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: 欧美综合国产精品久久丁香| 久久精视频| 国产黄色一区二区三区| 国产福利一区在线观看| 一区二区三区国产视频| 免费观看xxxx9999片| 国产免费观看一区| 李采潭伦理bd播放| 国产精品一级在线| 真实的国产乱xxxx在线91| 国产精品电影免费观看| 免费超级乱淫视频播放| 狠狠色狠狠色88综合日日91| 国产一区二区精品在线| 欧美在线一区二区视频| 国产欧美www| 丝袜美腿诱惑一区二区| 日韩午夜毛片| 日韩不卡毛片| 国内精品久久久久影院日本| 国产天堂第一区| 国产91清纯白嫩初高中在线观看 | 国产1区2区视频| 日本精品一区视频| 欧美在线观看视频一区二区三区| 午夜wwww| 午夜影院色| 亚洲制服丝袜中文字幕| 中文字幕欧美日韩一区| 国产品久久久久久噜噜噜狼狼 | 欧美黄色片一区二区| 李采潭无删减版大尺度| 99精品小视频| 色乱码一区二区三区网站| 欧美一区二区三区艳史| 国语对白一区二区三区| 强制中出し~大桥未久10在线播放| 麻豆视频免费播放| 久久99精品国产麻豆婷婷洗澡| 国产精品伦一区二区三区视频| 在线国产精品一区| 国产伦精品一区二区三区免费下载| 久久国产精品首页| 日本伦精品一区二区三区免费| 欧美freesex极品少妇| 99久久精品免费看国产免费粉嫩| 少妇高潮大叫喷水| 欧美综合国产精品久久丁香| 乱淫免费视频| 中文字幕二区在线观看| 国产日韩欧美精品一区二区| 国产大学生呻吟对白精彩在线| 午夜老司机电影| 一区二区三区精品国产| 国产亚洲精品久久777777| 99久久婷婷国产精品综合| 午夜一级电影| 免费观看xxxx9999片| 一区二区欧美精品| 国产精品亚洲精品一区二区三区| 国产69精品久久久久孕妇不能看 | 97精品久久久午夜一区二区三区| 欧美精品国产一区| 欧美在线视频三区| 国产91综合一区在线观看| 韩国女主播一区二区| 久久午夜鲁丝片午夜精品| 国产高清不卡一区| 素人av在线| 欧美极品少妇xxxxⅹ| 亚洲精品456在线播放| 欧美一区二区三区久久久精品| 中文字幕久久精品一区| 日韩欧美国产高清91| 欧美一区二区三区视频在线观看| 国内久久久| 欧美日韩一区二区三区在线观看视频| 国产一区影院| 欧美日韩精品在线一区二区| 日韩久久精品一区二区| 国产精自产拍久久久久久蜜 | 午夜裸体性播放免费观看|