Wheel Hub Rotary Joint Torque Transmission
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Solution Overview
Problem
Existing wheel hub swivel joint arrangements face challenges in designing components that are both sufficiently solid and stiff to withstand high torques while also allowing for the desired elastic deformation to achieve a bearing of spur gearing over the entire surface, typically resulting in only 'external carriers' with radially outer support.
Innovation Solution
The design involves spur gears that initially contact radially inward and then expand to radially outward as clamping force increases, with one end face being convex and the other flat, allowing for a larger contact area and differential deformability between radially inner and outer areas to achieve a more uniform torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If components are designed to be solid and stiff to withstand high torques, then torque transmission capability is improved, but elastic deformation capability deteriorates
Solution Approach 1:
The invention applies different material properties to different regions of the same component. The radially outer area of the toothing is designed with higher strength and stiffness to withstand torque, while the radially inner area is designed with lower strength and higher deformability to enable elastic deformation during assembly. This local differentiation resolves the contradiction by allowing each region to fulfill its specific function.
Solution Approach 2:
The toothing is segmented into functionally distinct regions: a radially outer area for torque transmission and a radially inner area for deformation. This segmentation allows the component to simultaneously exhibit both stiffness (in the outer area) and flexibility (in the inner area), resolving the contradiction between strength and adaptability.
2Ease of operation
If end face is designed as dish-shaped with concave curvature, then assembly alignment is improved, but contact area distribution deteriorates
Solution Approach 1:
Instead of using a concave (dish-shaped) end face as in prior art, the invention inverts the curvature to be convex. This inversion changes the deformation behavior during assembly: the convex shape, combined with the differential material properties, ensures that the radially inner area deforms first and the contact area expands uniformly from inner to outer regions, achieving both alignment and optimal contact distribution.
3Adaptability or versatility
If radial outer area is made more deformable, then elastic deformation is improved, but torque transmission capability deteriorates
Solution Approach 1:
The invention reverses the conventional approach by making the radially inner area more deformable and the radially outer area stiffer. This local quality differentiation ensures that deformation occurs where it is needed (in the inner area during assembly) while torque transmission occurs where strength is needed (in the outer area during operation).
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a contact area of at least 70% of the tooth surfaces when fully assembled, providing enhanced torsional rigidity and reduced installation space requirements, while minimizing the risk of misalignment during assembly.
Implementation Method 1
only then as a result of elastic deformation on the end face of the outer joint body due to the prestressing of a bolt... come to rest on top of each other
Data Source
Figure 1~2
AI summary
The invention relates to a wheel hub rotary joint arrangement with an axis of rotation (A), comprising a wheel hub with a wheel flange for connecting a wheel and a sleeve section for receiving a wheel bearing, a constant-velocity rotary joint with an outer joint part (1), an inner joint part and torque-transmitting elements. The outer joint part (1) has a first spur gearing section (2) with first teeth (2a) at the end facing the wheel hub, and the sleeve section has a second spur gearing section with second teeth at the end facing the constant-velocity rotary joint, the two spur gearing sections engaging with one another for torque transmission. Said wheel hub joint arrangement further comprises tensioning means for axially tensioning the wheel hub against the outer joint part, said tensioning means being axially supported on one side on the wheel hub and on the other side on the outer joint part. At least one of the two spur gearing sections is designed such that, viewed in the radial direction, the first and second teeth (2a) initially only contact with one another on a small subsurface of the tooth surfaces facing one another during axial tensioning of the arrangement, and this subsurface increases in size during further tensioning. The spur gearing sections (2) are designed such that, viewed in the radial direction, the first and second teeth (2a) initially contact with one another on the radially inward side during axial tensioning of the arrangement and as tensioning increases also contact with one another on the radially outward side, for which purpose a substructure (1a) of the sleeve section having the teeth (2a) and/or of the outer joint part is designed to be more easily deformable in a radially inward region (Rj) than in a region (Ra) lying further outward radially.