Please wait a minute...
浙江大学学报(工学版)
J4  2011, Vol. 45 Issue (4): 708-713    DOI: 10.3785/j.issn.1008-973X.2011.04.020
    
Drag torque prediction model of wet multi-disk shifting clutch
ZHANG Zhi-gang1, ZHOU Xiao-jun1, LI Yong-jun2, SHEN Lu1, YANG Fu-chun1
1. Institute of Modern Manufacturing Engineering, Zhejiang University, Hangzhou 310027, China; 2. National Key
Laboratory of Vehicle Transmission, China North Vehicle Research Institute, Beijing 100072, China
Download:   PDF(0KB) HTML
Export: BibTeX | EndNote (RIS)      

Abstract  

 A new prediction model was presented to predict the drag torque of a disengaged wet clutch in order to analyze the formation mechanism of drag torque of wet multi-disk shifting clutch. A radial velocity model of the oil film was deduced according to the Navier-Stokes equation based on laminar flow of viscosity hydrodynamics and considering the centrifugal effect of cooling and lubricating oil film in clearance. Then the radial velocity was analyzed. Results showed that the centrifugal force caused the shrinking of oil film. The equivalent outer radius was introduced to describe the phenomenon, and was resolved by utilizing the effect of surface tension of oil film. A new model was derived by combining the equivalent outer radius with the Newton inner friction law. The correctness and effectiveness of the new model were verified by test data and traditional model.

Published: 05 May 2011
CLC:  U 463.211  
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
Cite this article:

ZHANG Zhi-gang, ZHOU Xiao-jun, LI Yong-jun, SHEN Lu, YANG Fu-chun. Drag torque prediction model of wet multi-disk shifting clutch. J4, 2011, 45(4): 708-713.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2011.04.020     OR     http://www.zjujournals.com/eng/Y2011/V45/I4/708


湿式多片换档离合器带排转矩的预测模型

为了研究湿式多片换档离合器带排转矩的形成机理,建立湿式离合器的带排转矩预测模型.根据黏性流体力学中层流理论的Navier-Stokes方程,考虑到分离间隙中冷却润滑油膜的离心惯性作用,推导油膜的径向速度模型.通过对径向速度的仿真分析,揭示离心惯性力会使油膜产生收缩的现象.为了描述这一现象引入等效外径的概念,利用油膜的表面张力作用求出等效外径.将等效外径应用于牛顿内摩擦定律推导新的预测模型,通过试验数据和传统模型验证了新模型的正确性和有效性.

［1］ 贾云海,张文明.湿式摩擦离合器摩擦片表面温升和油槽结构研究［J］.中国公路学报,2007,20(5): 112-116.
JIA Yunhai, ZHANG Wenming. Research on friction disk surface oil groove configuration and temperature raise in wet friction clutch ［J］. China Journal of Highway and Transport, 2007, 20(5): 112-116.
［2］ YUAN Y Q, EYSION A L, JAMES H. An improved hydrodynamic model for open wet transmission clutches ［J］. Journal of Fluids Engineering, 2007, 27(3): 333-337.
［3］ FREDERICK A L. Parameters contributing to power loss in disengaged wet clutches ［J］. SAE Transactions, 1974, 83(9): 1026-1032.
［4］ ROBERT L F. Using the SAE#2 machine to evaluate wet clutch drag losses ［J］. SAE Transactions, 1991, 100(2): 518-525.
［5］ HISANAO K, CHEN Y L, HENRY H. Analysis of the various factors affecting drag torque in multiple plate wet clutches ［J］. SAE Transactions, 2003, 112(5):1840-1845.
［6］ KATO Y, MURASUGI T, HIRAKI H, et al. Fuel economy improvement through tribological analysis of the wet clutches and brakes of an automatic transmission ［J］. JSAE Transactions, 1993, 58(10): 196-201.
［7］ APHALE C R, CHO J, SCHULTZ W W, et al. Modeling and parametric study of torque in open clutch plates ［J］. Journal of Tribology, 2006, 128(4): 422-430.
［8］ YUAN Y Q, ATTIBELE P, DONG Y. CFD simulation of the flows within disengaged wet clutches of an automatic transmission ［J］. SAE Transactions, 2003, 56(3): 1760-1768.
［9］ 马彪,杨文正,周凯.液压换档离合器带排转矩研究［J］.机械设计,1999,17(10):13-15.
MA Biao, YANG Wenzheng, ZHOU Kai. A study on drag torque of hydraulic shift clutch ［J］. Machine Design, 1999, 17(10): 13-15.
［10］ 阎清东,李宏才.湿式多片制动器带排转矩研究［J］.机械,2001,28(6): 73-75.
YAN Qingdong, LI Hongcai. Study on drag torque of wet multidisc brake ［J］. Machinery, 2001, 28(6): 73-75.
［11］ 刘建胜,陈东升,李宏才.湿式多片式制动器带排转矩和响应特性的试验研究［J］.车辆与传动技术,2003, 22(4): 8-11.
LIU Jiansheng, CHEN Dongsheng, LI Hongcai. Experiment research on drag torque and response characteristic of wet multidisc brake ［J］. Vehicle and Power Technology, 2003, 22(4): 8-11.
［12］ HU J B, PENG Z X, YUAN S H. Drag torque prediction model for the wet clutches ［J］. Chinese Journal of Mechanical Engineering, 2009, 22(2): 238-243.
［13］ 常近时.环形油垫静压推力轴承考虑油流惯性的承载能力计算公式［J］.机械工程学报,1982,18(1): 62-68.
CHANG Jinshi. A calculation formula for carrying capacity of annular hydrostatic stepbearing taking account of oilflow inertia ［J］. Journal of Mechanical Engineering, 1982, 18(1): 62-68.
No related articles found!