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History Of Transmission Gear Development

May 09, 2020

In the west, the ancient Greek philosopher Aristotle in 300 BC in the "mechanical problem," the problem of using bronze or cast iron gear to transmit rotational motion.The famous Greek scholars Aristotle and Archimedes both studied gears, and the famous Greek inventor gudysibios applied this mechanism to the notch by inserting a pin into the edge of a circular table to engage it with the pin wheel.This was about 150 BC.In 100 BC, herren, an alexandrian inventor, invented the speedometer, which used a gear.In the 1st century AD, the Roman architect bidobis made a waterwheel pulverizing machine that also used gears.By the 14th century, gears were being used on clocks and watches.

In the early years of the eastern han dynasty (1st century AD), there were already word gears.The south-pointing cart and drum cart in The Three Kingdoms period had adopted the gear transmission system.The water rotary mill invented by du yu in the jin dynasty was to transfer the power of the water wheel to the stone mill through the gear.The earliest record of gear drive system in history books is the description of the armillary instrument made by liang ling zan in 725.Waterborne instruments and elephant platforms (see ancient Chinese timepieces) made in the northern song dynasty used a complex gear system.In the Ming dynasty, MAO yuanyi's book wubei zhi (written in 1621) recorded a rack and pinion drive

Iron bronze gear at the end of the warring states period

.In 1956, an excavation of the ancient city of anwuji, hebei province, found an iron spur gear, wheel diameter of about 80 mm, although has been incomplete, but the iron quality is better, after research, confirmed that it is the end of the warring states period (3 centuries BC) to the western han dynasty (206 BC - AD 24) products.In 1954, a bronze spike gear was unearthed in lujiaya, yongji county, Shanxi Province.With reference to the unearthed objects in the same pit, it can be concluded that they are relics of the qin dynasty (221 ~ 206 BC) or the early western han dynasty, with wheels of 40 teeth and a diameter of about 25 mm.The use of the spur gear, so far not found in written records, is speculated to be used for braking to prevent axle reversal.In 1953, a pair of bronze zigzag gears was unearthed in hongqing village, changan county, shaanxi province.According to the analysis of the tomb structure and burial objects, it can be concluded that the gears were from the early eastern han dynasty.Both wheels have 24 teeth and are about 15 mm in diameter.Hengyang and other places also found the same herringbone gear.

2019-12-05-齿轮