Conductive Shaft Seal Assembly for EMI and Corrosion Suppression
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Solution Overview
Problem
Existing sealing devices fail to reliably ensure electrical conduction between a rotation shaft and a housing, leading to electromagnetic wave noise and electrolytic corrosion, while requiring additional space and generating abrasion powder.
Innovation Solution
A sealing device with a conductive lip and a metal ring that forms a conductive path between the rotation shaft and the housing, ensuring electrical conduction through a conductive lip and a metal ring, reducing electrical resistance, and eliminating the need for a dedicated ground brush.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive lip is used to ensure electrical conduction, then electromagnetic wave noise and electrolytic corrosion are suppressed, but electrical conduction reliability is insufficient
Solution Approach 1:
The invention merges the sealing function and electrical conduction function into a single integrated sealing device. The lip portion simultaneously provides dust sealing and electrical conduction, while the metal ring provides both structural support and electrical conduction path to the housing, eliminating the need for separate ground brushes
Solution Approach 2:
The sealing device uses composite material structure combining a rubber or polymer lip portion with a metal ring. The lip portion can be made of conductive rubber or polymer composite material, while the metal ring provides high electrical conductivity and mechanical strength, creating a composite structure that achieves both sealing and reliable electrical conduction
2Reliability
If a dedicated ground brush is used to ensure electrical conduction, then the rotation shaft is grounded to the housing, but additional space is required and brush abrasion powder is generated
Solution Approach 1:
The invention extracts the electrical conduction function from the separate ground brush component and integrates it into the sealing device itself. The sealing device now performs both sealing and electrical conduction functions, eliminating the need for dedicated ground brushes and their associated problems
Solution Approach 2:
The sealing device is designed with multi-functionality, simultaneously providing dust sealing and electrical conduction. The lip portion contacts the rotation shaft for sealing while also providing electrical conduction, and the metal ring contacts the housing to complete the ground path, making the sealing device a universal component that replaces both seal and ground brush
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 sealing device effectively suppresses electromagnetic wave noise and electrolytic corrosion, ensuring reliable electrical conduction without additional space or abrasion powder, while maintaining dust sealing performance.
Implementation Method 1
a second lip portion disposed on an inner side of the first lip portion in the housing; and a metal ring holding the second lip portion, wherein the second lip portion is a conductive lip constituted by a conductive material
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A sealing device (100) is a sealing device (100) that is disposed in a gap (320) between an outer peripheral surface (210) of a rotation shaft (200) and an inner peripheral surface (310) of a shaft hole (301) in a housing (300) having the shaft hole (301) into which the rotation shaft (200) is inserted to seal the gap (320), the sealing device (100) including: a first lip portion (23); a second lip portion disposed on an inner side (330) of the first lip portion (23) in the housing (300); and a metal ring (70) holding the second lip portion, wherein the second lip portion is a conductive lip (50) constituted by a conductive material, the metal ring (70) includes an abutting portion (70a) abutting on the housing (300), and an inward extending portion (70b) extending radially inward from the abutting portion (70a) and holding the conductive lip (50).