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: ass韩国白嫩pics| 91视频一区二区三区| 久久久久国产一区二区三区不卡| 久久午夜鲁丝片午夜精品| 亚洲精品国产主播一区| 国产精品视频一区二区在线观看 | 99精品区| 日韩av中文字幕第一页| 99精品一区二区| 国产69精品久久久久9999不卡免费| 日韩久久精品一区二区三区| 午夜av电影网| 国产v亚洲v日韩v欧美v片| 国产日韩欧美另类| 国产乱人乱精一区二视频国产精品| 国产精品一区二区av麻豆| 99国产精品一区| 亚洲国产精品麻豆| 欧美亚洲另类小说| 国产精欧美一区二区三区久久久| 欧美一区二区三区黄| 黄毛片在线观看| 精品少妇一区二区三区| 欧美在线观看视频一区二区三区 | 激情久久一区| 国产一区二区三区黄| 91午夜精品一区二区三区| 日韩精品午夜视频| 亚洲制服丝袜在线| 国产aⅴ精品久久久久久| 国产91清纯白嫩初高中在线观看| 91久久精品国产亚洲a∨麻豆| 午夜生活理论片| 国产一卡二卡在线播放| 国产精品麻豆自拍| 亚洲精品日韩在线| 91精品一区在线观看| 欧美激情视频一区二区三区| 91麻豆精品国产91久久久更新资源速度超快 | 日本高清不卡二区| 欧美视屏一区| 亚洲乱强伦| 美国三级日本三级久久99| 国产免费一区二区三区四区五区 | 日本二区在线播放| 91精品国产91热久久久做人人| 亚洲天堂国产精品| 久久97国产| 欧美三级午夜理伦三级中视频| 狠狠插狠狠爱| 亚洲区在线| 午夜伦情电午夜伦情电影| 免费欧美一级视频| 国产精品久久久麻豆| 日韩欧美视频一区二区| 精品久久久久一区二区| 久久婷婷国产综合一区二区| 99久热精品| 久久夜色精品久久噜噜亚| 国产精品美乳在线观看| 午夜天堂在线| 日本一区二区三区中文字幕| 亚洲精品日本久久一区二区三区| 99精品欧美一区二区三区美图| 综合久久色| 国产精自产拍久久久久久蜜| 精品久久二区| 亚洲v欧美v另类v综合v日韩v| 国产一二区视频| 日韩av中文字幕第一页| 亚洲国产精品肉丝袜久久| 精品视频久| 91精品系列| 日韩美一区二区三区| 精品无人国产偷自产在线| 日本精品在线一区| 国产精品亚洲一区| 国产亚洲精品久久久久久久久动漫| 亚洲日韩aⅴ在线视频| 91人人爽人人爽人人精88v| 亚洲精品91久久久久久| 91精品久|