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: 97人人模人人爽人人喊38tv| 97一区二区国产好的精华液| 黄色国产一区二区| 国产1区2| 国产亚洲精品久久19p| 欧美二区在线视频| 黑人巨大精品欧美黑寡妇| 99精品一区| 亚洲精品www久久久| 美女脱免费看直播| 国产乱子伦农村xxxx| 97精品国产97久久久久久免费| 色综合久久网| 久99久精品| 夜夜躁日日躁狠狠久久av| 国产午夜精品一区二区理论影院| 亚洲精品一品区二品区三品区| 亚洲精品一区,精品二区| 欧美一区二区三区久久精品视| 一区二区三区国产欧美| 欧美午夜羞羞羞免费视频app | 亚洲精品老司机| 久久一区二区三区视频| 国产九九九精品视频| 国产精品久久久久99| 精品久久9999| 99精品视频一区二区| 免费精品99久久国产综合精品应用| 欧美日韩一区二区三区在线播放 | 国产区精品区| 少妇厨房与子伦在线观看| 日本一区二区三区免费播放| 国产精品尤物麻豆一区二区三区| 国产黄色一区二区三区 | 国产日韩欧美自拍| 国产精品影音先锋| 中文字幕在线一区二区三区| 日韩精品久久久久久久的张开腿让| 午夜天堂在线| 午夜欧美影院| 午夜av免费看| 亚洲精品91久久久久久| 国产精品久久免费视频| 欧美一区二区三区日本| 色一情一乱一乱一区免费网站 | 欧美日韩一区二区三区四区五区| 午夜爽爽爽男女免费观看| 亚洲区日韩| 亚洲国产美女精品久久久久∴| 久久艹亚洲| 久久99精| 国v精品久久久网| 夜夜精品视频一区二区| 午夜影院毛片| 久久99精| 国产精品视频二区三区| 国产麻豆91视频| 久久伊人色综合| 91丝袜国产在线观看| 日本午夜精品一区二区三区| 欧美精品九九| 国产大片一区二区三区| 中文字幕日韩一区二区| 综合国产一区| 国产精品国产三级国产专区52 | 911久久香蕉国产线看观看| 激情久久综合| 中文字幕一二三四五区| 中文在线一区二区三区| 久久精品亚洲精品国产欧美| 欧美日韩卡一卡二| 欧美午夜理伦三级在线观看偷窥 | 久久99中文字幕| 亚洲欧美制服丝腿| 日韩av一二三四区| 国产一区日韩精品| 精品国产免费久久| 91av一区二区三区| 一级午夜电影| 国产在线不卡一区| 国产精品高潮呻吟三区四区| 日本高清二区|