Geometry of Cylindrical Self-locking Gears with Circular-arc Tooth Profiles

The article presents the research results of helical self-locking gear synthesis in order to achieve a self-locking effect. Standard gear cutting equipment not always allows getting the necessary helix angle of a tooth for reaching a self-locking effect. Therefore there have been tasked to find the substitute profiles closely approximately those of involutes that do not require any special equipment for its processing. Processed by an abrasive wheel on a gear grinding machine or on a turning lathe by a cutting tool with circular cutting edges, curvature radius of which is equal to the radius of curvature of involutes in axial section, profiles answer to the task. Moreover the profiles in the axial section are outlined by circular arcs, and point of contact in a meshing is realized theoretically accurate. The practical difference between the circular and involute tooth profiles can be reduced to an amount not exceeding the processing tolerance.

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