Dynamic braking torque characteristics of a band brake

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

doi:10.16511/j.cnki.qhdxxb.2020.21.005

PDF(8319 KB)

Journal of Tsinghua University(Science and Technology) ›› 2020, Vol. 60 ›› Issue (11) : 887-894. DOI: 10.16511/j.cnki.qhdxxb.2020.21.005

AUTOMOTIVE ENGINEERING

Dynamic braking torque characteristics of a band brake

{{article.zuoZhe_EN}}

Author information +

History +

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.

Key words

band brake / brake band / dynamic braking torque characteristics

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

LI Fei, SONG Jian, FANG Shengnan, LU Zhenghong, NGUYEN Truong Sinh. Dynamic braking torque characteristics of a band brake[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(11): 887-894 https://doi.org/10.16511/j.cnki.qhdxxb.2020.21.005

References

[1] 宋健, 李飞, 李锐, 等. 一种复合轮系动力保持型三挡自动变速器:ZL201510228009.2[P]. 2015-05-07. SONG J, LI F, LI R, et al. 3 speed uninterrupted powertrain automatic mechanical transmission based on composite wheel train:ZL201510228009.2[P]. 2015-05-07. (in Chinese)
[2] 胡甫才, 向阳, 杨建国. 锚绞机带式制动器热-结构耦合分析[J]. 船舶工程, 2009, 31(3):27-30. HU F C, XIANG Y, YANG J G. Analysis of the thermal-structure coupling of the band brake of anchor and mooring equipment[J]. Ship Engineering, 2009, 31(3):27-30. (in Chinese)
[3] LUBRIZOL C. Design practices passenger car automatic transmissions 4th ed[M]. New York, USA:SAE International, 2012.
[4] GU X M, TAKABAYASHI H, FUJⅡ T. Latest technologies applied to automatic transmission maji-band[C]//2006 SAE World Congress. Detroit, Michigan, USA:SAE, 2006, 4:1-356.
[5] 王玉海.拟人式自动变速系统控制方法研究与控制器开发[D].北京:清华大学, 2005. WANG Y H. Research on artificial control strategy for automated mechanical transmission and controller design[D]. Beijing:Tsinghua University, 2005. (in Chinese)
[6] ZHENG Q.Modeling and control of powertrains with stepped automatic transmissions[D].Columbus, USA:The Ohio State University, 1999.
[7] 温诗铸.摩擦学原理[M]. 北京:清华大学出版社, 1990. WEN S Z. Tribology principle[M]. Beijing:Tsinghua University Press, 1990. (in Chinese)
[8] 吕俊成. 微型汽车离合器摩擦学性能及其应用研究[D]. 武汉:武汉理工大学, 2009. LÜ J C. Research on the tribology performance and application of micro-automobile clutch[D]. Wuhan:Wuhan University of Technology, 2009. (in Chinese)
[9] JANKOWIAK T, RUSINEK A, LIST G, et al. Numerical analysis for optimizing the determination of dynamic friction coefficient[J]. Tribology International, 2016(95):86-94.
[10] YIN Y, BAO J S, XIAO X M, et al. Objective characterization on the dynamic friction coefficient of disc brake[J]. Tribology Transactions, 2016, 59(6):1122-1133.
[11] FUJⅡ Y, TOBLER W E, SNYDER T D. Prediction of wet band brake dynamic engagement behavior part 1:Mathematical model development[J]. Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2001, 215(4):479-492
[12] FUJⅡ Y, TOBLER W E, SNYDER T D. Prediction of wet band brake dynamic engagement behavior part 2:Mathematical model development[J]. Proceedings of the Institution of Mechanical Engineers, Part D:Journal of Automobile Engineering, 2001, 215(4):603-611.
[13] 李飞, 宋健, 方圣楠, 等. 动力保持型AMT带式制动器的动态力矩特性[J].清华大学学报(自然科学版), 2020, 60(2):124-131. LI F, SONG J, FANG S N, et al. Research om dynamic torque characteristics of band brake of uninterrupted powertrain AMT[J]. Journal of Tsinghua University (Science and Technology), 2020, 60(2):124-131. (in Chinese)
[14] 余志生. 汽车理论[M]. 5版. 北京:机械工业出版社, 2009. YU Z S. Theory of automobile[M]. 5th ed. Beijing:China Machine Press, 2009. (in Chinese)