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How to Ensure the Safety of Planetary Gear Transmission? A Detailed Explanation of Planetary Gear Transmission Strength Design
Friends interested in gear transmission can scan the QR code to join the Knowledge Planet "Gear Transmission Knowledge Platform", where massive materials are shared, and questions can be asked and answered through platform communication. Let's work together to build a gear transmission knowledge planet.
Planetary gear transmission, with its advantages of compact structure, high power density, and stable transmission, is widely used in wind power, aviation, construction machinery, robots, automobiles and other fields.
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.
This article only checks the basic principles and design points of planetary transmission. For specific and detailed learning materials, scan the QR code of the Knowledge Planet community at the top of the article and download them after entering.
2.1 Brief Introduction to Planetary Gear Transmission
For basic principles of planetary gear transmission, please refer to the official account article: Gear Transmission: Planetary Transmission - A Detailed Explanation of Planetary Gear Transmission. It will not be repeated here.
2.2 Material Selection for Planetary Gear Transmission
| Gear Material Selection | ||||||
|---|---|---|---|---|---|---|
| 1 | Sun Gear A | |||||
| Material | 20CrMnMo | |||||
| Surface Treatment | Carburizing and Quenching | |||||
| Hardness | 58 HRC | Tooth surface hardness: HRC 56-60; Core hardness: HRC 30-42 | ||||
| Contact Fatigue Limit | σHlim | 1500 N/mm² | 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) | ||||
| 2 | Planetary Gear C | |||||
| Material | 20CrMnMo | |||||
| Surface Treatment | Carburizing and Quenching | |||||
| Hardness |
Pub Time : 2025-08-04 09:50:56
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