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: 亚洲少妇中文字幕| 少妇av一区二区三区| 天堂av色婷婷一区二区三区| 国产精品久久久久久久久久不蜜臀| 6080日韩午夜伦伦午夜伦| 999久久久国产精品| 国产精品久久久久久久新郎| 欧美一区二区三区久久综合| 四虎国产精品久久| 免费久久一级欧美特大黄| 91精彩刺激对白露脸偷拍 | 女女百合互慰av| 国产精品免费一视频区二区三区| 国产精品对白刺激久久久| 国产在线干| 一区二区在线精品| 一区二区三区四区视频在线| 毛片大全免费观看| 麻豆精品国产入口| 91久久久爱一区二区三区| 日韩不卡毛片| 国产精品日韩一区二区三区| 91精品一区| 中文字幕国内精品| 久久综合伊人77777麻豆| 亚洲五码在线| 亚洲精华国产欧美| 国产极品美女高潮无套久久久| 国产精品国产三级国产aⅴ下载| 国产精品视频一区二区三| 国产一卡二卡在线播放| 久久aⅴ国产欧美74aaa| 欧美一区二区三区久久综合| 亚洲精品国产精品国自| 91国偷自产一区二区介绍| 日本午夜无人区毛片私人影院 | 岛国精品一区二区| 一区精品二区国产| 国产精品无码专区在线观看| 91精品色| 精品国产一区在线| 欧美精品中文字幕亚洲专区| 夜夜爽av福利精品导航| 亚洲精品国产精品国自| 久久er精品视频| 国产精品99一区二区三区| 丰满岳乱妇在线观看中字| 国产二区精品视频| 中文字幕一二三四五区| 午夜影院一区| 中出乱码av亚洲精品久久天堂| 欧美亚洲视频二区| 亚洲国产精品一区在线观看| 亚洲国产精品一区在线| 国产伦理精品一区二区三区观看体验 | 日韩av在线影视| 欧美黄色一二三区| 亚洲综合日韩精品欧美综合区| 久久国产精品久久| 精品99免费视频| 国产精品久久91| 欧美精品国产精品| 激情久久综合| 久久久中精品2020中文| 亚欧精品在线观看| 偷拍区另类欧美激情日韩91| 欧美激情精品一区| 国产一级在线免费观看| av午夜剧场| 欧美一区二区三区高清视频| 精品久久综合1区2区3区激情 | 欧美黑人巨大久久久精品一区| 99精品欧美一区二区三区美图| 狠狠色成色综合网| 欧美精品乱码视频一二专区 | 亚洲日本国产精品| 精品91av| 国产精一区二区三区| 日韩精品免费一区二区夜夜嗨| 精品国产乱码久久久久久免费| 欧美在线视频一区二区三区| 久久一级精品|