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: 精品国产乱码久久久久久虫虫 | 性色av色香蕉一区二区| 久久久久久综合网| 欧美日韩国产一级| 中文在线一区| 国产精品综合在线观看| 精品国产伦一区二区三区| 高清欧美精品xxxxx| 精品久久久久一区二区| 国产精品久久免费视频| 欧美国产精品久久| 欧美视频1区| 午夜情所理论片| 又黄又爽又刺激久久久久亚洲精品| 日韩欧美精品一区二区| 91精品高清| 国产91在| 日韩国产精品一区二区| 亚洲精品国产精品国自产网站按摩| 狠狠色噜噜综合社区| 欧美日韩一区二区三区不卡| 在线视频国产一区二区| 国产在线精品一区二区在线播放| 夜夜嗨av一区二区三区中文字幕 | 日韩午夜一区| 99精品区| 国产在线一二区| 国产午夜一区二区三区| 久久精品一区二区三区电影| 国产精品一二三四五区| 在线国产精品一区二区| 国产精品亚洲第一区| 99久久夜色精品国产网站| 欧美国产在线看| 国产乱一乱二乱三| 农村妇女毛片精品久久| 精品国产二区三区| 国产乱人乱精一区二视频国产精品 | 夜夜精品视频一区二区| 国产福利一区在线观看| 国产一区二区资源| 国产电影一区二区三区下载| 亚洲欧美精品suv| 国产福利一区在线观看| 夜夜爽av福利精品导航| 国产视频一区二区三区四区| 日韩欧美中文字幕一区| 国产乱子一区二区| 久久精品国语| 久久99精品久久久大学生| 午夜av片| 麻豆国产一区二区三区| 久久久久久久亚洲视频| 玖玖精品国产| 一区不卡av| 中文字幕av一区二区三区高| 欧美精品八区| 日本高清二区| 国产精品一区二区不卡| 国产一区在线免费观看| 欧美日韩国产一二| 欧美激情精品久久久久久免费| 久久激情图片| 人人澡超碰碰97碰碰碰| 久久精品麻豆| 国产精品1区二区| 国产69精品久久99不卡免费版| 日本不卡精品| 精品一区二区在线视频| 国产精品天堂| 日本精品一二三区| 亚洲二区在线播放视频| 国产精品一二三四五区| 午夜黄色一级电影| 四虎国产精品久久| 国产精品视频免费一区二区| 欧美精品久久一区二区| 三级视频一区| 91亚洲精品国偷拍| 国产电影精品一区二区三区| 国产偷亚洲偷欧美偷精品| 欧美一区二区三区久久精品|