Planetary Gear Assembly With Selective Pin Reinforcement for Torque Adaptation
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Solution Overview
Problem
Existing planetary gear systems face challenges in adapting to varying torque levels without redesigning the entire structure, leading to misalignment, reduced efficiency, and premature failure due to misalignment and oversizing issues, which are not addressed by existing assembly methods like EP2940347A1.
Innovation Solution
A modular assembly method using selectively attachable axial locking means and reinforcing bodies that can be chosen based on the expected torque level, allowing the planetary gear system to adapt structurally to different torque requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If planetary gear systems are sized for high torque values, then they can withstand high stresses, but they lead to reduction in efficiency due to unjustified increase of rotating mass
Solution Approach 1:
The support pins are designed with dynamic reinforcement capabilities through selectively attachable reinforcing bodies that can be added or removed based on actual torque requirements. This allows the system to adapt its structural strength dynamically rather than being statically oversized for maximum torque scenarios.
Solution Approach 2:
The system enables parameter changes in the support pin configuration by selectively attaching reinforcing bodies with different geometries and material properties. This allows optimization of the pin's mechanical parameters (strength, stiffness) to match the specific torque demands of each application.
2Strength
If planetary gear systems are designed for high torque values, then they can withstand high stresses, but they cannot be adapted to lower torque applications without redesigning the entire structure
Solution Approach 1:
The support pin structure is segmented into a base pin and selectively attachable reinforcing bodies. This segmentation allows the reinforcing portions to be independently added or removed based on torque requirements, enabling adaptation to different applications without redesigning the entire pin structure.
Solution Approach 2:
The base support pin design serves as a universal foundation that can accommodate multiple reinforcing body configurations. This universal base structure combined with specialized reinforcing bodies allows the same basic design to serve multiple torque levels and application types.
3Weight of moving object
If support pins are undersized for high torque applications, then rotating mass is reduced, but misalignment occurs causing reduced transmission effectiveness
Solution Approach 1:
Reinforcing bodies are pre-configured and selectively attached to support pins before assembly into the planetary gear system. This preliminary reinforcement ensures that the support pins have adequate stiffness and alignment capability from the outset, preventing misalignment issues before they occur during operation.
Solution Approach 2:
The support pin structure combines the base pin material with reinforcing body materials to create a composite structure with optimized mechanical properties. This composite approach allows achieving the necessary strength and stiffness for high torque applications while maintaining reasonable weight through strategic material placement.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A planetary gear system (1) comprising a cup-shaped body (2) defining an inner base portion (3) and a side portion (4) wherein the cup-shaped body (2) has a plurality of integrated pins (7) arranged on the inner base portion (3) and suitably sized to withstand the stresses generated by a first maximum transmittable torque; a plurality of gear wheels (8) rotatably mounted on the integrated pins (7) to define an operating condition of the planetary gear system (1); and axial locking means (11) mounted on a top portion (7a) of at least one of the integrated pins (7). The planetary gear system (1) comprises at least one reinforcing body (12) rigidly connected to the cup-shaped body (2) and shaped to bind together the top portions (7a) of said integrated pins (7).