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: 国产一区二区大片| 日韩欧美中文字幕精品| 久久精品一二三四| 91秒拍国产福利一区| 天天干狠狠插| 国产精品v欧美精品v日韩| 亚洲精品中文字幕乱码三区91| 欧美一区二区三区四区五区六区| 午夜剧场伦理| 色噜噜狠狠一区二区| 日韩无遮挡免费视频| 欧美三级午夜理伦三级老人| 91嫩草入口| 国产白丝一区二区三区| 日韩av在线资源| 538国产精品一区二区在线| 国产女人与拘做受免费视频| 二区三区视频| 久久久久国产精品嫩草影院| 国产精品19乱码一区二区三区| 国产清纯白嫩初高生在线播放性色| 国产在线精品二区| 国产精品高潮呻吟久| 国产精品刺激对白麻豆99| 性欧美1819sex性高播放| 99爱精品视频| 久久精品入口九色| 国产精品自拍不卡| 久久亚洲综合国产精品99麻豆的功能介绍 | 九色国产精品入口| 亚洲精品一区,精品二区| 正在播放国产一区二区| 欧美一区二区三区免费看| 欧美精品日韩精品| 国偷自产中文字幕亚洲手机在线| 少妇中文字幕乱码亚洲影视| 麻豆精品国产入口| 欧美国产精品久久| 久久99久久99精品蜜柚传媒| 国产精一区二区三区| 国产91高清| 午夜一区二区三区在线观看| 日韩av免费网站| 少妇中文字幕乱码亚洲影视| 久久夜色精品久久噜噜亚| 久久一级精品| 激情久久一区二区| 伊人av综合网| 国产人澡人澡澡澡人碰视| 精品日韩久久久| 偷拍区另类欧美激情日韩91| 69精品久久| 国语对白一区二区三区| 亚洲精品国产一区| xxxx在线视频| 国产69精品99久久久久久宅男| 国产精品视频1区2区3区| 97久久精品人人做人人爽 | bbbbb女女女女女bbbbb国产| 国产精品久久久久久久久久久杏吧| 久久夜靖品2区| 免费观看xxxx9999片| 国产69精品久久久久app下载| 99精品少妇| 日韩精品一区二区三区免费观看| 日本一区二区在线电影| 免费精品99久久国产综合精品应用| 国产精品入口麻豆九色| 亚洲欧美色图在线| 亚洲国产精品97久久无色| 国产一区免费播放| 日韩av在线导航| 一区二区三区中文字幕| 91一区二区三区久久国产乱| 久久精品综合| 97久久精品人人澡人人爽| 国产亚洲精品久久久久动| 激情欧美日韩| 欧美三区二区一区| 欧美日韩三区二区| 亚洲精品久久久中文| 高清欧美精品xxxxx|