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: 狠狠躁夜夜| 国产精品国外精品| 国产一区精品在线观看| 日韩精品久久一区二区三区| 日韩夜精品精品免费观看| 色一情一乱一乱一区免费网站| 四虎久久精品国产亚洲av| 久久99亚洲精品久久99| 久精品国产| 91麻豆精品国产自产欧美一级在线观看 | 亚洲国产一区二区精华液| av狠狠干| 欧美一区二区三区久久| 国产91在| 国产精品欧美一区二区视频| 91精品一区二区在线观看| 国产在线精品二区| 国产精品1区二区| 亚洲精品一区中文字幕| 欧美精品国产一区| 538国产精品| 欧美日韩一级在线观看| 欧美日韩一区不卡| 国产一区=区| 精品a在线| 欧美67sexhd| 国产精品一区二区久久乐夜夜嗨| 国产性猛交xx乱| 国产欧美一区二区三区免费看| 国产伦精品一区二区三区电影| 欧美精品一区二区三区久久久竹菊| 国产剧情在线观看一区二区| 日韩中文字幕在线一区二区| 亚洲国产精品入口| 久久久久久久久亚洲精品| 久久九九亚洲| 国产日韩欧美在线一区| 欧美性猛交xxxxxⅹxx88| 亚日韩精品| 国产精品一区二区日韩新区| 欧美在线观看视频一区二区三区| 欧美3p激情一区二区三区猛视频| av中文字幕一区二区| 中文字幕在线视频一区二区| 国产一区三区四区| 一级午夜影院| 丰满少妇高潮惨叫久久久一| 亚洲国产一区二区精华液| 久久国产精品久久| 亚洲va欧美va国产综合先锋| 欧美日韩中文不卡| 538国产精品| 国产又黄又硬又湿又黄| 欧洲亚洲国产一区二区三区| 国产精品久久国产精品99| 国产精品黑色丝袜的老师| 国产精品国产三级国产aⅴ下载| 日本一区二区三区中文字幕| 亚洲国产精品日本| 久久九精品| 国产区二区| 亚洲欧美一卡二卡| 国产精品美女www爽爽爽视频| 女女百合互慰av| 欧美精品一区二区三区视频| 制服丝袜亚洲一区| 91久久香蕉| 国产精品一区在线观看你懂的| 久久久久亚洲最大xxxx| 国产一区二| 国产一区二区三区四| 国产偷自视频区视频一区二区| 国产二区免费| 日韩欧美高清一区| 欧美激情视频一区二区三区免费| 欧美激情午夜| 69久久夜色精品国产7777| 国产91麻豆视频| 色综合久久88| 国产一区二区三区四区五区七| 性国产日韩欧美一区二区在线| 美国三级日本三级久久99|