JPS6387302A - Pneumatic tire - Google Patents
Pneumatic tireInfo
- Publication number
- JPS6387302A JPS6387302A JP61229939A JP22993986A JPS6387302A JP S6387302 A JPS6387302 A JP S6387302A JP 61229939 A JP61229939 A JP 61229939A JP 22993986 A JP22993986 A JP 22993986A JP S6387302 A JPS6387302 A JP S6387302A
- Authority
- JP
- Japan
- Prior art keywords
- tire
- center
- circumferential direction
- bulged
- curvature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009534 blood test Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Tires In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、タイヤ踏面の接地圧分布を均一化させること
により操縦安定性を向上させた空気入りタイヤに関する
。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pneumatic tire with improved handling stability by uniformizing the ground pressure distribution on the tire tread surface.
従来、走行路面における接地幅の広いタイヤは、スチー
ルベルト層を幅広く配置できるためベルト剛性が高く、
コーナリング時の限界性能に優れている。しかし、タイ
ヤ踏面の接地圧分布が一様でなく、接地端部とセンター
部との間の中間領域では他の部分よりも接地圧が低くな
るため高速走行時の運動性能が低下する欠点がある。Conventionally, tires with a wide contact width on the road surface have high belt rigidity because the steel belt layer can be spread over a wide range.
Excellent limit performance during cornering. However, the ground pressure distribution on the tire tread is not uniform, and the ground pressure is lower in the middle area between the edge of the tire and the center than in other areas, which has the disadvantage of reducing maneuverability during high-speed driving. .
本発明は、接地幅の広い乗用車用空気入りタイヤのプロ
ファイルを工夫することによりなされたもので、タイヤ
踏面の接地圧分布を均一化させることにより高速走行時
の運動性能、特に操縦安定性を向上させた空気入りタイ
ヤを提供することを目的とする。The present invention was achieved by devising the profile of a pneumatic tire for passenger cars with a wide ground contact width, and by equalizing the ground pressure distribution on the tire tread surface, it improves driving performance during high-speed driving, especially steering stability. The purpose of the present invention is to provide a pneumatic tire with improved performance.
このため、本発明は、タイヤ踏面のセンター部を周方向
に環状に膨出させ、該センター部とショルダー部との間
の少なくとも１箇所を周方向に環状に膨出させたことを
特徴とする空気入りタイヤを要旨とするものである。Therefore, the present invention is characterized in that the center portion of the tire tread is annularly bulged in the circumferential direction, and at least one location between the center portion and the shoulder portion is annularly bulged in the circumferential direction. This article focuses on pneumatic tires.
以下、図を参照して本発明の構成につき詳しく説明する
。Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.
第１図は、本発明の空気入りタイヤのプロファイルの一
例を示す説明図である。この第１図において、１はセン
ター部（タイヤ踏面における幅方向中心付近）、３はシ
ョルダー部、２はセンター部１とショルダー部３との間
の中間領域である。FIG. 1 is an explanatory diagram showing an example of the profile of the pneumatic tire of the present invention. In FIG. 1, 1 is a center portion (near the widthwise center of the tire tread surface), 3 is a shoulder portion, and 2 is an intermediate region between the center portion 1 and the shoulder portion 3.
本発明では、センター部１は周方向に環状に膨出してい
る。この膨出部の表面形状は、赤道中心線Ｅの上に中心
点を有する曲率半径Ｒ３の曲線で形成される。Ａは、そ
の曲線の頂点である。In the present invention, the center portion 1 bulges in an annular shape in the circumferential direction. The surface shape of this bulge is formed by a curved line having a center point on the equatorial centerline E and a radius of curvature R3. A is the vertex of the curve.
また、本発明では、中間領域２の少な（とも１箇所が周
方向に環状に膨出している（第１図では１箇所のみ）、
この膨出部の表面形状は、曲率半径Ｒ２の曲線で形成さ
れる。Ｂは、その曲線の頂点である。In addition, in the present invention, the intermediate region 2 is small (one location in each case bulges out in an annular shape in the circumferential direction (only one location in FIG. 1),
The surface shape of this bulge is formed by a curved line with a radius of curvature R2. B is the vertex of the curve.
曲率半径Ｒ３と曲率半径Ｒ２については、Ｒ１＞ＲＺで
あって、０．２ ＜ Ｒｚ ／ Ｒ＋ ≦０゜５である
ことが好ましい、ＲＩ≦Ｒ２の場合には、従来タイヤの
プロファイル（第３図（Ａ）参照）と同様な接地圧分布
となり易く、センター部の接地圧が低下するからである
。Regarding the radius of curvature R3 and the radius of curvature R2, it is preferable that R1>RZ and 0.2<Rz/R+≦0°5. In the case of RI≦R2, the profile of the conventional tire (Fig. 3) This is because the ground pressure distribution tends to be similar to (see (A)), and the ground pressure at the center portion decreases.
０．２≧Ｒｚ ／ Ｒｌでは、滑らかな円弧にてショル
ダー部３を形成するためには曲率半径Ｒ２の頂点Ｂがシ
ョルダー部に位置することになるので（距離すが大とな
る）、結果的にショルダー部の接地圧が高くなり、中間
領域２の接地圧が低（なって期待の効果が得られない。When 0.2≧Rz/Rl, in order to form the shoulder portion 3 with a smooth circular arc, the vertex B of the radius of curvature R2 will be located at the shoulder portion (the distance will be large), so as a result, The ground pressure at the shoulder part becomes high, and the ground pressure at the intermediate region 2 becomes low (so that the expected effect cannot be obtained).
Ｒｚ ／Ｒ＋ ＞ｏ、ｓの場合には、従来タイヤのプロ
ファイル（第３図（Ａ）参照）と同様な接地圧分布とな
り易く、また、ショルダー部がラウンド形状となりにく
いので耐摩耗性能上不利となる。When Rz /R+ > o, s, the ground pressure distribution tends to be similar to the profile of conventional tires (see Figure 3 (A)), and the shoulder part is less likely to have a round shape, which is disadvantageous in terms of wear resistance. Become.
また、赤道中心線ＥからＢ点までの距離すと接地幅の半
分Ｗとの比ｂ／Ｗは、Ｑ、３＜ｂ／Ｗく０．５であるこ
とが好ましい。０．３≧ｂ／Ｗの場合には、従来タイヤ
のプロファイル（第２図（Ａ）参照）と同様な接地圧分
布となり易い、ｂ／Ｗ≧０．５では、Ｂ点での接地圧向
上効果がパターン的にショルダー部に現れてしまい、従
来タイヤのプロファイルの接地圧分布の高低を顕著にし
たような分布となってしまう。Further, the ratio b/W of the distance from the equatorial centerline E to point B to half the ground contact width W is preferably 0.5, where Q,3<b/W. When 0.3≧b/W, the ground pressure distribution tends to be similar to the profile of a conventional tire (see Figure 2 (A)); when b/W≧0.5, the ground pressure distribution at point B increases. The effect appears in a pattern in the shoulder area, resulting in a distribution that makes the height and low of the ground pressure distribution of a conventional tire profile more pronounced.
つぎに実施例を示す。Next, examples will be shown.
実施例
下記のタイヤにつき、接地圧分布および高速操縦安定性
を評価した。EXAMPLE The following tires were evaluated for ground pressure distribution and high-speed steering stability.
（１）従来タイヤ１゜ 第２図（Ａ）に示すプロファイルを有する。(1) Conventional tire 1° It has the profile shown in FIG. 2(A).
すなわち、接地領域は単一円弧で構成。接地形状は第２
図（Ｂ）に示すように楕円形状。In other words, the ground contact area consists of a single circular arc. The grounding shape is the second
Oval shape as shown in figure (B).
第２図（Ｂ）において、４は踏面を表わす。In FIG. 2(B), 4 represents the tread surface.
（２）従来タイヤ２゜ 第３図（Ａ）に示すプロファイルを有する。(2) Conventional tire 2° It has the profile shown in FIG. 3(A).
すなわち、赤道中心線に対し対称の２つの相似形の円弧
で構成。接地形状は第３図（Ｂ）に示すように繭玉形状
。In other words, it is composed of two similar circular arcs that are symmetrical about the equator center line. The ground contact shape is a cocoon ball shape as shown in Figure 3 (B).
（３）本発明タイヤ。(3) Tire of the present invention.
第４図（Ａ）に示すプロファイルを有する。It has the profile shown in FIG. 4(A).
すなわち、踏面を３つの円弧で構成。接地形状は第４図
（Ｂ）に示すように鼓形状。In other words, the tread consists of three arcs. The ground contact shape is a drum shape as shown in Figure 4 (B).
１並圧立血夏往璽：
所定空気圧および所定過重を与え、特定の試験機で接地
面内のタイヤ幅方向および周方向の測定点を求め、それ
ぞれの接地圧を測定することにより接地圧分布を評価し
た。この結果を第５図（Ａ）〜（Ｃ）に示す。第５図（
Ａ）は従来タイヤ１の場合を、第５図（Ｂ）は従来タイ
ヤ２の場合を、第５図（Ｃ）は本発明タイヤの場合を表
わす。これらの第５図（Ａ）〜（Ｃ）から、従来タイヤ
１は中間領域の接地圧が低くなっており（第５図（Ａ）
）、従来タイヤ２はセンター部およびショルダー部の両
方の接地圧が低くなっていて（第５図（Ｂ））、それぞ
れ接地圧の均一性に問題があるが、本発明タイヤはこれ
らの領域において接地圧に殆ど変化がないことが判る。1 Parallel pressure standing blood test: Applying a predetermined air pressure and a predetermined overload, measuring points in the tire width direction and circumferential direction within the contact patch using a specific testing machine, and measuring the contact pressure at each point to determine the contact pressure distribution. was evaluated. The results are shown in FIGS. 5(A) to 5(C). Figure 5 (
A) shows the case of the conventional tire 1, FIG. 5(B) shows the case of the conventional tire 2, and FIG. 5(C) shows the case of the tire of the present invention. From these FIGS. 5(A) to 5(C), it can be seen that the ground contact pressure in the intermediate region of the conventional tire 1 is low (see FIG. 5(A)).
), the conventional tire 2 has low ground contact pressure in both the center and shoulder areas (Fig. 5 (B)), and there is a problem with the uniformity of the ground pressure in each area, but the tire of the present invention has low ground contact pressure in both the center and shoulder areas (Fig. It can be seen that there is almost no change in ground pressure.
゛束６ のｉ ；
速度１６０〜２００ｋｍ／ｈにおいて実車官能評価を実
施することにより高速操縦安定性を評価した。この結果
を下記表１に指数で示す。数値の高い方が良い０表１か
ら、本発明タイヤが高速操縦安定性に優れていることが
判る。i of Bundle 6: High-speed steering stability was evaluated by conducting an actual vehicle sensory evaluation at a speed of 160 to 200 km/h. The results are shown in Table 1 below using indices. The higher the value, the better. From Table 1, it can be seen that the tire of the present invention has excellent high-speed handling stability.
表１
従来タイ 従来タイ 本発明
〔発明の効果〕
以上説明したように本発明によれば、タイヤ踏面の接地
圧分布を均一化させ、高速走行時の運動性能を向上させ
ることができる。Table 1 Conventional tie Conventional tie Present invention [Effects of the invention] As explained above, according to the present invention, it is possible to equalize the ground contact pressure distribution on the tire tread surface and improve the motion performance during high-speed running.
第１図は本発明の空気入りタイヤのプロファイルの一例
を示す説明図、第２図（Ａ）。
第３図（Ａ）、第４図（Ａ）は各種タイヤのプロファイ
ルを示す説明図、第２図（Ｂ）。
第３図（Ｂ）、第４図（Ｂ）は各種タイヤの接地形状を
示す説明図、第５図（Ａ）、第５図（Ｂ）、第５図（Ｃ
）は各種タイヤの接地圧分布をグラフで示した説明図で
ある。
ｌ・・・センター部、２・・・中間領域、３・・・ショ
ルダー部、４・・・踏面。
第１図
第２図（Ａ） 第２図（Ｂ）第３図（Ａ）
第３図（Ｂ）FIG. 1 is an explanatory diagram showing an example of the profile of the pneumatic tire of the present invention, and FIG. 2 (A). FIG. 3(A) and FIG. 4(A) are explanatory diagrams showing profiles of various tires, and FIG. 2(B). Figures 3 (B) and 4 (B) are explanatory diagrams showing the contact shapes of various tires, Figure 5 (A), Figure 5 (B), and Figure 5 (C).
) is an explanatory diagram showing the ground contact pressure distribution of various tires in a graph. l...center part, 2...middle area, 3...shoulder part, 4...tread surface. Figure 1 Figure 2 (A) Figure 2 (B) Figure 3 (A) Figure 3 (B)
Claims (1)
とも１箇所を周方向に環状に膨出させたことを特徴とす
る空気入りタイヤ。[Scope of Claims] Air characterized by having a center portion of a tire tread bulge out in a circumferentially annular manner, and at least one location between the center portion and a shoulder portion being annularly bulged in the circumferential direction. Included tires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61229939A JPH06102401B2 (en) | 1986-09-30 | 1986-09-30 | Pneumatic radial tires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61229939A JPH06102401B2 (en) | 1986-09-30 | 1986-09-30 | Pneumatic radial tires |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6387302A true JPS6387302A (en) | 1988-04-18 |
| JPH06102401B2 JPH06102401B2 (en) | 1994-12-14 |
Family
ID=16900087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61229939A Expired - Lifetime JPH06102401B2 (en) | 1986-09-30 | 1986-09-30 | Pneumatic radial tires |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06102401B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5327952A (en) * | 1991-03-08 | 1994-07-12 | The Goodyear Tire & Rubber Company | Pneumatic tire having improved wet traction |
| US5595619A (en) * | 1992-10-14 | 1997-01-21 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including shoulder parts |
| US5688342A (en) * | 1993-12-27 | 1997-11-18 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire having ground contacting area |
| US5810953A (en) * | 1992-10-14 | 1998-09-22 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including two grooves and two rubber parts |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4734901U (en) * | 1971-05-17 | 1972-12-19 |
-
1986
- 1986-09-30 JP JP61229939A patent/JPH06102401B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4734901U (en) * | 1971-05-17 | 1972-12-19 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5327952A (en) * | 1991-03-08 | 1994-07-12 | The Goodyear Tire & Rubber Company | Pneumatic tire having improved wet traction |
| US5595619A (en) * | 1992-10-14 | 1997-01-21 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including shoulder parts |
| US5810953A (en) * | 1992-10-14 | 1998-09-22 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire including two grooves and two rubber parts |
| US5688342A (en) * | 1993-12-27 | 1997-11-18 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire having ground contacting area |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06102401B2 (en) | 1994-12-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |