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: 99热久久这里只精品国产www| 91精品国模一区二区三区| 最新国产精品自拍| 欧美资源一区| 亚洲制服丝袜在线| 亚洲码在线| 国产精品二区一区二区aⅴ| 99精品国产99久久久久久97| 国产欧美二区| 国产精品伦一区二区三区在线观看| 国产丝袜一区二区三区免费视频 | 99国产精品永久免费视频| 午夜电影一区| 亚洲精品卡一卡二| 99精品久久久久久久婷婷| 午夜影院一区| 午夜肉伦伦| 亚洲午夜久久久久久久久电影院| 国产精品久久久久久久久久久久久久不卡 | 制服.丝袜.亚洲.另类.中文| 国模精品免费看久久久| 少妇厨房与子伦在线观看| 亚洲欧美日韩在线看| 国产一区二区三区四| 国产日韩欧美一区二区在线观看 | 欧美日韩国产123| 国产精品久久久麻豆| 国产精品美女久久久另类人妖| 国产精品久久久区三区天天噜| 中文字幕1区2区3区| 精品国产一区二区三区麻豆免费观看完整版 | 国产精品一区二区三| 国产精品日产欧美久久久久| 欧美老肥婆性猛交视频| 美女销魂免费一区二区| 久久激情综合网| 欧美一区二区三区免费看| 国产欧美一区二区三区免费| 国模少妇一区二区三区| 欧美日韩激情在线| 国产欧美日韩另类| 亚洲国产精品一区二区久久,亚洲午夜| 欧美精品免费视频| 色婷婷综合久久久久中文| 欧美一区二区三区激情| 欧美乱大交xxxxx古装| 精品无人国产偷自产在线| 国产一级片一区| 国产在线拍偷自揄拍视频| 玖玖国产精品视频| 国产1区2区3区| 亚洲女人av久久天堂| 欧美老肥婆性猛交视频| 99久久精品国| 色综合久久88| 视频一区二区三区欧美| 久精品国产| 国产欧美精品一区二区三区小说| 中文字幕区一区二| 国产999精品久久久久久绿帽| 99久久精品免费看国产交换| 色一情一交一乱一区二区三区| 99久久久国产精品免费无卡顿| 97人人模人人爽人人喊38tv| 亚洲国产日韩综合久久精品| 26uuu亚洲国产精品| 欧美乱大交xxxxx胶衣| 一区二区久久精品66国产精品| 午夜av片| 亚洲精品丝袜| 国产精品视频久久久久| 欧美大成色www永久网站婷| 午夜色大片| 国产乱色国产精品播放视频| 久久久久国产精品免费免费搜索| 久久青草欧美一区二区三区| 国产二区免费| 久久99精品久久久秒播| 欧美日韩久久一区二区| 91久久国产露脸精品国产护士| 欧美一区二区三区四区在线观看| 91精品婷婷国产综合久久竹菊 |