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: 国产日韩欧美三级| 一区二区三区日韩精品| 国产精品免费自拍| 日本午夜无人区毛片私人影院| 黄色av免费| 99精品一级欧美片免费播放| 亚洲欧美色图在线| 国产午夜一级一片免费播放| 国产精品久久久久四虎| 国产一区二区综合| 国产一区二区视频免费在线观看 | 国产麻豆一区二区三区在线观看| 国产黄色网址大全| 国精偷拍一区二区三区| 黑人巨大精品欧美黑寡妇| 国产九九影院| 91久久国产视频| 在线视频国产一区二区| 国产福利一区在线观看| 国产91丝袜在线播放动漫| 91国产一区二区| 黑人巨大精品欧美黑寡妇| 亚洲国产精品第一区二区| 亚洲国产精品日本| 午夜国产一区二区三区四区| 国产精品电影一区二区三区| 91高清一区| 午夜影院黄色片| 日本丰满岳妇伦3在线观看 | 欧美在线观看视频一区二区| 午夜亚洲影院| 免费a一毛片| 99国产精品9| 欧美一级片一区| 亚洲国产精品区| xxxxx色| 欧美亚洲视频二区| 欧美乱妇在线视频播放| 国产伦精品一区二区三区电影| 日本精品三区| 99热久久这里只精品国产www| 一区二区三区国产视频| 伊人欧美一区| 国产一级精品在线观看| 日韩一级片在线免费观看| 夜夜躁人人爽天天天天大学生| 久久久精品欧美一区二区| 亚洲精品国产精品国自| 国产精品九九九九九| 91麻豆精品国产91久久久更新时间| 国产一区二区激情| 丰满岳乱妇在线观看中字| 国产呻吟久久久久久久92| 国产精品不卡在线| 日韩午夜三级| 国产亚洲精品久久久久动| 国产1区2| 美女直播一区二区三区| 久久久久久久久亚洲精品一牛| 综合久久国产九一剧情麻豆| 久久九九亚洲| 国产伦理精品一区二区三区观看体验 | 日本午夜一区二区| 99精品欧美一区二区三区美图| 91亚洲欧美强伦三区麻豆| 91久久精品在线| 国产天堂第一区| 国产精品天堂| 日韩av免费网站| 欧美精品免费看| 亚洲一区二区三区加勒比| 中文av一区| 国产精品久久久久久亚洲美女高潮| 91午夜在线观看| 蜜臀久久99精品久久久| 四虎国产精品久久| 中文在线√天堂| 国产一区二区视频免费观看| 色一情一交一乱一区二区三区| 欧美xxxxxhd| 处破大全欧美破苞二十三| 欧美精品国产精品|