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2. 发明授权

US6125899A Heavy duty pneumatic radial tire for running on rough ground surface 失效
标题翻译：重型充气子午线轮胎，用于在粗糙的地面上行驶
公开(公告)号：US6125899A
公开(公告)日：2000-10-03
申请号：US23487
申请日：1998-02-13
申请人： Ken Takahashi , Norio Ohmoto
发明人： Ken Takahashi , Norio Ohmoto
IPC分类号： B60C9/20 , B60C9/28 , B60C9/18
CPC分类号： B60C9/28 , B60C9/2006 , B60C9/2009 , Y10T152/10765 , Y10T152/10792
摘要： In a heavy duty pneumatic radial tire, at least one carcass layer is provided between right and left bead portions and at least two belt layers formed of steel cords which exhibit a breaking elongation of 4% or less are arranged in an outer periphery of the carcass layer in a tread portion. The belt layers are composed of at least one upper belt layer (A) and at least one lower belt layer (B). The upper belt layer (A) has a belt width that is 0.6 times or less a carcass line maximum width SW of the carcass layer at a tire section and the lower belt layer (B) has a belt width such that both end portions thereof extend to tread shoulder portions. An inclination angle of the steel cords of the lower belt layer (B) relative to a tire circumferential direction is set to be larger than that of the upper belt layer (A). A ratio (Mb.sub.2 .multidot.N.sub.2)/( Mb.sub.1 .multidot.N.sub.1) of a product of a bending rigidity Mb.sub.2 per steel cord of the lower belt layer (B) and the number N.sub.2 of the steel cords per unit width of the lower belt layer (B) to a product of a bending rigidity Mb.sub.1 per steel cord of the upper belt layer (A) and the number N.sub.1 of the steel cords per unit width of the upper belt layer (A) is set to be at a range of 0.2 to 0.65.
摘要翻译：在重型充气子午线轮胎中，在左右胎圈部之间设置至少一个胎体层，在胎体的外周配置有由断裂伸长率为4％以下的钢帘线形成的至少两个带束层层在胎面部分。带层由至少一个上带束层（A）和至少一个下带束层（B）组成。上带束层（A）的带宽度为轮胎部分胎体层的胎体线最大宽度SW的0.6倍以下，下带束层（B）的带宽度使其两端部延伸胎肩部分。下带束层（B）的钢帘线相对于轮胎周向的倾斜角度被设定为大于上带束层（A）的倾斜角度。下带束层（B）的每根钢丝帘线的弯曲刚度Mb2与下带束层（B）的每单位宽度的钢帘线数N2的乘积的比（Mb2xN2）/（Mb1xN1）上带束层（A）的每根钢帘线的弯曲刚度Mb1和上带束层（A）的每单位宽度的钢帘线的数量N1被设定为0.2〜0.65的范围。

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