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<p>The use of internal gears is prevalent in gear transmission, and their important applications in the power transmission industry include planetary gear systems for automatic transmission, robotic arms, turbine generators, tractors, construction equipment, textiles, material handling, and packaging. An effective design of internal spur gears is necessary to enhance the tooth strength, wear resistance, efficiency, and reliability in high-performance gear applications. Hence, the development of high-performance internal gears is an important research area in the field of gear engineering. In this study, high-contact-ratio (HCR) internal gears with an asymmetric tooth profile are developed. Using a&#xa0;finite element-based stress analysis, the performance of two different sets of HCR internal asymmetric gears, namely (i)&#xa0;α<sub>od</sub> &lt; 20 and h<sub>a</sub> = 1 m, (ii)&#xa0;α<sub>od</sub> &gt; 20° and h<sub>a</sub> &gt; 1 m with α<sub>oc</sub> = 20°, are investigated and presented in this work. The results show that the contact ratio is greater than two (in HCR) as the drive side pressure angle (α<sub>od</sub>) decreases below 18.5°, and it is less than two (in LCR) as α<sub>od</sub> increases beyond 18.5°. It is concluded that for designing an HCR internal asymmetric gear with a&#xa0;greater bending strength, the value of α<sub>od</sub> should be less than the value of α<sub>oc</sub> (for example, α<sub>od</sub> = 16° &lt; α<sub>oc</sub> = 20°). However, to achieve greater contact strength, wear resistance, and efficiency, a&#xa0;larger value of α<sub>od</sub> should be considered on the loaded side than on the unloaded side (for example, α<sub>od</sub> = 25° &gt; α<sub>oc</sub> = 20° and h<sub>a</sub> = 1.3 m) in an HCR internal asymmetric gear.</p>

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An investigation of the tooth strengths and surface wear in a high contact ratio internal asymmetric spur gear set

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • R. Prabhu Sekar

摘要

The use of internal gears is prevalent in gear transmission, and their important applications in the power transmission industry include planetary gear systems for automatic transmission, robotic arms, turbine generators, tractors, construction equipment, textiles, material handling, and packaging. An effective design of internal spur gears is necessary to enhance the tooth strength, wear resistance, efficiency, and reliability in high-performance gear applications. Hence, the development of high-performance internal gears is an important research area in the field of gear engineering. In this study, high-contact-ratio (HCR) internal gears with an asymmetric tooth profile are developed. Using a finite element-based stress analysis, the performance of two different sets of HCR internal asymmetric gears, namely (i) αod < 20 and ha = 1 m, (ii) αod > 20° and ha > 1 m with αoc = 20°, are investigated and presented in this work. The results show that the contact ratio is greater than two (in HCR) as the drive side pressure angle (αod) decreases below 18.5°, and it is less than two (in LCR) as αod increases beyond 18.5°. It is concluded that for designing an HCR internal asymmetric gear with a greater bending strength, the value of αod should be less than the value of αoc (for example, αod = 16° < αoc = 20°). However, to achieve greater contact strength, wear resistance, and efficiency, a larger value of αod should be considered on the loaded side than on the unloaded side (for example, αod = 25° > αoc = 20° and ha = 1.3 m) in an HCR internal asymmetric gear.