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: 97视频一区| 国产精品亚洲第一区| 91精品中综合久久久婷婷| 99re热精品视频国产免费| 99视频国产精品| 91精品久久天干天天天按摩| 国久久久久久| 亚洲少妇中文字幕| 欧美精品粉嫩高潮一区二区| 国产一区二区视频播放| 日韩精品一区中文字幕| 国产精品亚洲第一区| 亚洲女人av久久天堂| 88国产精品视频一区二区三区| 亚洲精品日韩激情欧美| 亚洲精品一区二区另类图片| 精品国产一区二| 一区不卡av| 中文字幕av一区二区三区高| 精品一区二区超碰久久久| 午夜黄色网址| 亚洲精品456| 亚洲在线久久| 欧美精品日韩一区| 色婷婷噜噜久久国产精品12p | 久久精品综合| 97国产婷婷综合在线视频,| 欧美激情视频一区二区三区免费| 色狠狠色狠狠综合| 国产一区欧美一区| 国产精品久久久久精| 午夜欧美影院| 日韩av在线影视| 日韩av三区| 国产精品九九九九九| 国产女性无套免费看网站| 99国产精品免费| 亚洲午夜精品一区二区三区| 欧美67sexhd| 91精品夜夜| 午夜一区二区视频| 久久99亚洲精品久久99果| 国产一区2| 在线亚洲精品| 国产天堂一区二区三区| 久久99国产视频| 国产精品一二三在线观看| 免费看性生活片| 国产一区二区电影在线观看| 玖玖玖国产精品| 久久人人97超碰婷婷开心情五月| 国产欧美精品一区二区在线播放| 国产精品18久久久久白浆| 日韩精品一区二区免费| 国内精品久久久久久久星辰影视| 久久er精品视频| 性生交片免费看片| 亚洲欧美日韩一级| 欧美精品日韩一区| 精品国产精品亚洲一本大道| 久久国产欧美一区二区三区精品| 国产精品高潮在线| 国产69精品久久99不卡免费版| 亚洲欧美色一区二区三区| 欧美日韩中文国产一区发布 | 97人人澡人人爽91综合色| 国产精品欧美久久| 国产精品久久久不卡| 国产免费区| 欧美日韩亚洲另类| 97涩国一产精品久久久久久久| 亚洲福利视频二区| 国产97免费视频| 日韩欧美国产高清91| 国产日韩精品久久| 国产欧美一区二区精品久久久| 亚洲国产一区二区精华液| 国产理论一区| 日韩一区二区精品| 欧美高清xxxxx| 国产精品96久久久| 国产精品国精产品一二三区|