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: 国产精品偷拍| 国产在线一区不卡| 国产精品一区一区三区| 国产电影一区二区三区下载| 久久国产精品免费视频| 综合久久一区二区三区| 欧美一区二区激情三区| 视频一区二区国产| 丰满少妇高潮惨叫久久久一| 久久99精品国产麻豆婷婷洗澡 | 久久久精品观看| 国产精品一区二区在线观看 | 国产欧美久久一区二区三区| 91免费国产视频| 91精品资源| 国产麻豆91视频| 亚洲欧洲一二三区| 国产精品日本一区二区不卡视频| 亚洲乱视频| 久久福利视频网| 国产另类一区| 久久久999精品视频| 国产97久久| 国产婷婷色一区二区三区在线| 欧美日韩激情一区二区| 91精品国产综合久久婷婷香| 欧美色图视频一区| 狠狠躁夜夜| 日日狠狠久久8888偷色| 国产欧美日韩精品一区二区图片 | 在线观看v国产乱人精品一区二区| 免费视频拗女稀缺一区二区| 日韩欧美国产中文字幕| 国产精品国产三级国产专区52 | 夜夜躁日日躁狠狠久久av| 国产欧美日韩中文字幕| 一区精品二区国产| 久久久久久久国产| 国产美女三级无套内谢| 精品婷婷伊人一区三区三| 久久国产欧美日韩精品| 99精品区| 亚洲高清国产精品| 欧美一区二区三区三州| 欧美日韩一区二区高清| sb少妇高潮二区久久久久| 亚洲欧美一区二区三区1000| 狠狠色噜噜狠狠狠狠米奇777| 亚洲区日韩| 国产欧美亚洲一区二区| 午夜伦全在线观看| 国产91久| 国产精品日韩在线观看| 免费午夜片| 热久久一区二区| 91婷婷精品国产综合久久| 日韩av在线网址| 亚洲少妇一区二区三区| 日韩精品一区二区久久| 欧美二区在线视频| av中文字幕一区二区| 日韩中文字幕亚洲精品欧美| 偷拍自中文字av在线| 好吊妞国产欧美日韩免费观看网站| 一区二区三区中文字幕| 国产日韩精品久久| 欧美国产一区二区三区激情无套| 亚洲精品一区,精品二区| 欧美激情精品一区| 神马久久av| 免费的午夜毛片| 亚洲精品国产综合| xxxx18日本护士高清hd| 国产麻豆一区二区三区在线观看| 精品国产一区二区三区麻豆免费观看完整版 | 国产69精品久久久久777糖心| 97国产精品久久| 精品久久不卡| 久久久久久久亚洲视频| 日韩不卡毛片| 91精品国产高清一二三四区| 狠狠色噜噜狠狠狠四色米奇|