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hdfree性xxxx| 国产视频二区在线观看| 国产一区在线免费| 欧美一区二区三区免费观看视频| 综合在线一区| 国产午夜三级一二三区| 91午夜在线观看| 日韩精品一区二区三区在线 | 精品久久久影院| 国产一区二区大片| 欧美精品六区| 日韩欧美中文字幕精品| 欧美亚洲精品一区二区三区| 国产精品二十区| 国产精品久久久久久久久久久久久久久久久久| 欧美精品日韩精品| 26uuu色噜噜精品一区二区| 国产在线不卡一| 麻豆精品国产入口| 日本丰满岳妇伦3在线观看| 国产一区二| 亚洲国产欧美一区二区三区丁香婷| 狠狠色噜噜狠狠狠色综合| 国产无套精品久久久久久| 夜夜夜夜夜猛噜噜噜噜噜gg| 国产在线欧美在线| 日本神影院一区二区三区| 一区二区三区欧美在线| 国产黄一区二区毛片免下载| 19videosex性欧美69| 日韩一区二区精品| 免费a级毛片18以上观看精品| 国产韩国精品一区二区三区| 日韩精品久久久久久中文字幕8| 亚洲精品97久久久babes| 日韩一级免费视频| 狠狠色狠狠色综合久久第一次| 国产二区精品视频| 国产麻豆精品久久| 国产一区欧美一区| 欧美一区二区在线不卡| 国久久久久久| 亚洲欧美国产中文字幕| 国产精品1区二区| 秋霞av电影网| 丰满少妇在线播放bd日韩电影| 97人人模人人爽人人喊0| 国产日韩欧美视频| 欧美二区精品| 国产一区二区四区| 欧美一区二区精品久久| 亚洲精品老司机| av午夜在线| 香蕉久久国产| xxxxhdvideosex| 少妇自拍一区| 国产精品乱码一区| 日韩中文字幕一区二区在线视频| 日韩精品免费播放| 久久精品国产99| 国产欧美一区二区在线| 欧美hdxxxx| 性欧美精品动漫| 午夜亚洲国产理论片一二三四| 日韩亚洲欧美一区二区 | 欧美乱妇高清无乱码免费| 销魂美女一区二区| 久久久久久亚洲精品| 91香蕉一区二区三区在线观看| 精品国产鲁一鲁一区二区三区| 日韩一级精品视频在线观看 | 大伊人av| 91麻豆精品国产91久久久资源速度 | 国内精品国产三级国产99| 色婷婷精品久久二区二区6| 欧美日韩卡一卡二| 久久精品综合| 高清人人天天夜夜曰狠狠狠狠| 亚洲欧洲日韩在线| 一色桃子av| 亚洲欧美制服丝腿| 国产理论一区|