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: 999久久国精品免费观看网站| 激情久久精品| 夜夜躁人人爽天天天天大学生| 夜夜夜夜曰天天天天拍国产| 亚洲国产一区二区久久久777| 日韩午夜电影在线| 欧美一区二区三区白人| 日韩中文字幕一区二区在线视频 | 日本五十熟hd丰满| 三上悠亚亚洲精品一区二区| 鲁丝一区二区三区免费| 欧美日韩国产精品一区二区| 中文字幕一区三区| 国产第一区二区三区| 91嫩草入口| 欧美一区久久| 国产麻豆一区二区| 久久艹亚洲| 久久国产欧美日韩精品| 亚洲伊人久久影院| 午夜性电影| 国产精品日韩三级| 国产一区二区三区四| 亚洲精品乱码久久久久久国产主播| 欧美日韩国产三区| 国产精品综合在线观看| 久久伊人色综合| 亚洲国产精品国自产拍av| 91一区在线| 国产91视频一区| 日本白嫩的18sex少妇hd| 亚洲国产欧美一区二区丝袜黑人| 久久精品国产亚| 国产视频精品久久| 国产免费区| 一区二区91| 欧美日韩一区二区三区四区五区六区| 日本少妇一区二区三区| 国产vsv精品一区二区62| 日韩精品一区在线观看| 精品国产一区二区三区麻豆免费观看完整版| 久草精品一区| 一区不卡av| 一区二区三区国产精品| 午夜av男人的天堂| 色婷婷综合久久久中文一区二区| 特级免费黄色片| 国产91综合一区在线观看| 国产一二三区免费| 国产精品久久久久四虎| 国产精品亚州| 日日夜夜亚洲精品| 欧美亚洲视频二区| 国产精品一二三在线观看| 99久久婷婷国产精品综合| 欧美日本91精品久久久久| 91av中文字幕| 久久国产精品免费视频| 99riav3国产精品视频| 国产精品视频久久久久久久| 亚洲精品suv精品一区二区| 国产白丝一区二区三区| 欧美高清一二三区| 一色桃子av大全在线播放| 中文字幕日本精品一区二区三区| 四虎国产精品永久在线| 国产一区二区在| 国产精品一二三四五区| 91看黄网站| 91麻豆精品国产91久久| 88国产精品视频一区二区三区| 99热一区二区| 国产在线不卡一区| 精品91av| 国产精品日本一区二区不卡视频| 国产视频在线一区二区| 国产精品影音先锋| 91丝袜国产在线观看| 国产一区二区电影| 国产精品美女久久久免费| 亚洲w码欧洲s码免费| 国产白丝一区二区三区|