Wheel Hub Shield Coupling for Axial Stability
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Solution Overview
Problem
The existing coupling systems for sealing assemblies in wheel hub units suffer from axial movement of the shield on the flanged hub due to wheel deflection, leading to increased friction and potential damage, especially when the vehicle navigates bends.
Innovation Solution
A low-friction coupling system is introduced, featuring a first annular shield with an elastically deformable sleeve portion and a second annular shield with sealing lips, where the sleeve portion is axially locked using a cylindrical interference-fit and shallow recess design, preventing movement and maintaining seal integrity during flange deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the shield is mounted close to the wheel support flange, then the sealing assembly can be compact and efficient, but the shield moves axially due to flange deflection, increasing friction and causing potential damage
Solution Approach 1:
The shield is divided into two functional parts: a stationary mounting portion attached to the hub and a rotating sealing portion that can rotate independently. This segmentation allows the sealing lips to maintain contact with the rotating seal race while the mounting portion remains fixed, preventing axial movement and friction increase during flange deflection
Solution Approach 2:
A low-friction coating layer is applied to the sealing lips and seal surfaces to reduce friction and wear. This intermediary layer acts as a mediator between the sealing surfaces, allowing relative movement without generating excessive friction or heat, thereby preventing damage while maintaining sealing effectiveness
2Reliability
If the sealing lips increase interference to improve sealing, then sealing performance improves, but friction increases and potential damage occurs
Solution Approach 1:
The friction coefficient of the sealing surfaces is changed by applying low-friction coatings such as PTFE, graphite, or diamond-like carbon. This parameter change allows the sealing lips to maintain necessary interference for effective sealing while generating significantly reduced friction, preventing overheating and damage
Solution Approach 2:
The sealing assembly uses composite construction with sealing lips made of elastomeric materials coated with low-friction layers, and seal races with matching low-friction surfaces. This composite approach combines the sealing capability of elastomers with the low-friction properties of specialized coatings, achieving both good sealing and low friction
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 system effectively reduces friction and prevents damage by stabilizing the shield's position, ensuring consistent sealing performance even under flange deformation, while being cost-effective and easy to manufacture.
Implementation Method 1
a first annular shield (10) having a sleeve portion (15) intended in use to be coupled integrally with a rotating annular element (4), wherein the sleeve portion (15) is delimited by a lateral mounting surface (21) towards the rotating annular element (4) having cylindrical geometry with a diameter (φm) of constant size along an axis (A)
Data Source
AI summary
A coupling system for a sealing assembly with a rotating annular member. In particular, a bearing ring provided with a flange. The sealing assembly provides at least one first annular shield having a sleeve portion integrally coupled with the rotating annular member and a flange portion that radially and overhangingly protrudes from the sleeve portion and is arranged close to the flange. The sleeve portion is defined by a solid tubular body of rotation delimited by a mounting surface facing towards the rotating annular member and having cylindrical geometry, In combination, the sleeve portion couples with an assembly seat of the rotating annular member, formed by an annular shallow recess delimited by a cylindrical bottom surface and by an axial shoulder arranged on the side opposite to the flange; the first annular shield being placed, at the same time, in axial contact with the flange portion and the axial shoulder.