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: 国产视频二区在线观看| 午夜影院一区二区| 少妇**毛片| 国产精品无码永久免费888| 96精品国产| 国91精品久久久久9999不卡| 亚洲欧美日韩三区| 狠狠色成色综合网| 中文字幕在线乱码不卡二区区| 亚洲精品国产一区二| 久久国产精品-国产精品| 99国产午夜精品一区二区天美| 欧美亚洲视频二区| 国产vsv精品一区二区62| 亚洲欧洲日本在线观看| 一区二区在线不卡| 久久三级精品| 人人澡超碰碰97碰碰碰| 久久久99精品国产一区二区三区| 亚洲国产精品一区在线| 亚洲伊人久久影院| 搡少妇在线视频中文字幕| 亚洲五码在线| 久久久久久国产一区二区三区| 91精品视频免费在线观看| 小萝莉av| 国产在线一区观看| 午夜肉伦伦影院九七影网| av狠狠干| 91精品丝袜国产高跟在线| 精品国产一级| 午夜亚洲影院| 中文在线一区二区三区| 少妇久久精品一区二区夜夜嗨| 一级女性全黄久久生活片免费| 欧美精品一区久久| 亚洲精品日本无v一区| 国产.高清,露脸,对白| 国产精品影音先锋| 欧美精品粉嫩高潮一区二区| 国产精品乱码一区| 一区二区在线国产| 欧洲国产一区| 国产视频1区2区| 一区二区久久久久| 香蕉久久国产| 欧美一区二区综合| 91看片淫黄大片91| 国产一区不卡视频| 99久久免费精品国产男女性高好| 欧美黑人巨大久久久精品一区| xxxx18日本护士高清hd| 国产午夜一级片| 日韩av不卡一区二区| av午夜剧场| 满春阁精品av在线导航| 扒丝袜网www午夜一区二区三区| 国产精品一区二区日韩新区| 国产精品99在线播放| 在线精品国产一区二区三区88| 国产高清无套内谢免费| 久久夜靖品2区| 亚洲一级中文字幕| 国产色婷婷精品综合在线播放| 久久中文一区| 国产69精品久久久久男男系列| av素人在线| 午夜看大片| 亚洲精品日本久久一区二区三区| 中文字幕日本一区二区| 中出乱码av亚洲精品久久天堂| 亚洲欧洲一二三区| 午夜影院激情| 夜夜躁人人爽天天天天大学生| 香港三日本三级三级三级| 久久精品综合视频| 97欧美精品| 国产欧美一区二区精品久久| 制服.丝袜.亚洲.另类.中文| 久久精品视频中文字幕| 久久99精品国产| 国产一区二区精品在线|