Dynamic torque characteristics of the band brake of a continuous automatic transmission

LI Fei; SONG Jian; FANG Shengnan; LU Zhenghong; NGUYEN Truong Sinh

doi:10.16511/j.cnki.qhdxxb.2019.22.025

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Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (2) : 124-131. DOI: 10.16511/j.cnki.qhdxxb.2019.22.025

SPECIAL SECTION: ELECTRIC VEHICLE

Dynamic torque characteristics of the band brake of a continuous automatic transmission

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Abstract

A band brake is the shift actuator in a continuous automatic transmission with the band brake dynamics significantly influencing the shift quality. A static model, a finite element model and tests were used to investigate the relationship between the brake torque and the braking force. Tests of a brake drum rotated clockwise and counterclockwise were compared with simulations. The results show that the dynamic braking torque is related to the rotational speed, normal force and dynamic friction coefficient. When the brake drum is rotated forward, the self-energy effect increases the braking torque generated by the brake band with a longer static zone and better braking stability. When the drum is reversed, there is no obvious static zone, while the relationship is more linear and suitable for control. The test results are used to define the control parameters of the empirical equation for the dynamic brake band braking torque for smooth control of the brake band.

Key words

band brake / brake band / dynamic torque characteristics / continuous automatic transmission

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LI Fei, SONG Jian, FANG Shengnan, LU Zhenghong, NGUYEN Truong Sinh. Dynamic torque characteristics of the band brake of a continuous automatic transmission[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(2): 124-131 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.025

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