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: 狠狠躁夜夜av| 日韩欧美中文字幕精品| 国产亚洲综合一区二区| 亚洲精品www久久久| 色婷婷噜噜久久国产精品12p| 亚洲精品一区在线| 国产毛片精品一区二区| 欧美日韩国产精品一区二区亚洲| 国产精品自拍在线观看| 91福利视频导航| 亚洲欧洲日韩在线| 久久国产欧美视频| 欧美日韩一区二区三区免费| 伊人av中文av狼人av| 亚洲欧美国产日韩综合| 日本丰满岳妇伦3在线观看| 欧美3级在线| 国产三级国产精品国产专区50| 国产日韩欧美网站| 亚洲欧美日韩在线| 国产精品白浆视频| 欧美精品一卡二卡| 91一区二区在线观看| 色综合久久精品| 国产日韩欧美一区二区在线观看| 国产白丝一区二区三区| 狠狠色狠狠色综合久久一| 精品久久久影院| 久久一区二| 免费看农村bbwbbw高潮| 国产另类一区| 精品国产鲁一鲁一区二区三区| 国产理论一区二区三区| 欧美黄色一二三区| 欧洲精品一区二区三区久久| 久久一区二区三区欧美| 午夜毛片在线看| 99久久国产综合| 国产91精品高清一区二区三区| 久久精品国语| 国产欧美三区| 国产69精品99久久久久久宅男| 97人人模人人爽人人喊38tv| 中文天堂在线一区| 精品国产伦一区二区三区免费| 欧美久久一区二区三区| 国产91电影在线观看| 国产午夜伦理片| 国产乱淫精品一区二区三区毛片| 日韩精品一二区| 精品中文久久| 久久福利免费视频| 免费欧美一级视频| 91看片片| 国产丝袜在线精品丝袜91| 麻豆国产一区二区| 欧美激情视频一区二区三区| 国产精品高潮在线| 亚洲精品人| 欧美国产一区二区在线| 国产91免费观看| 狠狠色依依成人婷婷九月| 日韩精品一区二区三区中文字幕| 一区二区三区欧美日韩| 午夜无人区免费网站| 国产一区网址| 精品少妇一区二区三区免费观看焕| 久久免费福利视频| 国产精品不卡一区二区三区 | 国产午夜精品一区二区三区欧美 | 国产一区二区精品免费| 久久国产精品-国产精品| 狠狠色丁香久久婷婷综| 国产不卡三区| 国内精品国产三级国产99| 午夜特级片| 99色精品视频| 一区二区三区欧美在线| 亚洲精品丝袜| 狠狠色噜噜狠狠狠合久| 国产日韩精品久久| 国产高清精品一区二区|