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How To Ensure The Safety of Planetary Gear Transmission? A Detailed Explanation of Planetary Gear Transmission Strength Design
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Whether the design of planetary gear transmission is safe mainly depends on two most important safety factors: tooth surface contact fatigue strength and tooth root bending fatigue strength. As the most important design points of planetary gear transmission, mastering their related knowledge is crucial for engineering practitioners.
2.1 Brief Introduction to Planetary Gear Transmission
The contact fatigue limit and bending fatigue limit of test gears are selected according to the relevant block diagrams in Chapter 1
Allowable Contact Stress
σHP
1350 N/mm²
≈0.90σHlim
Bending Fatigue Limit
σFlim = 500 N/mm²
For NGV-type transmission, regardless of bidirectional operation or not, the tooth root of the planetary gear is subject to alternating loads, so the bending strength should be considered under symmetric cycle. For unidirectional transmission, the selected σFlim value should be multiplied by 0.7; for bidirectional transmission, it should be multiplied by 0.7-0.9 (selected according to MQ-level quality requirements in Figures 14-1-24 and 14-1-53)
