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: 91久久精品在线| 26uuu亚洲国产精品| 国产精品一区二区不卡| 国产精品电影免费观看| 少妇bbwbbwbbw高潮| 欧美3级在线| 国产欧美精品一区二区三区-老狼| 欧美一区二区三区免费看| 国产日韩欧美三级| 久久亚洲精品国产日韩高潮| 日本一区中文字幕| 中文字幕a一二三在线| 福利视频亚洲一区| 国产精品美女一区二区视频| 精品国产乱码久久久久久久| 999亚洲国产精| 午夜国产一区| 久久精品国产99| 国产视频一区二区视频| 九九国产精品视频| 中文字幕在线播放一区| 欧美日本91精品久久久久| 国产精品综合在线观看| 久久国产精品-国产精品| 久久综合久久自在自线精品自| 久久aⅴ国产欧美74aaa| 亚洲神马久久| 欧美freesex极品少妇| 国产精品久久久av久久久| 国产真实一区二区三区| 一区二区三区欧美日韩| 国产精品日产欧美久久久久| 日韩欧美多p乱免费视频| 国产欧美二区| 久久久一区二区精品| 色妞www精品视频| 亚洲欧美日韩另类精品一区二区三区| 国产精品麻豆99久久久久久| 欧美精品在线一区二区| 国产精品丝袜综合区另类| 国产精品久久久久久久久久久不卡| 欧美乱码精品一区二区三| 香蕉久久国产| xxxx18hd护士hd护士| 国产午夜三级一二三区| 欧美日韩国产色综合视频| 亚洲精品国产一区| 国产精品国产三级国产专区51区| 欧美老肥婆性猛交视频| 97人人澡人人添人人爽超碰| 国产午夜精品一区二区三区欧美| 日韩一级片在线免费观看| 97人人模人人爽人人喊38tv| 国产一区免费在线观看| 色一情一交一乱一区二区三区| 久久人做人爽一区二区三区小说| 一区二区在线不卡| 亚洲乱亚洲乱妇28p| 国产一区二区黄| 中文字幕日韩精品在线| 欧美日韩一级在线观看| 日韩精品中文字幕久久臀| 99久久夜色精品国产网站| 精品国产精品亚洲一本大道| 国产精品欧美日韩在线| 99国产精品99久久久久久粉嫩| 久久精品中文字幕一区| 日韩精品中文字幕一区二区| 91九色精品| 日韩女女同一区二区三区| 精品一区欧美| 国产精品电影一区二区三区| 99久久国产综合精品尤物酒店| 精品亚洲午夜久久久久91| 影音先锋久久久| 日本一区中文字幕| 亚洲乱亚洲乱妇50p| 国产精品日产欧美久久久久| 少妇高潮在线观看| 中文无码热在线视频| 久久久久国产精品免费免费搜索| 伊人欧美一区|