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: 色婷婷综合久久久久中文| 亚洲欧美一二三| 强行挺进女警紧窄湿润| 国产欧美一区二区三区在线| 99热一区二区| 国产精品日韩电影| 亚洲一二三四区| 欧美日韩国产区| 欧美午夜理伦三级在线观看偷窥 | 99精品一区二区| 97精品国产97久久久久久免费| 国产aⅴ精品久久久久久| 日本二区在线播放| 国产精品一区二区免费视频| 91狠狠操| 精品久久久影院| 国产精品1234区| 欧美日本三级少妇三级久久| 高清人人天天夜夜曰狠狠狠狠| 久久精品国产一区二区三区| 欧美乱妇在线视频播放| 国产精品v亚洲精品v日韩精品| 国产视频1区2区| 欧美一区二区三区免费视频| 在线观看黄色91| 精品一区电影国产| 亚洲精品少妇久久久久| 国产全肉乱妇杂乱视频在线观看| 欧美一区二区三区激情视频| 国产盗摄91精品一区二区三区| 亚洲高清久久久| 欧美一级片一区| 国产91九色视频| 国产精品一区二区三| 国产一区二区中文字幕| 久久一区二区视频| 国产午夜三级一区二区三| 亚洲国产视频一区二区三区| 午夜免费一级片| 91久久精品在线| 偷拍精品一区二区三区| 高清欧美xxxx| 久久99久国产精品黄毛片入口| 国产清纯白嫩初高生在线播放性色 | 国产伦精品一区二区三区免费下载 | 久久久精品免费看| 欧美日韩一区电影| 日韩女女同一区二区三区| 97人人模人人爽视频一区二区| 在线观看黄色91| 91区国产| 中文字幕区一区二| 午夜黄色一级电影| 国产精品v欧美精品v日韩| 日韩精品一区在线视频| 欧美一区久久久| 欧美国产一二三区| 亚洲精品久久久久中文第一暮| 日韩精品一区二区三区四区在线观看 | 国产原创一区二区| 久久人人爽爽| 一本色道久久综合亚洲精品浪潮| 一区二区三区电影在线观看| 欧美3级在线| 国产99视频精品免费视频7 | 国产二区三区视频| 久爱精品视频在线播放| 国产一级片大全| 国产精品免费一区二区区| 国产精品一区二区不卡| 91av精品| 国产欧美三区| 午夜wwww| 国产精品视频二区三区| 日本午夜一区二区| 色噜噜狠狠狠狠色综合久| 国产伦高清一区二区三区| 日韩精品一区二区不卡| 国产午夜精品免费一区二区三区视频| 欧美在线精品一区| 国产欧美性| 久久夜色精品久久噜噜亚|