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: 午夜裸体性播放免费观看| 一本大道久久a久久精品| 国产馆一区二区| 久久密av| 欧美精品xxxxx| 7777久久久国产精品| 国产日韩一二三区| 久久天天躁狠狠躁亚洲综合公司| 国产馆一区二区| 自拍偷在线精品自拍偷无码专区| 日本亚洲国产精品| av午夜影院| 国产资源一区二区三区| 狠狠躁夜夜躁xxxxaaaa| 久久免费视频一区二区| 国语对白老女人一级hd| 国产二区视频在线播放| 欧美一区二区在线不卡| 欧美一级片一区| 91精品福利观看| 亚洲欧美日本一区二区三区 | 欧美激情国产一区| 精品久久久久久中文字幕大豆网| 国产aⅴ一区二区| 亚州精品国产| 97香蕉久久国产超碰青草软件| av午夜影院| 亚洲精品国产suv| 羞羞视频网站免费| 亚洲一区二区三区加勒比| 久久九九亚洲| 国产无套精品一区二区| 精品日韩久久久| 99精品国产一区二区三区不卡 | 欧美精品综合视频| 国产91一区二区在线观看| 国产一区日韩一区| 亚洲精品久久久久一区二区| 又黄又爽又刺激久久久久亚洲精品| 色噜噜狠狠色综合影视| 亚洲国产精品97久久无色| 九九国产精品视频| 国产精品女同一区二区免费站| 7777久久久国产精品| 国产精品偷拍| 97午夜视频| 欧美一区二区三区爽大粗免费| 色综合欧美亚洲国产| 久久96国产精品久久99软件| 国产伦精品一区二| 欧美三区视频| 午夜av电影院| 日韩欧美激情| 人人澡超碰碰97碰碰碰| 韩国视频一区二区| 国产91免费在线| 99精品国产一区二区三区不卡| 亚洲二区在线播放视频| 性色av色香蕉一区二区| 国产高清一区在线观看| freexxxxxxx| 国产乱人伦精品一区二区三区| 国产目拍亚洲精品区一区| 免费a级毛片18以上观看精品 | 少妇高潮在线观看| 久久乐国产精品| 国产一区2| 亚洲网站久久| 国产一区二区三区黄| 96精品国产| 欧美在线视频一二三区| 久久久精品99久久精品36亚| xxxx18hd护士hd护士| 国产在线精品区| 午夜av在线电影| 国产高清一区在线观看| 97人人模人人爽人人喊小说 | 国产午夜三级一二三区| 久久久精品欧美一区二区免费| 欧美高清xxxxx| 欧美日韩国产在线一区| xxxx18日本护士高清hd|