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: 国产经典一区二区| 国产69精品久久99的直播节目 | 日本一二三不卡| 午夜电影网一区| 亚洲影院久久| 国产婷婷一区二区三区久久| 中文丰满岳乱妇在线观看| 91精品久| 久免费看少妇高潮a级特黄按摩 | 久久91精品国产91久久久| 国产网站一区二区| 国产欧美综合一区| 午夜情所理论片| 精品婷婷伊人一区三区三| 国产伦理久久精品久久久久| 国产一区二区精品免费| 国产精品久久久久久久综合| 91免费国产| 国产91福利视频| 久久精品国语| 午夜大片网| 强制中出し~大桥未久10| 精品国产18久久久久久依依影院| 欧美一区二区三区免费在线观看| 久久国产精品欧美| 国产日产精品一区二区三区| 午夜影皖精品av在线播放| 在线观看国产91| 国产一二三区免费| 亚洲欧美国产日韩综合| 日韩av不卡一区| 欧美日韩国产综合另类| 日本三级不卡视频| 国产精品久久亚洲7777| 色吊丝av中文字幕| 国产一区网址| 96精品国产| 夜色av网站| 精品国产区一区二| 精品a在线| 97久久精品人人做人人爽50路| 天天射欧美| 亚洲国产精品国自产拍久久| 国产一区二区伦理片| 国产精品免费一区二区区| 亚州精品国产| 亚洲欧美v国产一区二区| 中文字幕欧美一区二区三区| 欧美精品久| 狠狠插狠狠干| 狠狠色综合欧美激情| 国产精品一区在线播放| 欧美日韩一区二区高清| 欧美亚洲精品一区二区三区| 日韩亚洲欧美一区| 999亚洲国产精| 中文字幕一级二级三级| 岛国黄色av| 91国偷自产中文字幕婷婷| 午夜激情影院| 欧美精品一区二区三区在线四季| 日本aⅴ精品一区二区三区日| 亚洲1区2区3区4区| 久久久久久中文字幕| 综合国产一区| 日韩久久电影| 亚洲国产99| 国产日韩欧美不卡| 视频二区一区国产精品天天| 国产第一区在线观看| 日韩精品免费一区| 亚洲精品乱码久久久久久高潮| 国产精品美女久久久免费| 国产资源一区二区三区| 精品亚洲午夜久久久久91| 午夜情所理论片| 三上悠亚亚洲精品一区二区 | av国产精品毛片一区二区小说| 97国产婷婷综合在线视频,| 欧美国产一区二区在线| 欧美精品一区久久| 欧美日本三级少妇三级久久|