干片式制动器弹子加压装置的力传递效率研究
Force Transmission Analysis for the Marbles Screw Loading Device of Dry Disc Brakes

针对弹子加压装置输出力损失严重的问题，从弹子加压装置的摩擦与偏载方面出发，建立了一种弹子加压装置的力传递计算模型.基于弹子加压装置的结构特点和运动特点，依据库伦摩擦定理和赫兹接触理论分析量化摩擦和偏载对装置输出力的影响，并依据装置的拟静平衡方程，得出了弹子加压装置的力传递效率计算公式，同时对公式中的相关参数进行讨论.结果表明：装置滚珠处摩擦阻力会严重影响弹子加压装置的力传递性能、装置中弹子槽最优螺旋角为19.88°、调整弹子槽与弹子的匹配尺寸可以改善弹子的传力特性.
To study the output load loss mechanism of the marbles screw loading device, a force transmission model was established emphatically on frictions and unbalanced loads. Based on the structure and motion characteristics of the device, the impact of frictions and unbalanced loads on the device output was analyzed with Coulomb friction law and Hertz contact theory. The force transmission efficiency formula was deduced from the quasi-static equation of the device. Meanwhile, the relevant parameters in formula were discussed. The results show that the friction at the ball groove seriously affects the force transmission performance, the optimum helix angle of the device is 19.88°, and the matching size of the ball groove and the marble can be adjusted to improve the force transmission characteristics of the bullet