Provided are a spherical involute straight bevel gear pair and tooth profile modification method thereof; the spherical involute straight bevel gear pair comprises a meshing driving gear (1) and driven gear (2); the tooth profile of the gear is divided into two segments; the AB segment is the theoretical spherical involute and the BD' segment is a spherical modified curve, B being the starting point of the modification. The method for modifying the tooth profile of the gear comprises the following steps: software modeling → manufacturing modification mold → mass production.
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