Comparison of bevel gears with different pressure angle and sound analysis

Objective: The aim of the study is to select the most efficient gear after designing and comparing spur bevel gears with 3 different pressure angles. After the most efficient gear is selected, it is necessary to make the necessary macro modifications and sound analysis to improve this gear. Materials and Methods: The gears of the gearbox of the fertilizer spreader with a 1:1 ratio of 15 teeth were designed in KISSsoft. The designed gears with 14.5°, 20° and 25° pressure angles were analyzed in ANSYS Workbench and their sound analysis was performed. Macro modifications were made in Solidworks program and static analyzes were made in ANSYS Workbench and compared. Sound analysis was performed with decibel meter and test machinery. Results: According to KISSsoft analysis, gear pair with 25° pressure angle is the most efficient gear in terms of mesh efficiency gear power loss. Input values of 540 RPM and 7.5 kW were applied during the gear design phase. The gear macro geometry and module remained constant despite different pressure angles. The best macro modification is radius applied to the tooth circle. Conclusion: The change in pressure angle does not affect macro geometry values such as cone distance, outer coefficient, average coefficient, gear diameters. It affects gear mesh efficiency, gear power loss, and specific sliding values. For the gear pair with 15 teeth, the most efficient gear system is the gear pair with a pressure angle of 25°. ANSYS analysis also supports this result. According to the sound analysis, the quietest system is the gear pair with the radius macro modification. Key Words: Bevel gear, Macro Modification, Macrogeometry of gear, Pressure Angle, Specific Sliding