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99久久99精品蜜柚传媒| 久久一级精品| 狠狠色噜噜狠狠狠狠777| 国产一级大片| 国产乱人伦精品一区二区| 国产一级片大全| 国产99久久久久久免费看| 丰满岳乱妇bd在线观看k8| 国产特级淫片免费看| 久久久久国产精品www| av午夜在线| 国产日韩欧美自拍| 国产精品自拍不卡| 精品999久久久| 国产精品18久久久久白浆| 91视频国产九色| 性国产日韩欧美一区二区在线| 韩国视频一区二区| 欧美极品少妇xxxxⅹ| 91免费国产视频| 国产精品1区2区| 午夜一级免费电影| 国产真实一区二区三区| 国产精品v一区二区三区| 国产一a在一片一级在一片| 中文字幕一区二区三区不卡| 欧美一区二区三区片| 国产一区二区在| av国产精品毛片一区二区小说| 欧美精品在线不卡| 国产精品96久久久久久久| 中文字幕国内精品| xxxx18日本护士高清hd| 日韩午夜一区| 夜夜爽av福利精品导航| 91精品国产91热久久久做人人| 欧美日韩国产在线一区二区三区 | 日韩精品久久久久久久的张开腿让 | 91理论片午午伦夜理片久久| 亚洲精品国产一区二区三区| 精品国产一区二区三| 精品久久久久一区二区| 在线视频不卡一区| 91国偷自产中文字幕婷婷| 欧美精品日韩精品| 色天天综合久久久久综合片| 456亚洲精品| 久久99精品国产麻豆宅宅| 国产一级片子| 国产伦精品一区二区三区免费迷| 国产婷婷一区二区三区久久| 97久久精品人人做人人爽| 国产精品理人伦一区二区三区| 国产男女乱淫视频高清免费| 国产精品日韩三级| 中文字幕欧美久久日高清| 国产一区第一页| 国产欧美一区二区精品性色超碰| 色婷婷久久一区二区三区麻豆| 国产视频一区二区三区四区| 狠狠色狠狠色综合日日五| 中文字幕一区二区三区又粗| 国产精品综合久久| 国产精品18久久久久久白浆动漫| 日韩国产欧美中文字幕| 久久精品视频3| 狠狠综合久久av一区二区老牛| 91精品国产91热久久久做人人 | 欧美一区二区三区免费视频| 中文字幕制服狠久久日韩二区| 国产日韩欧美网站| 国产一区精品在线观看| 午夜叫声理论片人人影院| 国产精品国产三级国产专区51区 | 久久两性视频| 99国产精品永久免费视频| 久久免费视频一区| 欧美一区二区三区在线免费观看| 欧美乱妇在线视频播放| 最新国产精品久久精品| 精品一区二区三区中文字幕| 国产福利一区在线观看|