Chapter 5 Steering System Section 1 Mode and Principle of Steering The steering system is used to control the direction of the vehicle. 1.Mode of Turning First,deflecting the wheels a relative angle to the body to achieve steering;Second,by changing the driving force on both sides of the running gears to achieve steering;Third,both changing the driving forces on both sides of the running gears and deflecting the wheels a relative angle to the body to achieve steering 械电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 5 Steering System The steering system is used to control the direction of the vehicle. 1. Mode of Turning First, deflecting the wheels a relative angle to the body to achieve steering; Second, by changing the driving force on both sides of the running gears to achieve steering; Third, both changing the driving forces on both sides of the running gears and deflecting the wheels a relative angle to the body to achieve steering. Section 1 Mode and Principle of Steering
Chapter 5 Steering System Section 1 Mode and Principle of Steering 服 (d) Figure 5-1 Some forms of deflecting wheels to steering (a)Front wheels deflection (b)Rare wheels deflection (c)Front and rare wheels all deflection (d)Roll-waist steering 机械电子工程模 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 5 Steering System (a) Front wheels deflection (b) Rare wheels deflection (c) Front and rare wheels all deflection (d) Roll-waist steering Figure 5-1 Some forms of deflecting wheels to steering Section 1 Mode and Principle of Steering
Chapter 5 Steering System Section 1 Mode and Principle of Steering 2.Analysis of Wheeled Vehicles Steering Theory 2.1 Kinematic Analysis According to the pure rolling requirements of the wheels when steering,the following three conditions should be met when steering for the 4X2 rear-wheel drive wheeled vehicles: (1)Achieving the front wheel deflection via the drivers' manipulation,and the degree of wheel deflection determines the vehicles'turning radius. (2)To achieve pure rolling of the two front wheels,it is required that the inside wheel's deflection angle a is larger than the outside wheel's deflection angle B,and the two angles should meet the following equation; M cotB-cota= L 械电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 5 Steering System 2. Analysis of Wheeled Vehicles Steering Theory 2.1 Kinematic Analysis According to the pure rolling requirements of the wheels when steering, the following three conditions should be met when steering for the 4×2 rear-wheel drive wheeled vehicles: (1) Achieving the front wheel deflection via the drivers’ manipulation, and the degree of wheel deflection determines the vehicles' turning radius. (2) To achieve pure rolling of the two front wheels, it is required that the inside wheel’s deflection angle α is larger than the outside wheel’s deflection angle β, and the two angles should meet the following equation; L M cot − cot＝ Section 1 Mode and Principle of Steering
Chapter 5 Steering System Section 1 Mode and Principle of Steering If the front and rear wheels are out phase when turning,the equation is; M cotB-cota= 2L (3)The distances traveled by the two driving wheels is not equal when steering because the rotating speed of the outside wheel is faster than that of the inner wheel,namely; n2_R+0.5B ni R-0.5B 机被与电子工程学聚 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 5 Steering System If the front and rear wheels are out phase when turning, the equation is; L M 2 cot − cot＝ (3) The distances traveled by the two driving wheels is not equal when steering because the rotating speed of the outside wheel is faster than that of the inner wheel, namely; R 0.5B R 0.5B n n 1 2 − + = Section 1 Mode and Principle of Steering
Chapter 5 Steering System Section 1 Mode and Principle of Steering (a】 (6) Figure 5-2 Steering process of wheeled vehicles (a)front-wheel steering (b)Four wheels out phase steering 业机械电子工程学 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 5 Steering System Figure 5-2 Steering process of wheeled vehicles (a) front-wheel steering (b) Four wheels out phase steering Section 1 Mode and Principle of Steering