The theoretical and experimental investigations on involute-helix gear drive are carried out in this paper. Based on the generation principle and mathematical models, parametric design for tooth profiles is provided and three-dimensional solid models are established for simulation of motion. The general characteristics of involute-helix gears are discussed including undercutting condition, the separability of central distance, sliding and meshing characteristics. The meshing essence of tooth surfaces is revealed. Transmission efficiency experiment is made based on the developed gear prototype and the influence factors for the obtained results are also shown.
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