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: 国产的欧美一区二区三区| 国产男女乱淫视频高清免费| 日本三级韩国三级国产三级| 久久精品国产一区二区三区| aaaaa国产欧美一区二区| 亚洲自拍偷拍一区二区三区| 国产专区一区二区| 日韩偷拍精品| 亚洲欧美一卡| 97精品国产97久久久久久粉红| 久久夜色精品国产噜噜麻豆| 久久99精品久久久野外直播内容| 国产在线精品二区| 91视频一区二区三区| 国产午夜精品av一区二区麻豆| 国产乱码精品一区二区三区介绍| 午夜伦全在线观看| 国产理论片午午午伦夜理片2021 | 亚洲精品人| 欧美精品一区二区久久久| 精品一区中文字幕| 免费精品99久久国产综合精品应用| 狠狠色丁香久久综合频道| 国产午夜一区二区三区| 热久久国产| 国产伦精品一区二| 国产91丝袜在线播放动漫| 国产一级片子| 99久久精品一区| 国产品久精国精产拍| 九九精品久久| 91久久精品国产91久久性色tv| 偷拍久久精品视频| 日韩欧美高清一区二区| 久久精品手机视频| 激情久久一区二区三区| 999偷拍精品视频| 亚洲福利视频二区| 狠狠色噜噜狠狠狠狠88| 国产区精品| 91精品视频一区二区| 在线国产一区二区| 91精品一区在线观看| 精品中文久久| 亚洲国产日韩综合久久精品| 92久久精品| 亚洲国产精品97久久无色| 99久久精品免费视频| 国产精品亚州| 97人人模人人爽视频一区二区 | 亚洲少妇一区二区三区| 欧美一区二区三区在线免费观看 | 99精品黄色| 理论片午午伦夜理片在线播放| 狠狠色丁香久久婷婷综合丁香| 911久久香蕉国产线看观看| 久99久视频| 国产经典一区二区| 国产精品18久久久久久白浆动漫| 91秒拍国产福利一区| 午夜伦理片在线观看| 挺进警察美妇后菊| 91久久免费| 娇妻被又大又粗又长又硬好爽| 国产一二区精品| 国产女人与拘做受免费视频| 亚洲自拍偷拍一区二区三区| 中文字幕理伦片免费看| 国产在线一二区| 国产精品一区亚洲二区日本三区 | 国产91热爆ts人妖在线| 色婷婷精品久久二区二区我来| 99国产精品永久免费视频 | 国产日韩欧美综合在线| 国产精品视频一区二区在线观看| 男女视频一区二区三区| 午夜av影视| 精品国产九九九| 国产视频1区2区| 国产午夜精品理论片| 91午夜在线观看| 国产精品久久99|