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: 国产精品一区二区免费| 91精品国产91热久久久做人人| 97人人模人人爽视频一区二区| 精品一区电影国产| 岛国黄色网址| 午夜电影一区| 久久99精品国产99久久6男男| 9999国产精品| 欧美一级久久久| 午夜在线看片| 亚洲国产精品精品| 国产在线拍揄自揄拍| 黄毛片在线观看| 精品一区在线观看视频| 欧美一区二区三区另类| 日韩精品免费播放| 国产91免费观看| 亚洲第一天堂无码专区| 91社区国产高清| 亚洲国产精品综合| 欧美午夜理伦三级在线观看偷窥| 午夜影院伦理片| 免费高潮又黄又色又爽视频| 亚洲国产美女精品久久久久∴| 日本一区二区电影在线观看 | 国产日韩欧美在线一区| 午夜理伦影院| 97人人澡人人添人人爽超碰| 国产日韩精品一区二区三区| 精品99在线视频| 国产一区欧美一区| 亚洲国产精品一区二区久久,亚洲午夜| 国产精品刺激对白麻豆99| 欧美日韩中文不卡| 国产在线精品二区| 999久久久国产精品| 欧美67sexhd| 国产精品女人精品久久久天天| 国产91在线播放| 97久久超碰国产精品| 蜜臀久久久久久999| 久久五月精品| 国产欧美一区二区三区在线| 91麻豆国产自产在线观看hd| 国产精品99久久久久久宅男| 久久久久久久亚洲国产精品87| 少妇太爽了在线观看免费| 精品视频久| 一本一道久久a久久精品综合蜜臀| 欧美一区二区三区激情在线视频| 欧美3级在线| 国产一区二区综合| 国产主播啪啪| 亚洲天堂国产精品| 国产亚洲精品精品国产亚洲综合| 亚洲欧美日韩视频一区| 国产在线精品一区二区| 高清欧美xxxx| 久久精品欧美一区二区| 亚洲自拍偷拍中文字幕| 欧美日韩国产一区二区三区在线观看| 四虎国产永久在线精品| 国产精品亚洲一区| 日本aⅴ精品一区二区三区日| 日本不卡精品| 91国偷自产一区二区介绍| 国产亚洲精品精品国产亚洲综合| 国产精品一品二区三区四区五区| 国产黄一区二区毛片免下载| 97涩国一产精品久久久久久久| 中文字幕在线视频一区二区| 狠狠色丁香久久婷婷综合丁香| 欧美精品第1页| 欧美精品久| 国产一区二区精品在线| 欧美高清性xxxxhdvideos| 国产一二区精品| 欧美在线视频二区| 91丝袜诱惑| 欧美一区二区三区四区在线观看| 国产真实一区二区三区| 精品a在线|