Dynamic braking torque characteristics of a band brake

doi:10.16511/j.cnki.qhdxxb.2020.21.005

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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.

Keywords band brake brake band dynamic braking torque characteristics

Issue Date: 31 August 2020

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	LI Fei
	SONG Jian
	FANG Shengnan
	LU Zhenghong
	NGUYEN Truong Sinh

Cite this article:

LI Fei,SONG Jian,FANG Shengnan, et al. Dynamic braking torque characteristics of a band brake[J]. Journal of Tsinghua University(Science and Technology), 2020, 60(11): 887-894.

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http://jst.tsinghuajournals.com/EN/10.16511/j.cnki.qhdxxb.2020.21.005 OR http://jst.tsinghuajournals.com/EN/Y2020/V60/I11/887

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