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: 国产日韩欧美亚洲综合| 日本一二三区视频在线| 国产精品电影一区二区三区| 国产三级欧美三级日产三级99| 日本福利一区二区| 扒丝袜网www午夜一区二区三区| 国产精品高潮呻吟视频| 久久精品男人的天堂| 国产精品高潮呻吟视频| 亚洲精品www久久久久久广东| 扒丝袜网www午夜一区二区三区| 精品国产乱码久久久久久软件影片| 国产一区二区91| sb少妇高潮二区久久久久| 91一区二区三区久久国产乱| 国产一级不卡视频| 国产精品麻豆99久久久久久| 少妇av一区二区三区| 国产精品一二三四五区| 欧美日韩一区电影| 97人人澡人人爽人人模亚洲| 色吊丝av中文字幕| 精品欧美一区二区精品久久小说| 精品久久久久久亚洲综合网| 精品久久久综合| 国产精品九九九九九| 国产精品乱战久久久| 国产一卡二卡在线播放| 国产日韩欧美亚洲| 国产精品久久久久久亚洲美女高潮| 韩国女主播一区二区| 欧美日韩激情一区二区| 制服丝袜视频一区| 亚洲精品日本久久一区二区三区| 亚洲乱在线| 中文字幕制服狠久久日韩二区| 午夜爽爽视频| 精品国产乱码久久久久久久久| 亚洲欧美日韩精品在线观看| 国产91久| 久久精品国产精品亚洲红杏| 欧美67sexhd| 久久久精品免费看| 亚洲国产一二区| 亚洲国产一二区| 香蕉av一区| 中出乱码av亚洲精品久久天堂| 国产精品久久人人做人人爽| 久久久久亚洲精品视频| 国产精品麻豆一区二区| 国产一区午夜| 精品午夜电影| 国产一区二区三区网站| 国产精品美女一区二区视频| 午夜精品99| 九一国产精品| 亚洲欧洲一区| 久久国产精品网站| 国产69精品久久久久久| www色视频岛国| 日本边做饭边被躁bd在线看| 肉丝肉足丝袜一区二区三区| 午夜av网址| 亚洲制服丝袜中文字幕| 黄色香港三级三级三级| 久久久久久国产精品免费| 午夜电影毛片| 亚洲精品日日夜夜| 久久久久国产精品嫩草影院| 国产免费一区二区三区四区| 日韩一区二区中文字幕| 亚洲欧美日韩在线看| 久久精品国语| 国产精品一区不卡| 国产欧美一区二区三区沐欲| 肥大bbwbbwbbw高潮| 国产一区二区在线观看免费| 国产区二区| 国产精品欧美一区乱破| 夜夜嗨av一区二区三区中文字幕| 狠狠色狠狠色88综合日日91| 国产91在线拍偷自揄拍|