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: 狠狠色噜噜狠狠狠狠69| 国产综合久久精品| 99久热精品| 精品国产仑片一区二区三区| 久久国产精品-国产精品| 性old老妇做受| 色就是色欧美亚洲| 国久久久久久| 97欧美精品| 国产大学生呻吟对白精彩在线| 日本一区午夜艳熟免费| 久久精品麻豆| 99精品欧美一区二区三区美图| 一区二区三区国产精品视频 | 野花社区不卡一卡二| 国产精品乱综合在线| 国产美女三级无套内谢| 欧美在线一级va免费观看| 日本午夜久久| 欧美精品一区二区三区久久久竹菊| 精品一区二区三区中文字幕| 国产精品1区二区| 色综合久久网| 一区二区三区电影在线观看| 欧美激情视频一区二区三区免费| 亚洲伊人久久影院| 国产91丝袜在线| 免费久久一级欧美特大黄| 亚洲欧美日韩综合在线| 四虎国产精品久久| 国产jizz18女人高潮| 亚洲激情中文字幕| 狠狠色狠狠色88综合日日91| 欧美日韩中文字幕一区| 91视频国产九色| 国产激情二区| 91黄色免费看| 国产欧美综合一区| 国产91高清| 亚洲精品久久久久中文第一暮| 91avpro| 久久精品99国产国产| 精品国产一区二区三区高潮视| 亚洲综合日韩精品欧美综合区| 国产精品日本一区二区不卡视频 | 国产免费区| 少妇在线看www| 丝袜诱惑一区二区三区| 国产精品久久久久久久久久不蜜臀| 亚洲伊人久久影院| 国产精品久久久久久久新郎| 97人人模人人爽人人喊0| 香蕉免费一区二区三区在线观看| 正在播放国产一区二区| 一区二区精品久久| 亚洲欧洲另类精品久久综合| 久久夜色精品亚洲噜噜国产mv| 国产又黄又硬又湿又黄| 男人的天堂一区二区| 日韩精品免费播放| 91热精品| 日本一区午夜艳熟免费| 国产69精品久久777的优势| 亚洲精品一区二区三区98年| 欧美日韩久久一区| 欧美日本91精品久久久久| 久久久99精品国产一区二区三区| 国产精品亚洲二区| 国产另类一区| 97久久超碰国产精品| 亚洲乱视频| 91社区国产高清| 国产综合久久精品| 最新日韩一区| 91精品色| 蜜臀久久99静品久久久久久 | 国产一区二区三级| 窝窝午夜精品一区二区| 91精品啪在线观看国产线免费| 久久久久久亚洲精品中文字幕| 一区二区三区国产精品| 在线中文字幕一区|