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: 99精品小视频| 国产乱人伦精品一区二区三区| 欧美乱码精品一区二区三| free性欧美hd另类丰满| 国产亚洲综合一区二区| 狠狠插影院| 日韩一区高清| 欧美国产一区二区在线| 狠狠色狠狠色综合日日五| 国产欧美亚洲精品| 国内精品在线免费| 7777久久久国产精品| 国产日产精品一区二区三区| 久久福利视频网| 美国一级片免费观看| 真实的国产乱xxxx在线91| 亚洲精品中文字幕乱码三区91| 一本一道久久a久久精品综合蜜臀| 午夜欧美a级理论片915影院| 精品99在线视频| 久久精品国产精品亚洲红杏| 国产97在线播放| 日韩美一区二区三区| 国产女人和拘做受在线视频| 91精彩刺激对白露脸偷拍 | 欧美一区二区三区久久精品视| 亚洲国产欧美一区| 狠狠色综合久久丁香婷婷| 国产精品视频久久久久久| 欧美一区二区三区四区夜夜大片 | 日韩久久电影| 99国产精品一区| 国产精品久久久麻豆| ass美女的沟沟pics| 亚洲国产精品麻豆| 国产精品九九九九九九九| 福利片91| 中文字幕一区二区三区日韩精品| 激情久久一区| 超碰97国产精品人人cao| 久久精品国产亚| 色综合久久网| 少妇久久精品一区二区夜夜嗨| 国产日韩欧美网站| av中文字幕一区二区| 日韩欧美视频一区二区| 91片在线观看| 欧美亚洲精品一区二区三区| 国产色午夜婷婷一区二区三区| 日韩欧美精品一区二区三区经典| 69xx国产| 香蕉免费一区二区三区在线观看| 538国产精品一区二区免费视频| 国产欧美性| 韩国女主播一区二区| 91日韩一区二区三区| 免费精品99久久国产综合精品应用| 久久精品99国产精品亚洲最刺激| 久热精品视频在线| 久久精品手机视频| 国产精品电影一区二区三区| 夜夜嗨av禁果av粉嫩av懂色av| 国产精品国产三级国产播12软件 | 日韩av一区不卡| 视频一区二区中文字幕| 日韩一区二区精品| 日韩欧美多p乱免费视频| 欧美日韩国产区| 三级视频一区| 国产精品一区二| 一区二区三区国产精品视频| 999久久久国产| 久久91精品国产91久久久| 99久久精品一区字幕狠狠婷婷| 日本一区二区免费电影| 亚洲欧美日本一区二区三区 | 粉嫩久久久久久久极品| 国产91视频一区| 91精品国产91久久久| 日本一区中文字幕| 亚洲精品国产一区二| 福利片一区二区三区|