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: 亚洲高清乱码午夜电影网| 欧美一级不卡| 久久国产精彩视频| 国产乱人乱精一区二视频国产精品| 国产精品久久久久久久久久久杏吧| 国产呻吟高潮| 国产特级淫片免费看| 国产精品美女久久久免费| 久久婷婷国产综合一区二区| 欧美老肥婆性猛交视频| 国产精品免费不卡| 91精品免费观看| 少妇久久免费视频| 亚洲乱亚洲乱妇50p| 日韩av在线资源| 久久网站精品| 精品一区中文字幕| 68精品国产免费久久久久久婷婷 | 偷拍久久精品视频| 欧洲在线一区| 国产aⅴ一区二区| 免费视频拗女稀缺一区二区| 午夜叫声理论片人人影院| 国产色午夜婷婷一区二区三区| 国产欧美亚洲精品第一区软件| 国产在线不卡一区| 日韩av在线影视| 亚洲w码欧洲s码免费| 欧美日韩一区免费| 欧美日韩精品影院| 国产一级大片| 国产高清在线一区| 国精产品一二四区在线看| 久久午夜无玛鲁丝片午夜精品| 国产精品丝袜综合区另类| 欧美日韩卡一卡二| 日本一区二区三区电影免费观看| 国产88av| 欧美日韩一区二区三区69堂| 玖玖精品国产| 午夜亚洲国产理论片一二三四| 国产精欧美一区二区三区久久久| 国产视频一区二区视频| 性old老妇做受| 91一区二区三区在线| 国产欧美一区二区精品久久久| 日本黄页在线观看| 中文乱码在线视频| 亚欧精品在线观看| 亚洲四区在线| 午夜精品99| 少妇又紧又色又爽又刺激视频网站| 丰满少妇高潮惨叫久久久一| 亚洲精品日本久久一区二区三区| 一本一道久久a久久精品综合蜜臀 国产三级在线视频一区二区三区 日韩欧美中文字幕一区 | 国产精品乱综合在线| 青苹果av| 国产免费观看一区| 91麻豆精品国产91久久久更新资源速度超快| 亚洲国产精品综合| 在线国产一区二区三区| 日韩精品一区在线视频| 99精品一区二区| 欧美一区二区三区白人| 欧美日韩国产专区| 91精品国产91久久久| 精品一区二区三区自拍图片区| 色噜噜狠狠色综合中文字幕 | 91片在线观看| 黄色av免费| 日本一区午夜艳熟免费| 国产在线拍偷自揄拍视频| 国产日韩欧美精品一区二区| 国产精品麻豆99久久久久久| 午夜国内精品a一区二区桃色| 香蕉av一区二区| 99久久国产免费| 高清国产一区二区三区| 日韩欧美中文字幕精品| 国产91在| 91偷自产一区二区三区精品| 热99re久久免费视精品频软件|