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: 老女人伦理hd| 亚洲欧美中日精品高清一区二区| 强行挺进女警紧窄湿润| 三级视频一区| 国产片91| 最新av中文字幕| 神马久久av| 久久免费视频一区二区| 亚洲三区二区一区| 99久久夜色精品| 日韩av三区| 国产69精品久久久久久野外| 视频一区二区国产| 国产在线视频二区| 国产91电影在线观看| 久久99精品一区二区三区| 国产人成看黄久久久久久久久| 欧美一区二区性放荡片| 免费精品一区二区三区视频日产| 亚洲精品乱码久久久久久麻豆不卡| 少妇高潮一区二区三区99小说| 日本高清h色视频在线观看| 国产91在| 国产精品对白刺激在线观看| 久久精品爱爱视频| 日韩精品一区二区不卡| 99久久免费精品国产男女性高好| 日韩精品免费看| 亚洲精品www久久久久久广东| 国产电影一区二区三区下载| 日韩精品久久一区二区三区| 91久久国产露脸精品国产护士| 国产1区2区3区| 中文天堂在线一区| 日韩av在线网| 欧美日韩亚洲国产一区| 久久精品综合| 免费午夜片| 日韩精品一区三区| 国产精品白浆视频| 国产1区2区3区| 国产精品videossex国产高清| 国产乱码精品一区二区三区中文| 精品一区二区三区视频?| 中出乱码av亚洲精品久久天堂| 日韩一级精品视频在线观看 | 亚洲国产偷| 日韩精品999| 欧美777精品久久久久网| 久久99精品久久久秒播| 一区二区三区欧美在线| 日韩av在线电影网| 欧美精品八区| 国产一级片子| 国产亚洲精品久久久久久网站| 年轻bbwbbw高潮| 国产精品自产拍在线观看蜜| 午夜剧场伦理| 日韩毛片一区| 日本护士hd高潮护士| 999久久久国产| 国产精品日韩三级| 国产又黄又硬又湿又黄| 欧美日韩久久精品| 99er热精品视频国产| 国产精品一二三四五区| 国产精选一区二区| 黄色香港三级三级三级| 国产在线干| 国产一区二区四区| 亚洲五码在线| 久久亚洲精品国产日韩高潮| 国产精品免费一视频区二区三区| 国产一区二区三区大片| 欧美精品一卡二卡| 中文乱码字幕永久永久电影| 狠狠色狠狠色很很综合很久久| 国产午夜亚洲精品午夜鲁丝片| 国产欧美一二三区| 精品一区中文字幕| 国产一区2区3区| 精品一区二区超碰久久久|