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: 国产视频二区| 99精品久久99久久久久| 99re久久精品国产| 精品国产乱码久久久久久虫虫| 日韩精品一区三区| 999国产精品999久久久久久| 国产一二三区免费| 一区二区三区日韩精品| www.成| 国产91免费观看| 国产亚洲精品久久19p| 欧美性xxxxx极品少妇| 少妇特黄v一区二区三区图片| 欧美一区二区三区久久久久久桃花 | 欧美在线观看视频一区二区三区| 日本高清h色视频在线观看| 蜜臀久久久久久999| 性old老妇做受| 91精品久久久久久久久久| 欧美视屏一区| 国产69精品久久久久777糖心| 强行挺进女警紧窄湿润| 亚洲福利视频二区| 日韩av在线影视| 国语对白老女人一级hd| 国产日韩欧美不卡| 国产欧美日韩精品一区二区图片| 亚洲w码欧洲s码免费| 国产老妇av| 亚洲精品456在线播放| 国产精品9区| 亚洲福利视频一区| 国产欧美日韩中文字幕| 国产精品天堂| 欧美日韩中文字幕三区| 午夜激情在线免费观看| 久久天天躁狠狠躁亚洲综合公司| 一本一道久久a久久精品综合蜜臀| 色婷婷久久一区二区三区麻豆 | 亚洲欧美日本一区二区三区| 亚洲午夜久久久久久久久电影院| 欧美乱码精品一区二区三| 老太脱裤子让老头玩xxxxx| 国产精品久久久久99| 超碰97国产精品人人cao| 欧美乱妇高清无乱码| 国精偷拍一区二区三区| 91高清一区| 国产伦精品一区二区三区免费观看| 欧美精品日韩| 欧美精品xxxxx| 99精品视频免费看| 国产一区二区二| 福利片一区二区三区| 91一区二区三区久久国产乱 | 国产精品视频1区2区3区| 欧美精品综合视频| 色偷偷一区二区三区| 亚洲一二三在线| 欧美激情在线观看一区| 精品福利一区| 99爱国产精品| 国产伦精品一区二区三区免费观看| 亚洲午夜精品一区二区三区电影院| 国产精品久久国产精品99| 亚洲精品无吗| 国产精品视频一二区| 欧美激情视频一区二区三区| 一区二区三区四区视频在线| 欧美三区视频| 国产不卡一二三区| 亚洲国产aⅴ精品一区二区16| 日本精品视频一区二区三区| 国产偷窥片| 97久久国产精品| 国产精品高清一区| 狠狠插影院| 日本一级中文字幕久久久久久| 鲁丝一区二区三区免费| 日韩中文字幕区一区有砖一区| 国产电影精品一区| 日本高清h色视频在线观看|