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: 欧美乱战大交xxxxx| 国语精品一区| 国产精品高潮呻吟88av| 少妇又紧又色又爽又刺激的视频| 狠狠躁夜夜av| 欧洲国产一区| 99久久免费精品国产男女性高好 | 欧美一区二区三区免费视频| 国产精品欧美一区二区三区奶水| 激情aⅴ欧美一区二区三区| 欧美乱码精品一区二区三| 国产区二区| 7799国产精品久久99| 久久精品国产综合| 精品99免费视频| 国内精品久久久久影院日本| 日本午夜一区二区| 久久夜色精品国产亚洲| 亚洲一级中文字幕| 欧美日韩九区| 91一区在线观看| 日韩亚洲精品在线观看| 夜夜夜夜夜猛噜噜噜噜噜gg| 国产清纯白嫩初高生视频在线观看| 性欧美激情日韩精品七区| 日韩精品中文字| 日韩av在线影视| 日本一区二区电影在线观看| 国产极品一区二区三区| 欧美一区二区三区久久精品视| 日韩av在线播| 夜色av网| 中文字幕天天躁日日躁狠狠躁免费| 日本一级中文字幕久久久久久| 午夜剧场伦理| 国产免费一区二区三区四区| 国产精品白浆视频| 国产高清一区在线观看| 午夜av片| 国产影院一区二区| 国产乱人伦精品一区二区三区| 久久99精品久久久噜噜最新章节| 国产欧美亚洲一区二区| 日韩精品乱码久久久久久| 日韩av中文字幕在线| 亚洲国产精品一区在线观看| 国产一a在一片一级在一片| 国产欧美一区二区三区精品观看| 国产二区三区视频| 日本少妇高潮xxxxⅹ| 狠狠色噜噜狠狠狠狠米奇777| 国产区一区| 一色桃子av大全在线播放| 欧美67sexhd| 国产精品一区二区三| 亚洲欧美日韩视频一区| 夜夜夜夜夜猛噜噜噜噜噜gg| 国内揄拍国产精品| 日韩av在线影视| 日韩亚洲精品在线观看| 天干天干天啪啪夜爽爽99| 免费午夜片| 亚洲精品卡一卡二| 欧美午夜理伦三级在线观看偷窥| 亚洲精品少妇一区二区| 国产主播啪啪| 久久99亚洲精品久久99果| 一本色道久久综合亚洲精品图片| 思思久久96热在精品国产| 日韩一级视频在线| 久99精品| 九色国产精品入口| 久久精品视频中文字幕| 91精品久久久久久| 日韩一区二区福利视频| 欧美在线观看视频一区二区| 久久五月精品| 国产精品视频二区不卡| 国产极品美女高潮无套久久久| 国产欧美视频一区二区三区| 精品久久一区| 亚洲国产一区二|