Segmented Shaft Geometry for Jam-Free Receiver Insertion
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Solution Overview
Problem
The challenge of inserting a shaft into a shaft receiver often results in a 'sticky drawer effect' due to similar cross-sectional areas, leading to prolonged assembly times and potential material deformations when cooling or heating is used to facilitate insertion.
Innovation Solution
A shaft design featuring a nominal, intermediate, and guide shaft portion with specific radial dimensions and contours allows for efficient insertion and alignment, reducing the likelihood of jamming by enabling pivoting and smooth movement into the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cross-sectional area of the shaft is made similar to the cross-sectional area of the opening of the shaft receiver to obtain a tight fit, then the fit quality is improved, but the assembly process becomes difficult due to the sticky drawer effect
Solution Approach 1:
The shaft is divided into three distinct portions along its axial extension: a nominal shaft portion with a first cross-sectional area for tight fit, an intermediate shaft portion with a second cross-sectional area smaller than the nominal, and a guide shaft portion with a third cross-sectional area. This segmentation allows each portion to serve its specific function - the nominal portion provides the tight fit, while the intermediate and guide portions facilitate easy insertion by reducing friction during assembly.
Solution Approach 2:
Different portions of the shaft are given different cross-sectional areas tailored to their specific functions. The nominal shaft portion has a larger cross-sectional area optimized for fit quality, while the intermediate and guide shaft portions have progressively smaller cross-sectional areas optimized for insertion ease. This local differentiation of geometric properties resolves the contradiction between tight fit and easy assembly.
2Ease of operation
If cooling or heating is applied to the shaft or shaft receiver to temporarily increase the difference in cross sectional areas, then the insertion process becomes smoother, but additional equipment is required and permanent deformations or changes in material properties may occur
Solution Approach 1:
Instead of applying thermal treatment during assembly, the shaft is pre-designed with varying cross-sectional areas in different portions. The intermediate and guide shaft portions are manufactured with smaller cross-sectional areas than the nominal portion, creating the necessary dimensional difference before assembly begins. This preliminary geometric design eliminates the need for thermal equipment while achieving smooth insertion.
Solution Approach 2:
The invention replaces the thermal field approach (cooling/heating equipment) with a purely mechanical geometric design. By carefully designing the cross-sectional areas of different shaft portions, the insertion smoothness is achieved through mechanical geometry rather than thermal processing, thereby eliminating the need for additional thermal equipment and avoiding material property changes.
3Ease of operation
If cooling or heating is applied to facilitate insertion, then the assembly process is eased, but the material properties of the shaft or shaft receiver may be permanently altered
Solution Approach 1:
The necessary dimensional differences are built into the shaft's geometry during manufacturing, with the intermediate and guide shaft portions having smaller cross-sectional areas than the nominal portion. This preliminary geometric configuration enables easy assembly without requiring subsequent thermal treatment that could alter material properties, thereby maintaining material stability while achieving assembly ease.
Solution Approach 2:
The invention substitutes thermal processing with a mechanically designed geometric progression of cross-sectional areas. The intermediate and guide shaft portions are designed with progressively smaller cross-sectional areas to facilitate insertion, eliminating the need for cooling or heating operations that could cause permanent material property changes, thus preserving material reliability.
Data Source
AI summary
The present disclosure relates to a shaft adapted to be at least partially inserted into an opening of a shaft receiver. The shaft comprises a nominal shaft portion adapted to be at least partially inserted into the opening of the shaft receiver, followed by an intermediate shaft portion that in turn is followed by a guide shaft portion terminating the shaft. The shaft comprises a cross-section with a cross-sectional contour in a plane including the central axis, the cross-sectional contour comprising a nominal shaft portion contour of the nominal shaft portion, an intermediate shaft portion contour of the intermediate shaft portion and a guide shaft portion contour of the guide shaft portion. The cross-sectional contour comprises a radial direction being perpendicular to the central axis, wherein, as seen in the radial direction, the nominal shaft portion contour is located at a nominal radial distance from the central axis.