Oil Seal Guide Member Design for Shaft Installation
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Solution Overview
Problem
Existing oil seals with funnel-shaped guides on the air side face challenges in shaft insertion, potentially damaging the shaft or seal due to insufficient inner diameters, and lack a mechanism to retain lubricant during installation.
Innovation Solution
A composite oil seal design featuring a funnel-shaped guide member with a larger diameter than the seal band, made from a stiff non-metallic material, which is separate from the seal body and provides a protective shipping plug to maintain lubricant integrity until installation, ensuring the guide is non-contact post-installation and using a flexible seal lip to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a guide member is added to guide shaft insertion, then shaft installation is facilitated and protection is improved, but device complexity increases
Solution Approach 1:
The guide member is integrated with the seal body to form a unified structure, where the guide member and seal body are molded as one piece. This merging approach provides shaft guidance functionality while maintaining seal integrity, facilitating shaft insertion, and avoiding the complexity of separate assembly components.
2Reliability
If the guide member diameter is larger than the seal band, then shaft guidance is improved and residual contact is eliminated, but manufacturing precision requirements increase
Solution Approach 1:
The guide member features a tapered configuration that transitions from a larger diameter at the outer end to a smaller diameter at the inner end. This curved/tapered geometry provides effective shaft guidance by gradually guiding the shaft into position while reducing stress concentration and minimizing the need for tight dimensional tolerances compared to a straight cylindrical guide.
3Reliability
If a shipping plug is added to retain lubricant, then seal protection is improved, but device complexity increases
Solution Approach 1:
The shipping plug is pre-installed in the guide member before seal assembly, creating a preliminary protective barrier. This preliminary action retains lubricant on the seal lip and protects the seal band during shipping and storage. The plug is designed to be easily removed during installation, providing protection when needed without complicating the final assembled state.
Data Source
AI summary
An oil seal having the usual lips for retaining oil and a guide member made of a variety of relatively stiff or rigid materials. The guide member is made slightly larger than the smallest diameter of the seal member when the seal rests on the shaft. The seal member can have the guide member on either the air side or the oil side of the seal. The disclosure also relates to a shipping plug, which is inserted into the seal and retains the oil in place during shipping when the seal is installed but a shaft is not installed.