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: 国产第一区在线观看| 亚洲欧美色一区二区三区| 91精品色| 亚洲精品www久久久| 国产精品videossex国产高清| 国产三级在线视频一区二区三区| 91在线一区二区| 国产日韩精品一区二区| 精品美女一区二区三区| 亚洲精品主播| 国产国产精品久久久久| 岛国精品一区二区| 亚洲欧美一二三| 日韩av在线一区| 日本一区二区三区免费在线| 国产精品无码永久免费888 | 片毛片免费看| 韩日av一区二区| 国产区图片区一区二区三区| 国产99久久九九精品| 国产精华一区二区精华| 久久中文一区二区| 国产一区观看| 91精品国产综合久久国产大片| 欧美片一区二区| 国产精品一区二区不卡| av中文字幕一区二区| 综合色婷婷一区二区亚洲欧美国产| 国产精品久久久久久久久久久新郎 | 久久精品国产亚洲一区二区| 欧美网站一区二区三区| 日韩夜精品精品免费观看| 99精品小视频| 国产区91| 欧美日韩精品在线一区二区| 日本一区二区电影在线观看| 欧美日韩中文字幕三区| 91久久国产视频| 91久久国产露脸精品国产护士| 日本精品一区视频| 欧美日韩国产区| 国产免费第一区| 国产.高清,露脸,对白| 国产一级不卡视频| 日韩精品999| 国产91精品高清一区二区三区| 国产精品九九九九九九| 国产精品综合在线| 扒丝袜pisiwa久久久久| 欧美日韩国产精品一区二区| 国产一区二区伦理片| 狠狠插影院| 久久亚洲精品国产一区最新章节| 在线国产精品一区| 亚洲乱小说| 日本精品一二三区| 精品一区二区三区影院| 国产不卡一区在线| 日韩精品免费一区二区三区| 一区二区三区毛片| 欧美67sexhd| 精品国产1区2区3区| 久久九精品| 国产91一区二区在线观看| 欧美777精品久久久久网| 国产91丝袜在线熟| 国产免费一区二区三区四区五区| 日日狠狠久久8888偷色| 一区二区欧美视频| 欧美在线视频一二三区| 中文字幕在线乱码不卡二区区| 亚洲国产午夜片| 久久久久亚洲精品视频| 狠狠色噜噜狠狠狠狠2018| 激情久久一区| 91看片片| 国产91色综合| 精品一区电影国产| 久久九精品| 欧美视屏一区二区| 欧美777精品久久久久网| 午夜精品一区二区三区aa毛片|