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: 久久国产精彩视频| 久久一区二区三区视频| 性视频一区二区三区| 欧美日韩国产一二| 91av一区二区三区| 97久久精品人人澡人人爽| 亚洲精品国产一区| 国产亚洲精品精品国产亚洲综合| 91国产一区二区| 午夜影院激情| 一区二区中文字幕在线观看| 91久久久久久亚洲精品禁果| 狠狠色成色综合网| 一区二区久久精品| 中文字幕日韩精品在线| 国产乱对白刺激在线视频| 久久99精品国产99久久6男男 | 亚洲国产精品肉丝袜久久| 国产不卡一二三区| 国产精品乱综合在线| 右手影院av| 精品国产乱码久久久久久免费| 国产欧美一区二区三区在线看| 91在线一区二区| 亚洲精品乱码久久久久久蜜糖图片| 国产大片一区二区三区| 国内精品久久久久久久星辰影视| 久99久精品| 狠狠干一区| 久久96国产精品久久99软件| 国产欧美日韩中文字幕| 精品久久小视频| 国产欧美亚洲一区二区| 亚洲国产精品一区在线| 亚洲国产精品女主播| 欧美二区在线视频| 国产精品视频免费一区二区| 午夜毛片在线| 国产91热爆ts人妖系列| 国产精品偷伦一区二区| 亚洲欧美日韩一级| 中文字幕欧美一区二区三区 | 亚洲伊人久久影院| 欧美69精品久久久久久不卡| 91精品www| 精品在线观看一区二区| 国产一区日韩欧美| 国产91白嫩清纯初高中在线| 91高清一区| 国产69精品久久99的直播节目| 久久国产精品广西柳州门| 欧美乱码精品一区二区| 欧美日韩一区二区三区精品| 一区二区三区四区视频在线| 99久久免费精品视频| 99久久精品国产系列| 精品久久香蕉国产线看观看gif | 一区二区在线国产| 国产一区二区在| 91avpro| 国产一区在线免费| 日本一二区视频| 国产麻豆一区二区| 93精品国产乱码久久久| 综合在线一区| 黄色91在线观看| 国产69精品久久777的优势| 亚洲精品国产精品国自| 精品videossexfreeohdbbw| 午夜看片网| 亚洲欧洲精品一区二区三区不卡| 一区二区三区国产精华| 午夜少妇性影院免费观看| 日本二区在线播放| 夜夜爽av福利精品导航| 色婷婷精品久久二区二区6| 国产精品视频免费一区二区| 久久国产欧美一区二区免费| freexxxx性| 午夜亚洲影院| 国产69精品久久久久777糖心| 三上悠亚亚洲精品一区二区|