Hub Toothing via Collar Material Retention
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Solution Overview
Problem
The existing hub technology for wheel bearing units faces challenges in forming toothing without material escape during the cold forming process, leading to suboptimal load-bearing teeth formation due to radial material displacement.
Innovation Solution
The toothing is formed within the broken-out section of the collar material that is radially retained by the inner ring, ensuring the material flows into the tool dies and forms optimal load-bearing teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a sleeve-shaped auxiliary tool is used to prevent material from flowing away during toothing formation, then material retention is improved, but device complexity increases
Solution Approach 1:
The invention extracts the material retention function from a separate auxiliary tool and integrates it into the inner ring structure itself. The broken-out section with plastically displaced material creates an inherent retention mechanism that eliminates the need for external sleeve-shaped auxiliary tools, thereby reducing device complexity while maintaining material retention.
Solution Approach 2:
The invention merges the material retention function with the inner ring structure by creating a broken-out section that is filled with plastically displaced collar material. This integration combines the retention function into the existing component, eliminating the need for separate auxiliary tools and simplifying the overall device.
2Manufacturing precision
If the toothing is formed in material that is not retained, then material can escape radially outward, but the teeth are not optimally formed
Solution Approach 1:
The invention applies preliminary action by pre-forming the broken-out section and filling it with plastically displaced material before the toothing formation process. This preparatory step creates a retained material structure that prevents radial escape during subsequent toothing formation, ensuring optimal tooth formation quality.
Solution Approach 2:
The plastically displaced material in the broken-out section acts as an intermediary that retains the collar material during toothing formation. This intermediate structure prevents direct radial escape of material while allowing the forming tools to properly shape the teeth, thereby achieving optimal tooth formation.
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 approach allows for the formation of optimally shaped, load-bearing teeth without material loss, enhancing the rotational connection and reducing production complexity and costs.
Implementation Method 1
the broken-out section being filled with plastically displaced material of the collar
Implementation Method 2
The technology is preferably cold forming
Data Source
AI summary
A hub on a wheel bearing unit, which has at least one inner ring, sitting on the hub. The inner ring is axially retained on the hub by a collar, which has a toothing, formed from the hub. The inner ring has a radially inward broken-out section on the front face thereof and the broken-out section is filled with plastically displaced material from the collar such that the material of the inner ring at least engages in the broken-out section and the material in the broken-out section is enclosed in the radial direction by the inner ring.