Shaft-Hub Tooth Connection for Easy Assembly and Accurate Centering
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Solution Overview
Problem
Shaft-hub connections that rely on internal and external toothing arrangements face challenges in achieving accurate centering while maintaining ease of assembly, as existing designs often require high joining forces and can be difficult to assemble.
Innovation Solution
The external toothing arrangement is divided into two sections with different tip diameters, allowing for pre-assembly with low axial forces and subsequent centering with higher forces, using an involute design and a nut for easy assembly and alignment, ensuring concentricity and preventing tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an interference fit is created between shaft and hub using toothing arrangements, then accurate centering and positioning is achieved, but assembly becomes difficult and requires high joining forces
Solution Approach 1:
The connecting region of the shaft is divided into two sections with different tip diameters: a first section with a smaller tip diameter for pre-assembly with clearance fit, and a second section with a larger tip diameter for final centering with interference fit. This segmentation allows the assembly process to occur in two stages, first using low forces for pre-positioning, then applying higher forces only to the second section for accurate centering.
Solution Approach 2:
The first section of the connecting region is designed to enable pre-assembly of the shaft and hub with low axial forces, establishing a preliminary positioned state. This preliminary action allows the components to be roughly aligned before the final interference fit is applied to the second section, making the overall assembly process easier.
2Manufacturing precision
If high joining forces are applied to achieve interference fit, then accurate positioning and centering is achieved, but the assembly process becomes more difficult and time-consuming
Solution Approach 1:
The connecting region is segmented into two sections with different tip diameters, allowing the assembly process to be divided into two stages: pre-assembly with low forces and final assembly with high forces. This reduces the total time required compared to applying high forces throughout the entire assembly process.
Solution Approach 2:
The first section enables preliminary assembly that positions the shaft and hub roughly correctly before the final interference fit is applied. This preliminary positioning reduces the time needed for alignment and adjustment during the final assembly stage.
3Manufacturing precision
If the toothing arrangements are designed for interference fit, then concentricity deviations are reduced, but the assembly requires higher forces and becomes more complex
Solution Approach 1:
The connecting region is divided into two sections: the first section with smaller tip diameter provides a clearance fit for simple pre-assembly, while the second section with larger tip diameter provides interference fit for accurate centering. This segmentation reduces assembly complexity by allowing a two-stage process rather than requiring high forces throughout.
Solution Approach 2:
Different sections of the connecting region have different local properties: the first section has a clearance fit design for easy pre-assembly, while the second section has an interference fit design for precise centering. This local differentiation optimizes both ease of assembly and concentricity achievement.
Data Source
AI summary
A shaft-hub connection includes a shaft, which is provided with an external toothing arrangement in a connecting region. The shaft-hub connection also includes a hub, which is provided with an internal toothing arrangement in a connecting region. The external toothing arrangement has a first tip diameter (K1) on the side facing the axial end of the shaft and a second, larger tip diameter (K2) on the side of the connecting region facing away from the axial end so that together with the internal toothing arrangement of the hub a clearance fit is created in the region of the first tip diameter (K1) and an interference fit is created in the region of the second tip diameter (K2).