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: 国产精品爽到爆呻吟高潮不挺| 欧美大片一区二区三区| 国产天堂第一区| 日韩精品一区二区久久| 8x8x国产一区二区三区精品推荐| 国产精选一区二区| 久久噜噜少妇网站| 91人人爽人人爽人人精88v| 亚洲欧美日韩三区| 7799国产精品久久99| 久久噜噜少妇网站| 一区不卡av| 一区二区久久久久| 69xx国产| 日韩精品免费一区二区在线观看| 国产精品视频1区| 午夜大片网| 国内少妇偷人精品视频免费| 亚洲欧美一二三| 中文乱码字幕永久永久电影| 久久天天躁狠狠躁亚洲综合公司| 国产免费一区二区三区四区五区| 国产精品欧美日韩在线| 国产女性无套免费看网站| 福利片一区二区三区| 日韩中文字幕在线一区二区| 久久中文一区| 国产高清不卡一区| 午夜电影天堂| 日韩一级片免费视频| 国产一区二区三区黄| 性色av色香蕉一区二区| 伊人欧美一区| 久久久精品观看| 欧美在线观看视频一区二区三区| 国产精品综合久久| 午夜影院你懂的| 99久久久国产精品免费无卡顿| 99欧美精品| 亚洲欧美日韩国产综合精品二区| 精品国产乱码久久久久久软件影片| 国产日韩欧美视频| 日本午夜影视| 右手影院av| 国产在线精品一区| 91麻豆产精品久久久| 欧美乱大交xxxxx古装| 黄色国产一区二区| 精品久久久久久久久亚洲| 销魂美女一区二区| 精品国产乱码久久久久久软件影片| 日本一二三区电影| 久久艹国产精品| 国产亚洲精品久久久久久久久动漫| 一本色道久久综合亚洲精品图片| 国产精品1234区| 欧美一区二区三区久久精品视| 国产精品久久久不卡| 国产一区二区精品在线| 国产69精品久久久久999小说| 毛片大全免费观看| 亚洲国产偷| 日韩精品一区二区三区在线| 欧美在线一区二区视频| 一区二区三区国产精品视频| 亚洲精品国产setv| 欧美日韩国产影院| 91在线一区| 91黄色免费看| 国产一区二区三区影院| 日韩国产不卡| 国产高清无套内谢免费| 挺进警察美妇后菊| 人人要人人澡人人爽人人dvd| 国产在线一区二区视频| 欧美日韩精品在线播放| 精品91av| 欧美一区二区三区艳史| 免费午夜片| 色偷偷一区二区三区| 99国产伦精品一区二区三区 | 国产一区二区在|