Dynamic braking torque characteristics of a band brake
LI Fei1,2, SONG Jian1, FANG Shengnan1, LU Zhenghong1, NGUYEN Truong Sinh1
1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China; 2. Department of Mechanized Infantry, Shijiazhuang School of Army Infantry Academy, Shijiazhuang 050083, China
Abstract：Band brakes are used as shift actuators in uninterrupted powertrain automatic mechanical transmissions (AMT). The dynamic characteristics of the brake band then strongly affect the shift quality. The dynamic torque characteristics of a band brake were studied using a finite element model of the band brake with experimental tests for various working conditions. The results show that the dynamic braking torque is not only related to the brake drum speed, braking force, and braking force radius, but also depends on the braking force loading speed. When the other conditions are kept the same, a faster braking force loading leads to a smaller braking torque on the band. The effect was described using a qualitative analysis of the hydrodynamic lift force. The results were used to define an equivalent dynamic friction coefficient, an equivalent torque input coefficient and a compensation coefficient with an empirical equation for the dynamic braking torque that integrates the braking force loading speed into the dynamic braking torque.
李飞, 宋健, 方圣楠, 卢正弘, NGUYEN Truong Sinh. 带式制动器动态制动力矩特性[J]. 清华大学学报（自然科学版）, 2020, 60(11): 887-894.
LI Fei, SONG Jian, FANG Shengnan, LU Zhenghong, NGUYEN Truong Sinh. Dynamic braking torque characteristics of a band brake. Journal of Tsinghua University(Science and Technology), 2020, 60(11): 887-894.
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2020, Vol. 60 
