汽车专业英语SpecialtyEnglishforAutomobile.ppt

汽车专业英语 Specialty English for Automobile 张志飞 E-mail: cquzzf@cqu.edu.cn Tel:Chapter 4 Braking system Feature: a distinctive attribute or aspect of something Energy is required when a vehicle is accelerated from rest to a certain speed. A proportion of that energy is now stored in the vehicle and is called kinetic energy. In order to reduce the speed of the vehicle, the brakes have to convert the kinetic energy to heat energy; the speed of conversion governs the rate at which the vehicle slows down. 汽车从原地起步(静止)加速到某一速度需要能量，储存在汽车中的那部分能量称为动能。要降低车速,制动器必须把动能转换为热能；转换的速度决定了汽车减速的快慢。 A braking system consists of energy-supplying device, a control device, a transmission device and the brake. 供能装置、控制装置、传动装置、制动器 The three types of braking systems are in use today: service braking system, parking braking system and additional retarding-braking system. The service braking system and the parking braking system have separate control and transmission devices. The service braking system is normally foot-operated, while the parking braking system is hand-operated. 行车制动系、驻车制动系、（缓速式）辅助制动系 Differentiate： recognize or ascertain what makes (someone or something) different Muscular-energy braking system: Energy-assisted braking system power Non-muscular-energy braking system Inertia braking system Gravity braking system Vacuum Hydraulic power 人力制动系 助力制动系 非人力制动系 （动力制动系） 惯性制动系 重力制动系 Drum / disc brake Front rear Brake pedal Master cylinder Brake lines/hoses Metering valve Proportioning valve Wheel valve Disc // caliper Drum brake Two types of hydraulic brake systems are used. The manual brake system is the simplest. Here, the force of the driver’s foot on the pedal applies all the force to the hydraulic system. Another system, the power system, uses parts that assist a driver to the hydraulic system. There is also an antiskid system that prevents the brakes from locking up the wheels and causing skidding. Single-circuit braking system Multi-circuit braking system M