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: 国产亚洲精品综合一区 | 日韩av不卡一区二区| 国产在线观看免费麻豆| 午夜特片网| 国产精品视频1区2区3区| 99久久精品免费看国产免费粉嫩 | 亚洲精品久久久久999中文字幕| 欧美一区久久久| 日韩欧美国产高清91| 国产日韩精品一区二区三区| 国产在线欧美在线| 国产精品美女久久久免费| 久久激情综合网| 国产精品久久久久久久久久软件| 久久精品国产一区二区三区| 亚洲精品www久久久久久广东| 免费xxxx18美国| 国产乱码一区二区| 亚洲欧美色图在线| 国产91在线拍偷自揄拍| 国产精品日韩电影| 性夜影院在线观看| 国产精品自产拍在线观看蜜| 欧美乱偷一区二区三区在线| 国产精品v一区二区三区| 96国产精品| 欧美日韩一区二区三区69堂| 国产一级大片| 狠狠操很很干| 99精品久久久久久久婷婷| 国产亚洲精品久久午夜玫瑰园| 国产黄色网址大全| 国产亚洲精品久久网站| 欧美一级久久精品| 中文字幕日韩一区二区| 亚洲精品乱码久久久久久蜜糖图片| 国产一区在线免费观看| 日韩夜精品精品免费观看| 狠狠色很很在鲁视频| 国产中文字幕91| 狠狠躁日日躁狂躁夜夜躁av | 久久99久国产精品黄毛片入口 | 久久网站精品| 国产91热爆ts人妖在线| 久久黄色精品视频| 亚洲网站久久| 国产乱对白刺激视频在线观看| 天干天干天干夜夜爽av| 丰满少妇高潮惨叫久久久| 欧美日韩一区二区三区四区五区六区| 日韩中文字幕在线一区二区| 日本福利一区二区| 亚洲国产精品激情综合图片| 欧美日韩三区| 国产一区二区手机在线观看| 亚洲s码欧洲m码在线观看| 国产精品综合在线| 国产在线精品一区二区在线播放| 一区二区精品久久| 欧美日韩卡一卡二| 99精品久久久久久久婷婷| 国产精品一区二区av日韩在线| 国产偷国产偷亚洲清高| 国产日本欧美一区二区三区| 国产91精品一区| 日韩一区免费在线观看| 久久97国产| 欧美日韩国产色综合视频 | 国产真实一区二区三区| 亚洲精品国产久| 欧美日韩国产精品综合| 国产日韩欧美亚洲| 国产精一区二区| 国产精品国产三级国产专播精品人| 激情久久一区| 国产精品三级久久久久久电影| 国产免费区| 日韩欧美国产高清91| 国产盗摄91精品一区二区三区| 欧美一区二区三区四区夜夜大片 | 免费久久99精品国产婷婷六月| 国产日韩欧美三级|