蓋部材を順次組み付けて気密性を考慮しながら高精度にこれらを結合させて副気室を形成していくものと異なって、予め第１副気室４０ａ及び第２副気室４０ｂを有する副気室部材１８をリム１４の外周面２１に対して弾性を利用して嵌め込むだけで製造される。 The vehicle wheel 10 according to the present embodiment is assembled with a plurality of partition walls and lid members sequentially on the rim as in a conventional vehicle wheel (see, for example, Patent Document 1), with high accuracy while considering airtightness. Unlike the case where the auxiliary air chamber is formed by combining them, the auxiliary air chamber member 18 having the first auxiliary air chamber 40a and the second auxiliary air chamber 40b in advance is utilized with respect to the outer peripheral surface 21 of the rim 14. It is manufactured simply by fitting.

なお、長手方向に沿って長尺に形成された副気室部材１８を溝部２８に対して嵌め込む（挿入する）際、副気室部材１８の中央部から両端部に向かって順次押圧して嵌め込むようにしてもよいし、又は、副気室部材１８の形状に対応する図示しない湾曲した治具を用いて、副気室部材１８を前記治具で全体的に均一に押圧して嵌め込むようにしてもよい。 In addition, when the auxiliary air chamber member 18 that is formed in a longitudinal direction along the longitudinal direction is fitted (inserted) into the groove portion 28, the auxiliary air chamber member 18 is sequentially pressed toward the both ends from the center portion. The auxiliary air chamber member 18 may be inserted into the auxiliary air chamber member 18 evenly by using the curved jig (not shown) corresponding to the shape of the auxiliary air chamber member 18. Also good.

従って、本実施形態に係る車両用ホイール１０は、従来の車両用ホイール（例えば、特許文献１参照）と比較して、製造工数や製造コストを削減することができ、量産性を向上させることができる。また、本実施形態に係る車両用ホイール１０は、従来の車両用ホイールと異なって、第１副気室４０ａ及び第２副気室４０ｂの気密性の確保に対して特別な配慮が不要となるため、消音性能の品質の安定化を達成することができる。 Therefore, the vehicle wheel 10 according to the present embodiment can reduce manufacturing man-hours and manufacturing costs and improve mass productivity as compared with a conventional vehicle wheel (see, for example, Patent Document 1). it can. Further, unlike the conventional vehicle wheel, the vehicle wheel 10 according to the present embodiment does not require special consideration for ensuring the airtightness of the first sub air chamber 40a and the second sub air chamber 40b. Therefore, stabilization of the quality of the silencing performance can be achieved.

また、本実施形態に係る車両用ホイール１０では、副気室部材１８の回り止め機能を営む切り欠き部３２がリム１４の周方向に沿って２個形成されていればよいため（図７参照）、従来から既存の２分割された側方金型に十分に対応することができ、前記２分割された側方金型によってホイールの鋳造成形と同時に２個の切り欠き部３２を形成することができる。 Further, in the vehicle wheel 10 according to the present embodiment, it is only necessary to form two cutout portions 32 that serve to prevent the auxiliary air chamber member 18 from rotating along the circumferential direction of the rim 14 (see FIG. 7). ), Which can sufficiently correspond to the existing two-sided side mold, and the two notched parts 32 are formed simultaneously with the wheel casting by the two-sided side mold. Can do.

従って、本実施形態に係る車両用ホイール１０では、従来から既存の２分割された側方金型が利用可能となり量産性に寄与することができると共に、金型によって成形された鋳造成形体に対して後加工で切り欠き部３２を加工することが不要となり、新たな設備投資や切削加工作業が不要となって製造コストを低減させることができる。 Therefore, in the vehicle wheel 10 according to the present embodiment, the existing two-sided side mold can be used conventionally, which can contribute to mass productivity, and the cast molded body molded by the mold can be used. Therefore, it is not necessary to process the notch 32 by post-processing, and new equipment investment and cutting work are not required, and the manufacturing cost can be reduced.

さらに、本実施形態に係る車両用ホイール１０では、第１副気室４０ａを有する第１副気室部１８ａと、第２副気室４０ｂを有する第２副気室部１８ｂとが連結部３８を介装して一体的に結合された副気室部材１８によって構成されているため、従来と比較して１個のホイールに対する副気室部材１８の組み付け個数が少なくなって（例えば、従来であれば４個であるが、本実施形態では２個）組付作業を減少させることができると共に、組み付け時間を短縮させて組み付け工程を簡略化することができる。この結果、組み付け性を向上させて、生産効率を上昇させることができる。 Furthermore, in the vehicle wheel 10 according to the present embodiment, the first sub air chamber portion 18a having the first sub air chamber 40a and the second sub air chamber portion 18b having the second sub air chamber 40b are connected to each other. Therefore, the number of assembled sub air chamber members 18 with respect to one wheel is reduced as compared with the conventional case (for example, in the related art). If there are four, this is two in the present embodiment) Assembling work can be reduced, and the assembling process can be simplified by shortening the assembling time. As a result, it is possible to improve assembly efficiency and increase production efficiency.

さらにまた、本実施形態に係る車両用ホイール１０は、副気室部材１８をリム１４の外周面２１に弾性を利用して嵌め込む前に、副気室部材１８自体における共鳴周波数の確認及び修正が可能であるため、副気室部材１８における製品の歩留まりを向上させることができる。 Furthermore, the vehicle wheel 10 according to the present embodiment confirms and corrects the resonance frequency in the auxiliary air chamber member 18 itself before the auxiliary air chamber member 18 is fitted into the outer peripheral surface 21 of the rim 14 using elasticity. Therefore, the product yield in the auxiliary air chamber member 18 can be improved.

またさらに、本実施形態に係る車両用ホイール１０は、副気室部材１８をリム１４（ウェル部１４ｃ）に固定する際、端縁３０ａを第１の縦壁面２４ａと第２の縦壁面２４ｂのそれぞれに設けられた溝部２８に嵌め込むことで固定される。その際、端縁３０ｂは、前記したようにばね弾性を有しているため、副気室部材１８は、第１の縦壁面２４ａと第２の縦壁面２４ｂの間に簡便に且つ強固に固定される。 Furthermore, in the vehicle wheel 10 according to the present embodiment, when the auxiliary air chamber member 18 is fixed to the rim 14 (well portion 14c), the edge 30a is formed between the first vertical wall surface 24a and the second vertical wall surface 24b. It is fixed by being fitted in the groove portion 28 provided in each. At this time, since the edge 30b has spring elasticity as described above, the auxiliary air chamber member 18 is simply and firmly fixed between the first vertical wall surface 24a and the second vertical wall surface 24b. Is done.

またさらに、本実施形態に係る車両用ホイール１０は、図６（ａ）に示されるように、ホイールの回転方向と交差する方向に突出した副気室部材１８の第１突出部３４ａが、縦壁２２の切り欠き部３２に嵌め込まれるように設けられているため、ホイールが回転した際の副気室部材１８の回り止めを確実に遂行することができる。この場合、第１突出部３４ａの内部には、第１連通孔４４ａが形成されているため、前記第１突出部３４ａとは別個に第１連通孔４４ａを形成するための部材を設けることが不要となり、車両用ホイール１０の構造を簡素化して更なる軽量化を達成することができる。 Furthermore, in the vehicle wheel 10 according to the present embodiment, as shown in FIG. 6A, the first projecting portion 34a of the auxiliary air chamber member 18 projecting in the direction intersecting the rotation direction of the wheel is vertically Since it is provided so as to be fitted into the notch 32 of the wall 22, it is possible to reliably prevent the auxiliary air chamber member 18 from rotating when the wheel rotates. In this case, since the first communication hole 44a is formed inside the first protrusion 34a, a member for forming the first communication hole 44a may be provided separately from the first protrusion 34a. It becomes unnecessary, and the structure of the vehicle wheel 10 can be simplified to achieve further weight reduction.

なお、副気室部材１８を構成する第１副気室部１８ａ又は第２副気室部１８ｂの本体部４２の上壁（上面）の一部を切り欠いて孔部（図示せず）を形成し、又は前記上壁から上方に向かって所定長だけ突出する図示しない突出部によって連通孔を設けるようにしてもよい。 A part of the upper wall (upper surface) of the main body 42 of the first sub-air chamber portion 18a or the second sub-air chamber portion 18b constituting the sub-air chamber member 18 is cut out to form a hole (not shown). You may make it provide a communicating hole by the projection part which is formed or protrudes only predetermined length upwards from the said upper wall.

次に、副気室部材の変形例を図８に示す。なお、図５（ａ）に示される副気室部材１８と同一の構成要素には同一の参照数字を付すと共に、対応する構成要素には、その参照数字に英小文字を付して、その詳細な説明を省略する。 Next, a modification of the auxiliary air chamber member is shown in FIG. The same constituent elements as those of the auxiliary air chamber member 18 shown in FIG. 5A are given the same reference numerals, and the corresponding constituent elements are given the lowercase letters in the reference numerals, and the details thereof. The detailed explanation is omitted.

図８（ａ）に示されるように、第１変形例に係る副気室部材５０ａは、第１副気室部１８ａの本体部４２から長手方向と直交する方向に直線状に突出し連結部３８の近傍部位に設けられた第１突出部３４ａに代替して、連結部３８に近接する第１副気室部１８ａの本体部４２から突出して略Ｌ字状に屈曲して形成された第１突出部５２が設けられる点で、図５に示される副気室部材１８と相違している。この第１突出部５２は、連結部３８に隣接する矩形状の凹部３６を経由して副気室部材５０ａの長手方向と直交する方向に所定長だけ延在するように設けられる。 As shown in FIG. 8A, the sub air chamber member 50a according to the first modification projects linearly from the main body portion 42 of the first sub air chamber portion 18a in a direction perpendicular to the longitudinal direction, and the connecting portion 38. Instead of the first protruding portion 34a provided in the vicinity of the first portion, the first protruding portion 34a that protrudes from the main body portion 42 of the first auxiliary air chamber portion 18a adjacent to the connecting portion 38 and is bent in a substantially L shape. It differs from the auxiliary air chamber member 18 shown in FIG. 5 in that the protrusion 52 is provided. The first projecting portion 52 is provided so as to extend by a predetermined length in a direction orthogonal to the longitudinal direction of the auxiliary air chamber member 50 a via a rectangular recess 36 adjacent to the connecting portion 38.

図８（ｂ）に示されるように、第２変形例に係る副気室部材５０ｂは、連結部３８を間にして、図５（ａ）に示される第１副気室部１８ａの第１突出部３４ａと第２副気室部１８ｂの第２突出部３４ｂとを左右逆転させ、長手方向に沿って直線状に延在する第１突出部３４ｂ（３４ａ→３４ｂ）を第１副気室部１８ａに配置すると共に、長手方向と略直交する方向に延在する第２突出部３４ａ（３４ｂ→３４ａ）を第２副気室部１８ｂに配置している点で相違している。この場合、第２副気室部１８ｂの一端部に設けられた第２突出部３４ａが縦壁２２の切り欠き部３２に係止されることにより、第２変形例に係る副気室部材５０ｂの周方向に対する回り止め機能が営まれる。 As shown in FIG. 8 (b), the auxiliary air chamber member 50b according to the second modified example has the first portion of the first auxiliary air chamber portion 18a shown in FIG. The protrusion 34a and the second protrusion 34b of the second auxiliary air chamber 18b are reversed left and right, and the first protrusion 34b (34a → 34b) extending linearly along the longitudinal direction is used as the first auxiliary air chamber. The second projecting portion 34a (34b → 34a) extending in the direction substantially orthogonal to the longitudinal direction is arranged in the second sub air chamber portion 18b. In this case, the second protruding portion 34a provided at one end of the second auxiliary air chamber portion 18b is engaged with the cutout portion 32 of the vertical wall 22, whereby the auxiliary air chamber member 50b according to the second modification example. Anti-rotation function for the circumferential direction of

図８（ｃ）に示されるように、第３変形例に係る副気室部材５０ｃは、連結部３８を間にして、図８（ａ）に示される第１変形例に係る副気室部材５０ａの第１副気室部１８ａの第１突出部５２と第２副気室部１８ｂの第２突出部３４ｂとを左右逆転させ、長手方向に沿って直線状に延在する第１突出部３４ｂを第１副気室部１８ａに配置すると共に、略Ｌ字状に屈曲する第２突出部５２を第２副気室部１８ｂに配置している点で相違している。この場合、第２副気室部１８ｂの一端部に設けられ略Ｌ字状に屈曲する第２突出部５２の先端部が縦壁２２の切り欠き部３２に係止されることにより、第３変形例に係る副気室部材５０ｃの周方向に対する回り止め機能が営まれる。 As shown in FIG. 8 (c), the auxiliary air chamber member 50c according to the third modified example has the connecting portion 38 in between, and the auxiliary air chamber member according to the first modified example shown in FIG. 8 (a). The first protrusion 52 that extends in a straight line along the longitudinal direction by reversing the first protrusion 52 of the first auxiliary air chamber 18a of 50a and the second protrusion 34b of the second auxiliary air chamber 18b left and right. 34b is disposed in the first auxiliary air chamber portion 18a, and the second protrusion 52 that is bent in a substantially L shape is disposed in the second auxiliary air chamber portion 18b. In this case, the tip end portion of the second projecting portion 52 provided at one end portion of the second auxiliary air chamber portion 18b and bent in a substantially L-shape is engaged with the notch portion 32 of the vertical wall 22, whereby the third A function of preventing rotation of the auxiliary air chamber member 50c according to the modification in the circumferential direction is performed.

このように、図５に示される本実施形態及び図８（ａ）〜（ｃ）に示される第１〜第３変形例に係る副気室部材１８、５０ａ〜５０ｃでは、第１突出部３４ａ又は第２突出部３４ｂのいずれか一方がリム１４の縦壁２２に形成された切り欠き部３２によって係止されることにより、副気室部材１８、５０ａ〜５０ｃの周方向に対する回り止め作用を好適に発揮させることができる。 As described above, in the auxiliary air chamber members 18 and 50a to 50c according to the present embodiment shown in FIG. 5 and the first to third modifications shown in FIGS. 8A to 8C, the first protruding portion 34a. Or any one of the 2nd protrusion part 34b is locked by the notch part 32 formed in the vertical wall 22 of the rim | limb 14, and the rotation prevention action with respect to the circumferential direction of the sub air chamber members 18 and 50a-50c is carried out. It can be suitably exhibited.

本発明の実施形態に係る車両用ホイールの斜視図である。1 is a perspective view of a vehicle wheel according to an embodiment of the present invention. 図１の車両用ホイールにタイヤを装着した車輪の要部拡大縦断面図である。FIG. 2 is an enlarged longitudinal sectional view of a main part of a wheel in which a tire is mounted on the vehicle wheel in FIG. 1. ウェル部の外周面に装着された副気室部材の拡大縦断面図である。It is an enlarged vertical sectional view of the auxiliary air chamber member mounted on the outer peripheral surface of the well portion. 車両用ホイールの径方向に沿った縦断面図である。It is a longitudinal cross-sectional view along the radial direction of the vehicle wheel. （ａ）は、副気室部材の平面図、（ｂ）は、前記副気室部材の斜視図である。(A) is a top view of a sub air chamber member, (b) is a perspective view of the said sub air chamber member. （ａ）は、縦壁の切り欠き部に係止される副気室部材の突出部を示す部分斜視図、（ｂ）は、図５（ａ）のＶＩ−ＶＩ線に沿った副気室部材の縦断面図である。(A) is a fragmentary perspective view which shows the protrusion part of the sub air chamber member latched by the notch part of a vertical wall, (b) is a sub air chamber along the VI-VI line of Fig.5 (a). It is a longitudinal cross-sectional view of a member. 図２のＶＩＩ−ＶＩＩ線に沿ったホイール全周にわたる縦壁の縦断面図である。It is a longitudinal cross-sectional view of the vertical wall over the wheel perimeter along the VII-VII line of FIG. （ａ）は、前記副気室部材の第１変形例を示す平面図、（ｂ）は、前記副気室部材の第２変形例を示す平面図、（ｃ）は、前記副気室部材の第３変形例を示す平面図である。(A) is a top view which shows the 1st modification of the said sub air chamber member, (b) is a top view which shows the 2nd modification of the said sub air chamber member, (c) is the said sub air chamber member. It is a top view which shows the 3rd modification of this.

Explanation of symbols

１０車両用ホイール
１４リム
１８、５０ａ〜５０ｃ副気室部材
１８ａ、１８ｂ副気室部
２０タイヤ空気室
２２縦壁
３２切り欠き部
３４ａ、３４ｂ、５２突出部
３８連結部
４０ａ、４０ｂ副気室
４４ａ、４４ｂ連通孔 DESCRIPTION OF SYMBOLS 10 Vehicle wheel 14 Rim 18, 50a-50c Secondary air chamber member 18a, 18b Secondary air chamber part 20 Tire air chamber 22 Vertical wall 32 Notch part 34a, 34b, 52 Protrusion part 38 Connection part 40a, 40b Secondary air chamber 44a 44b Communication hole

Claims

A vehicle wheel in which the auxiliary air chamber member is fixed on the outer peripheral surface of the well portion in the tire air chamber,
The auxiliary air chamber member is
A first sub-air chamber portion having a first sub-air chamber formed therein;
A second sub-air chamber formed inside, and connected to the first sub-air chamber through the connecting portion along the longitudinal direction;
A first protrusion having a first communication hole provided in the first sub-air chamber portion adjacent to the connecting portion and communicating the first sub-air chamber and the tire air chamber;
A second communicating hole that is provided at one end of the second sub air chamber on the opposite side of the connecting portion along the longitudinal direction and communicates the second sub air chamber and the tire air chamber; A protrusion,
With
One of the first projecting portion and the second projecting portion is locked by a notch formed in a vertical wall of the well portion.

The vehicle wheel according to claim 1,
The vehicle wheel, wherein the first protrusion and the second protrusion have a separation angle of approximately 90 degrees along the circumferential direction from the center of the rim.