同济大学：《汽车构造》课程电子教案（课件讲稿）Chapter 16 自动变速器 Vehicle Automatic transmission

Chapter 16 Vehicle Automatic transmission 输 同©大学 TONGII UNIVERSTTY Chapter 16 Vehicle automatic transmission

Chapter 16 Vehicle Automatic transmission Chapter 16 Vehicle automatic transmission

Chapter 16 Vehicle automatic transmission 同廊大学 TONGII UNIVERSTTY MAIN CONTENTS >Classification The working principle of fluid coupling and torgue converter >The structure and principle of hydraulic mechanical transmission >The operating mechanism of automatic transmission >Metal Belt Continuously Variable transmission(CVT)

Chapter 16 Vehicle automatic transmission Classification The working principle of fluid coupling and torque converter The structure and principle of hydraulic mechanical transmission The operating mechanism of automatic transmission Metal Belt Continuously Variable transmission(CVT) MAIN CONTENTS

Chapter 16 Vehicle automatic transmission 同©大学 TONGII UNIVERSTTY Section 1 Overview >Definition of Automatic Transmission:One type of motor vehicle transmission that can automatically change gear ratios of transmission system according the working conditions such as engine load and yehicle speed,so that to make the vehicle to obtain good power performance and fuel economy,and reduce engine emissions ,and improve the driving safety and riding comfort and handling easiness

Chapter 16 Vehicle automatic transmission Definition of Automatic Transmission：One type of motor vehicle transmission that can automatically change gear ratios of transmission system according the working conditions such as engine load and vehicle speed, so that to make the vehicle to obtain good power performance and fuel economy, and reduce engine emissions ,and improve the driving safety and riding comfort and handling easiness. Section 1 Overview

Chapter 16 Vehicle automatic transmission 同©大学 TONGII UNIVERSTTY Classification Variation range of transmission radio: >Electronically controlled automatic mechanical transmission(AMT),achieve >Stepped type automatic gear shifting by adding electronic control part to MT >The transmission ratio can be >Stepless type continuously changed in a certain range. Electronic,Dynamic fluid type(torque converter),CVT. >Hydraulic mechanical transmission >Hydraulic-mechanical including torque converter and mechanical gear transmission,the ratio can change continuously in several intermittent ranges

Chapter 16 Vehicle automatic transmission Variation range of transmission radio: Stepped type Stepless type Hydraulic-mechanical Electronically controlled automatic mechanical transmission(AMT),achieve automatic gear shifting by adding electronic control part to MT The transmission ratio can be continuously changed in a certain range. Electronic, Dynamic fluid type(torque converter),CVT. Hydraulic mechanical transmission including torque converter and mechanical gear transmission, the ratio can change continuously in several intermittent ranges. Classification

Chapter 16 Vehicle automatic transmission 日©大学 TONGII UNIVERSTTY Classification Ways to operate >Hydraulic controlled hydraulic actuation automatic transmission:An automatic transmission which manipulates the shift valves for shifting directly according hydraulic control signals which are converted from control parameters using various control valves. >Electronic controlled hydraulic actuation automatic transmission:An automatic transmission uses the electronic control unit (ECU)for controlling the hydraulic valves and hydraulic actions to shift according the measured parameters of various sensors and in accordance with the internal control strategies

Chapter 16 Vehicle automatic transmission Ways to operate Hydraulic controlled hydraulic actuation automatic transmission: An automatic transmission which manipulates the shift valves for shifting directly according hydraulic control signals which are converted from control parameters using various control valves. Electronic controlled hydraulic actuation automatic transmission: An automatic transmission uses the electronic control unit (ECU) for controlling the hydraulic valves and hydraulic actions to shift according the measured parameters of various sensors and in accordance with the internal control strategies. Classification

Chapter 16 Vehicle automatic transmission 同©大学 TONGII UNIVERSTTY The composition of AT Hydraulic controlled hydraulic Electronic controlled hydraulic actuation automatic actuation automatic transmission transmission >Torque converter >Torque converter >The planetary gear >The planetary gear transmission mechanism transmission mechanism >Shift control mechanism of >Shift control mechanism of hydraulic control system electronic control system >Hydraulically operated >Hydraulically operated actuating mechanism actuating mechanism

Chapter 16 Vehicle automatic transmission The composition of AT Hydraulic controlled hydraulic actuation automatic transmission Torque converter The planetary gear transmission mechanism Shift control mechanism of hydraulic control system Hydraulically operated actuating mechanism Electronic controlled hydraulic actuation automatic transmission Torque converter The planetary gear transmission mechanism Shift control mechanism of electronic control system Hydraulically operated actuating mechanism

Chapter 16 Vehicle automatic transmission 同©大学 TDNVE Section 2 Fluid Coupling and Torque Converter >The fluid coupling and torque converter all are dynamic fluid transmission >Hydrodynamic fluid transmission refers to the hydraulic transmission of power by the change in kinetic energy of the fluid in the circular flow process

Chapter 16 Vehicle automatic transmission The fluid coupling and torque converter all are dynamic fluid transmission Section 2 Fluid Coupling and Torque Converter Hydrodynamic fluid transmission refers to the hydraulic transmission of power by the change in kinetic energy of the fluid in the circular flow process

Chapter 16 Vehicle automatic transmission 同©大学 TONGII UNIVERSTTY Fluid Coupling Turbine Impeller 涡轮 泵轮 output Input shaft shaft

Chapter 16 Vehicle automatic transmission Fluid Coupling 涡轮 泵轮

Chapter 16 Vehicle automatic transmission 窗月桥大学 TONGII UNIVERSTTY The structure of fluid coupling impeller >Hydraulic coupler mainly contains turbine impeller,turbine,shell. shell engine driven crankshaft shaft >The impeller which is connected to engine crankshaft is the active component. >The turbine which is connected to driven shaft is the driven Schematic diagram of the fluid coupling component

Chapter 16 Vehicle automatic transmission The structure of fluid coupling Hydraulic coupler mainly contains impeller, turbine, shell. The impeller which is connected to engine crankshaft is the active component. The turbine which is connected to driven shaft is the driven component

Chapter 16 Vehicle automatic transmission 同©大学 TONGII UNIVERSTTY The structure of fluid coupling >There is no mechanical connection between the impeller and the turbine, impeller turbine which are called as running wheel f and rely on the flowing fluid to transmit the power. flow direction >There are many vanes arranged along the radial direction of the annular shell composed by the running wheel.The working fluid is stored in the annular shell. >After assembled,there is a certain gap (3~4mm)between the impeller and the turbine,the longitudinal section through the axis is annular,which is called as circular circle.环形环

Chapter 16 Vehicle automatic transmission The structure of fluid coupling There is no mechanical connection between the impeller and the turbine , which are called as running wheel 工作 轮and rely on the flowing fluid to transmit the power. There are many vanes arranged along the radial direction of the annular shell composed by the running wheel. The working fluid is stored in the annular shell. After assembled, there is a certain gap (3~4mm) between the impeller and the turbine, the longitudinal section through the axis is annular, which is called as circular circle环形环