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: 久久久久亚洲最大xxxx| 精品久久一区| 国产91在| 挺进警察美妇后菊| 99三级视频| 日韩欧美高清一区二区 | 久久网站精品| 久久第一区| 999久久久国产| 国产第一区二区| 亚洲国产一区二| 久久久久久久亚洲国产精品87| 国产精品日韩精品欧美精品| 欧美日韩中文字幕三区| 91精品国产91热久久久做人人| 欧美日韩亚洲另类| 大桥未久黑人强制中出| 在线国产精品一区二区| 欧美黑人巨大久久久精品一区| 欧美资源一区| 亚洲精品久久久久中文字幕欢迎你 | 日本xxxx护士高潮hd| 欧美二区精品| 最新国产精品久久精品| 日本一区二区在线电影| 欧美国产一二三区| 国产一区免费在线| 国产一区2| 高清人人天天夜夜曰狠狠狠狠| 日日夜夜一区二区| 中文字幕亚洲欧美日韩在线不卡| 销魂美女一区二区| 99久久国产免费| 日韩精品中文字幕一区二区三区 | 国产www亚洲а∨天堂| 亚洲自偷精品视频自拍| aaaaa国产欧美一区二区| 国产午夜亚洲精品午夜鲁丝片| 国产精品亚洲精品一区二区三区| 国产高清在线观看一区| 亚洲乱亚洲乱妇28p| 97香蕉久久国产超碰青草软件 | 国产精品久久免费视频| 国产精品女同一区二区免费站| 亚洲精品97久久久babes| 国产精品国外精品| 国产69精品久久久久777| 精品中文久久| 色一情一乱一乱一区免费网站 | 国产一区观看| 97人人模人人爽人人喊38tv| 国产二区视频在线播放| 美女直播一区二区三区| 免费91麻豆精品国产自产在线观看| 日本一区二区三区免费播放| 欧美一区二区三区三州| 亚洲国产aⅴ精品一区二区16| 国产精品中文字幕一区二区三区 | 国产精品日本一区二区不卡视频| 欧美一级久久精品| 国内揄拍国产精品| 狠狠干一区| 国产免费区| 狠狠色依依成人婷婷九月| 日韩一区二区精品| 中文字幕一级二级三级| 国产精品九九九九九九| 亚洲精品少妇一区二区| 热久久一区二区| 国产伦精品一区二区三区免| 久久久中精品2020中文| 亚洲精品乱码久久久久久按摩| 日本精品一区二区三区视频| 亚洲码在线| 国产乱xxxxx国语对白| 肉丝肉足丝袜一区二区三区| 91麻豆产精品久久久| 三级视频一区| 亚洲欧美v国产一区二区| 久久精品视频3| 欧美一区免费| 国产欧美日韩精品一区二区图片 |