Wheel Hub Sealing Device with L-Shaped Support
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Solution Overview
Problem
Existing sealing devices for wheel hub assemblies connected to constant-velocity joints do not adequately prevent liquid and contaminant infiltration and require an uneconomical production process.
Innovation Solution
A sealing device comprising two shields with L-shaped sleeve and flange portions, an annular sealing element with magnetizable synthetic plastic or elastomer material for signal generation, and a tubular support with an L-shaped edge, integrated with an annular step and elastomer gasket to create a fluid-tight seal, ensuring protection without increasing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sealing device with an annular insert extending axially projecting above an annular step is used, then signal generation capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the signal generating function from a complex integrated structure and implements it through a simple annular insert that can be separately manufactured and mounted. This insert is made of magnetizable material and can be attached to the flange portion using conventional techniques such as adhesive bonding, mechanical fastening, or magnetic attachment, thereby achieving signal generation capability without increasing manufacturing complexity
Solution Approach 2:
The annular insert serves multiple functions: it acts as both a sealing element in the labyrinth seal configuration and a signal generating element for rotational speed detection. This multi-functionality eliminates the need for separate components, reducing overall manufacturing complexity while maintaining signal generation capability
2Reliability
If a complex sealing structure with multiple assemblies is used, then sealing performance is improved, but manufacturing cost increases
Solution Approach 1:
The sealing device is segmented into two independent sealing assemblies: a first sealing assembly arranged between the inner ring and outer ring of the wheel hub, and a second sealing assembly mounted on the inner ring that straddles the wheel hub and constant-velocity joint. This segmentation allows each assembly to be optimized and manufactured separately using conventional processes, reducing overall manufacturing cost while maintaining high sealing performance
Solution Approach 2:
The patent introduces an intermediary elastomer gasket in the second sealing assembly that provides the primary sealing function against liquids and contaminants. This gasket is mounted on the tubular support and engages with the L-shaped folded edge, creating an effective seal without requiring complex machining or specialized materials, thereby reducing manufacturing cost while maintaining reliability
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 sealing device effectively prevents liquid and contaminant infiltration while being easy to manufacture and cost-effective, maintaining high protection standards for wheel hub assemblies.
Implementation Method 1
an annular sealing element (19) mounted on the flange portion (17, 117) and comprising a magnetizable synthetic plastic or elastomer material
Data Source
AI summary
A sealing device for wheel hubs connected to constant-velocity joints including a first sealing assembly arranged between inner and outer rings of the wheel hub, and a second sealing assembly mounted on the inner ring and straddling the wheel hub and an outer ring of the constant-velocity joint. The first sealing assembly has a signal generating element having an annular insert mounted externally on a shield facing the constant-velocity joint and extending axially projecting above part of an annular step formed, on the same side as the constant-velocity joint, on a radially outer side surface of the inner ring, in a position immediately adjacent to the sleeve portion of the first shield. The second sealing assembly includes a tubular support keyed onto the inner ring by its first end on the outside edge folded in the manner of an L and shaped to engage inside the annular insert.