Double-Planet Planetary Gear Layout for Cable Feedthrough Space
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Solution Overview
Problem
Existing planetary gear units face challenges in routing cables and similar components due to complex internal structures, making it difficult to achieve a simple and cost-effective feedthrough.
Innovation Solution
A planetary gear unit design featuring a first and second ring gear, along with at least four double planets, where the number and size of the double planets are adapted to provide a predetermined interior space for cable feedthrough, while also optimizing torsional stiffness and load-bearing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number and size of double planets are increased to provide sufficient interior space for cable feedthrough, then the installation space requirement increases, but the torsional stiffness and load-bearing capability are improved
Solution Approach 1:
The patent applies parameter changes by systematically varying the number of double planets (4, 6, 8, 10, 12) and their size parameters (tooth count, module) to achieve different interior space volumes. The ring gear internal diameter to double planet diameter ratio is optimized to provide sufficient cable feedthrough space while maintaining structural integrity and minimizing overall installation space requirements.
2Strength
If the number of double planets is increased to improve torsional stiffness and load-bearing capability, then the interior space for cable feedthrough is reduced, but the structural performance is enhanced
Solution Approach 1:
The patent resolves this contradiction by changing parameters including the number of double planets, their tooth count, and module size. By optimizing these parameters, the design achieves high load-bearing capability and torsional stiffness while maintaining sufficient interior space. The ring gear internal diameter to double planet diameter ratio is specifically optimized to balance structural performance with cable feedthrough requirements.
3Device complexity
If the external diameter of ring gears is minimized to reduce installation space, then the interior space for cable feedthrough is reduced, but the compactness is improved
Solution Approach 1:
The patent applies parameter changes by optimizing the ring gear internal diameter and the ratio between ring gear diameter and double planet diameter. This allows the design to minimize external diameter for compact installation while maintaining sufficient interior space for cable feedthrough. The optimized parameter combinations enable compact dimensions without sacrificing the required interior volume.
4Stability of the object's composition
If the number of double planets is increased to improve torsional stiffness, then the manufacturing complexity and cost increase, but the structural rigidity is enhanced
Solution Approach 1:
The patent resolves this contradiction by systematically varying parameters including the number of double planets (4, 6, 8, 10, 12), their tooth count, and module size. These parameter changes enable optimization of torsional stiffness while considering manufacturing complexity. The design identifies optimal parameter combinations that achieve required structural rigidity without excessive manufacturing complexity or cost.
Data Source
AI summary
A planetary gear unit includes a first ring gear having toothing and a second ring gear having toothing and at least four double planets each having a first gear wheel having toothing and a second gear wheel having toothing, the first gear wheel and the second gear wheel of each double planet being disposed so as to be rotatable about a common shaft. The toothing of each first gear wheel engages in the toothing of the first ring gear, and the toothing of each second gear wheel engages in the toothing of the second ring gear. A number and a size of the double planets is selected such that a predetermined size of an interior space in a center of the planetary gear unit, a predetermined torsional stiffness of the planetary gear unit and/or a predetermined load-bearing capability of the planetary gear unit is provided.