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浙江大学学报(工学版)  2019, Vol. 53 Issue (7): 1225-1236    DOI: 10.3785/j.issn.1008-973X.2019.07.001
机械与能源工程     
含沟槽湿式离合器接合特性数值与试验研究
杨辰龙(),吴鹏辉(),商晓波,王赵帅
浙江大学 机械工程学院,浙江 杭州 310027
Simulation and experimental study of engagement process with groove consideration
Chen-long YANG(),Peng-hui WU(),Xiao-bo SHANG,Zhao-shuai WANG
College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
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摘要:

为了研究工况参数对湿式离合器接合特性的影响规律,基于Navier-Stokes方程、KE粗糙接触理论和传热理论,针对含沟槽湿式离合器建立接合特性综合数值模型. 利用自主研制的离合器试验装置,针对接合压力、润滑油(ATF)温度、相对转速、渗透性和沟槽等影响因素进行正交试验. 结果表明,接合压力不仅影响接合时间且对扭矩有影响,压盘接触瞬间的扭矩抖动取决于接合压力稳定性,接合完成瞬间的扭矩抖动是由动静摩擦系数差异造成的;润滑油温升高,黏度降低使粗糙峰接触延迟造成接合时间增长,接合扭矩减小;转速越高,接合时间越长;渗透性越高,油膜厚度下降越快,接合响应速度越快;沟槽宽度越大,接合扭矩的幅值越小,接合时间越长. 初始油膜厚度越大,接合初始阶段的油膜剪切扭矩越小.

关键词: 湿式离合器接合特性粗糙接触传热扭矩抖动    
Abstract:

A comprehensive numerical model was established based on the Navier-Stokes equations, KE rough contact mechanics and heat transfer theory with grooves consideration in order to analyze the effect of the operating conditions on the engagement behavior of wet clutches. The orthogonal experiments were conducted to analyze the effect of the operating parameters such as applied pressure, the temperature of automatic transmission fluid (ATF), the relative rotation speed, the permeability and the grooves based on the independently developed experimental setup. Results show that the applied pressure not only affects the engagement time, but also the engagement torque. The first torque judder that appears at the moment of the piston touching the plates depends on the stability of the applied pressure. The second torque judder that appears at the end of the engagement process is caused by the difference of dynamic and static friction coefficient. The increase of the temperature of ATF makes the dynamic viscosity decrease, which delays the rough contact and engagement process. The hydraulic torque decreases accordingly. The higher the relative rotation speed is, the longer the engagement time is. The higher the permeability of the friction material is, the faster the decrease of the film thickness and the engagement response is. The larger the groove width is, the smaller the engagement torque is, the longer the engagement time is. The larger the initial film thickness is, the smaller the shearing torque is.

Key words: wet clutch    engagement behavior    rough contact    heat transfer    torque judder
收稿日期: 2018-06-22 出版日期: 2019-06-25
CLC:  U 463  
作者简介: 杨辰龙(1974—),男,副教授,从事先进测试技术研究. orcid.org/0000-0001-8720-5575. E-mail: yclzju@163.com
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引用本文:

杨辰龙,吴鹏辉,商晓波,王赵帅. 含沟槽湿式离合器接合特性数值与试验研究[J]. 浙江大学学报(工学版), 2019, 53(7): 1225-1236.

Chen-long YANG,Peng-hui WU,Xiao-bo SHANG,Zhao-shuai WANG. Simulation and experimental study of engagement process with groove consideration. Journal of ZheJiang University (Engineering Science), 2019, 53(7): 1225-1236.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.07.001        http://www.zjujournals.com/eng/CN/Y2019/V53/I7/1225

图 1  湿式离合器的结构示意图
图 2  平均油膜厚度示意图
图 3  摩擦片表面粗糙接触分析模型
图 4  湿式离合器径向沟槽示意图
参数 数值 参数 数值
${R_{\rm{i}}}$ 0.378 m ${E_2}$ 2.06×109 MPa
${R_{\rm{o}}}$ 0.421 m ${\nu _1}$ 0.3
$d$ 0.5 mm ${\nu _2}$ 0.4
${E_1}$ 1.059×108 MPa
表 1  大尺寸湿式离合器摩擦元件试验件参数表
参数 数值 参数 数值
$\mu $ 0.086 Pa·s B 0.2 mm
${h_{\rm{o}}}$ 2.54×10-5 ${\sigma _{\rm{s}}}$ 1.012×10-6
${h_{\rm{g}}}$ 4×10-4 ${\sigma _{\rm{f}}}$ 8.32×10-6
$\rho $ 850 kg/m3
表 2  湿式离合器动态接合仿真及试验运行工况参数表
图 5  红外温度传感器测试方法
图 6  湿式离合器接合过程温度变化试验曲线
图 7  湿式离合器接合过程中的温度变化仿真曲线
图 8  湿式离合器接合特性自动化试验系统
图 9  湿式离合器自动化试验系统原理示意图
图 10  湿式离合器冷却润滑系统
图 11  湿式离合器接合压力试验曲线(1.1、1.3和1.5 MPa)
图 12  不同压力下的接合特性仿真曲线(1.1、1.3和1.5 MPa)
图 13  不同稳定接合压力下的接合过程试验曲线(1.1、1.3和1.5 MPa)
图 14  不同PID参数下的接合过程试验曲线
图 15  稳定接合压力与接合扭矩关系的试验曲线
图 16  不同润滑油温度下的接合过程仿真曲线(65、50和35 °C)
图 17  不同润滑油温度下的接合过程试验曲线(65、50和35 °C)
图 18  不同初始转速接合过程压力试验曲线
图 19  不同初始转速下的接合扭矩变化仿真曲线
图 20  不同初始转速下的接合扭矩变化试验曲线
图 21  不同初始转速下的瞬时滑摩功率试验曲线
图 22  不同渗透性参数下的油膜变化仿真曲线
图 23  不同渗透参数接合扭矩仿真曲线
图 24  不同渗透参数接合扭矩试验曲线
图 25  不同沟槽宽度下的接合扭矩仿真曲线
图 26  不同沟槽宽度下的接合特性试验曲线
图 27  定间隙下油膜剪切力形成黏性扭矩试验曲线
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