Labyrinth Sealing Ring Structure for Wheel Hub Contaminant Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sealing structures between vehicle wheel hubs and axles fail to meet stringent sealing requirements, particularly in harsh environments, leading to reduced wheel life and performance.
Innovation Solution
A sealing structure comprising an inner sealing ring with stepped portions and an outer sealing ring with an annular groove and sealing lips, forming a complex labyrinth to prevent contaminant entry, suitable for high rotational speeds and harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing structures with two components (outer seal and inner seal) are used, then the basic sealing function is provided, but the sealing performance is insufficient for harsh environments and high rotational speeds
Solution Approach 1:
The inner sealing ring is divided into two stepped portions (first stepped portion and second stepped portion) with different functions. The first stepped portion interacts with the annular groove of the outer sealing ring, while the second stepped portion provides additional sealing contact, creating a segmented sealing approach that improves performance without requiring completely separate inner and outer seal components
Solution Approach 2:
The sealing structure utilizes axial dimension by creating stepped portions at different axial levels. The first stepped portion is located at a lower axial level within the annular groove, while the second stepped portion extends to a higher axial level, providing multi-level sealing contact that enhances sealing performance in the axial direction
2Reliability
If the structural design and fitting relationship of inner and outer seals are not optimized, then manufacturing is simpler, but sealing requirements for 1400-hour mud test cannot be met
Solution Approach 1:
Different portions of the inner sealing ring are designed with different geometries to fulfill specific sealing functions. The first stepped portion has a geometry optimized for interaction with the annular groove, while the second stepped portion has a different geometry for additional sealing contact, allowing each local region to be optimized for its specific sealing requirement
Solution Approach 2:
The first stepped portion of the inner sealing ring is nested within the annular groove of the outer sealing ring, creating a nested configuration that ensures precise fitting relationship. This nested arrangement naturally guides the components into proper alignment during assembly, reducing the need for high-precision manual fitting
3Object-affected harmful factors
If sealing lips are added at key locations, then contaminant prevention is enhanced, but the device complexity increases
Solution Approach 1:
The sealing lip acts as an intermediary element between the first stepped portion and the external environment. It provides an additional sealing interface that intercepts contaminants before they can reach the critical internal components, enhancing protection without requiring a complete redesign of the sealing system
Solution Approach 2:
The sealing lip is positioned to provide preliminary sealing action against contaminants before they can penetrate deeper into the sealing structure. By placing the sealing lip at the outer side of the first side wall, it creates the first line of defense that prevents contaminant entry in advance
Data Source
AI summary
A sealing structure includes an inner sealing ring with a first stepped portion having an L-shaped cross section and a second stepped portion having an L-shaped cross section, the first stepped portion being connected to the second stepped portion and an outer sealing ring having a circumferential annular groove with an axially extending first side wall and an axially extending second side wall. The first stepped portion of the inner sealing ring is located in the annular groove of the outer sealing ring, the second stepped portion of the inner sealing ring is located axially adjacent to the first side wall of the outer sealing ring, and a radially outer side of the first side wall of the outer sealing ring includes at least one sealing lip.