Plastic Sensor-Carrier Cap Snap Locking Wheel Hub Bearing
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Solution Overview
Problem
Existing sensor-carrier caps for wheel hub bearings face increased production costs and bimetallic issues due to metal reinforcement, which also complicates mounting reliability.
Innovation Solution
A plastic sensor-carrier cap without conventional metal reinforcement, utilizing snap locking means integral with the cylindrical wall to securely attach to the outer ring of the hub-bearing assembly, eliminating the need for metal inserts and ensuring reliable mounting through radial interference and snap locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal reinforcement is added to the plastic cap, then the mechanical strength and stiffness of the cap are improved, but the production cost increases and bimetallic problems occur
Solution Approach 1:
The invention extracts and removes the metal reinforcement component from the cap structure, replacing it with an integral plastic design that achieves the required strength through optimized geometry and material properties alone, thereby eliminating bimetallic issues and reducing production costs
Solution Approach 2:
The invention uses composite material properties by combining the plastic material with specific structural features (such as rib reinforcements and geometric optimizations) to achieve the mechanical strength previously only attainable with metal inserts, creating a homogenous plastic component that avoids bimetallic problems
2Stability of the object's composition
If metal reinforcement is embedded in the plastic wall, then the structural stability is improved, but the device complexity and manufacturing complexity increase
Solution Approach 1:
The invention merges the reinforcement function directly into the plastic wall structure by creating integral rib features and geometric optimizations during the molding process, eliminating the need for separate metal reinforcement components and their associated assembly steps
Solution Approach 2:
The invention changes the structural parameters of the plastic wall by optimizing wall thickness distribution, adding rib reinforcements, and modifying the geometric configuration to achieve the required structural stability without metal inserts, thereby simplifying the overall device
3Reliability
If conventional metal reinforcement is used, then the cap can be mounted in the wheel hub, but bimetallic contact problems occur with the outer ring
Solution Approach 1:
The invention extracts and removes all metallic components from the cap structure, creating a completely plastic solution that eliminates bimetallic contact between the cap and the outer ring of the wheel hub assembly
Solution Approach 2:
The invention achieves homogeneity by using the same plastic material throughout the entire cap structure, including the mounting interface, ensuring uniform material properties and eliminating bimetallic incompatibility issues with the aluminum outer ring
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
The solution provides a cost-effective and reliable mounting system for sensor-carrier caps, eliminating axial play and bimetallic issues, while maintaining stability and accuracy in attachment to the wheel hub bearing.
Implementation Method 1
The cap is mounted in the wheel hub assembly by interference between the interface wall and an outer ring of the wheel hub assembly
Data Source
Figure 1~2
Figure 3
AI summary
A sensor-carrier cap (30) for a bearing of a wheel hub, the cap being made of plastic material and having: - a bottom wall (31) arranged transversely to a central axis (A) and providing a seat (31) for accommodating a sensor, - a cylindrical mounting wall (32) extending axially from one side of the bottom wall (31) around the axis (A); - snap locking means (37b, 39) projecting in a radially outer direction from the cylindrical wall (32), for locking the sensor-carrier cap on a tubular appendage (23) of a wheel hub-bearing.