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: 一二三区欧美| 亚洲午夜国产一区99re久久| 国产一二三区免费| 日韩精品一二区| 日韩欧美一区二区在线视频| 国产精品久久久久久久久久久新郎| 午夜影院啪啪| 欧美大成色www永久网站婷| 狠狠色丁香久久综合频道| 97人人模人人爽人人喊38tv| av午夜影院| 久久免费视频一区二区| 国产麻豆一区二区| 欧美二区在线视频| 国产suv精品一区二区4| 亚洲四区在线| 狠狠综合久久av一区二区老牛| 欧美一区二区伦理片| 国产区一区| 国产的欧美一区二区三区| 国产午夜精品免费一区二区三区视频| 福利视频亚洲一区| 99精品一区二区| 国产一区二区麻豆| 日本亚洲国产精品| 欧美日韩中文不卡| 少妇自拍一区| 精品国产一二三四区| 精品久久9999| 久久久久久国产精品免费| 国产全肉乱妇杂乱视频在线观看| 日韩av电影手机在线观看| 精品综合久久久久| 日本午夜一区二区| 狠狠色狠狠色88综合日日91| 亚洲精品久久久久一区二区| 日韩精品一区三区| 中文字幕1区2区3区| 国产日韩一区二区在线| 国产资源一区二区三区| 日韩精品一区中文字幕| 国产视频一区二区不卡 | 最新国产一区二区| 国产精品1区2区| 日韩免费一级视频| 亚洲欧美日韩国产综合精品二区 | 99久热精品| 手机看片国产一区| 91亚洲欧美强伦三区麻豆| 国产一区二区三区色噜噜小说| 99久久国产免费,99久久国产免费大片| 精品国产九九九| 亚洲欧美一区二区三区1000| 国产精品视频久久久久久| 国产中文字幕一区二区三区 | 狠狠色综合久久丁香婷婷| 日韩国产欧美中文字幕| 免费看欧美中韩毛片影院| 又黄又爽又刺激久久久久亚洲精品 | 欧美黄色一二三区| 欧美资源一区| 久久国产欧美日韩精品| 国产女人好紧好爽| 国产一区欧美一区| 欧美精品国产一区二区| 久久久久久久亚洲国产精品87| 国产午夜亚洲精品| 国产精品亚洲欧美日韩一区在线| 亚洲精品国产主播一区| 国产99网站| 精品国产一区二区三| 国产乱对白刺激在线视频| 国产一区二区在线免费| 综合久久一区| 久久午夜鲁丝片| 午夜影院色| 免费欧美一级视频| 午夜电影院理论片做爰| 国产精品一区在线观看你懂的| 亚洲欧美日韩综合在线| 国产精品96久久久久久又黄又硬| 91久久一区二区|