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: 国内久久久久久| 狠狠操很很干| 毛片免费看看| 国产精品1234区| 国产在线拍偷自揄拍视频| 日韩av在线网址| 伊人久久婷婷色综合98网| 国产午夜亚洲精品午夜鲁丝片| 国产精品第56页| 久久国产精品波多野结衣| 欧美日本三级少妇三级久久| 久久福利视频网| 国产69精品久久久久9999不卡免费 | 国产亚洲欧美日韩电影网| 国内精品国产三级国产99| 岛国黄色av| 精品国产鲁一鲁一区二区作者| 亚洲日本国产精品| 国产一区午夜| 久久精品国产99| 欧美久久久一区二区三区| 精品少妇一区二区三区| 国产69精品久久久久999天美| 97人人模人人爽视频一区二区 | 大伊人av| 91热精品| 国产91清纯白嫩初高中在线观看 | 国产伦精品一区二区三区免费迷| 国产婷婷色一区二区三区在线| 日韩欧美一区二区在线视频| 欧洲亚洲国产一区二区三区| 中文字幕精品一区二区三区在线| 欧美国产一区二区在线| 超碰97国产精品人人cao| 女女百合互慰av| 国产一区二区影院| 高清人人天天夜夜曰狠狠狠狠| 午夜老司机电影| 伊人精品一区二区三区| 4399午夜理伦免费播放大全| 岛国黄色av| 日韩精品一区二区三区不卡| 91精品第一页| 99久久国产综合精品尤物酒店| 日本道欧美一区二区aaaa| 亚洲精品老司机| 中文字幕一区2区3区| 91精品系列| 精品一区欧美| 欧美一区视频观看| 午夜一级电影| 国产电影一区二区三区下载| 欧美激情片一区二区| 国产精品久久久久久久久久久久久久不卡| 日韩av电影手机在线观看| 国产一区二区播放| 国产精品国产三级国产专区52| 久久国产精品广西柳州门| sb少妇高潮二区久久久久| 午夜天堂电影| 亚洲国产美女精品久久久久∴| 欧美精品综合视频| 奇米色欧美一区二区三区| 玖玖爱国产精品| 国产免费一区二区三区网站免费 | 大伊人av| 蜜臀久久99精品久久一区二区| 免费看农村bbwbbw高潮| 国产免费观看一区| 欧美一区二三区人人喊爽| 国产精品无码专区在线观看| 国产男女乱淫视频高清免费| 窝窝午夜精品一区二区| 国产色婷婷精品综合在线播放| 亚洲精品国产久| 日本高清不卡二区| 国产精品日韩视频| 99精品国产99久久久久久97| 精品国产一区二区三区久久久久久| 国产性猛交96| 91看片app| 精品久久久久久中文字幕|