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: 国产88av| 狠狠色噜噜狠狠狠合久| 国产精品一区二| 中文在线一区| 欧美日韩国产一二三| 久久精品国产色蜜蜜麻豆| 国产精品久久91| 国产91在线拍偷自揄拍| 黄色av免费| 国产91精品一区二区麻豆亚洲| 好吊色欧美一区二区三区视频 | 亚洲欧美另类国产| 国产精品一二二区| 国产精品高潮呻| 91黄在线看 | 久久一二区| 亚洲乱小说| 亚洲欧美v国产一区二区| 国产色婷婷精品综合在线手机播放| 欧美日韩精品在线播放| 国产精品1区2区| 国产97在线播放| 国产69精品久久久久999天美| 国产二区不卡| 少妇性色午夜淫片aaa播放5| 欧美乱偷一区二区三区在线| 久久久精品欧美一区二区| 国偷自产一区二区三区在线观看| 久久噜噜少妇网站| 欧美一区二区免费视频| 午夜一级电影| 国产精品v一区二区三区| 艳妇荡乳欲伦2| 好吊色欧美一区二区三区视频| 欧美一区二区三区片| 国产二区免费| 日韩欧美中文字幕一区| 99久久www免费| 伊人久久婷婷色综合98网| 亚洲无人区码一码二码三码 | 国产精品精品视频一区二区三区| 国产99网站| 国产日韩欧美综合在线| 亚洲国产午夜片| 午夜电影一区二区三区| 国产伦理一区| 国产伦精品一区二区三区免| 91精品视频免费在线观看| 国产经典一区二区| 久久久久亚洲| 亚洲国产精品入口| 国产欧美日韩综合精品一| 亚洲欧美一卡| 国产一级一片免费播放| 国产精品香蕉在线的人| 国产一级自拍| 国产精品一区亚洲二区日本三区| 久久久精品a| 扒丝袜网www午夜一区二区三区| 99re国产精品视频| 国产全肉乱妇杂乱视频在线观看| 91看片淫黄大片91| 精品国产免费久久| 一区二区三区四区视频在线| 午夜一区二区视频| 国产一级片网站| 国产综合亚洲精品| 国产欧美精品一区二区三区-老狼 国产精品一二三区视频网站 | 精品在线观看一区二区| 日韩精品乱码久久久久久| 99久久国产免费,99久久国产免费大片| 国产午夜精品一区二区三区视频| 97欧美精品| 久久精品com| 国产亚洲精品久久久久秋霞| 午夜叫声理论片人人影院| 久久乐国产精品| 日韩一级片在线免费观看| 国产一区二区视频播放| 国产第一区二区| 国内偷拍一区| 国产乱对白刺激视频在线观看|