引言 Introduction
轮胎按胎体帘线排列方式进行结构分类，主要分为斜交线轮胎和子午线轮胎两大类。目前全球乘用车市场已基本实现子午线轮胎的全面普及，商用车市场也正加速向子午线轮胎转型。
Classification of tyres by the arrangement of carcass cords, mainly divided into two categories: bias tyres and radial tyres. At present, the global passenger car market has basically achieved full popularization of radial tyres, and the commercial vehicle market is also accelerating the transformation to radial tyres.
一、斜交线轮胎 Bias Tyres
斜交线轮胎（Bias Tyre），又称尼龙胎（Nylon Tyre），是采用传统交叉帘线结构的轮胎。其胎体帘布层按照与轮胎周向呈 30°–40° 的角度交叉排列，相邻两层帘线的方向相互垂直，形成网状结构。
Bias tyres, also known as nylon tyres, are tyres adopting the traditional cross cord structure. Their carcass plies are arranged crosswise at an angle of 30°–40° to the tyre circumference, and the directions of adjacent two plies are perpendicular to each other, forming a mesh structure.
斜交线轮胎的制造工艺历史悠久，技术门槛较低，生产成本相对低廉。然而，其结构固有缺陷导致性能存在明显不足：承载能力有限、耐磨性差、地面抓地力弱、滚动阻力大导致燃油消耗高，且胎侧刚性大导致乘坐舒适性差。随着子午线轮胎技术的不断成熟和成本下降，斜交线轮胎正在逐步被全球市场淘汰，目前仅在部分低速、重载的工程机械和农业机械领域还有少量应用。
Bias tyres have a long manufacturing history, low technical threshold and relatively low production cost. However, their inherent structural defects lead to obvious performance deficiencies: limited load capacity, poor wear resistance, weak road grip, high rolling resistance resulting in high fuel consumption, and high sidewall rigidity leading to poor ride comfort. With the continuous maturity and cost reduction of radial tyre technology, bias tyres are gradually being eliminated from the global market, and currently only have a small number of applications in some low-speed, heavy-duty construction machinery and agricultural machinery fields.
二、子午线轮胎 Radial Tyres
子午线轮胎（Radial Tyre）是现代轮胎技术的主流产品。其胎体帘线排列方向与地球子午线相似，以轮轴为中心，从一个胎圈到另一个胎圈呈放射状排列，与轮胎周向呈 90° 角。胎体上方设置有多层刚性带束层，箍紧胎体，共同承受车辆负载和行驶应力。
Radial tyres are the mainstream product of modern tyre technology. Their carcass cords are arranged in a direction similar to the Earth's meridians, radiating from one bead to the other with the wheel axle as the center, at a 90° angle to the tyre circumference. Multiple rigid belt layers are arranged above the carcass to tighten the carcass and jointly bear the vehicle load and driving stress.
根据胎体和带束层使用材料的不同，子午线轮胎又分为全钢子午线轮胎和半钢子午线轮胎：
According to the materials used in the carcass and belt layers, radial tyres are further divided into all-steel radial tyres and semi-steel radial tyres:
1. 全钢子午线轮胎 All-Steel Radial Tyre
全钢子午线轮胎（All-Steel Radial Tyre）：胎体和带束层均采用高强度钢丝帘线，俗称"全钢胎"。主要应用于重型卡车、客车、工程机械等商用车领域，具有极高的承载能力和耐久性。
All-Steel Radial Tyres: Both the carcass and belt layers adopt high-strength steel cords, commonly known as "all-steel tyres". They are mainly used in commercial vehicle fields such as heavy trucks, buses and construction machinery, and have extremely high load capacity and durability.
2. 半钢子午线轮胎 Semi-Steel Radial Tyre
半钢子午线轮胎（Semi-Steel Radial Tyre）：胎体采用聚酯或尼龙等纤维帘线，带束层采用钢丝帘线，俗称"半钢胎"。主要应用于乘用车、SUV 和轻型卡车领域，兼顾舒适性和操控性。
Semi-Steel Radial Tyres: The carcass adopts fiber cords such as polyester or nylon, and the belt layer adopts steel cords, commonly known as "semi-steel tyres". They are mainly used in passenger cars, SUVs and light trucks, balancing comfort and handling.
世界上第一条子午线轮胎由法国米其林公司于 1948 年发明。与传统斜交线轮胎相比，子午线轮胎在舒适性、承载能力、燃油经济性和操控性等方面具有全面优势，目前已成为全球轮胎行业的发展主流。
The world's first radial tyre was invented by the French company Michelin in 1948. Compared with traditional bias tyres, radial tyres have comprehensive advantages in comfort, load capacity, fuel economy and handling, and have now become the mainstream of development in the global tyre industry.
三、子午线轮胎的优越性 Advantages of Radial Tyres
1. 耐磨性好，行驶里程长 Excellent Wear Resistance and Long Service Life
与斜交胎相比，子午线轮胎胎冠周向变形小、花纹块滑移量少，胎面摩擦生热低。同时，其接地面积更大，单位压力更小且分布更均匀，因此耐磨性能和行驶里程显著优于斜交轮胎。试验数据表明，全钢丝载重子午线轮胎的行驶里程比斜交胎提高 80%–100%。
Compared with bias tyres, radial tyres have smaller circumferential deformation of the crown, less slippage of tread blocks, and lower frictional heat generation of the tread. At the same time, their contact area is larger, the unit pressure is smaller and more evenly distributed, so their wear resistance and service life are significantly better than those of bias tyres. Test data shows that the service life of all-steel heavy-duty radial tyres is 80%–100% higher than that of bias tyres.
2. 滚动阻力小，燃油消耗低 Low Rolling Resistance and Low Fuel Consumption
汽车燃料消耗是交通运输成本的最大组成部分，而轮胎滚动阻力是影响汽车油耗的重要因素之一。子午线轮胎的滚动阻力一般比斜交胎低 20%–30%，滑行距离比斜交胎大 35% 左右。行业数据显示，轮胎滚动阻力每降低 5%，可降低汽车油耗约 1%。因此，使用子午线轮胎是降低车辆运营成本的有效措施。
Automotive fuel consumption is the largest component of transportation costs, and tyre rolling resistance is one of the important factors affecting vehicle fuel consumption. The rolling resistance of radial tyres is generally 20%–30% lower than that of bias tyres, and the coasting distance is about 35% longer. Industry data shows that every 5% reduction in tyre rolling resistance can reduce vehicle fuel consumption by about 1%. Therefore, using radial tyres is an effective measure to reduce vehicle operating costs.
3. 生热低，高速安全性好 Low Heat Generation and Good High-Speed Safety
轮胎生热和热破坏是高速行驶条件下轮胎损坏的主要原因之一。在相同行驶条件下，斜交胎的行驶温度比子午胎高约 30℃。随着全球高速公路网络的不断完善，子午线轮胎的高速安全优势愈发明显。
Tyre heat generation and thermal damage are one of the main causes of tyre damage under high-speed driving conditions. Under the same driving conditions, the operating temperature of bias tyres is about 30°C higher than that of radial tyres. With the continuous improvement of the global highway network, the high-speed safety advantage of radial tyres has become increasingly obvious.
以中国沈大高速公路为例，该公路通车初期，装用斜交胎的客运班车从沈阳到鞍山（100 公里）后必须休息半小时以上，否则返回途中有 20%–30% 的轮胎会出现脱空、爆破问题；而装用子午线轮胎的车辆可连续行驶，一天往返四次也不会发生此类故障。载重斜交胎的最高设计速度一般不超过 90km/h，而载重子午线轮胎的最高设计速度可达 110–130km/h。
Taking the Shenyang-Dalian Expressway in China as an example, in the early days of its opening, passenger buses equipped with bias tyres had to rest for more than half an hour after traveling from Shenyang to Anshan (100 km), otherwise 20%–30% of the tyres would experience delamination and blowout on the return trip; while vehicles equipped with radial tyres could drive continuously, making four round trips a day without such failures. The maximum design speed of heavy-duty bias tyres is generally no more than 90 km/h, while that of heavy-duty radial tyres can reach 110–130 km/h.
4. 减震性能好，乘坐舒适 Good Shock Absorption and Comfortable Ride
子午线轮胎的胎体结构更加柔软，具有优异的缓冲和减震效果，能够有效吸收路面不平产生的振动，显著提升车辆的乘坐舒适性。同时，得益于刚性带束层的箍紧作用，轮胎在高速转弯和颠簸路面上仍能保持胎面接地形状的稳定，兼顾了柔软缓冲与操控刚性之间的平衡。
The radial tyre's carcass structure is more flexible, offering excellent cushioning and shock absorption that effectively absorbs vibrations from uneven road surfaces, significantly improving ride comfort. At the same time, thanks to the tightening effect of the rigid belt layers, the tyre maintains a stable tread contact shape during high-speed cornering and on rough roads, striking a balance between soft cushioning and handling rigidity.
