Abstract
Gear systems are extensively employed in mechanical systems since they allow the transfer of power with a variety of gear ratios. So gears cause the inherent deflections and deformations due to the high pressure which occurs between the meshing teeth when transmit power and results in the transmission error. It is usually assumed that the transmission error and variation of the gear mesh stiffness are the dominant excitation mechanisms. Predicting the static transmission error is a necessary condition to reduce noise radiated from the gear systems. This paper aims to investigate the effect of tooth profile modifications on the transmission error of helical gear. The contact stress analysis was implemented for different roll positions to find out the most critical roll angle in view point of root flank stress. The PPTE (peak-to-peak of transmission error) is estimated at the roll angles by different loading conditions with two dimensional FEM. The optimal profile modification from the root to the tip is proposed.
Highlights
Gear system is being widely used for the rotational speed reduction and acceleration as well as converting the operational direction
2.2 Finite Element Analysis conditions Finite element analysis conditions for model that its profile was modified is that rotational speed of driving gear was applied as shown in Fig.2 and each loading torque, 450Nm, 1000Nm, and 150Nm, was applied to driven gear
3.1 Transmission error reduction along the tooth profile modification Contact patterns varies along the contact ratio (CR) as gear pair is rotating
Summary
Gear system is being widely used for the rotational speed reduction and acceleration as well as converting the operational direction. Tooth deflection and bending stress in root are generated when a pair of gear is meshing. It causes radiated noise from the gear case by transmission error which excites driving shafts and bearings mounted on them. Sivakumar [8] researched load transmission in high contact ratio gear system and Sawalhi Nader [9] studied about simulation method in rotation bearing fault phenomenon by rotation shaft vibration. Endo Hiroaki and Sawalhi Nader [9] studied about bearing vibration measurement simulation model at rotating gears. Method on reduction of general helical gear was researched by finite element analysis. Gear contact characteristics such as transmission error and bending stress was compared and analyzed. The test bench was set in order to measure transmission error, and frequency characteristics of transmission error was compared and analyzed in different three loading conditions
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