Unit7BrakeSystem汽车英语.ppt

Unit3 Brake System,Contents,Lead-in,Please watch the video.,How do you think about it?,the importance of the brake system,Warming up,Brake system (function),service (foot) brake,parking (hand) brake,The classification of the brake system,additional retarding brake,retard rit:d vt.使减速;妨碍;阻止,行驶(脚)制动,驻车(手)制动,辅助制动,The History of Brake System,简单机械制动器,Four stages,Simple Mechanical Brake,真空助力制动器,液压助力制动器,Hydraulic Booster Brake,防抱死制动系统,Anti-lock Brake System,Vacuum Booster Brake,Warming up,Structure,Important Words & Phrases,tubing n. 管道系统 e.g. brake tubing (hose, line)制动管路 brake pad n. 制动块 brake shoe n. (制动)蹄 hydraulic brake booster (HBB) 液压制动助力器,Important Words & Phrases,Important Words & Phrases,parking n. 停车,驻车; 停车位(处) e.g. parking (hand) brake 驻车(手)制动 incipient adj.: initial 初始的 protrude v. : stick out from somewhere突出 e.g. A pair of shoes protruded from the bed.,Important Words & Phrases,momentarily adv. 即刻,马上 momentary adj. moment n. e.g. at the/this/that just/wait a the last Ill be with you . There was a pause.,moment,moment,moment,momentary,momentarily,Important Words & Phrases,function: bring a vehicle to a safe controlled stop,Foot brake,Function,The brake system is one of the most important safety systems on the automobile. The ability (of the brake system to bring a vehicle to a safe controlled stop) is absolutely essential in preventing accidental vehicle damage, personal injury, and loss of life.,必要的,不可缺的少,最重要的,adj.意外的,偶然的,n.丧失,遗失,Foot brake,Formation,A common brake system consists of brake pedal, master cylinder, disc or drum brakes, brake tubing, and proportioning valve.,制动踏板,比例阀,制动管路,盘式或鼓式 制动器,制动主缸,brake System,brake pedal,master cylinder,disc or drum brakes,brake tubing,proportioning valve,Foot brake,1-盘式制动器；2-制动钳；3-制动管路；4-制动踏板; 5-制动主缸；6-制动轮缸；7-鼓式制动器,Front Brake,Rear Brake,caliper klip 卡钳;卡尺,When driver pushes down on the brake pedal, a hydraulic pressure is produced in the master cylinder, and enters into wheel cylinder through the brake tubing.,Translation:当司机踩下制动踏板,主缸中产生液压,并通过 制动管路进入轮缸。,Foot brake,Operating Process,制动踏板,液压,制动主缸,轮缸,制动管路,Foot brake,Necessity,To identify and to correct a brake system problem, as well as to restore that system to its maximum effectiveness, requires considerable knowledge of the systems construction and operation.,Translation:确认和排除制动系统的故障以及恢复制动系统的最高制动效率，需要相当多的有关制动系统结构和运行方面的知识。,adj.相当多的，相当大的,n. structure 结构,效率,排除,诊断,恢复,This includes the friction devices (at each of the vehicles wheels) and the mechanical and hydraulic control systems (that control the action of these friction devices).,Translation: 这包括每个车轮的摩擦装置和控制这些摩擦装置的动作机械液压控制系统。,Foot brake,摩擦装置,机械液压控制系统,Principle of Brake System,制动系统工作原理,1.brake pedal制动踏板,2.push rod推杆,3.master cylinder piston主缸活塞,4.master cylinder制动主缸,5.oil tube油管,6.wheel cylinder轮缸,7.wheel cylinder piston,8.brake drum,9.friction lining摩擦片,10.brake shoe,11.brake back plate制动底板,12.supporting pin支撑销,13.brake shoe return spring,Foot brake,Principle,The brake system depends on the principle of friction for operation.,摩擦,Sliding friction 动摩擦,Static friction 静摩擦,Friction 摩擦,Foot brake,Sliding friction is the rubbing action (of one object sliding on the surface of another), such as a brake disc on a brake pad or a brake drum on a brake lining.,动摩擦,制动盘,制动鼓,制动块,制动衬片,摩擦动作,Translation:动摩擦是指一个物体在另一个物体表面滑动的摩擦动作。如制动盘在制动块或制动鼓在制动衬片上的摩擦动作。,Static friction is the resistance to the sliding of one object on the surface of another.,静摩擦,阻力,Foot brake,Translation:静摩擦是指一个物体 在另一个物体表面滑动的阻力。,Foot brake,In a brake system, when the brakes are applied there is sliding friction between the shoe and drum or the disc and pad, as long as the wheels are still turning, and there is static friction between the tire and the road surface.,只要,如果,Operation Process,动摩擦,(制动)蹄,(制动)鼓,制动盘,静摩擦,轮胎,Translation: 在制动系统中，当施加制动时，只要车轮仍在旋转，在制动蹄、制动鼓之间或制动盘、制动块之间存在动摩擦，而在轮胎和路面之间存在静摩擦。,制动块,Foot brake,Upon severe braking, the wheels become locked, at which time there is a sliding friction between the tire and the road and static friction between the shoe and drum or disc and pad.,紧急制动,状 语,动摩擦,静摩擦,Translation:紧急制动时,车轮抱死,此时在轮胎和路面之间存在动摩擦,在制动蹄、制动鼓或制动盘、制动块之间存在静摩擦。,Foot brake,The most effective braking takes place just before wheel lock-up occurs. The amount of pressure (applied to the surfaces in contact) determines the amount of friction present.,n. 出现,发生,Braking Time & Amount of Friction,Translation:最有效的制动出现在车轮抱死之前。施加在接触表面压力的多少决定了摩擦出现的多少。,Parking brake,Function,The function of parking brake is to make sure the stopping vehicle parking.,确保,保证,驻车制动,Translation:驻车制动的功用是确保停驶的车辆可靠驻停。,Types,Commonly the rear-wheel drum brake is for the parking brake.,后轮鼓式制动器,Parking brake,Translation:通常，后轮鼓式制动器用于驻车制动。,Some cars use a vacuum motor to release the parking brake automatically as soon as the car starts.,真空马达,时间状语,Parking brake,Translation:某些车辆一旦起步,能够通过真空马达自动释放驻车制动。,Parking brake,Older cars and some trucks use a drum (mounted at the rear of the transmission) 【for the parking brake】.,目的状语,安装,变速器,Translation:较老轿车和一些卡 车使用安装在变速器后部的制 动鼓作为驻车制动。,Parking brake,Operation Process,The parking brake may be operated by a separate foot pedal or by a hand-operated lever.,单独的脚制动踏板,手操纵杆,Translation：驻车制动可以由单独的脚制动踏板或手操纵杆进行操作。,The lever or pedal operates a cable system (linked to the rear brakes) and applies them mechanically.,后轮制动器,controls the rear brakes,Parking brake,Translation: 操纵杆或踏板操纵连到后轮制动器的绳索系统，并机械地控制后轮制动器。,Parking brake,Pushing down the pedal tightens the cable and forces the shoes against the drum or the pads against the rotor.,动名词短语作主语,靠,碰,触,倚,连接并列谓语,转子,转动元件,Translation:踩下踏板将绳索拉紧,使制动蹄压紧在制动鼓上或使制动块压紧在转动元件上。,Anti-lock Brake System,Function,The function of an anti-lock, or anti-skid braking system is to prevent the wheels from locking under hard braking.,anti- Pref.: preventing防/阻止,抗 e.g. antifreeze 防冻剂,Translation： 防抱死或防滑移制动系统的功用是防止紧急制动时车轮抱死。,紧急制动,防抱死,防滑移,Maximum braking force is obtained just before the wheels lock and skid.,Time of Brake Force,Translation:在车轮刚要抱死 滑移前可以得到最大的制动力。,Anti-lock Brake System,Anti-lock Brake System,Such anti-skid systems are useful on slippery surfaces, such as ice and snow, (where the wheels may lock easily).,adj. (物体表面)光滑的;(指人)狡猾的,不可靠的,非限定性定语从句,illumination,Translation:这样的防滑制动系统对于冰雪等光滑路面非常有用，在这些路面上车轮很容易抱死。,Locked wheels are dangerous because the car needs a much longer distance to stop. Locked wheels also can cause the driver to lose control.,Anti-lock Brake System,Translation:抱死的车轮是很危险的，因为车辆需要较长的距离才能停下来。抱死的车轮还能导致车辆失去控制。,Anti-lock Brake System,Formation,The ABS consists of components such as the ABS sensors, stoplight switch, hydraulic unit in hydraulic brake booster (HBB), ECU, and the ABS warning light.,液压制动助力器,ABS 传感器,停车灯开关,液压单元,电子控制单元,ABS警告灯,ABS :Anti-lock Brake System,防抱死制动系统,disk brake,wheel,drum brake,vacuum booster,front wheel speed sensor,hydraulic control unit,rear wheel velocity sensor,Main parts of ABS,Anti-lock Brake System,Operation process,The system uses a sensor that knows when one wheel (or a pair of wheels) is skidding. The sensor sends a signal to a computer, (which signals a modulator valve).,n.,v.,液压调节器电磁阀,Anti-lock Brake System,The modulator connects into the hydraulic system and can momentarily release the brake pressure and prevent the wheels from locking. (The pressure release is so fast that a driver is seldom aware of it.),连接 并列 谓语,使不能做某事,防止,阻止,即刻,马上,明白,知道,意识到,Anti-lock Brake System,Pressure is then reapplied until the sensor