Formation of Tooth Profiles of Non-Involute Bevel Gears at CNC Machines

Abstract

The paper considers the cylindrical-bevel internal gear consisting of an involute cylindrical gearwheel with internal teeth, and bevel (in the form of the workpiece) non-involute pinion, the axis of which is inclined to the axis of the gearwheel. Using these links the eccentric planetary gears with two inclined satellites can be created that implement large gear ratios and have high load capacity with a relatively simple design. In their characteristics they are comparable with harmonic gears but are more reliable. However, non-involute pinion teeth have a complex barrel shape, thus complicating the production of their theoretically accurate surface. The cutting teeth of the pinion in question can be exercised in machining the gear blank and gear cutting hob as it moves along a certain curved path. The dependences for determining the trajectory of the milling cutter when cutting the pinion teeth are studied. The movement of the cutter along a curved path can be realized at gear hobbing CNC machines. The research results were used in the design and manufacture of planetary gearboxes for various purposes.