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: 亚洲欧美一区二区精品久久久| 国产日韩欧美在线一区| 久久精品国产一区二区三区| 精品国产区| 99色精品视频| 99久久国产综合精品女不卡| 日本一区二区三区免费播放| 国产专区一区二区| 国产一区二区免费在线| 久久精品二| 狠狠色噜噜狠狠狠合久| 99精品欧美一区二区| 国产69精品久久久久777| 午夜av影视| 日本午夜影视| 欧美福利一区二区| 日韩欧美国产高清91| 夜色av网站| 国产主播啪啪| 羞羞免费视频网站| 午夜影院一级片| 四虎精品寂寞少妇在线观看 | 少妇高潮一区二区三区99小说| 狠狠色狠狠色综合系列| 国产视频一区二区视频| 久久九九亚洲| 欧美日本三级少妇三级久久| 中文字幕欧美日韩一区| 91精品啪在线观看国产手机| 在线精品视频一区| 日韩av在线播放观看| 国产精品一区二区人人爽| 日韩中文字幕区一区有砖一区| 久久不卡精品| 国产日产欧美一区二区| 中文字幕日韩一区二区| 国内精品国产三级国产99| 久久国产精彩视频| 国产一区日韩欧美| 香港三日本三级三级三级| 国产亚洲精品久久777777| 国产综合久久精品| 国产精品九九九九九九九| 亚洲三区在线| 综合久久一区| 91国内精品白嫩初高生| 午夜理伦影院| 国产精品久久久久久久新郎| 狠狠色丁香久久综合频道日韩| 国产97久久| 国产精品亚发布| 国产一二三区免费| 国产精品天堂网| 欧美激情片一区二区| 欧美激情在线免费| 国内精品久久久久久久星辰影视| 国产乱一区二区三区视频| 久久影院国产精品| 99精品在免费线偷拍| 夜色av网| 午夜av电影网| 人人玩人人添人人澡97| 夜色av网站| 99久久精品一区| 欧美一区二区三区激情| 在线国产精品一区二区| 国产一级片自拍| 欧洲另类类一二三四区| 一级女性全黄久久生活片免费 | freexxxx性| 香港日本韩国三级少妇在线观看| 亚洲国产视频一区二区三区| 亚洲欧美一二三| 国产伦精品一区二区三区电影| 亚洲精品国产精品国产| 欧美日韩国产91| 国产欧美精品一区二区三区-老狼| 欧美激情精品一区| 国产99久久久国产精品免费看| 久久精品一二三四| 国产999在线观看| 亚洲欧美日本一区二区三区 |