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: 电影午夜精品一区二区三区| 色综合久久88| 国产午夜精品一区理论片飘花| 日本美女视频一区二区| 国产伦理精品一区二区三区观看体验| 国产aⅴ一区二区| 欧美日韩亚洲国产一区| 亚洲精品国产一区| 国产一区二区伦理片| 色乱码一区二区三区网站| 一区二区三区香蕉视频| 久久不卡精品| av午夜剧场| 在线精品视频一区| 99久久精品免费看国产交换| 亚洲欧美日韩三区| 国产精品天堂网| 69久久夜色精品国产69乱青草 | 国产精品自拍在线| 国产农村乱色xxxx| 久久第一区| 国产aⅴ一区二区| 国产日韩欧美一区二区在线播放| 欧美一区二区三区不卡视频| 99精品黄色| 天天干狠狠插| 国产高清在线观看一区| 欧洲精品一区二区三区久久| 一本一道久久a久久精品综合蜜臀| 欧美日韩国产91| 国产黄一区二区毛片免下载| 亚洲福利视频一区| 亚洲国产精品第一区二区| 日本一二区视频| 68精品国产免费久久久久久婷婷 | 日韩av在线网| 国产午夜一区二区三区| 97久久超碰国产精品| 欧美日韩国产午夜| 国产精品网站一区| 午夜激情在线免费观看| 亚洲精品国产精品国自| 国产精品视频免费一区二区| 欧美精品一区二区久久| 91精品国产综合久久国产大片| 国产精品一区二区在线看| 亚洲欧美国产一区二区三区| 国产视频一区二区不卡| 国产精品一级在线| 国产婷婷色一区二区三区在线| 欧美xxxxhdvideos| 国产三级国产精品国产专区50| 99精品黄色| 欧美一区二区三区四区在线观看| 久久免费视频一区| 欧美日韩卡一卡二| 少妇高清精品毛片在线视频| 日本一区二区三区免费在线| 一区二区三区精品国产| 亚洲三区二区一区| 国产麻豆91欧美一区二区| 国产一区二区伦理| www色视频岛国| 精品少妇一区二区三区| 国产精品一区二区免费视频| 欧美视频1区| 国产精品视频二区不卡| 又黄又爽又刺激久久久久亚洲精品 | 欧美系列一区| 国产精品白浆一区二区| 国产婷婷一区二区三区久久| 狠狠躁天天躁又黄又爽| 亚洲国产精品精品| 国产一区二区精品在线| 中文字幕一区二区三区乱码| 日本精品一二区| 国产欧美一区二区三区沐欲| 国产精品一区不卡| 久久黄色精品视频| 国产91一区二区在线观看| 精品国产一二区| 欧美一区二区三区久久久精品 |