Wheel Hub Unit Central Nut Radial Profile Anti-unscrewing
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Solution Overview
Problem
Existing wheel hub units with central nuts are heavy and inefficient in reducing radial footprint, which limits their potential for weight reduction and material savings, especially in sports tires where lighter weight and reduced kinetic energy are beneficial.
Innovation Solution
A wheel hub unit design featuring a central hub with an internal shaped profile and an external threaded profile, combined with a single central nut having internal and external shaped profiles, and an anti-unscrewing element with radially oriented profiles, allowing for optimized alignment and reduced weight by varying the number of teeth on these profiles for secure angular integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the central hub and single nut have shaped profiles that axially overlap, then angular integration and anti-unscrewing are achieved, but radial footprint and weight increase
Solution Approach 1:
The invention transitions from axial overlap of shaped profiles to radial alignment. The shaped profile on the central hub and the shaped profile on the single nut are arranged radially aligned rather than axially overlapping, thereby achieving angular integration while minimizing radial footprint and weight.
Solution Approach 2:
The anti-unscrewing element is designed as a separate component with its own shaped profile that radially aligns with the profiles on the hub and nut. This segmentation allows independent optimization of each component's dimensions, reducing overall weight while maintaining functional integrity.
2Reliability
If shaped profiles are made axially overlapping to prevent nut rotation, then angular integration is achieved, but radial footprint increases
Solution Approach 1:
The invention changes the spatial arrangement of shaped profiles from axial overlap to radial alignment. The shaped profile on the central hub and the shaped profile on the single nut are positioned radially aligned, which achieves angular integration while minimizing the radial footprint of the wheel hub unit.
Solution Approach 2:
The shaped profiles are designed with asymmetric tooth configurations where the number of teeth on the hub profile differs from the number of teeth on the nut profile. This asymmetric design enables precise angular positioning and integration while maintaining a compact radial footprint.
Data Source
AI summary
A wheel hub unit having a central hub and a single central nut that includes respective shaped profiles radially oriented facing towards an axis (A) is provided. The wheel hub unit further includes an anti-unscrewing element interposed between the central hub and the single central nut to prevent accidental unscrewing of the single central nut. The anti-unscrewing element is provided with respective shaped profiles both radially oriented facing away from the axis (A) to engage with shaped profiles.