Helical bevel gears are widely used in the fields of automobile, aviation and mine, because of their large overlap coefficient, strong bearing capacity, high transmission ratio, smooth drive and small noise. Helical bevel gears are divided into two kinds, one is spiral bevel gear, and its large wheel axis and small wheel axis intersect; one is quasi-hyperbolic helical bevel gear, and its large wheel axis and small wheel axis have certain offset distance. At present, the production of spiral bevel gears world-class companies are mainly in the United States of the U.S. and the Swiss company of the Austrian. The helical bevel gears of Gleason Gear are widely used in our country at present. Because of its meshing principle and its complexity, we have a large number of human and material resources for the research of helical bevel gears in the 70 's.
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