摘要
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.
引文
[1] 李福庆,刘昭度,付国锎,等.轿车盘式制动器渐进特性研究[J].北京理工大学学报,2008,38(7):581-584. Li Fuqing,Liu Zhaodu,Fu Guokai,et al.A study on brake torque asympototic characteristics for disc brakes[J].Transactions of Beijing Institute of Technology,2008,38(7):581-584.(in Chinese)
[2] Emam M A,Emam A S,El-Demerdash S M,et al.Performance of automotive self reinforcement brake system.Journal of Mechanical Engineering,2012(1):4-10.
[3] 王军年,张垚,王庆年,等.自增力液压楔形盘式制动器设计及效能仿真[J].汽车技术,2016(11):1-4. Zhang Junnian,Zhang Yao,Wang Qingnian,et al.Design and braking efficiency simulation for self-reinforcement hydraulic wedge disc brake[J].Automobile Technology,2016(11):1-4.(in Chinese)
[4] 陈文滨.弹子盘加压机构力传递性能研究[D].大连:大连海事大学,2015. Chen Wenbin.Research of force transmission performance of marbles disk pressing system[D].Dalian:Dalian Maritime University,2015.(in Chinese)
[5] 李传奇.多盘制动器加压装置典型结构设计及试验研究[D].锦州:辽宁工业大学,2016. Li Chuanqi.Typical structure design and experimental research of multi disc brake pressure mechanism[D].Jinzhou:Liaoning University of Technology,2016.(in Chinese)
[6] 兰海,杨玲玲,单伟刚.火焰喷涂镍-石墨涂层在弹子加压机构的应用[J].金属热处理,2013,38(10):74-78. Lan Hai,Yang Lingling,Shan Weigang.Application of Ni-C coating prepared by flame spraying technology in ball pressurizing mechanism[J].Heat Treatment of Metals,2013,38(10):74-78.(in Chinese)