Face Spline Wheel Bearing Rigidity Optimization
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Solution Overview
Problem
Existing wheel bearing arrangements have low bearing rigidity, leading to tilting under loadings, which adversely affects vehicle driving behavior and brake wear, especially during turns, due to their high weight and limited moment transmission capabilities.
Innovation Solution
The wheel bearing arrangement is enhanced by optimizing the face spline geometry, with a pitch circle diameter to tooth number ratio of 0.7 to 1.4 and a pitch circle diameter of the rolling bodies limited to 1.7 times the toothing pitch circle diameter, along with specific dimensions for tooth width and collar design to increase rigidity and support higher drive moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the wheel bearing arrangement uses conventional face spline design, then the structure is simple and manufacturing is easy, but the bearing rigidity is low and tilting under load occurs
Solution Approach 1:
The patent applies parameter changes by optimizing the face spline geometry with specific ratios: the pitch circle diameter to tooth number ratio is set to at least 0.7, and the pitch circle diameter of rolling bodies is limited to at most 1.7 times the toothing pitch circle diameter. These parameter optimizations increase the number of teeth and load-bearing capacity, thereby improving bearing rigidity and reducing tilting under load without requiring fundamentally new structural concepts.
2Power
If the wheel bearing arrangement transmits higher moments, then the drive capability is improved, but the bearing tilts more under load due to lower rigidity
Solution Approach 1:
The patent applies local quality by optimizing specific local geometric features of the face spline rather than changing the overall structure. By adjusting the pitch circle diameter and tooth number ratio locally, the design increases the number of teeth in the face spline, which enhances both the moment transmission capability and the bearing rigidity simultaneously, preventing excessive tilting under load.
3Stability of the object's composition
If the wheel bearing arrangement has higher bearing rigidity, then tilting under load is reduced, but the weight of the unit increases
Solution Approach 1:
The patent achieves higher bearing rigidity through parameter optimization of the existing face spline geometry rather than adding more material or increasing overall dimensions. By setting the pitch circle diameter to tooth number ratio to at least 0.7 and limiting the rolling body pitch circle diameter to at most 1.7 times the toothing pitch circle diameter, the design increases tooth count and load distribution efficiency, improving rigidity while maintaining comparable weight to conventional designs.
Data Source
AI summary
A wheel bearing arrangement which as at least two rows of rolling bodies which are used to bear a wheel hub which can be driven by a drive element and which includes a wheel bearing arrangement. The wheel hub is connected to the drive element. The wheel hub and the drive element engage together in a positive fit via a pair of face splines which correspond to each other.