The design of 195/70R15 12PR all-steel radial tire was described.In the structural design,the following parameters were taken:overall diameter 651 mm,cross-section width 207 mm,width of running surface 150 mm,arc height of running surface 6.7 mm,bead diameter at rim seat 379 mm,bead width at rim seat 178 mm,maximum width position of cross-section(H1/H2)0.942 9,4 grooves with variable pitch longitudinal pattern for tread,drainage type sipes on pattern blocks,pattern depth 8.5 mm,block/total ratio 71.4％,number of pattern pitches 30.In the construction design,the following processes were taken:four composite design for tread,three co-extrusion for sidewall,3+8X0.23HT steel cord for 1# and 2# belts,2-layer crown ply using electronic pre-vulcanized 1670dtex/2 DSP polyester cord with 0° winding,3X0.22/9X0.20 CCHT steel cord for carcass,using two stage building machine to build tire with crown wrapping side process and hot plate vulcanization press to cure tire with superheated water vulcanization process.The performance test results of finished tires showed that the inflated peripheral dimension,strength,durability,high-speed performance,bead performance,and grounding mark met the requirements of corresponding design and national standards.
NETL
NSTL
万方数据
