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: 蜜臀久久99静品久久久久久| 欧美日韩一区电影| 九九精品久久| 夜夜精品视频一区二区| 鲁一鲁一鲁一鲁一鲁一av| 中文在线一区二区三区| 国产亚洲精品综合一区| 免费看农村bbwbbw高潮| 午夜av影视| 国产1区2| 羞羞免费视频网站| 久草精品一区| 午夜av网址| 伊人av中文av狼人av| 国产精品久久国产三级国电话系列 | 日本一区二区三区中文字幕| 狠狠色狠狠色综合日日五| 四虎久久精品国产亚洲av| 久久国产欧美视频| 99欧美精品| av毛片精品| 一区二区三区欧美精品| 久久青草欧美一区二区三区| 久久99久久99精品免观看软件| 色吊丝av中文字幕| 国产精品第157页| 国产精品久久久久久久久久久久久久不卡 | 国产精品无码专区在线观看| 性欧美激情日韩精品七区| 91久久国产露脸精品国产 | 欧美精品日韩精品| 欧美乱妇高清无乱码免费| 午夜一二区| 日韩精品免费一区二区中文字幕 | 99精品欧美一区二区三区美图| 中文字幕一区2区3区| 日本三级不卡视频| 欧美一区二区三区在线视频播放| 日本一二三区视频在线| 久久99国产综合精品| 国产精品无码专区在线观看| 欧美一区久久| **毛片在线| 韩国女主播一区二区| 四虎国产精品永久在线国在线| 国产精品一区二区在线观看免费| 欧美午夜一区二区三区精美视频| 国产精一区二区三区| 欧美在线视频二区| 视频二区狠狠色视频| 91超薄丝袜肉丝一区二区| 日本一码二码三码视频| 午夜看片在线| 日本精品一二三区| 欧美一区二区三区免费电影| 国产91九色视频| 国产精品丝袜综合区另类| 99国产精品一区| 国产精品日韩视频| 日韩欧美一区精品| 中出乱码av亚洲精品久久天堂| 久久精品综合| 狠狠色依依成人婷婷九月| 亚洲精品色婷婷| 国产精品69久久久| 国产欧美精品一区二区三区小说| 久久精品中文字幕一区| 国产人澡人澡澡澡人碰视| 久久久久久久亚洲国产精品87| 海量av在线| 欧美日韩偷拍一区| 亚洲精品中文字幕乱码三区91| 十八无遮挡| 国产一区在线视频播放| 精品国产1区2区3区| 欧美福利三区| 午夜影院毛片| 国产一级片网站| 久久99精| 日韩欧美国产另类| 国产一区网址| 国产精品久久久久久久久久不蜜月 |