根据机床主传动的要求，宽三角带无级变速器的加压弹簧座位于主动轮。实验证明：这样布置满载时效率较高。本文推导了主动轮轴向力计算公式，并介绍了凸轮加压装置。由于该装置能随负载扭矩的大小自动调节轴向压力，解决了弹簧加压变速器低负载低效率问题．实验结果是满意的。 According to the requirements of the main drive of the machine tool, the wide-belt pressure spring seat with continuously variable transmission is located on the driving wheel. Experiments show that: this arrangement full load efficiency. This paper deduces the formula of the driving wheel axial force, and introduces the cam pressure device. Since the device can automatically adjust the axial pressure with the magnitude of the load torque, the problem of low load and low efficiency of the spring-loaded transmission is solved. The experimental results are satisfactory.