A power transmission fluid composition having improved characteristics. The fluid may comprise a base oil and an additive composition including a viscosity index improving amount of a polyisoalkylene component having a molecular weight ranging from about 300 to about 3000 weight average molecular weight as determined by gel permeation chromatography. The power transmission fluid exhibits a kinematic viscosity (KV at 100°C) of less than about 9 centistokes and a Brookfield viscosity (BV at -40°C) of less than about 30,000 centipoise. Also the friction versus velocity curve for the fluid has a more positive slope at high speeds compared to similar fluids in the absence of the polyisoalkylene component.
一种具有改进特性的动力传动液组合物。该传动液可由基础油和添加剂组合物组成,添加剂组合物包括可提高粘度指数的聚异
烷烃成分,经凝胶渗透色谱法测定,聚异
烷烃成分的分子量在约 300 到约 3000 重量平均分子量之间。动力传动液的运动粘度(KV,100°C 时)小于约 9 厘沲,Brookfield 粘度(BV,-40°C 时)小于约 30,000 厘泊。此外,与不含聚异
烷烃成分的类似传动液相比,该传动液的摩擦力与速度曲线在高速运转时具有更积极的斜率。