Planetary Carrier Spherical Recess Transition
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Solution Overview
Problem
Existing planetary carriers are not optimized in terms of weight and strength, particularly in the transition regions between planet web cheeks and planet webs, limiting their efficiency in applications such as wind turbine transmissions.
Innovation Solution
The transition between planet web cheeks and planet webs features a rounded contour, with a concave or spherical recess design that enhances strength and allows for reduced wall thickness, along with triangular geometries and projections for further optimization, enabling a balance between weight reduction and increased strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a straight chamfer is used in the transition region, then the manufacturing is simpler, but the strength is reduced and wall thickness must be maintained
Solution Approach 1:
The transition region between the planet web cheek and the planet web is designed with a rounded contour instead of a straight chamfer. This curved geometry better adapts to the lines of flux in the planetary carrier, significantly optimizing the strength in the transition region while allowing for reduced wall thickness
2Weight of moving object
If the wall thickness is reduced to optimize weight, then the weight decreases, but the strength in transition regions is compromised
Solution Approach 1:
The planetary carrier features locally optimized geometry in the transition regions between planet web cheeks and planet webs. The rounded contours and concave spherical recesses are specifically positioned where stress concentrations occur, allowing wall thickness reduction in non-critical areas while maintaining strength in critical transition zones
Solution Approach 2:
Rounded contours and concave spherical recesses in the transition regions eliminate stress concentration points that would otherwise require thicker walls. This curved geometry distributes stresses more evenly, enabling weight reduction while maintaining structural integrity
3Strength
If a closed triangular geometry is used for planet webs, then the strength is optimized, but the weight increases compared to open geometry
Solution Approach 1:
The planet webs are designed with an open triangular geometry that segments the structure into efficient load-bearing elements. This open geometry provides sufficient strength for the application while removing unnecessary material, achieving an optimal balance between strength and weight compared to a closed triangular configuration
Data Source
AI summary
A planetary carrier of a planetary gearing includes two planet web cheeks interconnected by planet webs. The sides of the planet web cheeks are mutually opposed in the circumferential direction and, together with outer lateral surfaces of the planetary webs, define lateral surface openings. At least one planet pin opening for receiving a pin for mounting a planet gear is provided in at least one planet web cheek. At least one planet web cheek, in the region of the attachment of a planet web, has a transition reducing the axial length of the planet web. The planetary carrier is optimized in terms of weight and strength by way of the transition having a rounded contour in the form of a spherical recess.