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: 香港三日三级少妇三级99| 国产日韩欧美三级| 色一情一交一乱一区二区三区| 国产女人与拘做受免费视频| 久久国产精品网站| 国产一区在线免费| 久久精品视频偷拍| 国产精品一区二区6| 日本精品一二三区| 99久久婷婷国产亚洲终合精品| 激情久久一区| 欧美一区二三区人人喊爽| 国产日韩欧美精品一区| 国产偷窥片| 亚洲欧美日韩视频一区| 国产91精品一区二区麻豆亚洲| 69xx国产| 亚洲精品日韩在线| 国产理论一区| 久久精品99国产国产| 欧美3级在线| 国产精品区一区二区三| 日韩av在线资源| 99热久久这里只精品国产www | 日韩精品免费一区二区夜夜嗨| 国产一级一区二区| 日韩欧美国产高清91| 狠狠躁天天躁又黄又爽| 在线精品国产一区二区三区| 亚洲视频精品一区| 一区二区精品久久| 亚洲三区在线| 午夜剧场a级免费| 欧美一级不卡| 久久国产这里只有精品| 午夜精品在线观看| 久久精品国语| 久久婷婷国产香蕉| 欧美日韩激情一区| 欧美在线视频三区| 国产一级片自拍| 狠狠色综合久久婷婷色天使| 日韩精品免费看| 91精品中综合久久久婷婷| 日韩国产精品一区二区| av不卡一区二区三区| 欧美一区二三区人人喊爽| 亚洲视频h| 中文字幕欧美久久日高清| 欧美一区二区精品久久| 国产一区不卡视频| 国产精品96久久久久久久| 国产偷窥片| 精品免费久久久久久久苍| 一区二区精品在线| 性视频一区二区三区| 亚洲女人av久久天堂| 日韩av在线影院| 国产视频一区二区三区四区| 国产日韩一二三区| 日日噜噜夜夜狠狠| 狠狠躁夜夜躁2020| 国产精品免费观看国产网曝瓜| 亚洲一区中文字幕| 色偷偷一区二区三区| 亚洲制服丝袜在线| 日韩午夜毛片| www.久久精品视频| 福利视频亚洲一区| 亚洲无人区码一码二码三码| 91人人爽人人爽人人精88v | 欧洲激情一区二区| 91嫩草入口| 香蕉久久国产| 日本福利一区二区| 亚洲日韩欧美综合| 少妇高潮ⅴideosex| 99re热精品视频国产免费| 久久一区二区精品| 亚洲日韩欧美综合| 亚洲区在线| 扒丝袜网www午夜一区二区三区|