人人爽人人干,男女污视频在线观看,黑帮老大和我的365日2,久久亚洲成人av,亚洲日本一区二区三区,99er6免费热在线观看精品,亚洲一区免费看,91麻豆产精品久久久久久夏晴子

Disc brake History

 

Early experiments

Development of disc brakes began in England in the 1890s.

The first caliper-type automobile disc brake was patented by Frederick William Lanchester in his Birmingham factory in 1902 and used successfully on Lanchester cars. However, the limited choice of metals in this period meant that he had to use copper as the braking medium acting on the disc. The poor state of the roads at this time, no more than dusty, rough tracks, meant the copper wore quickly making the system impractical.

The American Crosley Hot Shot is often given credit for the first production disc brakes. For six months in 1950, Crosley built a car with these brakes, then returned to drum brakes. Lack of sufficient research caused reliability problems, such as sticking and corrosion, especially in regions using salt on winter roads. Drum brake conversions for Hot Shots were quite popular. The Crosley disc was a Goodyear development, a caliper type with ventilated disc, originally designed for aircraft applications.

Chrysler developed a unique braking system, offered from 1949 to 1953. Instead of the disc with caliper squeezing on it, this system used twin expanding discs that rubbed against the inner surface of a cast-iron brake drum, which doubled as the brake housing. The discs spread apart to create friction against the inner drum surface through the action of standard wheel cylinders. Because of the expense, the brakes were only standard on the Chrysler Crown and the Town and Country Newport in 1950. They were optional, however, on other Chryslers, priced around $400, at a time when an entire Crosley Hot Shot retailed for $935. This four-wheel disc brake system was built by Auto Specialties Manufacturing Company (Ausco) of St. Joseph, Michigan, under patents of inventor H.L. Lambert, and was first tested on a 1939 Plymouth. Chrysler discs were "self energizing," in that some of the braking energy itself contributed to the braking effort. This was accomplished by small balls set into oval holes leading to the brake surface.When the disc made initial contact with the friction surface, the balls would be forced up the holes forcing the discs further apart and augmenting the braking energy. This made for lighter braking pressure than with calipers, avoided brake fade, promoted cooler running, and provided one-third more friction surface than standard Chrysler twelve-inch drums. Today's owners consider the Ausco-Lambert very reliable and powerful, but admit its grabbiness and sensitivity.

Racing breakthrough

Reliable caliper-type disc brakes first appeared in 1953 on the Jaguar C-Type racing car. These brakes helped the company to win the 1953 24 Hours of Le Mans,developed in the UK by Dunlop. That same year, the aluminum bodied Austin-Healey 100S, of which 50 were made, was the first car sold to the public to have disc brakes, fitted to all 4 wheels.

Mass production

The first mass production use of the modern disc brake was in 1955, on the Citroën DS, which featured caliper-type front disc brakes among its many innovations. These discs were mounted inboard near the transmission, and were powered by the vehicle's central hydraulic system. This model went on to sell 1.5 million units over 20 years with the same brake setup.

The Jensen 541, with four-wheel disc brakes, followed in 1956.

Disc brakes were most popular on sports cars when they were first introduced, since these vehicles are more demanding about brake performance. Discs have now become the more common form in most passenger vehicles, although many (particularly light weight vehicles) use drum brakes on the rear wheels to keep costs and weight down as well as to simplify the provisions for a parking brake. As the front brakes perform most of the braking effort, this can be a reasonable compromise.

Many early implementations for automobiles located the brakes on the inboard side of the driveshaft, near the differential, while most brakes today are located inside the wheels. An inboard location reduces the unsprung weight and eliminates a source of heat transfer to the tires.

Historically, brake discs were manufactured throughout the world with a strong concentration in Europe and America. Between 1989 and 2005, manufacturing of brake discs migrated predominantly to China.

2016-09-27 23:56:04
主站蜘蛛池模板: 香港三日本8a三级少妇三级99| 99精品黄色| 69久久夜色精品国产7777| 精品欧美一区二区在线观看| 国产午夜精品一区二区三区四区| 欧美精品一卡二卡| 右手影院av| 国产女人好紧好爽| 欧美日韩国产午夜| 中文字幕一区二区三区日韩精品| 免费91麻豆精品国产自产在线观看| 亚洲乱亚洲乱妇50p| 91麻豆精品一区二区三区| 97人人澡人人爽人人模亚洲| 国产精品刺激对白麻豆99| 国产一区二区免费在线| 国产精品国产一区二区三区四区| 少妇厨房与子伦免费观看| 国精产品一二四区在线看| 91午夜在线| 欧美日韩一区二区三区不卡| 久久91久久久久麻豆精品| 精品三级一区二区| 午夜电影网一区| 欧美日韩国产专区| 99国产超薄丝袜足j在线观看| 99久久精品国产国产毛片小说| 久久国产精久久精产国| 91精品久久久久久久久久| 亚洲国产欧美一区| 999偷拍精品视频| 国产伦精品一区二区三| 国产日产高清欧美一区二区三区| 大桥未久黑人强制中出| 国产区二区| 淫片免费看| 亚洲精品国产91| 美女脱免费看直播| 99爱精品视频| 一区二区三区四区国产| 亚洲精品456在线播放| 国产日韩欧美另类| 97久久超碰国产精品| 国产精品电影免费观看| 国产一区二区极品| 夜夜精品视频一区二区| 欧美日韩激情一区二区| 国产一级二级在线| 蜜臀久久99精品久久久久久网站| 99精品视频一区二区| 欧美日韩亚洲国产一区| 精品久久不卡| 午夜亚洲影院| 91精品一二区| 在线观看v国产乱人精品一区二区 国产日韩欧美精品一区二区 | 婷婷嫩草国产精品一区二区三区| 国产精品美女久久久免费| 国产二区免费| 国偷自产中文字幕亚洲手机在线| 欧美色综合天天久久| 国产片91| 国产精品女同一区二区免费站| 精品国产18久久久久久依依影院| 午夜肉伦伦| 国产精品黑色丝袜的老师| 午夜亚洲影院| 国产免费一区二区三区四区五区| 日韩精品一区在线视频| 久久精品亚洲精品| 亚洲欧美国产精品一区二区| 国产麻豆一区二区| 欧美在线视频精品| 一区二区三区欧美日韩| 中文乱幕日产无线码1区| 午夜特片网| 日韩av三区| 欧美极品少妇xxxxⅹ| 强制中出し~大桥未久在线播放 | 91精品啪在线观看国产| 国产精品色在线网站| 久精品国产| 国产麻豆91视频|