Conductive Seal Structure for Stable Grounding and Noise Reduction
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Solution Overview
Problem
Conventional electromagnetic noise reduction devices in electrified vehicles experience degradation in electrical conductivity performance over time, failing to effectively dissipate noise to the housing.
Innovation Solution
A sealing apparatus with conductive grease housed between an outer and inner seal part, featuring conductive elastic bodies with protrusions and a conduction lip with a wedge-shaped cross-section, and a spring to maintain contact and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional electromagnetic noise reduction devices are used, then space is saved, but electrical conductivity performance degrades over time
Solution Approach 1:
The patent introduces conductive grease as an intermediary substance between the inner and outer elastic body parts. This grease fills the space between components and maintains electrical conductivity through its conductive properties, preventing the degradation that occurs in conventional direct-contact designs while preserving compact dimensions.
Solution Approach 2:
The patent changes the physical state and material properties of the conductive path by using conductive grease instead of solid conductive materials. This parameter change allows the system to maintain low electrical resistance over time while keeping the device compact, as the grease can flow and adapt to maintain optimal contact.
2Reliability
If metallic brush is used for grounding, then electrical conductivity is achieved, but metallic powder is generated causing safety issues
Solution Approach 1:
The patent replaces the mechanical sliding contact system (metallic brush) with an elastic body system that uses elastic deformation for contact. This substitution eliminates the generation of metallic powder while maintaining electrical conductivity, as the elastic bodies deform rather than wear down like metallic brushes.
Solution Approach 2:
The patent uses composite elastic body parts that combine elastic material with conductive properties. These composite materials provide both the mechanical flexibility needed for reliable contact and the electrical conductivity required for grounding, without the harmful byproducts of metallic brush systems.
3Reliability
If sliding movement occurs between shaft and metallic brush, then grounding is achieved, but metallic powder flies requiring additional safety components
Solution Approach 1:
The patent replaces the sliding mechanical contact of metallic brushes with elastic bodies that make stationary contact through elastic deformation. This eliminates the sliding movement that generates flying metallic powder, removing the need for additional protective covers and simplifying the overall device structure.
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 apparatus maintains stable electrical conductivity and noise reduction by forming a low-resistance conductive path, preventing noise generation and degradation even after long-term use.
Implementation Method 1
conductive grease is housed in the space formed by the outer seal part and the inner seal part
Implementation Method 2
an inner elastic body part and an outer elastic body part which are formed of an elastic body having electrical conductivity
Implementation Method 3
a spring to maintain contact and conductivity
Data Source
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AI summary
Provided is a sealing apparatus capable of inhibiting a degradation in electrical conductivity performance. A sealing apparatus includes an outer seal part and an inner seal part, and conductive grease housed in a space . An outer elastic body part of the outer seal part is formed from an elastic body having electrical conductivity and includes a dust lip, a conduction lip , and a gasket part. At an annular fitting surface, the inner seal part is attached to the outer seal part. An inner elastic body part of the inner seal part is formed from an elastic body having electrical conductivity and includes a grease lip. The outer seal part has a spring that is put on an outer periphery side of the conduction lip to press the conduction lip against an inner peripheral member.