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: 欧美一区二区三区在线视频播放| 国产一卡二卡在线播放| 国产黄一区二区毛片免下载| 国产精品刺激对白麻豆99| 国产精品日韩一区二区| 欧美日韩激情一区二区| 午夜免费av电影| 538国产精品一区二区在线| 亚洲精品国产久| 国产精品久久国产三级国电话系列 | 国产精品99在线播放| 国产精品国产三级国产专播精品人| 亚洲va欧美va国产综合先锋| 久久久精品中文| 91精品丝袜国产高跟在线| 久久久综合香蕉尹人综合网| 欧美在线免费观看一区| 国产精品亚洲а∨天堂123bt| 亚洲欧美国产一区二区三区| 国产三级精品在线观看| 欧美日韩国产一二| 精品国产品香蕉在线| 国产一区日韩一区| 日本一二三不卡| 91精品视频在线免费观看| 国产精品天堂| 精品a在线| 国产美女三级无套内谢| 亚洲一二三在线| 欧美亚洲视频一区| 91午夜在线观看| 欧美一区二区三区性| 亚洲欧美一区二区三区三高潮| 国产99小视频| 欧洲激情一区二区| 一区二区中文字幕在线观看| 亚洲国产精品国自产拍久久| 欧美日韩精品不卡一区二区三区| 一区精品二区国产| 亚洲精品久久久久中文第一暮| 日韩av在线影视| 亚洲精品久久久久一区二区| 欧美日韩一区不卡| 中文字幕一区二区三区乱码 | 亚洲国产另类久久久精品性| 国产999久久久| 亚洲精品日本无v一区| 国内久久久| 亚洲精品久久久久999中文字幕 | 国产欧美久久一区二区三区| 亚洲国产精品91| 久久精品综合| 久久国产精品网站| 欧美3p激情一区二区三区猛视频| 国产真裸无庶纶乱视频| 日本二区在线播放| 国产精品色婷婷99久久精品| 午夜老司机电影| 亚洲乱码一区二区三区三上悠亚 | 国产精品麻豆自拍| 欧美乱妇高清无乱码一级特黄| 日韩亚洲欧美一区| 蜜臀久久精品久久久用户群体| 精品婷婷伊人一区三区三| 久久午夜无玛鲁丝片午夜精品| 中文字幕av一区二区三区高| 国产国产精品久久久久| 亚洲国产一二区| 日本精品一二区| sb少妇高潮二区久久久久| 激情久久久久久| 日本高清二区| 26uuu色噜噜精品一区二区| 精品福利一区| 日本免费电影一区二区| 97欧美精品| 影音先锋久久久| 97人人澡人人爽人人模亚洲| 日韩精品一区中文字幕| 视频一区欧美| 久久国产精久久精产国| 九九精品久久|