Double-Ring Split Oil Seal for Vibration-Stable Cut Closure
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Solution Overview
Problem
Existing split oil seals face challenges with inconvenient mounting and removal, and they suffer from reduced sealing performance due to loosening of cuts under conditions of large vibrations and swings, impacting safety and reliability.
Innovation Solution
A split oil seal composed of double springs and double rings, featuring an elastic outer and inner ring with radial and circumferential forcing elements, including a radial forcing element like a finger spring and a circumferential forcing element like a shaft type spring, which enhance closing forces and prevent loosening of cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a split structure is adopted for convenient mounting and removal, then the ease of operation is improved, but the reliability deteriorates due to loosening of cuts under vibration
Solution Approach 1:
The oil seal is divided into two separate rings (inner ring and outer ring) that can be independently assembled and disassembled. The inner ring contains the sealing lip and can be removed separately from the outer ring through the cut, enabling convenient maintenance without removing the entire seal assembly.
Solution Approach 2:
Radial forcing elements (springs) are pre-installed between the inner and outer rings to continuously apply closing force on the cuts before any loosening can occur. This preliminary action ensures that the cuts remain tightly closed even under vibration and swing conditions, preventing dislocation and maintaining sealing performance.
2Ease of operation
If cutting is provided at the split portion for flexible removal, then the ease of operation is improved, but the reliability deteriorates due to dislocation and loosening under violent shaft movement
Solution Approach 1:
The outer ring is cut to create a split structure that allows the inner ring to be independently removed. This segmentation enables flexible maintenance operations while the spring forcing elements maintain tight closure of the cut portions during normal operation, preventing dislocation even under violent shaft movement.
Solution Approach 2:
Radial forcing springs are pre-positioned to continuously apply closing force on the cut surfaces of both inner and outer rings before any loosening can occur. This preliminary action ensures that the cuts remain tightly closed even under vibration and swing conditions, preventing dislocation and maintaining sealing performance.
3Device complexity
If a single spring is used for forcing, then the device complexity is reduced, but the reliability deteriorates due to insufficient closing force under vibration
Solution Approach 1:
Multiple radial forcing springs are combined and arranged between the inner and outer rings to work together in providing closing force. This merging of multiple spring elements creates a more robust and reliable closing force system that can withstand vibration and swing conditions while maintaining relatively simple device complexity.
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 solution improves sealing performance by preventing loosening of cuts, ensuring safety, reliability, and durability under vibration and swing conditions, while facilitating convenient mounting and removal.
Implementation Method 1
a radial forcing element (e.g. finger spring)
Implementation Method 2
a circumferential forcing element (e.g. shaft type spring)
Data Source
AI summary
A split oil seal composed of double springs and double rings comprises an elastic outer ring intended to be statically mounted in a cavity outside a bearing box or gear box, and an elastic inner ring intended to be sleeved on a shaft of the device and held by the outer ring. The outer ring has an outer ring cut and the inner ring has an inner ring cut. The split oil seal further comprises a radial forcing element and a circumferential forcing element, wherein the radial forcing element exerts tension in both directions directed to outer circumferences and inner centers of both the outer ring and the inner ring in radial directions thereof, and the circumferential forcing element exerts a circumferential closing force to the inner ring. By using the split oil seal composed of double springs and double rings of the present invention, the advantages of convenient mounting and removal as well as strong anti-disengaging ability are achieved.