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: 久久一区二区精品视频| 午夜av资源| 91午夜精品一区二区三区| 日本精品99| 国产精品视频一区二区二| 香蕉久久国产| 免费久久99精品国产婷婷六月| 精品美女一区二区三区| 久久久久国产精品嫩草影院| 91精品国产综合久久国产大片| 久久国产精品久久久久久电车| 99久久婷婷国产精品综合| 午夜影院一区二区| 国产91久| 免费看农村bbwbbw高潮| 欧美777精品久久久久网| 欧美精品乱码视频一二专区 | 中文字幕欧美久久日高清| 久久精品手机视频| 精品国产九九九| 国产伦精品一区二区三区照片91 | 午夜影院5分钟| 91精品视频在线免费观看| 国内精品99| 一区二区欧美精品| 欧美一区二区三区日本| 欧美一区二区精品久久911| 亚洲精品国产综合| 国产日韩一二三区| 久久99精品国产麻豆宅宅| 日韩三区三区一区区欧69国产| 激情久久一区二区三区| 性精品18videosex欧美| 国产一区二区91| 午夜av在线电影| 欧美日韩一卡二卡| freexxxxxxx| 午夜毛片影院| 午夜av免费观看| 国产91清纯白嫩初高中在线观看| 97欧美精品| 国产一区二区中文字幕| 亚洲精品www久久久久久广东| 免费精品一区二区三区第35| 国产日韩欧美精品一区| 欧美一级久久久| 久久久国产精品一区| 欧美日韩一区免费| 国产视频一区二区视频| 欧美午夜看片在线观看字幕| 少妇高清精品毛片在线视频| 亚洲精品国产一区二| 国产经典一区二区三区| 综合久久一区二区三区| 日韩精品1区2区3区| 中文乱幕日产无线码1区| 日本道欧美一区二区aaaa| 91免费视频国产| **毛片在线| 国产国产精品久久久久| 欧美日韩一二三四区| 妖精视频一区二区三区| 国产精品一区二区免费视频| 欧美亚洲国产日韩| 色一情一乱一乱一区免费网站 | 久久久久久国产一区二区三区| 国产在线拍揄自揄拍| 激情久久精品| 欧美在线视频一区二区三区| 国产精品亚洲一区| 免费看欧美中韩毛片影院| 欧美精品在线观看一区二区| 欧美三区二区一区| 午夜影院激情| 亚洲精品乱码久久久久久写真| 狠狠躁日日躁狂躁夜夜躁| 久久夜色精品久久噜噜亚| 欧美国产三区| 国产91清纯白嫩初高中在线观看 | 国产一区二区伦理| 国产乱子一区二区| 久久一二区|