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: 国产精品美女www爽爽爽视频| 久久久国产精品一区| 亚洲高清久久久| 日本精品一二三区| 国产精品第56页| 日韩欧美一区二区在线视频| 亚洲精品日韩色噜噜久久五月| 中文字幕一区二区在线播放| 亚洲国产精品女主播| 国产97久久| 午夜免费一级片| 亚洲国产精品二区| 久久一二区| 久久精品视频偷拍| 国产1区2| 99视频国产精品| 九色国产精品入口| 午夜电影网一区| 97人人澡人人爽人人模亚洲| 亚洲精品国产主播一区| 91精品国产九九九久久久亚洲| 欧美高清性xxxxhd| 小萝莉av| 国产一区二区视频免费在线观看| 欧美午夜一区二区三区精美视频| av中文字幕一区二区| 夜夜夜夜曰天天天天拍国产| 国产一区二区三区在线电影| 少妇性色午夜淫片aaa播放5| 久久精品一二三四| 狠狠色狠狠色合久久伊人| 视频一区欧美| 亚洲精品一区在线| 国产精品尤物麻豆一区二区三区 | 91午夜在线观看| 国内视频一区二区三区| 欧美激情图片一区二区| 91片在线观看| 欧美色综合天天久久| 国产91丝袜在线播放动漫| 国产日韩欧美中文字幕| 日韩av在线播放观看| 日韩精品福利片午夜免费观看| 综合国产一区| 中文字幕在线一二三区| 狠狠插狠狠插| 久久久久亚洲精品| 日韩精品久久久久久中文字幕8| 午夜在线观看av| 93久久精品日日躁夜夜躁欧美| xx性欧美hd| 午夜剧场一区| 国产欧美久久一区二区三区| 欧美乱偷一区二区三区在线| 国产www亚洲а∨天堂| 国产精品高潮呻吟视频| 国产欧美日韩在线观看| 国产一卡二卡在线播放| 国产欧美一二三区| 91精品系列| 97欧美精品| 日韩国产精品一区二区| 欧美乱妇高清无乱码免费 | 久99久视频| 国产一区二区三级| 精品国产仑片一区二区三区| 97香蕉久久国产超碰青草软件| 国产毛片精品一区二区| 狠狠躁日日躁狂躁夜夜躁| 国产精品国产三级国产专播精品人| 午夜看片网站| 国产精品久久久久久久久久久不卡| 欧美乱妇高清无乱码一级特黄| 天干天干天啪啪夜爽爽99| 国产精品九九九九九| 日韩精品一区二区三区不卡| 欧美一区二区免费视频| 国内精品国产三级国产99| ass美女的沟沟pics| 国产亚洲综合一区二区| 国产精品九九九九九九| 国产一区在线免费|