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: 亚洲精品欧美精品日韩精品| 丰满岳妇伦4在线观看| 夜夜嗨av色一区二区不卡| 国产精品96久久久| 久久综合国产伦精品免费| 19videosex性欧美69| 国产suv精品一区二区4| 国产在线一区不卡| 国产精品一区一区三区| 销魂美女一区二区| 国产馆一区二区| 国产精品一二二区| 69久久夜色精品国产69–| 国产白嫩美女在线观看| 免费超级乱淫视频播放| 欧美久久精品一级c片| 亚洲一区二区国产精品| 少妇久久免费视频| 一区二区三区欧美在线| 国产欧美视频一区二区| 精品福利一区| 97精品国产aⅴ7777| 日韩精品一区二区亚洲| 久久国产精品99国产精| 亚洲一区二区福利视频| 国产亚洲综合一区二区| 国产精品久久久久久久久久久久久久不卡| 少妇又紧又色又爽又刺激的视频| 久久国产中文字幕| 中文字幕在线播放一区| 狠狠色很很在鲁视频| 99久久久国产精品免费调教网站| 91精品国产九九九久久久亚洲| 国产精品亚洲一区| 夜夜嗨av一区二区三区中文字幕| 91精品视频在线观看免费| 国产一区二区三区久久久| 午夜毛片电影| 91波多野结衣| 国产资源一区二区| 亚洲精品丝袜| 国产在线一二区| 亚洲va国产| 久久久久久综合网| 欧美一区久久久| 欧美日韩一区在线视频| 欧美一区二区三区久久| 国产精品美女www爽爽爽视频| 国产二区免费| 国产综合久久精品| 亚洲精品一区二区三区香蕉| 综合国产一区| 福利片一区二区三区| 中出乱码av亚洲精品久久天堂| 亚洲精品91久久久久久| 欧美日韩综合一区| 国产欧美一区二区精品久久| 国产午夜精品av一区二区麻豆 | 国产精品亚发布| 国产一区不卡视频| 国产精品v欧美精品v日韩精品v| 国产乱了高清露脸对白| 国产精品美女一区二区视频| 肉丝肉足丝袜一区二区三区| 91视频一区二区三区| 特高潮videossexhd| 国产中文字幕一区二区三区| 国产精品日韩电影| 日本免费电影一区二区三区| 精品一区二区三区中文字幕| 91免费视频国产| 亚洲精品日韩激情欧美| 欧美在线视频二区| 午夜片在线| 国产欧美日韩精品一区二区三区| 欧美日韩久久一区二区| 午夜爽爽爽男女免费观看| 久久99精品久久久野外直播内容| 国产午夜精品一区二区三区最新电影| 欧美激情在线免费| 午夜影院一区| 欧美日韩精品中文字幕|