Chapter 16 Vehicle automatic transmission 同©大学 TONGII UNIVERSTTY The working process of hydraulic coupler(for example) >Car starting >The engine crankshaft drives the impeller to rotate; >The turbine and drivetrain still are in a quiescent state. >The impeller drives the working fluid to do work to the turbine and engenders torque. >With the engine speed increasing,the torque is increased and overcomes the car starting resistance
Chapter 16 Vehicle automatic transmission The working process of hydraulic coupler (for example) Car starting The engine crankshaft drives the impeller to rotate; The turbine and drivetrain still are in a quiescent state. The impeller drives the working fluid to do work to the turbine and engenders torque. With the engine speed increasing, the torque is increased and overcomes the car starting resistance
Chapter 16 Vehicle automatic transmission 同©大学 The pros and cons of using hydraulic coupler in the car Advantage Disadvantage >The hydraulic coupler can only >It allows greater speed difference transfer torque without changing the between the impeller and the turbine, size,it must be used in conjunction with and can ensure a smooth start-up and the transmission mechanism; acceleration of the car; >It must add the clutch between >At the same time,damps the system coupling and transmission; overload caused by torsional vibration; >Increase the quality and size of the >Extend the driveline's working life transmission system; >When temporary parking,it may not >It exists losing of liquid flow,the be disengaged from the driveline,to efficient of the system is less than that of reduce the number of gear shifting. single clutch. >Currently,the application in the automotive is gradually reduced
Chapter 16 Vehicle automatic transmission The pros and cons of using hydraulic coupler in the car Advantage It allows greater speed difference between the impeller and the turbine, and can ensure a smooth start-up and acceleration of the car; At the same time ,damps the system overload caused by torsional vibration; Extend the driveline’s working life ; When temporary parking, it may not be disengaged from the driveline, to reduce the number of gear shifting. Currently, the application in the automotive is gradually reduced. Disadvantage The hydraulic coupler can only transfer torque without changing the size, it must be used in conjunction with the transmission mechanism； It must add the clutch between coupling and transmission; Increase the quality and size of the transmission system; It exists losing of liquid flow , the efficient of the system is less than that of single clutch
Chapter 16 Vehicle automatic transmission 窗月桥大学 TONGII UNIVERSTTY Torque converter turbine impeller input shaft
Chapter 16 Vehicle automatic transmission Torque converter
Chapter 16 Vehicle automatic transmission 窗月桥大学 TONGII UNIVERSTTY The structure of torque converter >Composition:impeller,turbine,guide wheel starting gear- turbine impeller >Fixed to the fixed sleeve. guide wheel Min M2n2 >Fixed to the output shaft. crankshaft driven shaft shell fixed sleeve >Fixed to the engine crankshaft. schematia diagram of torque converter
Chapter 16 Vehicle automatic transmission Fixed to the engine crankshaft. Fixed to the output shaft. Composition: impeller，turbine，guide wheel The structure of torque converter Fixed to the fixed sleeve
Chapter 16 Vehicle automatic transmission 窗月桥大学 TONGII UNIVERSTTY The structure of torque converter thrust bearing front cover lock-up clutch plate absorber turbine guide wheel impeller composition of torque converter
Chapter 16 Vehicle automatic transmission 飞轮 涡轮 导轮 泵轮 变矩器壳 The structure of torque converter