PNEUMATIC TIRE

• Main Authors: SHIMIZU EISEI, MINAMI YUJI
• Format: Patent
• Language: English; Japanese
• Published: 07.12.2015
• Subjects: DEVICES OR ARRANGEMENTS RELATED TO TYRES; PERFORMING OPERATIONS; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; VEHICLE TYRES; VEHICLES IN GENERAL

PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of reducing tire weight and achieving both steering stability and low fuel consumption performance.SOLUTION: There is provided a pneumatic tire including a tread part 1, sidewall parts 2, and bead parts 3, provided with at least one carcass layer 4 between a pair of the bead parts 3 and 3. The pneumatic tire makes a ratio (SW/OD) between a tire total width SW and a tire outer diameter OD satisfy a relationship of SW/OD≤0.3; a first region A is partitioned by and between a pair of first border lines L1 and L1; a second region B is partitioned by and between the first border line L1 and a second border line L2; and a third region C is partitioned to a bead toe side other than the second border line L2. Assuming that the cross-sectional area (mm) of the first region A, the second region B, or the third region C is SA, SB or SC, respectively, and a periphery length (mm) along the tire inner surface of the first region A, the second region B, or the third region C is a, b or c, respectively, a ratio SA/a satisfies a relationship of 7.5≤SA/a≤11.5, and a ground contact groove area ratio GR in a ground contact region of the tread part 1 is 25% or less. 【課題】 タイヤ重量を低減し、操縦安定性と低燃費性能とを両立することを可能にした空気入りタイヤを提供する。【解決手段】 トレッド部１とサイドウォール部２とビード部３とを備え、該一対のビード部３，３間に少なくとも１層のカーカス層４を装架した空気入りタイヤにおいて、タイヤ総幅ＳＷとタイヤ外径ＯＤとの比ＳＷ／ＯＤがＳＷ／ＯＤ ０．３の関係を満足すると共に、一対の第一境界線Ｌ１，Ｌ１の相互間に第一領域Ａを区分し、第一境界線Ｌ１と第二境界線Ｌ２との間に第二領域Ｂを区分し、第二境界線Ｌ２よりもビードトウ側に第三領域Ｃを区分し、第一領域Ａ乃至第三領域Ｃの断面積（ｍｍ2）をそれぞれＳＡ，ＳＢ，ＳＣとし、第一領域Ａ乃至第三領域Ｃのタイヤ内面に沿ったペリフェリ長さ（ｍｍ）をそれぞれａ，ｂ，ｃとしたとき、比ＳＡ／ａについて７．５ ＳＡ／ａ １１．５の関係を満足し、トレッド部１の接地領域における溝面積比率ＧＲが２５％以下である。【選択図】 図２