Split-Lip Sealing Ring Layout for Heat-Stable Conductive Contact
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Solution Overview
Problem
Existing sealing devices for motor applications face challenges in preventing deterioration due to heat generation, which affects their sealing performance and electroconductive properties, especially when in contact with high-speed rotating shafts.
Innovation Solution
A sealing device comprising a metal retaining ring, a seal lip, and an electroconductive lip, both annular in shape, are spaced apart to prevent heat-induced deterioration. The seal lip and electroconductive lip are designed with oblique extensions and fixed portions to maintain contact with the inner-peripheral-side member, forming a non-overlapping configuration that reduces sliding heat generation and enhances electroconductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member made of electroconductive rubber is used to seal the gap between the housing and rotational shaft, then electromagnetic noise can be suppressed and space can be saved, but heat generation from contact with the high-speed rotating shaft deteriorates the seal member and reduces electroconductive performance
Solution Approach 1:
The sealing device is divided into two separate lips: a seal lip for sealing contact and an electroconductive lip for electroconductive contact. This segmentation allows each component to perform its specific function without suffering from the adverse effects of the other, thereby preventing heat generation from deteriorating electroconductive performance while maintaining effective noise suppression
Solution Approach 2:
Different portions of the sealing device have different properties: the seal lip is optimized for sealing contact with the rotating shaft, while the electroconductive lip is optimized for maintaining electroconductive contact with the housing. This local differentiation ensures that heat generation from sealing contact does not affect the electroconductive properties where needed
2Volume of moving object
If the seal lip and electroconductive lip are positioned close together to save space, then the device size is reduced, but heat generation from the seal lip can deteriorate the electroconductive lip
Solution Approach 1:
The seal lip and electroconductive lip are arranged in the axial direction (another dimension) rather than being positioned close together radially. This spatial arrangement in a different dimension allows both lips to perform their functions effectively while maintaining adequate spacing to prevent heat transfer from the seal lip to the electroconductive lip
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 prevents deterioration of sealing performance and electroconductivity, maintaining effective noise suppression and sealing efficiency by reducing sliding heat generation and maintaining a stable electroconductive path between the inner and outer-peripheral-side members.
Implementation Method 1
an electroconductive lip having electroconductivity, having an annular shape around the axis, and fixed, on an outer peripheral side, to the retaining ring
Implementation Method 2
the seal lip and the electroconductive lip are spaced from each other in a direction of the axis, at least at the seal portion and the contact point portion
Data Source
AI summary
A sealing device includes a metal retaining ring annular around an axis, a seal lip annular around the axis, and an electroconductive lip annular around the axis. The seal lip is fixed, on an outer peripheral side, to the retaining ring. The seal lip includes a seal extending obliquely relative to the axis, forming an end on an inner peripheral side, and including a first inner peripheral surface. The first inner peripheral surface contacts an inner-peripheral-side member. The electroconductive lip is fixed, on an outer peripheral side, to the retaining ring. The electroconductive lip includes a contact point extending obliquely relative to the axis, forming an end on an inner peripheral side, and including a second inner peripheral surface. The second inner peripheral surface contacts the inner-peripheral-side member. The seal lip and the electroconductive lip are spaced from each other at least at the seal and the contact point.