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99免费视频| 国产一区第一页| 在线精品视频一区| 国产69精品久久久久久久久久| 国产一区www| 国产免费一区二区三区四区| 狠狠色噜噜狠狠狠狠69| 欧美精品乱码视频一二专区| 国产精品一二二区| 激情久久一区二区| 四季av中文字幕一区| 午夜伦情电午夜伦情电影| 亚洲国产欧美一区二区丝袜黑人| 国产欧美一区二区精品久久| 国产剧情在线观看一区二区| 亚洲自偷精品视频自拍| 97一区二区国产好的精华液| 思思久久96热在精品国产| 国产一区激情| 91看片免费| 69精品久久| 国产精品白浆一区二区| xxxxhdvideosex| 国产午夜亚洲精品午夜鲁丝片 | 国产69精品久久久久9999不卡免费| 性欧美激情日韩精品七区| 精品少妇一区二区三区| 欧美一级久久久| 国产午夜亚洲精品午夜鲁丝片| 亚洲美女在线一区| 日韩精品一区二区免费| 特级免费黄色片| 日韩亚洲精品视频| 亚洲国产一区二| 久久国产精品久久| 国产精品第56页| 国产99久久久久久免费看| aaaaa国产欧美一区二区| 久久精品国产99| 久久久一区二区精品| 自拍偷在线精品自拍偷无码专区| 亚洲精品日本久久一区二区三区 | 欧美一区二区三区在线免费观看| 国产乱子伦农村xxxx| 99久久婷婷国产综合精品草原| 中文字幕一区二区三区免费| 国产精品1234区| 久久久久亚洲最大xxxx| 国产精品一级在线| 欧美高清xxxxx| 欧美日韩一区二区三区精品| 欧美日韩激情一区二区| 亚洲精品一区二区三区香蕉| 午夜影院黄色片| 精品国产一区二区三区免费| 国产精品一级在线| 性刺激久久久久久久久九色| 国产精品高潮呻| 国模少妇一区二区三区| 午夜av资源| 国产一级片子| 亚洲国产精品麻豆| 国产日韩欧美专区| 国产精品9区| 精品国产1区2区3区| 亚洲精品日韩精品| 国产中文字幕一区二区三区 | 国产日韩麻豆| 亚洲欧美视频一区二区| 少妇厨房与子伦在线观看| 夜夜躁日日躁狠狠躁| 国产精品日韩电影| 在线观看v国产乱人精品一区二区| 国产呻吟久久久久久久92| 欧洲亚洲国产一区二区三区| 中文字幕区一区二| 国产午夜精品一区理论片飘花 | 久久精品国产精品亚洲红杏| 99re热精品视频国产免费 | 欧美日韩一级在线观看| 国产jizz18女人高潮| 国产麻豆精品一区二区|