Tone Ring Shielding Snap-Fit Axle Installation
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Solution Overview
Problem
Existing tone ring assembly systems in automotive vehicles are vulnerable to damage from axle shafts during installation, as they do not effectively shield the tone ring from impact forces, and previous designs fail to provide adequate protection or oil flow passages.
Innovation Solution
A snap-fit styled molded plastic shield with a circular ring cap, snap-fit arms, and pilot tabs is used to couple with the tone ring, creating a protective barrier that prevents direct contact with the axle shaft and allows oil flow, while the snap-fit arms and pilot tabs are arranged in concentric circles to enhance stability and attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tone ring assembly is installed without a shielding system, then the installation process is simpler and fewer components are used, but the tone ring is vulnerable to damage from axle shaft impact forces
Solution Approach 1:
The shield is designed to fit over the tone ring in a nested configuration, where the shield's central aperture accommodates the tone ring while the shield's outer diameter extends beyond the tone ring's outer diameter. This nesting arrangement provides protection without requiring a completely separate assembly process, as the shield is installed in conjunction with the tone ring already in place.
Solution Approach 2:
The shield is divided into multiple functional segments: a ring cap portion that provides the protective barrier, multiple snap-fit arms that provide attachment and positioning, and multiple pilot tabs that guide installation. This segmentation allows each component to perform its specific function while collectively providing comprehensive protection and ease of installation.
2Strength
If a shielding system with snap-fit arms is used to protect the tone ring, then the tone ring is protected from impact forces, but the assembly process becomes more complex
Solution Approach 1:
The snap-fit arms are designed to automatically engage with the tone ring's grooves without requiring additional fastening operations. The arms flex outward during installation and snap into place when the shield is properly positioned, providing self-securing functionality that eliminates the need for tools or additional assembly steps while ensuring reliable attachment.
Solution Approach 2:
The snap-fit arms are designed with flexibility to dynamically adapt during installation. They can flex outward to allow the shield to be positioned over the tone ring, then spring back to engage with the grooves, providing a dynamic installation process that is both protective and easeful.
3Stability of the object's composition
If pilot tabs are positioned behind snap-fit arms in concentric circles, then the shield prevents over-flexion and enhances stability, but the device complexity increases
Solution Approach 1:
The pilot tabs are positioned behind the snap-fit arms in concentric circular arrangements to provide preliminary guidance and support during the installation process. The pilot tabs engage with the tone ring first, establishing proper positioning and preventing over-flexion of the snap-fit arms before the arms fully engage, thereby simplifying the overall installation while enhancing stability.
4Reliability
If a solid shield structure is used to protect the tone ring, then maximum protection is provided, but oil flow passages are blocked
Solution Approach 1:
The shield structure implements local quality by having different regions serve different functions: the ring cap and snap-fit arms provide protective coverage where impact protection is needed, while the molding slides create localized openings that allow oil flow. This selective approach ensures protection effectiveness is maintained in critical areas while oil flow is preserved where required.
Solution Approach 2:
The shield incorporates porous-like structures through the molding slides, which are elongated openings that pass through the ring cap. These slides create a porous effect in the otherwise solid shield structure, allowing oil to flow through the shield while maintaining protective coverage. The slides are positioned and sized to provide adequate oil flow while preserving the shield's protective integrity.
Data Source
AI summary
A system is provided for shielding a tone ring assembly in automotive vehicles. The system comprises a ring cap with a central aperture, a plurality of molding slides circularly arranged on a first side of the ring cap, a plurality of snap-fit arms and a plurality of pilot tabs positioned on a second side of the ring cap, where the plurality of pilot tabs and the plurality of snap-fit arms are arranged in concentric circles with the snap-fit arms forming an outer circle and the pilot tabs forming an inner circle, and where each pilot tab of the plurality of pilot tabs is positioned directly behind a corresponding snap-fit arm of the plurality of snap-fit arms. In one example, the system prevents metal to metal contact between a tone ring and a shaft during axle shaft installation.