JP4745026B2 - Pneumatic tire - Google Patents

Pneumatic tire Download PDF

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JP4745026B2
JP4745026B2 JP2005324815A JP2005324815A JP4745026B2 JP 4745026 B2 JP4745026 B2 JP 4745026B2 JP 2005324815 A JP2005324815 A JP 2005324815A JP 2005324815 A JP2005324815 A JP 2005324815A JP 4745026 B2 JP4745026 B2 JP 4745026B2
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tire
height
rim
pneumatic tire
rim flange
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JP2007131097A (en
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弘行 松本
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Toyo Tire Corp
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Toyo Tire and Rubber Co Ltd
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Description

本発明は、リムフランジを保護するべく、リムフランジと対向するタイヤ内径側斜面を備えた***状突起（リムプロテクター）をタイヤ周方向に延設した空気入りタイヤに関する。   The present invention relates to a pneumatic tire in which raised protrusions (rim protectors) having a tire inner diameter side slope facing the rim flange are extended in the tire circumferential direction in order to protect the rim flange.

偏平タイヤのようにタイヤ断面高さが低い空気入りタイヤでは、縁石や路面の穴によって装着したリムのフランジを損傷し易い。そこで、従来より、ビードベースからタイヤ外径側に２２mm付近の位置から、タイヤ最大幅点の範囲にあるサイドウォール部に、タイヤ周方向に沿って延びる環状の***状突起を設けて、リムフランジを保護していた。   In a pneumatic tire having a low tire cross-section height such as a flat tire, the flange of the rim mounted by a curb or a hole in the road surface is easily damaged. Therefore, conventionally, an annular ridge-shaped protrusion extending along the tire circumferential direction is provided on the sidewall portion in the range of the tire maximum width point from a position near 22 mm on the tire outer diameter side from the bead base, and the rim flange is provided. Was protecting.

しかし、リムフランジの保護を優先し、リムプロテクター形状を大きくし過ぎると、ビード周りの剛性が高くなり過ぎて、リム組みの際の作業性の悪化を引き起し易い。また、タイヤの偏平化が進むに従って、サイドデザインの模様のスペースが少なくなるため、デザイン性をアピールするのが難しくなるという、新たな課題も発生している。   However, if the protection of the rim flange is prioritized and the rim protector shape is too large, the rigidity around the bead becomes too high and the workability at the time of assembling the rim tends to deteriorate. Moreover, as the flattening of tires progresses, there is a new problem that it becomes difficult to appeal the design because the space for the side design pattern is reduced.

一方、リムプロテクターの断面形状を周方向に変化させた空気入りタイヤとしては、例えば、下記の特許文献１に開示されているように、リムプロテクターの周上に、周方向に不連続の凹部を多数設けたものが知られている。しかし、リムプロテクターの周上に凹部を設けたものであるため、リムフランジの保護性能を向上させることはできない。また、リムプロテクターが不連続な形状を有する場合、縁石等に接触した際に、不連続な部分に応力が集中して、その部分からゴムの破断が生じ易いという問題もある。   On the other hand, as a pneumatic tire in which the cross-sectional shape of the rim protector is changed in the circumferential direction, for example, as disclosed in Patent Document 1 below, discontinuous recesses in the circumferential direction are provided on the circumference of the rim protector. Many are known. However, since the recess is provided on the circumference of the rim protector, the protection performance of the rim flange cannot be improved. Further, when the rim protector has a discontinuous shape, there is a problem that when the rim protector comes into contact with a curb stone or the like, stress concentrates on the discontinuous portion, and rubber breaks easily from that portion.

また、下記の特許文献２に開示されているように、リムプロテクターのタイヤ径方向外側の辺に多数のリッジ（細長い***部）を設けた空気入りタイヤが知られている。しかし、リムプロテクター自体の高さは従来と略同等であるため、リムフランジの保護性能をほとんど向上させることはできない。   Also, as disclosed in Patent Document 2 below, a pneumatic tire is known in which a large number of ridges (elongated ridges) are provided on the outer side in the tire radial direction of the rim protector. However, since the height of the rim protector itself is substantially the same as the conventional height, the protection performance of the rim flange can hardly be improved.

特開平８−２５８５１８号公報JP-A-8-258518 特開平８−２８２２１８号公報JP-A-8-282218

そこで、本発明の目的は、リムフランジの保護性能を向上させることができ、ゴムの破断が生じにくく、しかもリム組みの際の作業性も十分良好な空気入りタイヤを提供することにある。   Therefore, an object of the present invention is to provide a pneumatic tire that can improve the protection performance of the rim flange, is less likely to break the rubber, and has sufficiently good workability when assembling the rim.

上記目的は、下記の如き本発明により達成できる。
即ち、本発明の空気入りタイヤは、リムフランジを保護するべく、リムフランジと対向するタイヤ内径側斜面を備えた***状突起をタイヤ周方向に設けた空気入りタイヤにおいて、前記***状突起の頂部がタイヤ全周に連続すると共に、その頂部の高さがタイヤ周方向に沿って大小交互に変化しており、高さ変化の１周期における前記頂部の高さが最も高い部分はタイヤ半径方向の最も内径側に配され、前記頂部の高さが最も低い部分はタイヤ半径方向の最も外径側に配されていることを特徴とする。 The above object can be achieved by the present invention as described below.
That is, the pneumatic tire according to the present invention is a pneumatic tire in which a raised protrusion having a tire inner diameter side slope facing the rim flange is provided in the tire circumferential direction so as to protect the rim flange. Is continuous along the entire circumference of the tire, and the height of the top thereof changes alternately in the tire circumferential direction, and the highest height of the top in one cycle of the height change is in the tire radial direction. The portion arranged on the innermost diameter side and having the lowest top portion is arranged on the outermost diameter side in the tire radial direction .

本発明の空気入りタイヤによると、前記***状突起の頂部が全周に連続するため、縁石等に接触した際に、不連続な部分に応力が集中せずに、ゴムの破断が生じにくくなる。また、頂部の高さがタイヤ周方向に沿って大小交互に変化するため、***状突起が従来と同じ体積であっても、従来より頂部の高さを部分的に高くすることができるため、リムフランジの保護性能を向上させることができる。更に、頂部の高さが従来より高い部分と低い部分とが存在するため、ビード周りの剛性が高くなり過ぎて、リム組みの際の作業性の悪化を引き起すこともない。   According to the pneumatic tire of the present invention, since the tops of the raised protrusions are continuous over the entire circumference, when contacting a curbstone or the like, the stress is not concentrated on the discontinuous portion, and the rubber is less likely to break. . In addition, since the height of the top portion changes alternately along the tire circumferential direction, even if the raised protrusions have the same volume as the conventional, the height of the top portion can be partially increased than before, The protection performance of the rim flange can be improved. Furthermore, since there are a portion where the height of the top portion is higher than that of the conventional portion and a portion where the top portion is lower, the rigidity around the bead becomes too high, and the workability at the time of assembling the rim does not deteriorate.

本発明では、高さ変化の１周期における前記頂部の高さが最も高い部分はタイヤ半径方向の最も内径側に配され、前記頂部の高さが最も低い部分はタイヤ半径方向の最も外径側に配されているので、頂部の最も低い部分が最もタイヤ幅方向外側に配されることになるため、頂部が同じ高さを有する場合でも、相対的にタイヤ幅方向外側に突出し易くなるので、リムフランジの保護性能をより向上させることができる。なお、***状突起の頂部の位置が周方向に沿って変化するため、意匠性にも優れたものとなり易い。 In the present invention, the portion with the highest height of the top in one cycle of height change is arranged on the innermost diameter side in the tire radial direction, and the portion with the lowest height of the top is on the outermost diameter side in the tire radial direction. Since the lowest part of the top is arranged at the outermost side in the tire width direction, even when the top has the same height, it is relatively easy to protrude outward in the tire width direction. The protection performance of the rim flange can be further improved. In addition, since the position of the top part of the protruding protrusion changes along the circumferential direction, it tends to be excellent in design.

また、前記頂部の最も高い部分の高さが、前記頂部の最も低い部分の高さの１．５〜３倍であることが好ましい。頂部の高さの変化が、このような比率である場合、上記の如きリムフランジの保護性能およびリム組みの際の作業性の改善効果の程度とそれらのバランスとをより良好にすることができる。   Moreover, it is preferable that the height of the highest part of the top is 1.5 to 3 times the height of the lowest part of the top. When the change in the height of the top is such a ratio, it is possible to improve the degree of the protection performance of the rim flange as described above and the improvement effect of workability when assembling the rim and the balance thereof. .

以下、本発明の実施の形態について、図面を参照しながら説明する。図１は、本発明の空気入りタイヤの一例を示すタイヤ子午線断面図である。図２は、本発明の空気入りタイヤの一例の要部を示す図面であり、（ａ）は要部の斜視図、（ｂ）はそのＩ−Ｉ矢視断面図である（トレッドパターンは図示省略）。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a tire meridian cross-sectional view showing an example of the pneumatic tire of the present invention. FIG. 2 is a drawing showing a main part of an example of the pneumatic tire of the present invention, where (a) is a perspective view of the main part, and (b) is a cross-sectional view taken along the line I-I (a tread pattern is shown). (Omitted).

本発明の空気入りタイヤは、図１に示すように、リムフランジを保護するべく、リムフランジＲＦと対向するタイヤ内径側斜面１０ａを備えた***状突起１０をタイヤ周方向に設けたものである。本発明の空気入りタイヤは、この***状突起１０の形状以外は、従来の空気入りタイヤと同様の構造、トレッドパターン、材料、製法であり、従来公知のものがいずれも適用できる。   As shown in FIG. 1, the pneumatic tire of the present invention is provided with raised protrusions 10 having a tire inner diameter side slope 10 a facing the rim flange RF in the tire circumferential direction in order to protect the rim flange. . The pneumatic tire of the present invention has the same structure, tread pattern, material, and manufacturing method as those of the conventional pneumatic tire except for the shape of the raised protrusions 10, and any conventionally known one can be applied.

例えば、図１に示すように、一対の環状のビード部１と、そのビード部１から各々外周側へ延びるサイドウォール部２と、そのサイドウォール部２の各々の外周側端同士をショルダ部３を介して連ねるトレッド部４とを備える空気入りタイヤが例示される。   For example, as shown in FIG. 1, a pair of annular bead portions 1, sidewall portions 2 extending from the bead portions 1 to the outer peripheral side, and outer peripheral side ends of the sidewall portions 2 are connected to a shoulder portion 3. A pneumatic tire provided with the tread part 4 connected via is illustrated.

ビード部１にはカーカス層６に囲まれたビードコア７が配設され、このビードコア７によりカーカス層６の端部を巻き返して係止することで、ビード部１間がカーカス層６で補強された状態で、タイヤＴがリムＲ上に強固に嵌着される。カーカス層６のタイヤ軸方向外側には、リムストリップ８及びサイドウォール９により構成されるサイドゴム層５が形成されるが、単一のサイドゴム層５としてもよい。   A bead core 7 surrounded by the carcass layer 6 is disposed in the bead portion 1, and the end portion of the carcass layer 6 is rewound and locked by the bead core 7, so that the space between the bead portions 1 is reinforced by the carcass layer 6. In the state, the tire T is firmly fitted onto the rim R. A side rubber layer 5 composed of a rim strip 8 and a side wall 9 is formed on the outer side in the tire axial direction of the carcass layer 6, but may be a single side rubber layer 5.

本発明の空気入りタイヤＴは、例えば偏平率が５５％以下の偏平タイヤであり、少なくとも片側のビード部１付近の外側壁に***状突起１０を備える。***状突起１０は、規定リムへの装着時にリムフランジＲＦの外周側湾曲面に対向（当接してもよい）するタイヤ内径側斜面１０ａを有し、リムフランジＲＦを縁石等から好適に保護する。   The pneumatic tire T of the present invention is a flat tire having a flatness ratio of 55% or less, for example, and includes a raised protrusion 10 on the outer wall near the bead portion 1 on at least one side. The raised protrusion 10 has a tire inner diameter side inclined surface 10a that opposes (may contact) the outer peripheral side curved surface of the rim flange RF when mounted on the specified rim, and suitably protects the rim flange RF from curbstones and the like. .

本発明の空気入りタイヤＴは、図２に示すように、***状突起１０の頂部１０ｔがタイヤ全周に連続すると共に、その頂部１０ｔの高さがタイヤ周方向ＰＤに沿って大小交互に変化していることを特徴とする。本実施形態では、高さ変化の１周期における頂部の高さが最も高い部分１０ｈと最も低い部分１０ｌとが、略一定のピッチで交互に繰り返されている例を示す。   In the pneumatic tire T of the present invention, as shown in FIG. 2, the top portion 10t of the raised protrusion 10 is continuous with the entire circumference of the tire, and the height of the top portion 10t changes alternately in the tire circumferential direction PD. It is characterized by that. In the present embodiment, an example is shown in which the portion 10h having the highest height and the portion 101 having the lowest height in one cycle of the height change are alternately repeated at a substantially constant pitch.

本発明における***状突起１０の頂部１０ｔとは、タイヤ子午線断面において、サイドウォール部２を延長する円弧でビード部１とサイドウォール部２とを結ぶ基準線ＢＬから、高さが最も大きい部分を指し、高さの最も大きい部分が領域として存在する場合（台形に近い形状の場合など）は、その中央を指す。   The top portion 10t of the raised protrusion 10 in the present invention is a portion having the largest height from the reference line BL connecting the bead portion 1 and the sidewall portion 2 with an arc extending the sidewall portion 2 in the tire meridian cross section. If the area with the largest height exists as a region (such as a shape close to a trapezoid), it indicates the center.

本発明では、***状突起１０の頂部１０ｔの最も高い部分１０ｈの高さＨＨが、前記頂部１０ｔの最も低い部分１０ｌの高さＨＬの１．５〜３倍であることが好ましく、２〜２．５倍であることがより好ましい。この比率が１．５倍未満であると、高さを変化させることによる効果が小さくなる傾向があり、３倍を超えると縁石等に接触した際に、ゴムの破断が生じ易くなる傾向がある。   In the present invention, the height HH of the highest portion 10h of the top portion 10t of the raised protrusion 10 is preferably 1.5 to 3 times the height HL of the lowest portion 10l of the top portion 10t. More preferably, it is 5 times. If this ratio is less than 1.5 times, the effect of changing the height tends to be small, and if it exceeds 3 times, the rubber tends to break when it comes into contact with a curb or the like. .

従って、具体的な最も高い部分１０ｈの高さＨＨとしては、８．８〜１１．１ｍｍが好ましい。また、最も低い部分１０ｌの高さＨＬとしては、５．８〜３．７ｍｍが好ましい。   Therefore, the specific height HH of the highest portion 10h is preferably 8.8 to 11.1 mm. Further, the height HL of the lowest portion 10l is preferably 5.8 to 3.7 mm.

最も高い部分１０ｈと最も低い部分１０ｌとの繰り返しのピッチとしては、最も高い部分１０ｈ間の距離として、１５〜１００ｍｍが好ましく、３０〜６０ｍｍがより好ましい。ピッチがこの範囲より小さいと、頂部の高低差による応力集中からゴムの破断が生じ易くなる傾向があり、この範囲より大きいと、間隔が開きすぎて、リムフランジの保護性能が低下する傾向がある。   The repetition pitch between the highest portion 10h and the lowest portion 10l is preferably 15 to 100 mm, more preferably 30 to 60 mm, as the distance between the highest portions 10h. If the pitch is smaller than this range, the rubber tends to break easily due to the stress concentration due to the height difference of the top portion. If the pitch is larger than this range, the clearance is too wide and the protection performance of the rim flange tends to be lowered. .

頂部１０ｔの最も高い部分１０ｈと最も低い部分１０ｌとを結ぶ頂部１０ｔは、直線状でも曲線状でもよい。また、図２に示す例のように、頂部１０ｔが最も高い部分１０ｈで屈折していてもよい。   The top portion 10t connecting the highest portion 10h and the lowest portion 10l of the top portion 10t may be linear or curved. Further, as in the example shown in FIG. 2, the top 10t may be refracted at the highest portion 10h.

***状突起１０の幅（基準線ＢＬとの交点間の距離）は、従来と同様に、１０〜４０ｍｍが好ましい。但し、***状突起１０の幅は一定である必要はなく、例えば頂部１０ｔの最も低い部分１０ｌの位置では***状突起１０の幅を小さくしてもよい。   The width of the raised protrusion 10 (the distance between the intersections with the reference line BL) is preferably 10 to 40 mm, as in the conventional case. However, the width of the raised protrusion 10 need not be constant. For example, the width of the raised protrusion 10 may be reduced at the position of the lowest portion 10l of the top portion 10t.

［他の実施形態］
以下、本発明の他の実施の形態について説明する。 [Other Embodiments]
Hereinafter, other embodiments of the present invention will be described.

（１）前述の実施形態では、***状突起の頂部の位置がタイヤ径方向に変化せずにタイヤ周方向に連続する例を示したが、本発明では、***状突起の頂部の位置をタイヤ径方向に変化させてもよい。   (1) In the above-described embodiment, the example in which the position of the top of the raised protrusion is continuous in the tire circumferential direction without changing in the tire radial direction has been shown. You may change to radial direction.

例えば、図３に示す空気入りタイヤでは、***状突起１０の頂部１０ｔの高さが最も高い部分１０ｈはタイヤ半径方向ＲＤの最も内径側に配され、前記頂部１０ｔの高さが最も低い部分１０ｌはタイヤ半径方向ＲＤの最も外径側に配されている。   For example, in the pneumatic tire shown in FIG. 3, the portion 10h having the highest height of the top portion 10t of the raised protrusion 10 is disposed on the innermost diameter side in the tire radial direction RD, and the portion 10l having the lowest height of the top portion 10t. Are arranged on the outermost diameter side in the tire radial direction RD.

（２）また、本発明ではこの例のように、***状突起１０の幅を変化させながら、タイヤ周方向に連続するようにしてもよい。つまり、この例では、***状突起１０のタイヤ半径方向ＲＤの外径側端の位置は変化させずに、***状突起１０のタイヤ半径方向ＲＤの内径側端の位置のみを変化させて、***状突起１０の幅を変化させている。その際、頂部１０ｔの高さが最も低い部分１０ｌに、***状突起１０の幅が最も小さい位置を対応させている。   (2) Moreover, in this invention, you may make it continue in a tire circumferential direction, changing the width | variety of the protruding protrusion 10 like this example. In other words, in this example, the position of the ridge-like protrusion 10 in the tire radial direction RD is not changed, and only the position of the ridge-like protrusion 10 in the tire radial direction RD on the inner diameter side is changed. The width of the protrusion 10 is changed. At that time, a position where the width of the raised protrusion 10 is the smallest corresponds to the portion 101 having the lowest height of the top portion 10t.

（３）前述の実施形態では、***状突起の断面形状が略三角形の場合の例を示したが、本発明では、***状突起の断面形状は、略三角形の場合に限られず、略台形、略半円形、略三日月形など何れの形状でもよい。   (3) In the above-described embodiment, an example in which the cross-sectional shape of the raised protrusion is a substantially triangular shape is shown. However, in the present invention, the cross-sectional shape of the raised protrusion is not limited to a substantially triangular shape, and a substantially trapezoidal shape. Any shape such as a substantially semicircular shape or a substantially crescent shape may be used.

（４）前述の実施形態では、頂部の高さが最も高い部分と最も低い部分とが、略一定のピッチで交互に繰り返されている例を示したが、本発明における頂部の高さ変化のピッチは、略一定でなくてもよい。例えば、ランダムなピッチや、規則的にピッチが変化するものでもよい。   (4) In the above-described embodiment, the example in which the highest part and the lowest part of the top part are alternately repeated at a substantially constant pitch has been described. The pitch may not be substantially constant. For example, a random pitch or a pitch that changes regularly may be used.

（５）前述の実施形態では、***状突起の頂部の高さ変化の１周期における最も高い部分の高さ、および最も低い部分の高さが、タイヤ全周で一定である例を示したが、高さ変化の１周期ごとに頂部の最も高い部分の高さ、および最も低い部分の高さを変化させてもよい。   (5) In the above-described embodiment, the example in which the height of the highest portion and the height of the lowest portion in one cycle of the height change of the top of the ridge-shaped protrusion is constant over the entire circumference of the tire is shown. The height of the highest part at the top and the height of the lowest part may be changed for each cycle of the height change.

以下、本発明の構成と効果を具体的に示す実施例等について説明する。なお、タイヤの各性能評価は、次のようにして行った。   Examples and the like specifically showing the configuration and effects of the present invention will be described below. In addition, each performance evaluation of the tire was performed as follows.

（１）リムフランジ保護性
タイヤをサイズ１６×６．５ＪＪのリムに組み込んで、実車に装着し、縁石に対して角度５°、速度５ｋｍ/ｈで進入し、縁石接触後は平行に５ｍ走行した際のリムフランジの損傷状態を、従来品を基準として相対的に評価した。◎は従来品より良好、○は従来品と同等、×は従来品より劣る、である。 (1) Rim flange protection The tire is mounted on a rim of size 16 x 6.5 JJ, mounted on the actual vehicle, enters the curb at an angle of 5 °, and at a speed of 5 km / h. The damage state of the rim flange during the evaluation was relatively evaluated based on the conventional product. ◎ is better than the conventional product, ○ is the same as the conventional product, and X is inferior to the conventional product.

（２）リム組み作業性
タイヤを上記（１）と同じサイズのリムに、実際に組み込んだ際の作業性を、従来品を基準として相対的に評価した。◎は従来品より良好、○は従来品と同等、×は従来品より劣る、である。 (2) Rim assembly workability The workability when the tire was actually installed on the rim of the same size as the above (1) was relatively evaluated based on the conventional product. ◎ is better than the conventional product, ○ is the same as the conventional product, and X is inferior to the conventional product.

（３）***状突起の破断耐久性
上記（１）の試験を行った際に生じた***状突起の破断やクラックを目視検査することで、従来品を基準として相対的に評価した。◎は従来品より良好、○は従来品と同等、×は従来品より劣る、である。 (3) Rupture durability of raised protrusions Relative evaluation was made based on the conventional product by visual inspection for the breakage and cracks of the raised protrusions generated when the test of (1) was performed. ◎ is better than the conventional product, ○ is the same as the conventional product, and X is inferior to the conventional product.

比較例１（従来品）
図１に示す空気入りタイヤにおいて、略三角形の断面形状を有する***状突起の幅を２４ｍｍ、高さを７ｍｍで一定にして、サイズ２０５／５５Ｒ１６のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表１に示す。 Comparative example 1 (conventional product)
In the pneumatic tire shown in FIG. 1, a radial tire of size 205 / 55R16 was manufactured with the width of the raised protrusions having a substantially triangular cross-sectional shape being constant at 24 mm and the height at 7 mm. Table 1 shows the results of each performance evaluation described above using this tire.

実施例１
図２に示す空気入りタイヤ（***状突起以外は図１と同じ）において、略三角形の断面形状を有する***状突起の幅を２４ｍｍで一定にし、高さを最大部で１０ｍｍ、最小部で４ｍｍにして、これをピッチ４０ｍｍで交互に繰り返して、サイズ２０５／５５Ｒ１６のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表１に示す。 Example 1
In the pneumatic tire shown in FIG. 2 (the same as FIG. 1 except for the raised protrusions), the width of the raised protrusions having a substantially triangular cross-sectional shape is constant at 24 mm, the height is 10 mm at the maximum part, and 4 mm at the minimum part. This was repeated alternately at a pitch of 40 mm to produce a radial tire of size 205 / 55R16. Table 1 shows the results of each performance evaluation described above using this tire.

実施例２
図３に示す空気入りタイヤ（***状突起以外は図１と同じ）において、略三角形の断面形状を有する***状突起の幅を２４ｍｍで一定にし、高さを最大部で１０ｍｍ、最小部で４ｍｍにして、更に高さの最小部の位置を最大部よりタイヤ半径方向外側に６ｍｍシフトさせて、これをピッチ４０ｍｍで交互に繰り返して、サイズ２０５／５５Ｒ１６のラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表１に示す。 Example 2
In the pneumatic tire shown in FIG. 3 (the same as FIG. 1 except for the raised protrusions), the width of the raised protrusions having a substantially triangular cross-sectional shape is constant at 24 mm, the height is 10 mm at the maximum part, and 4 mm at the minimum part. Then, the position of the minimum portion of the height was further shifted by 6 mm outward from the maximum portion in the tire radial direction, and this was alternately repeated at a pitch of 40 mm to manufacture a radial tire of size 205 / 55R16. Table 1 shows the results of each performance evaluation described above using this tire.

比較例２
比較例１において、***状突起の高さを１４ｍｍ（２倍）にしたこと以外は、比較例１と同様にしてラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表１に示す。 Comparative Example 2
In Comparative Example 1, a radial tire was manufactured in the same manner as in Comparative Example 1, except that the height of the raised protrusions was 14 mm (2 times). Table 1 shows the results of each performance evaluation described above using this tire.

比較例３
比較例１において、***状突起の高さを１４ｍｍ（２倍）にすると共に、タイヤ周方向に断続的（存在部の長さ５ｍｍ、不存在部の長さ５ｍｍ）に***状突起を設けたこと以外は、比較例１と同様にしてラジアルタイヤを製造した。このタイヤを用いて、上記の各性能評価を行った結果を表１に示す。 Comparative Example 3
In Comparative Example 1, the height of the raised protrusions was 14 mm (twice), and the raised protrusions were provided intermittently in the tire circumferential direction (existing portion length 5 mm, non-existing portion length 5 mm). Except for this, a radial tire was manufactured in the same manner as in Comparative Example 1. Table 1 shows the results of each performance evaluation described above using this tire.

Figure 0004745026
Figure 0004745026

表１の結果が示すように、実施例の空気入りタイヤは、従来品と比較して、リムフランジの保護性能を向上させることができ、しかもゴムの破断が生じにくく、リム組みの際の作業性も十分維持できた。これに対して、***状突起の高さ２倍にした比較例１では、リム組みの際の作業性が低下し、また、***状突起の高さ２倍にしつつ断続的に設けた比較例２では、***状突起の破断耐久性が劣っていた。   As shown in the results of Table 1, the pneumatic tires of the examples can improve the protection performance of the rim flange as compared with the conventional products, and the rubber rupture is less likely to occur. The sex was also maintained sufficiently. On the other hand, in Comparative Example 1 in which the height of the raised protrusion is doubled, the workability at the time of assembling the rim is lowered, and the comparative example is provided intermittently while making the height of the raised protrusion twice. In No. 2, the breaking durability of the raised protrusions was inferior.

本発明の空気入りタイヤの一例を示すタイヤ子午線断面図Tire meridian cross-sectional view showing an example of the pneumatic tire of the present invention 本発明の空気入りタイヤの一例の要部を示す図面であり、（ａ）は要部の斜視図、（ｂ）はそのＩ−Ｉ矢視断面図BRIEF DESCRIPTION OF THE DRAWINGS It is drawing which shows the principal part of an example of the pneumatic tire of this invention, (a) is a perspective view of the principal part, (b) is the II arrow sectional drawing. 本発明の空気入りタイヤの他の例を示す斜視図The perspective view which shows the other example of the pneumatic tire of this invention

符号の説明Explanation of symbols

１０ ***状突起
１０ａ タイヤ内径側斜面
１０ｈ 最も高い部分
１０ｌ 最も低い部分
１０ｔ ***状突起の頂部
ＨＨ 最も高い部分の高さ
ＨＬ 最も低い部分の高さ
ＢＬ 基準線
ＲＦ リムフランジ
ＰＤ タイヤ周方向 DESCRIPTION OF SYMBOLS 10 Raised protrusion 10a Tire inner-side slope 10h Highest part 10l Lowest part 10t Top part of raised protrusion HH Height of highest part HL Height of lowest part BL Reference line RF Rim flange PD Tire circumferential direction

Claims (2)

リムフランジを保護するべく、リムフランジと対向するタイヤ内径側斜面を備えた***状突起をタイヤ周方向に設けた空気入りタイヤにおいて、
前記***状突起の頂部がタイヤ全周に連続すると共に、その頂部の高さがタイヤ周方向に沿って大小交互に変化しており、高さ変化の１周期における前記頂部の高さが最も高い部分はタイヤ半径方向の最も内径側に配され、前記頂部の高さが最も低い部分はタイヤ半径方向の最も外径側に配されていることを特徴とする空気入りタイヤ。 To protect the rim flange, in a pneumatic tire provided with raised protrusions with a tire inner diameter side slope facing the rim flange in the tire circumferential direction,
The tops of the raised protrusions continue to the entire circumference of the tire, and the heights of the tops change alternately in the tire circumferential direction, and the height of the top is highest in one cycle of the height change. The pneumatic tire is characterized in that the portion is disposed on the innermost diameter side in the tire radial direction, and the portion having the lowest top portion is disposed on the outermost diameter side in the tire radial direction . 前記頂部の最も高い部分の高さが、前記頂部の最も低い部分の高さの１．５〜３倍である請求項１記載の空気入りタイヤ。 The pneumatic tire according to claim 1 , wherein the height of the highest part of the top is 1.5 to 3 times the height of the lowest part of the top.
JP2005324815A 2005-11-09 2005-11-09 Pneumatic tire Expired - Fee Related JP4745026B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH068008U (en) * 1992-07-13 1994-02-01 横浜ゴム株式会社 Pneumatic tires for passenger cars
JPH08258518A (en) * 1995-03-24 1996-10-08 Bridgestone Corp Pneumatic tire provided with rim guard
JPH08282218A (en) * 1995-04-11 1996-10-29 Bridgestone Corp Flat pneumatic tire having rim guard
JP2002059712A (en) * 2000-08-14 2002-02-26 Bridgestone Corp Pneumatic tire
JP2006168499A (en) * 2004-12-15 2006-06-29 Bridgestone Corp Pneumatic tire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH068008U (en) * 1992-07-13 1994-02-01 横浜ゴム株式会社 Pneumatic tires for passenger cars
JPH08258518A (en) * 1995-03-24 1996-10-08 Bridgestone Corp Pneumatic tire provided with rim guard
JPH08282218A (en) * 1995-04-11 1996-10-29 Bridgestone Corp Flat pneumatic tire having rim guard
JP2002059712A (en) * 2000-08-14 2002-02-26 Bridgestone Corp Pneumatic tire
JP2006168499A (en) * 2004-12-15 2006-06-29 Bridgestone Corp Pneumatic tire

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