Sleeve Yoke Fixing Surface Segmentation for Short Cardan Shafts
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Solution Overview
Problem
Existing methods for fixing sleeve yokes to broaching benches for cutting spline profiles in cardan shafts are inadequate for extremely short shafts, as they require a circular fixing surface that interferes with the protective cover seal, leading to reduced axis distance, excessive chip removal, and decreased strength due to machining on the external diameter.
Innovation Solution
Creating fixing surfaces on the heights of the ear lugs of the sleeve yoke, allowing for a non-circular arc angle of 360° to 150°, which reduces chip removal and positions the fixing surface away from the protective cover seal, enabling shorter cardan shafts with increased strength and stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a circular fixing surface is created on the external diameter of the body, then the fixing surface provides adequate contact area, but excessive chip removal is required and the axis distance cannot remain under a certain value
Solution Approach 1:
The invention divides the fixing surface into two separate locations: one on the external diameter of the body and another on the internal diameter of the body. This segmentation allows each fixing surface to be smaller and positioned optimally, reducing the total chip removal required while maintaining adequate contact area for fixing the sleeve yoke to the broaching bench
Solution Approach 2:
The invention transitions from a single circular fixing surface on the external diameter to a dual-location fixing system that utilizes both external and internal diameters. This dimensional change in the fixing surface configuration reduces the sliding length requirement and allows for shorter cardan shafts while minimizing chip removal
2Area of stationary object
If a circular fixing surface is created on the external diameter of the body, then the fixing surface provides adequate contact area, but the machining time increases due to larger diameter body
Solution Approach 1:
By segmenting the fixing surface into two locations (external and internal diameters), the required contact area at each location is reduced, allowing for smaller diameter bodies to be used. This segmentation enables faster machining times while still providing adequate fixing surface area for the broaching operation
Solution Approach 2:
The invention changes the geometric parameters of the fixing surface configuration, transitioning from a single large circular surface to two smaller surfaces at different locations. This parameter change allows for reduced body diameter and consequently shorter machining times while maintaining the necessary fixing surface area
3Area of stationary object
If the fixing surface is created on the external diameter of the body, then the fixing surface provides adequate contact area, but the strength of the cardan shaft is reduced in the fixing area
Solution Approach 1:
The invention segments the fixing surface requirement into two locations, allowing the external diameter fixing surface to be smaller and not compromise the overall strength of the cardan shaft. The internal diameter fixing surface provides additional support, distributing the stress and maintaining strength in the fixing area
Solution Approach 2:
The invention creates a recess or cavity in the internal diameter of the body beforehand, which serves as a pre-prepared fixing surface location. This preliminary action allows for the fixing surface to be created without compromising the strength of the external diameter, as the internal fixing surface is prepared in advance
Data Source
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AI summary
The invention relates to the leaning surfaces wherein the sleeve yoke (11) is attached to the broach bench for the process of cutting spline threads (12) in the inner section of the sleeve yoke (11); and is characterised in that; it comprises heights (14) formed on the lobe (13) of the said sleeve yoke (11) and the leaning surfaces (15) formed on these heights (14).