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: 国产欧美亚洲精品| 国产精品96久久久| sb少妇高潮二区久久久久| 欧美日韩中文字幕三区| 日韩精品中文字幕久久臀| 日本一区中文字幕| 国产九九影院| 91久久精品国产91久久性色tv| 欧美日韩国产一区二区三区在线观看| 精品国产九九九| 亚洲国产一区二区精华液| 欧美日韩一区免费| 日本美女视频一区二区三区| 欧美一区二区激情三区| 国产一区二区三级| 亚洲欧美中日精品高清一区二区| 国产69精品99久久久久久宅男| 日韩av电影手机在线观看| xxxxx色| 色婷婷综合久久久中文一区二区| 91社区国产高清| 久久精品欧美一区二区| 91麻豆精品国产自产欧美一级在线观看| 久久精品视频中文字幕| 麻豆视频免费播放| 日韩av在线资源| 久精品国产| 国产乱对白刺激视频在线观看| 在线亚洲精品| 午夜av片| 国产精品美女一区二区视频| 国产精品一二三区免费| 国产原创一区二区| 免费看农村bbwbbw高潮| 国产精品久久久久久久久久久久冷| 国产色午夜婷婷一区二区三区| 91精品国产综合久久婷婷香| 亚洲精品一品区二品区三品区| 91精品一区二区中文字幕| 美女脱免费看直播| 亚洲精品国产精品国自产网站按摩| 大bbw大bbw巨大bbb| 国产精品色婷婷99久久精品| 国产色99| 亚洲午夜精品一区二区三区| 中文字幕理伦片免费看| 色综合久久综合| 国产在线视频二区| 免费观看xxxx9999片| 亚洲精品日韩在线| 久久综合狠狠狠色97| 96精品国产| 精品国产区一区二| 国产精品乱战久久久| 日日噜噜夜夜狠狠| 日韩精品乱码久久久久久| 李采潭无删减版大尺度| 国产精品视频二区不卡| 欧美一区二区精品久久| 午夜电影天堂| 欧美午夜看片在线观看字幕| 波多野结衣女教师30分钟| 国产91视频一区二区| 狠狠色很很在鲁视频| 国产午夜精品免费一区二区三区视频| 狠狠色丁香久久婷婷综| 国产色婷婷精品综合在线播放| 亚洲欧美日韩视频一区| 国产一区二区三区精品在线| 精品国产一区二区三区四区vr| 好吊妞国产欧美日韩免费观看网站 | 亚洲国产一区二区精华液| 国产一区二区91| 日韩一级片免费观看| 国产精品久久久久久久久久久久久久久久久久| 午夜免费av电影| 国产精华一区二区精华| 亚洲国产一区二区精华液| 日韩av不卡一区| 欧美日韩三区| 国产亚洲精品久久久久久网站| 亚洲精品日本久久一区二区三区|