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: 91久久精品在线| 色狠狠色狠狠综合| 欧美精选一区二区三区| 国产欧美三区| 国产一区二区三区黄| 欧美一区二区三区爽大粗免费| 中文在线√天堂| 日本丰满岳妇伦3在线观看| 国产91视频一区| 国产精品乱码一区二区三区四川人 | 99久久婷婷国产综合精品电影| 国产在线拍揄自揄拍| 精品一区二区三区中文字幕| 久久久久国产一区二区三区不卡| 国产欧美精品va在线观看| 狠狠色很很在鲁视频| 17c国产精品一区二区| 欧美日韩三区| 九九精品久久| 国产精品一区二区中文字幕| 久久精品国产一区二区三区| 国产精品一区二区免费| 国产视频精品久久| 狠狠色狠狠色综合系列| 91精品高清| 久久国产精品久久久久久电车| 午夜影院激情| 午夜激情电影院| 国内自拍偷拍一区| 午夜wwww| 日韩精品一区二区三区中文字幕| 久久一二区| 国产一级不卡毛片| 国产在线卡一卡二| 精品国产一区二区三区在线| 国产精品九九九九九九九| 高清欧美精品xxxxx| 一区二区久久精品66国产精品| 中文乱码字幕永久永久电影 | 久久久久亚洲国产精品| 国产日韩欧美自拍| 中文字幕一级二级三级| 中文乱码在线视频| 欧美3p激情一区二区三区猛视频 | 国产欧美精品一区二区三区小说 | 99久久婷婷国产精品综合| 国产精品一区二区av日韩在线| 午夜av电影网| 欧美亚洲国产日韩| 99精品视频免费看| 欧美日韩国产免费观看| 四虎国产精品久久| 国产www亚洲а∨天堂| 99国产精品永久免费视频 | 国产欧美视频一区二区| 国产97久久| 久精品国产| 欧美日韩一区二区三区在线播放| 国产视频一区二区视频| 精品日韩久久久| 精品欧美一区二区精品久久小说| 欧美一级片一区| 欧美日韩三区| 狠狠色噜噜狠狠狠狠综合久| 精品美女一区二区三区| 久爱视频精品| 久久国产精品网站| 狠狠色综合欧美激情| 最新国产精品久久精品| 午夜一区二区三区在线观看| 一级午夜影院| 国产一区激情| 视频一区二区三区中文字幕| 精品国产乱码久久久久久图片| 国产韩国精品一区二区三区| 久久国产欧美日韩精品| 国产精品九九九九九九| 国产欧美日韩一区二区三区四区| 国产欧美精品一区二区三区-老狼| 亚日韩精品| 日本午夜久久| 国产精华一区二区精华|