同济大学：《汽车构造》课程电子教案（课件讲稿）Chapter 23 汽车转向系统 Steering system

Chapter twenty-three Steering system 窗月桥大学 TONGII UNIVERSTTY Chapter twenty-three Steering system

第二十三章 汽车转向系统 Chapter twenty-three Steering system Chapter twenty-three Steering system

Chapter twenty-three Steering system 圖月儕大学 TONGII UNIVERSTTY Main contents >Summarize; >Steering control mechanism: >Steeriùng gear: >Steering transmission mechanism >Hydraulic power steering system;

第二十三章 汽车转向系统 Main contents Summarize； Steering control mechanism； Steering gear； Steering transmission mechanism ； Hydraulic power steering system； Chapter twenty-three Steering system

Chapter twenty-three Steering system 同©大学 TONGII UNIVERSTTY First quarter:Summarize >Definition of steering system:System in car which is used to change or regain its drive path. Steering column universal joint Oil tank shield Power steering pump ball Tie rod Power steering inner articulated shaft cylinder universal joint shield hall 77 Oil return pipe Tie rod

第二十三章 汽车转向系统 First quarter: Summarize Definition of steering system：System in car which is used to change or regain its drive path. Chapter twenty-three Steering system Steering column universal joint shield steering inner articulated shaft universal joint shield Power steering pump Oil tank ball Tie rod ball Tie rod Steering gear Power cylinder Oil return pipe

Chapter twenty-three Steering system 同©大学 TONGII UNIVERSTTY Functions and types of steering system >Function of steering system:Ensure the car can steering and driving normally according to the driver's request. According to the energy >Take the driver's physical of steering system of car strength as the steering energy, in which all the transmission >Manual steering system parts are mechanic parts. >Take both the driver's >Power steering system physical strength and the power from the engine as the steering energy.And power steering device should be added to the steering system

第二十三章 汽车转向系统 Functions and types of steering system According to the energy of steering system of car Manual steering system Power steering system Take the driver’s physical strength as the steering energy, in which all the transmission parts are mechanic parts. Take both the driver’s physical strength and the power from the engine as the steering energy. And power steering device should be added to the steering system. Function of steering system：Ensure the car can steering and driving normally according to the driver’s request. Chapter twenty-three Steering system

Chapter twenty-three Steering system 同©大学 TONGII UNIVERSTTY Components of manual steering system Manual steering system mainly includes:steering control mechanism steering gear and steering transmission mechanism. steering gear Steering wheel >A series of parts box universal joint Steering (not includes steering universal shaft transmission joint gear)from steering Pitman arm shaft wheel to steering gear Knuckle arm steering drag link belongs to the steering Left Right knuckle knuckle control mechanism. >A series of parts (not Trapezium arm includes knuckle)from Trapezium arm pitman arm to steering Tie rod trapezium belongs to Diagram of mechanic steering system steering transmission mechanism

第二十三章 汽车转向系统  Manual steering system mainly includes: steering control mechanism、 steering gear and steering transmission mechanism. Components of manual steering system Chapter twenty-three Steering system Steering wheel Tie rod Trapezium arm Left knuckle Knuckle arm Pitman arm steering gear Right knuckle steering drag link Trapezium arm transmission shaft universal joint universal joint Steering shaft Diagram of mechanic steering system A series of parts box (not includes steering gear) from steering wheel to steering gear belongs to the steering control mechanism. A series of parts (not includes knuckle) from pitman arm to steering trapezium belongs to steering transmission mechanism

Chapter twenty-three Steering system 同©大学 TONGII UNIVERSTTY Components of manual steering system Steering control steering gear Steering wheel mechanism universal joint Steering universal shaft transmission joint >Steering wheel Pitman arm shaft Knuckle arm >Steering column steering drag link Left Right knuckle knuckle >Steering universal joint Trapezium arm Trapezium arm Tie rod Steering transmission Diagram of mechanic steering system mechanism Functions of steering universal joint >Pitman arm >Easy to place; >Tie rod >Eliminate bad effects caused by installation error and >Knuckle arm installation holder deformation; >Steering trapezium >Can easily achieve the generalization and serialization of parts

第二十三章 汽车转向系统 Steering control mechanism Steering wheel Steering column Steering universal joint Steering transmission mechanism Pitman arm Tie rod Knuckle arm Steering trapezium Components of manual steering system Chapter twenty-three Steering system Functions of steering universal joint Easy to place； Eliminate bad effects caused by installation error and installation holder deformation; Can easily achieve the generalization and serialization of parts

Chapter twenty-three Steering system 同©大学 TONGII UNIVERSTTY Components of manual steering system steering damper manual steering gear steering wheel steering tie rod safe steering shaft knuckle arm steering wheel knuckle Manual steering system of Hongqi-CA7220

第二十三章 汽车转向系统 Components of manual steering system steering tie rod steering wheel knuckle safe steering shaft steering wheel knuckle arm steering damper manual steering gear Manual steering system of Hongqi-CA7220 Chapter twenty-three Steering system

Chapter twenty-three Steering system 同©大学 TONGII UNIVERSTTY Components of manual steering system (video) worm sector Steering shaft pitman arm Steering wheel drag link kingpin knuckle knuckle arm tie rod

第二十三章 汽车转向系统 Components of manual steering system (video) worm Steering shaft pitman arm Steering wheel knuckle kingpin tie rod drag link knuckle arm Chapter twenty-three Steering system sector

Chapter twenty-three Steering system 同©大学 TONGII UNIVERSTTY Components of power steering system >Mechanic steering device: steering control mechanism,steering gear and Steering wheel steering transmission device. Steering shaft >Power steering device:steering oil Steering universal reservoir,oil pump,steering control transmission device valve,steering power cylinder. Steering control valve >Steering shaft drives steering control valve to rotate,make one side of steering Mechanic power cylinder's piston connected to steering gear Tie rod steering oil reservoir which pressure is zero and the other side of piston connected to oil-out of high pressure oil pump and push the piston rod to move. Steering hydraulic pump Oil pipe >When the power steering device loses Steering oil reservoir efficacy,it should be able to steering by Diagram of power steering system of Mazda6 driver alone

第二十三章 汽车转向系统 Power steering device: steering oil reservoir, oil pump, steering control valve, steering power cylinder. Mechanic steering device: steering control mechanism, steering gear and steering transmission device. Steering shaft drives steering control valve to rotate, make one side of steering power cylinder’s piston connected to steering oil reservoir which pressure is zero and the other side of piston connected to oil-out of high pressure oil pump and push the piston rod to move. When the power steering device loses efficacy, it should be able to steering by driver alone. Chapter twenty-three Steering system Components of power steering system Steering wheel Steering universal transmission device Steering shaft Tie rod Steering control valve Mechanic steering gear Steering oil reservoir Steering Oil pipe hydraulic pump Diagram of power steering system of Mazda6

Chapter twenty-three Steering system 圖月儕大学 TONGII UNIVERSTTY Ideal relationship between deflection angle of both sides wheel >To avoid increasing wheel's wear when steering,Each wheel's pure rolling is excepted when steering. That is every wheel's axis should intersect in one point. >B-distance of intersection between kingpin axis on both sides and ground; >L-wheel base of car; 中 >R-turning radius of car; >O-turning center of car. >Relationship between steering angle of inside wheel B and outside wheel a. Ideal relationship between deflection angle of both sides steering wheel when cot=cot邛+B/L double wheel's car is steering

第二十三章 汽车转向系统 To avoid increasing wheel’s wear when steering, Each wheel’s pure rolling is excepted when steering. That is every wheel’s axis should intersect in one point. Relationship between steering angle of inside wheel β and outside wheel α. cotα=cotβ+B/L B—distance of intersection between kingpin axis on both sides and ground; L—wheel base of car； R—turning radius of car； O—turning center of car. Chapter twenty-three Steering system Ideal relationship between deflection angle of both sides steering wheel when double wheel’s car is steering. Ideal relationship between deflection angle of both sides wheel