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: 国产一区日韩精品| 中文字幕视频一区二区| 国产有码aaaae毛片视频| 国产一区二区在| 91人人爽人人爽人人精88v| 国产精品一区二区在线看| 狠狠躁夜夜| 日本丰满岳妇伦3在线观看| 中文字幕视频一区二区| 国产在线不卡一| 欧美日韩国产一级| 日韩毛片一区| 97视频一区| 美女销魂免费一区二区| 亚洲色欲色欲www| 日本一区二区在线电影| 国产真实一区二区三区| 蜜臀久久99静品久久久久久 | 精品a在线| 蜜臀久久99静品久久久久久| 天堂av一区二区| 日韩av电影手机在线观看| 91精品系列| 国产麻豆精品久久| 夜夜躁人人爽天天天天大学生| 少妇厨房与子伦免费观看| 国产精选一区二区| 丰满少妇高潮惨叫久久久一| 国产农村妇女精品一二区| 国产91免费在线| 99国产精品久久久久| 久久一区二区三区欧美| 久久午夜鲁丝片午夜精品| 小萝莉av| 日韩欧美精品一区二区三区经典| 国产一区二区三区四区五区七| 国产99小视频| 日韩精品中文字| 一级久久精品| 91精品资源| 日韩亚洲精品在线| 日韩av在线高清| 欧美日韩一区免费| 日韩毛片一区| av午夜剧场| 国产精品伦一区二区三区级视频频| 国产1区2区3区中文字幕| 真实的国产乱xxxx在线91| 国产精品1234区| 国产91清纯白嫩初高中在线观看| 国产精品亚洲精品| 91片在线观看| 日本一区二区免费电影| 一级久久久| 欧美二区在线视频| 日韩午夜毛片| 国产伦理久久精品久久久久| 久久久久一区二区三区四区| 国产精品高潮呻吟视频| 日本道欧美一区二区aaaa| 亚洲欧美国产一区二区三区 | 精品无人国产偷自产在线| 久久夜色精品国产亚洲| 国产一区三区四区| 国产精品久久久久久久久久久久久久久久| 久久九精品| 国产一区精品在线观看 | 午夜亚洲影院| 久久综合久久自在自线精品自| 国产偷国产偷亚洲清高| 国产91丝袜在线| 色婷婷噜噜久久国产精品12p| 91精品福利在线| 国产69精品久久久久777糖心| 日韩午夜电影在线| 午夜亚洲影院| 午夜毛片电影| 免费视频拗女稀缺一区二区| 欧美日韩一级二级三级| 色狠狠色狠狠综合| 亚洲欧美色图在线| 国产区二区|