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: 午夜理伦影院| 国内精品99| 亚洲精品国产精品国自产网站按摩| 美女直播一区二区三区| 欧美一区二区三区免费视频| 91久久免费| 亚洲s码欧洲m码在线观看| 免费毛片a| 99爱精品视频| 国产精品久久久久久亚洲调教| 亚洲精品国产91| 国产91丝袜在线播放动漫| 97久久国产精品| 欧美一区二区三区三州| 精品国产一区二区三区高潮视| 久久99久久99精品免观看软件| av不卡一区二区三区| 国产精欧美一区二区三区久久| 99国产精品久久久久| 午夜影皖精品av在线播放| 少妇高潮大叫喷水| 国产精品久久久麻豆| 狠狠色丁香久久综合频道日韩| 国产一区午夜| 狠狠色噜噜狠狠狠狠色吗综合 | 欧美日韩国产精品一区二区三区| 午夜伦情电午夜伦情电影| 国产在线播放一区二区| 国产一区三区四区| 欧美精品一区二区久久| 午夜大片网| 久免费看少妇高潮a级特黄按摩| 538国产精品| 国产精欧美一区二区三区久久| 日韩区欧美久久久无人区| 亚洲**毛茸茸| 精品久久二区| 欧美一区二区三区另类| 国产午夜精品一区| 欧洲另类类一二三四区| 69久久夜色精品国产69乱青草| 精品国产乱码久久久久久久| 欧美在线一级va免费观看| 久久狠狠高潮亚洲精品| 国产超碰人人模人人爽人人添| 日本精品三区| 国产专区一区二区| 欧美精品五区| 欧洲在线一区二区| 国产一区二区三区午夜| 欧美亚洲精品suv一区| 免费超级乱淫视频播放| 欧美日韩一区二区三区不卡视频| 国产欧美精品va在线观看| 国产农村妇女精品一区二区| 精品三级一区二区| 99国产精品一区二区| 日韩av电影手机在线观看| 国产精品国产三级国产专区55| 97人人模人人爽人人喊38tv| 国产乱人伦精品一区二区三区| 久久夜靖品2区| 国产精品乱码一区二区三区四川人| 国产精品久久久久久久妇女| 欧洲激情一区二区| 国产精品久久国产精品99 | 亚洲自拍偷拍一区二区三区| 狠狠躁夜夜躁2020| 欧美xxxxhdvideos| 国产香蕉97碰碰久久人人| 久久99精| 国产激情二区| 国模一区二区三区白浆| 久久99精品久久久野外直播内容| 久久福利视频网| 91国偷自产中文字幕婷婷| 制服丝袜视频一区| 精品综合久久久久| 4399午夜理伦免费播放大全| 国产精品久久免费视频在线| 国产精品v欧美精品v日韩| 欧美日韩一区不卡|