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: 国产一区第一页| 国产精品亚洲二区| 满春阁精品av在线导航| 久草精品一区| 高清人人天天夜夜曰狠狠狠狠| 高清欧美精品xxxxx| 国产精品视频久久| 国语对白一区二区| 国产精品免费专区| 99视频国产在线| 国产精品精品国内自产拍下载| 狠狠色噜噜狠狠狠狠69| 国产极品一区二区三区| 国产精品国产三级国产aⅴ下载| 国产一区在线免费| 欧美高清视频一区二区三区| 国产精品偷伦一区二区| 欧美极品少妇| 国产欧美日韩中文字幕| 国产乱码一区二区三区| 日韩欧美中文字幕一区| 九一国产精品| 中文乱码字幕永久永久电影| 欧美精品八区| 国产一区亚洲一区| 欧美一区二区三区久久| 狠狠综合久久av一区二区老牛| 91黄在线看| 国产欧美日韩精品一区二区三区| 欧美日韩一级二级三级| 国产原创一区二区 | 中文字幕一区二区三区免费| 久久精品国产久精国产| 999亚洲国产精| 国产精品视频十区| 91一区二区三区在线| 91久久一区二区| 伊人欧美一区| а√天堂8资源中文在线| 国产黄一区二区毛片免下载| 欧美精品xxxxx| 激情久久一区| 国产精品免费观看国产网曝瓜| 亚洲精品久久久久一区二区| 91国偷自产一区二区介绍| 中文字幕制服狠久久日韩二区| 欧美一区二区三区免费在线观看| 亚洲精品一区二区三区香蕉| 国产精品免费自拍| 99久久精品免费看国产交换| 国产第一区在线观看| 国产一区二区在线免费| 日本中文字幕一区| 99精品小视频| 精品视频久| 午夜天堂在线| 国产1区在线观看| 精品日韩久久久| 亚洲午夜国产一区99re久久| 国产精品乱码一区| 91社区国产高清| 夜夜精品视频一区二区| 国产精一区二区三区| 午夜看片网| 91日韩一区二区三区| 美国三级日本三级久久99| 日韩欧美高清一区| 岛国黄色网址| 亚洲精品人| 国产69精品久久久久app下载| 亚洲久久在线| 亚洲欧洲日韩av| 国产无遮挡又黄又爽又色视频| 久久99亚洲精品久久99| 激情久久久久久| 国产精华一区二区精华| 国产欧美日韩一级| 亚洲久色影视| 久久国产中文字幕| av午夜在线观看| 挺进警察美妇后菊| 精品国产九九|