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History. Follow us read together.

BC three hundred years, the application of the gears in the transmission. The ancient Greek philosopher Aristotle in the mechanical problems, it expounds the bronze or iron gear

Pass rotating movement of the problem. Invented in ancient China, has been applied in the whole of the gear train. However, the ancient gear is made of wood or with gold of moulds, the only

Pass between shaft rotary motion, cannot guarantee that transmission smoothness, the bearing capacity of the gear are also small.

With the development of production, the gear operation stability. 1674 Danish astronomer roemer first with outer cycloid tooth profile curve is put forward, in order to get smooth operation

The gear.

In the 18th century industrial revolution, gear technology got rapid development, people have made a lot of research on gear. In 1733 the French mathematician card meters published tooth profile meshing base

This law; In 1765 the Swiss mathematician euler proposed using involute tooth profile curve.

Emerged in the 19th century gear hobbing machine and gear shaper, solves the problem of mass production and high precision gear. In 1900, ford for gear hobbing machine is installed on the differential device, can in gear hobbing machine

Processing helical gear, gear hobbing machine from roll grinding wheel gained popularity, generating method processing gear of the landslide, gear involute gear become the most widely used.

In 1899, pull up the first implementation of the project of the modified gear. Modified gear can not only avoid wheel tooth root cutting, can also gather together with center distance and improve the bearing capacity of the gear.

In 1923 America's Wilder Hubble first put forward the circular arc tooth profile of gear, 1955 Sue his to the in-depth research of circular arc gear, arc gear to application

In the production. The gear bearing capacity and efficiency is higher, but it is not as good as involute gear that is easy to manufacture, it remains to be further improved.