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.高清,露脸,对白| 鲁丝一区二区三区免费观看| 国产88av| 精品久久久久一区二区| 天摸夜夜添久久精品亚洲人成| 国产一区2| 狠狠色噜噜狠狠狠狠777| 精品videossexfreeohdbbw| 欧美视屏一区| 性欧美1819sex性高播放| 日韩av在线播放网址| 国产欧美二区| 丝袜诱惑一区二区三区| 久久影院国产精品| 91波多野结衣| 一区二区三区欧美日韩| 91一区二区三区视频| 99国产精品久久久久99打野战| 狠狠色狠狠色综合久久一| 91午夜在线观看| 欧美一区二粉嫩精品国产一线天 | 高清国产一区二区| 国产精品麻豆自拍| 狠狠色丁香久久婷婷综| 一区二区免费在线观看| 91夜夜夜| 亚洲欧美日韩另类精品一区二区三区| 97人人模人人爽视频一区二区| 国产理论一区二区三区| 国产在线一卡二卡| 玖玖精品国产| 精品一区二区三区影院| 天天干狠狠插| 精品国产免费久久| 国产在线一区观看| 狠狠色噜噜狠狠狠狠2021天天| 97涩国一产精品久久久久久久| 久久婷婷国产香蕉| 国内精品99| 国产亚洲精品久久19p| 国产69精品久久99不卡解锁版| 久久99精品久久久大学生| 福利片午夜| 精品a在线| 日韩精品一区在线观看| 99精品小视频| 国产在线一区观看| 伊人久久婷婷色综合98网| 日韩午夜三级| 中文字幕在线视频一区二区| av午夜电影| 91久久香蕉国产日韩欧美9色| 日本一二三区视频在线| 91精品国产91热久久久做人人| 国产精品乱码久久久久久久| 精品久久久久久久免费看女人毛片| 夜夜嗨av色一区二区不卡| 亚洲欧美另类综合| 99国产精品免费| 精品国产区| 国产69精品久久久久9999不卡免费| 国产伦精品一区二区三区免| 日韩亚洲精品视频| 国内精品国产三级国产99| 午夜片在线| 欧美日韩卡一卡二| 中文字幕一区二区三区免费| 99热一区二区| 97香蕉久久国产超碰青草软件| 国产在线干| 国产精品欧美日韩在线| 欧美日韩三区二区| 日韩精品免费一区二区夜夜嗨| 99re国产精品视频| 国产一区欧美一区| 狠狠综合久久av一区二区老牛| 久久福利免费视频| 久久人做人爽一区二区三区小说| 岛国精品一区二区| 欧美极品少妇xxxxⅹ| 97国产精品久久久| 2018亚洲巨乳在线观看|