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Development of Copper Gear

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Development of Copper Gear

Release date:2019-09-24 14:13 source:Original click:

  Copper gears have been used in transmission for a long time. Aristotle, an ancient Greek philosopher, expounded the problem of rotational motion transmitted by bronze or cast iron copper gears in his book Mechanical Problems over 300 B.C. A complete set of wheels has been used in the compass car invented in ancient China. However, ancient copper gears were made of wood or cast with metal, which could only transfer the rotary motion between shafts, and could not guarantee the stability of transmission. The bearing capacity of copper gears was also very small. According to historical records, copper gears have been used in ancient China from 400 to 200 B.C. The bronze gears unearthed in Shanxi Province are the oldest copper gears ever discovered. As a guide car reflecting the achievements of ancient science and technology, the mechanical device with copper gear mechanism as the core is the bronze gear mechanism. At the end of the 17th century, people began to study the correct transmission of the shape of the moving gear teeth. In the 18th century, after the European Industrial Revolution, the application of copper gear transmission has become more and more widespread. First, the cycloidal copper gear was developed, then the involute copper gear. Until the beginning of the 20th century, the involute copper gear has occupied an advantage in the application.

  Copper gear is a toothed mechanical part that can mesh with each other. It is widely used in mechanical transmission and the whole mechanical field. Modern copper gear technology has reached: copper gear modulus O.004-100mm; copper gear diameter from 1mm to 150m; transmission power up to 100,000 kW; speed up to hundreds of thousands of revolutions/minutes; the highest circumferential speed up to 300 meters/second.

  With the development of production, the smoothness of copper gears is paid attention to. In 1674, Danish astronomer Romer first proposed to use the epicycloid as the tooth profile curve to obtain a smooth running copper gear.

  During the Industrial Revolution of the 18th century, the technology of copper gears developed rapidly, and a great deal of research has been done on copper gears. In 1733, French mathematician Kami published the basic law of tooth profile engagement; in 1765, Swiss mathematician Euler suggested using involute as tooth profile curve.

  The hobbing machine and gear shaper, which appeared in the 19th century, solved the problem of mass production of high precision copper gears. In 1900, Puford installed differential device for hobbing machine, which can process helical copper gear on hobbing machine. Since then, hobbing machine hobbing copper gear has been popularized. Generation method processing copper gear occupies an overwhelming advantage. Involute copper gear has become the most widely used copper gear. In 1899, Rachel first implemented the modified copper gear scheme. Modified copper gears can not only avoid undercutting, but also make up center distance and improve the bearing capacity of copper gears. In 1923, Wildhaber first put forward the copper gear with circular arc profile. In 1955, Sonovikov made a thorough study on the copper gear with circular arc profile, and the copper gear with circular arc profile was applied in production. The bearing capacity and efficiency of this kind of copper gear are high, but it is not as easy to manufacture as the involute copper gear, which needs further improvement.

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