34640课件 汽车专业英语(第3版).ppt

Automobile English Unit 8 Automotive Steering System Passage A Types of Steering System The pitman arm is connected to one end of the track rod. In the other end of the track rod is an idler arm. Between the idler and pitman arms, the track rod is supported in the proper position to keep the left and right wheels working together. The inner tie rod ends are attached to either end of the track rod and provide pivot points for the steering gear. From there they go to the outer tie rod ends through an adjustment sleeve. This sleeve joins the inner and outer tie rod ends together and allows for adjustment when the front wheels are aligned. The outer tie rod ends are connected to the steering knuckle arms that actually turn the front wheels. See figure 8-1c. Figure 8-1c Tie rod ends 第三百一十九页，编辑于星期二：二十一点 十三分。 Automobile English Unit 8 Automotive Steering System Passage A Types of Steering System Rack and Pinion Steering Many modern cars use rack and pinion steering mechanisms. The advantage of rack and pinion steering is relatively simple and the cost is low. And it has a much better direct steering feel for the driver. By reducing the number of parts and pivot points, it can more accurately control wheel direction, making the steering more responsive. See figure 8-2a. The rack and pinion steering system consists of steering wheel, steering shaft, rack and pinion gear, tie rod and steering knuckle arm. In the rack and pinion steering, the steering wheel, through the steering shaft, is directly connected to a pinion gear that is in mesh with the rack. The rack is a long, toothed bar, which is attached to each end with the inner tie rod ends. The outer tie rod ends are attached to the steering knuckle arms. See figure 8-2b. 第三百二十页，编辑于星期二：二十一点 十三分。 Automobile English Unit 8 Automotive Steering System Passage A Types of Steering System When you turn the steering wheel, the pinion gear turns, causing the rack to move from left to right. This movement, in turn, via tie ro