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: 欧美性受xxxx狂喷水| 欧美乱大交xxxxx| 国内揄拍国产精品| 一色桃子av| 国产在线观看二区| 国产免费一区二区三区四区五区 | 亚洲欧美一区二区三区不卡| 午夜一区二区视频| 国产日韩欧美不卡| 亚洲午夜国产一区99re久久| 国产精品18久久久久久白浆动漫| 亚洲欧美国产日韩综合| 午夜a电影| 日韩av中文字幕在线免费观看| 少妇高潮在线观看| 欧美视频1区| 国产亚洲精品久久久久久久久动漫| 99久久国产综合精品女不卡| 国产精品综合在线观看| 久久精品国产亚洲一区二区| 99精品黄色| 国产中文字幕一区二区三区| 91亚洲精品国偷拍| xxxxx色| 日韩av在线影视| 国产999久久久| 精品国产一区二区三区高潮视| 午夜精品一区二区三区aa毛片| 欧美精品久| 欧美日韩激情在线| 久久噜噜少妇网站| 免费毛片**| 欧美一区二区免费视频| 欧美日韩中文不卡| 91黄在线看 | 美国三级日本三级久久99| 欧美精品一区二区久久| 99国产午夜精品一区二区天美| 久久一二区| 日本一区二区三区在线看| 国产伦理久久精品久久久久| 国产91免费观看| 天干天干天啪啪夜爽爽99| 国产精品电影一区二区三区| 午夜精品一区二区三区在线播放| 美国三级日本三级久久99| 日韩av中文字幕第一页| 久久99久国产精品黄毛片入口| 日本精品一区二区三区在线观看视频 | 欧美国产在线看| 国产精品日韩一区二区| 欧美精品免费视频| 色综合欧美亚洲国产| 国产亚洲综合一区二区| 午夜诱惑影院| 国产精品麻豆99久久久久久| 色偷偷一区二区三区| 欧美日韩偷拍一区| 狠狠色噜噜狠狠狠狠米奇777| 国产欧美视频一区二区三区| 91看片免费| 日韩美一区二区三区| 久久99视频免费| **毛片在线免费观看| 丰满少妇高潮惨叫久久久一| 欧美精品在线观看视频| 一区二区免费播放| 99欧美精品| 国产网站一区二区| 亚洲自偷精品视频自拍| 国产欧美精品va在线观看| 电影91久久久| 免费观看黄色毛片| 日本一二三四区视频| 欧美一区久久久| 国产精品欧美日韩在线| 亚洲精品久久久久中文字幕欢迎你| 国产真实一区二区三区| 免费看大黄毛片全集免费| 精品国产1区2区3区| 国产精品久久久久久久岛一牛影视| 午夜毛片在线|