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Origin and Development History of Gear [Sani Transmission]

Gears are transmission parts that have been used since the beginning of the new era in order to transfer rotating force.

Gear has a long history in China. According to historical records, gears were used in ancient China as far as 400-200 BC. The bronze gears unearthed in Shanxi Province are ancient gears that have been found so far. As a guide car reflecting ancient scientific and technological achievements, it is a mechanical device with gear mechanism as the core. In the Renaissance of Italy in the second half of the 15th century, Leonardo da Vinci, a famous all rounder, made great achievements not only in culture and art, but also in the history of gear technology. After more than 500 years, the current gear still retains the original sketch of that time.

As early as 1694, Philippe de lahire, a French scholar, first proposed that involute can be used as tooth profile curve. In 1733, Camus M. proposed that the common normal of the tooth contact point must pass through the node on the central line. He considered the meshing state of two tooth surfaces and established the concept of contact point trajectory. In 1765, Euler of Switzerland put forward the mathematical basis for the analytical study of involute tooth profile, and clarified the relationship between the curvature radius of tooth profile curve and the position of curvature center of a pair of meshing gears. Later, Savary further completed this method and became the Euler Savery equation. Robert Willis, who contributed to the application of involute profile, proposed that involute gear has the advantage of constant angular speed ratio when the center distance changes. In 1873, German engineer H. PPE puts forward the involute profile of gears with different number of teeth when the pressure angle changes, thus laying the ideological foundation of modern modified gears. It was not until the end of the 19th century that the principle of generating gear cutting method and the special machine tools and cutting tools used for gear cutting appeared one after another, which made the gear processing more perfect.

It was not until the end of the 17th century that people began to study the tooth shape which can correctly transmit motion. In the early 20th century, the involute gear was widely used in Europe, and then the cycloid gear was widely used in industry. After that, the modified gears, circular arc gears, bevel gears, helical gears and so on were developed.

Modern gear technology has reached: gear modulus 0.004-100 mm; gear diameter from 1 mm to 150 m; transmission power up to 100000 kW; rotational speed up to 100000 rpm; circumferential speed up to 300 m / s.

Internationally, the power transmission gear device is developing along the direction of miniaturization, high speed and standardization. The application of special gear, the development of planetary gear, the development of low vibration and low noise gear are some characteristics of gear design.

Zhongshan Sani Transmission Technology Co., Ltd. was established in 2003, is a research and development, production of gear transmission products production enterprises. Sani transmission develops a comprehensive design platform for most gears, which can realize automatic parameter design, tooth profile drawing and 3D precise modeling of involute planetary gear system, bevel gear, face gear and other mechanisms. To provide customized services for customers in transmission scheme design, part mold design and manufacturing, part production and integrated assembly.


Contact: Jack He

Phone: +86(0)18088846213(微信同號)

Tel: +86-0760-88898029

Email: jackhe_sani@163.com

Add: BuildingA 125 WeiMin Road,DongSheng Town,ZhongShan city,GuangDong Province,China

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