汽车专业外语054ppt课件.ppt
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1、,Automobile Steering System 汽车转向系统,Unit 8,Passage A,Has the most significant influence on vehicle performance and reliability. Includes: steering wheel, steering gears, linkages, and other components, used to control the direction of a vehicles motion. Two different types of steering gear: rack-and-
2、pinion and recirculating-ball steering gears.,Steering system,Passage A,Rack-and-pinion Steering,Passage A,Pretty simple mechanism. The most common type of compact car, small truck and SUV in which the engine compartment space is limited. What are the basic parts of this system? Steering wheel, pini
3、on gear, rack and linkage.,http:/ A,Rack-and-pinion Steering,Passage A,The steering wheel and steering shaft are connected to a pinion gear. The pinion gear is in mesh with a straight bar, called a rack that has teeth on one side. When the driver turns the steering wheel, the pinion gears turns, cau
4、sing the rack to move. This movement, in turn, is connected to a linkage that moves the front wheels,http:/ A,Rack-and-pinion Steering,Passage A,The steering linkage consists of two inner tie rods and two tie rod ends. The former two are attached to the steering rack ends, and the latter two are att
5、ached to the suspension arms on the steering knuckles. Rubber boots are used to cover and protect the inner tie rod assemblies from road splash. The exploded view of the system is shown in right figure.,http:/ A,Rack-and-pinion Steering,Passage A,It converts the rotational motion of the steering whe
6、el into the linear motion needed to turn the wheels. It provides a gear reduction, making it easier to turn the wheels.,Two functions,On most cars, it takes three to four complete revolutions of the steering wheel to make the wheels turn from lock to lock (from far left to far right),Passage A,Recir
7、culating-ball steering,Passage A,The disadvantage of the rack-and-pinion system is: As to the larger and heavier the car, the more difficult it is to steer. Most large cars are equipped with a recirculating-ball steering gear, this type of steering gear is very low in friction and provides a good me
8、chanical advantage for a heavy vehicle.,Passage A,Recirculating-ball steering,Passage A,http:/ worm gear is mounted on the end of the steering gear shaft. And a pitman shaft is mounted in the housing in a position 90to the worm gear. A ball nut rides on the worm gear and a gear on the pitman shaft,
9、called the sector, is engaged with this nut.,The steering shaft is connected to the steering wheel either directly or through some type of flexible joint.,Passage A,Recirculating-ball steering,Passage A,http:/ recirculating-ball construction results in a friction-free contact between the nut and the
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