TAILIEUCHUNG - Advanced Vehicle Technology Episode 2 Part 2

Tham khảo tài liệu 'advanced vehicle technology episode 2 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The need for constant velocity joints Universal joints are necessary to transmit torque and rotational motion from one shaft to another when their axes do not align but intersect at some point. This means that both shafts are inclined to each other by some angle which under working conditions may be constantly varying. Universal joints are incorporated as part of a vehicle s transmission drive to enable power to be transferred from a sprung gearbox or final drive to the unsprung axle or road wheel stub shaft. There are three basic drive applications for the universal joint 1 propellor shaft end joints between longitudinally front mounted gearbox and rear final drive axle 2 rear axle drive shaft end joints between the sprung final drive and the unsprung rear wheel stub axle 3 front axle drive shaft end joints between the sprung front mounted final drive and the unsprung front wheel steered stub axle. Universal joints used for longitudinally mounted propellor shafts and transverse rear mounted drive shafts have movement only in the vertical plane. The front outer drive shaft universal joint has to cope with movement in both the vertical and horizontal plane it must accommodate both vertical suspension deflection and the swivel pin angular movement to steer the front road wheels. The compounding of angular working movement of the outer drive shaft steering joint in two planes imposes abnormally large and varying working angles at the same time as torque is being transmitted to the stub axle. Because of the severe working conditions these joints are subjected to special universal joints known as constant velocity joints. These have been designed and developed to eliminate torque and speed fluctuations and to operate reliability with very little noise and wear and to have a long life expectancy. Hooke s universal joint Figs and The Hooke s universal joint comprises two yoke arm members each pair of arms being positioned at right angles to the other .

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