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: 日韩av免费网站| 99久久婷婷国产精品综合| 精品国产一二三四区| 精品国产一级| 中文字幕制服丝袜一区二区三区| 国产在线不卡一区| 欧美精品一区久久| 日本美女视频一区二区三区| 香蕉av一区二区| 国产1区2区视频| 午夜一级免费电影| 国产乱xxxxx国语对白| 色婷婷综合久久久中文一区二区| 中文字幕国内精品| 97人人模人人爽视频一区二区 | 国产午夜一级片| 国产精品久久久久久久久久不蜜月| 精品a在线| 在线播放国产一区| 国产在线不卡一区| 国产精品高潮呻吟视频| 国产高清一区二区在线观看| 国产日产高清欧美一区二区三区| 制服丝袜二区| 91久久香蕉| 91婷婷精品国产综合久久| 久久夜靖品2区| 欧美日韩一区视频| 国产玖玖爱精品视频| 狠狠色噜噜狠狠狠狠视频| 国产呻吟久久久久久久92| 日本三级香港三级| 欧美大成色www永久网站婷| 91精品丝袜国产高跟在线| 国产欧美视频一区二区三区| 国产精一区二区| 在线观看欧美日韩国产| 中文字幕一区一区三区| 久久99精品国产麻豆宅宅| 国产主播啪啪| 午夜av男人的天堂| 欧美三级午夜理伦三级中视频| 91社区国产高清| 93久久精品日日躁夜夜躁欧美| 久久综合二区| 中文乱码在线视频| 香港三日本三级三级三级| 91精品一区二区中文字幕| 久久久综合香蕉尹人综合网| 97人人模人人爽人人喊小说| 国产1区2区3区中文字幕| 欧洲在线一区| 免费91麻豆精品国产自产在线观看| 色天天综合久久久久综合片| 91精品www| 久久久精品视频在线| 欧美67sexhd| 91午夜精品一区二区三区| 国产欧美亚洲一区二区| 狠狠色噜噜狠狠狠四色米奇| 欧美精品六区| 亚洲国产精品入口| 国产色一区二区| 欧美二区在线视频| av狠狠干| 国模一区二区三区白浆| 日韩欧美一区二区在线视频| 欧美人妖一区二区三区| 国产一区亚洲一区| 91精品国产一区二区三区| 浪潮av色| 久久精品国产久精国产| 91精品啪在线观看国产| 久久一区欧美| 国产亚洲精品久久777777| 欧美精品在线视频观看| 国产乱了高清露脸对白| 久久免费视频一区| 亚洲精品久久久久中文字幕欢迎你 | 欧美日韩久久一区| xxxx18日本护士高清hd| 国语对白一区二区三区|