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: 中文字幕日本一区二区| 精品国产一区二区三区四区四| 国产v亚洲v日韩v欧美v片| 午夜理伦影院| 狠狠躁狠狠躁视频专区| 亚洲自偷精品视频自拍| 久久九九亚洲| 色一情一乱一乱一区99av白浆| 午夜精品一二三区| 91久久免费| 少妇av一区二区三区| 日韩欧美高清一区二区| 国产女人好紧好爽| 欧美精品国产一区二区| 中出乱码av亚洲精品久久天堂| 中文字幕一区二区三区又粗| 国产精品视频二区不卡| 精品无人国产偷自产在线| 欧美乱妇高清无乱码一级特黄| 色噜噜日韩精品欧美一区二区 | 日本免费电影一区二区| 九色国产精品入口| 狠狠躁狠狠躁视频专区| av午夜在线| 国产乱码一区二区三区| 国产精品综合一区二区三区| 欧美在线一区二区视频| 人人要人人澡人人爽人人dvd| 麻豆精品国产入口| 在线国产91| 欧美日韩激情一区二区| 狠狠色狠狠色合久久伊人| 夜夜嗨av色一区二区不卡| www.日本一区| 久久国产这里只有精品| 欧美黄色一二三区| 久久不卡一区| 国产伦精品一区二区三区免| 性old老妇做受| 国产精品一区二区在线看| 欧美日韩亚洲三区| 99国产伦精品一区二区三区| 日韩亚洲精品视频| 天摸夜夜添久久精品亚洲人成 | 97人人澡人人添人人爽超碰| 国产在线卡一卡二| 在线国产91| 国产中文字幕91| 亚洲少妇中文字幕| 中文文精品字幕一区二区| 国产女人好紧好爽| 国产区二区| 日韩一区二区三区福利视频| 大bbw大bbw巨大bbw看看| 国产v亚洲v日韩v欧美v片| 国产免费一区二区三区网站免费| 国产一区精品在线观看| 亚洲精品suv精品一区二区| 国产伦精品一区二区三区免费观看| 亚洲精品人| 欧美777精品久久久久网| 色综合久久久久久久粉嫩| 国产精品美女久久久另类人妖| 亚洲欧美日韩精品在线观看| 国产一区在线免费| 国产一区二区黄| 91久久国产视频| 国产乱人乱精一区二视频国产精品| 日韩精品1区2区3区| 亚洲欧美一区二区三区1000| 久久99精品国产麻豆宅宅| 狠狠躁夜夜躁xxxxaaaa| 国产亚洲精品久久午夜玫瑰园| 456亚洲精品| 国产精品久久久不卡| 精品在线观看一区二区| 久久精品国产99| 国产一区二区三区午夜| 久久人人精品| 日本精品99| 国产一区二| 一级午夜电影|