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: 狠狠色狠狠色综合久久第一次| 国产一区二区播放| 国产日产精品一区二区三区| 热99re久久免费视精品频软件| 亚洲精品少妇久久久久| 午夜wwwww| 午夜剧场a级免费| 欧洲精品一区二区三区久久| 国产精品一区二区av麻豆| 欧美精品日韩精品| 欧美一区二区性放荡片| 日韩av在线导航| 91午夜精品一区二区三区| 国产一区二区免费在线| av午夜剧场| 欧美大成色www永久网站婷| 亚洲va欧美va国产综合先锋| 日本五十熟hd丰满| 99久久国产综合精品麻豆| 日韩国产不卡| 国产日韩欧美在线影视| 亚洲精品色婷婷| 麻豆天堂网| 6080日韩午夜伦伦午夜伦| 久久婷婷国产香蕉| 少妇av一区二区三区| 91超薄丝袜肉丝一区二区| 6080日韩午夜伦伦午夜伦| av不卡一区二区三区| 91麻豆精品国产综合久久久久久| 午夜电影一区二区三区| 强制中出し~大桥未久在线播放| 99国产精品欧美久久久久的广告| 国产99久久久久久免费看| 国产亚洲精品久久久久秋霞| 国产精品国产三级国产播12软件 | 国产伦精品一区二区三区免费优势 | 国产精品欧美一区二区三区| 激情久久久久久| 欧美乱战大交xxxxx| 一区二区午夜| 99精品国产一区二区三区不卡 | 国产的欧美一区二区三区| 午夜影院激情| 91久久精品国产91久久性色tv| 少妇太爽了在线观看免费| 国产真实一区二区三区| 国产91高清| 国产91电影在线观看| 欧美日韩一区二区电影| 欧美激情在线观看一区| 色妞www精品视频| 国产免费区| 人人澡超碰碰97碰碰碰| 国产精品国产三级国产专区52 | 91精彩刺激对白露脸偷拍| 国91精品久久久久9999不卡| 欧美一区二区三区日本| 欧美片一区二区| 日日噜噜夜夜狠狠| 国产精品乱战久久久| 久久久久久久亚洲国产精品87| 国产亚洲精品精品国产亚洲综合| 91麻豆国产自产在线观看hd| 国产一区免费在线| 欧美大片一区二区三区| 国产精品99一区二区三区| 国产精品国产三级国产专区55 | 欧美国产一区二区三区激情无套| 欧美视屏一区二区| 国产精品香蕉在线的人| 中文字幕天天躁日日躁狠狠躁免费| av午夜在线观看| 国产欧美精品va在线观看| 国产男女乱淫视频高清免费 | 日韩一区二区精品| 91麻豆精品国产91久久久更新资源速度超快 | 免费高潮又黄又色又爽视频| 日本一区二区在线观看视频 | 久久精品欧美一区二区| 午夜黄色网址| 日韩中文字幕亚洲精品欧美|