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: 国产精品色婷婷99久久精品| 日韩欧美精品一区二区三区经典| free性欧美hd另类丰满| 国产精品亚洲精品一区二区三区| 久久天天躁狠狠躁亚洲综合公司| 激情欧美一区二区三区| 91人人精品| 亚洲精品乱码久久久久久蜜糖图片| 午夜影院h| 亚洲乱小说| 免费午夜在线视频| 欧美精品八区| 国产精品高潮呻吟久| 国产色婷婷精品综合在线播放| 97人人澡人人爽人人模亚洲| 亚洲欧美日韩国产综合精品二区 | 国产一级一区二区三区| 国产91刺激对白在线播放| 久久噜噜少妇网站| 午夜天堂电影| 国产白嫩美女在线观看| 一区二区久久久久| 日本精品一二三区| 国产精品二区一区| 欧美精品一区久久| 日韩av在线免费电影| 91丝袜诱惑| 91精品第一页| 欧美日韩一区二区在线播放| 亚洲国产欧美一区二区丝袜黑人| 91国产在线看| 亚洲一区2区三区| 国产精品视频一区二区三| 视频一区二区三区欧美| 精品久久一区| 精品一区二区超碰久久久| 大伊人av| 蜜臀久久精品久久久用户群体| 日本一区二区三区四区高清视频| 国产日产欧美一区二区| 国产精品国产三级国产专区52 | 国产一区在线免费观看| 国产偷亚洲偷欧美偷精品| 国产一区日韩精品| 亚洲1区在线观看| 久久九精品| 一区二区国产精品| 99er热精品视频国产| 91超碰caoporm国产香蕉| 亚洲色欲色欲www| 538国产精品一区二区在线| 香港三日三级少妇三级99| 久久天堂国产香蕉三区| 538国产精品一区二区在线| 国产日韩欧美精品一区| 少妇性色午夜淫片aaa播放5| 国产日产高清欧美一区二区三区| 国产精品国产三级国产专区55| 亚洲乱码av一区二区三区中文在线: | 夜夜爱av| 99久热精品| 久久国产精品广西柳州门| 亚洲欧洲精品一区二区三区不卡| 国模精品免费看久久久| 国产999精品视频| 久久国产中文字幕| 国产精品一区二区在线观看免费| 午夜影院黄色片| 91精品综合| 欧美精品在线观看视频| 亚洲国产美女精品久久久久∴| 亚洲欧洲日韩av| 国产三级欧美三级日产三级99| 国产床戏无遮挡免费观看网站| 在线观看v国产乱人精品一区二区 国产日韩欧美精品一区二区 | 午夜国产一区二区三区四区| 91麻豆精品国产综合久久久久久| 日本美女视频一区二区三区| 99视频一区| 91波多野结衣| 国产午夜精品一区二区三区欧美| 亚洲精品少妇一区二区 |