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: 亚洲精品久久久久999中文字幕 | 一区二区三区中文字幕| 久久久久久中文字幕| 欧美日韩一区二区三区在线播放| 国内精品久久久久久久星辰影视| 国产精品高潮呻吟三区四区| 国产精品视频一区二区在线观看 | 欧美一区亚洲一区| 亚洲天堂国产精品| 欧美视屏一区二区| 爽妇色啪网| 99精品国产一区二区三区麻豆| 亚洲福利视频一区| 粉嫩久久久久久久极品| 久久久久久久亚洲国产精品87| 欧美网站一区二区三区| 999久久久国产| 亚洲va欧美va国产综合先锋| 国产午夜精品一区二区三区欧美 | 一区二区三区国产视频| 91秒拍国产福利一区| 狠狠插狠狠干| 久久久久久国产精品免费| 日韩一区免费| 国产日韩精品一区二区三区| 午夜性电影| 久久久午夜爽爽一区二区三区三州| 性色av色香蕉一区二区| 国产精品一区在线观看| 91免费看国产| 99精品视频一区| 国精偷拍一区二区三区| 91看片免费| 亚洲三区在线| 国产一区二区三级| 91久久国产视频| 欧美日韩一区二区三区69堂| 亚洲国产精品97久久无色| 亚洲精品日本无v一区| 国产理论一区| 国产精品视频久久| 日本一二三区视频在线| 91精品啪在线观看国产手机| 国产专区一区二区| 91香蕉一区二区三区在线观看| 日本一区午夜艳熟免费| 中文字幕a一二三在线| 国产一区www| 国产午夜一级一片免费播放| 国产91免费在线| 国产日韩欧美视频| 99re热精品视频国产免费| 欧美777精品久久久久网| 97久久精品人人澡人人爽| 欧美一区二区三区黄| 天堂av色婷婷一区二区三区| 夜夜嗨av禁果av粉嫩av懂色av| 亚洲精品少妇一区二区 | 国产日韩欧美综合在线| 91精品黄色| 日韩精品一二区| 国产精品亚发布| 99精品欧美一区二区三区美图| 大伊人av| 国产伦精品一区二区三区四区| 国产精品网站一区| 国产欧美一区二区三区在线播放| 91国产一区二区| 97人人模人人爽人人喊小说| 精品中文久久| 91久久精品在线| 国产欧美三区| 久久99精| 一级午夜影院| 久久综合久久自在自线精品自| 成年人性生活免费看| 人人玩人人添人人澡97| 国精产品一二四区在线看| 久久夜色精品国产噜噜麻豆| 国产一区欧美一区| 午夜激情在线| 曰韩av在线|