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: 狠狠躁日日躁狂躁夜夜躁av | 91久久香蕉| 窝窝午夜理伦免费影院| 国产精品偷拍| 欧美一区二区精品久久911| 国产69精品久久777的优势| 欧美网站一区二区三区| 日本亚洲国产精品| 亚欧精品在线观看| 亚洲少妇一区二区| 国产在线视频二区| 精品国产免费一区二区三区| 亚洲精品乱码久久久久久按摩| 日韩欧美亚洲视频| 亚洲影院久久| 中文在线√天堂| 亚洲乱强伦| 久久精品综合视频| xxxxx色| 日韩欧美高清一区二区| 国产美女视频一区二区三区| 国产精品v一区二区三区| 欧美视屏一区二区| 色就是色欧美亚洲| 国产二区精品视频| 久久一区二区视频| 色综合久久网| 69xx国产| 国产真实一区二区三区| 欧美日韩精品不卡一区二区三区 | 国产人成看黄久久久久久久久| 久久99精品国产一区二区三区| 精品久久二区| 日韩一级视频在线| 国产一区在线视频观看| 69xx国产| 国产一区二区三区国产| 福利片91| 老女人伦理hd| 97久久久久亚洲| 国产精品6699| 欧洲亚洲国产一区二区三区| 亚洲欧美一区二| 日韩一区二区中文字幕| 国内精品久久久久久久星辰影视 | 欧美日韩亚洲国产一区| 爱看av在线入口| 国产精品久久国产三级国电话系列| 热re99久久精品国99热蜜月| 福利电影一区二区三区| 99久久久国产精品免费调教网站| 日韩亚洲欧美一区二区 | 日本一区二区三区免费视频 | 国产精品一区在线播放| 狠狠色噜噜狠狠狠色综合| 精品少妇一区二区三区| 精品国产精品亚洲一本大道| 99久久精品一区字幕狠狠婷婷| 精品一区二区三区影院| 香蕉视频一区二区三区| 久久精品视频3| 26uuu亚洲国产精品| 91丝袜国产在线观看| 午夜电影天堂| 国产videosfree性另类| 日韩精品一区二区免费| 国产中文字幕91| 亚洲精品久久久久一区二区| 制服.丝袜.亚洲.另类.中文| 日韩一级免费视频| 一区二区三区毛片| 日本一区二区三区免费播放| 国产69精品久久久久999小说| 蜜臀久久99静品久久久久久| 日韩一区二区福利视频| 久久精品中文字幕一区| 欧美日韩国产精品一区二区| 午夜激情影院| 日韩久久精品一区二区三区| 午夜三级电影院| 日本白嫩的18sex少妇hd| 精品中文久久|