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: 国产精品天堂| 国产一区二区在| 99精品国产一区二区三区麻豆| 丰满少妇高潮惨叫久久久一| 日韩一区二区福利视频| 少妇太爽了在线观看免费| 精品国产一区二区三区高潮视| 99国产精品99久久久久| 午夜黄色网址| 一区二区中文字幕在线观看| 欧美日韩不卡视频| 免费午夜在线视频| 国产国产精品久久久久| 高清国产一区二区三区| 国产精品久久久久久久妇女| 自拍偷在线精品自拍偷写真图片| 国产一区二区精品在线| 国产日韩欧美另类| 免费看欧美中韩毛片影院| 亚洲一区中文字幕| 欧美一区视频观看| 91秒拍国产福利一区| 香蕉久久国产| 精品国产一区二| 国产99小视频| 精品国产一二三四区| 玖玖国产精品视频| 国产高清无套内谢免费| 狠狠色噜噜狠狠狠狠2021免费| 欧美日韩一级二级三级| 国产精品入口麻豆九色| 久久夜色精品亚洲噜噜国产mv| 国产视频二区在线观看| 国产91丝袜在线| 久久国产中文字幕| 99国精视频一区一区一三| 特级免费黄色片| 欧美高清极品videossex| 久久精品亚洲精品国产欧美| 香蕉视频在线观看一区二区| 猛男大粗猛爽h男人味| 国产精品视频二区三区| 91夜夜夜| 91视频国产一区| 91黄在线看| 欧美日韩国产色综合一二三四| 久久久精品久久日韩一区综合| 91午夜在线| 精品久久综合1区2区3区激情| 国产视频一区二区在线| 亚洲精品性| 国产毛片精品一区二区| 狠狠插狠狠干| 欧美一级不卡| 国模吧一区二区| 国产精品国产三级国产播12软件| а√天堂8资源中文在线| 97久久精品人人澡人人爽| 亚洲免费精品一区二区| 精品视频久| sb少妇高潮二区久久久久| 国产一区二区伦理片| 99爱精品视频| 国产精品高潮呻吟视频| 三级视频一区| 久久综合狠狠狠色97| 丰满岳妇伦4在线观看| 欧美性二区| 精品国产91久久久| 国产69精品久久久久9999不卡免费 | 中文无码热在线视频| 日本少妇高潮xxxxⅹ| 国产九九影院| 国产一区二区伦理| 久久久精品中文| 国产欧美一区二区在线| 国产特级淫片免费看| 日本精品一二区| 国91精品久久久久9999不卡| 麻豆精品久久久| 性old老妇做受| 欧美一区二区三区免费视频|