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: 国产一二区精品| 国产一区二区午夜| 国内久久久| 欧美一区二区精品久久911| 亚洲自拍偷拍中文字幕| 欧美激情精品一区| 性生交大片免费看潘金莲| 国产精品欧美一区二区三区| 丰满少妇高潮惨叫久久久| 亚洲欧美视频一区二区| 妖精视频一区二区三区| 99re久久精品国产| 久久久精品99久久精品36亚| 日韩精品一区二区亚洲| bbbbb女女女女女bbbbb国产| 亚洲国产精品激情综合图片| 久久99亚洲精品久久99果| 九一国产精品| 国产精品免费一区二区区| 午夜一区二区三区在线观看| 欧美日韩一区二区三区69堂| 精品视频久| 久久久精品免费看| 亚洲国产精品一区在线观看| 国产欧美亚洲精品| 91精品国产综合久久福利软件| 国产精品日韩一区二区三区| 国产精品美女一区二区视频| 91精品视频在线免费观看| 欧美一区二区三区三州| 免费看欧美中韩毛片影院| 欧美在线视频二区| 色综合久久网| 国产欧美精品va在线观看| 国产精品国精产品一二三区| 国产在线精品区| 国产天堂一区二区三区| 日韩精品久久久久久久的张开腿让| 精品日韩久久久| 97视频一区| 国产一区二区黄| 国产精品伦一区二区三区级视频频 | 国产精品视频一二区| 久久国产欧美一区二区免费| 国产精品一二三区视频出来一| 热久久一区二区| 玖玖精品国产| 日韩午夜毛片| 亚洲国产精品国自产拍av| 国产视频二区| 久久国产精彩视频| 国产一区三区四区| 日韩av不卡一区| 国产日韩一区在线| 中文字幕在线视频一区二区| 日本护士hd高潮护士| 国产全肉乱妇杂乱视频在线观看| 国产精品女人精品久久久天天| 国产伦精品一区二区三区照片91 | 国产超碰人人模人人爽人人添| 99久久精品国产系列| 午夜影院5分钟| 91久久国产视频| 欧美精品一区二区三区视频| 国产欧美精品久久| 国产日产精品一区二区| 国产欧美一区二区三区在线播放| 日韩一级精品视频在线观看| 国产精品一区二| 久久99久久99精品免观看软件 | 久久精品一| 男人的天堂一区二区| 久久精品综合视频| 午夜影院h| 91久久国产露脸精品| 国产乱一乱二乱三| 久久婷婷国产香蕉| 精品一区中文字幕| 国产主播啪啪| 国产69精品福利视频| 国产午夜亚洲精品| 麻豆国产一区二区|