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: 免费看大黄毛片全集免费| 综合国产一区| 日本精品视频一区二区三区| 99久久婷婷国产综合精品电影| 国产精品自产拍在线观看蜜| 99国产超薄丝袜足j在线观看| 亚洲精品乱码久久久久久蜜糖图片 | 亚洲欧美一区二区精品久久久 | 日韩一区二区中文字幕| 午夜精品在线观看| 国产精品一区二| 国产一区在线免费| 国产色婷婷精品综合在线播放| 91亚洲精品国偷拍| 国产视频1区2区| 亚洲va国产2019| 99久久精品免费看国产免费粉嫩| 艳妇荡乳欲伦2| 国产亚洲精品久久久久秋霞 | 久久er精品视频| 91精品视频在线免费观看| 2020国产精品自拍| 国产日韩区| 午夜伦全在线观看| 手机看片国产一区| 色午夜影院| 99精品一级欧美片免费播放| 日韩精品免费一区二区夜夜嗨| 91免费视频国产| 欧美精品国产一区二区| 国产91精品高清一区二区三区| 国产精品一区亚洲二区日本三区 | 国产一区二区三区中文字幕| 亚洲精品久久久久中文第一暮| 性old老妇做受| 亚洲精品性| 亚洲精品一区中文字幕| 国产欧美综合一区| 91久久精品国产91久久性色tv| 狠狠插狠狠干| 午夜电影毛片| 国产日韩一区在线| 国产精品一区二区免费视频| 99国产精品9| 日韩av在线网址| aaaaa国产欧美一区二区| 91精品一区二区中文字幕| 年轻bbwwbbww高潮| 精品国产乱码久久久久久虫虫| 农村妇女毛片精品久久| 在线精品视频一区| 99精品欧美一区二区| 精品国产一区二区三区麻豆免费观看完整版 | 视频一区二区国产| 欧美激情综合在线| 91精品系列| 欧美日韩一区电影| av狠狠干| 男人的天堂一区二区| 国产中文字幕91| 国产性猛交xx乱视频| 日韩av片无码一区二区不卡电影| 亚洲国产精品国自产拍av| 欧美日韩国产精品一区二区| 亚洲乱码一区二区三区三上悠亚 | 国产在线欧美在线| 日韩精品免费看| 国产一级一区二区三区| 欧美一区二区伦理片| 午夜av影视| 亚洲精品日韩激情欧美| 久久91精品国产91久久久 | 中文字幕国内精品| 国产91久久久久久久免费| 高清欧美xxxx| av国产精品毛片一区二区小说| 亚洲国产欧美一区| 国产91久| 久久精品视频3| 亚洲高清毛片一区二区| 国产精品视频免费看人鲁| 国产精品人人爽人人做av片|