公开(公告)号：EP3056355A4

公开(公告)日：2016-10-26

申请号：EP14852374

申请日：2014-06-30

Applicant: BRIDGESTONE CORP

Inventor： WAKIYAMA TADASHI ,  HAYASHI SHOJI ,  MATSUNAGA IETOMO ,  WADA MASAKI ,  KOIDE MASAFUMI ,  NAKAI TATSUYA

IPC: B60C11/00 ,  B60C5/00 ,  B60C11/04 ,  B60C11/11

CPC classification number: B60C11/0332 ,  B60C11/0302 ,  B60C11/0304 ,  B60C11/0306 ,  B60C11/1376 ,  B60C2011/0341 ,  B60C2011/0386

Abstract: An object is to improve noise performance of a tire while enhancing movement performance thereof. At least one of the land portions (20) includes an outer wall surface (30) positioned on a vehicle outer side, an inner wall surface (31) positioned on a vehicle inner side, a tread surface (32) on an outer side in a tire radial direction, an outer edge (33) of the tread surface (32) in contact with the outer wall surface (30), and an inner edge (34) of the tread surface (32) in contact with the inner wall surface (31). The tread surface (32) is formed in a convex shape which is smoothly curved between the outer edge (33) and the inner edge (34) and which has a top portion (43) most protruded outward in the tire radial direction, in a cross section of the land portion (20) in a tire width direction. A relationship of Do

公开(公告)号：EP3147140A4

公开(公告)日：2017-06-07

申请号：EP15795565

申请日：2015-04-22

Applicant: BRIDGESTONE CORP

Inventor： MATSUNAGA IETOMO ,  WAKIYAMA TADASHI

IPC: B60C11/13 ,  B60C11/03

CPC classification number: B60C11/1323 ,  B60C5/00 ,  B60C11/03 ,  B60C11/0302 ,  B60C11/0304 ,  B60C11/13

Abstract: A pneumatic tire includes a tread having a tread surface, plural circumferential main grooves formed on the tread, and plural land portions formed, on the tread, between the plural circumferential main grooves. Each of the plural circumferential main grooves has, in a lateral cross-sectional view, a groove bottom surface, an outside groove wall surface located on an installation outer side, an inside groove wall surface located on an installation inner side, an outside curved portion connecting the groove bottom surface with the outside groove wall surface, and an inside curved portion connecting the groove bottom surface with the inside groove wall surface. In the lateral cross-sectional view, (a minimum curvature radius of the outside curved portion) > (a minimum curvature radius of the inside curved portion) is satisfied. When, in the lateral cross-sectional view, an angle of the outside groove wall surface to a tread normal line at a border edge between the outside groove wall surface and the tread surface is denoted as a groove wall angle ± and an angle of the outside groove wall surface to a tread normal line at a border edge between the inside groove wall surface and the tread surface is denoted as a groove wall angle ², (the groove wall angle ±)

Abstract translation: 一种充气轮胎，包括：具有胎面表面的胎面，形成在胎面上的多个周向主槽和在胎面上形成在多个周向主槽之间的多个陆部。 多个周向主槽中的每一个在横向剖视图中具有槽底表面，位于安装外侧的外侧槽壁表面，位于安装内侧的内侧槽壁表面，外侧弯曲部分 将槽底表面与外侧槽壁表面连接，以及将槽底表面与内侧槽壁表面连接的内侧弯曲部分。 在横截面图中，（外侧弯曲部分的最小曲率半径）>（内侧弯曲部分的最小曲率半径）得到满足。 在横剖视图中，将外侧槽壁面与胎面表面之间的边界边缘处的外侧槽壁表面相对于胎面法线的角度表示为槽壁角度±和角度 外侧槽壁面与内侧槽壁面与胎面表面之间的边界边缘处的胎面法线表示为槽壁角²，（槽壁角度±）<（槽壁角度）满足。