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: 亚洲日本国产精品| 午夜电影一区二区| 国产69精品久久777的优势| 国产精品99久久久久久宅男| 国产精品久久久综合久尹人久久9| 蜜臀久久99静品久久久久久 | 亚洲午夜天堂吃瓜在线| 午夜影院啪啪| 日韩精品久久一区二区| 国产理论一区| 日韩av免费电影| 激情久久影院| 国产精品国外精品| 国产一区www| 91精品啪在线观看国产线免费| 国产精品高清一区| 一区二区国产盗摄色噜噜| 欧美乱码精品一区二区三| 国产一区二区视频在线| 国产一区中文字幕在线观看| 午夜生活理论片| 中文字幕亚洲欧美日韩在线不卡| 91麻豆精品国产91久久久更新时间| 午夜情所理论片| 国产v亚洲v日韩v欧美v片| 精品视频在线一区二区三区| 农村妇女精品一二区| 精品亚洲午夜久久久久91| 国产精品刺激对白麻豆99| 欧美freesex极品少妇| 国产91一区| 午夜精品999| 爽妇色啪网| 国产精品无码永久免费888| 夜夜嗨av禁果av粉嫩av懂色av| 亚洲国产精品二区| 91精品久久天干天天天按摩| 日韩一区国产| 午夜看片网| 国产有码aaaae毛片视频| 国产一级自拍片| 91精品视频在线观看免费| 欧美精品日韩精品| 99国产精品久久久久老师| 国产亚洲精品综合一区| 国产白丝一区二区三区| 国产欧美日韩亚洲另类第一第二页| 91精品国模一区二区三区| 香港日本韩国三级少妇在线观看| bbbbb女女女女女bbbbb国产| 国产又黄又硬又湿又黄| 91精品久久天干天天天按摩| 亚洲乱码av一区二区三区中文在线: | 91免费国产| 国语对白老女人一级hd| 一区二区免费在线观看| 国产二区三区视频| 三上悠亚亚洲精品一区二区 | 久久一级精品| 国产无遮挡又黄又爽又色视频| 亚洲福利视频二区| 久久激情综合网| 国产精品久久久久久久新郎| 99精品欧美一区二区三区美图| 老太脱裤子让老头玩xxxxx | 日韩精品一区二区三区四区在线观看| 欧美午夜精品一区二区三区| 国产免费一区二区三区四区| 欧美在线免费观看一区| 国产在线一区观看| 久久国产麻豆| 激情欧美一区二区三区| 国产一级大片| 亚洲精品20p| 欧美精品国产一区二区| 黄毛片免费| 国产欧美一区二区在线观看| 一区二区国产精品| 99国产精品9| 国产亚洲精品久久久456| 99er热精品视频国产| 欧美日韩国产一区二区三区在线观看|