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: 美女张开腿黄网站免费| 国久久久久久| 一区二区三区精品国产| 2021天天干夜夜爽| 欧美日韩久久精品| 日本一区二区三区免费在线| 99精品一级欧美片免费播放| av不卡一区二区三区| 国产欧美视频一区二区三区| 国产精品久久亚洲7777| 久久噜噜少妇网站| 中文字幕一区二区三区免费| 中文字幕久久精品一区| 午夜影院伦理片| 国产精品久久久久久久四虎电影| 欧美精品中文字幕亚洲专区| 午夜在线观看av| 96精品国产| 午夜免费一级片| 国产日产精品一区二区三区| 国产一区免费在线| 国产97在线看| 久久综合国产精品| 久99久视频| 国产午夜三级一二三区| 国产午夜精品一区二区理论影院 | 中文乱码字幕永久永久电影| 美国三级日本三级久久99| 午夜精品一区二区三区在线播放| 欧洲激情一区二区| 久久久一二区| 国产麻豆一区二区| 农村妇女精品一二区| 午夜av在线电影| 国产精品乱码久久久久久久久| 国产精品19乱码一区二区三区| 国产伦高清一区二区三区| 久久一区二区三区视频| 4399午夜理伦免费播放大全| 女女百合互慰av| 午夜激情综合网| 三级午夜片| 国产专区一区二区| 免费观看又色又爽又刺激的视频 | 国产一级二级在线| 狠狠色综合欧美激情| 欧美精品久久一区| 久爱精品视频在线播放| 91高清一区| 国产日韩一区二区三免费| 国产精品视频二区三区| 国产精品一区二区中文字幕| 午夜看片网站| 久久国产精品首页| 久久精视频| 日本伦精品一区二区三区免费| 国产精品一区在线播放| 欧美精品一区久久| 17c国产精品一区二区| 国产精品久久久久久久妇女| 国产精品一区二区在线观看免费| 理论片午午伦夜理片在线播放 | sb少妇高潮二区久久久久| 国产资源一区二区| 日韩精品中文字幕一区二区| 5g影院天天爽入口入口| 久久青草欧美一区二区三区| 国产亚洲精品久久777777| 国产精品天堂| 久久久久久久亚洲视频| 国产第一区二区| 欧美精品一区二区三区久久久竹菊| 精品国产区| 欧美日韩国产一区在线| 国产精品1234区| 日韩精品一区在线视频| 国产日韩精品一区二区| 亚洲精品久久久中文| 国产欧美一区二区精品久久| 日韩午夜毛片| 日韩av在线免费电影| 国产精品99在线播放|