Planetary Gear Carrier Fixing Structure for Accurate Torque Transmission
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Solution Overview
Problem
Existing planetary gear reduction mechanisms face challenges in accurately driving objects due to potential rattling between the output shaft and shaft coupling, which affects the precision of power transmission.
Innovation Solution
A planetary gear reduction mechanism is designed with a support shaft fixing hole and a fixing member to securely attach the planetary carrier, ensuring accurate positioning and fixation of the shaft coupling, thereby preventing rattling and enhancing precision in power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shaft coupling is used to connect the output shaft and the object to be driven, then power transmission is enabled, but rattling occurs between the shaft coupling and output shaft when attachment accuracy is low
Solution Approach 1:
The patent integrates the output shaft directly into the planetary carrier by fixing it to the rotation center, eliminating the separate shaft coupling component. This merging of components removes the interface between shaft coupling and output shaft, thereby eliminating rattling while maintaining power transmission functionality.
2Device complexity
If the output shaft is integrally provided at the rotation center of the carrier, then power transmission is simplified, but attachment accuracy must be high to prevent rattling
Solution Approach 1:
The patent pre-fixes the output shaft to the planetary carrier at the rotation center during assembly, establishing a fixed reference position before final assembly. This preliminary positioning ensures high attachment accuracy without requiring complex post-assembly adjustments or high-precision machining of separate coupling interfaces.
3Strength
If a fixing member is used to fix the output side rotating body to the planetary carrier, then the output side rotating body is securely attached, but the support shaft fixing hole structure is required
Solution Approach 1:
The patent divides the fixing function into two distinct elements: a support shaft fixing hole in the planetary carrier and a separate fixing member. This segmentation allows each component to be optimized independently - the hole provides precise positioning while the fixing member provides secure attachment, achieving strong fixation without overly complicating the overall structure.
Data Source
AI summary
A planetary gear reduction mechanism is capable of accurately driving an object to be driven. A carrier 60 is provided with first and second support shaft fixing holes 64a and 64b to which a support shaft 52 that rotatably supports a planetary gear 50 is fixed, and a shaft coupling 70 is fixed to the carrier 60 by a fixing pin 73 fixed to the second support shaft fixing hole 64b, which allows the shaft coupling 70 to be accurately fixed to the carrier 60 formed with high processing accuracy. Therefore, a planetary gear reduction mechanism 10 is realized, which is capable of accurately driving a drive mechanism of a robot, which is an object to be driven.