概念汽车实用英语毛矛概念汽车实用英语U4课件教学.pptVIP

PPT研究院 POWERPOINT ACADEMY * * WORDS AND PHRASES paradigm [p?r?daim] n. 范例；范式；模范 shifting [?ifti?] n. 移动；移位 * WORDS AND PHRASES paradigm-shifting 范式转换；模式转移 tried-and-true [traid?ntru:] a. 经过检验而可靠的；靠得住的 bumpy [b?mpi] a. 颠簸的；崎岖不平的 * READING MATERIAL： SUSPENSION TYPES Discussions about car suspensions may focus on how springs and dampers function on any given wheel. But the four wheels of a car work together in two independent systems — the two wheels connected by the front axle and the two wheels connected by the rear axle. * SUSPENSION TYPES That means that a car can and usually does have a different type of suspension on the front and back. Much is determined by whether a rigid axle binds the wheels or if the wheels are permitted to move independently. * SUSPENSION TYPES The former arrangement is known as a dependent system, while the latter arrangement is known as an independent system. In the following sections, well look at some of the common types of front and back suspensions typically used on mainstream cars. * SUSPENSION TYPES 1. Dependent Front Suspensions Dependent front suspensions have a rigid front axle that connects the front wheels. Basically, this looks like a solid bar under the front of the car, kept in place by leaf springs and shock absorbers. Common on trucks, dependent front suspensions havent been used in mainstream cars for years. * SUSPENSION TYPES 2. Independent Front Suspensions In this setup, the front wheels are allowed to move independently. The MacPherson strut, developed by Earle S. MacPherson of General Motors in 1947, is the most widely used front suspension system, especially in cars of European origin.? * SUSPENSION TYPES The MacPherson strut combines a shock absorber and a coil spring into a single unit. This provides a more compact and lighter suspension system that can be used for front-wheel drive vehicles. The double-wishbone suspension, also known as an A-arm suspension, is another common type of front independent suspension