Design of planetary gearbox

‌The design process of planetary gearbox includes the following key steps‌:

‌Requirement analysis and design goal setting‌: Before designing a planetary gearbox, it is necessary to first clarify the design goals, including transmission ratio, output torque and speed requirements. The transmission ratio determines the ratio of deceleration or acceleration, the output torque is calculated according to the application requirements, and the speed requirements involve the specific speeds of input and output‌.

‌Parameter selection‌:

‌Number of gears and number of teeth‌: Usually 3 to 6 planetary gears are selected, and the number of teeth should be selected to meet the transmission ratio requirements. For example, if the inner ring gear is set to 60 teeth and the sun gear is set to 20 teeth, the transmission ratio is 4‌.
‌Material selection‌: Select appropriate materials according to the design load and working conditions. Commonly used are alloy steel and aluminum alloy, which have good mechanical properties and wear resistance‌.
‌Strength and contact stress calculation‌:

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‌Heat calculation‌: Consider the heat generated by friction and load to ensure that the gearbox operates at normal operating temperature‌.
‌Optimization design‌: Conduct strength verification, efficiency calculation, vibration analysis and optimization design to confirm the feasibility of the design and whether the performance indicators meet the expected requirements‌.