Hub Sealing Device Sleeve Alignment
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Solution Overview
Problem
Conventional inboard dirt seals for wheel hubs often misalign during mounting, leading to oil leakage and dirt or water ingress, which can result in premature seal or bearing failure.
Innovation Solution
A sealing device comprising a radial shaft seal with a sleeve member that provides a coaxial alignment with the rolling bearing, featuring a press fit connection and a sleeve portion extending axially to surround the inner ring, along with a radial sealing lip and static seals to prevent misalignment and ensure optimal sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional inboard dirt seal is mounted in the wheel hub and then mounted on the spindle, then the sealing device can be installed, but the seal may easily misalign during mounting, causing oil leakage and dirt or water ingress
Solution Approach 1:
The sleeve member is pre-mounted on the spindle with an inner static sealing surface that provides a guided interface. This preliminary action ensures that when the radial shaft seal is subsequently installed, it is guided into proper alignment by the sleeve member, preventing misalignment during the mounting process and ensuring reliable sealing performance
Solution Approach 2:
The sleeve member acts as an intermediary component between the spindle and the radial shaft seal. It provides a guided interface with its inner static sealing surface that mediates the connection, ensuring proper alignment and positioning of the seal while allowing the seal to perform its sealing function effectively
2Manufacturing precision
If the sleeve member extends axially beyond the side surface to surround the inner ring, then coaxial alignment is ensured, but the device complexity increases
Solution Approach 1:
The sleeve member is designed to perform multiple functions: it provides coaxial alignment guidance, acts as a mounting interface for the radial shaft seal, and extends axially to surround the inner ring of the rolling bearing. By combining these functions into a single component, the design achieves precise alignment without proportionally increasing overall device complexity
Solution Approach 2:
The sleeve member extends in the axial dimension beyond the side surface to surround the inner ring of the rolling bearing. This axial extension provides the necessary guidance for coaxial alignment while maintaining a compact radial profile, effectively using the axial dimension to solve the alignment problem without significantly increasing overall structural complexity
Data Source
AI summary
A sealing device is provided for sealing a space between a hub and a spindle pivotally connected by a bearing, the hub being coaxially mounted on the spindle and extending in an axial direction and the bearing having an inner ring. The sealing device includes a radial shaft seal including a shell portion having an outer static sealing surface disposeable against the hub and a hinge portion having a radial sealing lip. A sleeve member includes an inner static sealing surface disposeable against the spindle, a running surface contactable by the sealing lip and a sleeve portion. The sleeve portion extends in the axial direction beyond a side surface of the bearing inner ring and is disposeable about a shoulder diameter of the bearing inner ring.