Wheel Hub Inner Ring Contact Structure for Axial Locking
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Solution Overview
Problem
Existing wheel hub assemblies face challenges in achieving effective axial locking of the radially inner ring due to a smaller contact area on the axially outer side compared to the axially inner side, leading to inefficient contact pressure distribution and potential grinding burns during manufacturing.
Innovation Solution
The design introduces two contact surfaces on the axially inner side of the radially inner ring, separated by a relief groove, to increase the contact area with the constant-velocity joint, thereby reducing the contact pressure concentration and avoiding grinding burns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axially inner contact area of the inner ring is increased to improve locking performance, then the contact pressure distribution improves, but the manufacturing complexity increases due to grinding operation constraints
Solution Approach 1:
The axially inner contact edge is segmented into two separate contact surfaces (first and second contact surfaces) divided by a relief groove. This segmentation allows each surface to be optimized independently for contact pressure distribution while enabling standardized grinding operations on each segment, resolving the contradiction between improved locking performance and manufacturing complexity
Solution Approach 2:
A relief groove is introduced as an intermediary feature between the two contact surfaces. This groove serves as a mediator that distributes contact pressure more evenly across the contact edge while providing a natural reference for grinding operations, thereby improving locking performance without significantly increasing manufacturing complexity
2Reliability
If the contact area ratio between axially outer and axially inner edges is reduced to improve pressure distribution, then locking efficiency improves, but the risk of grinding burns increases
Solution Approach 1:
By segmenting the contact edge into two surfaces with the relief groove, the grinding process can be optimized for each segment separately. This allows maintaining appropriate contact area ratios that improve pressure distribution while controlling the total material removal to prevent grinding burns
Solution Approach 2:
The contact edge geometry is modified by introducing the relief groove, which changes the distribution of contact area along the axial direction. This parameter change optimizes pressure distribution while the groove geometry can be controlled to maintain safe grinding parameters and avoid burns
Data Source
AI summary
A bearing unit having an axis of rotation (X) for a wheel hub assembly for motor vehicles includes stationary radially outer ring, a rotatable wheel hub or first radially inner ring, a rotatable second radially inner ring having an axially external first axial contact edge, an axially internal second axial contact edge having a radially external first contact surface configured to abut a surface of the first radially inner ring, a radially internal second contact surface, and a relief groove interposed radially between the first contact surface and the second contact surface, two rows of rolling bodies interposed between the radially outer ring and the second radially inner ring, and a joint including a bell, the second contact surface contacting a surface of the bell and axial locks the radially inner ring, and the relief groove reducing contact between the second contact edge and the surface of the bell.