PROBLEM TO BE SOLVED: To provide a pneumatic tire capable of achieving uniformization of a rib grounding shape and improving the steering stability and uneven wear resistance.SOLUTION: The tread part of a pneumatic tire has the first and second circumferential main grooves extending, respectively in a tire circumferential direction, and a rib provided between those main grooves. A rib ground plane protrudes outside the reference contour line of the tread part in a tire radial direction. The surface of the rib includes the first and second belt regions divided by a rib center in a tire width direction as a boundary and extending respectively in the tire circumferential direction. A groove volume ratio which is a ratio of the volume of a lug groove provided to the rib to that of a tread rubber in the rib in the first belt region is different from the ratio in the second belt region. The maximum protrusion part indicating the maximum value of a protrusion amount from a reference contour line among the rib ground plane is provided to either one of the first or second belt region having the larger groove volume ratio.SELECTED DRAWING: Figure 4
【課題】リブの接地形状の均一化を図り、操縦安定性能及び耐偏摩耗性能を向上することができる空気入りタイヤを提供する。【解決手段】空気入りタイヤのトレッド部は、タイヤ周方向にそれぞれ延在する第1周方向主溝及び第2周方向主溝と、第1周方向主溝と第2周方向主溝との間に設けられるリブと、を有する。リブの接地面は、トレッド部の基準輪郭線よりもタイヤ径方向外側に突出する。リブの表面は、タイヤ幅方向のリブの中心を境界として分けられた、タイヤ周方向にそれぞれ延在する第1ベルト領域と第2ベルト領域とを含む。リブのトレッドゴムの体積とリブに設けられるラグ溝の体積との比である溝体積比は、第1ベルト領域と第2ベルト領域とで異なる。リブの接地面のうち基準輪郭線からの突出量が最大値を示す最大突出部は、溝体積比が大きい第1ベルト領域及び第2ベルト領域のいずれか一方に設けられる。【選択図】図4
PNEUMATIC TIRE AND DESIGN METHOD FOR PNEUMATIC TIRE
空気入りタイヤ及び空気入りタイヤの設計方法
03.08.2017
Patent
Elektronische Ressource
Japanisch
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |
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