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: 欧美色综合天天久久| 国产九九九精品视频| 人人澡超碰碰97碰碰碰| 99久久夜色精品| 一区二区三区日韩精品| 日本一区二区免费电影| 精品无人国产偷自产在线| 中文字幕一区二区三区不卡| 亚洲欧美日韩一级| 久99久视频| 国产精品久久国产精品99| 狠狠色噜噜狠狠狠狠88| 三级视频一区| 欧美hdxxxx| 国产日韩欧美一区二区在线观看| 狠狠色噜噜狠狠狠狠黑人| 精品国产91久久久| 日本一区二区在线电影| 国产午夜亚洲精品羞羞网站| 少妇久久免费视频| 中日韩欧美一级毛片| 日本一码二码三码视频| 欧美一区二区性放荡片| 亚日韩精品| 中文字幕在线乱码不卡二区区| 高清人人天天夜夜曰狠狠狠狠| 夜夜夜夜夜猛噜噜噜噜噜gg| 91热精品| 黄色av中文字幕| 中文无码热在线视频| 国产一区二区视频免费在线观看 | 毛片大全免费观看| 国产精品一区二区日韩新区| 国产一级大片| 国产一区二区三区四区五区七 | 亚洲国产欧美一区二区三区丁香婷| 午夜影院色| 国产91热爆ts人妖系列| 久久精品国产亚| 国产日韩欧美精品一区| 欧美精品二区三区| 久久国产激情视频| 性刺激久久久久久久久九色| 亚洲精品456在线播放| 国产一区二区伦理| 国产一区欧美一区| 7777久久久国产精品| 思思久久96热在精品国产| 国产欧美一区二区三区不卡高清 | 国产精品久久久久久久久久久久久久不卡| 欧美日韩久久一区| 日韩一区免费| 国产精品无码永久免费888| 国产高清精品一区二区| 91一区二区三区视频| 亚洲国产精品精品| 国产91一区| 68精品国产免费久久久久久婷婷| 久久亚洲精品国产一区最新章节| 日本一区二区电影在线观看| 国产精品一区二区日韩新区| 国产麻豆精品久久| 欧美在线免费观看一区| 自偷自拍亚洲| 亚洲国产99| 综合色婷婷一区二区亚洲欧美国产| 激情久久久久久| 在线观看v国产乱人精品一区二区| 波多野结衣女教师电影| 国产一区二区视频免费在线观看| 国产人澡人澡澡澡人碰视| 国产精品午夜一区二区三区视频| 日韩一区高清| 国产免费区| 久草精品一区| 亚洲v欧美v另类v综合v日韩v| 国产精品久久久久99| 欧美日韩一区视频| 亚洲欧美一卡| 日韩精品一二区| 中文字幕一区二区三区日韩精品| 狠狠插影院|