Evaluation of Low-Noise, Improved-Bearing-Contact Spiral Bevel Gears

摘要

Studies to evaluate low-noise, improved-bearing- contact spiral-bevel gears were performed. Experimental tests were performed on the OH-58D helicopter main-rotor transmission in the NASA Glenn 500-hp Helicopter Transmission Test Stand Low-noise, improved-bearing- contact spiral-bevel gears were compared to the baseline OH-58D spiral-bevel gear design, a high-strength design, and previously tested low-noise designs. Noise, vibration, and tooth strain tests were performed. The low-noise, improved-bearing- contact spiral-bevel design showed a decrease in noise compared to the baseline OH-58D design, but not as much reduction as previous tested low-noise designs. The low-noise, improved- bearing-contact spiral-bevel design gave the same benefit in reduced vibration compared to the baseline OH-58D design as that of the previously tested low- noise designs. The pinion tooth stresses for the low-noise, improved-bearing- contact spiral-bevel design showed a decrease compared to the baseline OH-58D design, but not quite as much as the previous tested high-strength and low-noise designs For the low-noise. improved-bearing- contact design. the maximum stresses shifted toward the heel, compared to the center of the face width for the baseline, high-strength, and previously tested low-noise designs. Lastly, no hardline condition was found on the pinion tooth flank for the low-noise, improved- bearing-contact design.