Oil Seal Funnel Guide for Damage-Free Shaft Insertion
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Solution Overview
Problem
Existing oil seals lack effective guides for shaft insertion, particularly from the air side, which can cause damage to the shaft or seal during installation, and often result in residual contact that may lead to friction and contamination issues.
Innovation Solution
A funnel-shaped guide member with a larger diameter than the seal band, made from a non-metallic material like plastic, is integrated into the oil seal, providing a flexible and protective installation guide that remains non-contact with the shaft post-installation, and includes a shipping plug to retain lubricant until installation is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a funnel-shaped guide member is provided on the air side of the seal, then shaft insertion is facilitated, but the innermost diameter of the guide member may contact and damage the shaft or seal band
Solution Approach 1:
The guide member acts as an intermediary component between the shaft and the seal assembly. It provides a tapered surface that gradually guides the shaft into position, preventing sudden contact forces that could damage the seal band or shaft. The guide member's larger diameter at the air side transitions to a smaller diameter near the seal band, creating a controlled insertion path.
Solution Approach 2:
Instead of providing the guide member on the oil side of the seal, the invention places it on the air side. This inversion allows the guide member to perform its guiding function before the shaft contacts the seal band, preventing damage while still facilitating insertion. The guide member's innermost diameter is positioned away from direct contact with the seal band during normal operation.
2Ease of operation
If the guide member innermost diameter is reduced to improve shaft insertion, then insertion ease increases, but the risk of damage to shaft or seal during insertion increases
Solution Approach 1:
The guide member exhibits varying diameter along its length, with the largest diameter at the air side providing initial guidance and progressively smaller diameters toward the seal band. This local variation in geometry allows the guide to accommodate the shaft during insertion while preventing excessive contact forces at critical areas. The seal band diameter remains distinct from the guide member's smallest diameter to avoid contact.
3Object-affected harmful factors
If the seal band diameter is made smaller than the guide member innermost diameter to prevent contact, then damage prevention is improved, but shaft insertion alignment may be compromised
Solution Approach 1:
The guide member performs the alignment function preliminarily, before the shaft contacts the seal band. The tapered geometry of the guide member gradually centers the shaft as it is inserted from the air side, ensuring proper alignment is achieved before the shaft reaches the seal band region. This preliminary alignment action prevents misalignment issues that could arise from the seal band being smaller than the guide member's innermost diameter.
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.