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: 国产精品一区二区在线观看| 性刺激久久久久久久久九色| 久久久精品免费看| 精品国产一级| 亚洲欧美日本一区二区三区| 久久一二区| 国产在线观看免费麻豆| 久久99久久99精品免观看软件 | 香蕉视频在线观看一区二区| 国产精品9区| 国产午夜亚洲精品午夜鲁丝片| xxxxhd欧美| 国产精品中文字幕一区二区三区| 国产清纯白嫩初高生在线观看性色| 欧美一区二区三区艳史| 狠狠色很很在鲁视频| 欧美福利三区| 国产一区二区电影| 亚洲欧美另类国产| 国产69久久| 国产日韩欧美精品一区| 日本精品一区视频| 日韩夜精品精品免费观看| 99精品小视频| 日本午夜一区二区| 亚洲午夜精品一区二区三区电影院| 综合国产一区| 久久久午夜爽爽一区二区三区三州| 国产亚洲精品精品国产亚洲综合| 欧美精品中文字幕亚洲专区| 538国产精品| 99精品在免费线偷拍| 欧美性猛交xxxxxⅹxx88| 日韩欧美激情| 性色av香蕉一区二区| 亚洲精品一区,精品二区| 国产乱色国产精品播放视频| 婷婷午夜影院| 亚洲欧洲日韩在线| 综合久久色| 国产呻吟久久久久久久92| 国产精品国产三级国产专区53| 国产精品久久久久久久妇女| 精品国产一区二区三区麻豆免费观看完整版| 国产麻豆91视频| 午夜影院啪啪| 国产一区免费在线| 精品国产乱码久久久久久a丨| 国产精品电影免费观看| 男女午夜爽爽| 亚洲精品中文字幕乱码三区91| 91亚洲精品国偷拍自产| 精品视频久| 国产1区2区3区| 国产www亚洲а∨天堂| 国产精品美女久久久另类人妖| 久久国产精品久久久久久电车| 久久一级精品| 午夜看片在线| 亚洲国产日韩综合久久精品 | 欧美一区二区三区久久精品视| 国产一级不卡毛片| 精品国精品国产自在久不卡| 欧美精品六区| 国产一区二区资源| 一区二区精品在线| 欧美系列一区二区| 国产精品九九九九九九九| 91秒拍国产福利一区| 国产在线观看二区| 久久久久亚洲| 欧美一区亚洲一区| freexxxxxxx| 农村妇女精品一区二区| 亚洲免费精品一区二区| 一区二区久久精品| 肥大bbwbbwbbw高潮| 午夜亚洲影院| 在线观看欧美一区二区三区| 久久久一区二区精品| 日本黄页在线观看| 99精品区|