离合器的相关计算.ppt

Simulation & design tools 仿真及设计工具Clutch calculation 离合器计算Property of Valeo - Reproduction prohibitedClutch calculation离合器计算nClamp load calculationèCOEF test techniqueèRange lawsèClutch torquenThermal adaptationèStart-up energyèDecision table & curvesnLife time calculationèWear test techniquesèCalculation coden工作压力计算èCOEF试验技术è范围确定的原则è离合器扭矩n热能的匹配è启动的能量è判定表及曲线n寿命的计算è磨损试验的技术è计算规则3Clamp load calculation 工作压力计算Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Clutch torque capacity离合器传扭能力Calculation of the clutch maximum torque capacity 离合器最大传扭能力计算离合器传递扭矩压紧载荷摩擦系数作用半径摩擦面数目5Property of Valeo - Reproduction prohibitedInertia 惯量Test Clutch 试验离合器Electrical Motor 电机Rating and analysis of friction coefficient Wear rating and analysis Analysis of thermal clutch issueClamp load calculation工作压力计算 COEFF test technique COEFF 实验方法定义和分析摩擦系数定义和分析磨损分析离合器热能结果6Property of Valeo - Reproduction prohibitedTest cycle 试验次数Clamp load calculation工作压力计算 COEFF test technique COEF 试验技术7Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 COEFF test technique COEF试验计算n3 energy levels èBasic Energy Level (BEL)Energy is sufficient to induce enough wear in a short period of timeèMedium Energy Level (MEL)Average energy between BEL and HELèHigh Energy Level (HEL)Hard duty cycle but remaining non-destructiven2 temperature levels è80 and 200°C .n3种能量水平è基本的能量水平(BEL)在短期内吸收由于磨损产生足 够的能量è中等能量水平(MEL)处于基本和高的之间è高的能量水平(HEL)在恶劣的条件下循环但是没有 破坏n2个温度水平è80和200°C.8Property of Valeo - Reproduction prohibitedNon rotating parts不旋转部件Rotating parts旋转部件Inertia惯量Brake clutch 制动离合器E – Engine电机Torquemeter扭矩仪Clamp load calculation工作压力计算 COEFF test technique COEFF试验技术Step 1Step 2Step 3Step 4Step 5Step 6 Step 7250 cycles1000 cycles250 cycles1000 cycles750 cycles250 cycles1000 cycles 80°C200°C80°C200°C200°C80°C200°C BELBELMELMELHELBELBEL9Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Torque measurement 扭矩测量OD: Outer diameter of facing摩擦片外径 ID:Inner diameter of facing摩擦片内径扭矩:Nm摩擦系数计算压紧力摩擦片面数摩擦片外径摩擦片内径平均扭矩10Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Measurement of the friction coefficient µ 测量摩擦系数 µ nFor a step : Friction coefficient µ “mini courant” definition对每一阶段:记录发现最小的摩擦系数nFor the test : Friction coefficient µ “mini courant” definition对试验:记录发现最小的摩擦系数èMinimal value of the µ « mini courant » of all the steps 所有的阶段中最小值的µ 11Property of Valeo - Reproduction prohibitednFriction coefficient value for clamp load calculation用摩擦系数对工作压力进行评价Clamp load calculation工作压力计算 Measurement of the friction coefficient µ 测量摩擦系数 µ 摩擦系数计算用摩擦系数(平均值- 10%Μ平均值12Property of Valeo - Reproduction prohibitedCalculation of the clutch maximum torque capacity 离合器最大传扭能力计算Clamp load calculation工作压力计算 Clutch maximum torque capacity离合器的最大传扭能力离合器传递扭矩压紧载荷摩擦系数作用半径摩擦面数目离合器比率预载荷：轴承预载荷没有轴承预载荷:有轴承预载荷:13Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Clutch maximum torque capacity离合器最大传扭能力最大发动机扭矩安全系数(后备 )最大传扭能力离合器最大传扭能力压紧载荷14Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Energy levels方法能量水平nThe question is how to determine energy levels in order to have consistent test results vs. clutch sizes èThe answer is a range logic built on :èfacing surface vs. size lawèpressure plate mass vs. size lawèpressure plate mass vs. engine power lawèenergy lawn针对离合器尺寸问题在于如何确定能量的水平使得与试验结果一致è回答建立在逻辑推理的上è摩擦片表面与尺寸原则è压盘质量与尺寸原则è压盘质量与发动机功率的原则è能量原则15Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Facing surface vs. size law摩擦片表面与尺寸的规律16Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Pressure plate mass vs. size law压盘质量与尺寸的规律17Property of Valeo - Reproduction prohibitedDq=KEST..1Clamp load calculation工作压力计算 Surface temperature 表面温度nSurface temperature formula表面温度公式18Property of Valeo - Reproduction prohibitedCfE S e=(,)1nConical strain vs. energy and thickness锥型变形与能量和厚度Clamp load calculation工作压力计算 Conical strains锥型变形19Property of Valeo - Reproduction prohibited00.10.20.30.40.50.60.7050100150200250300350400Energy in kJConicity in mmThickness 15 mmThickness 26 mmThickness 28mm138 kJ HEL size 250237 kJ HEL size 350315 kJ HEL size 430nFinite element method results有限元计算的结果 nEnergy dissipated in 3 seconds 能量分为3档Clamp load calculation工作压力计算 Energy law能量规律20Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Energy law能量规律21Property of Valeo - Reproduction prohibitedClamp load calculation工作压力计算 Thermal flux law热能变化规律22Property of Valeo - Reproduction prohibitedExample of clamp load calculation 工作压力计算的例子23Thermal adaptation 热能匹配Property of Valeo - Reproduction prohibitedEMR M CRF= -+1 2111222..... ((. ...(sin()))d dwrg ra mr: Energy dissipated in the clutch (J)离合器能量分布E: Vehicle mass (kg)整车质量M: Tire radius (m)轮胎半径R: Axle and gear box ratio主传动比与变速器速比d: Earth gravity 重力加速度g: Maximum torque最大扭矩Cm: Rolling drag (0.015)转动摩擦系数FrEngine speed @ maximum torque (Rd/s)最大输出扭矩下发动机转速 :/ω: Road slope (rad)道路的坡度α: Transmission yield传递效率ρThermal adapt。