Annular Conductive Seal Structure for Contamination-Resistant EMI Diversion
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Solution Overview
Problem
Conductive structural bodies used to divert electromagnetic noise in electric vehicles suffer from decreased conductivity due to exposure to foreign matter such as mud, water, and dust, limiting their effectiveness.
Innovation Solution
A conductive structural body with a closure member and a conductive path member forming a sealing structure in an annular gap, integrated with a seal lip and side lip to prevent foreign matter entry, while maintaining conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conductive structural body is provided without a sealing mechanism, then the structure is simple and easy to manufacture, but the conductivity decreases due to exposure to foreign matter such as mud water, rainwater, and dust
Solution Approach 1:
The conductive structural body is divided into multiple segments including a first conductive member, a second conductive member, and an intermediate member. This segmentation allows each component to be optimized independently - the conductive members maintain electrical conductivity while the intermediate member provides sealing functionality, resolving the contradiction between manufacturing simplicity and conductivity reliability.
Solution Approach 2:
The patent employs composite material structure where conductive materials (for electrical conductivity) are combined with sealing materials (for protecting against foreign matter). The conductive structural body integrates conductive members with sealing members, creating a composite structure that simultaneously achieves both high conductivity and protection from environmental factors like mud water and dust.
2Reliability
If a conductive structural body is surrounded by a casing to suppress contact with foreign matter, then conductivity is maintained, but the application scope is limited
Solution Approach 1:
The patent extracts the sealing function from a separate casing structure and integrates it directly into the conductive structural body itself. The sealing members are built-in components that form sealing surfaces with the conductive members, eliminating the need for external casings and thereby expanding application scope while maintaining conductivity reliability.
Solution Approach 2:
The conductive structural body is designed to perform multiple functions simultaneously: it provides electrical conductivity through the conductive members, sealing protection through the sealing members, and mechanical support. This multi-functionality allows the same structure to be applied in various environments without requiring additional protective casings, thus enhancing adaptability.
3Reliability
If a sealing structure is added to protect the conductive path member, then conductivity is maintained when exposed to foreign matter, but the device complexity increases
Solution Approach 1:
The patent merges the sealing function with the conductive structural body by integrating sealing members directly with the conductive members. The sealing members are positioned between the first and second conductive members, forming a unified structure where sealing and conduction are combined rather than separate, thus reducing overall device complexity while maintaining conductivity.
Solution Approach 2:
The sealing members are designed as flexible components that can deform to accommodate the conductive members and maintain sealing effectiveness. This flexibility allows the sealing structure to adapt to manufacturing tolerances and operational variations without requiring complex rigid sealing mechanisms, thereby keeping the overall structure simple.
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 effectively suppresses the decrease in conductivity even when exposed to foreign matter, ensuring effective noise diversion and structural integrity.
Implementation Method 1
a seal lip that is annular around the axis line and formed of an elastic material... the seal lip is configured to contact the shaft to seal a sealing target object
Implementation Method 2
a side lip that is annular around the axis line and formed of an elastic material... the side lip extends toward a side opposite to the seal lip in a direction of the axis line and is configured to contact the shaft to prevent entry of foreign matter from the opposite side
Implementation Method 3
a conductive path member that is annular around the axis line and forms the conductive path... forms a conductive path between the rotation shaft and the housing, thereby diverting electromagnetic noise from the rotation shaft to the housing
Data Source
AI summary
A conductive structural body is a conductive structural body that forms a conductive path in an annular gap. The conductive structural body includes a closure member that is annular around an axis line x and closes a gap, and a conductive path member that is annular around the axis line x and forms a conductive path. The conductive path member penetrates the closure member in a radial direction.