Multi-step shaft hub seat for stress distribution
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Solution Overview
Problem
Existing shaft-hub connections, particularly polygonal connections, face challenges in optimizing force introduction and distribution, leading to high material stresses and potential corrosion, while also being complex and costly to produce and assemble.
Innovation Solution
Incorporating a multi-step hub seat with radial shoulders, allowing for a more even force distribution across multiple steps, reducing maximum stress and allowing for improved material efficiency and assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a conventional single-step hub seat is used, then the structure is simple, but the force distribution is poor leading to high maximum stress
Solution Approach 1:
The hub seat is divided into multiple steps (at least two) along the longitudinal direction of the shaft, creating multiple radial shoulders. This segmentation distributes the force from the component over multiple contact surfaces instead of concentrating it on a single surface, thereby reducing the maximum stress on the shaft while maintaining a relatively simple overall structure.
2Force
If a conventional single-step hub seat is used, then the manufacturing is simple, but the force introduction into the shaft is not optimized
Solution Approach 1:
The hub seat is segmented into multiple steps with different radial dimensions, creating multiple radial shoulders that contact the component at different positions. This segmentation optimizes force introduction by distributing loads across multiple contact points, improving force distribution without significantly complicating the manufacturing process.
3Duration of action of moving object
If larger component dimensions are used, then the service life is sufficient, but the material consumption increases
Solution Approach 1:
By segmenting the hub seat into multiple steps, the force is distributed over a larger total contact area without increasing the overall component dimensions. This allows achieving sufficient service life through better stress distribution rather than simply increasing size, thereby reducing material consumption while maintaining durability.
4Stress or pressure
If pre-stresses are applied to individual steps, then the force distribution is improved, but the assembly process becomes more complex
Solution Approach 1:
Different radial shoulders are designed with different radial dimensions, allowing pre-stresses to be applied selectively to individual steps. This local differentiation optimizes force distribution across the hub seat by enabling tailored pre-stressing of specific contact surfaces, while the modular step design actually simplifies the assembly process by providing clear positioning references.
Data Source
AI summary
A shaft-hub connection having a hub seat (2), which is provided by the shaft (1), and a hub of a component (5), which is received by the hub seat (2), wherein the hub seat (2) and the hub of the component (5) implement a polygonal connection. In order to provide a shaft-hub connection which is optimized in particular in regard to the force introduction into the shaft, it is proposed by the invention that the hub seat (2) has at least one radial projection (9, 10) in the longitudinal direction (11) of the shaft (1).