Abstract
Micro-pitting is a common fatigue failure mode of spur gears. To reduce it, this paper proposes a novel tooth tip relief method. Gear meshing simulation is firstly performed considering the actual contact path, showing that there are four Hertz contact stress peaks in the transition areas of the tooth flank. Equations are then developed for the novel tooth tip relief method: one focuses on the smooth transition between the involute profile and the tip relief region, the other on the smooth transition between the tip relief region and the tooth tip. The results of curvature radius and Hertz contact stress show that the proposed novel method can effectively reduce the Hertz contact stress peaks, which indicates this tip relief method could benefit for reducing the micro-pitting. Finally, both wear simulations and bench tests are conducted, verifying the effectiveness of the proposed method for reducing the micro-pitting of spur gears.
Highlights
Spur gears are widely used in heavy-load machinery, such as vehicles, railway equipment, ships, and wind turbines
The main contributions of this paper are: (1) Considering the actual contact path, the gear meshing process is simulated for curvature radius, contact path, and Hertz contact stress; (2) A new method including an arctangentproportional tip relief and a progressive fillet is modeled mathematically, and key parameters are recommended; (3) The tooth profile deviation is calculated based on a wear rate model, and bench tests are carried out to verify the effectiveness of the proposed tooth tip relief method compared with that of the linear tip relief
The Hertz contact stress peaks at transition areas B and D are reduced by 6.7% and 9.1% for c = 50, respectively, compared with those obtained by linear tip relief
Summary
Spur gears are widely used in heavy-load machinery, such as vehicles, railway equipment, ships, and wind turbines. Widely used in engineering applications, is an effective and economical method for reducing micro-pitting, but it leads to an increase in the local Hertz contact stress at the transition area between the involute profile and the tip relief region. The main contributions of this paper are: (1) Considering the actual contact path, the gear meshing process is simulated for curvature radius, contact path, and Hertz contact stress; (2) A new method including an arctangentproportional tip relief and a progressive fillet is modeled mathematically, and key parameters are recommended; (3) The tooth profile deviation is calculated based on a wear rate model, and bench tests are carried out to verify the effectiveness of the proposed tooth tip relief method compared with that of the linear tip relief. The meshing tooth of the gear pair and the path of contact can be confirmed based on the flank radius rP1 of contact point P on the pinion.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
