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: 性xxxxfreexxxxx交| 国产精品久久久久久久久久久不卡| 欧美精品在线不卡| 精品一区二区三区自拍图片区| 精品国产一区二区三| 97久久超碰国产精品| 中文字幕精品一区二区三区在线| 99国产精品永久免费视频| 久久国产精品精品国产| 狠狠色丁香久久婷婷综| 国内久久久| 精品日韩久久久| 天啦噜国产精品亚洲精品| 99久久国产综合| 国产人伦精品一区二区三区| 日日夜夜精品免费看| 日韩精品久久久久久久的张开腿让 | 69久久夜色精品国产69–| 午夜社区在线观看| 欧美国产精品久久| 91精品免费观看| 日韩av在线资源| 欧美在线视频二区| 99国产精品9| 午夜特级片| 91丝袜国产在线观看| 91精品国产综合久久国产大片 | 精品午夜电影| 久久一二区| 欧美精品日韩精品| 欧美综合在线一区| 夜色av网| 蜜臀久久99静品久久久久久| 特高潮videossexhd| 欧美一级片一区| 色噜噜狠狠狠狠色综合久| 精品少妇一区二区三区| **毛片在线免费观看| 国产区91| 欧美日韩偷拍一区| 日韩欧美高清一区二区| 国产69精品久久久久久野外| 日本一级中文字幕久久久久久| 中文字幕另类日韩欧美亚洲嫩草| 午夜影院试看五分钟| 国产日韩欧美一区二区在线播放| 狠狠色狠狠色综合久久第一次| 欧美三级午夜理伦三级老人| 国产一区在线精品| 日韩av一区二区在线播放| 国产在线精品二区| 亚洲乱视频| 丰满少妇高潮惨叫久久久一| 一区二区三区欧美在线| 91免费看国产| 国产精品综合在线观看| 精品国产一区二区三区免费| 中文字幕在线乱码不卡二区区| 国产又黄又硬又湿又黄| 久久99精品国产99久久6男男| 日本福利一区二区| 国产精品一区二区6| 伊人精品一区二区三区| 91亚洲欧美强伦三区麻豆 | 精品videossexfreeohdbbw| 欧美日韩一区二区三区精品| 国产一区二区在| 亚洲国产精品综合| 91秒拍国产福利一区| 欧美一级久久精品| 狠狠色噜噜狠狠狠色综合| 国产日韩欧美网站| 国产精品国外精品| 午夜免费av电影| 热久久一区二区| 亚洲乱码av一区二区三区中文在线:| 午夜伦理在线观看| 国内精品久久久久影院日本| 99久久久久久国产精品| 国产天堂第一区| 日韩av中文字幕在线| 福利片91|