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: 国产欧美三区| 91精品啪在线观看国产线免费| 国产大学生呻吟对白精彩在线| 亚洲精品卡一卡二| 人人玩人人添人人澡97| 国产91麻豆视频| 精品一区中文字幕| 国产videosfree性另类| 成年人性生活免费看| 欧美一区二区三区免费电影| 国产九九九精品视频| 亚洲精品一区,精品二区| 国产精品免费自拍| 亚洲va国产2019| 一本色道久久综合亚洲精品浪潮 | 亚洲第一天堂无码专区| 在线国产二区| 91国产在线看| 久久精品国语| 99精品视频一区| 欧美一区二三区| 狠狠色噜噜狠狠狠狠综合久| 日韩av不卡一区| 一区二区三区四区视频在线| 制服丝袜二区| 少妇bbwbbwbbw高潮| 国产二区视频在线播放| 久久精品视频一区二区| 亚洲乱在线| 日本高清不卡二区| 久久久久亚洲| 国产日韩一区二区在线| 国产天堂一区二区三区| 日韩av片无码一区二区不卡电影| 91av精品| 91国偷自产一区二区介绍| 欧美一区二区三区国产精品| 国产精品日韩电影| 香港三日三级少妇三级99| 丰满岳乱妇在线观看中字| 久久一二区| 午夜免费一级片| 日韩一区免费在线观看| 免费观看黄色毛片| 欧美日韩一级在线观看| 国产精品自拍在线观看| 国产日韩欧美另类| 日韩精品乱码久久久久久| 亚洲精品久久久久久动漫| 久草精品一区| 99国产精品丝袜久久久久久| 欧美片一区二区| 免费视频拗女稀缺一区二区| 中文乱码字幕永久永久电影| 日本高清二区| 国产一级片一区二区| 欧美一区二区三区精品免费| 国产日韩欧美精品| 欧美极品少妇videossex| 一区二区久久精品| 性国产日韩欧美一区二区在线| 国产日产欧美一区二区| 亚洲第一天堂无码专区 | 综合久久色| 久久精品国产色蜜蜜麻豆| 欧美一区二区三区久久综合| 夜夜躁日日躁狠狠久久av| 国产精品人人爽人人做av片| 女女百合互慰av| 日韩精品中文字幕一区二区| 日韩av在线网址| 精品国产区| 在线亚洲精品| 亚洲激情中文字幕| 亚洲欧美日韩精品suv| 91久久精品在线| 久久第一区| 久热精品视频在线| 国产精品久久久久99| 欧美激情在线免费| 欧美精品国产一区二区| 国产午夜精品一区二区三区视频|